SUGEN INC
DEF 14A, 1997-04-09
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                            SCHEDULE 14A INFORMATION
                PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE
                         SECURITIES EXCHANGE ACT OF 1934
                         (Amendment No. ______________)


Filed by the Registrant    /X/
Filed by a party other than the Registrant   / /

Check the appropriate box:
/ /  Preliminary proxy statement
/ /  Confidential, for use of the Commission only (as permitted by
     Rule 14a-6(e)(2))
/X/  Definitive proxy statement
/ /  Definitive additional materials
/ /  Soliciting material pursuant to Sec. 240.14a-11(c) or Sec. 240.14a-12

                                  Sugen, Inc.
                ------------------------------------------------
                (Name of Registrant as Specified in Its Charter)


    ------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)


Payment of filing fee (Check the appropriate box):

/X/  No fee required.
     

/ /  Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.


(1)  Title of each class of securities to which transactions applies:

- ----------------------------------------------------------------------------

(2)  Aggregate number of securities to which transactions applies:

- ----------------------------------------------------------------------------

(3)  Per unit price or other underlying value of transaction computed
pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing
fee is calculated and state how it was determined):

- ----------------------------------------------------------------------------

(4)  Proposed maximum aggregate value of transaction:

- ----------------------------------------------------------------------------

(5)  Total fee paid:

- ----------------------------------------------------------------------------

/ /  Fee paid previously with preliminary materials.
/ /  Check box if any part of the fee is offset as provided by Exchange Act
     Rule 0-11(a)(2) and identify the filing for which the offsetting fee
     was paid previously.  Identify the previous filing by registration
     statement number, or the Form or Schedule and the date of its filing.

(1)  Amount previously paid:

- ----------------------------------------------------------------------------

(2)  Form, Schedule or Registration Statement No.:

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(3)  Filing party:

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(4)  Date filed:

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<PAGE>
                                 SUGEN, INC.

                             351 GALVESTON DRIVE
                        REDWOOD CITY, CALIFORNIA 94063

                          ----------------------------

                   NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
                          TO BE HELD ON MAY 21, 1997

                          ----------------------------

TO THE STOCKHOLDERS OF SUGEN, INC.:

   NOTICE IS HEREBY  GIVEN that the Annual  Meeting  of  Stockholders  of SUGEN,
INC., a Delaware corporation (the "Company"), will be held on Wednesday, May 21,
1997 at 10:00 a.m.  local time at the  offices  of the  Company,  located at 351
Galveston Drive, Redwood City, California, 94063, for the following
purposes:

   1. To elect four  directors to hold office  until the 2000 Annual  Meeting of
      Stockholders.

   2. To  approve an  amendment  to the  Company's  1992  Stock  Option  Plan as
      amended,  to  increase  the  aggregate  number of  shares of Common  Stock
      available for issuance under the Plan by 650,000 shares.

   3. To ratify the  selection of Ernst & Young LLP as  independent  auditors of
      the Company for its fiscal year ending December 31, 1997.

   4. To transact such other business as may properly come before the meeting or
      any adjournment or postponement thereof.

   The  foregoing  items of  business  are more  fully  described  in the  Proxy
Statement accompanying this Notice.

   The Board of Directors  has fixed the close of business on March 24, 1997, as
the record date for the determination of stockholders  entitled to notice of and
to vote at this Annual Meeting and at any adjournment or  postponement  thereof.




                                  By Order of the Board of Directors 


          
                                  RICHARD D. SPIZZIRRI
                                  Secretary

Redwood City, California
April 9, 1997


ALL STOCKHOLDERS ARE CORDIALLY INVITED TO ATTEND THE MEETING IN PERSON.  WHETHER
OR NOT YOU EXPECT TO ATTEND THE MEETING, PLEASE COMPLETE,  DATE, SIGN AND RETURN
THE   ENCLOSED   PROXY  AS   PROMPTLY  AS  POSSIBLE  IN  ORDER  TO  ENSURE  YOUR
REPRESENTATION  AT THE MEETING.  A RETURN  ENVELOPE (WHICH IS POSTAGE PREPAID IF
MAILED IN THE UNITED  STATES) IS  ENCLOSED  FOR THAT  PURPOSE.  EVEN IF YOU HAVE
GIVEN YOUR PROXY, YOU MAY STILL VOTE IN PERSON IF YOU ATTEND THE MEETING. PLEASE
NOTE, HOWEVER, THAT IF YOUR SHARES ARE HELD OF RECORD BY A BROKER, BANK OR OTHER
NOMINEE  AND YOU WISH TO VOTE AT THE  MEETING,  YOU MUST  OBTAIN FROM THE RECORD
HOLDER A PROXY ISSUED IN YOUR NAME.

<PAGE>

                                 SUGEN, INC.

                             351 GALVESTON DRIVE
                        REDWOOD CITY, CALIFORNIA 94063

                          ----------------------------

                                 PROXY STATEMENT
                       FOR ANNUAL MEETING OF STOCKHOLDERS
                                  MAY 21, 1997

                          ----------------------------

                 INFORMATION CONCERNING SOLICITATION AND VOTING

GENERAL

   The enclosed proxy is solicited on behalf of the Board of Directors of SUGEN,
Inc., a Delaware  corporation (the "Company"),  for use at the Annual Meeting of
Stockholders  (the "Annual  Meeting") to be held on May 21, 1997,  at 10:00 a.m.
local time, or at any adjournment or postponement  thereof, for the purposes set
forth  herein  and in the  accompanying  Notice of Annual  Meeting.  The  Annual
Meeting  will be held at the offices of the  Company,  located at 351  Galveston
Drive,  Redwood City,  California  94063. The Company intends to mail this proxy
statement  and  accompanying  proxy  card on or  about  April  9,  1997,  to all
stockholders entitled to vote at the Annual Meeting.

