UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC  20549


                                    FORM 10-Q


                                   (MARK ONE)

           [X] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE

                         SECURITIES EXCHANGE ACT OF 1934


                  For the quarterly period ended: JUNE 30, 2001

                                       OR


          [ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE

                         SECURITIES EXCHANGE ACT OF 1934


               For the transition period from _______ to ________

                        Commission File Number:  0-30235


                                 EXELIXIS, INC.
             (Exact name of registrant as specified in its charter)

                Delaware                       04-3257395
     (State or other jurisdiction of        (I.R.S.  Employer
     incorporation  or  organization)     Identification  Number)

                                 170 Harbor Way
                                  P.O. Box 511
                          South San Francisco, CA 94083
          (Address of principal executive offices, including zip code)
                                  (650) 837-7000
              (Registrant's telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding  12  months  (or  for such shorter period that the registrant was
required  to  file  such  reports),  and  (2)  has  been  subject to such filing
requirements  for  the  past  90  days:

     Yes  [X]     No  [  ]


As  of  July  31,  2001, there were 49,161,649 shares of the registrant's common
stock  outstanding.


EXELIXIS, INC. FORM 10-Q INDEX PART I. FINANCIAL INFORMATION Page No. Item 1. Consolidated Financial Statements Consolidated Condensed Balance Sheets June 30, 2001 and December 31, 2000 3 Consolidated Condensed Statements of Operations Three and Six Months ended June 30, 2001 and 2000 4 Consolidated Condensed Statements of Cash Flows Six Months ended June 30, 2001 and 2000 5 Notes to Consolidated Condensed Financial Statements 6 Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations 11 Item 3. Quantitative and Qualitative Disclosures About Market Risk 16 PART II. OTHER INFORMATION Item 2. Changes in Securities and Use of Proceeds 17 Item 4. Submission of Matters to a Vote of Security Holders 18 Item 5. Other Information - Risk Factors 19 Item 6. Exhibits and Reports on Form 8-K 30 SIGNATURE

PART I. FINANCIAL INFORMATION Item 1. Consolidated Financial Statements EXELIXIS, INC. CONSOLIDATED CONDENSED BALANCE SHEETS (IN THOUSANDS) JUNE 30, DECEMBER 31, 2001 2000 (1) ---------- -------------- (unaudited) ASSETS Current assets: Cash and cash equivalents $ 46,063 $ 19,552 Short-term investments 76,990 93,000 Other receivables 2,689 1,493 Inventories - 3,612 Other current assets 2,791 1,987 ---------- -------------- Total current assets 128,533 119,644 Property and equipment, net 35,639 23,480 Related party receivables 993 494 Goodwill and other intangibles, net 68,851 58,674 Other assets 4,503 2,622 ---------- -------------- Total assets $ 238,519 $ 204,914 ========== ============== LIABILITIES AND STOCKHOLDERS' EQUITY Current liabilities: Accounts payable and accrued expenses $ 11,304 $ 10,050 Line of credit - 1,484 Current portion of capital lease obligations 5,750 3,826 Current portion of notes payable 3,539 1,664 Advances from minority shareholders - 868 Deferred revenue 6,463 6,233 ---------- -------------- Total current liabilities 27,056 24,125 Capital lease obligations 8,778 6,341 Notes payable 1,128 1,635 Convertible promissory note 30,000 - Minority interest in consolidated subsidiary - 1,044 Other long-term liabilities 200 - Deferred revenue 17,831 9,036 ---------- -------------- Total liabilities 84,993 42,180 ---------- -------------- Stockholders' equity: Common stock 50 47 Additional paid-in-capital 328,008 304,339 Notes receivable from stockholders (1,701) (1,805) Deferred stock compensation, net (6,800) (10,174) Accumulated other comprehensive income 434 365 Accumulated deficit (166,465) (130,038) ---------- -------------- Total stockholders' equity 153,526 162,734 ---------- -------------- Total liabilities and stockholders' equity $ 238,519 $ 204,914 ========== ============== (1) The consolidated condensed balance sheet at December 31, 2000 has been derived from the audited financial statement at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. The accompanying notes are an integral part of these consolidated condensed financial statements.

EXELIXIS, INC. CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS) (unaudited) THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, --------------------------- ------------------------- 2001 2000 2001 2000 --------- --------- --------- --------- Revenues: License $ 924 $ 932 $ 1,848 $ 1,864 Contract and government grants 7,627 4,684 14,437 9,703 --------- --------- --------- --------- Total revenues 8,551 5,616 16,285 11,567 --------- --------- --------- --------- Operating expenses: Research and development (1) 20,555 13,365 37,370 22,299 General and administrative (2) 4,976 4,921 9,236 9,216 Amortization of goodwill and intangibles 1,226 - 2,276 - Acquired in-process research and development 6,673 - 6,673 - --------- --------- --------- --------- Total operating expenses 33,430 18,286 55,555 31,515 --------- --------- --------- --------- Loss from operations (24,879) (12,670) (39,270) (19,948) Other income (expense): Interest and other income 1,597 1,866 3,492 2,014 Interest expense (426) (168) (649) (326) --------- --------- --------- --------- Total other income 1,171 1,698 2,843 1,688 Net loss $(23,708) $(10,972) $(36,427) $(18,260) ========= ========= ========= ========= Net loss per share, basic and diluted $ (0.52) $ (0.32) $ (0.81) $ (0.90) ========= ========= ========= ========= Shares used in computing net loss per share, basic and diluted 45,724 34,622 45,048 20,263 ========= ========= ========= ========= (1) Includes stock compensation expense of $1,633 and $3,998 in the quarters ended June 30, 2001 and 2000, respectively, and includes stock compensation expense of $2,800 and $6,002 in the six month periods ended June 30, 2001 and 2000, respectively. (2) Includes stock compensation expense of $661 and $1,297 in the quarters ended June 30, 2001 and 2000, respectively, and includes stock compensation expense of $1,370 and $2,556 in the six month periods ended June 30, 2001 and 2000, respectively. The accompanying notes are an integral part of these consolidated condensed financial statements.

EXELIXIS, INC. CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (IN THOUSANDS) (unaudited) SIX MONTHS ENDED JUNE 30, -------------------------- 2001 2000 --------- --------- Cash flows from operating activities: Net loss $(36,427) $(18,260) Adjustments to reconcile net loss to net cash provided by (used in) operating activities: Depreciation and amortization 4,401 1,749 Amortization of deferred stock compensation 4,170 8,558 Amortization of goodwill and other intangibles 2,276 - Acquired in-process research and development 6,673 - Changes in assets and liabilities: Other receivables (587) (751) Other current assets (962) (973) Related party receivables (399) 160 Other assets (2,203) (20) Accounts payable and accrued expenses (2,070) 2,800 Deferred revenue 9,747 10,163 --------- --------- Net cash provided by (used in) operating activities (15,381) 3,426 --------- --------- Cash flows from investing activities: Purchases of property and equipment (10,403) (8,498) Proceeds from sale-leaseback of equipment 4,008 - Cash acquired in acquisition 3,463 - Proceeds from maturity of short-term investments 90,469 - Purchases of short-term investments (74,203) (73,045) --------- --------- Net cash provided by (used in) investing activities 13,334 (81,543) --------- --------- Cash flows from financing activities: Proceeds from initial public offering, net - 124,709 Proceeds from convertible note 30,000 - Proceeds from exercise of stock options and warrants 309 545 Proceeds from employee stock purchase plan 1,198 - Repayments of notes from stockholders 105 - Principal payments on capital lease obligations (1,922) (386) Principal payments on notes payable (1,025) (733) --------- --------- Net cash provided by financing activities 28,665 124,135 --------- --------- Effect of foreign exchange rate changes on cash (107) - Net increase in cash and cash equivalents 26,511 46,018 Cash and cash equivalents, at beginning of period 19,552 5,400 --------- --------- Cash and cash equivalents, at end of period $ 46,063 $ 51,418 ========= ========= The accompanying notes are in integral part of these consolidated condensed financial statements.

