As filed with the Securities and Exchange Commission on August 27, 2001
                                                    Registration No. 333-_______
                                                    ============================
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM S-3
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
                           --------------------------

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



                                                               
            DELAWARE                             8731                    04-3257395
(State or other jurisdiction of       (Primary Standard Industrial    (I.R.S. Employer
 incorporation or organization)        Classification Code Number)   Identification No.)


                                 170 HARBOR WAY
                                  P.O. BOX 511
                          SOUTH SAN FRANCISCO, CA 94083
                                  (650) 837-7000
    (Address, including zip code, and telephone number, including area code, of
                    registrant's principal executive offices)
                              ____________________
                            GEORGE A. SCANGOS, PH.D.
                      PRESIDENT AND CHIEF EXECUTIVE OFFICER
                                 EXELIXIS, INC.
                                 170 HARBOR WAY
                                  P.O. BOX 511
                      SOUTH SAN FRANCISCO, CALIFORNIA 94083
                                 (650) 837-7000
  (Name, address, including zip code, and telephone number, including area code,
                              of agent for service)
                              ____________________
                                   Copies to:
                              ROBERT L. JONES, ESQ.
                              GIANNA M. BOSKO, ESQ.
                               COOLEY GODWARD LLP
                              FIVE PALO ALTO SQUARE
                               3000 EL CAMINO REAL
                            PALO ALTO, CA 94306-2155
                                 (650) 843-5000
                              ____________________
        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
   As soon as practicable after this registration statement becomes effective.
                              _____________________
     If  the  only  securities  being  registered on this Form are being offered
pursuant  to dividend or interest reinvestment plans, please check the following
box. [ ]
     If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [X]
     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [ ]
     If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ]
     If delivery of the Prospectus is expected to be made pursuant to Rule 434,
please check the following box. [ ]



                                            CALCULATION OF REGISTRATION FEE
=======================================================================================================================
                                                                                 PROPOSED MAXIMUM
TITLE OF CLASS OF SECURITIES      AMOUNT TO BE      PROPOSED MAXIMUM OFFERING    AGGREGATE OFFERING       AMOUNT OF
 TO BE REGISTERED                 REGISTERED(1)        PRICE PER SHARE (2)           PRICE (2)        REGISTRATION FEE
- ------------------------------  -----------------  ---------------------------  --------------------  -----------------
                                                                                          
- ------------------------------  -----------------  ---------------------------  --------------------  -----------------
Common Stock, $0.001 par value     600,600 shares  $                 9,387,378  $              15.63  $           2,347
=======================================================================================================================


(1)     Also includes additional shares of common stock that may be issued as a
        result of stock splits, stock dividends or similar transactions.
(2)     Estimated solely for the purpose of calculating the registration fee in
        accordance with Rule 457 under the Securities Act. The price per share
        and aggregate offering price are based on the average of the high and
        low prices of the registrant's common stock on August 22, 2001 as
        reported on the Nasdaq National  Market.
          THE  REGISTRANT  HEREBY AMENDS THIS REGISTRATION STATEMENT ON THE DATE
OR  DATES  AS  MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT
SHALL  FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT  SHALL  THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE  SECURITIES  ACT  OF  1933  OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE  ON  A  DATE THAT THE COMMISSION, ACTING PURSUANT TO SECTION 8(A), MAY
DETERMINE.

====== THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. THE SELLING STOCKHOLDERS MAY NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH THE SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER TO SELL THESE SECURITIES AND IS NOT SOLICITING AN OFFER TO BUY THESE SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED. SUBJECT TO COMPLETION, DATED AUGUST 27, 2001 600,600 SHARES EXELIXIS, INC. COMMON STOCK The selling stockholder listed on page 13 is offering up to 600,600 shares of Exelixis, Inc. common stock. We will not receive any proceeds from the sale of the shares by the selling stockholder. Our common stock trades on the Nasdaq National Market under the symbol EXEL. On August 24, 2001, the last reported sale price of our common stock was $17.09 per share. The selling stockholder may sell the shares described in this prospectus in a number of different ways and at varying prices. See "Plan of Distribution" on page 14 for more information about how it may sell its shares. We will not be paying any underwriting discounts or commissions in this offering. INVESTING IN OUR COMMON STOCK INVOLVES A HIGH DEGREE OF RISK. SEE "RISK FACTORS" BEGINNING ON PAGE 4. NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES COMMISSION HAS APPROVED OR DISAPPROVED THESE SECURITIES OR DETERMINED IF THIS PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE. __________ __, 2001.

TABLE OF CONTENTS PAGE ---- EXELIXIS 3 RISK FACTORS 4 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS 13 USE OF PROCEEDS 13 SELLING STOCKHOLDER 13 PLAN OF DISTRIBUTION 14 LEGAL MATTERS 16 EXPERTS 16 WHERE YOU CAN FIND MORE INFORMATION ABOUT EXELIXIS AND THIS OFFERING 16 This prospectus is part of a registration statement that we filed with the Securities and Exchange Commission. You should rely only on the information contained or incorporated by reference in this prospectus. We have not authorized anyone to provide you with information different from that contained in this prospectus. The selling stockholder is offering to sell, and seeking offers to buy, shares of our common stock only in jurisdictions where such offers and sales are permitted. The information contained in this prospectus is accurate only as of the date of this prospectus, regardless of the time of delivery of this prospectus or any sale of our common stock. Exelixis, Artemis Pharmaceuticals, ACTTAG, the Exelixis, Inc. logos and all other Exelixis product and service names are registered trademarks or trademarks of Exelixis, Inc. in the U.S. and in other selected countries. All other brand names or trademarks appearing in this prospectus are the property of their respective holders.

EXELIXIS 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 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 biology and drug discovery, built upon a foundation of 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 represent either potential product targets or drugs that may treat disease, or prevent disease initiation or progression. Specifically in cancer, the remarkable evolutionary conservation of the biochemical pathways between humans and "lower" organisms strongly supports the use of simple model systems, such as fruit flies, nematode worms, zebrafish and mice to identify key members of critical cancer pathways that can then be targeted for drug discovery. We expect to develop new cancer drugs by exploiting the underlying "genetic liabilities" of tumor cells to provide specificity in targeting these cells for destruction, while leaving normal cells unharmed. We have discovered and are further developing a number of small molecule drug targets in addition to monoclonal antibody drug targets. Molecules developed against these targets may selectively kill cancer cells while leaving normal cells unharmed, and may provide alternatives to current cancer therapies. While our proprietary programs focus on drug discovery and development, we believe that our proprietary technologies are valuable to all other industries whose products can be enhanced by an understanding of DNA or proteins, including the agrochemical, agricultural and diagnostic industries. Many of these industries have shorter product development cycles and lower risk than the pharmaceutical industry, while at the same time generating significant sales with double-digit product margins. By partnering with leading companies in multiple industries, we are able to diversify our business risk, while at the same time maximizing our future revenue stream. We are a Delaware corporation. Our principal executive offices are located at 170 Harbor Way, South San Francisco, California 94080, and our telephone number is (650) 837-7000. In this prospectus, "Exelixis," "we," "us" and "our" refer to Exelixis, Inc., unless the context otherwise requires.

RISK FACTORS You should carefully consider the following risk factors, in addition to other information included or incorporated by reference in this prospectus, before making an investment decision. The risks described below are not the only risks we face. Additional risks that we do not yet know of or that we currently think are immaterial may also impair our business operations. If any of the events or circumstances described in the following risks actually occurs, our business may suffer, the trading price of our common stock could decline and you may lose all or part of your investment. 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 agreements with Bristol-Myers Squibb expires in September 2002. The funded research term of the second collaborative 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, or 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, or 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; - exposure to fluctuations in foreign currency; - differences in foreign laws, business practices, statutes, regulations and tax provisions; 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.