SOLICITATION

   The Company will bear the entire cost of solicitation  of proxies,  including
preparation,  assembly,  printing and mailing of this proxy statement, the proxy
and any additional information furnished to stockholders. Copies of solicitation
materials  will  be  furnished  to  banks,  brokerage  houses,  fiduciaries  and
custodians  holding in their names shares of Common Stock  beneficially owned by
others to forward to such beneficial  owners.  The Company may reimburse persons
representing  beneficial  owners of Common  Stock for their costs of  forwarding
solicitation  materials to such  beneficial  owners.  Original  solicitation  of
proxies  by  mail  may  be  supplemented  by  telephone,  telegram  or  personal
solicitation  by  directors,  officers or other  employees  of the  Company.  No
additional  compensation will be paid to directors,  officers or other employees
for such services.

VOTING RIGHTS AND OUTSTANDING SHARES

   Only  holders of record of Common Stock at the close of business on March 24,
1997,  (the  "Record  Date"),  will be  entitled to notice of and to vote at the
Annual  Meeting.  At the close of business on the Record  Date,  the Company had
outstanding and entitled to vote 13,040,290, shares of Common Stock. Each holder
of record of Common  Stock on the Record  Date will be  entitled to one vote for
each share held on all matters to be voted upon at the Annual Meeting. 

   All votes will be tabulated by the  inspector of election  appointed  for the
meeting,   who  will  separately   tabulate   affirmative  and  negative  votes,
abstentions  and  broker  non-votes.  Abstentions  will be counted  towards  the
tabulation  of votes cast on proposals  presented to the  stockholders  and will
have the same effect as negative votes.  Broker  non-votes are counted towards a
quorum, but are not counted for any purpose in determining  whether a matter has
been approved.

REVOCABILITY OF PROXIES

   Any person  giving a proxy  pursuant  to this  solicitation  has the power to
revoke it at any time  before it is voted.  It may be revoked by filing with the
Secretary  of the  Company at the  Company's  principal  executive  office,  351
Galveston Drive, Redwood City,  California 94063, a written notice of revocation
or a duly executed proxy bearing a later date, or it may be revoked by attending
the meeting and voting in person. Attendance at the meeting will not, by itself,
revoke a proxy.

                                        1
<PAGE>

STOCKHOLDER PROPOSALS


   Proposals of stockholders  that are intended to be presented at the Company's
1998 Annual  Meeting of  Stockholders  must be received by the Company not later
than December 10, 1997, in order to be included in the proxy statement and proxy
relating to that Annual Meeting. 

                                  PROPOSAL 1
                            ELECTION OF DIRECTORS

   The Company's  Restated  Certificate of Incorporation and Bylaws provide that
the  Board  of  Directors  shall be  divided  into  three  classes,  each  class
consisting,  as  nearly  as  possible,  of  one-third  of the  total  number  of
directors,  with each class having a three-year term. Vacancies on the Board may
be filled only by persons  elected by a majority of the remaining  directors.  A
director elected by the Board to fill a vacancy  (including a vacancy created by
an increase in the size of the Board of Directors) shall serve for the remainder
of the full term of the class of  directors  in which the vacancy  occurred  and
until such director's successor is elected and qualified.

   The Board of  Directors is presently  composed of eleven  members.  There are
four  directors in the class whose term of office  expires in 1997.  Each of the
nominees for  election to this class is currently a director of the Company.  If
elected at the Annual  Meeting,  each of the nominees would serve until the 2000
Annual Meeting and until his or her successor is elected and has  qualified,  or
until such director's earlier death, resignation or removal.

   Directors  are  elected  by a  plurality  of the votes  present  in person or
represented by proxy and entitled to vote at the meeting.  Shares represented by
executed  proxies will be voted, if authority to do so is not withheld,  for the
election of the four nominees named below.  In the event that any nominee should
be unavailable for election as a result of an unexpected occurrence, such shares
will be voted for the  election of such  substitute  nominee as  management  may
propose.  Each person nominated for election has agreed to serve if elected, and
management has no reason to believe that any nominee will be unable to serve.

   Set forth below is  biographical  information  for each person  nominated and
each person whose term of office as a director  will  continue  after the Annual
Meeting.

NOMINEES FOR ELECTION FOR A THREE-YEAR TERM EXPIRING AT THE 2000 ANNUAL MEETING

   Charles  M.  Hartman,  55,  has served as a  director  of the  Company  since
December  1991.  He has been a general  partner of CW Group,  a venture  capital
partnership,  since 1983. Mr. Hartman is a director of Ribozyme Pharmaceuticals,
Inc., Geron Corporation and several  privately-held  life sciences  companies as
well as The Hastings Center, a nonprofit  organization dedicated to the study of
ethics in medicine and life sciences.

   Donald E.  Nickelson,  64,  has  served as a director  of the  Company  since
October  1992.  Mr.  Nickelson  served as  President  of  PaineWebber  Group,  a
brokerage  service and investment  banking company,  from 1988 until retiring in
1990.  He also served as a director of  PaineWebber  Group from 1980 until 1993.
Mr.  Nickelson serves as Chairman of the Boards of Greenfield  Industries,  Inc.
and Omniquip  International,  Inc.  and also as Trustee of The  Mainstay  Mutual
Funds.  He serves as Director of Corporate  Properties  10, Carey  Institutional
Properties, Inc., DTI Industries, Harbour Group and Allied Health Care Products,
Inc.