EXELIXIS, INC. NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS JUNE 30, 2001 (UNAUDITED) NOTE 1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Organization - ------------ Exelixis, Inc. ("Exelixis" or the "Company") is a genomics-based biotechnology company focused on product development through its expertise in comparative genomics and model system genetics. An outstanding team of Company scientists has developed multiple fungal, nematode, insect, plant and vertebrate genetic systems. Exelixis' proprietary model systems and comparative genomics technologies address gene function by using biologically relevant functional genomics information very early on in the process to rapidly, efficiently and cost-effectively translate sequence data to knowledge about the function of genes and the proteins that they encode. The Company also has a significant internal cancer discovery and drug development program. Exelixis believes that its technology is broadly applicable to all life science industries including pharmaceutical, diagnostic, agricultural biotechnology and animal health. The Company has active partnerships with Aventis, Bayer, Bristol-Myers Squibb, Pharmacia, Protein Design Labs and Dow AgroSciences. Basis of Presentation - ----------------------- The accompanying unaudited condensed consolidated financial statements have been prepared by the Company in accordance with accounting principles generally accepted in the United States of America for interim financial information and pursuant to the instructions to Form 10-Q and Article 10 of Regulation S-X of the Securities and Exchange Commission ("SEC"). Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of the Company's management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. Operating results for the three and six month periods ended June 30, 2001 are not necessarily indicative of the results that may be expected for the year ending December 31, 2001, or for any future period. These financial statements and notes should be read in conjunction with the consolidated financial statements and notes thereto for the year ended December 31, 2000 included in the Company's Annual Report on Form 10-K. Net Loss per Share - --------------------- Basic and diluted net loss per share is computed by dividing the net loss for the period by the weighted average number of shares of common stock outstanding during the period. The calculation of diluted net loss per share excludes potential common stock if their effect is antidilutive. Potential common stock consists of common stock subject to repurchase, incremental common shares issuable upon the exercise of stock options and warrants and shares issuable upon conversion of the preferred stock and a convertible promissory note. Comprehensive Income - --------------------- There are two components of other comprehensive income: unrealized gains on available-for-sale securities and foreign currency translation adjustments. For the three and six month periods ended June 30, 2001, total comprehensive loss amounted to approximately $23.7 and $36.5 million, respectively. For the three and six month periods ended June 30, 2000, total comprehensive loss amounted to $10.9 million and $18.2 million, respectively. Foreign Currency Translation - ------------------------------ The Company's German subsidiary, Artemis Pharmaceuticals GmbH ("Artemis"), uses its local currency as its functional currency. Assets and liabilities are translated at exchange rates in effect at the balance sheet date and income and expense amounts at the average exchange rates during the period. Resulting translation adjustments are recorded directly to a separate component of stockholders' equity. Reclassification - ---------------- Certain prior period amounts have been reclassified to conform to the current period presentation. Recent Accounting Pronouncements - ---------------------------------- In July 2001, the Financial Accounting Standards Board ("FASB") issued SFAS No. 141 "Business Combinations" ("SFAS No. 141"), which establishes financial accounting and reporting for business combinations and supersedes APB Opinion No. 16, Business Combinations, and FASB Statement No. 38, Accounting for Preacquisition Contingencies of Purchased Enterprises. SFAS No. 141 requires that all business combinations be accounted for using one method, the purchase method. The provisions of SFAS No. 141 apply to all business combinations initiated after June 30, 2001. The adoption of SFAS No. 141 is expected to have no material impact on financial reporting and related disclosures of the Company. In July 2001, the FASB issued SFAS No. 142 "Goodwill and Other Intangible Assets" ("SFAS No. 142"), which establishes financial accounting and reporting for acquired goodwill and other intangible assets and supersedes APB Opinion No. 17, Intangible Assets. SFAS No. 142 addresses how intangible assets that are acquired individually or with a group of other assets (but not those acquired in a business combination) should be accounted for in financial statements upon their acquisition, and after they have been initially recognized in the financial statements. The provisions of SFAS No. 142 are effective for fiscal years beginning after December 15, 2001. The Company will adopt SFAS No. 142 during the first quarter of fiscal 2002, and is in the process of evaluating the impact of implementation on the financial position of the Company. NOTE 2. SALE OF VINIFERA OWNERSHIP INTEREST On March 31, 2001, the Company reduced its ownership interest in Vinifera, Inc. ("Vinifera") to 19% by selling 3.0 million shares of Vinifera common stock back to Vinifera in consideration for $2.1 million in interest bearing promissory notes. The promissory notes bear interest rates of prime plus 1% and are payable in two installments of $400,000, due no later than September 30, 2001 and February 28, 2002, respectively, and one installment of $1.3 million, due on February 28, 2006. Due to risks associated with Vinifera's operating results, the Company has reserved for $1.7 million of these promissory notes. As a result of this transaction, the Company recorded the following amounts as an adjustment to goodwill recorded in connection with the acquisition of Agritope, Inc. (parent company of Vinifera), based on the operating results of Vinifera through March 31, 2001: a write down of the value of acquired developed technology attributable to Vinifera, a gain on sale of Vinifera shares, and the promissory note reserve. The net adjustment was an increase to goodwill in the amount of $675,000. Beginning April 1, 2001, the Company accounts for its remaining investment in Vinifera using the cost method. NOTE 3. ACQUISITION OF ARTEMIS In May 2001, Exelixis acquired a majority of the outstanding capital stock of Artemis, a privately held genetics and functional genomics company organized under the laws of Germany. The transaction, which was accounted for under the purchase method of accounting, was effected through the exchange of shares of Exelixis common stock for DEM 1.00 of nominal value of Artemis capital stock, using an exchange ratio of 4.064 to one. Approximately 1.6 million shares of Exelixis common stock were issued in exchange for 78% of the outstanding capital stock of Artemis held by the Artemis stockholders. In addition, Exelixis received a call option (the "Call Option") from, and issued a put option (the "Put Option") to, certain stockholders of Artemis (the "Option Holders") for the issuance of approximately 480,000 shares of Exelixis common stock in exchange for the remaining 22% of the outstanding capital stock of Artemis held by the Artemis stockholders. Exelixis may exercise the Call Option at any time from May 14, 2001 through January 31, 2002, and the Option Holders may exercise their rights under the Put Option at any time from April 1, 2002 through May 15, 2002. The value of any shares issued pursuant to exercising the Call Option or Put Option will be added to goodwill. In connection with the acquisition, Exelixis also issued fully vested options representing the right to purchase approximately 187,000 additional shares of Exelixis common stock to Artemis employees in exchange for such employees' vested options formerly representing the right to purchase shares of Artemis capital stock pursuant to an Employee Phantom Stock Option Program. The total consideration for the acquisition was approximately $22.3 million, which consisted of Exelixis common stock and options valued at $21.4 million and estimated Exelixis transaction costs of $900,000. Exelixis' transaction costs include financial advisory, legal, accounting and other fees. Based upon an independent valuation of the tangible and intangible assets acquired, Exelixis management has completed a preliminary allocation of the total cost of the acquisition to the assets acquired and liabilities assumed as follows (in thousands): Tangible assets acquired $6,848 In-process research and development 6,673 Developed technology 1,240 Assembled workforce 1,332 Goodwill 9,655 Patents/core technology 571 Liabilities assumed (4,016) ------- $22,303 ======= The Company will amortize the acquired intangible assets using the following estimated useful lives: Developed technology 5 years Patents/core technology 15 years Assembled workforce 3 years Goodwill 15 years The valuation of the purchased in-process research and development of $6.7 million was based upon the results of an independent valuation using the income approach for each of the three significant in-process projects. The in-process projects relate primarily to the development of technologies that use vertebrate genetic model organisms, zebrafish and mice, to identify and functionally validate novel genes in vivo. These genes can be used as novel screening targets or as the basis for secreted proteins in clinically and commercially relevant diseases. The in-process projects are expected to be completed over the next 18 months. The income approach estimates the value of each acquired project in-process based on its expected future cash flows. The valuation analysis considered the contribution of the core technology as well as the percent complete of each in-process research and development project. The expected present value of the cash flows associated with the in-process research and development projects was computed using a risk adjusted rate of return of 30%, which is considered commensurate with the overall risk and percent complete of the in-process projects. The purchased in-process research and development was not considered to have reached technological feasibility, and it has no alternative future use, accordingly, it has been recorded as a component of operating expense. The revenues, expenses, cash flows and other assumptions underlying the estimated fair value of the acquired in-process research and development involve significant risks and uncertainties. The risks and uncertainties associated with completing the acquired in-process projects include the ability to reach future research milestones since the technologies being developed are unproven, the ability to retain key personal, the ability to obtain licenses to key technology, and the ability to avoid infringing on patents and propriety rights of third parties. PRO FORMA RESULTS The Company's historical statements of operations include the results of Artemis and Agritope, Inc. (now Exelixis Plant Sciences, Inc.) subsequent to the acquisition dates of May 14, 2001 and December 8, 2000, respectively. The following unaudited pro forma financial information presents the consolidated results of the Company as if the acquisitions of Artemis and Agritope had occurred at the beginning of each period presented. Nonrecurring charges, such as acquired in-process research and development, are not reflected in the following pro forma financial information. This unaudited pro forma information is not intended to be indicative of future operating results (in thousands, except per share data). SIX MONTHS ENDED JUNE 30, ------------------------- 2001 2000 --------- --------- Total revenues $ 16,359 $ 16,541 Net loss $(25,754) $(33,357) Net loss per share, basic and diluted $ (1.09) $ (0.72) NOTE 4. SUPPLEMENTAL STOCK OPTION PLAN During April 2001, the Company granted approximately 545,000 supplemental stock options ("Supplemental Options") under the 2000 Equity Incentive Plan to employees (excluding officers and directors) who had stock options with exercise prices greater than $16.00 per share under the 2000 Equity Incentive Plan. The number of Supplemental Options granted were equal to 50% of the corresponding original grant held by each employee, have an exercise price of $16.00, vest monthly over a two year period beginning April 1, 2001, and have a 27 month term. The vesting on the corresponding original grants was halted and will resume in April 2003 following the completion of vesting of the Supplemental Options. This new grant constitutes a synthetic repricing as defined in FASB Interpretation Number 44 "Accounting for Certain Transactions Involving Stock Compensation" and will result in certain options being reported using the variable plan method of accounting for stock compensation expense until they are exercised, forfeited or expire. For the quarter ended June 30, 2001, the compensation expense recorded for these supplemental options is approximately $0.3 million. NOTE 5. COMMITMENTS During April 2001, the Company entered into a master lease agreement with a third party lessor for an equipment lease line of credit of up to $12.0 million, which expires on December 31, 2001. The master lease agreement provides for a periodic delivery structure. Each delivery has a payment term of 36 or 48 months depending on the type of the equipment purchased under the lease. At June 30, 2001, $7.9 million was outstanding under the equipment lease line of credit. Under the master lease agreement, the Company is subject to certain financial covenants. As of June 30, 2001, the Company was in compliance with all such covenants. NOTE 6. COLLABORATION AGREEMENTS On May 22, 2001, the Company and Protein Design Labs, Inc. ("PDL") entered into a collaboration to discover and develop humanized antibodies for the diagnosis, prevention and treatment of cancer. The collaboration will utilize Exelixis' model organism genetics technology for the identification of new cancer drug targets, and PDL's antibody and clinical development expertise to create and develop new antibody drug candidates. PDL will provide Exelixis with $4.0 million in annual research funding for two or more years and has purchased a $30.0 million convertible note. The note bears interest at 5.75% and the interest thereon is payable annually. The note is convertible into Exelixis common stock at a conversion price per share equal to the lower of (i) $28.175 and (ii) 110% of the Fair Market Value (as defined in the note) of a share of Exelixis common stock at the time of conversion. On July 17, 2001, the Company and Bristol-Myers Squibb Company ("BMS") entered into a collaboration. The collaboration involved three agreements: (a) a Stock Purchase Agreement; (b) a Cancer Collaboration Agreement; and (c) a License Agreement. Under the terms of the collaboration, BMS (i) purchased 600,600 shares of Exelixis Common Stock in a private placement at a purchase price of $33.30 per share, for proceeds to Exelixis of approximately $20.0 million; (ii) agreed to pay Exelixis a $5.0 million upfront license fee and provide Exelixis with $3.0 million per year in research funding for a minimum of three years; and (iii) granted to Exelixis a worldwide, fully-paid, exclusive license to an analogue to Rebeccamycin developed by BMS, which is currently in Phase I and Phase II clinical studies for cancer. Due to risk and uncertainties with Rebeccamycin, this was given no value in the collaboration agreement. Exelixis has agreed to provide BMS with exclusive rights to certain potential small molecule compound drug targets in cancer identified during the term of the research collaboration. The premium of $10.0 million on the stock purchase by BMS is being accounted for similar to an upfront license fee. Therefore, revenue is being recognized ratably over the life of the contract. On July 26, 2001, the Company announced the reacquisition, effective February 2002, of future rights to research programs in metabolism and alzheimer's disease previously licensed exclusively to Pharmacia Corporation ("Pharmacia"). Pharmacia will retain rights to targets under the existing agreement selected prior to the reacquisition date, subject to the payment of milestones for certain of those targets selected and royalties for future development of products against or using those targets but will have no other obligations to make payments to the Company, including approximately $9.0 million in annual funding that would otherwise be payable for an additional two years if the Company had not elected to reacquire rights to the research at this time. ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS This discussion and analysis should be read in conjunction with our financial statements and accompanying notes included in this report and the 2000 audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2000. Operating results are not necessarily indicative of results that may occur in future periods. The following discussion and analysis contains forward-looking statements that are based upon current expectations. Forward-looking statements involve risks and uncertainties. Our actual results and the timing of events may differ significantly from the results discussed in the forward-looking statements. Factors that might cause such a difference include, but are not limited to, those discussed in "Risk Factors" as well as those discussed elsewhere in this document and those discussed in our Annual Report on Form 10-K. OVERVIEW We believe that we are a leader in the discovery and validation of high-quality novel targets for several major human diseases, and a leader in the discovery of potential new drug therapies, specifically for cancer and other proliferative diseases. Our mission is to develop proprietary cancer products by leveraging our integrated discovery platform to increase the speed, efficiency and quality of pharmaceutical and agricultural product discovery and development. Through our expertise in comparative genomics and model system genetics, we are able to find new drug targets that we believe would be difficult or impossible to uncover using other experimental approaches. Our pharmaceutical research identifies novel genes and proteins expressed by those genes that, when changed, either decrease or increase the activity in a specific disease pathway in a therapeutically relevant manner. These genes and proteins then represent either potential product targets or drugs that may treat disease, or prevent disease initiation or progression. We have established commercial collaborations with Aventis CropScience, Bayer, Bristol-Myers Squibb, Dow AgroSciences, Pharmacia and Protein Design Labs, which provide us with substantial funding, including licensing fees, research funding, milestone payments when specific objectives are met and royalties, if our partners successfully develop and commercialize products. In addition, many of these collaborations provide us with access to strategic technologies and product development opportunities. Revenues from these collaborations were $16.3 million for the six months ended June 30, 2001, $24.8 million in 2000, $10.5 million for the same period in 1999 and $2.3 million for the same period in 1998. Our sources of potential revenue for the next several years are likely to include upfront license and other fees, funded research payments under existing and possible future collaborative arrangements and milestone payments and royalties from our collaborators based on revenues received from any products commercialized under those agreements. We have a history of operating losses resulting principally from costs associated with research and development activities, investment in core technologies and general and administrative functions. As a result of planned expenditures for future research and development activities, including manufacturing and clinical development expenses for a compound in Phase II clinical studies, Exelixis expects to incur additional operating losses for the foreseeable future. License, research commitment and other non-refundable payments received in connection with research collaboration agreements are deferred and recognized on a straight-line basis over the relevant periods specified in the agreements, generally the research term. Exelixis recognizes contract research revenues as services are performed in accordance with the terms of the agreements. Any amounts received in advance of performance are recorded as deferred revenue. ACQUISITION OF ARTEMIS PHARMACEUTICALS In May 2001, we acquired a majority of the outstanding capital stock of Artemis Pharmaceuticals GmbH, a privately held genetics and functional genomics company organized under the laws of Germany ("Artemis"). The transaction, which was accounted for under the purchase method of accounting, was effected through the exchange of shares of our common stock for DEM 1.00 of nominal value of Artemis capital stock, using an exchange ratio of 4.064 to one. Approximately 1.6 million shares of our common stock was issued in exchange for 78% of the outstanding capital stock of Artemis held by the Artemis stockholders. In addition, we received a call option (the "Call Option") from, and issued a put option (the "Put Option") to, certain stockholders of Artemis (the "Option Holders") for the issuance of approximately 480,000 shares of our common stock in exchange for the remaining 22% of the outstanding capital stock of Artemis held by the Option Holders. We may exercise the Call Option at any time from May 14, 2001 through January 31, 2002, and the Option Holders may exercise their rights under the Put Option at any time from April 1, 2002 through May 15, 2002. The value of any shares issued pursuant to exercising the Call Option or Put Option will be added to goodwill. In connection with the acquisition, we also issued fully vested options representing the right to purchase approximately 187,000 additional shares of our common stock to Artemis employees in exchange for such employees' vested options formerly representing the right to purchase shares of Artemis capital stock pursuant to an Employee Phantom Stock Option Program. The purchase price, which for financial accounting purposes was valued at $22.3 million, was allocated to the assets acquired and the liabilities assumed based on their estimated fair values at the date of acquisition, as determined by management based upon an independent valuation. As a result of this transaction, we recorded expense associated with the purchase of in-process research and development of $6.7 million, net tangible assets of $2.8 million, and intangible assets (including goodwill) of $12.8 million, the majority of which will be amortized over 15 years. RESULTS OF OPERATIONS REVENUES Total revenues were $8.6 million and $16.3 million for the three- and six-month periods ended June 30, 2001, respectively, compared to $5.6 million and $11.6 million, respectively, for the comparable periods in 2000. The increase in revenues over the 2000 levels was primarily due to additional license and contract revenues earned from existing collaborations with Bayer, Bristol-Myers Squibb, Pharmacia, and Dow AgroSciences, revenues earned under the collaboration with Aventis Crop Sciences resulting from our acquisition of Agritope, Inc., now renamed Exelixis Plant Sciences, Inc., and revenues earned under our new collaboration with PDL entered into in May 2001. Our acquisition of Artemis in May 2001 also resulted in approximately $0.3 million in additional revenue. We expect revenues to continue to increase during the remainder of 2001 with the signing of our new collaboration agreement with Bristol-Myers Squibb in July 2001. RESEARCH AND DEVELOPMENT EXPENSES Research and development expenses consist primarily of salaries and other personnel-related expenses, facilities costs, supplies and depreciation of facilities and laboratory equipment. Research and development expenses were $20.6 million and $37.4 million for the three- and six-month periods ended June 30, 2001, respectively, compared to $13.4 million and $22.3 million, respectively, for the comparable periods in 2000. The increase was due primarily to increased staffing and other personnel-related costs. These expenses were incurred to support new collaborative arrangements, our internal self-funded research efforts, including the significant build-out of our drug discovery organization and increased expenses related to the ongoing research and development activities at Agritope and Artemis. This was partially offset by a decrease in non-cash stock compensation expense (as described below). We expect to continue to devote substantial resources to research and development. In addition, we expect that research and development expenses will continue to increase in absolute dollar amounts in the future as we assume the responsibility for manufacturing and clinical development of a Phase I/II cancer compound and as we continue to expand our proprietary drug development efforts. GENERAL AND ADMINISTRATIVE EXPENSES General and administrative expenses consist primarily of personnel costs to support our worldwide activities, facilities costs and professional expenses, such as legal fees. General and administrative expenses were $5.0 million and $9.2 million for the three- and six-month periods ended June 30, 2001, respectively, compared to $4.9 million and $9.2 million, respectively, for the comparable periods in 2000. General and administrative expenses remained flat year-over-year due primarily to a decrease in non-cash stock compensation expense (as described below) which offset our increased staffing and other personnel related costs and rent for facilities and expenses associated with expanding our corporate headquarters. We expect that our general and administrative expenses will increase in absolute dollar amounts in the future as we support a larger, worldwide organization through expanding our administrative staff and adding infrastructure to support our growing research and development efforts. STOCK COMPENSATION EXPENSE Deferred stock compensation for options granted to our employees is the difference between the deemed value for financial reporting purposes of our common stock on the date such options were granted and their exercise price. Deferred stock compensation for options granted to consultants has been determined in accordance with SFAS No. 123, "Accounting for Stock-Based Compensation" ("SFAS 123") and is periodically remeasured as the underlying options vest in accordance with Emerging Issues Task Force ("EITF") No. 96-18, "Accounting for Equity Instruments that are Issued to Other Than Employees for Acquiring, or in Conjunction with, Selling Goods or Services." As of June 30, 2001, the Company has recorded $6.8 million of deferred stock compensation, net of amortization, related to stock options granted to consultants and employees. Stock compensation expense is being recognized in accordance with FASB Interpretation No. 28 "Accounting for Stock Appreciation Rights and Other Variable Stock Option or Award Plans" ("FIN 28") over the vesting periods of the related options, generally four years. During April 2001, the Company granted approximately 545,000 supplemental stock options ("Supplemental Options") under the 2000 Equity Incentive Plan to certain employees (excluding officers and directors) who had stock options with exercise prices greater than $16.00 per share under the 2000 Equity Incentive Plan. The number of Supplemental Options granted was equal to 50% of the corresponding original grant held by each employee. The Supplemental Options have an exercise price of $16.00, vest monthly over a two year period beginning April 1, 2001, and have a 27 month term. The vesting on the corresponding original stock options was halted and will resume in April 2003 following the completion of vesting of the Supplemental Options. This new grant constitutes a synthetic repricing as defined in FASB Interpretation Number 44, "Accounting for Certain Transactions Involving Stock Compensation" and will result in certain options being reported using the variable plan method of accounting for stock compensation expense until they are exercised, forfeited or expire. For the quarter ended June 30, 2001, the compensation expense recorded for these supplemental options was approximately $0.3 million. The Company recognized stock compensation expense of $2.3 million and $4.2 million for the three- and six-month periods ended June 30, 2001, respectively, compared to $5.3 million and $8.6 million, respectively, for the comparable periods in 2000. The decrease in stock compensation expense year-over-year primarily results from the accelerated amortization method proscribed by FIN 28 partially offset by the expense resulting from the synthetic repricing effect of the supplemental options. ACQUIRED IN-PROCESS RESEARCH AND DEVELOPMENT The valuation of the purchased in-process research and development related to the acquisition Artemis of $6.7 million was determined by management based upon the results of an independent valuation using the income approach for each of the three significant in-process projects. The in-process projects relate primarily to the development of technologies that use vertebrate genetic model organisms, zebrafish and mice, to identify and functionally validate novel genes in vivo. These genes can be used as novel screening targets or as the basis for secreted proteins in clinically and commercially relevant diseases. The in-process projects are expected to be completed over the next 18 months. The income approach estimates the value of each acquired project in-process based on its expected future cash flows. The valuation analysis considered the contribution of the core technology as well as the percent complete of each in-process research and development project. The expected present value of the cash flows associated with the in-process research and development projects was computed using a risk adjusted rate of return of 30%, which is considered commensurate with the overall risk and percent complete of the in-process projects. The purchased in-process technology was not considered to have reached technological feasibility, and it has no alternative future use, accordingly, it has been recorded as a component operating expense. AMORTIZATION OF GOODWILL AND INTANGIBLES Amortization of goodwill and intangibles results from our acquisitions of Artemis and Agritope, now renamed Exelixis Plant Sciences, Inc. Amortization of goodwill and intangibles was $1.2 million and $2.3 million for the three and six month periods ended June 30, 2001, respectively, compared to none for the comparable periods in 2000. OTHER INCOME (EXPENSE), NET Other income (expense), net primarily consists of interest income earned on cash, cash equivalents and short-term investments, partially offset by interest expense incurred on notes payable and capital lease obligations. Net interest income was $1.2 million and $2.8 million for the three- and six-month periods ended June 30, 2001, respectively, compared to $1.7 million for the comparable periods in 2000. The increase year-over-year primarily relates to having earned interest on higher levels of cash, cash equivalents and short-term investments for a full six months during 2001, as compared to 2000 when we closed our initial public offering in April. The decrease for the current quarter compared to last year primarily relates to lower interest income due to declining cash balances and an increase in interest expense for additional capital leases. LIQUIDITY AND CAPITAL RESOURCES Since inception, we have financed our operations primarily through private placements of preferred stock, loans, convertible debt, equipment lease financing and other loan facilities and payments from collaborators. In addition, during the second quarter of 2000, we completed our initial public offering raising $124.5 million in net cash proceeds. We intend to continue to use the proceeds for research and development activities, capital expenditures, working capital and other general corporate purposes. As of June 30, 2001, we had approximately $123.1 million in cash, cash equivalents and short-term investments. Our operating activities used cash of $15.4 million for the six months ended June 30, 2001, compared to cash provided of $3.4 million for the six months ended June 30, 2000. Cash used in operating activities related primarily to funding net operating losses, partially offset by an increase in non-cash charges related to depreciation and amortization of deferred stock compensation, goodwill and other intangible assets. Our investing activities provided cash of $13.3 million for the six months ended June 30, 2001, compared to cash used of $81.5 million for the corresponding period in 2000. Investing activities consist primarily of maturities of short-term investments, partially offset by purchases of short-term investments and property and equipment for the six months ended June 30, 2001. We expect to continue to make significant investments in research and development and our administrative infrastructure, including the purchase of property and equipment to support our expanding operations. Our financing activities provided cash of $28.7 million and $124.1 million for the six months ended June 30, 2001, and 2000, respectively. These amounts consisted primarily of proceeds from a $30.0 million convertible note entered into as part of our collaboration agreement with Protein Design Labs in May 2001 and proceeds from our initial public offering in April 2000. We believe that our current cash and cash equivalents, short-term investments and committed funding to be received from collaborators, will be sufficient to satisfy our anticipated cash needs for at least the next two years. However, it is possible that we will seek additional financing within this timeframe. We may raise additional funds through public or private financings, collaborative relationships or other arrangements. In July 2001, we filed a registration statement on Form S-3 to offer and sell up to $150.0 million of common stock. We have no current commitments to offer or sell securities with respect to shares that may be offered or sold pursuant to this filing. We cannot assure you that additional funding, if sought, will be available or, even if available, will be available on terms favorable to us. Further, any additional equity financing may be dilutive to stockholders, and debt financing, if available, may involve restrictive covenants. Our failure to raise capital when needed may harm our business and operating results. RECENT ACCOUNTING PRONOUNCEMENTS In July 2001, the Financial Accounting Standards Board ("FASB") issued SFAS No. 141 "Business Combinations" ("SFAS No. 141"), which establishes financial accounting and reporting for business combinations and supersedes APB Opinion No. 16, Business Combinations, and FASB Statement No. 38, Accounting for Preacquisition Contingencies of Purchased Enterprises. SFAS No. 141 requires that all business combinations be accounted for using one method, the purchase method. The provisions of SFAS No. 141 apply to all business combinations initiated after June 30, 2001. The adoption of SFAS No. 141 is expected to have no material impact on financial reporting and related disclosures of the Company. In July 2001, the FASB issued SFAS No. 142 "Goodwill and Other Intangible Assets" ("SFAS No. 142"), which establishes financial accounting and reporting for acquired goodwill and other intangible assets and supersedes APB Opinion No. 17, Intangible Assets. SFAS No. 142 addresses how intangible assets that are acquired individually or with a group of other assets (but not those acquired in a business combination) should be accounted for in financial statements upon their acquisition, and after they have been initially recognized in the financial statements. The provisions of SFAS No. 142 are effective for fiscal years beginning after December 15, 2001. The Company will adopt SFAS No. 142 during the first quarter of fiscal 2002, and is in the process of evaluating the impact of implementation on the financial position of the Company. ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK Our investments are only subject to interest rate risk and our interest income may fluctuate due to changes in U.S. interest rates. By policy, we limit our investments to money market instruments, debt securities of U.S. government agencies and debt obligations of U.S. corporations. We manage market risk by our diversification requirements, which limit the amount of our portfolio that can be invested in a single issuer. We manage credit risk by limiting our purchases to high quality issuers. Through our money manager, we maintain risk management control systems to monitor interest rate risk. The risk management control systems use analytical techniques, including sensitivity analysis. A hypothetical 1% adverse move in interest rates along the entire interest rate yield curve would cause an approximately $0.5 million decline in the value of our financial instruments at June 30, 2001. All highly liquid investments with an original maturity of three months or less from the date of purchase are considered cash equivalents. The Company views its available-for-sale portfolio as available for use in current operations. Accordingly, we have classified all investments with an original maturity date greater than three months as short-term, even though the stated maturity date may be one year or more beyond the current balance sheet date. Due to our German operations, we have market risk exposure to adverse changes in foreign currency exchange rates. The revenues and expenses of our subsidiary Artemis Pharmaceuticals, GmbH are denominated in Deutche Marks. At the end of each quarter, the revenues and expenses of this subsidiary are translated into U.S. dollars using the average currency rate in effect for the quarter and assets and liabilities are translated into U.S. dollars using the exchange rate in effect at the end of the quarter. Fluctuations in exchange rates therefore impact our financial condition and results of operations, as reported in U.S. dollars. To date we have not experienced any significant negative impact as a result of fluctuations in foreign currency markets. As a policy, we do not engage in speculative or leveraged transactions, nor do we hold financial instruments for trading purposes. We will periodically analyze our exposure to foreign currency fluctuations and may adjust our policies to allow for financial hedging techniques to minimize exchange rate risk. PART II. OTHER INFORMATION ITEM 2. CHANGES IN SECURITIES AND USE OF PROCEEDS (c) On May 22, 2001, we issued a convertible promissory note for the aggregate principal amount of $30.0 million (the "Note") to Protein Design Labs, Inc. ("PDL") in connection with the execution of a collaboration agreement. The Note, which bears interest at a rate of 5.75% annually, is convertible into shares of Exelixis common stock, par value $0.001 per share (the "Exelixis Common Stock"), after the first anniversary of the Note's date of issuance. The Note is convertible into Exelixis Common Stock at a conversion price per share equal to the lower of (i) $28.175 and (ii) 110% of the Fair Market Value (as defined in the Note) of a share of Exelixis Common Stock at the time of conversion. We issued the Note in reliance upon an exemption from the registration requirements of the Securities Act by virtue of Section 4(2) thereof and Regulation D promulgated thereunder. On May 14, 2001, we acquired all, or rights to acquire all, of the outstanding capital stock of Artemis Pharmaceuticals GmbH, a privately held genetics and functional genomics company organized under the laws of Germany ("Artemis"). The acquisition of Artemis (the "Acquisition") was effected pursuant to a Share Exchange and Assignment Agreement among Exelixis and the stockholders of Artemis (not including Exelixis, the "Artemis Stockholders"), dated as of April 23, 2001 (the "Exchange Agreement"), providing for the exchange of 4.064 shares of Exelixis Common Stock for each DEM 1.00 of nominal value of Artemis capital stock. Pursuant to the Exchange Agreement, Exelixis issued approximately 1.6 million shares of its common stock, in exchange for 78% of the outstanding capital stock of Artemis held by the Artemis Stockholders. In addition, we received a call option (the "Call Option") from, and issued a put option (the "Put Option") to, certain stockholders of Artemis (the "Option Holders") for the issuance of approximately 480,000 shares of Exelixis Common Stock in exchange for the remaining 22% of the outstanding capital stock of Artemis held by the Artemis Stockholders. We may exercise the Call Option at any time from May 14, 2001 through January 31, 2002, and the Option Holders may exercise their rights under the Put Option at any time from April 1, 2002 through May 15, 2002. Further, in connection with the Acquisition, we issued fully vested options representing the right to purchase approximately 187,000 additional shares of Exelixis Common Stock to Artemis employees in exchange for such employees' vested options formerly representing the right to purchase shares of Artemis capital stock pursuant to an Employee Phantom Stock Option Plan. We issued the restricted shares of Exelixis Common Stock in reliance upon an exemption from the registration requirements of the Securities Act by virtue of Section 4(2) thereof and Regulation D promulgated thereunder. (d) In May 2000, we completed our initial public offering for aggregate proceeds of approximately $136.0 million. In connection with the offering, We paid a total of approximately $9.5 million in underwriting discounts and commissions and $2.0 million in other offering costs and expenses. After deducting the underwriting discounts and commissions and the offering costs and expenses, the net proceeds from the offering were approximately $124.5 million. From the time of receipt through June 30, 2001, the proceeds from the offering were used for research and development activities, capital expenditures, working capital and other general corporate purposes. In the future, Exelixis intends to use the net proceeds in a similar manner. As of June 30, 2001, approximately $93.1 million of the proceeds remained available and were primarily invested in short-term marketable securities. ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS At the 2001 Annual Meeting of Stockholders held on May 22, 2001, the stockholders were asked to vote on two items as follows: 1. To elect two Class II directors, Jason Fisherman, M.D. and Jean-Francois Formela, M.D., to hold office until the 2004 Annual Meeting of Stockholders; and 2. To ratify the selection of PricewaterhouseCoopers LLP as independent accountants of the Company for its fiscal year ended December 31, 2001. The results of the matters presented at the annual meeting, based on 46,797,585 shares of record entitled to vote, were as follows: 1. Drs. Fisherman and Formela were approved as directors of the Company until the 2004 Annual Meeting of Stockholders as follows: For Withheld ---------- -------- Jason Fisherman 33,564,553 276,908 Jean-Francois Formela 33,563,612 277,849 2. The ratification of PricewaterhouseCoopers LLP as independent accountants of the Company for its fiscal year ended December 31, 2001 was approved as follows: For Against Abstain Broker Non-Vote ---------- ------- ------- --------------- 33,715,423 120,139 5,899 0 ITEM 5. OTHER INFORMATION - RISK FACTORS WE HAVE A HISTORY OF NET LOSSES. WE EXPECT TO CONTINUE TO INCUR NET LOSSES, AND WE MAY NOT ACHIEVE OR MAINTAIN PROFITABILITY. We have incurred net losses each year since our inception, including a net loss of approximately $36.4 million for the six months ended June 30, 2001. As of that date, we had an accumulated deficit of approximately $166.5 million. We expect these losses to continue and anticipate negative cash flow for the foreseeable future. The size of these net losses will depend, in part, on the rate of growth, if any, in our license and contract revenues and on the level of our expenses. Our research and development expenditures and general and administrative costs have exceeded our revenues to date, and we expect to spend significant additional amounts to fund research and development in order to enhance our core technologies and undertake product development. As a result, we expect that our operating expenses will increase significantly in the near term and, consequently, we will need to generate significant additional revenues to achieve profitability. Even if we do increase our revenues and achieve profitability, we may not be able to sustain or increase profitability. WE WILL NEED ADDITIONAL CAPITAL IN THE FUTURE, WHICH MAY NOT BE AVAILABLE TO US. Our future capital requirements will be substantial, and will depend on many factors including: - payments received under collaborative agreements; - the progress and scope of our collaborative and independent research and development projects; - our ability to successfully continue development of a recently acquired cancer compound; - our need to expand our other proprietary product development efforts as well as develop manufacturing and marketing capabilities to commercialize products; and - the filing, prosecution and enforcement of patent claims. We anticipate that our current cash and cash equivalents, short-term investments and funding to be received from collaborators will enable us to maintain our currently planned operations for at least the next two years. Changes to our current operating plan may require us to consume available capital resources significantly sooner than we expect. For example, our newly acquired cancer product from our recent relationship with Bristol-Myers Squibb will require significant resources for development that were not in our operational plans prior to acquiring the cancer product. We may be unable to raise sufficient additional capital when we need it, on favorable terms, or at all. If our capital resources are insufficient to meet future capital requirements, we will have to raise additional funds. The sale of equity or convertible debt securities in the future may be dilutive to our stockholders, and debt financing arrangements may require us to pledge certain assets and enter into covenants that would restrict our ability to incur further indebtedness. If we are unable to obtain adequate funds on reasonable terms, we may be required to curtail operations significantly or to obtain funds by entering into financing, supply or collaboration agreements on unattractive terms. DIFFICULTIES WE MAY ENCOUNTER MANAGING OUR GROWTH MAY DIVERT RESOURCES AND LIMIT OUR ABILITY TO SUCCESSFULLY EXPAND OUR OPERATIONS. We have experienced a period of rapid and substantial growth that has placed, and our anticipated growth in the future will continue to place a strain on our administrative and operational infrastructure. As our operations expand, we expect that we will need to manage multiple locations, including additional locations outside of the United States, and additional relationships with various collaborative partners, suppliers and other third parties. Our ability to manage our operations and growth effectively requires us to continue to improve our operational, financial and management controls, reporting systems and procedures. We may not be able to successfully implement improvements to our management information and control systems in an efficient or timely manner and may discover deficiencies in existing systems and controls. In addition, acquisitions involve the integration of different financial and management reporting systems. We may not be able to successfully integrate the administrative and operational infrastructure without significant additional improvements and investments in management systems and procedures. WE ARE DEPENDENT ON OUR COLLABORATIONS WITH MAJOR COMPANIES. IF WE ARE UNABLE TO ACHIEVE MILESTONES, DEVELOP PRODUCTS OR RENEW OR ENTER INTO NEW COLLABORATIONS, OUR REVENUES MAY DECREASE AND OUR ACTIVITIES MAY FAIL TO LEAD TO COMMERCIALIZED PRODUCTS. Substantially all of our revenues to date have been derived from collaborative research and development agreements. Revenues from research and development collaborations depend upon continuation of the collaborations, the achievement of milestones and royalties derived from future products developed from our research. If we are unable to successfully achieve milestones or our collaborators fail to develop successful products, we will not earn the revenues contemplated under such collaborative agreements. In addition, some of our collaborations are exclusive and preclude us from entering into additional collaborative arrangements with other parties in the area or field of exclusivity. We currently have continuing collaborative research agreements with Bayer, Bristol-Myers Squibb (two agreements), Dow AgroSciences, Aventis and Protein Design Labs. Our current collaborative agreement with Bayer is scheduled to expire in 2008, after which it will automatically be extended for one-year terms unless terminated by either party upon 12-month written notice. Our agreement permits Bayer to terminate our collaborative activities prior to 2008 upon the occurrence of specified conditions, such as the failure to agree on key strategic issues after a period of years or the acquisition of Exelixis by certain specified third parties. In addition, our agreements with Bayer are subject to termination at an earlier date if two or more of our Chief Executive Officer, Chief Scientific Officer, Agricultural Biotechnology Program Leader and Chief Informatics Officer cease to have a relationship with us within six months of each other and we are unable to find replacements acceptable to Bayer. The first of our collaborative agreement with Bristol-Myers Squibb expires in September 2002. The funded research term of second arrangement, entered into in July 2002, expires in July 2005. Our collaborative agreement with Dow AgroSciences is scheduled to expire in July 2003, after which Dow AgroSciences has the option to renew on an annual basis. Our collaborative research arrangement with Aventis is scheduled to expire in June 2004. Aventis has the right to terminate the research arrangement prior to the expiration date, provided that it pays the annual research funding amount due for the year following termination. Thereafter, the arrangement renews annually unless Aventis terminates automatic renewal prior to the scheduled date of renewal. The Aventis arrangement is conducted through a limited liability company, Agrinomics, which is owned equally by Aventis and Exelixis. Aventis may surrender its interest in Agrinomics and terminate the related research collaboration prior to the scheduled expiration upon the payment of the subsequent year's funding commitment. Bayer and Aventis recently announced an exclusive negotiation period for the purchase of Aventis by Bayer. We have not been advised of the status of those discussions nor are we able to predict the impact of such an acquisition of Aventis, if the acquisition were to occur. Our agreement with Protein Design Labs is scheduled to expire in May 2003. Protein Design Labs has a unilateral right to renew for additional 12 and six month periods thereafter. The five-year term of the convertible promissory note entered into as part of this arrangement is unaffected by whether or not Protein Design Labs renews. If these existing agreements are not renewed or if we are unable to enter into new collaborative agreements on commercially acceptable terms, our revenues and product development efforts may be adversely affected. We recently announced the reacquisition, effective February 2002, of future rights to research programs in metabolism and alzheimer's disease previously licensed exclusively to Pharmacia Corporation. The existing agreement with Pharmacia will terminate as of that date. Pharmacia will retain rights to targets under the existing agreement selected prior to the reacquisition date, subject to the payment of milestones for certain of those targets selected and royalties for future development of products against or using those targets but will have no other obligations to make payments to the Company, including approximately $9.0 million in annual funding that would otherwise be payable for two years if the Company had not elected to reacquire rights to the research at this time. Although we anticipate entering into future collaborations involving either or both of these programs, there can be no assurance that we will be able to enter into new collaborative agreements or that such collaborations will provide revenues equal to or exceeding those otherwise obtainable under the Pharmacia collaboration. CONFLICTS WITH OUR COLLABORATORS COULD JEOPARDIZE THE OUTCOME OF OUR COLLABORATIVE AGREEMENTS AND OUR ABILITY TO COMMERCIALIZE PRODUCTS. We intend to conduct proprietary research programs in specific disease and agricultural product areas that are not covered by our collaborative agreements. Our pursuit of opportunities in agricultural and pharmaceutical markets could, however, result in conflicts with our collaborators in the event that any of our collaborators takes the position that our internal activities overlap with those areas that are exclusive to our collaborative agreements, and we should be precluded from such internal activities. Moreover, disagreements with our collaborators could develop over rights to our intellectual property. In addition, our collaborative agreements may have provisions that give rise to disputes regarding the rights and obligations of the parties. Any conflict with our collaborators could lead to the termination of our collaborative agreements, delay collaborative activities, reduce our ability to renew agreements or obtain future collaboration agreements or result in litigation or arbitration and would negatively impact our relationship with existing collaborators. We have limited or no control over the resources that our collaborators may choose to devote to our joint efforts. Our collaborators may breach or terminate their agreements with us or fail to perform their obligations thereunder. Further, our collaborators may elect not to develop products arising out of our collaborative arrangements or may fail to devote sufficient resources to the development, manufacture, market or sale of such products. Certain of our collaborators could also become our competitors in the future. If our collaborators develop competing products, preclude us from entering into collaborations with their competitors, fail to obtain necessary regulatory approvals, terminate their agreements with us prematurely or fail to devote sufficient resources to the development and commercialization of our products, our product development efforts could be delayed and may fail to lead to commercialized products. WE ARE DEPLOYING UNPROVEN TECHNOLOGIES, AND WE MAY NOT BE ABLE TO DEVELOP COMMERCIALLY SUCCESSFUL PRODUCTS. You must evaluate us in light of the uncertainties and complexities affecting a biotechnology company. Our technologies are still in the early stages of development. Our research and operations thus far have allowed us to identify a number of product targets for use by our collaborators and our own internal development programs. We are not certain, however, of the commercial value of any of our current or future targets, and we may not be successful in expanding the scope of our research into new fields of pharmaceutical or pesticide research, or other agricultural applications such as enhancing plant traits to produce superior crop yields, disease resistance or increased nutritional content. Significant research and development, financial resources and personnel will be required to capitalize on our technology, develop commercially viable products and obtain regulatory approval for such products. WE HAVE NO EXPERIENCE IN DEVELOPING, MANUFACTURING AND MARKETING PRODUCTS AND MAY BE UNABLE TO COMMERCIALIZE PROPRIETARY PRODUCTS. We recently acquired a development compound, an analog to rebeccamycin ("Rebeccamycin"), directed against cancer under our recent collaborative arrangement with Bristol-Myers Squibb. Clinical development of Rebeccamycin to date has been conducted by the National Cancer Institute (the "NCI"), and manufacturing of this product has been the responsibility of Bristol-Myers Squibb. Rebeccamycin has recently completed Phase I clinical studies and is in Phase I and early Phase II clinical trials being conducted by the NCI. We are currently in negotiations with the NCI to use the results of the clinical studies they have conducted and are conducting in order to determine what additional studies, if any, will be conducted by the NCI or us. There can be no assurance that we will successfully agree upon further development plans, the respective rights and obligations of the parties to conduct additional clinical studies or the timing of such studies. In addition, there can be no assurance that the clinical studies conducted to date will support further clinical development or be accepted by the Food and Drug Administration or FDA, in conjunction with any application for product approval submitted to the FDA for Rebeccamycin. Moreover, although Bristol-Myers Squibb has provided the NCI with sufficient quantities of Rebeccamycin to complete the existing Phase I and II clinical studies, development necessary for further clinical studies and product approval will require us to either develop internal manufacturing capabilities or retain a third party to manufacture the product. In addition, we have recently hired a new Senior Vice President responsible for clinical development of this product, as well as any new potential products that we may develop. As a result, we have limited experience in clinical development and no experience in manufacturing potential drug products. Accordingly, the development of Rebeccamycin is subject to significant risk and uncertainty, particularly with respect to our ability to successfully develop, manufacture and market Rebeccamycin as a product. With respect to products developed against our proprietary drug targets, we will rely on our collaborators to develop and commercialize products based on our research and development efforts. We have limited or no experience in using the targets that we identify to develop our own proprietary products. Our recent success in applying our drug development capabilities to our proprietary targets in cancer are subject to significant risk and uncertainty, particularly with respect to our ability to meet currently estimated timelines and goals for completing preclinical development efforts and filing an Investigational New Drug Application ("IND") for compounds developed. In order for us to commercialize products, we would need to significantly enhance our capabilities with respect to product development, and establish manufacturing and marketing capabilities, either directly or through outsourcing or licensing arrangements. We may not be able to enter into such outsourcing or licensing agreements on commercially reasonable terms, or at all. SINCE OUR TECHNOLOGIES HAVE MANY POTENTIAL APPLICATIONS AND WE HAVE LIMITED RESOURCES, OUR FOCUS ON A PARTICULAR AREA MAY RESULT IN OUR FAILURE TO CAPITALIZE ON MORE PROFITABLE AREAS. We have limited financial and managerial resources. This requires us to focus on product candidates in specific industries and forego opportunities with regard to other products and industries. For example, depending on our ability to allocate resources, a decision to concentrate on a particular agricultural program may mean that we will not have resources available to apply the same technology to a pharmaceutical project. While our technologies may permit us to work in both areas, resource commitments may require trade-offs resulting in delays in the development of certain programs or research areas, which may place us at a competitive disadvantage. Our decisions impacting resource allocation may not lead to the development of viable commercial products and may divert resources from more profitable market opportunities. Moreover, our recent acquisition of Rebeccamycin will require that resources and management time be directed to clinical development and manufacturing of this potential product. There can be no assurance that allocating resources and time to these efforts will allow us to remain competitive in existing programs and potential areas of future research. The resources dedicated to the development of Rebeccamycin may limit or hinder our ability to meet currently estimated timelines and goals for completing preclinical development efforts and filing an IND for our proprietary compounds. OUR COMPETITORS MAY DEVELOP PRODUCTS AND TECHNOLOGIES THAT MAKE OURS OBSOLETE. The biotechnology industry is highly fragmented and is characterized by rapid technological change. In particular, the area of gene research is a rapidly evolving field. We face, and will continue to face, intense competition from large biotechnology and pharmaceutical companies, as well as academic research institutions, clinical reference laboratories and government agencies that are pursuing research activities similar to ours. Some of our competitors have entered into collaborations with leading companies within our target markets, including some of our existing collaborators. Our future success will depend on our ability to maintain a competitive position with respect to technological advances. Any products that are developed through our technologies will compete in highly competitive markets. Further, our competitors may be more effective at using their technologies to develop commercial products. Many of the organizations competing with us have greater capital resources, larger research and development staffs and facilities, more experience in obtaining regulatory approvals and more extensive product manufacturing and marketing capabilities. As a result, our competitors may be able to more easily develop technologies and products that would render our technologies and products, and those of our collaborators, obsolete and noncompetitive. IF WE ARE UNABLE TO ADEQUATELY PROTECT OUR INTELLECTUAL PROPERTY, THIRD PARTIES MAY BE ABLE TO USE OUR TECHNOLOGY, WHICH COULD ADVERSELY AFFECT OUR ABILITY TO COMPETE IN THE MARKET. Our success will depend in part on our ability to obtain patents and maintain adequate protection of the intellectual property related to our technologies and products. The patent positions of biotechnology companies, including our patent position, are generally uncertain and involve complex legal and factual questions. We will be able to protect our intellectual property rights from unauthorized use by third parties only to the extent that our technologies are covered by valid and enforceable patents or are effectively maintained as trade secrets. The laws of some foreign countries do not protect intellectual property rights to the same extent as the laws of the U.S., and many companies have encountered significant problems in protecting and defending such rights in foreign jurisdictions. We will continue to apply for patents covering our technologies and products as and when we deem appropriate. However, these applications may be challenged or may fail to result in issued patents. Our existing patents and any future patents we obtain may not be sufficiently broad to prevent others from practicing our technologies or from developing competing products. Furthermore, others may independently develop similar or alternative technologies or design around our patents. In addition, our patents may be challenged, invalidated or fail to provide us with any competitive advantages. We rely on trade secret protection for our confidential and proprietary information. We have taken security measures to protect our proprietary information and trade secrets, but these measures may not provide adequate protection. While we seek to protect our proprietary information by entering into confidentiality agreements with employees, collaborators and consultants, we cannot assure you that our proprietary information will not be disclosed, or that we can meaningfully protect our trade secrets. In addition, our competitors may independently develop substantially equivalent proprietary information or may otherwise gain access to our trade secrets. LITIGATION OR THIRD PARTY CLAIMS OF INTELLECTUAL PROPERTY INFRINGEMENT COULD REQUIRE US TO SPEND SUBSTANTIAL TIME AND MONEY AND ADVERSELY AFFECT OUR ABILITY TO DEVELOP AND COMMERCIALIZE PRODUCTS. Our commercial success depends in part on our ability to avoid infringing patents and proprietary rights of third parties, and not breaching any licenses that we have entered into with regard to our technologies. Other parties have filed, and in the future are likely to file, patent applications covering genes and gene fragments, techniques and methodologies relating to model systems, and products and technologies that we have developed or intend to develop. If patents covering technologies required by our operations are issued to others, we may have to rely on licenses from third parties, which may not be available on commercially reasonable terms, or at all. Third parties may accuse us of employing their proprietary technology without authorization. In addition, third parties may obtain patents that relate to our technologies and claim that use of such technologies infringes these patents. Regardless of their merit, such claims could require us to incur substantial costs, including the diversion of management and technical personnel, in defending ourselves against any such claims or enforcing our patents. In the event that a successful claim of infringement is brought against us, we may be required to pay damages and obtain one or more licenses from third parties. We may not be able to obtain these licenses at a reasonable cost, or at all. Defense of any lawsuit or failure to obtain any of these licenses could adversely affect our ability to develop and commercialize products. THE LOSS OF KEY PERSONNEL OR THE INABILITY TO ATTRACT AND RETAIN ADDITIONAL PERSONNEL COULD IMPAIR OUR ABILITY TO EXPAND OUR OPERATIONS. We are highly dependent on the principal members of our management and scientific staff, the loss of whose services might adversely impact the achievement of our objectives and the continuation of existing collaborations. In addition, recruiting and retaining qualified scientific personnel to perform future research and development work will be critical to our success. We do not currently have sufficient executive management and technical personnel to fully execute our business plan. There is currently a shortage of skilled executives and employees with technical expertise, and this shortage is likely to continue. As a result, competition for skilled personnel is intense and turnover rates are high. Although we believe we will be successful in attracting and retaining qualified personnel, competition for experienced scientists from numerous companies, academic and other research institutions may limit our ability to do so. Our business operations will require additional expertise in specific industries and areas applicable to products identified and developed through our technologies. These activities will require the addition of new personnel, including management and technical personnel and the development of additional expertise by existing employees. The inability to attract such personnel or to develop this expertise could prevent us from expanding our operations in a timely manner, or at all. OUR COLLABORATIONS WITH OUTSIDE SCIENTISTS MAY BE SUBJECT TO RESTRICTION AND CHANGE. We work with scientific advisors and collaborators at academic and other institutions that assist us in our research and development efforts. These scientists are not our employees and may have other commitments that would limit their availability to us. Although our scientific advisors and collaborators generally agree not to do competing work, if a conflict of interest between their work for us and their work for another entity arises, we may lose their services. In addition, although our scientific advisors and collaborators sign agreements not to disclose our confidential information, it is possible that valuable proprietary knowledge may become publicly known through them. OUR POTENTIAL THERAPEUTIC PRODUCTS ARE SUBJECT TO A LENGTHY AND UNCERTAIN REGULATORY PROCESS THAT MAY NOT RESULT IN THE NECESSARY REGULATORY APPROVALS, WHICH COULD ADVERSELY AFFECT OUR ABILITY TO COMMERCIALIZE PRODUCTS. The FDA must approve any drug or biologic product before it can be marketed in the U.S. Any products resulting from our research and development efforts must also be approved by the regulatory agencies of foreign governments before the product can be sold outside the U.S. Before a new drug application or biologics license application can be filed with the FDA, the product candidate must undergo extensive clinical trials, which can take many years and may require substantial expenditures. The regulatory process also requires preclinical testing. Data obtained from preclinical and clinical activities are susceptible to varying interpretations, which could delay, limit or prevent regulatory approval. In addition, delays or rejections may be encountered based upon changes in regulatory policy for product approval during the period of product development and regulatory agency review. The clinical development and regulatory approval process is expensive and time consuming. Any failure to obtain regulatory approval could delay or prevent us from commercializing products. Our efforts to date have been primarily limited to identifying targets. Significant research and development efforts will be necessary before any products resulting from such targets can be commercialized. If regulatory approval is granted to any of our products, this approval may impose limitations on the uses for which a product may be marketed. Further, once regulatory approval is obtained, a marketed product and its manufacturer are subject to continual review, and discovery of previously unknown problems with a product or manufacturer may result in restrictions and sanctions with respect to the product, manufacturer and relevant manufacturing facility, including withdrawal of the product from the market. SOCIAL ISSUES MAY LIMIT THE PUBLIC ACCEPTANCE OF GENETICALLY ENGINEERED PRODUCTS, WHICH COULD REDUCE DEMAND FOR OUR PRODUCTS. Although our technology is not dependent on genetic engineering, genetic engineering plays a prominent role in our approach to product development. For example, research efforts focusing on plant traits may involve either selective breeding or modification of existing genes in the plant under study. Public attitudes may be influenced by claims that genetically engineered products are unsafe for consumption or pose a danger to the environment. Such claims may prevent our genetically engineered products from gaining public acceptance. The commercial success of our future products will depend, in part, on public acceptance of the use of genetically engineered products including drugs and plant and animal products. The subject of genetically modified organisms has received negative publicity, which has aroused public debate. For example, certain countries in Europe are considering regulations that may ban products or require express labeling of products that contain genetic modifications or are "genetically modified." Adverse publicity has resulted in greater regulation internationally and trade restrictions on imports of genetically altered products. If similar action is taken in the U.S., genetic research and genetically engineered products could be subject to greater domestic regulation, including stricter labeling requirements. To date, our business has not been hampered by these activities. However, such publicity in the future may prevent any products resulting from our research from gaining market acceptance and reduce demand for our products. LAWS AND REGULATIONS MAY REDUCE OUR ABILITY TO SELL GENETICALLY ENGINEERED PRODUCTS THAT OUR COLLABORATORS OR WE DEVELOP IN THE FUTURE. Our collaborators or we may develop genetically engineered agricultural and animal products. The field-testing, production and marketing of genetically engineered products are subject to regulation by federal, state, local and foreign governments. Regulatory agencies administering existing or future regulations or legislation may prevent us from producing and marketing genetically engineered products in a timely manner or under technically or commercially feasible conditions. In addition, regulatory action or private litigation could result in expenses, delays or other impediments to our product development programs and the commercialization of products. The FDA has released a policy statement stating that it will apply the same regulatory standards to foods developed through genetic engineering as it applies to foods developed through traditional plant breeding. Genetically engineered food products will be subject to premarket review, however, if these products raise safety questions or are deemed to be food additives. Our products may be subject to lengthy FDA reviews and unfavorable FDA determinations if they raise questions regarding safety or our products are deemed to be food additives. The FDA has also announced that it will not require genetically engineered agricultural products to be labeled as such, provided that these products are as safe and have the same nutritional characteristics as conventionally developed products. The FDA may reconsider or change its policies, and local or state authorities may enact labeling requirements, either of which could have a material adverse effect on our ability or the ability of our collaborators to develop and market products resulting from our efforts. WE USE HAZARDOUS CHEMICALS AND RADIOACTIVE AND BIOLOGICAL MATERIALS IN OUR BUSINESS. ANY CLAIMS RELATING TO IMPROPER HANDLING, STORAGE OR DISPOSAL OF THESE MATERIALS COULD BE TIME CONSUMING AND COSTLY. Our research and development processes involve the controlled use of hazardous materials, including chemicals, radioactive and biological materials. Our operations produce hazardous waste products. We cannot eliminate the risk of accidental contamination or discharge and any resultant injury from these materials. Federal, state and local laws and regulations govern the use, manufacture, storage, handling and disposal of hazardous materials. We may be sued for any injury or contamination that results from our use or the use by third parties of these materials, and our liability may exceed our insurance coverage and our total assets. Compliance with environmental laws and regulations may be expensive, and current or future environmental regulations may impair our research, development and production efforts. In addition, our collaborators may use hazardous materials in connection with our collaborative efforts. To our knowledge, their work is performed in accordance with applicable biosafety regulations. In the event of a lawsuit or investigation, however, we could be held responsible for any injury caused to persons or property by exposure to, or release of, these hazardous materials use by these parties. Further, we may be required to indemnify our collaborators against all damages and other liabilities arising out of our development activities or products produced in connection with these collaborations. WE EXPECT THAT OUR QUARTERLY RESULTS OF OPERATIONS WILL FLUCTUATE, AND THIS FLUCTUATION COULD CAUSE OUR STOCK PRICE TO DECLINE, CAUSING INVESTOR LOSSES. Our quarterly operating results have fluctuated in the past and are likely to fluctuate in the future. A number of factors, many of which we cannot control, could subject our operating results and stock price to volatility, including: - recognition of license, milestone or other fees; - payments of licensing fees to third parties; - acceptance of our technologies and platforms; - the success rate of our discovery efforts leading to milestones and royalties; - the introduction of new technologies or products by our competitors; - the timing and willingness of collaborators to commercialize our products; - our ability to enter into new collaborative relationships; - the termination or non-renewal of existing collaborations; - general and industry-specific economic conditions that may affect our collaborators' research and development expenditures; and - exposure to fluctuations in foreign currency A large portion of our expenses, including expenses for facilities, equipment and personnel, are relatively fixed in the short term. In addition, we expect operating expenses to increase significantly during the next year. Accordingly, if our revenues decline or do not grow as anticipated due to the expiration of existing contracts or our failure to obtain new contracts, our inability to meet milestones or other factors, we may not be able to correspondingly reduce our operating expenses. Failure to achieve anticipated levels of revenues could therefore significantly harm our operating results for a particular fiscal period. Due to the possibility of fluctuations in our revenues and expenses, we believe that quarter-to-quarter comparisons of our operating results are not a good indication of our future performance. As a result, in some future quarters, our operating results may not meet the expectations of stock market analysts and investors, which could result in a decline in the price of our stock. OUR STOCK PRICE MAY BE EXTREMELY VOLATILE. We believe the trading price of our common stock will remain highly volatile and may fluctuate substantially due to factors such as the following: - the announcement of new products or services by us or our competitors; - quarterly variations in our or our competitors' results of operations; - failure to achieve operating results projected by securities analysts; - changes in earnings estimates or recommendations by securities analysts; - developments in the biotechnology industry; - acquisitions of other companies or technologies; and - general market conditions and other factors, including factors unrelated to our operating performance or the operating performance of our competitors. These factors and fluctuations, as well as general economic, political and market conditions, may materially adversely affect the market price of our common stock. In the past, following periods of volatility in the market price of a company's securities, securities class action litigation has often been instituted. A securities class action suit against us could result in substantial costs and divert management's attention and resources, which could have a material and adverse effect on our business. WE ARE EXPOSED TO RISKS ASSOCIATED WITH ACQUISITIONS. We have made, and may in the future make, acquisitions of, or significant investments in, businesses with complementary products, services and/or technologies. Acquisitions involve numerous risks, including, but not limited to: - difficulties and increased costs in connection with integration of the personnel, operations, technologies and products of acquired companies; - diversion of management's attention from other operational matters; - the potential loss of key employees of acquired companies; - the potential loss of key collaborators of the acquired companies; - lack of synergy, or the inability to realize expected synergies, resulting from the acquisition; and - acquired intangible assets becoming impaired as a result of technological advancements or worse-than-expected performance of the acquired company. Mergers and acquisitions, are inherently risky, and the inability to effectively manage these risks could materially and adversely affect our business, financial condition and results of operations. IF PRODUCT LIABILITY LAWSUITS ARE SUCCESSFULLY BROUGHT AGAINST US, WE COULD FACE SUBSTANTIAL LIABILITIES THAT EXCEED OUR RESOURCES. We may be held liable if any product our collaborators or we develop causes injury or is found otherwise unsuitable during product testing, manufacturing, marketing or sale. Although we intend to obtain general liability and product liability insurance, this insurance may be prohibitively expensive, or may not fully cover our potential liabilities. Inability to obtain sufficient insurance coverage at an acceptable cost or to otherwise protect ourselves against potential product liability claims could prevent or inhibit the commercialization of products developed by our collaborators or us. OUR FACILITIES ARE LOCATED NEAR KNOWN EARTHQUAKE FAULT ZONES, AND THE OCCURRENCE OF AN EARTHQUAKE OR OTHER CATASTROPHIC DISASTER COULD CAUSE DAMAGE TO OUR FACILITIES AND EQUIPMENT, WHICH COULD REQUIRE US TO CEASE OR CURTAIL OPERATIONS. Given our location, our facilities are vulnerable to damage from earthquakes. We are also vulnerable to damage from other types of disasters, including fire, floods, power loss, communications failures and similar events. If any disaster were to occur, our ability to operate our business at our facilities would be seriously, or potentially completely, impaired. In addition, the unique nature of our research activities could cause significant delays in our programs and make it difficult for us to recover from a disaster. The insurance we maintain may not be adequate to cover our losses resulting from disasters or other business interruptions. Accordingly, an earthquake or other disaster could materially and adversely harm our ability to conduct business. FUTURE SALES OF OUR COMMON STOCK MAY DEPRESS OUR STOCK PRICE. If our stockholders sell substantial amounts of our common stock (including shares issued upon the exercise of outstanding options and warrants) in the public market, the market price of our common stock could fall. These sales also might make it more difficult for us to sell equity or equity-related securities in the future at a time and price that we deemed appropriate. In October 2000, a significant number of shares of our common stock held by existing stockholders became freely tradable, subject in some instances to the volume and other limitations of Rule 144. Sales of these shares and other shares of common stock held by existing stockholders could cause the market price of our common stock to decline. SOME OF OUR EXISTING STOCKHOLDERS CAN EXERT CONTROL OVER US, AND MAY NOT MAKE DECISIONS THAT ARE IN THE BEST INTERESTS OF ALL STOCKHOLDERS. Due to their combined stock holdings, our officers, directors and principal stockholders (stockholders holding more than 5% of our common stock) acting together, may be able to exert significant influence over all matters requiring stockholder approval, including the election of directors and approval of significant corporate transactions. In addition, this concentration of ownership may delay or prevent a change in control of our company, even when a change may be in the best interests of our stockholders. In addition, the interests of these stockholders may not always coincide with our interests as a company or the interests of other stockholders. Accordingly, these stockholders could cause us to enter into transactions or agreements that you would not approve. ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K (a) Exhibits The exhibits listed on the accompanying index to exhibits are filed or incorporated by reference (as stated therein) as part of this Quarterly Report on Form 10-Q. (b) Reports on Form 8-K On May 15, 2001, the Company filed a Reg FD, Item 9 Current Report on Form 8-K, in connection with the announcement of the Company's first quarter financial results. On May 15, 2001, the Company filed an Item 2 Current Report on Form 8-K in connection with the Company's acquisition of Artemis.

SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. Date: August 14, 2001 EXELIXIS, INC. /s/ Glen Y. Sato ------------------- Glen Y. Sato Chief Financial Officer, Vice President of Legal Affairs and Secretary (Principal Financial and Accounting Officer)

INDEX TO EXHIBITS Exhibit Number Description of Document - ------ ------------------------- 2.1 Share Exchange and Assignment Agreement, dated April 23, 2001, by and among Exelixis, Inc. and the Artemis stockholders named therein. (1) 3.1 Amended and Restated Certificate of Incorporation (2) 3.2 Amended and Restated Bylaws (2) 4.1 Specimen Common Stock Certificate (2) 4.2 Form of Convertible Promissory Note, dated May 22, by and between Exelixis,Inc. and Protein Design Labs, Inc. 4.3 Form of Note Purchase Agreement, dated May 22, by and between Exelixis, Inc.and Protein Design Labs, Inc. 10.28* Collaboration Agreement, dated May 22, 2001, by and between Exelixis, Inc. and Protein Design Labs, Inc. - ------------------------------- (1) Filed with Exelixis' Item 2 Current Report on Form 8-K filed on May 15, 2001 and incorporated herein by reference. (2) Filed with Exelixis' Registration Statement on Form S-1, as amended (No. 333-96335), declared effective by the Securities and Exchange Commission on April 10, 2000, and incorporated herein by reference. * Confidential treatment requested for certain portions of this exhibit.

NEITHER  THIS  CONVERTIBLE  NOTE  NOR THE UNDERLYING SHARES HAVE BEEN REGISTERED
UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT").  THE HOLDER
(AS  DEFINED BELOW) MAY NOT TRANSFER THIS CONVERTIBLE NOTE, OR ANY SHARES ISSUED
PURSUANT  TO  ITS  CONVERSION  PROVISION,  UNLESS  (i)  THERE  IS  AN  EFFECTIVE
REGISTRATION  STATEMENT  COVERING  SUCH NOTE OR SUCH SHARES UNDER THE SECURITIES
ACT  AND  APPLICABLE  STATE  SECURITIES  LAWS, (ii) THE COMPANY FIRST RECEIVES A
LETTER  FROM  AN ATTORNEY, ACCEPTABLE TO THE COMPANY OR ITS AGENTS, STATING THAT
IN THE OPINION OF THE ATTORNEY THE PROPOSED TRANSFER IS EXEMPT FROM REGISTRATION
UNDER  THE  SECURITIES  ACT  AND  UNDER ALL APPLICABLE STATE SECURITIES LAWS, OR
(iii)  THE  TRANSFER  IS  MADE  PURSUANT  TO  RULE 144 UNDER THE SECURITIES ACT.

                                 EXELIXIS, INC.

                                5.75% CONVERTIBLE
                              NOTE DUE MAY 22, 2006

                                                 South San Francisco, California

FOR  VALUE  RECEIVED,  Exelixis,  Inc.,  a Delaware corporation (the "Company"),
hereby  promises  to  pay,  subject  to  the  conversion provisions in Section 6
herein,  to  Protein Design Labs, Inc., a Delaware corporation, or its permitted
transfers  and  assigns  (the  "Lender" or "Holder") the principal sum of THIRTY
MILLION  DOLLARS  ($30,000,000) plus interest plus enforcement costs (including,
but  not  limited  to,  reasonable  attorney  fees)  thereon  (collectively, the
"Obligations")  on  the  earlier  of  (i)  a "Change in Control" (as hereinafter
defined)  of  the  Company;  and  (ii) May 22, 2006 (such earlier date being the
"Maturity  Date").  A  "Change  in  Control"  of  the Company would occur if the
Company  sells, conveys or otherwise disposes of all or substantially all of its
property  or  business,  or merges or consolidates with any other corporation or
business entity (other than a wholly-owned subsidiary of the Company) or effects
any  other transaction or series of transactions in which (I) the members of the
Board  of  Directors  of  the  Company  prior  to  the  transaction or series of
transactions constituting the putative Change in Control event do not constitute
a  majority of the members of the Board of Directors of the enterprise following
completion  of  the  transaction  or  series  of  transactions  constituting the
putative  Change  in  Control  event  (and  in any event excluding from any such
calculation  any  members  of  the  Board  of  Directors  who  prior  to  such
transaction(s)  were  members  of  the  Board of both the Company and such other
company  or  entity); and (II) the stockholders of the Company immediately prior
thereto  own  less  than  a majority of the outstanding voting securities of the
Company  (or  its  successor  or  parent)  immediately  thereafter.

SECTION  1.  INTEREST.  Interest  on  the  outstanding principal amount shall be
cumulative,  accrue  at  the  rate of 5.75% per annum (or, if lower, the maximum
rate  permitted  by law), and be paid in cash annually in arrears from and after
the  date  hereof until and including the Maturity Date, unless this convertible
note  ("Note")  is converted pursuant to Section 6 hereof, in which case accrued
interest thereon (whether or not yet payable) shall be payable in cash to Lender
within  thirty (30) days of such date of conversion.  Any interest not paid when
due  shall accrue interest at a rate of 10% per annum (or, if lower, the maximum
rate  permitted  by  law)  and shall be treated as principal for the purposes of
Section  6  hereof  until  paid.

SECTION  2.  NOTE  PURCHASE  AGREEMENT.  This Note has been issued pursuant to a
Note  Purchase  Agreement  (the  "Note Purchase Agreement") dated as of the date
hereof by and among the Company and the Holder.  The Company shall keep or cause
to  be  kept  at its principal office appropriate records for the recordation of
the  name  and  address of the Holder, which address may be changed from time to
time effective ten (10) days after receipt of written notice of such change from
the  Holder.

SECTION  3.  DEFAULT.  The  occurrence  of  one  or more of the following events
shall  constitute  an  event  of  default  ("Event  of  Default"):

3.1     The Company shall fail to pay any of the Obligations when the same shall
have  become  due  and  payable.

3.2     The  Company  shall  fail  to  pay  any  of  its material debts or other
material  obligations (other than the Obligations under this Note) when the same
shall  have  become  due  and  payable.

3.3     The  entry of a decree or order by a court having jurisdiction adjudging
the  Company as bankrupt or insolvent, or approving as properly filed a petition
seeking  reorganization arrangement, adjustment, or composition of or in respect
of  the  Company  under  the Bankruptcy Act, as amended, or any other applicable
federal or state law, or appointing a receiver, liquidator, assignee, or trustee
of the Company, or any substantial part of its property, or ordering the winding
up  or  liquidation  of  its  affairs, and the continuance of any such decree or
order  unstayed  and  in  effect  for  a  period of sixty (60) consecutive days.

3.4     The  institution  by  the  Company  of  proceedings to be adjudicated as
bankrupt  or insolvent, or the consent by it to the institution of bankruptcy or
insolvency  proceedings  against it, or the filing by it of a petition or answer
or  consent  seeking  reorganization  or  relief  under  the  Bankruptcy Act, as
amended,  or  any other applicable federal or state law, or the consent by it to
the filing of any such petition or to the appointment of a receiver, liquidator,
assignee, or trustee of the Company, or of any substantial part of its property,
or  the  making  by  it  of  an  assignment for the benefit of creditors, or the
admission  by  it in writing of its inability to pay its debts generally as they
become  due,  or the taking of corporate action by the Company in furtherance of
any  such  action.

3.5     The  Company shall (a) be in breach of any material term or provision of
this Note; (b) be in breach under Section 12.2 of the Collaboration Agreement of
even  date  herewith  ("Collaboration  Agreement"),  which  breach  shall remain
uncured  as  provided  thereunder;  or  (c) be in breach of any material term or
provision  of  the  Note  Purchase  Agreement.

SECTION  4.  ACCELERATION.  Upon  an  Event  of  Default,  all Obligations shall
become  immediately  due  and payable to the Holder without presentment, demand,
protest  or  other  notice of any kind, all of which are expressly waived by the
Company.

SECTION  5.  PREPAYMENTS.  The  Company may not prepay the amounts due hereunder
prior  to  the  third  anniversary of this Note.  After the third anniversary of
this  Note,  and subject to Holder's right of conversion under Section 6 herein,
the Company shall have the right to prepay the amounts due hereunder in whole or
in  part;  provided  that  the  Company meets the following conditions:  (a) the
Company  shall  provide  the Holder not less than thirty (30) days prior written
notice of each prepayment ("Prepayment Notice"), specifying the principal amount
or  amounts to be prepaid and the prepayment date, and (b) the Company shall pay
on  the  prepayment  date  the  interest accrued to date on the principal amount
paid.  Any  Prepayment  Notice  shall be irrevocable and binding on the Company;
provided  any  Prepayment  Notice shall be deemed rescinded upon notice prior to
the  prepayment  date  that  Holder  intends  to exercise its conversion rights.

SECTION  6.  CONVERSION.

6.1     The Holder of this Note shall have the right, at the Holder's option, at
any  time  after  the  first  anniversary  of this Note, upon written notice, to
convert  all  of  the principal amounts outstanding from time to time under this
Note  into  the  Company's  common  stock  ("Common Stock") at a price per share
("Original  Conversion  Price") equal to the lower of: (x) $28.175; and (y) 110%
of  the  Fair  Market Value (as hereinafter defined) of a share of Common Stock.
"Fair Market Value" of a share of Common Stock means: (i) if the Company's stock
is traded on NASDAQ or a national securities exchange, the average closing price
for such share of Common Stock on such exchange for the twenty (20) trading days
immediately prior to the applicable date of conversion, or (ii) if the Company's
stock is not traded on NASDAQ or a national securities exchange, the fair market
value  of the Company's stock on the applicable date of conversion as determined
in  good  faith  by  the  Company's  Board  of  Directors.

6.2     In  the  event of an exercise of the Holder's rights of conversion under
this  Section 6, the Holder shall irrevocably be obligated to convert all of the
principal  amounts  then  outstanding  under this Note and the Company shall, as
promptly  as practicable after the surrender, but in no event more than fourteen
(14) days after the delivery of the Note for conversion, deliver to the Holder a
certificate  or  certificates  representing  the  number  of  fully  paid  and
nonassessable  shares  of Common Stock of the Company into which this Note shall
be  converted.

6.3     The  number  of  shares  of  Common  Stock  which  shall be delivered on
conversion  of  principal  under  this  Note  shall  be  an amount determined by
dividing  the principal under this Note by the Original Conversion Price (or the
Conversion  Price  (as  defined  below),  as  determined in accordance with this
Section  6),  and rounding the result down to the nearest share.  The conversion
price from time to time specified in Section 6.1 above may be adjusted from time
to time as provided in Section 9, and any adjusted conversion price shall be the
"Conversion  Price."

6.4     No  fractional  shares of stock or scrip shall be issued upon conversion
of this Note. Instead of any fractional shares of stock which would otherwise be
issuable  upon  conversion of this Note, the Company shall pay in cash an amount
equal  to  the fractional share multiplied by the Conversion Price in respect of
such  fractional  interest.

SECTION  7.  ASSIGNMENT,  EXCHANGE,  OR  LOSS  OF NOTE.  Subject to any transfer
restrictions herein, upon presentation and surrender of this Note to the Company
at  its  principal  office with a duly executed request for assignment and funds
sufficient  to  pay any transfer tax, the Company shall, without charge, execute
and  deliver  a new Note in the name of the assignee named in such instrument of
assignment  and  this  Note  shall  promptly  be  canceled.

SECTION  8.  RIGHTS  OF  THE  HOLDER.  The  Holder  shall  not, by virtue of the
provisions  in  this  Note,  be  entitled  to any rights of a stockholder in the
Company,  either  at  law  or  equity.

SECTION  9.  ADJUSTMENTS.   In  case  the  Company  shall,  after the receipt of
notice pursuant to Section 6.1 but prior to the conversion thereunder: (i) pay a
dividend  or  make  a distribution on the Common Stock payable in common shares,
(ii)  subdivide  the  outstanding  Common Stock into a greater number of shares,
(iii)  combine  the  outstanding Common Stock into a lesser number of shares, or
(iv)  issue  by  reclassification  of  the Common Stock any common shares of the
Company,  the Holder of this Note shall thereafter be entitled, upon conversion,
to  receive the number and kind of shares which, if this Note had been converted
immediately  prior  to  the happening of such event, the Holder would have owned
upon  such  conversion  and  been  entitled  to  receive  upon  such  dividend,
distribution,  subdivision,  combination,  or  reclassification. Such adjustment
shall  become  effective  on  the day next following (x) the record date of such
dividend  or  distribution  or  (y)  the  day  upon  which  such  subdivision,
combination,  or  reclassification  shall  become  effective.

SECTION  10.  RESTRICTIONS ON TRANSFER.  This Note has not been registered under
the  Securities  Act.  This  Note,  or  any right hereunder, may not be enforced
against the Company by any Holder, except the original Holder herein, (i) unless
there is an effective registration covering such note or underlying shares under
the Securities Act and applicable state securities laws, (ii) unless the Company
receives an opinion of an attorney acceptable to the Company or its agents, that
the  proposed  transfer  of  the  Note  complies  with  the  requirements of the
Securities  Act  and  any  relevant  state  securities  law, or (iii) unless the
transfer  is  made  pursuant  to  Rule  144  under  the  Securities  Act.

SECTION  11.  NOTICES.  All  notices  and  other  communications  required  or
permitted  under this Note shall be validly given, made, or served if in writing
and  delivered  personally, via overnight courier or sent by registered mail, to
the  Company  at  the  following  address:

     Exelixis,  Inc.
     170  Harbor  Way
     P.O.  Box  511
     South  San  Francisco,  California  94083-0511
     Attn:  Chief  Executive  Officer

With  a  copy  to:

     Exelixis,  Inc.
     170  Harbor  Way
     P.O.  Box  511
     South  San  Francisco,  California  94083-0511
     Attn:  General  Counsel

All notices and other communications required or permitted under this Note shall
be  validly  given,  made  or served if in writing and delivered personally, via
overnight  courier  or  sent  by registered mail, to the Holder at the following
address:
     Protein  Design  Labs,  Inc.
     34801  Campus  Drive
     Fremont,  California  94555-3606
     Attn:  Chief  Executive  Officer

With  a  copy  to:
     Protein  Design  Labs,  Inc.
     34801  Campus  Drive
     Fremont,  California  94555-3606
     Attn:  General  Counsel

Changes  to  a  party's address information provided herein shall be effected by
notice  to  the  other  party  as  provided  herein.

SECTION  12.  LAW  GOVERNING.  This  Note  shall be governed by and construed in
accordance  with  the  internal  laws  of  the  State  of  California.

SECTION  13.  TITLES  AND CAPTIONS; PRESUMPTION.  All section titles or captions
contained  in this Note are for convenience only and shall not be deemed part of
the  context  nor  affect  the  interpretation  of  this Note.  This Note or any
section  thereof  shall  not be construed against any party due to the fact that
said  Note  or  any  section  thereof  was  drafted  by  said  party.

SECTION  14.  COMPUTATION  OF TIME.  In computing any period of time pursuant to
this Note, the day of the act, event or default from which the designated period
of  time  begins to run shall be included, unless it is a Saturday, Sunday, or a
legal  holiday,  in  which  event  the period shall begin to run on the next day
which  is  not  a  Saturday, Sunday, or legal holiday, in which event the period
shall  run  until  the  end  of the next day thereafter which is not a Saturday,
Sunday,  or  legal  holiday.

SECTION  15.  FURTHER  ASSURANCES.  The  Company  shall  execute and deliver all
documents,  provide  all information and take or forbear from all such action as
may  be  necessary  or  appropriate  to  achieve  the  purposes  of  the  Note.

SECTION  16.  PARTIES  IN  INTEREST.  Nothing herein shall be construed to be to
the  benefit  of any third party, nor is it intended that any provision shall be
for  the  benefit  of  any  third  party.
IN  WITNESS  WHEREOF,  a  duly authorized officer of Exelixis, Inc. has executed
this  Note  to  be  effective  on  this  22nd  day  of  May  2001.

                                   EXELIXIS,  INC.

                                   _______________________
                                   George  A.  Scangos
                                   Chief  Executive  Officer


                             NOTE PURCHASE AGREEMENT

     THIS  NOTE PURCHASE AGREEMENT (the "Agreement") is dated as of May 22, 2001
(the  "Effective  Date")  by  and between EXELIXIS, INC., a Delaware corporation
having  its  principal  place of business at 170 Harbor Way, P.O. Box 511, South
San  Francisco,  California  94083-0511 (the "Company") and PROTEIN DESIGN LABS,
INC.,  a  Delaware  corporation  having its principal place of business at 34801
Campus  Drive,  Fremont,  California  94555-3606  (the  "Holder").