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS Some of the statements in this prospectus and the documents incorporated by reference are forward-looking statements. These statements are based on our current expectations, assumptions, estimates and projections about our business and our industry, and involve known and unknown risks, uncertainties and other factors that may cause our or our industry's results, levels of activity, performance or achievement to be materially different from any future results, levels of activity, performance or achievements expressed or implied in or contemplated by the forward-looking statements. Words such as "believe," "anticipate," "expect," "intend," "plan," "will," "may," "should," "estimate," "predict," "potential," "continue" or the negative of such terms or other similar expressions, identify forward-looking statements. In addition, any statements that refer to expectations, projections or other characterizations of future events or circumstances are forward-looking statements. Our actual results could differ materially from those anticipated in such forward-looking statements as a result of several factors more fully described under the caption "Risk Factors" and in the documents incorporated by reference. The forward-looking statements made in this prospectus relate only to events as of the date on which the statements are made. USE OF PROCEEDS The proceeds from the sale of the common stock offered pursuant to this prospectus are solely for the account of the selling stockholder. We will not receive any proceeds from the sale of these shares of common stock. SELLING STOCKHOLDER We are registering the shares covered by this prospectus on behalf of the selling stockholder named in the table below. We issued all of the shares to the selling stockholder in a private placement transaction. We have registered the shares to permit the selling stockholder and its pledgees, donees, transferees or other successors-in-interest that receive their shares from the selling stockholder as a gift, partnership distribution or other non-sale related transfer after the date of this prospectus to resell the shares. The selling stockholder has agreed not to offer, sell, contract to sell, pledge, grant any option to purchase, make any short sale or otherwise dispose of the shares covered by this prospectus without our consent until July 17, 2002. The following table sets forth the name of the selling stockholder, the number of shares owned by it, the number of shares that may be offered under this prospectus, the number of shares of our common stock owned by the selling stockholder as of July 31, 2001, and the number of shares of our common stock owned by the selling stockholder after this offering is completed. On July 17, 2001, in connection with the issuance of the shares covered by this prospectus, the selling stockholder entered into a cancer research collaboration and license agreement with us, and thus is one of our corporate partners. The number of shares in the column "Number of Shares Being Offered" represents all of the shares that the selling stockholder may offer under this prospectus. The selling stockholder may sell some, all or none of the shares registered hereunder. Except for the lockup described above, we do not know how long the selling stockholder will hold the shares before selling them. The shares offered by this prospectus may be offered from time to time by the selling stockholder. Beneficial ownership is determined in accordance with Rule 13d-3(d) promulgated by the SEC under the Securities Exchange Act of 1934. Unless otherwise noted, none of the share amounts set forth below represent more than 1% of our outstanding stock as of July 31, 2001, adjusted as required by rules promulgated by the SEC. The percentages of shares owned prior to the offering are based on 49,161,649 shares of our common stock outstanding on July 31, 2001, giving effect to the sale of 600,600 shares to the selling stockholder in the private placement. SHARES BENEFICIALLY SHARES BENEFICIALLY OWNED PRIOR TO THE OWNED AFTER THE OFFERING NUMBER OF OFFERING (1) ----------------- SHARES BEING --------------- NAME NUMBER PERCENT OFFERED NUMBER PERCENT - ---------------------------- ------- -------- ------------ ------ ------- Bristol-Myers Squibb Company . . . . . 600,600 1.22% 600,600 0 * (1) Does not constitute a commitment to sell any or all of the stated number of shares of common stock. The number of shares offered shall be determined from time to time by the selling stockholder at its sole discretion. The number of shares to be owned by the selling stockholder after the offering, assuming the sale of all of the stated number of shares of common stock, will be less than one percent of its outstanding shares after the offering. PLAN OF DISTRIBUTION The selling stockholder may sell the shares from time to time. The selling stockholder will act independently of us in making decisions regarding the timing, manner and size of each sale. The sales may be made on one or more exchanges or in the over-the-counter market or otherwise, at prices and at terms then prevailing or at prices related to the then current market price, or in privately negotiated transactions. The selling stockholder may effect these transactions by selling the shares to or through broker-dealers. The selling stockholder may sell its shares in one or more of, or a combination of: - a block trade in which the broker-dealer will attempt to sell the shares as agent but may position and resell a portion of the block as principal to facilitate the transaction; - purchases by a broker-dealer as principal and resale by a broker-dealer for its account under this prospectus; - an exchange distribution in accordance with the rules of an exchange; - ordinary brokerage transactions and transactions in which the broker solicits purchasers; and - privately negotiated transactions. To the extent required, this prospectus may be amended or supplemented from time to time to describe a specific plan of distribution. If the plan of distribution involves an arrangement with a broker-dealer for the sale of shares through a block trade, special offering, exchange distribution or secondary distribution or a purchase by a broker or dealer, the amendment or supplement will disclose: - the name of the selling stockholder and of the participating broker-dealer(s); - the number of shares involved; - the price at which the shares were sold; - the commissions paid or discounts or concessions allowed to the broker-dealer(s), where applicable; - that a broker-dealer(s) did not conduct any investigation to verify the information set out or incorporated by reference in this prospectus; and - other facts material to the transaction. The selling stockholder has agreed not to offer, sell, contract to sell, pledge, grant any option to purchase, make any short sale or otherwise dispose of the shares covered by this prospectus without our consent until July 17, 2002. From time to time, the selling stockholder may transfer, pledge, donate or assign its shares of common stock to lenders or others and each of such persons will be deemed to be a "selling stockholder" for purposes of this prospectus. The number of shares of common stock beneficially owned by the selling stockholder will decrease as and when it takes such actions. The plan of distribution for the selling stockholder's shares of common stock sold under this prospectus will otherwise remain unchanged, except that the transferees, pledgees, donees or other successors will be selling stockholders hereunder. Upon being notified by a selling stockholder that a donee or pledgee intends to sell more than 500 shares, we will file a supplement to this prospectus. The selling stockholder may enter into hedging transactions with broker-dealers in connection with distributions of the shares or otherwise. In these transactions, broker-dealers may engage in short sales of the shares in the course of hedging the positions they assume with the selling stockholder. The selling stockholder also may sell shares short and redeliver the shares to close out short positions. The selling stockholder may enter into option or other transactions with broker-dealers that require the delivery to the broker-dealer of the shares. The broker-dealer may then resell or otherwise transfer the shares under this prospectus. The selling stockholder also may loan or pledge the shares to a broker-dealer. The broker-dealer may sell the loaned shares, or upon a default the broker-dealer may sell the pledged shares under this prospectus. In effecting sales, broker-dealers engaged by the selling stockholder may arrange for other broker-dealers to participate in the resales. Broker-dealers or agents may receive compensation in the form of commissions, discounts or concessions from the selling stockholder. Broker-dealers or agents may also receive compensation from the purchasers of the shares for whom they act as agents or to whom they sell as principals, or both. Compensation as to a particular broker-dealer might be in excess of customary commissions and will be in amounts to be negotiated in connection with the sale. A broker-dealer or agent and any other participating broker-dealer or the selling stockholder may be deemed to be an "underwriter" within the meaning of Section 2(11) of the Securities Act in connection with sales of the shares. Accordingly, any commission, discount or concession received by them and any profit on the resale of the shares purchased by them may be deemed to be underwriting discounts or commissions under the Securities Act. Because the selling stockholder may be deemed to be an "underwriter" within the meaning of Section 2(11) of the Securities Act, the selling stockholder will be subject to the prospectus delivery requirements of the Securities Act. In addition, any securities covered by this prospectus that qualify for sale under Rule 144 promulgated under the Securities Act may be sold under Rule 144 rather than under this prospectus. The selling stockholder has advised that it has not entered into any agreements, understandings or arrangements with any underwriters or broker-dealers regarding the sale of the shares. There is no underwriter or coordinating broker acting in connection with the proposed sale of shares by the selling stockholder. The shares will be sold only through registered or licensed brokers or dealers if required under applicable state securities laws. In addition, in some states the shares may not be sold unless they have been registered or qualified for sale in the applicable state or an exemption from the registration or qualification requirement is available and is complied with. Under applicable rules and regulations under the Exchange Act, any person engaged in the distribution of the shares may not simultaneously engage in market making activities with respect to our common stock for a period of two business days prior to the commencement of the distribution. In addition, the selling stockholder will be subject to applicable provisions of the Exchange Act and the associated rules and regulations under the Exchange Act, including Regulation M, which provisions may limit the timing of purchases and sales of shares of our common stock by the selling stockholder. We will make copies of this prospectus available to the selling stockholder and have informed the selling stockholder of the need to deliver copies of this prospectus to purchasers at or prior to the time of any sale of the shares. We will bear all costs, expenses and fees in connection with the registration of the shares. The selling stockholder will pay all commissions and discounts, if any, attributable to the sales of the shares. The selling stockholder may agree to indemnify any broker-dealer or agent that participates in transactions involving sales of the shares against specific liabilities, including liabilities arising under the Securities Act. We have agreed to indemnify the selling stockholder against specific liabilities in connection with the offering of the shares, including liabilities arising under the Securities Act. We have agreed to maintain the effectiveness of this registration statement until the earlier of such time as all the shares have been sold by the selling stockholder or such time as all of the shares may be sold pursuant to Rule 144(k) under the Securities Act. The selling stockholder may sell all, some or none of the shares offered by this prospectus.

LEGAL MATTERS The validity of the shares of common stock offered hereby will be passed upon by Cooley Godward LLP, Palo Alto, California. EXPERTS The consolidated financial statements incorporated in this prospectus by reference to the Annual Report on Form 10-K for the year ended December 31, 2000, have been so incorporated in reliance on the report of PricewaterhouseCoopers LLP, independent accountants, given on the authority of said firm as experts in auditing and accounting. WHERE YOU CAN FIND MORE INFORMATION ABOUT EXELIXIS You should rely only on the information provided or incorporated by reference in this prospectus. We have authorized no one to provide you with different information. We are not making an offer of these securities in any state where the offer is not permitted. You should not assume that the information in this prospectus or any prospectus supplement is accurate as of any date other than the date on the front of the document. We have filed with the SEC a resale registration statement on Form S-3 to register the common stock offered by this prospectus. However, this prospectus does not contain all of the information contained in the registration statement and the exhibits and schedules to the registration statement. We strongly encourage you to carefully read the registration statement and the exhibits and schedules to the registration statement. We file annual, quarterly and special reports, proxy statements and other information with the SEC. You may read and copy any document we file at the SEC's Public Reference Room at 450 Fifth Street, N.W., Washington, DC 20549 or at the SEC's other public reference rooms located in New York, New York and Chicago, Illinois. You can request copies of these documents by contacting the SEC and paying a fee for the copying cost. Please call the SEC at 1-800-SEC- 0330 for further information on the public reference rooms. Our SEC filings are also available to the public from the SEC's website at www.sec.gov. ----------- The SEC allows us to "incorporate by reference" the information contained in documents that we file with them, which means that we can disclose important information to you by referring to those documents. The information incorporated by reference is considered to be part of this prospectus. Information in this prospectus supersedes information incorporated by reference that we filed with the SEC prior to the date of this prospectus, while information that we file later with the SEC will automatically update and supersede this information. We incorporate by reference the documents listed below and any future filings we will make with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934. The following documents filed with the SEC are incorporated by reference in this prospectus: 1. Our Annual Report on Form 10-K for the year ended December 31, 2000; 2. Our Quarterly Report on Form 10-Q for the quarter ended March 31, 2001; 3. Our Quarterly Report on Form 10-Q for the quarter ended June 30, 2001; 4. Our Current Reports on Form 8-K, filed on May 15, 2001 pursuant to Item 2 of such report, and filed on July 18, 2001 and July 26, 2001 pursuant to Item 5 of such report; and 5. The description of our common stock set forth in our registration statement on Form 8-A, filed with the SEC on April 6, 2000. We will furnish without charge to you, on written or oral request, a copy of any or all of the documents incorporated by reference, including exhibits to these documents. You should direct any requests for documents to Exelixis, Inc., Attention: Investor Relations, 170 Harbor Way, P.O. Box 511, South San Francisco, California 94083, telephone: (650) 837-7000.