   Bruce R. Ross, 56, was appointed as a director of the Company in August 1994.
From  1980 to  March  1994,  when he  retired,  Mr.  Ross  held  various  senior
management positions with Bristol-Myers Squibb, an international  pharmaceutical
company, including Vice President,  Bristol-Myers Oncology Division,  President,
U.S.  Pharmaceutical  Group  and  Senior  Vice  President,  Policy,  Planning  &
Development.  Mr. Ross is currently the Chief Executive  Officer of the National
Comprehensive  Cancer  Network  and  currently  serves as a director  of Cytogen
Corporation and the Fox Chase Cancer Center.

   Richard D.  Spizzirri,  64, has served as a  director  of the  Company  since
December 1991 and as Secretary  since May 1992.  Mr.  Spizzirri was a partner at
the law firm of Davis, Polk & Wardwell from 1967

                                        2
<PAGE>

to December  1994,  when he retired.  He continues to serve as senior counsel to
Davis,  Polk  &  Wardwell  and  as a  director  of  Centocor,  Inc.  and  Stuart
Entertainment, Inc.

             MANAGEMENT AND THE BOARD OF DIRECTORS RECOMMEND A VOTE
                        IN FAVOR OF EACH NAMED NOMINEE.

DIRECTORS CONTINUING IN OFFICE UNTIL THE 1998 ANNUAL MEETING

   Stephen  Evans-Freke,  45, a  founder  of the  Company,  has  served as Chief
Executive  Officer and Chairman of the Board of the Company since its inception.
Mr.  Evans-Freke  was also a founder of Selectide  Corporation,  a biotechnology
company based on combinatorial chemistry screening technology, and served as its
Chairman of the Board from 1990 until its  acquisition  by Marion  Merrell  Dow,
Inc.  in January  1995.  From 1976 to 1990,  Mr.  Evans-Freke  was  employed  by
PaineWebber  Incorporated,  a brokerage service and investment  banking company,
and served most  recently as a member of its Board of Directors and President of
PaineWebber Development Corporation,  a subsidiary of PaineWebber  Incorporated.
He is also involved  with various  private  companies,  serving as a director of
Pharmaceutical  Partners LLC, President of International  Technology  Investment
Managers,  Inc. and Chairman of  International  Technology  Investment  Managers
(Asia)  Inc.  Mr.  Evans-Freke  formerly  served  as  a  director  of  Genentech
Development  Corporation,  Amgen  Development  Corporation and a number of other
companies. Mr. Evans-Freke received a degree in Law from Cambridge University.

   Anthony B. Evnin,  Ph.D.,  56, has served as a director of the Company  since
December 1991.  Dr. Evnin has been a general  partner of Venrock  Associates,  a
venture   capital   partnership,   since  1975.   He  is  a  director  of  Arris
Pharmaceutical Corporation,  Centocor, Inc., Opta Food Ingredients,  Inc., Kopin
Corporation, Ribozyme Pharmaceuticals,  Inc., Triangle Pharmaceuticals, Inc. and
several private companies.

   Axel Ullrich, Ph.D., 53, a founder of the Company, has served as a consultant
to the Company in his  capacity as Co-Chief  Scientist  and has been a member of
the Board of  Directors  of the Company  since its  inception.  Since 1988,  Dr.
Ullrich  has  served  as  Director,   Department  of  Molecular  Biology,   Max-
Planck-Institut fur Biochemie, a research institute of the Max-Planck Society, a
German government- funded organization of over eighty research institutes.

DIRECTORS CONTINUING IN OFFICE UNTIL THE 1999 ANNUAL MEETING

   Heinrich  Kuhn,  61, has served as a director of the Company  since  December
1991. Since 1979 he has served as Managing Director of Garching Innovation GmbH,
the technology transfer agency of the Max-Planck Society.

   Jeremy L.  Curnock  Cook,  47, was  appointed as a director of the Company in
December 1996. Mr. Curnock Cook has been Head of the Rothschild  Bioscience Unit
and a director of  Rothschild  Asset  Management  Limited  since  1987.  He is a
director of several British  companies,  including  International  Biotechnology
Trust plc, Biocompatibles  International plc, Therexsys Ltd. and Vanguard Medica
Group plc. He also serves on the Boards of Directors of Cell Therapeutics, Inc.,
Creative Biomolecules,  Inc., Targeted Genetics Corp. and Ribozyme,  Inc. in the
United States.

   Glenn S. Utt, Jr., 70, has served as a director of the Company since December
1991.  From 1962 to 1983,  when Mr. Utt  retired,  he served as  Executive  Vice
President of Abbott  Laboratories,  Inc., a hospital,  laboratory and diagnostic
products company,  President of its  Pharmaceutical  Division and as a member of
its Board of Directors. He is also Chairman of Janmar, Inc.

   Michael A. Wall,  68, has served as a director of the Company since  December
1991.  From 1979 to 1987,  when he  retired,  Mr.  Wall  served as  Chairman  of
Centocor,  Inc.,  and  continued  to serve as a member of its Board of Directors
until 1993. He has  participated  as a founder,  director,  or manager of over a
dozen  technology  firms  since  1955.  Mr.  Wall is also a  director  of  Kopin
Corporation and is Chairman of the Board of Directors of Alkermes, Inc.