                                    RECITALS
     A.  Pursuant to the terms of the Convertible Note (the "Note"), dated as of
even  date herewith between the Company and the Holder, the Holder has loaned to
the  Company  the  principal  sum  of  Thirty Million Dollars ($30,000,000) (the
"Principal  Amount").


     B. The Company has agreed to issue the Note pursuant to the terms set forth
in  this  Agreement.


     NOW,  THEREFORE,  in  consideration  of  the  premises  and promises herein
contained and in order to induce the Holder to loan to the Company the Principal
Amount,  the  Company  agrees  with  the  Holder  as  follows:


1.     AUTHORIZATION  AND  SALE  OF  NOTES

     1.1  AUTHORIZATION OF NOTES. On or before the date hereof the Company shall
authorize  the  issuance  of  the Note in the form attached to this Agreement as
Exhibit  A  in  the  Principal  Amount.

     1.2  SALE  OF NOTE. Subject to the terms and conditions hereof, the Company
will issue and sell to the Holder, and the Holder will purchase from the Company
for  the  Principal Amount, the Note. The Note and the shares of common stock of
the  Company  (the  "Shares")  issued  upon conversion of the Note are sometimes
collectively  referred  to  herein  as  the  "Securities."


2.     CLOSING  DATE;  DELIVERY

     2.2     CLOSING  DATE.  Subject  to  the  terms  and  conditions  of  this
Agreement,  the purchase and sale of the Note hereunder shall take place at 3:00
p.m.  local  time  at  the offices of the Company, on the date hereof or at such
other  time  and  place as the Company and the Holder may agree (the "Closing").
The  date  of  the  Closing  is  hereinafter  referred to as the "Closing Date."

     2.3  DELIVERY.  At  the Closing, the Company will deliver to the Holder the
Note  against  payment  of  the  Principal  Amount  therefor by wire transfer in
immediately  available  funds:

          Bank:  Silicon  Valley  Bank,  Santa  Clara,  CA
          ABA  Routing:  121-140-399
          Acct  Number:  33001-60643

3.     REPRESENTATIONS  AND  WARRANTIES  OF  THE  COMPANY

     The  Company  represents  and  warrants  to  the  Holder  as  follows:

     3.1     ORGANIZATION  AND  STANDING.  The  Company:

     (a)  is  a  corporation  duly  organized,  validly  existing, authorized to
exercise  all its corporate powers, rights, and privileges, and in good standing
under  the  laws  of  the  State  of  Delaware;  and

     (b)  has the corporate power and corporate authority to own and operate its
properties  and  to carry on its business as now conducted and as proposed to be
conducted.

     3.2  AUTHORIZATION  AND  VALIDITY.  All corporate action on the part of the
Company,  its  officers,  directors,  and  stockholders  necessary  for  the
authorization,  execution,  delivery,  and  performance  of all of the Company's
obligations  under  this  Agreement, the Note and all documents, instruments and
agreements  executed  in connection therewith (the "Loan Documents") and for the
authorization,  issuance,  and  delivery of the Note has been taken and the Loan
Documents  constitute  legally  valid  and  binding  obligations of the Company,
enforceable  against  the  Company  in  accordance  with  their  terms.

     3.3  CORPORATE  POWER.  The  Company  has all requisite legal and corporate
power and authority to execute and deliver the Loan Documents, to sell and issue
the  Note hereunder, and to carry out and perform its obligations under the Loan
Documents.

     3.4  VALIDITY  OF  SECURITIES.  The  Securities,  when  issued,  sold,  and
delivered  in  compliance  with the terms and for the consideration expressed in
this  Agreement,  will  be duly authorized and validly issued (including without
limitation, but subject to the accuracy of the representations of Holder herein,
issued  in  compliance  with  all applicable federal and state securities laws),
fully paid and nonassessable. The Securities will be free and clear of all liens
and  encumbrances  other  than  any  liens or encumbrances created by or imposed
thereon  by  the Holder; provided, however, that the Securities shall be subject
to  restrictions  on  transfer  under  state and/or federal securities laws. The
Securities  are not subject to any preemptive rights or rights of first refusal.
The  Shares  have been duly authorized and reserved for issuance upon conversion
of  the  Note.  The  certificate evidencing the Shares will be in due and proper
form.

     3.5  SECURITIES  LAW  COMPLIANCE.  Subject  to  the  accuracy  of  the
representations  and warranties of the Holder set forth in Section 4, the offer,
issue,  and sale of the Securities are exempt from the registration requirements
of  Section  5 of the Securities Act of 1933, as amended, (the "Securities Act")
and the qualification requirements, if any, of applicable state securities laws.

     3.6  NO  CONFLICT.  The  execution,  delivery,  and performance of the Loan
Documents,  the  sale  and  issuance  of  the  Note  and the consummation of the
transactions  contemplated  hereby  and  thereby  will  not  (a)  result  in any
violation  of,  be  in  conflict  with,  or  constitute a default under, with or
without  the  passage  of time or the giving of notice: (i) any provision of the
Company's  Certificate  of  Incorporation  or  Bylaws; (ii) any provision of any
judgment,  decree,  or  order  to which the Company is a party or by which it is
bound;  (iii)  any  material  contract,  obligation,  or commitment to which the
Company  is a party or by which it is bound; or (iv) any material statute, rule,
or  governmental  regulation  applicable  to  the  Company,  (b) (i) require any
consent,  approval,  authorization or other order of, or qualification with, any
court  or  governmental  body  or  agency  (except such as may be required under
applicable securities laws), or (ii) result in the imposition or creation of (or
the obligation to create or impose) a lien under, any agreement or instrument to
which  the Company or any of its subsidiaries is a party or by which the Company
or  any  of  its  subsidiaries  or  their  respective  property  is  bound.

     3.7  PROPERTIES.  The Company and its subsidiaries have good and marketable
title  in  fee  simple to all real property and good and marketable title to all
personal  property owned by them that is material to the business of the Company
and  its  subsidiaries,  in  each  case free and clear of all liens and defects,
except  as  do  not  materially  affect  the  value  of such property and do not
interfere  with  the  use  made  and proposed to be made of such property by the
Company  and  its  subsidiaries;  and any real property and buildings held under
lease  by  the  Company  and  its  subsidiaries  are  held  by them under valid,
subsisting  and  enforceable leases with such exceptions as are not material and
do  not interfere with the use made and proposed to be made of such property and
buildings  by  the  Company  and  its  subsidiaries.

     3.8  SEC  FILINGS,  FINANCIAL  STATEMENTS.  The  Company has filed with the
Securities and Exchange Commission (the "SEC") all required quarterly reports on
Form  10-Q  and annual reports on Form 10-K, registration statements, documents,
and  reports  required  to be filed by it with the SEC or, if not required to be
filed,  such  other  reports  and  documents as have otherwise been filed by the
Company  (collectively, the "SEC Reports"). To the knowledge of the Company, all
of  the  SEC  Reports  complied as to form, when filed, in all material respects
with  the  applicable  provisions  of  the  Securities  Act,  and the Securities
Exchange  Act of 1934, as amended. As of their respective dates, the SEC Reports
did  not  contain  any  untrue  statement  of a material fact or omit to state a
material  fact required to be stated therein or necessary to make the statements
therein,  in  light  of  the  circumstances  under  which  they  were  made, not
misleading.  Each  of  the  consolidated  financial  statements (including notes
thereto)  contained  in  the  SEC  Reports  (a)  was prepared in accordance with
generally  accepted  accounting  principals  applied  on  a  consistent  basis
throughout  the  periods involved (except as indicated in the notes thereto) and
(b)  fairly presented the financial position of the Company as at the respective
dates  thereof.

     3.9  NO  MATERIAL  ADVERSE  CHANGES.  Since  the  filing  of  the Company's
Registration Statement on Form S-4, other than as set forth in the Company's SEC
Reports,  (a)  there  has  not  occurred any material adverse change: (i) in the
financial  condition or operations of the Company and its subsidiaries, taken as
a whole, or (ii) in the capital stock or long-term debt of the Company or any of
its  subsidiaries, taken as a whole, except as contemplated under this Agreement
or  development, that would reasonably be expected to involve a material adverse
change  in  the  financial  condition  or  operations  of  the  Company  and its
subsidiaries, taken as a whole; (b) the Company and its subsidiaries, taken as a
whole,  have  not  sustained  any material loss or interference with its assets,
businesses  or  properties  (whether  owned  or  leased)  from  fire, explosion,
earthquake,  flood  or  other  calamity, whether or not covered by insurance, or
from any labor dispute or any court or legislative or other governmental action,
order or decree; and (c) since the date of the latest consolidated balance sheet
included  in  the  SEC Reports, except as reflected therein, the Company has not
(A)  issued any securities other than the issuance of securities pursuant to the
grant  of  or  the  exercise  of  options  granted  under  stock option plans or
agreements  existing  prior to the date of the latest consolidated balance sheet
included  in  the  SEC Reports, or (B) declared or paid any dividend or made any
distribution  on  any  shares  of  its  capital  stock or redeemed, purchased or
otherwise acquired or agreed to redeem, purchase or otherwise acquire any shares
of  capital stock, except to the extent provided under any stock option plans or
agreements  existing  prior to the latest date of the consolidated balance sheet
included  in  the  SEC  Reports.

4.     REPRESENTATIONS  AND  WARRANTIES  OF  THE  HOLDER

     Holder  hereby  represents  and  warrants  to  the  Company  as  follows:

     4.1  AUTHORIZATION. When executed and delivered by the Holder, and assuming
execution  and  delivery  by  the Company, the Agreement will constitute a valid
obligation  of  such  Holder,  enforceable  in  accordance  with  its  terms.

     4.2  BROKERS  AND  FINDERS.  Holder has not retained any investment banker,
broker,  or  finder  in  connection  with  the transactions contemplated by this
Agreement.

     4.3 INVESTMENT. This Agreement is made with the Holder in reliance upon its
representations  to  the  Company,  which  by  the  Holder's  execution  of this
Agreement  Holder  hereby  confirms,  that  the Securities to be received by the
Holder  will  be  acquired for investment for the Holder's own account, not as a
nominee  or  agent,  and not with a view to the sale or distribution of any part
thereof,  and  that the Holder has no present intention of selling, granting any
participation  in,  or  otherwise  distributing  the  same.  By  executing  this
Agreement,  the  Holder further represents that it has no contract, undertaking,
agreement,  or  arrangement  with  any  person  to  sell,  transfer,  or  grant
participation  to such person or to any third person, with respect to any of the
Securities.

     4.4  NO REGISTRATION. Holder understands and acknowledges that the offering
of  the  Securities  pursuant to this Agreement will not be registered under the
Securities  Act  on  the  grounds  that  the  offering  and  sale  of securities
contemplated  by this Agreement are exempt from registration pursuant to Section
4(2)  of the Securities Act, and that the Company's reliance upon such exemption
is  predicated  upon  Holder's  representations  set  forth  in  this  Agreement

     4.5  LIMITATIONS ON TRANSFERABILITY. Holder covenants that in no event will
it dispose of any of the Securities (other than pursuant to Rule 144 promulgated
by  the  SEC  under  the Securities Act ("Rule 144") or any similar or analogous
rule)  unless  and  until  (i)  Holder  shall  have  notified the Company of the
proposed  disposition,  and  (ii) if requested by the Company, Holder shall have
furnished  the  Company  with  an  opinion  of  counsel satisfactory in form and
substance  to  the Company and the Company's counsel, in the reasonable exercise
of  their  judgment,  to  the  effect that (x) such disposition will not require
registration  under  the Securities Act and (y) appropriate action necessary for
compliance  with  the Securities Act and any applicable state, local, or foreign
law  has been taken.  Notwithstanding the limitations set forth in the foregoing
sentence,  if  Holder  is  a  limited  liability company or a partnership it may
transfer  Securities to its members or constituent partners or a retired partner
of  such  partnership who retires after the date hereof, or to the estate of any
such  member  or  partner  or  retired  partner  or  transfer  by gift, will, or
intestate  succession  to  any  such  member's  or  partner's  spouse  or lineal
descendants  or  ancestors  without  the necessity of registration or opinion of
counsel  if  the transferee agrees in writing to be subject to the terms of this
Agreement  to  the  same  extent  if  such  transferee  were a Holder; provided,
however,  that  Holder  hereby  covenants  not  to  effect such transfer if such
transfer  either  would  invalidate  the  securities laws exemptions pursuant to
which  the  Securities  were originally offered and sold or would itself require
registration under the Securities Act or applicable state securities laws.  Each
certificate  evidencing  the Securities transferred as above provided shall bear
the  appropriate restrictive legends set forth in Sections 7.6 and 7.7(a) below,
except that such certificate shall not bear such legend if the transfer was made
in compliance with Rule 144 or if the opinion of counsel referred to above is to
the  further  effect  that  such  legend  is  not required in order to establish
compliance  with  any  provisions  of  the  Securities  Act.

     4.6  EXPERIENCE.  Holder  represents  that:  (i)  it has such knowledge and
experience  in financial and business matters as to be capable of evaluating the
merits  and  risks  of its prospective investment in the Securities; (ii) it has
received  all  the  information  it has requested from the Company and considers
necessary  or appropriate for deciding whether to purchase the Securities; (iii)
it  has  had  the  opportunity to discuss the Company's business management, and
financial  affairs  with  its  management,  (iv)  it has the ability to bear the
economic  risks  of  its  prospective  investment;  and  (v) it is able, without
materially  impairing  its  financial  condition,  to hold the Securities for an
indefinite  period  of  time  and  to  suffer a complete loss on its investment.

     4.7  ACCREDITED  HOLDER.  Holder  presently  qualifies,  and will as of the
Closing  Date  qualify,  as  an  "accredited  investor"  within  the  meaning of
Regulation  D of the rules and regulations promulgated under the Securities Act.

5.     CONDITIONS  OF  THE  HOLDER'S  OBLIGATIONS  AT  CLOSING

The  obligations  of the Holder under Section 1 of this Agreement are subject to
the  fulfillment  at  or  before the Closing of the following conditions, any of
which  may  be  waived  by  the  Holder:

     5.1  REPRESENTATIONS  AND WARRANTIES. The representations and warranties of
the  Company  contained in Section 3 shall be true on and as of the Closing with
the  same  effect  as  if  made  on  and  as  of  the  Closing.

     5.2  PERFORMANCE.  The  Company  shall  have  performed  or  fulfilled  all
agreements,  obligations,  and  conditions  contained  in the Loan Documents and
required  to  be  performed  or  fulfilled  by  the  Company before the Closing.

6.     CONDITIONS  OF  THE  COMPANY'S  OBLIGATIONS  AT  CLOSING

     The  obligations  of  the  Company  under  Section  1 of this Agreement are
subject  to the fulfillment at or before the Closing of the following condition,
which  may  be  waived  in  writing  by  the  Company:

     6.1  REPRESENTATIONS  AND WARRANTIES. The representations and warranties of
the  Holder  contained  in Section 4 shall be true on and as of the Closing with
the  same  effect  as  if  made  on  and  as  of  the  Closing.

7.     MISCELLANEOUS

     7.1 GOVERNING LAW. This Agreement shall be governed by, and be construed in
accordance  with, the laws of the State of California, excluding those laws that
direct  the  application  of  the  laws  of  another  jurisdiction.

     7.2  SURVIVAL;  TERMINATION.  The  warranties  and  representations  of the
parties  contained  in  or  made  pursuant  to  this Agreement shall survive the
execution  and  delivery of this Agreement and the Closing for until the earlier
of:  (a) the payment in full of all outstanding principal and interest under the
Note,  or  (b)  the  conversion of the Note into Shares, provided, however, that
such representations and warranties need only be accurate as of the date of such
execution  and  delivery  and  as  of  the  Closing.  This  Agreement  shall  be
terminated  and  of no further force and effect upon earlier of: (a) the payment
in  full  of  all  outstanding principal and interest under the Note, or (b) the
conversion  of  the  Note  into  Shares.

     7.3  SUCCESSORS  AND  ASSIGNS.  Except  as  otherwise  provided herein, the
provisions  hereof  shall  inure  to  the  benefit  of  and  be binding upon the
successors,  assigns, heirs, executors and administrators of the parties hereto.

     7.4  ENTIRE  AGREEMENT;  INDEMNITY;  WAIVER.

          (A)  ENTIRE  AGREEMENT.  This  Agreement  and  the  exhibits  hereto
constitute  the  full and entire understanding and agreement between the parties
with  regard to the subjects hereof and thereof, and supersede any and all prior
and  contemporaneous agreements, understandings, discussions and correspondence.

          (B)  WAIVER.  Holder's  failure, at  any time  or times  hereafter, to
requirestrict  performance  by  the  Company  of any provision of this Agreement
shall not waive, affect or diminish any right of the Holder thereafter to demand
strict  compliance  and  performance  therewith. Any suspension or waiver by the
Holder of a default under the Agreement or a default under any of the other Loan
Documents  shall  not  suspend,  waive  or  affect  any other default under this
Agreement  or  any  other default under any of the other Loan Documents, whether
the  same  is  prior  or  subsequent  thereto  and  whether  of the same or of a
different  kind  or character. None of the undertakings, agreements, warranties,
covenants  and representations of the Company contained in this Agreement or any
of the other Loan Documents and no default under this Agreement or default under
any of the other Loan Documents shall be deemed to have been suspended or waived
by  the  Holder  unless  such  suspension  or  waiver is in writing signed by an
officer  of  the  Company,  and  directed  to  the  Holder.

     7.5  NOTICES.  All  notices  and other communications required or permitted
hereunder  shall  be  in  writing and shall be mailed by registered or certified
mail,  postage  prepaid,  sent  by  Federal  Express or other national overnight
delivery  service  or otherwise delivered by hand or by messenger, addressed (a)
if  to  the Holder, at Holder's address set forth below or at such other address
as  the  Holder  shall have furnished to the Company in writing or (b) if to any
other  holder  of  any Note, at such address as such holder shall have furnished
the  Company in writing or, until any such holder so furnishes an address to the
Company,  then  to and at the address of the last holder of such Note who has so
furnished  an  address  to the Company, or (c) if to the Company, at its address
set forth below, or at such other address as the Company shall have furnished to
the  Holder.

        Holder:                              Company:
        Protein  Design  Labs,  Inc.         Exelixis,  Inc.
        34801  Campus  Drive                 170  Harbor  Way
        Fremont,  CA  94555-3606             P.  O.  Box  511
        Attn:  General  Counsel              South San Francisco, CA  94083-0511
                                             Attn:  General  Counsel

     7.6  CALIFORNIA  CORPORATE SECURITIES LAW. THE SALE OF THE SECURITIES WHICH
ARE  THE  SUBJECT OF THIS AGREEMENT HAS NOT BEEN QUALIFIED WITH THE COMMISSIONER
OF  CORPORATIONS  OF THE STATE OF CALIFORNIA AND THE ISSUANCE OF SUCH SECURITIES
OR  THE  PAYMENT  OR  RECEIPT OF ANY PART OF THE CONSIDERATION THEREFOR PRIOR TO
SUCH QUALIFICATION IS UNLAWFUL, UNLESS THE SALE OF SECURITIES IS EXEMPT FROM THE
QUALIFICATION  BY  SECTION 25100, 25102, OR 25105 OF THE CALIFORNIA CORPORATIONS
CODE.

     7.7  LEGENDS.

     (A)     All  certificates  for  the  Securities  shall  bear  a  legend
substantially  similar  to  the  following:

     "The  securities  represented  hereby  have  not  been registered under the
     Securities  Act of 1933, as amended ("Securities Act"). Such securities may
     not  be  transferred  unless  a  Registration Statement under the Act is in
     effect  as  to such transfer or, in the opinion of counsel for the Company,
     registration  under  the  Act  is unnecessary in order for such transfer to
     comply  with  the  Act  or  unless  sold  pursuant to Rule 144 of the Act."

     (B)     The  certificates  evidencing  the  Securities  shall also bear any
legend  required  pursuant  to  any  state, local, or foreign law governing such
securities.

     7.8     COUNTERPARTS.  This  Agreement may be executed in two counterparts,
each  of  which  shall  be  deemed  an original, but all of which together shall
constitute  one  and  the  same instrument. IN WITNESS WHEREOF, the parties have
executed  this  Agreement  as  of  the  day  and  year  first  above  written.


                                             COMPANY:
                                             EXELIXIS,  INC.,
                                             a  Delaware  corporation

                                             _________________________________
                                             George  A.  Scangos
                                             Chief  Executive  Officer



                                             HOLDER:
                                             PROTEIN  DESIGN  LABS,  INC.,
                                             a  Delaware  corporation

                                             _________________________________
                                             Laurence  Jay  Korn
                                             Chairperson  and  Chief  Executive
                                             Officer






     38.
     1.
[  *  ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION  PURSUANT  TO  RULE  24B-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                                                   EXHIBIT 10.28

                             COLLABORATION AGREEMENT

     THIS  COLLABORATION AGREEMENT (the "Agreement") is dated as of May 22, 2001
(the  "Effective  Date")  by  and between EXELIXIS, INC., a Delaware corporation
having  its  principal  place of business at 170 Harbor Way, P.O. Box 511, South
San  Francisco, California 94083-0511 ("EXEL"), and PROTEIN DESIGN LABS, INC., a
Delaware  corporation  having  its  principal  place of business at 34801 Campus
Drive,  Fremont,  California  94555-3606  ("PDL").  EXEL  and  PDL are sometimes
referred  to herein individually as a "Party" and collectively as the "Parties."

                                    RECITALS

     A.  PDL  has  expertise  and  capability  in  developing  antibodies, in
particular  humanized  antibodies,  as  pharmaceuticals.

     B.  EXEL has expertise and proprietary technology relating to drug
discovery  focused  particularly  on  genetic  model  systems,  genomics  and
computational  biology  and is applying such technology to discover and validate
targets  and  products  for  drug  discovery  in  a  variety  of  disease areas.

     C.  PDL  and  EXEL  desire  to  establish  a  collaboration  to utilize the
technology  and  expertise  of PDL and EXEL to identify and characterize targets
for  the  treatment  of  cancer  and  precancerous  conditions, controlling cell
growth,  apoptosis,  and  proliferation, to generate antibodies directed against
such  targets,  and  to  develop  and  commercialize novel antibody products for
diagnostic,  prophylactic  and  therapeutic  uses.

NOW,  THEREFORE,  the  Parties  agree  as  follows:

1.   DEFINITIONS

     The  following  terms  shall  have  the  following meanings as used in this
Agreement:

     1.1  "AFFILIATE"  means,  with  respect to a particular Party, a person,
corporation, partnership, or other entity that controls, is controlled by, or is
under  common  control  with  such Party.  For the purposes of the definition in
this  Section  1.1, the word "control" (including, with correlative meaning, the
terms  "controlled  by"  or  "under  the  common control with") means the actual
power,  either  directly  or  indirectly  through one or more intermediaries, to
direct  or  cause  the  direction of the management and policies of such entity,
whether  by the ownership of at least fifty percent (50%) of the voting stock of
such  entity,  or  by  contract  or  otherwise.
     1.2  "ANTIBODY"  means  a  Humanized  Antibody  or  Precursor  Antibody.

     1.3  "ANTIBODY  INVENTIONS"  means  an  Invention  directed  to Antibodies,
including  without  limitation,  composition  of matter, methods of manufacture,
methods  of  use,  formulations,  dosing  regimens,  etc.

     1.4  "ANTIBODY  TARGET"  means  [  *  ].

     1.5  "ANTIBODY  TARGET  CANDIDATE"  means  [  *  ].

     1.6  "BLA"  means a Biologics License Application as defined in the current
Federal  Food,  Drug  and  Cosmetic  Act, and applicable regulations promulgated
thereunder  by the FDA or the equivalent application to the equivalent agency of
any  other regulatory jurisdiction, as amended from time to time during the term
of  this  Agreement.

     1.7  "CO-FUNDED  PRODUCT"  means  a  Product  for  which  EXEL  has made an
effective  election  to co-fund pursuant to Section 5.1 and which has not ceased
to  be  a  Co-Funded  Product  pursuant  to  Section  5.9.

     1.8  "COLLABORATION"  means all of the research activities performed by, or
on  behalf  of,  EXEL  or  PDL during the Research Term pursuant to the Research
Plan,  through  the  stage  of  evaluation  of  Precursor  Antibodies.

     1.9  "COMBINATION  PRODUCT"  means  any  product  containing  both  (i)
substantially  all  of at least one variable region of an Antibody, and (ii) one
or  more  other  therapeutically  active  ingredients.

     1.10  "COMMERCIALIZATION  PLAN" shall have the meaning set forth in Section
3.4(b).

     1.11  "CONTROLLED"  means,  with respect to all or any portion of any gene,
protein,  compound,  material,  Information or intellectual property right, that
the  Party  owns  or  has  a  license to such gene, protein, compound, material,
Information  or  intellectual property right and has the ability to grant to the
other  Party  access,  a  license  or a sublicense (as applicable) to such gene,
protein,  compound,  material,  Information  or  intellectual  property right as
provided  for  herein  without  violating  the  terms  of any agreement or other
arrangements with any Third Party existing at the time such Party would be first
required  hereunder to grant the other Party such access, license or sublicense.

     1.12  "COST  OF  GOODS  SOLD"  means  [  *  ].

     1.13  "COST  OF  MANUFACTURE"  means  [  *  ].

     1.14  "DEVELOPMENT"  means  those  activities  undertaken with respect to a
Product  that  are  directed  toward  obtaining  Regulatory  Approval  and  the
pre-marketing, marketing research, marketing and sale of such Product, including
without  limitation,  humanization, cell line optimization, pre-clinical testing
and  toxicology  studies,  human  clinical trials, formulation, bulk production,
fill/finish, manufacturing process development, manufacturing scale-up costs and
validation,  qualification and certification costs and preparation of regulatory
filings.

     1.15  "DEVELOPMENT PLAN" means the plan describing the Development intended
to  be  conducted for a given Co-Funded Product, including an estimated schedule
and  budget,  as  such  plan  may  be  amended by the relevant Joint Development
Committee  from  time  to  time.

     1.16  "DEVELOPMENT  COSTS"  means  [  *  ].

     1.17 "DILIGENT EFFORTS" means the carrying out of obligations or tasks in a
sustained  manner  consistent with the efforts a Party devotes to a product or a
research,  development  or marketing project of similar market potential, profit
potential  or  strategic value resulting from its own research efforts, based on
conditions  then  prevailing  and taking into account its relative risk profile,
time  to  market, and other factors considered in portfolio management. Diligent
Efforts  requires  that  the  Party: (i) promptly assign responsibility for such
obligations  to  specific  employee(s)  who monitor such progress on an on-going
basis,  (ii)  set  and  consistently  seek  to  achieve  specific and meaningful
objectives  for  carrying  out  such  obligations,  and (iii) allocate resources
designed  to  advance  progress  with  respect  to  such  objectives.

     1.18  "DRUG  APPROVAL  APPLICATION"  means  an  application  for Regulatory
Approval  required  before  commercial  sale  of  a  Product as a pharmaceutical
product  in  a  regulatory  jurisdiction.

     1.19  "EXEL  DIAGNOSTIC  PRODUCT"  means  [  *  ].

     1.20  "EXEL  KNOW-HOW"  means all Information Controlled by EXEL during the
term  of  the  Agreement  that  is necessary or reasonably useful for PDL (a) to
fulfill  its  obligations  under the Research Plan, or (b) to research, develop,
use,  import,  manufacture, market or sell Antibodies or Products, but excluding
the  EXEL  Patents.

     1.21  "EXEL  PATENTS"  means  all  (i)  unexpired letters patent (including
inventor's  certificates) which have not been held invalid or unenforceable by a
court  of  competent  jurisdiction from which no appeal can be taken or has been
taken  within  the  required  time  period,  including  without  limitation  any
substitution,  extension,  registration,  confirmation, reissue, re-examination,
renewal,  patent  of  addition  or  any  like  filing  thereof  and (ii) pending
applications  for letters patent, including without limitation any continuation,
division,  or  continuation-in-part  thereof  and  any  provisional applications
Controlled  by  EXEL  related  to  Targets  or  Antibodies,  including  the
identification and generation of Antibody Target Candidates and Antibody Targets
for  use  in identifying and generating Antibodies, including but not limited to
issued  patents  and  pending applications that claim the composition of matter,
manufacture,  import  or  use  of  a Target, Antibody Target Candidate, Antibody
Target, Antibody or Product, which are filed prior to or during the term of this
Agreement in the United States or any foreign jurisdiction. "EXEL Patents" shall
not  include  Joint Patents or PDL Patents or, after assignment to PDL, Antibody
Patents.

     1.22  "EXEL  PRODUCTS" means those Products which previously were Co-Funded
Products,  but  which  EXEL  has  assumed  responsibility  for  Development  and
commercialization  as  described  in  Section  5.9(c).

     1.23 "FIRST COMMERCIAL SALE" means the first sale of the applicable Product
to  a  Third  Party  following Regulatory Approval of the Product in the country
where  sold.

     1.24  "HUMANIZED ANTIBODY" means [ * ] pursuant to this Agreement by [ * ].
The  term  "Humanized  Antibody"  shall  include,  without  limitation  [  *  ].

     1.25  "INDEPENDENT  RESEARCH"  means  [  *  ].

     1.26  "IND" means an Investigational New Drug Application as defined in the
current  Federal  Food,  Drug  and  Cosmetic  Act  and  applicable  regulations
promulgated  thereunder  by  the  FDA  or  the  equivalent  application  to  the
equivalent  agency in any other regulatory jurisdiction, as amended from time to
time during the term of this Agreement, and any equivalent application or filing
for  diagnostics  or  medical  devices.