WE HAVE NOT AUTHORIZED ANY DEALER, SALESPERSON OR OTHER PERSON TO GIVE ANY INFORMATION OR REPRESENT ANYTHING NOT CONTAINED IN THIS PROSPECTUS. YOU SHOULD RELY ONLY ON THE INFORMATION PROVIDED OR INCORPORATED BY REFERENCE IN THIS PROSPECTUS. YOU SHOULD NOT RELY ON ANY UNAUTHORIZED INFORMATION. THIS PROSPECTUS DOES NOT OFFER TO SELL OR BUY ANY SHARES IN ANY JURISDICTION IN WHICH IT IS UNLAWFUL. THE INFORMATION IN THIS PROSPECTUS IS CURRENT AS OF THE DATE ON THE COVER. 600,600 SHARES EXELIXIS, INC. COMMON STOCK _________________________________ --------------------------------- PROSPECTUS _________________________________ ________ ___, 2001

PART II INFORMATION NOT REQUIRED IN THE PROSPECTUS ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION All of the amounts shown are estimates except the SEC registration fee. SEC registration fee $ 2,347 Legal fees and expenses 75,000 Accounting fees and expenses 10,000 Miscellaneous expenses 27,653 ________ Total $115,000 ======= ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS Under Section 145 of the Delaware General Corporation Law, Exelixis has broad powers to indemnify its directors and officers against liabilities they may incur in such capacities, including liabilities under the Securities Act. Exelixis' bylaws also provide that Exelixis will indemnify its directors and executive officers and may indemnify its other officers, employees and other agents to the fullest extent permitted by Delaware law. As permitted by Delaware law, Exelixis' amended and restated certificate of incorporation provides that no director of Exelixis will be personally liable to Exelixis or its stockholders for monetary damages for breach of fiduciary duty as a director, except for liability: - for any breach of duty of loyalty to Exelixis or to its stockholders; - for acts or omissions not in good faith or that involve intentional misconduct or a knowing violation of law; - for unlawful payment of dividends or unlawful stock repurchases or redemptions under Section 174 of the Delaware General Corporation Law; or - for any transaction from which the director derived an improper personal benefit. Exelixis' amended and restated certificate of incorporation further provides that Exelixis must indemnify its directors and executive officers and may indemnify its other officers, employees and agents to the fullest extent permitted by Delaware law. Exelixis believes that indemnification under its amended and restated certificate of incorporation covers negligence and gross negligence on the part of indemnified parties. Exelixis has entered into indemnification agreements with each of its directors and certain officers. These agreements, among other things, require Exelixis to indemnify each director and officer for certain expenses including attorneys' fees, judgments, fines and settlement amounts incurred by any such person in any action or proceeding, including any action by or in the right of Exelixis, arising out of the person's services as a director or officer to Exelixis, any subsidiary of Exelixis or to any other company or enterprise for which the person provides services at Exelixis' request. At present, there is no pending litigation or proceeding involving a director or officer of Exelixis as to which indemnification is being sought nor is Exelixis aware of any threatened litigation that may result in claims for indemnification by any officer or director.

ITEM 16. EXHIBITS. EXHIBIT NUMBER DESCRIPTION - ------- ----------- 4.1 Amended and Restated Certificate of Incorporation (1) 4.2 Restated Bylaws (1) 4.3 Specimen Stock Certificate (1) 5.1 Opinion of Cooley Godward LLP 10.29 Form of Stock Purchase Agreement, dated as of July 17, 2001, by and between Exelixis, Inc. and Bristol-Myers Squibb Company 23.1 Consent of Independent Accountants 23.2 Consent of Cooley Godward LLP (included in Exhibit 5.1) 24.1 Power of Attorney (included on signature page) ___________________ (1) Incorporated by reference to Exelixis' Registration Statement on Form S-1, as amended (File No. 333-96335), originally filed with the SEC on February 7, 2000. ITEM 17. UNDERTAKINGS. The undersigned registrant hereby undertakes: (1) To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement to include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement. (2) That, for the purpose of determining any liability under the Securities Act, each post-effective amendment shall be deemed to be a new registration statement relating to the securities it offers, and the offering of the securities at that time shall be deemed to be the initial bona fide offering thereof. (3) To remove from registration by means of a post-effective amendment any of the securities being registered that remain unsold at the termination of this offering. (4) That, for purposes of determining any liability under the Securities Act, each filing of the registrant's annual report pursuant to Section 13(a) or Section 15(d) of the Exchange Act that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of the securities at that time shall be deemed to be the initial bona fide offering thereof. Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers and controlling persons of the registrant pursuant to the foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the SEC this form of indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable. In the event that a claim for indemnification against these liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by a director, officer or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act and will be governed by the final adjudication of this issue.

SIGNATURES Pursuant to the requirements of the Securities Act of 1933, Exelixis, Inc. certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the city of South San Francisco, State of California, on August 27, 2001. EXELIXIS, INC. By: /s/ George A. Scangos -------------------------------------- George A. Scangos, Ph.D. President and Chief Executive Officer POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints GEORGE A. SCANGOS and GLEN Y. SATO and each or any one of them, his true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign any and all amendments (including post-effective amendments and registration statements filed pursuant to Rule 462) to this Registration Statement, and to file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in connection therewith, as fully to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or any of them, or their or his substitutes or substitute, may lawfully do or cause to be done by virtue hereof. Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities and on the dates indicated. SIGNATURE TITLE DATE /s/ George A. Scangos President, Chief Executive Officer August 27, 2001 - -------------------------- and Director George A. Scangos,Ph.D. (Principal Executive Officer) /s/ Glen Y. Sato Chief Financial Officer August 27, 2001 - -------------------------- (Principal Financial and Accounting Glen Y. Sato Officer) /s/Stelios Papadopoulos Chairman of the Board of Directors August 27, 2001 - -------------------------- Stelios Papadopoulos, Ph.D. - -------------------------- Director Charles Cohen, Ph.D. - -------------------------- Director Jurgen Drews, M.D. /s/ Geoffrey Duyk Director August 27, 2001 - -------------------------- Geoffrey Duyk, M.D., Ph.D. /s/ Jason S. Fisherman Director August 27, 2001 - -------------------------- Jason S. Fisherman, M.D. /s/ Jean-Francois Formela Director August 27, 2001 - -------------------------- Jean-Francois Formela, M.D. /s/ Vincent T. Marchesi Director August 27, 2001 - -------------------------- Vincent T. Marchesi, M.D., Ph.D. /s/ Peter Stadler Director August 27, 2001 - -------------------------- Peter Stadler, Ph.D. - -------------------------- Director Lance Willsey, M.D.

INDEX TO EXHIBITS EXHIBIT NUMBER ------- EXHIBIT NUMBER DESCRIPTION - ------- ----------- 4.1 Amended and Restated Certificate of Incorporation (1) 4.2 Restated Bylaws (1) 4.3 Specimen Stock Certificate (1) 5.1 Opinion of Cooley Godward LLP 10.29 Form of Stock Purchase Agreement, dated as of July 17, 2001, by and between Exelixis, Inc. and Bristol-Myers Squibb Company 23.1 Consent of Independent Accountants 23.2 Consent of Cooley Godward LLP (included in Exhibit 5.1) 24.1 Power of Attorney (included on signature page) ___________________ (1) Incorporated by reference to Exelixis' Registration Statement on Form S-1, as amended (File No. 333-96335), originally filed with the SEC on February 7, 2000.

                                                                     EXHIBIT 5.1



August  27,  2001

Exelixis,  Inc.
170  Harbor  Way
P.O.  Box  511
South  San  Francisco,  CA  94083

Ladies  and  Gentlemen:

You  have  requested  our  opinion with respect to certain matters in connection
with the filing by Exelixis, Inc. (the "Company") of a Registration Statement on
Form  S-3  (the  "Registration  Statement")  with  the  Securities  and Exchange
Commission  covering  the offering for resale of 600,600 shares of the Company's
common  stock,  $.001  par  value  (the "Shares"), issued in connection with the
Stock  Purchase Agreement, dated as of July 17, 2001, by and between the Company
and  Bristol-Myers  Squibb  Company.

In  connection  with  this  opinion,  we  have  examined  and  relied  upon the
Registration Statement and related Prospectus included therein, your Amended and
Restated  Certificate  of  Incorporation  and  Bylaws  and such other documents,
records, certificates, memoranda and other instruments as we deem necessary as a
basis  for this opinion. We have assumed the genuineness and authenticity of all
documents  submitted  to  us  as  originals,  the conformity to originals of all
documents  submitted  to us as copies thereof and the due execution and delivery
of  all  documents  where  due  execution and delivery are a prerequisite to the
effectiveness  thereof.

On  the  basis  of the foregoing, and in reliance thereon, we are of the opinion
that  the Shares have been validly issued, and are fully paid and nonassessable.
We  consent  to  the  filing  of  this opinion as an exhibit to the Registration
Statement  and to the reference to our firm under the caption "Legal Matters" in
the  Prospectus  included  in  the  Registration  Statement.

Very  truly  yours,

Cooley  Godward  LLP

By:     /s/  Robert  L.  Jones
        ----------------------
          Robert  L.  Jones


                                                                  EXHIBIT 10.29


                            STOCK PURCHASE AGREEMENT

     THIS STOCK PURCHASE AGREEMENT (the "Agreement") is made and entered into as
of  July  17,  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  (including,  its
subsidiaries,  the  "Company"),  and  BRISTOL-MYERS  SQUIBB  COMPANY, a Delaware
corporation  having  its  principal  place of business at Route 206 and Province
Line  Road,  Princeton,  NJ  08543 ("Purchaser").  The Company and Purchaser are
sometimes  referred  to herein individually as a "Party" and collectively as the
"Parties."

                                    RECITALS

     WHEREAS,  the  Company  and  Purchaser  have entered into an arrangement to
collaborate  in  certain  business and technology matters pursuant to which they
are  parties  to  a Cancer Collaboration Agreement and a License Agreement, each
dated  of  even  date  herewith  (such  Cancer  Collaboration Agreement and such
License Agreement, together with all ancillary documents thereto and hereto, are
hereinafter  collectively referred to as the "Transaction Documents") and desire
to further this relationship through the purchase of an equity investment in the
Company  by  Purchaser;  and

     WHEREAS,  Purchaser  and the Company have each determined that it is in the
best  interests  of their respective stockholders for Purchaser to purchase from
the  Company  newly issued shares of common stock, par value $.001 per share, of
the  Company (the "Common Stock"), at a 100% premium to market with an aggregate
purchase  price  of  approximately Twenty Million Dollars ($20,000,000) upon the
Closing  (as  defined  in  Section  2.1(a)).