HONORARY MEMBER OF THE BOARD

   Joseph  Schlessinger,  Ph.D.,  52, a founder of the Company,  has served as a
consultant to the Company in his capacity as Co-Chief  Scientist,  as well as an
honorary member of the Board of Directors, since its

                                        3
<PAGE>

inception.  He has served as a  professor  and  Chairman  of the  Department  of
Pharmacology at New York  University  Medical Center since 1990, and as the Ruth
and Leonard  Simon  Professor in Cancer  Research in the  Department of Chemical
Immunology at the Weizmann Institute of Science in Rehovot,  Israel, since 1984.
He was formerly  Director of Research for Rorer  Biotechnology,  a biotechnology
company.

BOARD COMMITTEES AND MEETINGS

   During the fiscal year ended  December 31, 1996 the Board of  Directors  held
five  meetings.  The  Board has  delegated  certain  of its  powers to its Audit
Committee, Compensation Committee and Executive Committee.

   The Audit  Committee meets with the Company's  independent  auditors at least
annually  to review the results of the annual  audit and  discuss the  financial
statements; recommends to the Board the independent auditors to be retained; and
receives and considers the auditors' comments as to controls,  adequacy of staff
and management performance and procedures in connection with audit and financial
controls.  The Audit  Committee  is  composed of three  non-employee  directors:
Messrs. Hartman (Chairman),  Nickelson and Spizzirri.  It met twice during 1996.
All members attended both meetings with the exception of Mr.
Nickelson who attended one meeting.

   The  Compensation  Committee makes  recommendations  concerning  salaries and
incentive  compensation for executive  officers,  grants stock options under the
Company's 1992 Stock Option Plan and 1995 Long-Term Objectives Stock Option Plan
for Senior Management and otherwise determines  compensation levels and performs
such other  functions  regarding  compensation  as the Board may  delegate.  The
Compensation  Committee  is composed of three  non-employee  directors:  Messrs.
Evnin,  Utt and Wall  (Chairman).  In  addition  to actions  taken by  unanimous
consent, the Compensation Committee met once during the last fiscal year.

   The Executive Committee consists of Messrs.  Evans-Freke  (Chairman),  Evnin,
Hartman,  Nickelson and Ross. The Board has delegated its power and authority to
manage and  operate  the  Company in the  ordinary  course of  business  to this
committee,  including the securing of debt financing and lease transactions. The
Board retains the power to issue shares of stock, declare a dividend and adopt a
certificate  of ownership  and merger on behalf of the  Company.  In addition to
actions taken by unanimous consent,  the Executive Committee met once during the
last fiscal year.

   The Board of Directors has no standing nominating  committee or any committee
performing the functions of such committee.

   During the fiscal year ended December 31, 1996, with the exception of Messrs.
Nickelson and Wall, who attended 60%, all incumbent  directors attended at least
80% of the  aggregate  of the  meetings  held of the Board during the period for
which they were a director.

                                        4
<PAGE>

                                   MANAGEMENT

   Executive  officers  are  appointed  annually  by the  Board and serve at the
discretion  of the  Board.  Set  forth  below  are  the  names  of  and  certain
biographical information concerning the executive officers of the Company.

 NAME                        AGE                     POSITION
 ----                        ---                     --------
K. Peter Hirth, Ph.D.  ....  45   Executive Vice President and Chairman of the
                                  Research and Development Committee
Sara A. Courtneidge, Ph.D.   43   Senior Vice President, Research
Christine E. Gray-Smith  ..  48   Vice President, Finance and Assistant
                                  Secretary
Laura K. Shawver, Ph.D.  ..  39   Vice President, Preclinical and Pharmaceutical
                                  Development

   K. Peter Hirth, Ph.D., Executive Vice President, and Chairman of the Research
and  Development  Committee,  joined the Company in March 1992.  Dr.  Hirth held
several  positions  with  Boehringer  Mannheim  GmbH,  a  German  pharmaceutical
company,  from August 1984 to December 1991, most recently as Vice President and
Head of Immunopharmacology, Allergy, Virology and Microbiology.

   Sara A.  Courtneidge,  Ph.D.,  Senior Vice  President,  Research,  joined the
Company in November 1994. Dr. Courtneidge was employed by the European Molecular
Biology  Laboratory,  an  international  molecular  biology  research  center in
Heidelberg,  Germany, from August 1985 to September 1994, first as Group Leader,
and most recently as Senior Scientist,  Differentiation  Programme. From January
1981 to July 1985, Dr.  Courtneidge was a member of the Scientific  Staff at the
National Institute of Medical Research, London, England.

   Christine E.  Gray-Smith,  Vice President,  Finance and Assistant  Secretary,
joined the Company in August 1994.  From July 1992 to July 1994, Ms.  Gray-Smith
served as Vice President and Chief Financial Officer of Worldtalk Corporation, a
messaging  integration  software  company,  and from  July 1988 to June 1992 she
served as Controller of Power Up Software  Corporation,  a software  development
company. Ms. Gray-Smith,  a certified public accountant,  previously served as a
principal  (senior  manager) of Arthur Young & Company,  an accounting  firm and
predecessor of Ernst & Young LLP.

   Laura K. Shawver,  Ph.D.,  Vice  President,  Preclinical  and  Pharmaceutical
Development, joined the Company in June 1992. From August 1989 to June 1992, Dr.
Shawver held several positions at Berlex Biosciences,  most recently as Director
of Cell Biology and Immunology.  Dr. Shawver also served as a research associate
in the  Department  of  Hematology  and  Oncology  at  the  Jewish  Hospital  at
Washington  University from 1986 to August 1989. Dr. Shawver  received her Ph.D.
in  Pharmacology  from the  University of Iowa and  completed  her  postdoctoral
fellowship in the Department of Microbiology at the University of Virginia.