     1.27  "INFORMATION"  means  information,  results  and  data  of  any  type
whatsoever,  in  any  tangible  or intangible form whatsoever, including without
limitation,  databases,  inventions,  practices,  methods,  techniques,
specifications,  formulations, formulae, knowledge, know-how, skill, experience,
test  data  including  pharmacological,  biological,  chemical,  biochemical,
toxicological  and  clinical  test  data,  analytical  and quality control data,
stability  data,  studies and procedures, and patent and other legal information
or  descriptions.

     1.28 "INVENTIONS" means any and all inventions, results, know-how and other
Information, and all intellectual property relating thereto, made, discovered or
developed  by  one  or  more  Parties  and their employees or agents (including,
without  limitation,  consultants  or  contractors  who  have assigned rights to
inventions  to a Party) pursuant to work performed under the Collaboration or in
the  course  of  developing  a  Pre-Opt-In  Product or developing or marketing a
Co-Funded  Product.

     1.29  "JOINT  INVENTIONS" means any and all Inventions (other than Antibody
Inventions)  made  jointly  by  employees  or agents of both Parties (including,
without  limitation,  consultants  or  contractors  who  have assigned rights to
inventions  to  a  Party), as determined in accordance with United States patent
laws.

     1.30  "JOINT  PATENTS"  means  all  (i) unexpired letters patent (including
inventor's  certificates) which have not been held invalid or unenforceable by a
court  of  competent  jurisdiction from which no appeal can be taken or has been
taken  within  the  required  time  period,  including  without  limitation  any
substitution,  extension,  registration,  confirmation, reissue, re-examination,
renewal,  patent  of  addition  or  any  like  filing  thereof, and (ii) pending
applications  for letters patent, including without limitation any continuation,
division,  or  continuation-in-part  thereof  and  any  provisional applications
claiming  Joint Inventions, which are filed during the term of this Agreement in
the United States or any foreign jurisdiction. "Joint Patents" shall not include
EXEL  Patents  or  PDL  Patents  or  Antibody  Patents.

     1.31  "MODEL  SYSTEM  TARGETS"  means  [  *  ].

     1.32 "NET SALES" means [ * ]. In the case of Combination Products for which
a  Product and each of the other therapeutically active ingredients contained in
the Combination Product have established market prices when sold separately, Net
Sales shall be determined by multiplying the Net Sales for each such Combination
Product  by  a  fraction, the numerator of which shall be the established market
price  for  the  Product(s)  contained  in  the  Combination  Product,  and  the
denominator  of  which shall be the sum of the established market prices for the
Product(s)  plus  the  other  active  ingredients  contained  in the Combination
Product.  When such separate market prices are not established, then the Parties
shall  negotiate  in good faith to determine the method of calculating Net Sales
for  Combination  Products.

     If  PDL,  its Affiliates or sublicensees receive non-cash consideration for
any  Product  sold  or  otherwise  transferred to a Third Party, the fair market
value  of  such  non-cash  consideration on the date of the transfer as known to
PDL,  or  as  reasonably  estimated  by PDL if unknown, shall be included in the
definition  of  Net  Sales.  EXEL shall have a right to review the basis of such
determination  and  upon  written  notice,  audit  such estimates as provided in
Section  9.16.

     1.33  "ONCOLOGY  SCREENS"  shall  have  the  meaning  [  *  ].

     1.34  "OPT-IN  PERIOD"  shall  have  the  meaning set forth in Section 5.1.

     1.35  "PATENTS" means EXEL Patents, PDL Patents and/or Joint Patents as the
context  requires.

     1.36  "PDL  DIAGNOSTIC  PRODUCT"  means a product that is being or has been
developed  for  [  *  ]  for  use  with  a  [  *  ].

     1.37 "PDL KNOW-HOW" means all Information Controlled by PDL during the term
of  the Agreement that is necessary or reasonably useful for EXEL to (a) fulfill
its  obligations  under  the  Research  Plan,  or  (b)  develop,  import,  use,
manufacture,  market  or  sell  EXEL Products, but excluding the PDL Patents and
excluding  all  Information  Controlled  by PDL that relates to antibodies other
than  EXEL  Products  (including,  without  limitation,  general methods for the
humanization  or  manufacture  of  antibodies), except to the extent the Parties
agree  pursuant  to  Section  5.9(c).

     1.38  "PDL  PATENTS"  means  all  (i)  unexpired  letters patent (including
inventor's  certificates) which have not been held invalid or unenforceable by a
court  of  competent  jurisdiction from which no appeal can be taken or has been
taken  within  the  required  time  period,  including  without  limitation  any
substitution,  extension,  registration,  confirmation, reissue, re-examination,
renewal,  patent  of  addition  or  any  like  filing  thereof  and (ii) pending
applications  for letters patent, including without limitation any continuation,
division,  or  continuation-in-part  thereof  and  any provisional applications,
Controlled  by  PDL  related to the development of Antibodies, including but not
limited  to  applications  that claim the composition of matter, manufacture, or
use  of  a  Target,  Antibody  or Product, which are issued or filed prior to or
during  the  term  of  this  Agreement  in  the  United  States  or  any foreign
jurisdiction.  "PDL Patents" shall not include Joint Patents or EXEL Patents or,
until  assigned  to  PDL,  Antibody  Patents.

     1.39  "PDL  PRODUCT" means any Product developed under this Agreement which
(a)  [  *  ],  or  (b)  [  *  ].

     1.40  "PHASE  III  CLINICAL  TRIAL"  means a trial on sufficient numbers of
patients that is designed to establish that a pharmaceutical product is safe and
efficacious  for  its  intended  use,  and  to  define warnings, precautions and
adverse  reactions  that  are  associated with the pharmaceutical product in the
dosage  range  to  be  prescribed,  and  to  support Regulatory Approval of such
pharmaceutical  product  or  label  expansion  of  such  pharmaceutical product.

     1.41  "PRECURSOR  ANTIBODY" means [ * ] pursuant to this Agreement from [ *
].  The  term  "Precursor  Antibody"  shall  include,  without limitation [ * ].

     1.42  "PRE-OPT-IN  PRODUCT"  means  a Product for which EXEL has not made a
decision  under  Section  5.1 whether to co-fund and for which the Opt-In Period
has  not  expired.

     1.43  "PRODUCT"  means  any  therapeutic  or prophylactic product developed
under  this  Agreement,  for  [  *  ],  incorporating  [  *  ].

     1.44  "PRODUCT  PROFIT" means the profit or loss for a particular Co-Funded
Product  for  a  particular  period  calculated  as  described  in  Exhibit  B.

     1.45  "REGULATORY  APPROVAL"  means  any  and  all  approvals  (including
supplements,  amendments,  pre-  and  post-approvals,  pricing and reimbursement
approvals),  licenses,  registrations  or  authorizations  of  any  national,
supra-national  (e.g.,  the  European  Commission or the Council of the European
Union),  regional,  state  or  local  regulatory  agency,  department,  bureau,
commission,  council  or  other  governmental entity, that are necessary for the
manufacture,  distribution,  use  and  sale  of  a  Product  in  a  regulatory
jurisdiction.

     1.46  "RESEARCH  FUNDING"  means  the research funding and license payments
made  by  PDL  to  EXEL  as  described  in  Section  9.2.

     1.47  "RESEARCH  PLAN"  means  the  research  plan describing the goals and
activities  to  be  conducted through the stage of Precursor Antibody evaluation
during  the  Research  Term,  including initially a detailed description of such
goals  and  activities  for  the  first  year of the Research Term and a general
description  of  the  goals  and  intended  activities  for the remainder of the
Research  Term,  as  such  plan is amended from time to time during the Research
Term in accordance with Section 3.1(b). The Research Plan, including any amended
Research  Plan,  shall  be  attached  as  Exhibit  A.

     1.48 "RESEARCH TERM" means the period commencing on [ * ] and ending on the
termination  [  *  ].

     1.49  "SOLE  INVENTIONS"  means any and all Inventions (other than Antibody
Inventions)  made, discovered or developed solely by one Party and its employees
or  agents  (including,  without limitation, consultants or contractors who have
assigned  rights  to  inventions  to  a  Party).

     1.50 "TARGET(S)" means [ * ]. The term "Target(s)" shall include [ * ], but
shall  exclude  [  *  ].

     1.51  "TARGET  POOL"  means  [  *  ]  whenever  identified,  [  *  ].

     1.52  "THIRD PARTY" means any entity other than (i) EXEL, (ii) PDL or (iii)
an  Affiliate  of  either  of  them.

     1.53  "THIRD  PARTY  ROYALTY"  means  any  royalty  paid  by  a Party or an
Affiliate  to  a  Third Party in respect of the manufacture, importation, use or
sale  of  a  Product.

2.     THE  COLLABORATION  RELATIONSHIP

     2.1     OVERVIEW.  PDL  and  EXEL  will  collaborate  to identify, develop,
market  and  sell antibodies for use in the diagnosis, prophylaxis and treatment
of  one  or more [ * ] cancerous conditions.  EXEL will conduct activities under
the Research Plan to identify Targets and will present all such Targets to PDL [
*  ].  Targets  will  be  analyzed  [ * ].  [ * ] conduct preclinical testing in
preparation  for an IND and develop a Development Plan for any Product for which
PDL  intends to file an IND.  If EXEL elects to co-fund one or more Products [ *
]

3.     MANAGEMENT  OF  THE  COLLABORATION

     3.1  JOINT  SCIENTIFIC  COMMITTEE.

          (A)  MEMBERSHIP. [ * ] the Effective Date, the Parties shall establish
a  Joint  Scientific Committee (the "JSC") to oversee the research activities of
EXEL  and  PDL  under  the  Research  Plan.  The  JSC  shall be composed of four
representatives,  two  members  appointed  by  each  of  the  Parties.  One
representative  from  each Party on the JSC shall be the individual at the Party
with  primary  responsibility  for the management of the Collaboration.  Initial
designees  shall  be  Geoff  Duyk and Greg Plowman on behalf of EXEL and William
Benjamin and Max Vasquez on behalf of PDL.  Each Party may replace its appointed
JSC  representatives  at  any time upon written notice to the other Party.  EXEL
shall  designate  one  of its representatives as Chairperson of the JSC, and PDL
shall designate one of its representatives as Vice-Chairperson.  The Chairperson
shall  be  responsible  for  scheduling meetings and preparing and circulating a
draft  agenda  in  advance  of  each  meeting.  Any member may add topics to the
agenda.  The  Vice-Chairperson  shall  be  responsible for preparing and issuing
minutes  of  each  meeting  within  thirty  (30)  days  thereafter.

          (B)  RESPONSIBILITIES.  During  the  [  *  ],  the JSC shall meet on a
quarterly basis as provided in Section 3.5. Following the Research Term, the JSC
shall  meet  on  a quarterly basis for [ * ] for the purposes of winding down or
completing work [ * ]. [ * ] may elect to continue to work in the same manner as
described  in  the Research Plan on [ * ] and [ * ] on a case-by-case basis. For
those [ * ] for which [ * ] continues to conduct such work and that complete the
stage  of  in  vitro  and  in vivo validation as described in Section 2.7 of the
Research  Plan  (to  the  extent  specified by the JSC), for each such resulting
Product,  the Opt-In Decision as set forth in Section 5.1 (i.e., EXEL's right to
co-fund)  shall  survive;  otherwise, such rights shall terminate. The JSC shall
operate [ * ] and in accordance with the principles set forth in this Article 3.
The  JSC  shall: (i) evaluate the data generated by the Parties in the course of
the  Collaboration,  (ii)  decide  what  research  activities  the Parties shall
perform  on  Targets  or Precursor Antibodies under the Collaboration, except as
provided  in Section 4.2, and (iii) review and amend the Research Plan from time
to  time  as appropriate, including not less than an annual review to detail the
activities  and  goals for the upcoming year; provided that any amendment of the
Research  Plan that varies any material terms of this Agreement shall be subject
to  Section  15.4,  which  requires  that any such amendment shall be reduced to
writing  and  signed  by  an  authorized  officer  of  each  Party.


     3.2  JOINT  PATENT  COMMITTEE.  Within [ * ] the Effective Date, a Joint
Patent Committee (the "JPC") shall be formed.  The JPC, in consultation with the
JSC,  will devise a strategy for the protection of intellectual property arising
from  the  Collaboration, including Antibody Target Candidates, Antibody Targets
and  Antibody  Inventions, and will supervise and direct the filing, prosecution
and  maintenance  of  all  Patents  covering  the  Joint  Inventions, as further
described  in  Article  10.  This committee will consist of one member from each
Party's  management  team  or  the  Party's  designated  alternate.  The  PDL
representative will serve as the Chairperson of the JPC. During the term of this
Agreement,  the JPC will meet at [ * ], as provided in Section 3.5, and may hold
additional  meetings  at  the  request  of  either  Party.

     3.3  JOINT  DEVELOPMENT  COMMITTEE.

          (A)  MEMBERSHIP.  [  *  ]  as  EXEL  exercises its option to co-fund a
Product,  as  provided  in  Section  5.1, the Parties promptly shall establish a
Joint  Development  Committee  (a  "JDC")  to  oversee  the  development  and
commercialization  of  that Co-Funded Product. The JDC shall be composed of four
representatives,  two  members  appointed  by  each  of  the  Parties.  One  JDC
representative  from  PDL  shall  be  the  individual  at  PDL  with  primary
responsibility  for the management of the development of the Product. Each Party
may replace its appointed JDC representatives at any time upon written notice to
the  other  Party. PDL shall designate one of its representatives as Chairperson
of  the  JDC,  and  EXEL  shall  designate  one  of  its  representatives  as
Vice-Chairperson.  The  Chairperson shall be responsible for scheduling meetings
and  preparing  and  circulating  an  agenda  in  advance  of  each meeting. The
Vice-Chairperson  shall be responsible for preparing and issuing minutes of each
meeting  within  thirty  (30)  days  thereafter.


          (B)  RESPONSIBILITIES.  During the Development of a Co-Funded Product,
the  JDC  for that Co-Funded Product shall meet on a quarterly basis as provided
in  Section  3.5.  Each  JDC  shall  operate  [  *  ] and in accordance with the
principles set forth in this Article 3. Each JDC shall: (i) oversee the progress
of  the  Development conducted by PDL for its Co-Funded Product, and (ii) review
and  approve  any  material amendments to the Development Plan for its Co-Funded
Product.


     3.4  JOINT  COMMERCIALIZATION  COMMITTEE.

          (A)  MEMBERSHIP.  [  * ] for each Co-Funded Product, the Parties shall
establish  a  Joint  Commercialization  Committee  ("JCC")  for  that  Co-Funded
Product.  The  JCC  shall  be  composed  of  four  representatives,  two members
appointed  by  each of the Parties. One representative from PDL on the JCC shall
be  the  individual at PDL with primary responsibility for the commercialization
of  the Product. Each Party may replace its appointed JCC representatives at any
time  upon  written  notice  to  the other Party. PDL shall designate one of its
representatives  as  Chairperson of the JDC, and EXEL shall designate one of its
representatives  as  Vice-Chairperson.  The Chairperson shall be responsible for
scheduling  meetings  and preparing and circulating an agenda in advance of each
meeting.  The  Vice-Chairperson  shall  be responsible for preparing and issuing
minutes  of  each  meeting  within  thirty  (30)  days  thereafter.


          (B)  RESPONSIBILITIES.  Each  JCC  shall  meet on a quarterly basis as
provided in Section 3.5. Each JCC shall operate [ * ] and in accordance with the
principles  set  forth  in  this  Article 3. Each JCC shall: (i) prepare a basic
commercialization plan, including a launch and marketing plan and budget for the
commercialization  of its Co-Funded Product (the "Commercialization Plan"), (ii)
oversee  the  implementation  of  the  Commercialization  Plan by PDL, and (iii)
review and approve any material amendments to the Commercialization Plan. In any
event,  the  Commercialization  Plan  shall  not  include  detailed  Information
regarding  PDL's implementation of the Plan, including without limitation, sales
force incentives, which shall be in PDL's sole discretion. The Commercialization
Plan shall be prepared taking into consideration such factors as: (i) the use of
Third Party collaborators to develop, market and sell in particular countries or
territories,  (ii)  market  conditions,  (iii)  regulatory  factors,  and  (iv)
competition.  The  Commercialization  Plan  budget  will  include  all projected
additional  Regulatory  Approvals,  and  sales  and  marketing  expenses for the
Co-Funded  Product.


     3.5  MEETINGS.  All  meetings  of  the  JSC, JPC, JDCs and JCCs shall be
held  at the headquarters of either EXEL or PDL (or at any other mutually agreed
upon  location),  on  an  alternating  basis.  Either Party may bring additional
representatives  to  attend  meetings  of  a  particular  committee as nonvoting
observers.  A  meeting  of  a  committee  may  be  held  by  audio  or  video
teleconference  with  the  consent of each Party, provided that at least half of
the  minimum  number  of  meetings  for  that committee shall be held in person.
Meetings  of  a committee shall be effective only if at least one representative
of  each  Party  is  present  or  participating.

     3.6  OBLIGATIONS  OF PARTIES. EXEL and PDL shall provide the JSC, JPC, JDCs
and  JCCs  and  their  authorized  representatives with reasonable access during
regular  business  hours  to all records, documents, and Information relating to
the  Collaboration  which  any such committee may reasonably require in order to
perform its obligations hereunder; provided, however, that if such documents are
under  a  bona fide obligation of confidentiality to a Third Party, then EXEL or
PDL,  as the case may be, may withhold access thereto to the extent necessary to
satisfy  such  obligation, such access not to be unreasonably withheld. EXEL and
PDL  may  also  withhold  documents  relating  to  any  evaluations  of  the
Collaboration,  including  documents relating to evaluating the activities under
this  Agreement  or  relating  to a decision whether to continue a Collaboration
project.

     3.7  COLLABORATION  GUIDELINES.

          (A)  GENERAL.  In  all  matters  related  to the Collaboration and the
development  and marketing of Co-Funded Products, the Parties shall be guided by
standards  of  reasonableness  in  economic  terms  and  fairness to each of the
Parties,  striving  to  balance  as  best  they can the legitimate interests and
concerns of the Parties to further the goals of the Collaboration and to realize
the  economic  potential  of  the  Products.

          (B) [ * ]; DEADLOCKS. The JSC, JPC, JDCs and JCCs shall operate [ * ].
In the  event  of a deadlock within the JSC, the JPC, a JDC or a JCC concerning
anydecision,  such  deadlock  shall  be  resolved  as  follows:

               (I)  JSC  DEADLOCKS.  If a deadlock arises between the members of
the JSC, a non-JSC-member officer of each party shall be advised of the deadlock
in  writing  and  shall  attempt  to provide the JSC with a mutually agreed upon
resolution  within one (1) month. If such resolution is not timely provided, the
Chief  Executive  Officer ("CEO") of each Party shall be advised of the deadlock
in  writing  and  the  deadlock  shall  be  resolved  by mutual agreement of the
Parties'  CEOs within one (1) month after they have been so advised. If the CEOs
do  not  agree  on  a resolution, [ * ] regarding any deadlock concerning target
selection  (i.e.,  whether  a  Target  meets  the  Antibody  Target Candidate or
Antibody  Target  criteria)  and  all  other deadlocks shall be submitted to and
resolved  by binding arbitration pursuant to the Commercial Arbitration Rules of
the American Arbitration Association (the "AAA Rules"). In any event, each Party
shall  submit  a briefing document detailing its position in the deadlock not to
exceed  25 double-spaced 8.5"x11" pages within 10 business days of the selection
of  the  arbitrator,  and  the  arbitrator  shall  be  instructed  to  make such
determination  within  30 days of submission of both position papers, but in any
event  not later than 40 days following submission of the matter to arbitration.
The  arbitration  shall  be  held  in  San  Francisco,  California  and shall be
conducted  by one arbitrator who is knowledgeable in the subject matter at issue
and  who  is  selected  by  mutual  agreement  of  the  Parties or, failing such
agreement,  shall  be  selected  according  to  the AAA Rules. In conducting the
arbitration,  the  arbitrator  shall apply the California Rules of Evidence, and
shall  be  able  to  decree any and all relief of an equitable nature, including
without  limitation  such relief as a temporary restraining order, a preliminary
injunction,  a  permanent injunction, and specific performance. Each Party shall
bear  its  respective costs and expenses and the fees of the arbitrator shall be
shared  equally.

               (II)  JPC  Deadlocks. If a deadlock arises between the members of
the  JPC,  the General Counsel of each Party shall be advised of the deadlock in
writing  and  shall  attempt  to  provide  the  JPC  with a mutually agreed upon
resolution  within  one  (1) month. If such resolution is not timely provided by
the  General  Counsels of the Parties, the CEO of each Party shall be advised of
the  deadlock  in writing and the deadlock shall be resolved by mutual agreement
of  the  Parties'  CEOs within one (1) month after they have been so advised. If
the  CEOs  do  not  agree  on  a  resolution,  then  [*].

               (III) JDC DEADLOCKS. If a deadlock arises between the members of
a  JDC,  the  CEO  of each Party shall be advised of the deadlock in writing and
shall  attempt  to provide the JDC with a mutually agreed upon resolution within
one  (1)  month.  If  such  resolution is not timely provided by the CEOs of the
Parties, the deadlock shall be resolved by mutual agreement of the Parties' CEOs
within  one  (1) month after they have been so advised. If the CEOs do not agree
on  a  resolution,  then  [  *  ].

               (IV)  JCC  Deadlocks.  If  a  deadlock  arises  between  the
members  of  a  JCC,  the  CEO of each Party shall be advised of the deadlock in
writing  and  shall  attempt  to  provide  the  JCC  with a mutually agreed upon
resolution  [*].  If  such  resolution  is  not  timely  provided  by  [*]

          (C)  INDEPENDENCE.  Subject  to  the  terms  of  this  Agreement,  the
     activities  and  resources  of  each  Party shall be managed by such Party,
     acting  independently  and  in  its  individual  capacity. The relationship
     between  EXEL  and PDL is that of independent contractors and neither Party
     shall  have  the  power  to bind or obligate the other Party in any manner,
     other  than  as  is  expressly  set  forth  in  this  Agreement.

     4.  COLLABORATION;  HUMANIZATION

     4.1  COLLABORATION.

          (A)  GENERAL.  [ * ], the Parties shall conduct collaborative research
with  the  general  goals  and  objectives  of:  (a) applying EXEL technology to
discover  and characterize Targets that may be useful as tools for the discovery
and  development  of  therapeutic and diagnostic Antibodies for controlling cell
growth,  apoptosis  and proliferation in the diagnosis, prevention, treatment or
cure  of cancer or pre-cancerous conditions, and (b) applying PDL technology [ *
].  Subject to [ * ], the obligations of EXEL described in [ * ] shall terminate
[  *  ].  The rights and obligations of PDL in [ * ] shall terminate as provided
for  in [ * ]. The obligations of PDL in [ * ] shall continue until the later of
(i)  the  [ * ] or (ii) the time [ * ]. The details of the Collaboration are set
forth  below  and in the Research Plan. In the event of any conflict between the
provisions  of  this Agreement and those of the Research Plan, the provisions of
this  Agreement  shall  govern.

          (B)  PRESENTATION  OF TARGETS. Promptly after the Effective Date, EXEL
shall  present  to the JSC all Model System Targets and Targets identified prior
to  the Research Term. During the Research Term, EXEL will conduct activities as
described  in  Sections  2.1 and 2.2 of the Research Plan to identify additional
Model  System  Targets  and  Targets  and,  promptly  after identification, will
present  all such additional Model System Targets and Targets to the JSC. [ * ].

          (C) ALLOCATION OF TARGETS TO [ * ]. As described in Section 2.3 of the
Research  Plan,  [ * ] shall conduct [ * ] for each [ * ]. After presentation to
the  JSC  of  the  [  *  ]  and results of such [ * ] for a [ * ], the JSC shall
determine  whether  the  [  *  ]  is  to  be  designated an [ * ] and pursued in
accordance  with  the  Research  Plan.  All [ * ] shall be included in and shall
constitute  the "Work Pool." For each [ * ] determined not to be designated an [
*  ],  then,  promptly  following such determination by the JSC, and in no event
later  than  the  quarterly  JSC meeting following the JSC meeting at which such
determination  was made, [ * ] shall elect, by notifying the JSC, whether such [
*  ] shall be included in the [ * ] (in which case it shall be a [ * ]) or the [
*  ]  (in  which  case  it  shall  be  an  [  *  ]).

          (D) [ * ] [ * ] shall be reserved for possible future inclusion by the
JSC  in  the Work Pool. [ * ] shall have [ * ] license with respect to the [ * ]
as  set forth in [ * ]. [ * ] may designate a maximum number of [ * ] equal to [
*  ]. [ * ] may at any time, by notifying the JSC, elect to re-designate a [ * ]
as  an [ * ], in which event it shall no longer count against the maximum number
of  [  *  ].  The  JSC may designate a [ * ] for out-licensing, in which case it
shall  continue to count as a [ * ] until such time as it is either out-licensed
or re-designated by [ * ] as an [ * ] or re-designated by the JSC to be included
in  the  Work  Pool.
          (E)  [  *  ] [ * ] shall be available for possible future inclusion by
the  JSC  in  the  Work  Pool or by [ * ] in the [ * ] at [ * ] , subject to the
following  limitation: If [ * ] [ * ] in one or more model organisms, other than
[  *  ], either on its own behalf or pursuant to an agreement with a Third Party
Antibody  Collaborator (as defined below) and if [ * ] identifies through such [
*  ]  that  is also a [ * ], then [ * ] shall promptly notify the JSC in writing
that  such [ * ] was identified in a screen outside the Collaboration. If such [
*  ]  is  an [ * ], and if there is a reasonable basis to believe such [ * ] may
have potential in cancer, then no later than the quarterly JSC meeting following
the  JSC meeting at which such notice was provided, the JSC may elect to include
such [ * ] in the Work Pool or [ * ] may elect to include such [ * ]. If neither
the  JSC  nor  [ * ] so elects, then such [ * ] shall be remain in the [ * ] and
shall  be deemed an [ * ] [ * ] shall have [ * ] license with respect to the [ *
]  as  set forth in Section 8.1(b), except that it shall have [ * ] license with
respect  to  any [ * ] in the [ * ] as set forth in Section 8.1(a). "Third Party
Antibody  Collaborator"  shall  mean  a  Third  Party  providing  average annual
research  funding  or  other  non-cash consideration (which shall be fair market
value on the date of transfer if known to [ * ] or, as reasonably estimated by [
*  ]  if  unknown)  of  not  less  than  [ * ] in a designated therapeutic area.

          (F)  [  * ] Each [ * ] shall be available for selection by the JSC for
inclusion  in  the Work Pool until such time as [ * ] notifies [ * ] and the JSC
in writing that either [ * ] or the Third Party Antibody Collaborator has made a
decision  (as  documented  by written records of [ * ]) to begin work to express
and  purify the protein expressed by such [ * ] for purposes of developing a [ *
]. Upon receipt of such notice, [ * ] shall have no further rights to that [ * ]
and  it  shall  cease  to  be  a  [  *  ].

     4.2  HUMANIZED  ANTIBODY GENERATION AND PRECLINICAL TESTING.  [ * ] will
determine  which Precursor Antibodies should be humanized.  If [ * ] decides not
to  humanize a particular Precursor Antibody, then the provisions of Section 7.1
shall  apply  to  that  Precursor Antibody and the provisions of Section 7.2, if
applicable, shall apply to its Target.  [ * ] will generate Humanized Antibodies
for  each  Precursor  Antibody  selected  by  [ * ] and will conduct appropriate
preclinical testing, as determined by [ * ], for preparation of the IND.  If [ *
]  decides  not  to  file an IND for any particular Humanized Antibody, then the
provisions  of  Section  7.3  shall  apply  to  that  Humanized  Antibody.

     4.3  CONDUCT OF RESEARCH. Each Party shall use Diligent Efforts to conduct:
(i)  their  respective tasks, as contemplated under the Research Plan and by the
JSC  (the  "Research"),  and  (ii)  the  Collaboration  and the Research in good
scientific  manner,  and  in  compliance  in  all  material  respects  with  the
requirements  of  applicable laws, rules and regulations and all applicable good
laboratory  practices  to  attempt  to  achieve their objectives efficiently and
expeditiously.

     4.4 RECORDS. Each Party shall maintain complete and accurate records of all
work conducted by it or on its behalf under the Collaboration or pursuant to the
Research  and all Information generated in connection with its efforts under the
Collaboration  or  pursuant  to  the  Research.  Each  Party shall maintain such
records  for  a  period  of [ * ] after the later to occur of (a) the end of the
Research Term, or (b) the termination of all efforts to develop, license, market
or  sell the Product to which such records pertain. Such records shall fully and
properly  reflect all work done and all Information generated in the performance
of the Collaboration or the Research in sufficient detail and in good scientific
manner appropriate for patent and regulatory purposes. Each Party shall have the
right  to review and copy such records of the other Party at reasonable times to
the  extent  necessary  for  such  Party to conduct its research, development or
other  obligations  under  this  Agreement.

     4.5  REPORTS. [ * ], each Party shall report to the JSC not less than [ * ]
and  will  periodically submit to the other Party and the JSC a written progress
report  summarizing  the  Research.