                                    AGREEMENT

     NOW  THEREFORE,  the  parties  agree  as  follows:

1.     AUTHORIZATION  AND  SALE  OF  SHARES
       ------------------------------------

     1.1  AUTHORIZATION. The Company has authorized the issuance and sale of the
Shares  pursuant  to  the  terms  and  conditions  hereof.

     1.2  ISSUANCE  AND SALE. Subject to the terms and conditions hereof, on the
Closing  Date,  the Company will issue and sell to Purchaser, and Purchaser will
purchase  from the Company the number of shares of Common Stock (rounded down to
the nearest whole number) (the "Shares") equal to the number derived by dividing
(a)  Twenty  Million  Dollars ($20,000,000) by (b) (i) the average closing price
for  the  Common Stock for the fifteen (15) trading day period commencing on the
twentieth (20th) trading day prior to and including the Closing Date (as defined
in  Section  2.1(a)),  as  reported  on  the  Nasdaq  Stock  Market (the "ACP"),
multiplied  by  (ii)  two  (such  purchase  being hereinafter referred to as the
"Purchase").  The  purchase  price per Share shall be the ACP multiplied by two.

                                 $20,000,000
     Thus,          Shares  =  ----------------
                                 (ACP  *  2)

For  example,  if the ACP during the applicable period was $17.00, the number of
shares  purchased  pursuant  to  this  Agreement  would  be:

                                 $20,000,000
            Sample  shares  =  ---------------
                                 ($17  *  2)

or,  588,235.29,  which  rounds  down to 588,235 Shares at an aggregate purchase
price  of  $19,999,990.00  (i.e.,  588,235  x  $34).

2.     CLOSINGS;  DELIVERY
       -------------------

     2.1  CLOSING.

          (A)  CLOSING  DATE. The closing of the purchase and sale of the Shares
(the  "Closing")  shall  be  held at 10:00 a.m. California time on the Effective
Date  (the  "Closing  Date"),  or  at such other time or date as the Company and
Purchaser  may  agree  in  writing.

          (B)  LOCATION.  The  Closing  shall be held at the Company's principal
offices,  170 Harbor Way, South San Francisco, California or at such other place
as  the  Company  and  Purchaser  may  agree  in  writing.

     2.2 DELIVERY. Subject to the terms and conditions of this Agreement, at the
Closing  the Company will deliver to Purchaser a copy of correspondence from the
Company  to  the  Company's stock transfer agent dated no later than the Closing
Date,  which directs the Company's transfer agent to prepare and deliver a stock
certificate  representing  the  Shares  as soon as possible, and shall take such
further actions as are necessary to cause the stock certificate representing the
Shares  to  be  delivered  to  Purchaser  as  soon  as practicable following the
Closing.  The  purchase price as determined pursuant to Section 1.2 hereof shall
be  paid  by  wire  transfer  in  immediately  available  funds to the following
account:
         Silicon  Valley  Bank,  Santa  Clara,  CA
         ABA  Routing:  121-140-399
         Acct  Number:  33001-60643
         FBO:  Exelixis,  Inc.

3.     REPRESENTATIONS  AND  WARRANTIES  OF  THE  COMPANY
       --------------------------------------------------
     The  Company  hereby  represents  and  warrants  to  Purchaser  as follows:

     3.1  CORPORATE  ORGANIZATION  AND  AUTHORITY.  The  Company:

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

          (B)  has  the  corporate power and authority to own, lease and operate
its  properties and to carry on its business as now conducted and as proposed to
be  conducted;  and

          (C)  is qualified as a foreign corporation and in good standing in the
State  of  California and in all other jurisdictions in which such qualification
is  required;  provided,  however,  that  the Company need not be qualified in a
jurisdiction  in  which its failure to qualify would not have a Material Adverse
Effect.  When  used  in  connection with the Company, the term "Material Adverse
Effect"  means  any  change  or  event  that  is  or  is reasonably likely to be
materially  adverse  to  the  financial  condition or operations of the Company.

     3.2  AUTHORIZATION.  All  necessary  corporate  action  on  the part of the
Company  for  the  execution,  delivery and performance of all obligations under
this Agreement, for the consummation of the transactions contemplated hereby and
for  the  issuance and delivery of the Shares has been taken, and this Agreement
constitutes a valid and legally binding obligation of the Company enforceable in
accordance  with  its  terms.

     3.3  VALIDITY  OF  SHARES.  The  Shares, when issued, sold and delivered in
accordance with the terms and for the consideration set forth in this Agreement,
shall be duly and validly issued and outstanding, fully paid, nonassessable, and
free  and  clear of all pledges, liens, encumbrances and restrictions other than
the  restrictions  on  transfer  set  forth  in  Section  4.3.

     3.4  NO  CONFLICTS;  REQUIRED  FILINGS.

          (A) The business and operations of the Company have been and are being
conducted  in  accordance with all applicable laws, rules and regulations of all
governmental  authorities,  except for such violations of applicable laws, rules
and  regulations  which  would  not,  individually  or  in the aggregate, have a
Material  Adverse  Effect. The Company is not in violation of its Certificate of
Incorporation  or  Bylaws  nor  in  violation of, or in default under, any lien,
indenture,  mortgage,  lease,  agreement, instrument, commitment or arrangement,
except for such defaults which would not, individually or in the aggregate, have
a  Material  Adverse  Effect, or subject to any restriction which would prohibit
the  Company  from  entering  into  or  performing  its  obligations  under this
Agreement.

          (B)  The  execution, delivery and performance of this Agreement by the
Company  will not result in any violation of, be in conflict with, or constitute
a  default  under,  with  or without the passage of time (assuming no changes in
currently  existing  laws)  or  the giving of notice of (i) any provision of the
Company's Certificate of Incorporation or Bylaws as effective on the date hereof
and  on the Closing Date; (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)  to  the  Company's  knowledge,  any  statute,  rule or
governmental  regulation  applicable  to  the  Company.

          (C)  The  execution, delivery and performance of this Agreement by the
Company  does  not  and will not require any consent, approval, authorization or
permit  of,  or  filing  with  or  without  notification to, any governmental or
regulatory  authority,  United  States  or  foreign,  except  (i) for applicable
requirements,  if  any,  of the Securities and Exchange Act of 1934, as amended,
including the rules and regulations promulgated thereunder (the "Exchange Act"),
or  securities  laws  of  the various states of the United States (the "Blue Sky
Laws"),  and  (ii)  where  failure  to  obtain  such  consents,  approvals,
authorizations  or  permits, or to make such filings or notifications, would not
prevent  or  delay  consummation  of  the  transactions  contemplated under this
Agreement,  or  otherwise  prevent  the  Company from performing its obligations
under  this  Agreement,  and  would not individually or in the aggregate, have a
Material  Adverse  Effect.

     3.5  SEC  FILINGS;  FINANCIAL  STATEMENTS.

          (A) The Company has filed all forms, reports and documents required to
be  filed  by  it  with the Securities and Exchange Commission (the "SEC") since
April 11, 2000 and has heretofore made available to Purchaser, in the form filed
with  the  SEC,  its  (i) Annual Report on Form 10-K, as amended, for the period
ended December 31, 2000, (ii) Quarterly Report on Form 10-Q for the period ended
March  31,  2001,  (iii)  proxy statement for the annual meeting of stockholders
held  on  May  22,  2001,  (vi) Registration Statement on Form S-3 filed June 1,
2001,  and  (vii) Current Reports on Form 8-K filed on May 15, 2001. The Company
has  filed  additional reports with the SEC that may be accessed at www.sec.gov.
The forms, reports and other documents referred to in this subsection 3.5(a) are
referred to collectively as the "SEC Reports." The SEC Reports (A) were prepared
in  accordance with the requirements of the Exchange Act, and (B) did not at the
time  they were filed contain any untrue statement of a material fact or omit to
state  a  material  fact  required to be stated therein or necessary in order to
make the statements therein, in light of the circumstances under which they were
made,  not  misleading.  Furthermore,  the SEC Reports, when read as a whole, as
updated  by  the  Company's  press  releases  and  as of the date hereof, do not
contain  any  untrue  statements  of  a material fact and do not omit to state a
material  fact  necessary  to  make  the statements therein, not misleading. The
Company  is eligible to register the offer and resale of the Shares by Purchaser
on  a  Registration  Statement  on  Form  S-3  or  a  successor  form.


          (B)  Each  of  the  financial statements (including, in each case, any
notes  thereto)  contained  in  the  SEC  Reports  (collectively, the "Financial
Statements")  was prepared (i) in the case of Quarterly Reports on Form 10-Q, in
accordance  with  United  States  generally  accepted  accounting  principles as
promulgated  under  Regulation S-X by the SEC, with such principles applied on a
consistent  basis  throughout the periods indicated, and (ii) in the case of the
Annual  Report on Form 10-K, in accordance with United States generally accepted
accounting  principles  applied  on  a  consistent  basis throughout the periods
indicated  and comply in all material respects with the rules and regulations of
the  SEC,  including without limitation Regulation S-X. The Financial Statements
comply  in  all  material  respects with applicable accounting requirements, and
each  fairly presented the financial position, results of operations and changes
in  the financial position of the Company as of the respective dates thereof and
for  the  respective  periods  indicated  therein.

     3.6  PRIVATE  OFFERING. Neither the Company nor anyone acting on its behalf
has offered any of the Shares or any similar securities for issuance or sale to,
or solicited any offer to acquire any of the same from, anyone so as to make the
issuance  and  sale  of  the  Shares subject to the registration requirements of
Section  5  of  the  Securities Act of 1933, as amended, including the rules and
regulations  promulgated  thereunder  (the  "Securities  Act").