   See  "Proposal 1 --  Election  of  Directors"  for  biographical  information
concerning the Company's executive officers who are also directors.

                                   PROPOSAL 2

                    APPROVAL OF AN AMENDMENT TO THE COMPANY'S
                             1992 STOCK OPTION PLAN

   In  February  1992,  the Board of  Directors  adopted,  and the  stockholders
subsequently approved, the Company's 1992 Stock Option Plan (the "Option Plan").
As a result of a series of amendments, at December 31, 1996 there were 2,100,000
shares of the Company's  Common Stock  authorized  for issuance under the Option
Plan.

   Through March 14, 1997,  stock  options (net of canceled or expired  options)
covering an aggregate of 2,253,585 shares of the Company's Common Stock had been
granted under the Option Plan, of which options to purchase  153,585 shares (net
of canceled or expired  options)  are  subject to  stockholder  approval of this
Proposal 2.

                                        5
<PAGE>

   In December 1996, the Board of Directors  approved an amendment to the Option
Plan, subject to stockholder  approval,  to enhance the flexibility of the Board
in granting stock options to employees,  officers,  directors and consultants of
the  Company.  The  amendment  increases  the  number of shares  authorized  for
issuance under the Option Plan by 650,000 shares, from an aggregate of 2,100,000
shares to a total of 2,750,000  shares.  The Board  approved  this  amendment to
ensure that the Company can continue to grant stock options at levels determined
appropriate by the Board.

   Stockholders are requested in this Proposal 2 to approve the amendment to the
Option Plan, as amended.  The  affirmative  vote of the holders of a majority of
the shares present in person or represented by proxy and entitled to vote at the
meeting will be required to approve the Option Plan, as amended.

                 MANAGEMENT AND THE BOARD OF DIRECTORS RECOMMEND
                         A VOTE IN FAVOR OF PROPOSAL 2.

   The essential features of the Option Plan are outlined below:

GENERAL

   Incentive stock options granted under the Option Plan are intended to qualify
as "incentive  stock options"  within the meaning of Section 422 of the Internal
Revenue  Code of 1986,  as amended  (the  "Code").  Nonstatutory  stock  options
granted  under the Option Plan are intended  not to qualify as  incentive  stock
options under the Code. See "Federal Income Tax Information" for a discussion of
the tax treatment of the various options included in the Option Plan.

PURPOSE

   The Option Plan was adopted to provide a means by which employees  (including
officers and employee directors) of and selected  consultants to the Company and
its affiliates could be given an opportunity to receive stock in the Company, to
assist in retaining the services of employees  holding key positions,  to secure
and retain the  services of persons  capable of filling  such  positions  and to
provide  incentives for such persons to exert maximum efforts for the success of
the Company.  All full-time regular employees are eligible to participate in the
Option Plan.

ADMINISTRATION

   The Option Plan is administered by the Board of Directors of the Company. The
Board has the power to construe and  interpret  the Option Plan and,  subject to
the  provisions  of the Option Plan,  to  determine  the persons to whom and the
dates on which options will be granted, what type of option will be granted, the
number of shares to be subject to each option, the time or times during the term
of each option  within  which all or a portion of such option may be  exercised,
the exercise price, the type of consideration and other terms of the option. The
Board of Directors is authorized to delegate  administration  of the Option Plan
to a  committee  composed  of at least two  members of the Board.  The Board has
delegated administration of the Option Plan to the Compensation Committee of the
Board. As used herein with respect to the Option Plan, the "Board" refers to the
Compensation Committee as well as to the Board of Directors itself.

ELIGIBILITY

   Incentive  stock  options  may be  granted  under  the  Option  Plan  only to
employees  (including  officers and employee  directors)  of the Company and its
affiliates.   Consultants  and  employees   (including   officers  and  employee
directors) are eligible to receive  options other than  incentive  stock options
under  the  Option  Plan.  Directors  who  are  not  salaried  employees  of  or
consultants  to the Company or to any  affiliate of the Company are not eligible
to participate in the Option Plan.

   No option may be granted under the Option Plan to any person who, at the time
of the grant,  owns (or is deemed to own) stock  possessing more than 10% of the
total  combined  voting  power of the Company or any  affiliate  of the Company,
unless the option  exercise  price is at least 110% of the fair market  value of
the stock subject to the option on the date of grant, and the term of the option
does not exceed five years from the date of grant.  For incentive  stock options
granted under the Option Plan,  the aggregate  fair market value,  determined at
the time of grant, of the shares of Common Stock with respect

                                        6
<PAGE>

to which such options are  exercisable  for the first time by an optionee during
any calendar year (under all such plans of the Company and its  affiliates)  may
not exceed $100,000. No person may be granted options covering more than 434,527
shares of Common Stock in any calendar year.

STOCK SUBJECT TO THE INCENTIVE PLAN

   Subject to stockholder approval of this Proposal 2, an aggregate of 2,750,000
shares of Common  Stock is  reserved  for  issuance  under the Option  Plan.  If
options  granted  under the Option Plan expire or  otherwise  terminate  without
being exercised,  the Common Stock not purchased  pursuant to such options again
becomes available for issuance under the Option Plan.

TERMS OF OPTIONS

   The following is a description of the permissible  terms of options under the
Option Plan.  Individual  option grants may be more restrictive as to any or all
of the permissible terms described below.