     4.6  SHARING  OF BIOLOGICAL DATA. PDL shall provide EXEL with copies of all
Information  that  is Controlled by PDL and that is generated by or on behalf of
PDL  in the course of the Collaboration. EXEL may use such PDL Information for [
* ]. EXEL shall not [ * ]. EXEL shall provide PDL with copies of all Information
that  is Controlled by EXEL and that is generated by or on behalf of EXEL in the
course  of  the  Collaboration.  PDL  may  use  such  Information  for  [  *  ].

     4.7  RIGHT  TO  ENGAGE THIRD PARTIES FOR COLLABORATION EFFORTS. [ * ] shall
have  the right to grant licenses and sublicenses to Third Parties of its rights
with  respect  to  the  conduct of its portion of the Collaboration, as it deems
necessary  or  advisable,  provided  that  [  *  ].

5.     DEVELOPMENT  AND  MARKETING  OF  CO-FUNDED  PRODUCTS;  EXEL  PRODUCTS

     5.1  DEVELOPMENT  DECISION.  At  such  time  as  PDL  has  substantially
completed  the IND and Development Plan for a Product, PDL shall deliver to EXEL
(i)  such  IND  and  Development  Plan,  and  (ii)  documentation  of historical
Development Costs described in Section 5.2(a), and the budget for such costs, if
any, for that Product.  EXEL shall have [ * ] from the date of PDL's delivery of
the  IND  and  the  Development  Plan  to  review  and  comment  on  the IND and
Development  Plan  ("Opt-In  Period")  [  * ] and to determine whether EXEL will
elect  to co-fund the development and commercialization of that Product ("Opt-In
Decision").  If EXEL decides to co-fund such Product, EXEL shall provide written
notice  to  PDL of its Opt-In Decision, accompanied by the payments specified in
Section 5.2(a) prior to the expiration of the Opt-In Period. Effective as of the
date  of  such  notice,  such Product shall become a "Co-Funded Product" and the
Development  Plan  provided to EXEL shall be deemed agreed to by EXEL unless the
Parties  mutually  agree  in writing on a revised Development Plan.  The Parties
then shall establish a Joint Development Committee to oversee the Development of
the  Co-Funded  Product,  in  accordance  with Section 3.3.  If EXEL does not so
notify  PDL  and  make  such  payments  within  the  Opt-In  Period,  then  EXEL
immediately  shall  return  all  copies of the IND and Development Plan for that
Product  to  PDL.  Thereafter,  that  Product  shall be deemed a PDL Product, as
provided  in  Section  6.1.

     5.2  PAYMENTS FOR CO-FUNDED PRODUCTS. EXEL shall make the following
payments for  each  Co-Funded  Product:

          (A)  INITIAL  PAYMENTS.  [ * ] reimbursement of fifty percent (50%) of
the  Development  Costs  incurred  by PDL through the end of PDL's most recently
ended  fiscal quarter prior to PDL's delivery to EXEL of the IND and Development
Plan  for  that  Product  under  Section  5.1.

          (B) REIMBURSEMENT OF DEVELOPMENT COSTS. Following the initial payments
under  Section 5.2(a), EXEL shall reimburse PDL [ * ] for fifty percent (50%) of
the  Development  Costs  incurred  by  PDL  for each Co-Funded Product. All such
reimbursement  payments  shall be due within thirty (30) days after invoicing by
PDL.

     5.3  DEVELOPMENT PLAN FOR CO-FUNDED PRODUCTS. [ * ] shall provide [ * ] for
all Co-Funded Products. [ * ] shall [ * ] of each Co-Funded Product as described
in  the  [ * ]. [ * ] shall have the right to [ * ]. [ * ] shall have [ * ]. The
JDC  for  each  Co-Funded  Product  shall  carry  out  its  responsibilities, as
described  in  Section  3.3.

     5.4  COMMERCIALIZATION  PLAN FOR CO-FUNDED PRODUCTS. The marketing and sale
of  each  Co-Funded  Product  will  be  governed  by its Commercialization Plan,
prepared  as  described  in  Section  3.4.  PDL  shall  have  the  authority and
responsibility  to  implement  each  Commercialization  Plan.  The  JCC for each
Co-Funded  Product shall carry out its responsibilities, as described in Section
3.4.

     5.5  RIGHT  TO ENGAGE THIRD PARTIES FOR [ * ]. PDL may use Third Parties to
perform portions of its obligations relating to [ * ]. In any material agreement
with a Third Party relating to the Development of a Product, the Party retaining
such  Third  Party shall provide for terms that are consistent with the terms of
this  Agreement  and  the  Party  shall remain liable for the performance of any
obligations  hereunder which it delegates to Third Parties. [ * ] shall have the
right  to  grant  licenses  and  sublicenses to Third Parties of its rights with
respect  to  Co-Funded  Products  as  it  deems  necessary  or advisable for the
Development  and/or  commercialization of Co-Funded Products. [ * ] shall [ * ].

     5.6  INDS AND DRUG APPROVAL APPLICATIONS. [ * ] shall be responsible for
the preparation and filing of, and shall own all regulatory submissions relating
to,  [  *  ] filed in any regulatory jurisdiction. [ * ] shall keep the relevant
JDC  and  JCC informed regarding the schedule and process for the preparation of
Drug  Approval  Applications for Co-Funded Products. [ * ] shall provide a draft
copy  of the initial Drug Approval Application for each Major Market (as defined
in  Section 9.3), and all supplemental Drug Approval Applications for each Major
Market  (e.g.,  for  a  new  indication)  for each Co-Funded Product to EXEL for
review,  to  the  extent practical, prior to their submission to the appropriate
regulatory  authority,  provided,  however,  that  [  *  ]  shall be required to
promptly  review such submission and in any event shall have [ * ] to comment on
such  documents,  [  *  ].

     5.7  RECORDS. Each Party shall maintain complete and accurate records of
all  research  and  development work conducted by it or on its behalf related to
Co-Funded  Products  and  Pre-Opt-In Products, and all Information generated and
Development Costs incurred by it or on its behalf in connection with Development
under this Agreement with respect to Co-Funded Products and Pre-Opt-In Products.
Each  Party shall maintain such records for a period of [ * ] after the later to
occur of (a) the end of the Research Term, or (b) the termination of all efforts
to  develop,  license, market or sell the Product to which such records pertain.
Such  records  shall  fully  and  properly  reflect  all  work performed and all
Information  generated  in  sufficient  detail  and  in  good  scientific manner
appropriate  for patent and regulatory purposes. Each Party shall have the right
to  review  and  copy such records of the other Party at reasonable times to the
extent  necessary  for  such Party to conduct its research, development or other
obligations  under  this  Agreement.

     5.8  REPORTS.  During the term of the Agreement, [ * ] will provide reports
at  the  relevant  JDC  and  JCC meetings summarizing the recent Development and
commercialization  activities  relating  to  each  Co-Funded Product. [ * ] will
provide  [  * ] with summary reports for Pre-Opt-In Products through the JSC or,
after the Research Term, upon request by [ * ], but not more frequently than [ *
].

     5.9  TERMINATION  OF  CO-FUNDING;  OUT-LICENSE  OF  CO-FUNDED  PRODUCTS.

          (A)  VOLUNTARY  TERMINATION  BY  [  * ]. [ * ] shall have the right to
terminate  its  co-funding  obligation for any Co-Funded Product effective [ * ]
after  providing  irrevocable,  written  notice  to  [  *  ] of such election to
terminate.  Upon  the effective date of such termination: (i) such Product shall
be  deemed  a  [  * ] Product, rather than a Co-Funded Product, (ii) the JDC for
such Product shall be disbanded, and (iii) [ * ] shall no longer have any rights
pursuant  to  Section  9.9  to receive a share of Product Profit with respect to
such  Product  but  instead shall receive prospective milestones for events that
occur after the effective date of such termination and royalties on Net Sales of
such  Product  pursuant  to  Article  9.  [  *  ]

          (B)  COMPULSORY TERMINATION BY [ * ]. If [ * ] fails to make a payment
under  Section 5.2 and such payment is not received within [ * ] after notice of
failure  to  pay  by  [ * ], then at [ * ] option, [ * ] shall be deemed to have
terminated  co-funding  effective  [ * ] after the end of such [ * ] period. The
effect  of  such  termination  shall  be  as  described  in  Section  5.9(a).

          (C)  VOLUNTARY  TERMINATION BY [ * ]; [ * ] PRODUCTS. If [ * ] decides
to  terminate the development and/or commercialization of a particular Co-Funded
Product  and  not  to  attempt  to out-license such Co-Funded Product to a Third
Party,  [  *  ] shall have the right to terminate its obligations to develop and
commercialize  that  Co-Funded  Product  effective  [  *  ]  after  providing
irrevocable, written notice to [ * ] of such election to terminate. Within [ * ]
after receipt of such notice, [ * ] shall notify [ * ] in writing whether or not
it  elects  to assume sole responsibility for, and all costs and obligations of,
the  continued  development  and  commercialization of such Product. If [ * ] so
elects,  then  upon  the  effective  date of [ * ] termination: (i) such Product
shall  be  deemed  an  "[ * ]" rather than a Co-Funded Product, (ii) the JDC for
such  Product shall be disbanded, and (iii) promptly after [ * ] election, [ * ]
and  [  * ] shall work together to transfer and assign all regulatory documents,
contracts,  materials  and  Information  to [ * ] or its designees to the extent
necessary  for  [  *  ]  to  assume  such  responsibility.  [  *  ].

          (D) OUT-LICENSING DECISION FOR PRODUCTS AND DIAGNOSTIC PRODUCTS. [ * ]
shall provide [ * ] with written notice of its intent to out-license some or all
of  the  rights for a particular Co-Funded Product and/or its related Diagnostic
Product  to a Third Party (whether or not accompanied by a decision to terminate
the  development  and/or  commercialization  of  a  particular Co-Funded Product
and/or  its  Diagnostic  Product).  [  * ] shall have [ * ] from receipt of such
notice  to  notify  [  *  ]  in  writing that it wishes to exercise its right of
negotiation.  If  [  * ] exercises such right, the Parties shall negotiate for a
period  of  up  to  [  * ] to enter into a license agreement, the terms of which
shall  include  customary  terms  and conditions, including, without limitation,
appropriate signing and licensing fees, milestone payments and royalties. If [ *
] do not enter into a license agreement within such time, [ * ] thereafter shall
have  the  right  to out-license such rights to a Third Party, subject to [ * ].
Upon  [ * ] entering into such a license or sublicense with a Third Party, [ * ]
shall  have  [  * ] and [ * ] shall have [ * ]. All compensation received by the
Parties  from  such Third Party under such license or sublicense (including, but
not limited to, all license fees, milestone payments and royalty payments) shall
be  shared  as  [ * ] by the Parties in accordance with [ * ], provided that all
such  compensation  shall  be  calculated after deductions for Development Costs
incurred  by  either  Party  under  the  agreement  with  the  Third  Party.

6.     DEVELOPMENT  AND  MARKETING  OF  PDL  PRODUCTS

     6.1  PDL  PRODUCTS. If EXEL does not elect to co-fund a Product as provided
in  Article  5,  such Product shall be deemed a PDL Product. PDL shall have sole
control  and  responsibility  for  the  development and commercialization of PDL
Products, and EXEL shall have no further rights with respect to such PDL Product
except  (a)  the right to receive milestone and royalty payments as described in
Sections  9.3,  9.4  and  9.5,  and  (b)  [  *  ].

     6.2  REPORTS.  Upon  written  request by EXEL to PDL during the term of the
Agreement,  but not more frequently than once per calendar year, PDL will submit
to  EXEL  a  written progress report summarizing the status of each PDL Product.

     6.3  RIGHT  OF  NEGOTIATION.  [  *  ].

7.     COMMERCIALIZATION  OF  TARGETS  AND  EARLY-STAGE  PRODUCTS

     7.1  TARGETS  AND  PRECURSOR  ANTIBODIES.  In  the  event  that  (a) any
Targets result from the Collaboration for which Antibodies are not generated for
any reason, or (b) any Precursor Antibodies to a given Antibody Target Candidate
or  Antibody  Target  result  from  the Collaboration, but PDL determines not to
select  any  Precursor  Antibodies to that Antibody Target Candidate or Antibody
Target  for  humanization,  then  the  JSC  may  designate  such  Targets and/or
Precursor  Antibodies for out-licensing ("Out-Licensing Candidates"), [ * ]  [ *
]  shall have [ * ].  All consideration received or to be received from any such
license, including, without limitation, all license fees, milestone payments and
royalties  shall  be  treated  as  [  *  ].

     7.2  [ * ] REVERSION TARGETS. Each Target identified by [ * ] during the
[  *  ] that (a) [ * ] or (b) [ * ], shall revert to [ * ] ("Reversion Targets")
and  shall  not  be treated as Out-Licensing Candidates pursuant to Section 7.1.
Upon a Target becoming a Reversion Target, [ * ] shall have no further rights to
that  Reversion  Target,  it shall cease to be a Target and [ * ] licenses under
this  Agreement  to  that  Reversion  Target  shall  terminate.

     7.3  HUMANIZED ANTIBODIES NOT SELECTED BY [ * ] FOR IND. In the event that
[  *  ]  creates  a  Humanized  Antibody, but decides not to proceed with an IND
filing  for  such  Humanized  Antibody,  then  such  Humanized Antibody shall be
treated  in  the  same  manner  as  a  [  *  ]  Product  is treated under [ * ].

     7.4  GENERAL LICENSING. Subject to Sections 5.9(d) and 6.3, [ * ] shall
have  the  right  to enter into a license or sublicense with any Third Party for
any  or all rights to any Antibody Target Candidates, Antibodies or Products [ *
],  including without limitation any Out-Licensing Candidates. All consideration
received or to be received from any such license, including, without limitation,
all  license  fees,  milestone payments and royalties shall be treated as [ * ],
except  that  any  consideration  for  [  *  ] shall be allocated as provided in
Sections 5.9 and 6.3. Upon [ * ] or the Parties' entering into such a license or
sublicense with a Third Party with respect to any Target, Antibody or Pre-Opt-In
Product,  all  rights  under  Article  5  shall  terminate  with  respect to the
applicable  Product  licensed  to  the  Third  Party.

     7.5  [ * ] REVERSION. Effective [ * ], all [ * ] shall revert to [ * ]. [ *
]  shall  have  no  further  rights  with  respect  to  such  [  *  ].

8.     LICENSES  AND  RELATED  RIGHTS

     8.1  LICENSES  TO  PDL.

          (A)  RESEARCH.  Subject  to  the  terms of this Agreement, EXEL hereby
grants  PDL  a  non-exclusive, worldwide, non-transferable, royalty-free license
for  internal  use  under the EXEL Patents, EXEL Know-How and EXEL's interest in
the  Joint  Patents  to  the  extent  necessary (i) to permit PDL to conduct its
obligations under Article 4 and (ii) to use and characterize Targets, including,
without  limitation,  the  Overlap Targets. The license set forth above includes
the  right  to  sublicense,  subject  to  Sections  4.7  and  5.5.

          (B) PRE-OPT-IN PRODUCTS AND PDL PRODUCTS. Subject to the terms of this
Agreement,  EXEL hereby grants PDL a worldwide, exclusive license, including the
right  to  sublicense, under the EXEL Patents, EXEL Know-How and EXEL's interest
in  the  Joint Patents (i) to use the Targets [ * ] for the purpose of creating,
developing  and  marketing  antibodies  for  commercial  purposes,  (ii)  to use
Antibody Target Candidates and Antibody Targets to make, have made, use, develop
and  test  Antibodies,  and  (iii) to make, have made, use, develop, test, sell,
offer  to  sell, have sold and import Pre-Opt-In Products and PDL Products. Such
license  shall  include  all  human prophylactic and therapeutic indications for
Pre-Opt-In  Products and PDL Products and shall be milestone and royalty-bearing
as set forth in Article 9. The exclusivity of the license set forth in 8.1(b) is
subject  to  EXEL's  retained  rights  under  Sections  8.2  (a)  and  8.5.

          (C)  CO-FUNDED  PRODUCTS. Subject to the terms of this Agreement, EXEL
hereby  grants  PDL a worldwide, co-exclusive license (with EXEL), including the
right  to  sublicense, under the EXEL Patents, EXEL Know-How and EXEL's interest
in  the  Joint  Patents  to  make, have made, use, develop, test, sell, offer to
sell,  have  sold  and import Co-Funded Products. Such license shall include all
human  prophylactic and therapeutic indications and shall involve profit-sharing
with  respect  to  any  such  Product in lieu of royalties and milestones as set
forth  in  Article  9.

          (D)  PDL  DIAGNOSTIC PRODUCTS. Subject to the terms of this Agreement,
EXEL hereby grants PDL a worldwide, co-exclusive license, including the right to
sublicense,  under  the  EXEL  Patents, EXEL Know-How and EXEL's interest in the
Joint  Patents to make, have made, use, develop, test, sell, offer to sell, have
sold  and  import  PDL  Diagnostic  Products. At the time PDL identifies a Third
Party  manufacturer  for  any  such  PDL Diagnostic Product, PDL may request the
co-exclusive  license  be  converted  to  an  exclusive  license.  [  *  ].

          (E)  ANTIBODY INVENTIONS. Subject to the terms of this Agreement, EXEL
hereby  grants  PDL  a  worldwide,  exclusive  license,  including  the right to
sublicense,  under  the Antibody Patents that claim Antibody Inventions invented
solely  or jointly by PDL to practice such Antibody Inventions for all purposes.

     8.2  LICENSES  TO  EXEL.

          (A)  RESEARCH.  Subject  to  the  terms  of this Agreement, PDL hereby
grants  EXEL  a non-exclusive, worldwide, non-transferable, royalty-free license
(without  the  right  to sublicense) for internal use under the PDL Patents, PDL
Know-How  and PDL's interest in the Joint Patents to the extent necessary (i) to
permit  EXEL to conduct its obligations under the Research Plan, and (ii) [ * ].

          (B)  EXEL  PRODUCTS. Subject to the terms of this Agreement, effective
upon  a Product becoming an EXEL Product pursuant to Sections 5.9(c) or 12.2(b),
PDL  hereby  grants to EXEL, a worldwide, license (with the right to sublicense)
under  the  PDL Patents, PDL Know-How and PDL's interest in the Joint Patents to
develop,  make,  have  made, use, sell, offer to sell, have sold and import such
EXEL  Products.  This  license  shall  be subject to any licenses or sublicenses
granted  by  PDL  in accordance with Section 5.9 prior to the license under this
Section  8.2(b)  becoming  effective.  Such  license  shall  include  all  human
prophylactic  and  therapeutic indications and any Diagnostic Products developed
for  use  in  connection  with such prophylactic and therapeutic indications and
shall  be  milestone  and  royalty-bearing  as set forth in Section 5.9(c). Such
license shall be exclusive to the extent of PDL's interest in an Antibody Patent
covering  the  EXEL  Product  and  to  the extent any PDL Patent or Joint Patent
relates  solely  to  such  EXEL  Product;  otherwise  such  license  shall  be
non-exclusive.

          (C)  EXEL DIAGNOSTIC PRODUCTS. Subject to the terms of this Agreement,
effective  upon a Product becoming an EXEL Product pursuant to Section 5.9(c) or
12.2(b),  and  to  the  extent  PDL then has rights to a EXEL Diagnostic Product
developed for use with such EXEL Product, PDL hereby grants to EXEL, a worldwide
license  (with  the right to sublicense) under the PDL Patents, PDL Know-How and
PDL's  interest  in  the  Joint  Patents to develop, make, have made, use, sell,
offer  to  sell, have sold and import such EXEL Diagnostic Product. This license
shall  be  subject  to any licenses or sublicenses granted by PDL, in accordance
with  Section  5.9,  prior  to  the  license  under this Section 8.2(c) becoming
effective. Such license shall include all human diagnostic indications and shall
be  milestone  and  royalty-bearing as set forth in Section 5.9(c). Such license
shall  be  consistent  with  the license granted pursuant to Section 8.2(b) with
respect to the EXEL Product for which the EXEL Diagnostic Product is intended to
be  used.

     8.3  NEGATIVE  COVENANTS.  Each  Party hereby covenants that it will not
practice any technology licensed to it under this Agreement outside the scope of
the  licenses  granted  herein.  Specifically and without limitation, EXEL shall
not, unless expressly permitted elsewhere in this Agreement [ * ], provided that
this  covenant  shall  not  be  interpreted  to  prevent  EXEL  from  [  *  ].

     8.4  EXCLUSIVITY.  EXEL  shall  not  research,  develop  or  commercialize
Products,  except  under  the  terms of this Agreement. Specifically and without
limitation, unless expressly permitted elsewhere in this Agreement, neither EXEL
nor  its  Affiliates  shall: (a) [ * ]; (b) make, have made, use, sell, offer to
sell,  have  sold  or  import such [ * ]; or (c) develop, make, have made, sell,
offer  to sell, have sold or import, a [ * ] until the earlier of either (i) [ *
],  or  (ii)  if  at  any  time  [  * ] following the selection of [ * ]. [ * ].

     8.5  INDEPENDENT  RESEARCH. The Parties acknowledge and agree that EXEL may
use  Information  and  materials that EXEL generates in the course of performing
its  obligations under this Agreement that constitutes general know-how relating
to [ * ] for Independent Research. For clarification, EXEL may use the following
Information  generated by EXEL in the course of performing its obligations under
this  Agreement, for Independent Research: [ * ] EXEL shall have no rights under
this  Agreement  to use PDL Information or materials, or to use or operate under
any  rights  licensed by PDL from Third Parties, for Independent Research or for
development or commercialization of any product or for any purpose other than as
expressly  provided  under  this  Agreement.

9.     COMPENSATION

     9.1  LOAN.  Concurrently  with  the  execution  of  this  Agreement, the
Parties are entering into a Note Purchase Agreement of even date herein pursuant
to  which  PDL will loan EXEL thirty million dollars ($30,000,000) pursuant to a
Convertible  Note.  The  terms  of  such  Convertible  Note  shall  be  governed
exclusively  by  the  Note  Purchase  Agreement  and  related documents executed
pursuant  thereto.

     9.2  RESEARCH FUNDING. Subject to Sections 12.2 and 12.3, for the first two
(2)  years  of  this  Agreement,  PDL  shall  make  research funding and license
payments  totaling  four  million  dollars  ($4,000,000)  per year. This initial
Research  Term  shall  be  deemed  to  begin on [ * ]. Research Funding shall be
payable in equal [ * ] installments within [ * ] after the beginning of each [ *
]  during  the  term of the Research Funding. The annual Research Funding at the
rate  of  four  million  dollars  ($4,000,000)  per  year shall be [ * ]. If the
Research  Term has been [ * ], then the research funding shall [ * ] at the rate
of  [  *  ]  for  the  following  [  * ]. The Research Term and Research Funding
thereafter  shall  be [ * ] at the rate of four million dollars ($4,000,000) per
year  for  the  [  *  ].

     9.3  MILESTONE  PAYMENTS.  For  each  PDL  Product,  PDL shall pay EXEL the
following  amounts  within  thirty (30) days after each PDL Product achieves the
stated  milestone:

          (A)  [  *  ]  [  *  ]
          (B)  [  *  ]  [  *  ]
          (C)  Upon  first  filing  of  a  BLA  for  the  PDL  Product  [  *  ]
          (D)  Upon  first  Regulatory  Approval  of  the PDL Product in a Major
          Indication  in  a  Major  Market  [  *  ]
          (E)  If  the  PDL Product has not achieved Milestone 9.3(d), upon such
          PDL  Product  achieving sales resulting in cumulative royalty payments
          from  PDL  to  EXEL  under  this  Agreement  of  at  least [ * ] [ * ]

     [ * ] as used in (b) above shall occur at such time as a draft final report
for  the  trial  has  been  written  [  *  ].

     Milestone  payments  shall  be  payable only once, which shall be the first
time  a  milestone  is  achieved. If a milestone for a PDL Product is skipped or
avoided  by  advancing  to  what  would  normally  be  expected  to  be  a later
development  or  regulatory  step, then the milestone that was expected to occur
earlier  shall  be  deemed  to have been achieved at the same time as such later
milestone  is  achieved, and the corresponding payment for both milestones shall
be  due.  For the purposes of milestone payments, all dosage forms, formulations
and  constructs containing an Antibody against the same Antibody Target shall be
deemed  a  single  Product.

     "Major Indication" as used in (d) above means the following: cancers in any
of the following: [ * ]; provided, however, that the PDL Product is [ * ] in the
target  cancer.

     "Major  Market"  as  used  in  (d)  above  means  the United States, United
Kingdom,  Germany,  France,  Italy  or  Japan.

     9.4  Royalty  Payments. For sales of each PDL Product for a prophylactic
or  therapeutic indication by PDL, its Affiliates or sublicensees, PDL shall pay
EXEL  royalties  at  the  following  rates:

            Annual Net Sales of a given PDL Product     Royalty Rate
            ---------------------------------------     ------------
                                      [ * ]

Except  as  set  forth  in Section 9.6, the foregoing royalty rates shall not be
subject  to adjustment or reduction for any reason.  For the purposes of royalty
payments,  all  dosage  forms,  formulations  and constructs containing the same
Antibody  shall be deemed a single Product.  The measure of annual Net Sales set
forth  in  this  Section  9.4  shall be the sum of Net Sales of a particular PDL
Product  in  all  countries  for  each  fiscal  year  of  PDL.

By  way  of example, if in a particular fiscal year, PDL sells two PDL Products,
with  one PDL Product having [ * ] in annual Net Sales and the other PDL Product
having  [  * ] in annual Net Sales, then PDL shall make royalty payments to EXEL
during  that year totaling [ * ] with respect to the first PDL Product and [ * ]
with  respect  to  the  second  PDL  Product  for  that fiscal year, assuming no
adjustments  are  required  pursuant  to  Section  9.6.

     9.5  ROYALTY  PAYMENT  FOR PDL PRODUCT FOR A DIAGNOSTIC INDICATION.  For
sales  of  each  Diagnostic  Product by PDL, its Affiliates or sublicensees, PDL
shall  pay  EXEL  royalties  at  a  rate  equal  to [ * ] of the rate that would
otherwise  apply  under  Sections  6.3  or  9.4 after all adjustments under this
Agreement  to  such  rates.

     9.6  ROYALTY  CREDITS  AND  ADJUSTMENTS.

          (A)  The milestone payments set forth in Section 9.3(b) - (d) shall be
[  *  ].  In  addition,  the amount of [ * ] shall be creditable against royalty
payments  beginning  in the quarter of the [ * ] as set forth in Section 9.4 and
Section  9.5  as  provided  in  Section  9.6(b).

          (B)  [  *  ].  Amounts  paid  by PDL to Third Parties for intellectual
property  applicable to products in addition to PDL Products shall be reasonably
allocated  among  the  products covered under the applicable licenses from Third
Parties. In any event, royalty credits shall not apply to license fees and other
amounts  paid  under  Third  Party licenses prior to the Effective Date. Royalty
credits  may  be  applied against royalties due under Section 9.4 or Section 9.5
with  respect  to  PDL Products, provided that the royalty paid by PDL after the
application  of  any  credit under this Section 9.6(b) shall not, as a result of
such  adjustment,  be  less than [ * ] of the royalty rate which would otherwise
apply  under  Section  9.4  or  Section  9.5  to  such  Products.

          (C)  [  *  ].

          (D)  In  no  event  shall the royalty rate under Section 9.4 for a PDL
Product  be  reduced  pursuant  to  this  Section  9.6  to  less  than  [  *  ].

     9.7  TERM OF ROYALTIES. EXEL's right to receive royalties under Section 9.4
and Section 9.5 shall expire on a country-by-country basis upon the later of (i)
[  *  ]  from  the First Commercial Sale of such PDL Product in such country, or
(ii)  the expiration of the last to expire issued patent within the EXEL Patents
or  Joint  Patents  in such country covering the PDL Product or the manufacture,
use  or  sale  of  such  PDL  Product.

     9.8  ROYALTY  PAYMENT  REPORTS.  All  royalty payments under this Agreement
shall  be  made to EXEL or its designee quarterly within [ * ] following the end
of  each  calendar  quarter  for  which  royalties  are  due  or, in the case of
royalties  from the sales of sublicensees, within [ * ] following the end of the
quarter  in  which  PDL  receives  the royalty report from the sublicensee. Each
royalty  payment  shall  be accompanied by a statement stating the Net Sales, by
country,  of  each  PDL  Product  sold  during  the  relevant  calendar quarter.

     9.9  PROFIT  SHARING  FOR  CO-FUNDED  PRODUCTS.

          (A) SHARE OF PROFITS. PDL shall be entitled to [ * ] of Product Profit
from  the sale of Co-Funded Products and EXEL shall be entitled to [ * ] of such
Product  Profit  until  such  time  as,  and so long as, [ * ] of the cumulative
Product  Profit  for  all  Co-Funded Products equals [ * ] of the amount paid to
EXEL under Section 9.2 (i.e., [ * ]). Whenever cumulative Product Profit exceeds
such  amount,  each  Party  shall be entitled to [ * ] of the subsequent Product
Profit  from  the  sale  of Co-Funded Products. The respective shares of Product
Profit  are  referred  to  below  as  the  "PDL Share" and the "EXEL Share." The
respective  profit  sharing described in this Section 9.9(a) may be adjusted for
particular  Co-Funded  Products  pursuant  to  Section  3.7(b).

          (B)  DETERMINATION  OF  PRODUCT  PROFIT. Within [ * ] after the end of
each  calendar  quarter  following  the  First  Commercial  Sale  of a Co-Funded
Product,  PDL  shall provide EXEL with a statement detailing (i) PDL's Net Sales
and  the  Product  Profit  incurred  or received, as applicable, in the previous
calendar  quarter  with  respect  to each Co-Funded Product, (ii) the cumulative
Product  Profit  for all Co-Funded Products and (iii) the PDL Share and the EXEL
Share  for  that  quarter  (the  "Quarterly  Report").  Such  statement shall be
accompanied  by  appropriate  supporting  information.