     3.7     CHANGES.  Except  as  set forth in the SEC Reports and as described
in  the  Schedule  of  Exceptions  attached  hereto, the Company has not, to the
extent  material  to  the  Company  (i)  incurred  any  debts,  obligations  or
liabilities,  absolute,  accrued  or  contingent,  whether due or to become due,
other than in the ordinary course of business other than the convertible loan in
principal  amount  of $30 million issued to Protein Design Labs, Inc. on May 22,
2001, (ii) mortgaged, pledged or subjected to lien, charge, security interest or
other encumbrance any of its assets, tangible or intangible, other than pursuant
to  certain equipment financing arrangements disclosed in its SEC Reports, (iii)
waived  any  debt  owed  to  the Company, (iv) satisfied or discharged any lien,
claim or encumbrance or paid any obligation other than in the ordinary course of
business,  (v)  declared,  set aside or paid any dividends or other distribution
with  respect  to  the  capital  stock of the Company, (vi) changed any material
contract  or  arrangement  by  which  the Company or any of its assets is bound,
(vii)  sold, assigned or transferred any of its patents, trademarks, copyrights,
trade secrets or other intangible assets, or (viii) entered into any transaction
other  than  in  the usual and ordinary course of business. Other than as may be
set  forth  in the SEC Reports, there has been no material adverse change in the
financial  condition or business, assets or properties, liabilities or operating
results  of  the Company since the date of the financial statements contained in
the  SEC Reports other than normal recurring operating losses, and there has not
occurred  any  loss,  destruction  or damage affecting the business, properties,
prospects  or  financial condition of the Company, whether or not insured, which
has  or  may  have  a Material Adverse Effect.  For purposes of this Section 3.7
only,  the  term "material" shall mean a single transaction or event, or a group
of  related transactions or events, involving debts, obligations, liabilities or
assets  with a cost or value in excess of $1 million, or cumulative transactions
and  events  involving  debts,  obligations,  liabilities  and  assets  with  a
cumulative  total  value  or cost in excess of $5 million, with respect to those
items  covered  by  this  Section  3.7.

     3.8  LITIGATION.  Other  than as described in the SEC Reports, there are no
legal  actions,  suits,  arbitrations  or  other  legal,  administrative  or
governmental  proceedings  pending  or,  to  the Company's knowledge, threatened
against  the  Company  or  its  properties,  assets or business, and neither the
Company  nor  any of its officers is aware of any facts which might result in or
form  the  basis  for  any  such  action, suit or other proceeding, in each case
which,  if adversely determined, would, individually or in the aggregate, affect
the  execution  and delivery of this Agreement or the performance by the Company
of  its obligations hereunder, or have a Material Adverse Effect. The Company is
not in default with respect to any judgment, order or decree of any court or any
governmental  agency  or  instrumentality,  which  default would have a Material
Adverse  Effect.

     3.9     CAPITAL  STOCK.  At  May  31, 2001, the authorized capital stock of
the Company consisted of 100,000,000 shares of Common Stock, of which 48,533,903
shares  were  outstanding,  and  10,000,000 shares of preferred stock, $.001 par
value  per  share,  of  which  no  shares were outstanding.  As of May 31, 2001,
8,007,229  shares of Common Stock were reserved for issuance under the Company's
stock  option  and  purchase plans, 621,068 shares were reserved for issuance in
connection with the Agritope 1997 Stock Award Plan and up to 929,478 shares were
reserved  for  issuance  in  connection  with  the Share Exchange and Assignment
Agreement  by  and among the Company and the stock and option holders of Artemis
Pharmaceuticals  GmbH.  Except  as  set  forth  in  the  SEC  Reports (including
outstanding  offer  letters  or  commitments to issue Common Stock options under
existing  employee  benefits  plans), there are no options, warrants, conversion
privileges,  preemptive  rights, or other rights or agreements issued or binding
on  the  Company  for  the  purchase or acquisition of any shares of its capital
stock  other  than  an  aggregate of 496,220 shares of Common Stock reserved for
issuance  pursuant  to outstanding warrants.  Except for shares of capital stock
issued pursuant to employee benefit plans, (a) no shares of capital stock of the
Company  have been issued following May 31, 2001, and (b) all of the outstanding
shares  of  the  Company's  capital  stock  are  validly  issued, fully paid and
nonassessable  and  were  issued  in  compliance with all applicable federal and
state  securities  laws. Except as set forth in the SEC Reports, the Company has
not  agreed  to  register the sale of any of its securities under the Securities
Act,  and  there  are  no  outstanding  subscriptions, options, warrants, calls,
contracts,  demands,  commitments,  conversion  rights  or  other  agreements or
arrangements  of  any character or nature whatever under which the Company is or
may  be  obligated  to  issue  its  Common Stock, preferred stock or warrants or
options to purchase Common Stock or preferred stock.  Except as set forth in the
SEC  Reports, no holder of any security of the Company is entitled to any rights
of first refusal, preemptive or similar rights to purchase any securities of the
Company  (including,  without  limitation,  the  Shares).

4.     REPRESENTATIONS  AND WARRANTIES OF PURCHASER; RESTRICTIONS ON TRANSFER OF
       -------------------------------------------------------------------------
       THE  SHARES
       -----------

     4.1     REPRESENTATIONS  AND  WARRANTIES.  Purchaser  hereby represents and
warrants  to  the  Company  as  follows:

          (A)  CORPORATE  ORGANIZATION AND AUTHORITY. Purchaser 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.

          (B)  AUTHORIZATION. Purchaser has taken all necessary corporate action
necessary  for  the execution, delivery and performance of all obligations under
this  Agreement and the consummation of the transactions contemplated hereby and
upon  execution  and  delivery,  this  Agreement constitutes a valid and legally
binding  obligation  of  Purchaser  enforceable  in  accordance  with its terms.

          (C) INVESTMENT ONLY. This Agreement is made with Purchaser in reliance
upon  its representations to the Company, which by Purchaser's execution of this
Agreement Purchaser hereby confirms, that the Shares to be received by Purchaser
will be acquired for investment for Purchaser'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  Purchaser  has no present intention of selling, granting any participation
in,  or  otherwise distributing the same. By executing this Agreement, Purchaser
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  Shares.

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

          (E)  ACCREDITED  PURCHASER. Purchaser 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.

     4.2  NO REGISTRATION. Purchaser understands that the offering of the Shares
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  Purchaser's  representations  set  forth  in  this  Agreement.

     4.3  LIMITATIONS  ON  TRANSFERABILITY. Purchaser covenants that in no event
will  it  dispose  of  any  of  the  Shares  (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 (a) Purchaser shall have notified the Company
of  the  proposed  disposition,  and  (b) if requested by the Company, Purchaser
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 (i) such disposition will not
require  registration  under  the  Securities  Act  and  (ii) appropriate action
necessary  for  compliance  with  the  Securities  Act and any applicable state,
local,  or  foreign  law  has  been  taken.

     4.4 LEGEND. Each certificate representing the Shares shall be endorsed with
substantially  the  following  legends:

     THE SECURITIES EVIDENCED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER
     THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD, TRANSFERRED OR
     ASSIGNED UNLESS THERE IS AN EFFECTIVE REGISTRATION STATEMENT UNDER SUCH ACT
     COVERING  SUCH SECURITIES, THE TRANSFER IS MADE IN COMPLIANCE WITH RULE 144
     PROMULGATED  UNDER  SUCH ACT, OR THE COMPANY RECEIVES AN OPINION OF COUNSEL
     REASONABLY  SATISFACTORY TO THE COMPANY STATING THAT SUCH SALE, TRANSFER OR
     ASSIGNMENT  IS  EXEMPT  FROM  THE REGISTRATION AND DELIVERY REQUIREMENTS OF
     SUCH  ACT.  THE  SECURITIES  EVIDENCED BY THIS CERTIFICATE ARE SUBJECT TO A
     LOCK-UP  AGREEMENT  AND  MAY  NOT BE SOLD, TRANSFERRED OR ASSIGNED PRIOR TO
     JULY  17, 2002 WITHOUT THE PRIOR WRITTEN CONSENT OF THE ISSUER. The Company
     need  not  register  a transfer of any Shares and may instruct its transfer
     agent  not  to  register  the transfer of the Shares, unless the conditions
     specified  in  the  foregoing  legends  are  satisfied.

5.     CONDITIONS  TO  CLOSING
       -----------------------

     5.1     CONDITIONS TO PURCHASE OBLIGATIONS OF PURCHASER.  The obligation of
Purchaser  to  consummate  the  Purchase  is  subject  to  the  satisfaction  or
Purchaser's  waiver,  on  or prior to the Closing Date, of each of the following
conditions:

          (A)  The Company shall have received an opinion of Cooley Godward LLP,
dated  the Closing Date, in substantially the form attached hereto as Exhibit A.

          (B)  The  Company  and  Purchaser  shall  have  obtained  all consents
(including  all governmental or regulatory consents, approvals or authorizations
required in connection with the valid execution and delivery of this Agreement),
permits  and  waivers  necessary  or  appropriate  for  consummation  of  the
transactions  contemplated  by  the  Purchase  under  this  Agreement.

          (C)  No  federal  or  state  governmental authority or other agency or
commission  or  court  of  competent  jurisdiction  shall  have enacted, issued,
promulgated,  enforced,  or  entered any law, rule, regulation, executive order,
decree,  injunction or other order which is then in effect and has the effect of
making  illegal  the  purchase  of,  or  payment for, the Shares by Purchaser or
otherwise  preventing  the  consummation of any of the transactions contemplated
under  this  Agreement.

          (D)  There  shall  be  no  temporary  restraining  order,  preliminary
injunction or permanent injunction or other order preventing the consummation of
the  Purchase issued by any court which remains in effect, no litigation seeking
the  issuance of such an order or injunction and no claims or actions threatened
or pending which have a reasonably likely prospect of resulting in such order or
injunction  preventing  the  consummation  of  the  Purchase.

          (E)  The  Company  and Purchaser shall have executed and delivered the
Transaction  Documents.

     5.2  CONDITIONS  TO PURCHASE OBLIGATIONS OF THE COMPANY. The obligations of
the  Company  to sell and issue the Shares is subject to the satisfaction or the
Company's  waiver,  on  or  prior  to the Closing Date, of each of the following
conditions:

          (A)  Purchaser's  representations  and  warranties  contained  in this
Agreement  are  true and correct as of the Closing Date as though made on and as
of  that  date.