   Exercise Price;  Payment. The exercise price of incentive stock options under
the Option Plan may not be less than the fair market  value of the Common  Stock
subject to the option on the date of the  option  grant,  and in some cases (see
"Eligibility"  above),  may not be less than 110% of such fair market value. The
exercise  price of  nonstatutory  options  under the Option Plan may not be less
than 85% of the fair market value of the Common  Stock  subject to the option on
the date of the option grant,  and in some cases (see  "Eligibility"  above) may
also not be less than 110% of such fair market value.  However,  if options were
granted with exercise  prices below market value,  deductions  for  compensation
attributable  to the exercise of such options could be limited by Section 162(m)
of the Code.  See  "Federal  Income Tax  Information."  At March 14,  1997,  the
closing price of the Common Stock as reported on the Nasdaq  National Market was
$11.63 per share.

   In the event of a decline in the value of the Common Stock, the Board has the
authority to offer  employees  the  opportunity  to replace  outstanding  higher
priced  options,  whether  incentive  or  nonstatutory,  with new  lower  priced
options.  To the extent required by Section 162(m), an option repriced under the
Option Plan is deemed to be canceled and a new option  granted.  Both the option
deemed to be canceled  and the new option  deemed to be granted  will be counted
against the 434,527 per person share limitation.

   The  exercise  price of options  granted  under the Option  Plan must be paid
either:  (a)  in  cash  at the  time  the  option  is  exercised;  or (b) at the
discretion of the Board (i) by delivery of other Common Stock of the Company, or
(ii)  pursuant to a deferred  payment  arrangement;  or (c) in any other form of
legal consideration acceptable to the Board. 

   Option Exercise. Options granted under the Option Plan may become exercisable
in cumulative  increments ("vest") as determined by the Board. Shares covered by
currently  outstanding  options  under the Option Plan  typically  vest,  for an
optionee's initial grant, at the rate of 25% of the shares subject to the option
on  the  first  anniversary  of  the  date  of the  optionee's  commencement  of
employment  or  consultant  services and 1/12th of the  remaining  shares on the
first day of each quarter thereafter during the optionee's employment or service
as a consultant.  Subsequent grants to the optionee,  if any,  typically vest at
the rate of 1/16th per  quarter.  Shares  covered by options  granted  under the
Option Plan may be subject to different  vesting terms.  The Board has the power
to  accelerate  the time during which an option may be  exercised.  In addition,
options granted under the Option Plan may permit exercise prior to vesting,  but
in such event the optionee may be required to enter into an early exercise stock
purchase  agreement that allows the Company to repurchase  shares not yet vested
at their  exercise  price  should the  optionee  leave the employ of the Company
before vesting.  To the extent  provided by the terms of an option,  an optionee
may satisfy any federal,  state or local tax withholding  obligation relating to
the exercise of such option by a cash payment upon exercise,  by authorizing the
Company to withhold a portion of the stock  otherwise  issuable to the optionee,
by delivering  already-owned  stock of the Company or by a combination  of these
means.

   Term. The maximum term of options under the Option Plan is ten years,  except
that in certain  cases  (see  "Eligibility")  the  maximum  term is five  years.
Options under the Option Plan terminate within a

                                        7
<PAGE>

period specified by the Board (generally three months) after the optionee ceases
to be employed by the Company or any  affiliate of the  Company,  unless (a) the
termination of employment is due to such person's permanent and total disability
(as defined in the Code),  in which case the option may,  but need not,  provide
that it may be  exercised at any time within one year of such  termination;  (b)
the optionee dies while employed by the Company or any affiliate of the Company,
or within three months after  termination of such employment,  in which case the
option may, but need not,  provide  that it may be exercised  (to the extent the
option was exercisable at the time of the optionee's death) within twelve months
of the  optionee's  death by the  person or  persons  to whom the rights to such
option  pass by will or by the  laws of  descent  and  distribution;  or (c) the
option by its terms specifically provides otherwise. Individual options by their
terms  may  provide  for  exercise  within a  longer  period  of time  following
termination  of employment or the consulting  relationship.  The option term may
also be extended in the event that  exercise of the option  within these periods
is prohibited for specified reasons.

ADJUSTMENT PROVISIONS

   If there is any change in the stock  subject to the Option Plan or subject to
any  option  granted  under the  Option  Plan  (through  merger,  consolidation,
reorganization,  recapitalization,  stock  dividend,  dividend in property other
than cash, stock split, liquidating dividend, combination of shares, exchange of
shares, change in corporate structure or otherwise), the Option Plan and options
outstanding  thereunder will be  appropriately  adjusted as to the class and the
maximum  number of shares  subject to such plan,  the  maximum  number of shares
which may be granted to any person during a calendar year, and the class, number
of shares and price per share of stock subject to such outstanding options.

EFFECT OF CERTAIN CORPORATE EVENTS

   The Option Plan provides for automatic acceleration of vesting of outstanding
options granted under the Option Plan in the event of a change of control, which
includes (i) a merger or consolidation in which the Company is not the surviving
corporation;  (ii) a  reverse  merger  in which  the  Company  is the  surviving
corporation  but the  shares  of the  Company's  outstanding  common  stock  are
converted by virtue of the merger into other  property;  (iii) any other capital
reorganization  in which  more than  fifty  percent  (50%) of the  shares of the
Company  entitled to vote are exchanged;  (iv) a transaction or group of related
transactions  involving  the sale of all or  substantially  all of the Company's
assets; (v) certain acquisitions by a person,  entity or group of the beneficial
ownership of  securities  of the Company  representing  more than fifty  percent
(50%) of the  combined  voting  power in the  election  of  directors;  and (vi)
certain  changes in the  composition  of the Company's  Board of Directors  such
that,  during any  period of two  consecutive  years,  individuals  who,  at the
beginning of such period,  constitute the Board (including directors who at such
time were duly elected or nominated for election by the  Company's  stockholders
during such period),  cease for any reason to have  authority to cast at least a
majority of the votes which all directors on the Board are entitled to vote. The
acceleration  of an option in the event of an acquisition  or similar  corporate
event may be viewed as an antitakeover  provision,  which may have the effect of
discouraging a proposal to acquire or otherwise obtain control of the Company.