          (C)  PAYMENTS.  If  the  Product  Profit for such calendar quarter was
negative,  then  EXEL shall pay the EXEL Share to PDL within [ * ] after receipt
of  the  Quarterly  Report.  If the Product Profit for such calendar quarter was
positive,  then  PDL shall pay the EXEL Share to EXEL within [ * ] after sending
the  Quarterly  Report  to  EXEL.

     9.10  NONREFUNDABLE  PAYMENTS.  Except  as  expressly  provided  in this
Agreement, all payments made by a Party to the other shall be non-refundable and
non-creditable.

     9.11  PAYMENT METHOD. All payments due under this Agreement to a Party
shall be made by bank wire transfer in immediately available funds to an account
designated  by  the  receiving  Party.  All  payments hereunder shall be made in
United  States  dollars.

     9.12  TAXES. Each Party shall pay any and all taxes levied on account of
all  payments  it  receives under this Agreement. If laws or regulations require
that  taxes  be  withheld,  the Party required to withhold will (i) deduct those
taxes  from  the  remittable  payment,  (ii)  pay the taxes to the proper taxing
authority,  and (iii) send evidence of the obligation together with proof of tax
payment  to  the  other  Party  within  [  *  ]  following  that  tax  payment.

     9.13  BLOCKED CURRENCY. In each country where the local currency is blocked
and  cannot  be  removed  from  the  country, royalties or profit share payments
accrued  in  that country shall be paid to the receiving Party in the country in
local  currency  by  deposit  in a local bank designated by the receiving Party,
unless  the  Parties  otherwise  agree.

     9.14  SUBLICENSES. In the event PDL grants licenses or sublicenses to
others  to  sell  PDL Products which are subject to royalties under Section 9.4,
such  licenses  or  sublicenses  shall include an obligation for the licensee or
sublicensee to account for and report its sales of Products on substantially the
same  basis  as  if such sales were Net Sales by PDL, and PDL shall pay to EXEL,
with  respect  to  such  sales,  royalties  as  if such sales of the licensee or
sublicensee were Net Sales of PDL. With respect to such sales of PDL Products by
licensees  or  sublicensees,  PDL  shall be required only to include information
regarding  Net  Sales  reflected  in reports received by PDL during the calendar
quarter  in question. PDL shall use commercially reasonable efforts to cause its
sublicensees to report sales of PDL Products in a manner that will enable PDL to
report  such  Net  Sales  by  licensees  and  sublicensees on a quarterly basis.

     9.15  FOREIGN EXCHANGE. Conversion of sales recorded in local currencies to
United States dollars will be performed in a manner consistent with PDL's normal
practices  used  to  prepare  its  audited financial statements for internal and
external  reporting  purposes,  which  uses  a  mutually  agreed  upon generally
accepted  source  of  published  exchange  rates. It is agreed that the exchange
rates  published by Citibank or the Wall Street Journal for the last banking day
of the quarter shall be acceptable exchange rates; provided that, in the case of
sales  by  sublicensees, the Parties will use the exchange rates provided in the
agreements  between  PDL  and  such  sublicensees.

     9.16  RECORDS; INSPECTION. Each Party shall keep complete and accurate
books  of  account  and  records  for  PDL Products, EXEL Products and Co-Funded
Products,  to be made under this Agreement. Such books and records shall be kept
for at least [ * ] following the end of the calendar year to which they pertain.
Such  records  will  be  open  for  inspection  during such three year period by
independent  accountants, solely for the purpose of verifying payment statements
hereunder.  Such inspections shall be made no more than once each calendar year,
at  reasonable  times and on reasonable notice. Inspections conducted under this
Section  9.16  shall  be  conducted  by  an  independent  Third Party reasonably
acceptable  to  both  Parties.  The  audit  shall be at the expense of the Party
requesting  the  audit, except in the event that the results of the audit reveal
that the audited Party underpaid the Party requesting the audit by [ * ] or more
for  any  period  covered  by  the  audit, in which case the audit fees, and any
unpaid  amounts (plus interest) that are discovered will be paid promptly by the
audited  Party,  and  in any event no later than [ * ] following delivery of the
audit  results  to  the  audited  Party.

     9.17  LATE  PAYMENTS.  Any overdue payments under this Agreement shall bear
interest  at the rate of [ * ], or the highest rate allowed by law, whichever is
less,  commencing  on  the  date  such  payment  is  due  until  paid.

10.     INTELLECTUAL  PROPERTY

     10.1  OWNERSHIP.

          (A)  Except  as otherwise described herein and subject to the licenses
granted  under  this Agreement, each Party shall own the entire right, title and
interest in and to any and all of its Sole Inventions, and Patents covering such
Sole Inventions, except that all Antibody Inventions initially shall be assigned
to  EXEL.  The  Parties intend that during patent prosecution [ * ] (such patent
applications  and any patents that issue with respect to such applications being
referred  to  as  "Antibody Patents"). At the time PDL notifies EXEL pursuant to
Section  5.1  and  thus  commences  the  Opt-In  Period for a particular Product
containing  a particular Antibody, EXEL shall assign to PDL the Antibody Patents
that  cover  that  Antibody.  Following  such  assignment  to  PDL, the assigned
Antibody  Patents  shall  be  treated  as  PDL Patents under this Agreement. (B)
Subject  to  Section  10.1(a) and the licenses granted under this Agreement, PDL
and  EXEL  shall  each  own an undivided one-half interest in and to any and all
Joint  Inventions  and  Joint Patents. The Parties shall have the right to grant
licenses under such Joint Patents only to the extent provided in this Agreement.

     10.2  STRATEGY;  DISCLOSURE.  During  the  Research  Term, each Party shall
submit  a  written  report to the JPC within [ * ] after the end of each quarter
describing any Sole Invention or Joint Invention or Antibody Inventions of which
it became aware during the prior quarter that it believes may be patentable. The
JPC,  in  consultation  with  the  JSC,  shall  decide  whether to file a patent
application for each such Joint Invention, as discussed in Section 10.3. The JPC
shall  establish  the  patent  strategy  for  all  Joint  Inventions,  Antibody
Inventions  and Inventions pertaining to Antibody Target Candidates and Antibody
Targets  arising  from  the  Collaboration,  considering  in  good  faith EXEL's
obligations  to  PDL  and Third Parties relating to patent strategy for Targets.

     10.3  PATENT  PROSECUTION  AND  MAINTENANCE;  ABANDONMENT.

          (A)  SOLE  INVENTIONS. Each Party shall direct the filing, prosecution
and  maintenance  of  all  Patents  covering  its Sole Inventions, to the extent
possible  consistent  with  the  strategy  established  by  the  JPC  for  Joint
Inventions  and consistent with the remaining provisions, as applicable, of this
Section  10.3.

          (B) EXEL PRODUCT PATENTS. EXEL shall prosecute and reasonably maintain
all  of  the patents and applications that qualify as EXEL Patents that claim or
cover  any  Co-Funded  Product or PDL Product or the Antibody Target of any such
Product  ("EXEL  Product  Patents").  If  EXEL  decides  not  to  continue  the
prosecution  or  maintenance  of an EXEL Product Patent in any country, it shall
promptly  advise  PDL  thereof  and,  at  the request of PDL, EXEL and PDL shall
negotiate  in  good  faith  to  determine an appropriate course of action in the
interests  of  both Parties. If the Parties determine that it would be [ * ] for
PDL to assume responsibility for such prosecution or maintenance, then PDL shall
have the right but not the obligation to assume such prosecution or maintenance.
If  the  Parties  do  not  determine  that  it  would be [ * ] for PDL to assume
responsibility for such prosecution or maintenance, then, at PDL's request, EXEL
shall  continue  such  prosecution  or  maintenance,  provided  that,  [  *  ].

          (C)  PDL  PRODUCT PATENTS. PDL shall prosecute and reasonably maintain
all  of  the  patents and applications that qualify as PDL Patents that claim or
cover  any  Co-Funded Product or EXEL Product or the Antibody Target of any such
Product  ("PDL Product Patents"). If PDL decides not to continue the prosecution
or  maintenance of a PDL Product Patent in any country, it promptly shall advise
EXEL  thereof  and, at the request of EXEL, PDL and EXEL shall negotiate in good
faith  to  determine  an  appropriate  course of action in the interests of both
Parties.  If  the  Parties  determine  that it would be [ * ] for EXEL to assume
responsibility  for  such  prosecution  or maintenance, then EXEL shall have the
right  but  not the obligation to assume such prosecution or maintenance. If the
Parties  do  not  determine  that  it  would  be  [  *  ]  for  EXEL  to  assume
responsibility for such prosecution or maintenance, then, at EXEL's request, PDL
shall  continue  such  prosecution  or  maintenance,  provided  that,  [  *  ].

          (D) JOINT INVENTIONS. Each Party will use reasonable efforts to advise
the other of a Joint Invention as provided in Section 10.2 or promptly upon such
Party  becoming  aware  of such Joint Invention. If the Invention is an Antibody
Invention,  it  shall  be  assigned  as provided in Section 10.1(a) and shall be
prosecuted  as  provided  in  Section  10.3(e).  As  soon  as one of the Parties
concludes  that  it  wishes  to  file  a  patent  application  covering  a Joint
Invention,  it  immediately  shall inform the other Party thereof, consult about
the  filing  procedures concerning such patent application, and file such patent
applications  for  the Joint Inventions in such countries as the JPC determines.
For this purpose, such Party will provide the other Party with the determination
of  inventors and scope of claims as early as possible. If a Party is faced with
possible  loss  of  rights  resulting  from  the  delay  necessary  for  such
communication,  such  communications  may  take  place  promptly  after filing a
provisional or convention application. PDL will have the first right of election
to file patent applications for Joint Inventions in any country in the world. If
PDL  declines  to  file  any  such  application  within [ * ] after receipt of a
written  request  to  do  so from EXEL, then EXEL may do so. Regardless of which
Party  files  a  patent  application,  however,  any  claims  covered  by  such
applications  shall be considered as part of the Joint Patents. If the Party who
initially  files  a patent application covering a Joint Invention decides not to
continue  the prosecution or maintenance of such patent application or patent in
general  or  in any particular country, it promptly shall notify the other Party
in  writing  in  reasonably  sufficient time for such other Party to assume such
prosecution  and maintenance, and shall take the necessary steps and execute the
necessary  documents  to  permit  such other Party to assume such prosecution or
maintenance.  The  other  Party  shall  have the right but not the obligation to
assume  such  prosecution  or  maintenance.

          (E)  ANTIBODY  INVENTIONS.  Antibody  Inventions  initially  shall  be
assigned  to  EXEL  as  provided  in  Section  10.1(a). Unless the Parties agree
otherwise,  EXEL  shall  file patent applications for the Antibody Inventions in
such  countries  as  the  JPC  determines.  If  EXEL  declines  to file any such
application  within  [ * ] after receipt of a written request to do so from PDL,
then  PDL  may  do  so. At the time that an application constituting an Antibody
Patent  is  filed,  EXEL  shall  promptly  notify  PDL  in writing in reasonably
sufficient  time  for  PDL  to  assume  the  prosecution and maintenance of that
Antibody  Patent,  and  shall take the necessary steps and execute the necessary
documents  to  permit  PDL  to  assume  such  prosecution or maintenance. If PDL
subsequently  decides  not  to  continue  the  prosecution  or maintenance of an
Antibody  Patent  directed  to  a  Pre-Opt-In  Product,  in  general  or  in any
particular  country,  it  promptly  shall  notify  EXEL in writing in reasonably
sufficient  time  for EXEL to assume such prosecution and maintenance, and shall
take  the  necessary steps and execute the necessary documents to permit EXEL to
assume  such  prosecution  or maintenance. EXEL shall have the right but not the
obligation  to  assume  such  prosecution  or  maintenance.

          (F)  COOPERATION.  At  the  request  of  the  Party  performing  the
prosecution  of  any patent application under this Section 10.3, the other Party
will  cooperate,  in all reasonable ways, in connection with the prosecution and
maintenance  of all such patent applications. Each Party shall make available to
the  other  Party  or  its  respective  authorized  attorneys,  agents  or
representatives  such  of its employees or consultants as the other Party in its
reasonable judgment deems necessary in order to assist such other Party with the
prosecution  and  maintenance  of  such  patents.  Each  Party shall sign or use
commercially  reasonable  efforts to have signed at no charge to the other Party
all  legal  documents  necessary  in  connection  with  such  prosecution  and
maintenance.

          (G)  UPDATES  ON DEVELOPMENTS. The Party performing the prosecution of
any  patent  application under this Section 10.3 shall advise the other Party of
any  substantial  action  or  development  in  the  prosecution  of  such patent
applications and patents, in particular those involving the question of scope or
the  issuance,  rejection,  or  revocation,  of an interference involving, or an
opposition  to  any  such  patent  application or patent. In addition, the Party
filing  a  patent application on a Joint Invention shall provide the other Party
with  (a)  a  draft  of  such  new  patent  application  prior  to  filing  that
application, allowing adequate time for review and comment by the other Party if
possible;  provided,  however,  the filing Party shall not be obligated to delay
the  filing of any patent application; and (b) copies of material correspondence
from patent offices concerning patent applications covering such Joint Invention
and a reasonable opportunity to comment on any material responses, amendments or
submissions  to  be  made to such patent offices. Notwithstanding the foregoing,
PDL  (with  respect  to  PDL  Patents  directed  to PDL Products) and EXEL (with
respect  to  EXEL Patents directed to EXEL Products) shall have no obligation to
advise  or  confer  with  the other Party with respect to such Patents and shall
prosecute,  maintain  or  abandon  such  Patents  in  their  sole  discretion.

          (H)  EXPENSES.  For  any  Patents  that  relate  solely  to  Co-Funded
Products,  all  costs  and  expenses  for the filing, prosecution (including any
interferences,  reissue  proceedings and reexaminations) and maintenance of such
Patents shall be [ * ]. For any other Patents, all such costs and expenses shall
be  [  *  ].

     10.4  ENFORCEMENT  OF  PATENT  RIGHTS.

          (A)  ENFORCEMENT  OF  PDL  PRODUCT  PATENTS.

               (I)  ENFORCEMENT  BY PDL. In the event either Party becomes aware
of  a  suspected  infringement  of  a PDL Product Patent or the institution by a
Third Party of any proceedings for the revocation of, or to invalidate or render
unenforceable,  any PDL Product Patent due to the Third Party having an antibody
product  against the same target as a Co-Funded Product or an EXEL Product, such
Party  shall  notify  the other Party promptly, and following such notification,
the  Parties shall confer. PDL shall have the right, but shall not be obligated,
to  bring  an  infringement  action  or  to  defend  such proceedings at its own
expense,  in its own name and entirely under its own direction and control. EXEL
will  reasonably  assist PDL in such actions or proceedings if so requested, and
will  lend  its  name  to  such  actions  or  proceedings if requested by PDL or
required  by  law  [  *  ].  EXEL  shall  have  the  right to participate and be
represented  in  any  such  suit  by  its  own  counsel  at  its own expense. No
settlement  of  any  such action or defense which restricts the scope or affects
the  enforceability  of  a PDL Product Patent that covers an EXEL Product may be
entered  into  by PDL without the prior consent of EXEL, which consent shall not
be  unreasonably  withheld.

               (II)  ENFORCEMENT  BY EXEL. If PDL elects not to bring any action
for infringement or to defend any proceeding described in Section 10.4(a)(i) and
so  notifies  EXEL,  then, subject to the rights of any Third Party licensors of
such  Patent to PDL, EXEL may bring such action or defend such proceeding at its
own  expense,  in its own name and entirely under its own direction and control.
PDL  will reasonably assist EXEL in any action or proceeding being prosecuted or
defended by EXEL, if so requested by EXEL or required by law at [ * ]. PDL shall
have  the  right  to  participate and be represented in any such suit by its own
counsel  at  its  own expense. No settlement of any such action or defense which
restricts  the scope or affects the enforceability of PDL Patents may be entered
into  by  EXEL  without  the  prior  consent  of PDL, which consent shall not be
unreasonably  withheld.

          (B)  ENFORCEMENT  OF  EXEL  PRODUCT  PATENTS.

               (I)  ENFORCEMENT BY EXEL. In the event either Party becomes aware
of  a  suspected  infringement of an EXEL Product Patent or the institution by a
Third Party of any proceedings for the revocation of, or to invalidate or render
unenforceable, any EXEL Product Patent due to the Third Party having an antibody
product  against  the  same target as a Co-Funded Product or a PDL Product, such
Party  shall  notify  the other Party promptly, and following such notification,
the Parties shall confer. EXEL shall have the right, but shall not be obligated,
to  bring  an  infringement  action  or  to  defend  such proceedings at its own
expense,  in  its own name and entirely under its own direction and control. PDL
will  reasonably assist EXEL in such actions or proceedings if so requested, and
will  lend  its  name  to  such  actions  or proceedings if requested by EXEL or
required  by  law  [  *  ].  PDL  shall  have  the  right  to participate and be
represented  in  any  such  suit  by  its  own  counsel  at  its own expense. No
settlement  of  any  such action or defense which restricts the scope or affects
the  enforceability of an EXEL Product Patent that covers a Co-Funded Product or
PDL  Product may be entered into by EXEL without the prior consent of PDL, which
consent  shall  not  be  unreasonably  withheld.

               (II)  ENFORCEMENT  BY PDL. If EXEL elects not to bring any action
for infringement or to defend any proceeding described in Section 10.4(b)(i) and
so  notifies  PDL,  then,  subject to the rights of any Third Party licensors of
such  Patent to EXEL, PDL may bring such action or defend such proceeding at its
own  expense,  in its own name and entirely under its own direction and control.
EXEL  will reasonably assist PDL in any action or proceeding being prosecuted or
defended  by  PDL,  if  so requested by PDL or required by law [ * ]. EXEL shall
have  the  right  to  participate and be represented in any such suit by its own
counsel  at  its  own expense. No settlement of any such action or defense which
restricts the scope or affects the enforceability of EXEL Patents may be entered
into  by  PDL  without  the  prior  consent  of EXEL, which consent shall not be
unreasonably  withheld.

          (C)  ENFORCEMENT  OF  JOINT  PATENTS.

               (I)  ENFORCEMENT  BY PDL. In the event either Party becomes aware
of  a  suspected  infringement  of  a Joint Patent or the institution by a Third
Party  of  any  proceedings  for  the  revocation of, or to invalidate or render
unenforceable,  any  Joint  Patent,  such  Party  shall  notify  the other Party
promptly,  and  following such notification, the Parties shall confer. PDL shall
have  the right, but shall not be obligated, to prosecute an infringement action
or  to  defend such proceedings at its own expense, in its own name and entirely
under  its  own  direction  and control. EXEL will reasonably assist PDL in such
actions  or  proceedings if so requested, and will lend its name to such actions
or proceedings if requested by PDL or required by law [ * ]. EXEL shall have the
right  to  participate and be represented in any such suit by its own counsel at
its own expense. No settlement of any such action or defense which restricts the
scope  or  affects  the  enforceability  of  a  Joint Patent that covers an EXEL
Product  may  be  entered  into  by PDL without the prior consent of EXEL, which
consent  shall  not  be  unreasonably  withheld.

               (II)  ENFORCEMENT  BY EXEL. If PDL elects not to bring any action
for infringement or to defend any proceeding described in Section 10.4(c)(i) and
so  notifies  EXEL, then EXEL may bring such action or defend such proceeding at
its  own  expense,  in  its  own  name  and entirely under its own direction and
control.  PDL  will  reasonably  assist  EXEL  in any action or proceeding being
prosecuted  or  defended by EXEL, if so requested by EXEL or required by law [ *
].  PDL  shall have the right to participate and be represented in any such suit
by  its  own  counsel  at  its  own expense. No settlement of any such action or
defense  which  restricts  the  scope  or  affects the enforceability of a Joint
Patent  that  covers  a  Co-Funded Product or PDL Product may be entered into by
EXEL  without  the prior consent of PDL, which consent shall not be unreasonably
withheld.

          (D)  GENERAL  PROVISIONS  RELATING  TO  ENFORCEMENT  OF  PATENTS.

               (I)  WITHDRAWAL. If either Party brings such an action or defends
such  a  proceeding under this Section 10.4 and subsequently ceases to pursue or
withdraws  from  such  action  or proceeding, it shall promptly notify the other
Party  and the other Party may substitute itself for the withdrawing Party under
the  terms  of  this  Section  10.4  at  its  own  expense.

               (II)  RECOVERIES.  In the event either Party exercises the rights
conferred  in  this  Section 10.4 and recovers any damages or other sums in such
action,  suit or proceeding or in settlement thereof, such damages or other sums
recovered  shall  first  be  applied  to  all  out-of-pocket  costs and expenses
incurred  by  the  Parties in connection therewith, including attorneys fees. If
such  recovery  is  insufficient  to  cover  all such costs and expenses of both
Parties,  it  shall be shared [ * ]. If after such reimbursement any funds shall
remain  from  such  damages  or other sums recovered, such funds shall be [ * ].

          (E)  EXCLUDED  PATENTS.  Certain patents as identified in Exhibits D-1
and  D-2 relating to background technologies of either EXEL or PDL, shall not be
subject  to  the  provisions  of  Sections  10.3  and  10.4  (a-d).

     10.5  TRADEMARKS;  PRODUCT  PRESENTATION.

          (A)  CO-FUNDED PRODUCTS. PDL shall own all right title and interest in
and  to  all trademarks, trade names, service marks and trade dress specifically
developed  for  and  used  on  or in connection with all Co-Funded Products. PDL
shall  be  responsible for all decisions regarding the trademarks, service marks
and  trade  dress used on and in connection with all Co-Funded Products. PDL and
EXEL  shall each retain sole and exclusive ownership of their own respective and
independently  developed and pre-existing trademarks, trade names, service marks
and  trade  dress,  regardless  of whether such trademarks, trade names, service
marks  and  trade dress are used on or in connection with any Co-Funded Product.
The  JCC shall approve all trademarks and service marks used on or in connection
with  any Co-Funded Products. Subject to applicable laws, rules and regulations,
any  written  or visual promotional or educational materials intended for use in
conjunction  with  Co-Funded  Products  shall  refer  to  both  Parties  (where
practical)  with  substantially  equal  prominence, and all product labeling and
promotional  material  regarding  the  detailing  and promoting of such Products
shall  display  the  names  and  logos  of  PDL  and EXEL (where practical) with
substantially  equal  prominence.

          (B) PDL PRODUCTS. PDL shall own all right title and interest in and to
all  trademarks, service marks and trade dress specifically developed by PDL for
and used on or in connection with all PDL Products. PDL shall be responsible for
all decisions regarding the trademarks, service marks and trade dress used on or
in  connection  with  all  PDL  Products.

          (C)  EXEL PRODUCTS. EXEL shall own all right title and interest in and
to  all trademarks, service marks and trade dress specifically developed by EXEL
for  and  used  on  or  in  connection  with  all  EXEL  Products. EXEL shall be
responsible  for all decisions regarding the trademarks, service marks and trade
dress  used  on  or  in  connection with all EXEL Products. PDL agrees to assign
promptly  any  trademark  rights  for  an  EXEL  Product  to  EXEL.

11.     CONFIDENTIALITY

     11.1  NONDISCLOSURE  OF  CONFIDENTIAL  INFORMATION.  All  written  and oral
Information disclosed by one Party to the other Party pursuant to this Agreement
and  characterized as confidential to the receiving Party shall be "Confidential
Information."  The Parties agree that during the term of this Agreement, and for
a  period of [ * ] after this Agreement expires or terminates, a Party receiving
Confidential Information of the other Party will (i) maintain in confidence such
Confidential  Information  to  the  same  extent  such  Party  maintains its own
proprietary  information  of similar kind and value (but at a minimum each Party
shall  use commercially reasonable efforts), (ii) not disclose such Confidential
Information to any Third Party without prior written consent of the other Party,
and  (iii)  not  use  such Confidential Information for any purpose except those
permitted  by  this  Agreement.

     11.2  EXCEPTIONS.  The  obligations  in  Section  11.1 shall not apply with
respect  to any portion of the Confidential Information that the receiving Party
can  show  by  competent  written  proof:

          (A)  Is  publicly  disclosed by the disclosing Party, either before or
after  it  is  disclosed  to  the  receiving  Party  hereunder;  or

          (B)  Was  known  to the receiving Party, without obligation to keep it
confidential,  prior  to  disclosure  by  the  disclosing  Party;  or

          (C)  Is subsequently disclosed to the receiving Party by a Third Party
lawfully  in  possession thereof and without obligation to keep it confidential;
or

          (D)  Has  been  published  by  a  Third  Party;  or

          (E)  Has  been  independently developed by the receiving Party without
     the  aid,  application  or  use  of  Confidential  Information.

     11.3  AUTHORIZED  DISCLOSURE.  A  Party  may  disclose  the  Confidential
Information  belonging  to  the  other  Party  to  the extent such disclosure is
reasonably  necessary  in  any  of  the  following  instances:

          (A)  Filing  or prosecuting Patents relating to Sole Inventions, Joint
Inventions  or  Products;

          (B)  Regulatory  filings  relating  to  Products;

          (C)  Prosecuting  or  defending  litigation;

          (D)  Complying  with  applicable  governmental  regulations;  or

          (E)  Disclosure, in connection with the performance of this Agreement,
to  Affiliates,  sublicensees,  prospective  licensees,  research collaborators,
employees,  consultants,  or  agents,  each  of whom prior to disclosure must be
bound  by similar obligations of confidentiality and non-use at least equivalent
in  scope  to  those  set  forth  in  this  Article  11.

     The  Parties  acknowledge that the terms of this Agreement shall be treated
as  Confidential  Information of both Parties.  Such terms may be disclosed by a
Party to investment bankers, investors, prospective business partners (including
potential  acquirers  or  acquisition  targets) and potential investors, each of
whom prior to disclosure must be bound by similar obligations of confidentiality
and  non-use at least equivalent in scope to those set forth in this Article 11.
In  addition, if required, a copy of this Agreement may be filed by either Party
with  the  Securities  and  Exchange  Commission.  In  connection  with any such
filing,  the  filing  Party  shall  endeavor to obtain confidential treatment of
economic  and  trade  secret  information and shall consult with the other Party
prior  to  such  filing  with  respect  to  determining  for  which  information
confidential  treatment  should  be  sought.

     11.4  PUBLICITY.  The  Parties  agree  that  the public announcement of the
execution  of  this  Agreement  shall  be substantially in the form of the press
release attached as Exhibit C. Any other news release relating to this Agreement
or  to  the  performance hereunder, shall first be reviewed and approved by both
Parties;  provided,  however,  that  any  disclosure which is required by law as
advised  by the disclosing Party's counsel may be made without the prior consent
of the other Party, although the other Party shall be given prompt notice of any
such legally required disclosure and to the extent practicable shall provide the
other  Party  an  opportunity  to  comment  on  the  proposed  disclosure.

     11.5  PUBLICATIONS.  Neither  Party shall publish or present the results of
studies  carried  out  under  this  Agreement  without the opportunity for prior
review by the other Party. Subject to Section 11.3, each Party agrees to provide
the other Party the opportunity to review any proposed abstracts, manuscripts or
presentations  (including  verbal  presentations)  which  relate  to any Target,
Antibody  or  Product  (excluding  any Product that has become a PDL Product) at
least  [  *  ] prior to its intended submission for publication and agrees, upon
request, not to submit any such abstract or manuscript for publication until the
other Party is given a reasonable period of time to secure patent protection for
any  material  in  such  publication  which  it  believes to be patentable. Both
Parties  understand  that  a reasonable commercial strategy may require delay of
publication  of information for filing of patent applications. The Parties agree
to  review  and  consider delay of publication and filing of patent applications
under  certain  circumstances.  The  JSC  and  JPC will review such requests and
recommend  subsequent  action.  Neither Party shall have the right to publish or
present  Confidential  Information of the other Party that is subject to Section
11.1.  Nothing  contained  in  this Section 11.5 shall prohibit the inclusion of
information  necessary  for  a  patent  application,  except  for  Confidential
Information  of  the  nonfiling  Party,  provided the nonfiling Party is given a
reasonable  opportunity  to  review  the  information  to  be  included prior to
submission  of  such  patent  application.  Any  disputes  between  the  Parties
regarding  delaying  a  publication  or  presentation  to permit the filing of a
patent application shall be referred to the JSC or, for a Co-Funded Product, the
relevant  JDC.

12.     TERM  AND  TERMINATION

     12.1  TERM. This Agreement shall become effective on the Effective Date and
shall  remain  in  effect  until  the  expiration  of the last royalty or profit
sharing  payment  obligation  with  respect  to any Product, as provided in this
Agreement.

     12.2  TERMINATION  FOR  MATERIAL  BREACH.

          (A) ENTIRE AGREEMENT. If either Party breaches any material agreement,
condition  or  covenant  of  this  Agreement, the Note Purchase Agreement or the
Note,  or makes any materially false report to the other Party, the Party not in
breach  may  terminate  this  Agreement  at  its option on [ * ] written notice,
subject to the remaining provisions of this Section 12.2; provided however, that
any  breach  that  relates  only  to  a  particular  Product(s)  or  only to the
activities  under the Collaboration shall be governed by Section 12.2(b) instead
of  this  Section  12.2(a).