          (B)  The  Company  and  Purchaser  shall  have  obtained  all consents
(including  all governmental or regulatory consents, approvals or authorizations
required in connection with the valid execution and delivery of this Agreement),
permits  and  waivers  necessary  or  appropriate  for  consummation  of  the
transactions  contemplated  by  the  Purchase  under  this  Agreement.

          (C)  No  state governmental authority or other agency or commission or
state  court  of competent jurisdiction shall have enacted, issued, promulgated,
enforced,  or  entered  any  law,  rule,  regulation,  executive  order, decree,
injunction  or  other order which is then in effect and has the effect of making
illegal  the  purchase  of, or payment for, the Shares by Purchaser or otherwise
preventing  the  consummation of any of the transactions contemplated under this
Agreement.

          (D)  The  Company  and Purchaser shall have executed and delivered the
Transaction  Documents.


6.     ADDITIONAL  AGREEMENTS;  LOCKUP
       -------------------------------
     6.1  REGISTRATION  REQUIREMENTS.

          (A)  REGISTRATION  OF  THE  SHARES.

               (I)     Using  its  diligent  best  efforts,  and  as  soon  as
reasonably  practicable  after  the  Closing  Date  (but  in no event later than
forty-five  (45)  days  after the Closing Date), the Company shall file with the
SEC  a Registration Statement on Form S-3 covering the Shares (the "Registration
Statement"), and shall secure the effectiveness of the Registration Statement as
soon  as  reasonably  practicable  thereafter.

               (II)     Subject  to  Section  6.1(c),  the  Company  shall  be
obligated  to maintain the effectiveness of the Registration Statement until the
earlier  of  (A)  the  sale  of  all of the Shares or (B) the time all otherwise
unsold  Shares  may  be  sold  pursuant  to  Rule  144(k).
               (III)     If  the  Company  is  unable  to cause the Registration
Statement  to  become  effective prior to the first anniversary of the Effective
Date,  the  Company  shall,  if  Purchaser so requests in writing not later than
ninety  (90)  days  after  the expiration of such one year period, purchase from
Purchaser  the  Shares  for a purchase price equal to the purchase price for the
Shares.  Such  purchase shall be effected not later than fifteen (15) days after
the  Company's  receipt  of  Purchaser's  request  therefor.

          (B)  REGISTRATION  EXPENSES.  The  Company  shall pay all Registration
Expenses  (as  defined below) in connection with any registration, qualification
or  compliance  hereunder,  and  Purchaser  shall  pay  all Selling Expenses (as
defined  below)  that  relate  to  the  Shares  of  Purchaser  to be registered.
"Registration  Expenses"  shall  mean all expenses, except for Selling Expenses,
incurred  by  the  Company  in complying with the registration provisions herein
described,  including,  without  limitation,  all  registration,  qualification,
compliance  and  filing  fees,  printing  expenses,  escrow  fees,  fees  and
disbursements  of  counsel  for  the  Company,  blue  sky fees and expenses, and
accounting  fees  (including  the  expense  of any special audits incident to or
required  by  any  such registration). "Selling Expenses" shall mean all fees of
counsel  for  the  Purchaser,  selling  commissions, underwriting fees and stock
transfer  taxes  applicable  to  the  Shares.

          (C)  REGISTRATION SUSPENSION. The Company shall, upon (A) the issuance
by  the  SEC  of  a  stop order suspending the effectiveness of the Registration
Statement  or  the  initiation  of  proceedings with respect to the Registration
Statement  under  Section 8(d) or 8(e) of the Securities Act, (B) the occurrence
of  any  event  or the existence of any fact (a "Material Event") as a result of
which  the  Registration  Statement  shall  contain  any  untrue  statement of a
material  fact  or omit to state any material fact required to be stated therein
or  necessary  to  make  the  statements  therein not misleading, or the related
prospectus  (the  "Prospectus") shall contain any untrue statement of a material
fact  or  omit  to  state  any  material  fact  required to be stated therein or
necessary  to  make  the  statements  therein, in the light of the circumstances
under  which  they were made, not misleading, or (C) the occurrence or existence
of  any  pending corporate development that, in the reasonable discretion of the
Company,  makes  it  appropriate to suspend the availability of the Registration
Statement  and  the  Prospectus,

               (I)  in  the  case  of  clause  (B)  above,  subject  to the next
sentence,  as promptly as practicable prepare and file, if necessary pursuant to
applicable  law,  a  post-effective amendment to the Registration Statement or a
supplement  to  the Prospectus or any document incorporated therein by reference
or file any other required document that would be incorporated by reference into
the  Registration  Statement  and  Prospectus so that the Registration Statement
does  not  contain  any untrue statement of a material fact or omit to state any
material  fact required to be stated therein or necessary to make the statements
therein  not  misleading,  and  such  prospectus  does  not  contain  any untrue
statement  of  a material fact or omit to state any material fact required to be
stated  therein or necessary to make the statements therein, in the light of the
circumstances  under  which  they  were  made,  not  misleading,  as  thereafter
delivered  to  the  purchasers  of the Shares being sold thereunder, and, in the
case of a post-effective amendment to the Registration Statement, subject to the
next  sentence,  use its reasonable efforts to cause it to be declared effective
as  promptly  as  is  practicable,  and

               (II)  give  notice  to  Purchaser  that  the  availability of the
Registration  Statement  is suspended (a "Deferral Notice") and, upon receipt of
any  Deferral  Notice,  Purchaser  agrees not to sell any Shares pursuant to the
Registration  Statement  until  such  Purchaser's  receipt  of  copies  of  the
supplemented or amended prospectus provided for in clause (i) above, or until it
is  advised  in  writing by the Company that the Prospectus may be used, and has
received  copies of any additional or supplemental filings that are incorporated
or deemed incorporated by reference in such Prospectus. The Company will use all
reasonable  efforts  to ensure that the use of the Prospectus may be resumed (x)
in  the case of clause (A) and (B) above, as promptly as is practicable, and (y)
in  the  case  of  clause  (C)  above,  as  soon as, in the sole judgment of the
Company, public disclosure of such Material Event would not be prejudicial to or
contrary  to the interests of the Company or, if necessary to avoid unreasonable
burden  or  expense,  as  soon  as  practicable thereafter. The Company shall be
entitled  to  exercise  its  right  under  this  Section  6.1(d)  to suspend the
availability  of the Registration Statement or any Prospectus no more than three
(3)  times  in  any  twelve-month  period,  and any such period during which the
availability  of the Registration Statement and any Prospectus is suspended (the
"Deferral  Period")  shall  not  exceed thirty (30) days. The period of any such
Deferral  Period  shall be added to the period of time the Company has agreed to
keep  the  Registration  Statement  effective.  The  Company  shall  use  all
commercially reasonable efforts to limit the duration and number of any Deferral
Periods.  Purchaser  hereby agrees that upon receipt of any Deferral Notice from
the  Company,  Purchaser shall, and shall cause each of its officers, directors,
employees,  affiliates,  advisors,  agents  and  representatives  to,  keep
confidential  all  nonpublic  information set forth in such notice including the
existence  or  terms  of  such  Deferral  Notice.

          (D)  REGISTRATION PROCEDURES. In the case of any registration effected
by  the  Company  pursuant  to  this  Section  6.1,  the  Company  will  use all
commercially  reasonable  efforts:

               (I)     to  respond  promptly to any comments of the SEC relating
to  the  Registration  Statement,  and  to  prepare  and  file with the SEC such
amendments  (including  post-effective  amendments)  and  supplements  to  the
Registration  Statement  and  the  prospectus  used  in  connection  with  the
Registration  Statement as may be necessary to comply with the provisions of the
Securities  Act with respect to the disposition of all securities covered by the
Registration  Statement;

               (II)     to  furnish  such  number of Registration Statements and
other  documents  incident  thereto, including any amendment of or supplement to
the Registration Statement or prospectus, as any holder of securities covered by
the  Registration Statement may reasonably request to facilitate the public sale
or  other  disposition  of  all  or  any  of  the  Shares;

               (III)  list  the  class  of Company stock in which the Shares are
included  on  the  Nasdaq  National  Market.

               (IV)     to  file  the  documents  required  of  the  Company and
otherwise use all commercially reasonable efforts to maintain requisite blue sky
clearance  in  (A)  all  U.S.  jurisdictions  in  which  any  of  the Shares are
originally  sold  and  (B)  all  other states specified in writing by Purchaser;
provided,  however, that, as to clause (B), the Company shall not be required to
- --------   --------
qualify  to  do business in any state in which it is not now so qualified or has
not  so  consented  except  as  may  be  required  by  the  Securities  Act; and

               (V)     to keep Purchaser advised in writing as to the filing and
completion  of  each  registration,  qualification  and  compliance.

               (VI)  to  advise  Purchaser  promptly  at  any  time  when  the
prospectus  (including  any  supplements  thereto) contained in the Registration
Statement  then in effect under this Section 6.1 includes an untrue statement of
material fact or omits to state a material fact required to be stated therein or
necessary  to  make  the  statements  therein  not  misleading  in  light of the
circumstances  then  existing.

          (E)  INDEMNIFICATION.