DURATION, AMENDMENT AND TERMINATION

   The Board may  suspend or  terminate  the  Option  Plan  without  stockholder
approval  or  ratification  at any  time or from  time to  time.  Unless  sooner
terminated, the Option Plan will terminate in February 2002.

   The Board may also  amend the  Option  Plan at any time or from time to time.
However,  no amendment will be effective  unless approved by the stockholders of
the Company  within  twelve  months before or after its adoption by the Board if
the  amendment  would:  (a)  modify  the  requirements  as  to  eligibility  for
participation (to the extent such modification  requires stockholder approval in
order for the Plan to satisfy  Section 422 of the Code, if  applicable,  or Rule
16b-3 ("Rule  16b-3") of the  Securities  Exchange Act of 1934,  as amended (the
"Exchange  Act"));  (b) increase the number of shares reserved for issuance upon
exercise of options;  or (c) change any other provision of the Plan in any other
way if such modification  requires  stockholder approval in order to comply with
Rule 16b-3 or satisfy the requirements of Section

                                        8
<PAGE>

422 of the Code. The Board may submit any other amendment to the Option Plan for
stockholder  approval,  including,  but not limited to,  amendments  intended to
satisfy the  requirements  of Section 162(m) of the Code regarding the exclusion
of  performance-based  compensation  from the limitation on the deductibility of
compensation paid to certain employees.

RESTRICTIONS ON TRANSFER

   Under the Option Plan, an incentive  stock option may not be  transferred  by
the optionee  otherwise than by will or by the laws of descent and  distribution
and, during the lifetime of an optionee,  an option may be exercised only by the
optionee.  A nonstatutory  stock option may not be transferred except by will or
by the laws of descent and  distribution  or pursuant to a  "qualified  domestic
relations  order." In addition,  any shares subject to repurchase by the Company
under an early exercise stock purchase  agreement may be subject to restrictions
on transfer which the Board deems appropriate.

FEDERAL INCOME TAX INFORMATION

   Incentive  Stock Options.  Incentive  stock options under the Option Plan are
intended to be eligible for the favorable federal income tax treatment  accorded
"incentive stock options" under the Code.

   There generally are no federal income tax consequences to the optionee or the
Company  by  reason of the  grant or  exercise  of an  incentive  stock  option.
However,  the exercise of an incentive  stock option may increase the optionee's
alternative minimum tax liability, if any.

   If an optionee holds stock acquired  through  exercise of an incentive  stock
option for at least two years  from the date on which the option is granted  and
at least one year  from the date on which  the  shares  are  transferred  to the
optionee upon exercise of the option,  any gain or loss on a disposition of such
stock  will be  long-term  capital  gain or  loss.  Generally,  if the  optionee
disposes of the stock before the  expiration of either of these holding  periods
(a "disqualifying  disposition"),  at the time of disposition, the optionee will
realize  taxable  ordinary  income  equal to the lesser of (a) the excess of the
stock's fair market value on the date of exercise  over the exercise  price,  or
(b) the optionee's actual gain, if any, on the purchase and sale. The optionee's
additional  gain,  or any loss,  upon the  disqualifying  disposition  will be a
capital gain or loss, which will be long-term or short-term depending on whether
the stock was held for more than one year. Long-term capital gains currently are
generally  subject to lower tax rates than ordinary income.  The maximum capital
gains rate for federal  income tax purposes is  currently  28% while the maximum
ordinary  income  rate  is  effectively  39.6%  at the  present  time.  Slightly
different  rules may apply to  optionees  who acquire  stock  subject to certain
repurchase options or who are subject to Section 16(b) of the Exchange Act.

   To the  extent  the  optionee  recognizes  ordinary  income  by  reason  of a
disqualifying  disposition,  the Company will generally be entitled  (subject to
the requirement of reasonableness,  the provisions of Section 162(m) of the Code
and the  satisfaction  of a reporting  obligation) to a  corresponding  business
expense deduction in the tax year in which the disqualifying disposition occurs.

   Nonstatutory  Stock  Options.  Nonstatutory  stock options  granted under the
Option Plan generally have the following federal income tax consequences:

   There are no tax consequences to the optionee or the Company by reason of the
grant of a  nonstatutory  stock option.  Upon exercise of a  nonstatutory  stock
option,  the optionee  normally will recognize  taxable ordinary income equal to
the excess of the  stock's  fair market  value on the date of exercise  over the
option  exercise  price.  Generally,  with respect to employees,  the Company is
required to withhold from regular wages or supplemental  wage payments an amount
based  on  the  ordinary  income  recognized.  Subject  to  the  requirement  of
reasonableness,   the   provisions  of  Section  162(m)  of  the  Code  and  the
satisfaction of a reporting  obligation,  the Company will generally be entitled
to a business expense deduction equal to the taxable ordinary income realized by
the optionee.  Upon  disposition  of the stock,  the optionee  will  recognize a
capital gain or loss equal to the  difference  between the selling price and the
sum of the amount  paid for such stock plus any amount  recognized  as  ordinary
income upon exercise of the option. Such gain or loss will be long or short-term
depending  on  whether  the  stock  was held for more  than one  year.  Slightly
different  rules may apply to  optionees  who acquire  stock  subject to certain
repurchase options or who are subject to Section 16(b) of the Exchange Act.