          (B) PARTICULAR PRODUCTS OR COLLABORATION. In the case of a breach that
relates  only  to  a  particular  Product(s) or only to the activities under the
Collaboration,  the  non-breaching  Party, at its option on [ * ] written notice
and subject to the remaining provisions of this Section 12.2, may terminate this
Agreement  as  to  the  particular  Product(s)  to  which  such  breach relates,
(provided,  however, that after such time as the breaching Party has first filed
for  Regulatory Approval of a Product, the non-breaching Party may terminate the
breaching  Party's  rights to such Product only in those countries to which such
breach relates) or in the case of a breach relating only to the activities under
the Collaboration, the non-breaching Party may terminate the Collaboration under
this  Agreement, but this Agreement shall continue in full force and effect with
respect  to  all  Products.  In  the  event of a breach by PDL with respect to a
particular  Co-Funded  Product,  then EXEL, as an alternative to terminating the
Agreement  as to such Product as provided above, may instead, on providing [ * ]
written notice to PDL, elect to terminate PDL's rights to such Co-Funded Product
on  the  same  terms  as  if  PDL  had voluntarily terminated its rights to such
Co-Funded  Product  under  Section  5.9(c).

          (C)  RIGHT  TO  CURE. In any notice of breach under this Section 12.2,
the  non-breaching  Party  shall identify the actions or conduct that such Party
considers  to  be  a  material  breach  and  specify conduct or actions that the
notifying  Party  would  consider  to  be  an acceptable cure of such breach. No
termination  of  this  Agreement or the Collaboration or of rights relating to a
particular  Product  or  country pursuant to Section 12.2(a) or (b) shall become
effective unless such breach shall not have been remedied, or steps initiated to
remedy the same to the non-breaching Party's reasonable satisfaction, within [ *
] after written notice thereof to the breaching Party, or, in case the breach is
a  failure  to  make  any  payment  when  due,  within  [ * ] after such notice.

          (D)  DISPUTES.  If  a  Party  gives  notice  of termination under this
Section  12.2  and the other Party disputes whether such notice was proper, then
the  issue  of  whether  this Agreement has been terminated shall be resolved in
accordance with Section 15.1. If, as a result of such dispute resolution process
it  is  determined  that  the  notice  of  termination  was  proper,  then  such
termination  shall be deemed to have been effective on the effective date of the
notice  of  termination. If as a result of such dispute resolution process it is
determined  that  the  notice  of  termination was improper, then no termination
shall  have  occurred  and  this  Agreement  shall  have  remained  in  effect.

     12.3  TERMINATION  OR EXPIRATION OF RESEARCH FUNDING/COLLABORATION. PDL and
EXEL  shall  have  their  respective  rights  to  terminate  Research Funding as
described  in  Section  9.2,  which  shall  have  the  effect of terminating the
Research  Term.  Upon  such termination or upon expiration of the Research Term,
the Collaboration under this Agreement shall terminate, but all other rights and
obligations  under this Agreement shall continue. If either Party terminates the
Collaboration pursuant to Section 12.2, any Research Funding paid by PDL for any
time  period  beyond the effective date of such termination shall be immediately
refunded  by  EXEL  to  PDL.  The termination or expiration of the Collaboration
shall  not  affect  any  rights  of  PDL  to any Targets, Antibodies or Products
resulting  from  the  Collaboration  prior  to  its  termination  or expiration.

     12.4  EFFECT  OF  TERMINATION  OF  ENTIRE AGREEMENT OR RIGHTS TO PARTICULAR
PRODUCT.  Upon termination of this Agreement in its entirety pursuant to Section
12.2(a),  all licenses granted to the breaching Party under this Agreement shall
terminate  and  the  breaching Party shall return to the non-breaching Party all
materials  and  Information  delivered under this Agreement by the non-breaching
Party  to  the  breaching  Party,  except  as  provided  in  Section  12.5. Upon
termination  of  this  Agreement  pursuant  to Section 12.2(b) with respect to a
particular  Product,  all  licenses  granted  to  the breaching Party under this
Agreement  with  respect to that Product (for the countries in which such rights
are  being  terminated)  shall  terminate  and,  if  such termination is for all
countries,  the  breaching  Party  shall  return  to the non-breaching Party all
materials  and  Information  delivered under this Agreement by the non-breaching
Party  to  the  breaching  Party relating to that Product, except as provided in
Section  12.5.

     12.5  INVENTORY. Upon termination of this Agreement in its entirety or with
respect to a particular Product for which Regulatory Approval has been obtained,
the breaching Party shall have all rights necessary to sell within [ * ] of such
termination  any  such  Product  in  its  or  its  Affiliates'  or sublicensee's
inventory  on  the date of such termination, which have not previously been sold
("Inventory");  provided,  however  that  the  breaching  Party  shall  pay  the
royalties  due  on such Inventory and provide related reports in the amounts and
manner  provided  for  in  Article  9.

     12.6  SURVIVAL.

          (A) In the event of termination of this Agreement for any reason other
than  material  breach  pursuant  to Section 12.2, in addition to those Sections
which  by  their terms survive, the following provisions of this Agreement shall
also survive: Articles 1, 5, 6, 7, 8 10, 11, 12, and 15 and Sections 9.3 - 9.17,
14.1  and  14.2.

          (B)  In the event of termination of this Agreement pursuant to Section
12.2,  the  provisions  of  this  Agreement  referenced in Section 12.6(b) shall
survive,  provided,  however,  that any licenses granted under this Agreement in
favor  of  the  breaching Party shall terminate. In such case, the non-breaching
Party  shall  continue  to  hold  the licenses granted hereunder, subject to the
royalties  set  forth  herein.

          (C)  In any event, termination of this Agreement shall not relieve the
Parties  of  any  liability  or  obligation which accrued hereunder prior to the
effective  date of such termination, nor preclude either Party from pursuing all
rights and remedies it may have hereunder or at law or in equity with respect to
any  breach  of  this  Agreement,  nor  prejudice either Party's right to obtain
performance  of  any  obligation.

13.     REPRESENTATIONS  AND  COVENANTS

     13.1  MUTUAL  AUTHORITY.  EXEL  and PDL each represents and warrants to the
other  that  (a)  it  has the authority and right to enter into and perform this
Agreement and (b) its execution, delivery and performance of this Agreement will
not  conflict  in  any material fashion with the terms of any other agreement to
which  it  is  or  becomes  a  party  or  by  which  it  is  or  becomes  bound.

     13.2  REPRESENTATIONS  BY  EXEL.

          (A)  EXEL  [  *  ].

          (B)  To  its  knowledge, EXEL, as of the Effective Date, owns or has a
valid  license  to use all technology it anticipates using in the Collaboration.

     13.3  RIGHTS  IN  TECHNOLOGY. During the term of this Agreement, each Party
will  use Diligent Efforts not to diminish the rights under its Patents or Joint
Patents  granted  to  each  other  herein,  including  without limitation by not
committing  or  permitting any acts or omissions which would cause the breach of
any  agreements  between itself and Third Parties which provide for intellectual
property  rights  applicable  to  the  development,  manufacture, use or sale of
Products.  Each  Party agrees to provide promptly the other Party with notice of
any  such  alleged breach. As of the Effective Date, each Party is in compliance
in  all material respects with any aforementioned agreements with Third Parties.

     13.4  PERFORMANCE BY AFFILIATES. The Parties recognize that each may
perform  some or all of its obligations under this Agreement through Affiliates,
provided,  however, that each Party shall remain responsible and be guarantor of
the  performance by its Affiliates and shall cause its Affiliates to comply with
the  provisions  of  this  Agreement  in  connection  with  such  performance.

14.     INDEMNIFICATION  AND  LIMITATION  OF  LIABILITY

     14.1  INDEMNIFICATION.

          (A)  PDL  PRODUCTS. PDL hereby agrees to defend and hold harmless EXEL
and  its  agents  and  employees  from  and  against  any and all suits, claims,
actions,  demands, liabilities, expenses and/or loss, including reasonable legal
expenses  and  reasonable  attorneys'  fees  ("Losses")  resulting  directly  or
indirectly  from the manufacture, use, testing, handling, storage, sale or other
disposition  of  PDL  Products  by PDL or its Affiliates, agents or sublicensees
except  to  the  extent  such Losses result from the negligence or wrongdoing of
EXEL.

          (B)  EXEL PRODUCTS. EXEL hereby agrees to defend and hold harmless PDL
and  its  agents  and  employees  from  and against any and all Losses resulting
directly  or  indirectly  from the manufacture, use, testing, handling, storage,
sale  or other disposition of EXEL Products by EXEL or its Affiliates, agents or
sublicensees  except  to  the  extent  such Losses result from the negligence or
wrongdoing  of  PDL.

          (C)  GENERAL  INDEMNIFICATION PROVISIONS. In the event that a Party is
seeking indemnification under this Section 14.1, it shall inform the other Party
of  a  claim  as  soon as reasonably practicable after it receives notice of the
claim,  shall  permit  the  other  Party  to assume direction and control of the
defense  of  the  claim  (including  the  right  to  settle the claim solely for
monetary consideration), and shall cooperate as requested by the other Party (at
the  expense  of  the  other  Party)  in the defense of the claim.

          (D)  CO-FUNDED  PRODUCTS.  In  the event of any Losses to either Party
resulting  directly  or indirectly from the manufacture, use, testing, handling,
storage,  sale  or  other  disposition  of Co-Funded Products by either Party or
their  Affiliates,  agents  or  sublicensees,  such  [  *  ] or if no Regulatory
Approval  has  occurred  for  the  Co-Funded  Product,  then such [ * ] for that
Co-Funded  Product.

     14.2  LIMITATION  OF  LIABILITY. EXCEPT AS SPECIFICALLY PROVIDED IN SECTION
14.1, IN NO EVENT SHALL EITHER PARTY, ITS DIRECTORS, OFFICERS, EMPLOYEES, AGENTS
OR  AFFILIATES  BE  LIABLE  TO  THE  OTHER  PARTY  FOR ANY INDIRECT, INCIDENTAL,
SPECIAL,  EXEMPLARY  OR  CONSEQUENTIAL  DAMAGES,  WHETHER  BASED UPON A CLAIM OR
ACTION  OF  CONTRACT,  WARRANTY,  NEGLIGENCE, STRICT LIABILITY OR OTHER TORT, OR
OTHERWISE,  ARISING  OUT  OF  THIS  AGREEMENT.  For clarification, the foregoing
sentence  shall  not  be  interpreted  to  limit or to expand the express rights
specifically  granted  in the sections of this Agreement.

     14.3  PRODUCT  LIABILITY  INSURANCE.  Any  Party developing a Product shall
carry product liability insurance of not less than [ * ]. Such product liability
insurance  shall  be  in  effect  not  later  than the first administration of a
Product  in  humans.  Notwithstanding the foregoing, a Party may self-insure for
product liability claims if the Party then has current assets of at least [ * ].

15.     MISCELLANEOUS

     15.1  DISPUTE  RESOLUTION. In the event of any controversy or claim arising
out of, relating to or in connection with any provision of this Agreement, other
than  a  dispute  addressed  in  Sections  3.7 or 15.3, the Parties shall try to
settle  their  differences  amicably  between themselves first, by referring the
disputed  matter  to  an appropriate Vice President (or higher level officer) of
each  Party  and,  if  not  resolved by such officers, by referring the disputed
matter  to  the  respective Chief Executive Officers of each Party. Either Party
may  initiate  such informal dispute resolution by sending written notice of the
dispute to the other Party, and, within twenty (20) days after such notice, such
representatives of the Parties shall meet for attempted resolution by good faith
negotiations. If such personnel are unable to resolve such dispute within thirty
(30)  days of their first meeting of such negotiations, either Party may seek to
have  such  dispute  resolved  in  any  United States federal court of competent
jurisdiction  and  appropriate venue. The Parties hereby consent to jurisdiction
in  the  United  States federal courts. If, notwithstanding such consent, United
States  federal  courts  would not have proper jurisdiction over a dispute, then
such  dispute  may  be  submitted  to  any state court in the United States with
proper  jurisdiction  and  venue.  The Parties agree that, except as provided in
Section 15.3, any dispute under this Agreement shall be submitted exclusively to
a  state  or  federal  court  in  the  United  States.

     15.2 GOVERNING LAW. Resolution of all disputes arising out of or related to
this  Agreement  or  the performance, enforcement, breach or termination of this
Agreement  and any remedies relating thereto, shall be governed by and construed
under  the substantive laws of the State of California, as applied to agreements
executed  and  performed entirely in the State of California by residents of the
State  of  California,  without  regard  to  conflicts  of  law  rules.

     15.3  PATENTS AND TRADEMARKS. Any dispute, controversy or claim relating to
the  scope,  validity,  enforceability  or  infringement  of  any  Patent rights
covering  the manufacture, use or sale of any Product or of any trademark rights
related  to  any Product shall be submitted to a court of competent jurisdiction
in the territory in which such Patent or trademark rights were granted or arose.

     15.4  ENTIRE  AGREEMENT; AMENDMENT. This Agreement sets forth the complete,
final  and  exclusive  agreement  and  all  the covenants, promises, agreements,
warranties,  representations,  conditions and understandings between the Parties
hereto  and  supersedes  and  terminates all prior agreements and understandings
between  the  Parties. There are no covenants, promises, agreements, warranties,
representations,  conditions  or understandings, either oral or written, between
the  Parties  other  than  as  are  set  forth herein and therein. No subsequent
alteration,  amendment,  change  or  addition to this Agreement shall be binding
upon  the  Parties unless reduced to writing and signed by an authorized officer
of  each  Party.

     15.5  EXPORT  CONTROL.  This  Agreement is made subject to any restrictions
concerning  the  export  of  products  or  technical information from the United
States  or  other  countries which may be imposed upon or related to EXEL or PDL
from  time  to  time.  Each  Party  agrees  that it will not export, directly or
indirectly,  any  technical information acquired from the other Party under this
Agreement or any products using such technical information to a location or in a
manner  that  at  the  time  of  export  requires  an  export  license  or other
governmental approval, without first obtaining the written consent to do so from
the  appropriate  agency  or  other  governmental  entity.

     15.6  BANKRUPTCY.

          (A)  All  rights  and  licenses  granted  under  or  pursuant  to this
Agreement,  including  amendments  hereto, by each Party to the other Party are,
for all purposes of Section 365(n) of Title 11 of the United States Code ("Title
11"),  licenses  of rights to intellectual property as defined in Title 11. Each
Party  agrees  during  the term of this Agreement to create and maintain current
copies  or,  if  not  amenable  to  copying,  detailed  descriptions  or  other
appropriate  embodiments,  to  the  extent  feasible,  of  all such intellectual
property.  If  a  case  is  commenced  by or against either Party (the "Bankrupt
Party")  under  Title  11,  then, unless and until this Agreement is rejected as
provided  in  Title  11,  the  Bankrupt  Party  (in  any  capacity,  including
debtor-in-possession)  and  its  successors  and  assigns  (including,  without
limitation,  a  Title  11  Trustee) shall, at the election of the Bankrupt Party
made  within  sixty (60) days after the commencement of the case (or, if no such
election is made, immediately upon the request of the non-Bankrupt Party) either
(i) perform all of the obligations provided in this Agreement to be performed by
the Bankrupt Party including, where applicable and without limitation, providing
to  the  non-Bankrupt  Party  portions  of such intellectual property (including
embodiments  thereof) held by the Bankrupt Party and such successors and assigns
or  otherwise  available  to  them or (ii) provide to the non-Bankrupt Party all
such  intellectual  property  (including  all  embodiments  thereof) held by the
Bankrupt  Party  and such successors and assigns or otherwise available to them.

          (B)  If  a Title 11 case is commenced by or against the Bankrupt Party
and  this  Agreement  is  rejected  as provided in Title 11 and the non-Bankrupt
Party  elects  to  retain its rights hereunder as provided in Title 11, then the
Bankrupt  Party  (in  any  capacity,  including  debtor-in-possession)  and  its
successors  and  assigns  (including,  without  limitations, a Title 11 Trustee)
shall  provide  to  the  non-Bankrupt  Party  all  such  intellectual  property
(including  all  embodiments  thereof)  held  by  the  Bankrupt  Party  and such
successors  and  assigns  or  otherwise  available  to them immediately upon the
non-Bankrupt  Party's  written  request therefor. Whenever the Bankrupt Party or
any  of  its successors or assigns provides to the non-Bankrupt Party any of the
intellectual property licensed hereunder (or any embodiment thereof) pursuant to
this  Section  15.6,  the non-Bankrupt Party shall have the right to perform the
obligations  of  the  Bankrupt Party hereunder with respect to such intellectual
property,  but  neither  such provision nor such performance by the non-Bankrupt
Party shall release the Bankrupt Party from any such obligation or liability for
failing  to  perform  it.

          (C) All rights, powers and remedies of the non-Bankrupt Party provided
herein  are in addition to and not in substitution for any and all other rights,
powers  and  remedies  now or hereafter existing at law or in equity (including,
without  limitation,  Title  11)  in the event of the commencement of a Title 11
case  by  or  against the Bankrupt Party. The non-Bankrupt Party, in addition to
the  rights,  power and remedies expressly provided herein, shall be entitled to
exercise  all other such rights and powers and resort to all other such remedies
as  may  now  or  hereafter  exist  at  law  or  in  equity  (including, without
limitation,  under  Title  11) in such event. The Parties agree that they intend
the  foregoing  non-Bankrupt  Party  rights  to  extend  to  the  maximum extent
permitted  by law and any provisions of applicable contracts with Third Parties,
including  without  limitation for purposes of Title 11, (i) the right of access
to any intellectual property (including all embodiments thereof) of the Bankrupt
Party  or  any  Third Party with whom the Bankrupt Party contracts to perform an
obligation  of  the Bankrupt Party under this Agreement, and, in the case of the
Third  Party,  which  is  necessary  for  the  development,  registration  and
manufacture  of Products, and (ii) the right to contract directly with any Third
Party  described  in  Section  15.6(c)(i)  to  complete the contracted work. Any
intellectual  property  provided pursuant to the provisions of this Section 15.6
shall  be  subject  to  the licenses set forth in this Agreement and the payment
obligations  of  this  Agreement,  which  shall  be  deemed  to be royalties for
purposes  of  Title  11.

     15.7  FORCE  MAJEURE. Both Parties shall be excused from the performance of
their  obligations  under  this Agreement to the extent that such performance is
prevented  by force majeure and the nonperforming Party promptly provides notice
of  the prevention to the other Party. Such excuse shall be continued so long as
the  condition  constituting force majeure continues and the nonperforming Party
takes  reasonable  efforts  to  remove  the  condition.  For  purposes  of  this
Agreement,  force  majeure  shall  include  conditions beyond the control of the
Parties,  including  without limitation, an act of God, voluntary or involuntary
compliance  with  any  regulation,  law  or  order of any government, war, civil
commotion,  labor  strike  or  lock-out,  epidemic, failure or default of public
utilities  or common carriers, destruction of production facilities or materials
by  fire,  earthquake, storm or like catastrophe; provided, however, the payment
of invoices due and owing hereunder shall not be delayed by the payer because of
a  force  majeure  affecting  the  payer.

     15.8  NOTICES.  Any  notice  required  or  permitted to be given under this
Agreement  shall  be  in writing, shall specifically refer to this Agreement and
shall  be  deemed  to  have  been sufficiently given for all purposes if sent by
express  delivery service or personally delivered, or by facsimile or electronic
mail  and  confirmed by first class mail. Unless otherwise specified in writing,
the  mailing  addresses  of  the  Parties  shall  be  as  described  below.

     For  EXEL:                   Exelixis, Inc.
                                  170 Harbor Way
                                  P.O. Box 511
                                  South San Francisco, CA  94083-0511
                                  Attention:  Chief  Executive  Officer

     With  a  copy  to:           Cooley  Godward  LLP
                                  Five  Palo  Alto  Square
                                  3000  El  Camino  Real
                                  Palo  Alto,  CA  94306-2155
                                  Attention:  Robert  L.  Jones,  Esq.

     For  PDL:                    Protein  Design  Labs,  Inc.
                                  34801  Campus  Drive
                                  Fremont,  CA  94555-3606
                                  Attention:  Chief  Executive  Officer

     With  a  copy  to:           Protein  Design  Labs,  Inc.
                                  34801  Campus  Drive
                                  Fremont,  CA  94555-3606
                                  Attention:  General  Counsel

     15.9  CONSENTS  NOT UNREASONABLY WITHHELD OR DELAYED. Whenever provision is
made in this Agreement for either Party to secure the consent or approval of the
other,  that  consent or approval shall not unreasonably be withheld or delayed,
and whenever in this Agreement provisions are made for one Party to object to or
disapprove  a  matter,  such  objection or disapproval shall not unreasonably be
exercised.

     15.10  UNITED  STATES DOLLARS. References in this Agreement to "Dollars" or
"$"  shall  mean  the  legal  tender  of  the  United  States.

     15.11  NO STRICT CONSTRUCTION. This Agreement has been prepared jointly and
shall  not  be  strictly  construed  against  either  Party.

     15.12  ASSIGNMENT.  Neither  Party may assign or transfer this Agreement or
any  rights  or  obligations  hereunder without the prior written consent of the
other,  except  a  Party  may  make such an assignment without the other Party's
consent  to  an Affiliate or to a successor to substantially all of the business
of  such  Party,  whether  in  a  merger, sale of stock, sale of assets or other
transaction.  Any  permitted  successor or assignee of rights and/or obligations
hereunder  shall, in writing to the other Party, expressly assume performance of
such rights and/or obligations. Any permitted assignment shall be binding on the
successors  of  the  assigning  Party. Any assignment or attempted assignment by
either  Party  in violation of the terms of this Section 15.12 shall be null and
void  and  of  no  legal  effect.

     15.13  ELECTRONIC  DATA  INTERCHANGE.  If  both Parties elect to facilitate
business  activities  hereunder  by electronically sending and receiving data in
agreed  formats  (also  referred  to as Electronic Data Interchange or "EDI") in
substitution for conventional paper-based documents, the terms and conditions of
this  Agreement  shall  apply  to  such  EDI  activities.

     15.14  COUNTERPARTS.  This  Agreement  may  be  executed  in  two  or  more
counterparts,  each  of  which  shall  be  deemed  an original, but all of which
together  shall  constitute  one  and  the  same  instrument.

     15.15  FURTHER  ACTIONS.  Each  Party  agrees  to  execute, acknowledge and
deliver  such  further  instruments,  and  to  do all such other acts, as may be
necessary  or  appropriate in order to carry out the purposes and intent of this
Agreement.

     15.16  SEVERABILITY. If any one or more of the provisions of this Agreement
is  held  to  be invalid or unenforceable by any court of competent jurisdiction
from  which  no  appeal  can  be  or is taken, the provision shall be considered
severed  from  this  Agreement  and  shall not serve to invalidate any remaining
provisions  hereof.  The  Parties  shall make a good faith effort to replace any
invalid  or  unenforceable  provision with a valid and enforceable one such that
the  objectives  contemplated by the Parties when entering this Agreement may be
realized.

     15.17  AMBIGUITIES.  Ambiguities,  if  any,  in this Agreement shall not be
construed  against  any Party, irrespective of which Party may be deemed to have
authored  the  ambiguous  provision.

     15.18 HEADINGS. The headings for each article and section in this Agreement
have  been  inserted  for  convenience of reference only and are not intended to
limit  or  expand  on  the  meaning  of the language contained in the particular
article  or  section.

     15.19  NO  WAIVER.  Any  delay  in  enforcing  a  Party's rights under this
Agreement  or  any  waiver  as to a particular default or other matter shall not
constitute  a  waiver  of  such  Party's rights to the future enforcement of its
rights  under this Agreement, excepting only as to an express written and signed
waiver  as  to  a  particular  matter  for  a  particular  period  of  time.

     IN  WITNESS  WHEREOF, the Parties have executed this Agreement in duplicate
originals  by their proper officers as of the date and year first above written.

PROTEIN  DESIGN  LABS,  INC.          EXELIXIS,  INC.
By:  /s/  Laurence  Jay  Korn          By:  /s/  George  Scangos
     ------------------------               --------------------
     Laurence  Jay  Korn                    George  A.  Scangos
Chairperson  and  Chief                     Chief  Executive  Officer
Executive  Officer


[  *  ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION  PURSUANT  TO  RULE  24B-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.


LIST OF EXHIBITS Exhibit A - Research Plan Exhibit B - Product Profit Calculation Exhibit C - Form of Press Release Exhibit D-1 - EXEL Background Patents Exhibit D-2 - PDL Background Patents

D-2. A-1. EXHIBIT A RESEARCH PLAN [ * ]

A1 EXHIBIT A1 Entrypoints for Genetic Screens - Proposed or Initiated in Oncology Program [ * ]

EXHIBIT B PRODUCT PROFIT CALCULATION [ * ]

EXHIBIT C For Immediate Release ----------------------- Contacts: Robert L. Kirkman, M.D. Glen Y. Sato Vice President, Business Development Chief Financial Officer and Corporate Communications Exelixis, Inc. Protein Design Labs, Inc. (650) 837-7565 (510) 574-1419, rkirkman@pdl.com gsato@exelixis.com PROTEIN DESIGN LABS AND EXELIXIS ANNOUNCE ONCOLOGY ANTIBODY DRUG DISCOVERY COLLABORATION FREMONT and SOUTH SAN FRANCISCO, CA - May 22, 2001 - Protein Design Labs, Inc. (Nasdaq: PDLI) (PDL) and Exelixis, Inc. (Nasdaq: EXEL) (Exelixis) announced today a collaboration to discover and develop humanized antibodies for the diagnosis, prevention and treatment of cancer. The collaboration will utilize Exelixis' model organism genetics technology for the identification of new cancer drug targets, and PDL's antibody and clinical development expertise to create and develop new antibody drug candidates. PDL will provide Exelixis with $4.0 million in annual research funding for two or more years, and has purchased a $30.0 million note convertible after the first year of the collaboration into shares of Exelixis common stock. George A. Scangos, Ph.D., President and Chief Executive Officer of Exelixis, said, "We're pleased to be working with PDL, a leader in the development of humanized antibodies, and are already in a position to deliver our first targets under this collaboration. PDL is committed to a high-quality pipeline of anti-cancer antibody products, and I am pleased that PDL has recognized the value in our oncology target portfolio. The direct cash value to Exelixis is substantial, and there is considerably more value in the co-development rights that Exelixis has in this program, and in the resources that PDL will bring to the collaboration. This relationship is consistent with Exelixis' strategy of moving towards the market and capturing increasing value from the results of our research, and is a strong complement to our internal efforts directed towards finding small molecule therapeutics for cancer." Laurence Jay Korn, Ph.D., Chief Executive Officer and Chairperson of Protein Design Labs, said, "PDL has seven antibodies in clinical development, including Zamyl (anti-CD33) and Remitogen (anti-HLA-DR) for potential cancer indications, and Nuvion (anti-CD3) for the treatment of graft versus host disease. This collaboration provides PDL with an opportunity to expand our pipeline of oncology drugs with new antibodies that specifically block the initiation or progression of cancer, using the model organism genetic approach of Exelixis to identify novel targets. The Exelixis technology is designed to provide information about the function of a target at an early stage, which mav be quite valuable, as we believe antibodies for cancer are likely to work best when they interfere with a function necessary for cell growth or proliferation, or when they induce apoptosis." Under the terms of the collaborative agreement, PDL will receive an exclusive, worldwide license to develop antibodies against certain targets identified by Exelixis that are involved in cell growth, apoptosis (cell death) and proliferation. This approach may provide potential targets for developing novel humanized antibodies for the treatment of cancer using PDL's proprietary SMART antibody technology. Exelixis will have the right to co-fund and co-develop antibodies resulting from the collaboration. For antibody products developed by PDL that Exelixis elects not to co-develop, Exelixis will be entitled to specified milestone payments and royalty payments on any product sales. Protein Design Labs, Inc. is a leader in the development of humanized antibodies to prevent or treat various disease conditions. PDL currently has antibodies under development for autoimmune and inflammatory conditions, asthma and cancer. PDL holds fundamental patents in the U.S., Europe and Japan for its antibody humanization technology. Further information is available at www.pdl.com. Exelixis, Inc. is a leading life sciences biotechnology company focused on product development through its expertise in comparative genomics and model system genetics. These technologies provide a rapid, efficient and cost-effective way to move from DNA sequence data to knowledge about the function of genes and the proteins that they encode. Exelixis' technology is broadly applicable to all life science industries including pharmaceutical, diagnostic, agricultural biotechnology and animal health. Exelixis has partnerships with Aventis, Bayer, Pharmacia, Bristol-Myers Squibb and Dow AgroSciences and is building its internal development program in the area of oncology. For more information, please visit Exelixis' web site at www.exelixis.com. This press release contains certain forward-looking statements that involve risks and uncertainties that may affect our business, as more fully discussed in the "Risk Factors" section of our filings with the U.S. Securities and Exchange Commission. These risks and uncertainties include, but are not limited to, our ability successfully to collaborate and identify novel targets and develop potential products from the collaboration. Exelixis and PDL direct the reader to our respective SEC filings, including our respective Annual Reports on Form 10-K for the year ended December 31, 2000. The information in this press release is current as of its release date. Neither party assumes responsibility to update the information. Exelixis and the Exelixis logo are registered U.S. trademarks of Exelixis, Inc. Protein Design Labs, the PDL logo and SMART are registered U.S. trademarks and Zamyl, Remitogen and Nuvion are U.S. trademarks of Protein Design Labs, Inc.

EXHIBIT D-1 THIRD PARTY TECHNOLOGY [ * ]

EXHIBIT D-2 PDL EXCLUDED PATENTS [ * ] [ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO RULE 24B-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.