               (I)  INDEMNIFICATION  BY  THE  COMPANY.  The  Company  agrees  to
indemnify  and  hold harmless Purchaser (and its officers, directors, employees,
affiliates  and  agents),  from and against any and all losses, claims, damages,
liabilities  or expenses (or actions or proceedings in respect thereof) to which
any  of  them  may  become  subject (under the Securities Act or otherwise) with
respect  to any registration, qualification or compliance under this Section 6.1
insofar  as such losses, claims, damages, liabilities or expenses (or actions or
proceedings  in  respect thereof) arise out of, or are based upon (i) any untrue
statement  or alleged untrue statement of a material fact or omission or alleged
omission  to state a material fact required to be stated therein or necessary to
make  the  statements  therein, in light of the circumstances in which they were
made,  not  misleading,  in  any  registration  statement (on the effective date
thereof), prospectus, offering circular or other document (including any related
registration  statement,  notification  or  the  like)  incident  to  any  such
registration,  qualification or compliance, or (ii) any violation by the Company
of  any  applicable  rule or regulation under the Securities Act relating to any
action or inaction required of the Company in connection with such registration,
qualification  or compliance, or (iii) any failure by the Company to fulfill any
undertaking  included  in  the registration statement or related documents or to
fulfill  any  of  its obligations under Section 6.1 hereof. The Company will, as
incurred,  reimburse  the  indemnified  parties  herein  for  any legal or other
expenses  reasonably incurred in investigating, defending or preparing to defend
any  such  claims, actions or proceedings in respect thereof; provided, however,
                                                              --------  -------
that  the  Company  shall not be liable in any such case to the extent that such
loss,  claim,  damage,  liability or expense arises out of, or is based upon (A)
any  untrue  statement  or  omission  of  a  material fact required to be stated
therein  or  necessary  to  make  the  statements  therein,  in  light  of  the
circumstances  in  which  they  were  made,  not misleading, in any registration
statement  (on  the  effective  date  thereof), prospectus, offering circular or
other  document  (including  any related registration statement, notification or
the  like)  incident to any such registration, qualification or compliance, made
in  reliance  upon  and  in conformity with written information furnished to the
Company  by  Purchaser  specifically for use in preparation of such document, or
(B)  an  untrue statement or omission in any prospectus that is corrected in any
subsequent prospectus, or supplement or amendment thereto, that was delivered to
Purchaser  prior  to  the  sale  or  sales from which a loss or liability arose.

               (II)     INDEMNIFICATION  BY  PURCHASER.  Purchaser  agrees  to
indemnify and hold harmless the Company (and its officers, directors, employees,
affiliates  and  agents),  from  and  against  any  losses,  claims,  damages,
liabilities  or expenses (or actions or proceedings in respect thereof) to which
any  of  them  may  become  subject (under the Securities Act or otherwise) with
respect  to any registration, qualification or compliance under this Section 6.1
insofar  as such losses, claims, damages, liabilities or expenses (or actions or
proceedings  in  respect thereof) arise out of, or are based upon (A) any untrue
statement  or  omission  of  a  material  fact  required to be stated therein or
necessary to make the statements therein, in light of the circumstances in which
they  were made, not misleading, in any registration statement (on the effective
date  thereof),  prospectus,  offering circular or other document (including any
related  registration  statement, notification or the like) incident to any such
registration,  qualification  or  compliance,  made  in  reliance  upon  and  in
conformity  with written information furnished to the Company by or on behalf of
Purchaser  specifically  for  use  in  preparation  of  such document; provided,
                                                                       --------
however,  that Purchaser shall not be liable in any such case for any (i) untrue
- -------
statement  or  omission  in any registration statement, prospectus or other such
document  which  statement  has  been  corrected,  in  writing, by Purchaser and
delivered  to  the  Company  ten  (10) days before the sale from which such loss
occurred,  (B)  an  untrue  statement or omission in any prospectus delivered by
Purchaser  that  is  corrected  in  any  subsequent prospectus, or supplement or
amendment  thereto,  and  delivered to Purchaser prior to the sale or sales from
which  a loss or liability arose, or (C) any failure by Purchaser to fulfill any
of  its  obligations  under  Section  6.1  hereof.  Purchaser will, as incurred,
reimburse  the  indemnified  parties  herein  for  any  legal  or other expenses
reasonably  incurred in investigating, defending or preparing to defend any such
claims,  actions  or  proceedings  in  respect  thereof.

               (III)     INDEMNIFICATION  PROCEDURE.  Promptly  after receipt by
any  indemnified  party of a notice of a claim or the beginning of any action in
respect  of  which  indemnity  is  to  be  sought  against an indemnifying party
pursuant  to  this  Section  6.1,  such  indemnified  party  shall  notify  the
indemnifying  party  in  writing  of  such  claim or of the commencement of such
action,  and,  subject  to  the  provisions hereinafter stated, in case any such
action shall have been brought against an indemnified party and the indemnifying
party shall have been notified thereof, the indemnifying party shall be entitled
to  participate  therein,  and,  to the extent that it shall wish, to assume the
defense  of such action, with counsel reasonably satisfactory to the indemnified
party. After notice from the indemnifying party to such indemnified party of the
indemnifying  party's  election  to assume the defense thereof, the indemnifying
party  shall  not  be  liable  to  such indemnified party for any legal expenses
subsequently  incurred  by such indemnified party in connection with the defense
thereof;  provided,  however,  that if there exists or shall exist a conflict of
          --------   -------
interest  that  would  make  it  inappropriate in the reasonable judgment of the
indemnified  party  for the same counsel to represent both the indemnified party
and  such  indemnifying  party  or  any  affiliate  or  associate  thereof,  the
indemnified  party shall be entitled to retain its own counsel at the expense of
such  indemnifying  party.  Failure  of any indemnifying party to give notice as
provided  herein  shall  not  relieve  the indemnifying party of its obligations
under  this  Section  6.1(e).  No indemnifying party, in the defense of any such
claim  or  action,  except  with  the  consent  of each indemnified party, shall
consent  to  entry  of  any  judgment  or  enter  into  any  settlement.

               (IV)     OTHER  LIABILITY.  The  obligations  of  the Company and
Purchaser under this Section 6.1 shall be in addition to any liability which the
Company  and  Purchaser  may  otherwise  have.

     6.2  FILINGS.  The  Company  covenants  and  agrees to use all commercially
reasonable  efforts to: (i) make and keep public information available, as those
terms are understood and defined in Rule 144, until the date on which the Shares
may  be sold pursuant to Rule 144(k) (or any successor rule); and (ii) file with
the  Commission  in  a timely manner all reports and other documents required of
the  Company  under  the  Securities  Act  and  Exchange  Act.

     6.3  OTHER  ACTIONS.  Upon  the  terms  and  subject  to  the  conditions
hereof,  each  of  the  Parties  hereto  shall  in  good faith, use commercially
reasonable efforts to take, or cause to be taken, all appropriate action, and to
do,  or  cause  to  be  done,  all  things  necessary, proper or advisable under
applicable laws and regulations to consummate and make effective the transaction
contemplated  under  this  Agreement,  including,  without  limitation,  using
commercially  reasonable  efforts  to  obtain  all  licenses, permits, consents,
approvals, authorizations, qualifications and orders of governmental authorities
and  parties  to  contracts with the Company as are necessary for the execution,
delivery  and performance of this Agreement. The Company covenants and agrees to
use its best efforts to aid in the removal of all restrictive legends affixed to
stock  certificates  representing the Shares on an expedited basis in accordance
with  applicable  law,  including  without  limitation:  (i) upon the request of
Purchaser,  causing  the  Company's counsel to render (at the Company's cost) an
opinion of counsel required to be delivered by Purchaser pursuant to Section 4.3
of  this  Agreement;  and  (ii)  providing  such information as requested by the
Company's  registrar  or  transfer  company.

     6.4  LOCKUP.  Purchaser agrees that for a period of twelve months following
the  Closing  Date, Purchaser and its affiliated entities shall not offer, sell,
contract  to  sell, pledge, grant any option to purchase, make any short sale or
otherwise  dispose  of any Shares held by Purchaser or grant any option or other
rights  to any person to acquire any Shares without the prior written consent of
the  Company;  provided,  however,  this Section 6.4 will terminate and be of no
force  and  effect  (a)  in  the  event  the  Company  is  in default under this
Agreement,  or  (b) effective upon a Change in Control of the Company. A "Change
in  Control"  of  the  Company  shall  be  deemed to 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  (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.

7.     MISCELLANEOUS
       -------------

     7.1  ENTIRE  AGREEMENT;  AMENDMENT.  This  Agreement constitutes the entire
Agreement  between  the parties hereto with respect to the within subject matter
and  supersedes all previous Agreements, whether written or oral. This Agreement
shall  not  be  changed or modified orally, but only by an instrument in writing
signed  by  both  parties.

     7.2  GOVERNING  LAW;  CHOICE  OF  LAW.  This  Agreement  and  the validity,
performance,  construction and effect of this Agreement shall be governed in all
respects  by  the  laws  of  the  State  of  Delaware, with the exception of its
provisions  governing  the  conflict  of  laws.

     7.3  ASSIGNMENT. This Agreement may not be assigned by either Party without
the  prior written consent of the other, except that the Company may assign this
Agreement  to  a  party which acquires all or substantially all of the Company's
business,  whether  by  merger,  sale  of  assets  or  otherwise.  A  merger,
consolidation  or  other  reorganization  shall  be  deemed  to  constitute  an
assignment.

     7.4  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 mailed by
first  class  certified  or  registered  mail, postage prepaid, express delivery
service  or  personally  delivered.  Unless  otherwise specified in writing, the
mailing  addresses  of  the  Parties  shall  be  as  described  below.

          For  Exelixis:           Exelixis,  Inc.
                                   170  Harbor  Way
                                   P.O.  Box  511
                                   South  San  Francisco,  CA  94083
                                   Attention:  General Counsel

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

          For  BMS:                Bristol-Myers  Squibb  Company
                                   P.O.  Box  4000
                                   Route  206  and  Province  Line  Road
                                   Princeton,  NJ  08543-4000
                                   Attention: Vice President and Senior Counsel,
                                        Pharmaceutical  Research  Institute  and
                                        Worldwide  Business  Development
                                        Facsimile  No.  (609)  252-4232

          With  a  copy  to:       Reed  Smith  LLP
                                   Princeton  Forrestal  Village
                                   136  Main  Street  -  Suite  250
                                   Princeton,  NJ  08543-7839
                                   Attn:  Edward  P.  Bromley  III
                                   Facsimile  No.  (609)  951-0824

     7.5  WAIVER.  The failure of either Party to assert a right hereunder or to
insist  upon  compliance  with any term or condition of this Agreement shall not
constitute  a  waiver  of  that  right or excuse a similar subsequent failure to
perform  any  such  term  or  condition  by  the other Party. None of the terms,
covenants  and  conditions of this Agreement can be waived except by the written
consent  of  the  Party  waiving  compliance.

     7.6  FINDER'S  FEES.

          (A)  The  Company  (i) represents and warrants that it has retained no
investment  bankers,  finders  or  brokers  in  connection with the transactions
contemplated  by  this Agreement and (ii) hereby agrees to indemnify and to hold
Purchaser  harmless  of  and  from  any  costs,  expenses  or  liability for any
commission  or  compensation  in  the nature of a finder's fee to any investment
banker,  finder,  broker or other person or firm (including legal fees and other
costs and expense of defending against such liability or asserted liability) for
which  it,  or  any  of  its  employees  or  representatives,  are  responsible.

          (B)  Purchaser  (i)  represents  and  warrants that it has retained no
investment  bankers,  finders  or  brokers  in  connection with the transactions
contemplated  by this Agreement and (ii) hereby agrees to indemnify and hold the
Company harmless of and from any costs, expenses or liability for any commission
or  compensation  in  the  nature  of  a  finder's fee to any investment banker,
finder, broker or other person or firm (including legal fees and other costs and
expense of defending against such liability or asserted liability) for which it,
or  any  of  its  employees  or  representatives,  are  responsible.

     7.7  EXPENSES.  The  Company  and  Purchaser shall each bear its respective
expenses  and  legal  fees  incurred  with  respect  to  this  Agreement and the
transaction  contemplated  hereby.

     7.8  HEADINGS.  The  captions  used  herein are inserted for convenience of
reference  only  and  shall not be construed to create obligations, benefits, or
limitations.

     7.9  COUNTERPARTS.  This  Agreement may be executed in counterparts, all of
which taken together shall be regarded as one and the same instrument. Execution
and  delivery  of  this  Agreement  by  exchange of facsimile copies bearing the
facsimile  signature  of  a  Party  hereto  shall constitute a valid and binding
execution  and  delivery  of this Agreement by such Party. Such facsimile copies
shall  constitute  enforceable  original  documents.

     7.10  SURVIVAL  OF  REPRESENTATIONS AND WARRANTIES. All representations and
warranties  contained  herein  shall  survive the execution and delivery of this
Agreement,  any investigation at any time made by or on behalf of Purchaser, and
the  sale  and  purchase of the Shares and payment therefor until the earlier of
(a) the resale of any Shares issued pursuant to this Agreement, or (b) the first
anniversary  of  the  Effective  Date.

     7.11  SEVERABILITY.  If any provision of this Agreement is declared invalid
by  a  court of last resort or by any court from the decision of which an appeal
is  not  taken  within  the  time  provided by law, then and in such event, this
Agreement  will be deemed to have been terminated only as to the portion thereof
which relates to the provision invalidated by that decision, but this Agreement,
in  all  other  respects  will  remain  in force; provided, however, that if the
provision  so  invalidated  is  essential to this Agreement as a whole, then the
Parties  shall  negotiate  in  good faith to amend the terms hereof as nearly as
practical  to  carry  out  the  original  intent  of  the  Parties.

     IN  WITNESS WHEREOF, the Parties have executed this Agreement by their duly
authorized  representatives  as  of  the  date  first  written  above.

Company:                                Purchaser:

Exelixis,  Inc.                         Bristol-Myers  Squibb  Company



By:                                     By:
   -----------------------------           ------------------------------


Title:                                  Title:
      --------------------------              ---------------------------


                                        By:
                                           ------------------------------


                                        Title:
                                              ---------------------------


Section 3.7 Schedule of Exceptions The Company regularly enters into negotiations for and discussions regarding collaborative arrangements, an acquisition or merger or other similar transactions, which negotiations and discussions may include terms involving the sale, assignment or transfer of the Company's patents, trademarks, copyrights, trade secrets or other intangible assets, and may further include discussions regarding a sale or transfer of substantial portions of its assets, properties or business.

EXHIBIT A FORM OF COOLEY GODWARD LLP OPINION COOLEY GODWARD LLP Broomfield, CO ATTORNEYS AT LAW 720 566-4000 Five Palo Alto Square Denver, CO 3000 El Camino Real 303 606-4800 Palo Alto, CA 94306-2155 Kirkland, WA Main 650 843-5000 425 893-7700 Menlo Park, CA ROBERT L. JONES 650 843-5100 650 843-5034 jonesrl@cooley.com July [___], 2001 Bristol-Myers Squibb Company Route 206 and Providence Line Road Princeton, New Jersey 08543 RE: EXELIXIS, INC. PRIVATE PLACEMENT Ladies and Gentlemen: We have acted as counsel for Exelixis, Inc., a Delaware corporation (the "Company"), in connection with the issuance and sale to you of an aggregate of [__________] shares (the "Shares") of the Company's common stock, par value $.001 per share (the "Common Stock"), under the Stock Purchase Agreement, dated as of the date hereof (the "Purchase Agreement"), by and between the Company and you (the "Purchaser"). We are rendering this opinion pursuant to Section [___] of the Purchase Agreement. Except as otherwise defined herein, capitalized terms used but not defined herein have the respective meanings given to them in the Purchase Agreement. In connection with this opinion, we have examined and relied upon the representations and warranties as to factual matters contained in, and made pursuant to, the Purchase Agreement by the various parties thereto, and have examined and relied upon the originals or copies of such records, documents, certificates, opinions, memoranda and other instruments as in our judgment are necessary or appropriate to enable us to render the opinions expressed below. As to certain factual matters, we have relied upon certificates of officers of the Company and have not sought to independently verify such matters. Where we render an opinion "to the best of our knowledge" or concerning an item "known to us" or our opinion otherwise refers to "our knowledge," it is based solely upon (i) an inquiry of attorneys within this firm who perform legal services for the Company; (ii) review of certificates executed by an officer of the Company covering such matters; and (iii) such other investigation, if any, that we specifically set forth herein. In rendering this opinion, we have assumed: the genuineness and authenticity of all signatures on original documents; the authenticity of all documents submitted to us as originals; the conformity to originals of all documents submitted to us as copies; the accuracy, completeness and authenticity of certificates of public officials; and the due authorization, execution and delivery of all documents (except the due authorization, execution and delivery by the Company of the Purchase Agreement) where authorization, execution and delivery are prerequisites to the effectiveness of such documents. We have also assumed: that all individuals executing and delivering documents in their individual capacities had the legal capacity to so execute and deliver; that the Purchase Agreement is an obligation binding upon you; that you have received all documents that you were to receive under the Purchase Agreement; if you are a corporation or other entity, that you have filed any required California franchise tax or income tax returns and have paid any required California franchise or income taxes; and that there are no extrinsic agreements or understandings among the parties to the Purchase Agreement that would modify or interpret the terms thereof or the respective rights or obligations of the parties thereunder. We express no opinion herein concerning any laws other than the laws of the State of California, the General Corporation Law of the State of Delaware and the federal securities laws of the United States. We express no opinion as to whether the laws of any particular jurisdiction apply, and no opinion that the laws of any jurisdiction other than those identified above are applicable to the subject matter hereof. We are not rendering any opinion as to compliance with any antifraud law, rule or regulation relating to securities or the sale or issuance thereof. With regard to our opinion in paragraph 1 below, we have relied solely on (i) a certificate of an officer of the Company as to the states in which the Company owns or leases property or otherwise has any assets, employees or representatives authorized to bind it by contract and (ii) an examination of certificates of good standing or documents of similar import issued by the jurisdictions indicated in such officer's certificate; we have made no further investigation. On the basis of the foregoing, in reliance thereon and with the foregoing qualifications, we are of the opinion that: 1. The Company has been duly incorporated, is validly existing as a corporation in good standing under the laws of the State of Delaware and is duly qualified to transact business and is in good standing in California and, to the best of our knowledge, in each United States jurisdiction in which the conduct of its business or its ownership or leasing of property requires such qualification, except to the extent that the failure to be so qualified or be in good standing would not have a material adverse effect on the Company. 2. The Company has the corporate power and authority to own or lease its property and to conduct its business as currently conducted and as described in the SEC Reports, and to enter into the Purchase Agreement, issue the Shares and to carry out and perform its obligations under the Purchase Agreement. 3. The Purchase Agreement has been duly authorized, executed and delivered by, and is a legal, valid and binding agreement of, the Company, enforceable in accordance with its terms, subject to applicable bankruptcy, insolvency or similar laws affecting creditors' rights generally and general principles of equity and except as rights to indemnification and contribution in Section [__] thereof may be limited under applicable law. 4. The Shares have been duly authorized and, when issued and delivered in accordance with the terms of the Purchase Agreement, will be validly issued, fully paid and non-assessable, and the issuance of such Shares will not be subject to any preemptive or, to our knowledge, similar rights. 5. The execution and delivery of the Purchase Agreement by the Company and the filing of the Registration Statement pursuant to the Purchase Agreement (assuming such filing occurs at the time of Closing) will not result in any violation of, be in conflict with, or constitute a default under, with or without the passage of time (assuming no changes in currently existing laws) or the giving of notice of (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 and of which we have knowledge; or (iii) any material contract, obligation or commitment to which the Company is a party and which has been filed by the Company as an exhibit to the SEC Reports. 6. Other than as described in the SEC Reports, to the best of our knowledge, there are no legal actions, suits, arbitrations or other legal, administrative or governmental proceedings pending or threatened against the Company or its properties, assets or business, which, if adversely determined, would, individually or in the aggregate, affect the execution and delivery of the Purchase Agreement or have a material adverse effect on the Company. 7. Based upon the representations, warranties and agreements of the Purchaser in Section [4] of the Purchase Agreement, the offer and sale of the Shares to the Purchaser under the Purchase Agreement are exempt from the registration requirements of the Securities Act. These opinions are limited to the matters expressly stated herein and are rendered solely for your benefit and may not be quoted or relied upon for any other purpose or by any other person, firm or entity without our prior written consent. Very truly yours, Cooley Godward llp Robert L. Jones

                                                                    EXHIBIT 23.1

                       CONSENT OF INDEPENDENT ACCOUNTANTS

We  hereby  consent  to  the  incorporation  by  reference  in this Registration
Statement  on  Form  S-3  of  our  report dated February 2, 2001 relating to the
consolidated  financial  statements,  which  appears  in Exelixis, Inc.'s Annual
Report on Form 10-K for the year ended December 31, 2000. We also consent to the
reference  to  us  under  the  heading "Experts" in such Registration Statement.


/s/  PricewaterhouseCoopers  LLP

San  Jose,  California
August  23,  2001