                                        9
<PAGE>

   Potential  Limitation on Company  Deductions.  As part of the Omnibus  Budget
Reconciliation  Act of 1993, the U.S.  Congress  amended the Code to add Section
162(m)  which  denies  a  deduction  to  any  publicly  held   corporation   for
compensation  paid to certain  employees  in a taxable  year to the extent  that
compensation  exceeds  $1,000,000  for a covered  employee.  It is possible that
compensation  attributable to stock options,  when combined with all other types
of compensation received by a covered employee,  may cause this limitation to be
exceeded in any particular year.

   Certain  kinds  of  compensation,   including  qualified   "performance-based
compensation,"  are  disregarded  for purposes of the deduction  limitation.  In
accordance  with Treasury  regulations  issued under Section 162(m) of the Code,
compensation  attributable  to stock  options will qualify as  performance-based
compensation,  provided that the option is granted by a  compensation  committee
comprised solely of "outside directors" and either: (i) the option plan contains
a  per-employee  limitation  on the  number of shares for which  options  may be
granted during a specified  period,  the per-employee  limitation is approved by
the stockholders,  and the exercise price of the option is no less than the fair
market  value of the stock on the date of grant;  or (ii) the  option is granted
(or  exercisable)  only upon the  achievement  (as  certified  in writing by the
compensation  committee) of an objective performance goal established in writing
by the compensation committee while the outcome is substantially  uncertain, and
the  option  is  approved  by the  stockholders.  The  Option  Plan  contains  a
per-employee, per-calendar year limitation of 434,527 shares, which was approved
by the Company's stockholders in 1995.

   The following table presents certain information,  as of March 14, 1997, with
respect  to  options  granted  under  the  Option  Plan  which  are  subject  to
stockholder  approval,  to (i) the Named  Executive  Officers (as defined  below
under "Executive Compensation -- Compensation of Executive Officers"),  (ii) all
executive officers as a group, and (iii) all non-executive  officer employees as
a group. No non-employee director was granted an option under the Option Plan in
1996 as a director.
<TABLE>

                              NEW PLAN BENEFITS

<CAPTION>
                                                                1992 STOCK OPTION PLAN
                                                          --------------------------------
                                                                              NUMBER OF     
                                                            DOLLAR VALUE  SHARES SUBJECT TO 
NAME AND POSITION                                               (1)        OPTIONS GRANTED
                                                          -------------- -----------------
<S>                                                           <C>            <C>        
Stephen Evans-Freke ......................................    $  511,875      45,000
 Chief Executive Officer and                                  
 Chairman of the Board                                        
K. Peter Hirth, Ph.D. ....................................       398,125      35,000
 Executive Vice President, and Chairman of the                
 Research and Development Committee                           
Sara A. Courtneidge, Ph.D. ...............................       227,500      20,000
 Senior Vice President, Research                              
Christine E. Gray-Smith ..................................       102,375       9,000
 Vice President, Finance and Assistant Secretary              
Laura K. Shawver, Ph.D. ..................................       170,625      15,000
 Vice President, Preclinical and Pharmaceutical               
 Development                                                  
All Executive Officers as a group (7 persons)  ...........     1,410,500     124,000
All Non-Executive Officer Employees as a                       
 Group (20 persons) ......................................       362,979      29,585
<FN>
                                                          
(1)  Exercise price multiplied by the number of shares underlying the option(s).
</FN>
</TABLE>

                                       10
<PAGE>

                                   PROPOSAL 3

                RATIFICATION OF SELECTION OF INDEPENDENT AUDITORS

   The  Board of  Directors  has  selected  Ernst & Young  LLP as the  Company's
independent  auditors  for the fiscal  year  ending  December  31,  1997 and has
further  directed that management  submit the selection of independent  auditors
for  ratification by the  stockholders at the Annual Meeting.  Ernst & Young LLP
began  auditing the Company's  financial  statements  with the fiscal year ended
December  31,  1992.  Representatives  of Ernst & Young LLP are  expected  to be
present at the Annual  Meeting,  will have an opportunity to make a statement if
they so desire and will be available to respond to appropriate questions.

   Stockholder  ratification  of the  selection  of  Ernst  &  Young  LLP as the
Company's  independent  auditors  is not  required  by the  Company's  Bylaws or
otherwise.  However,  the Board is submitting the selection of Ernst & Young LLP
to the stockholders for ratification as a matter of good corporate practice.  If
the stockholders fail to ratify the selection, the Audit Committee and the Board
will  reconsider  whether or not to retain that firm.  Even if the  selection is
ratified,  the Audit Committee and the Board in their  discretion may direct the
appointment  of  different  independent  auditors at any time during the year if
they  determine that such a change would be in the best interests of the Company
and its stockholders.

   The  affirmative  vote of the holders of a majority of the shares  present in
person or  represented  by proxy and entitled to vote at the Annual Meeting will
be required to ratify the selection of Ernst & Young LLP.


                 MANAGEMENT AND THE BOARD OF DIRECTORS RECOMMEND
                         A VOTE IN FAVOR OF PROPOSAL 3.


                                       11
<PAGE>
                            SECURITY OWNERSHIP OF
                   CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

   The following table sets forth certain information regarding the ownership of
the  Company's  Common  Stock as of March 14,  1997,  by: (i) each  director and
nominee for director;  (ii) each of the executive officers of the Company; (iii)
all  executive  officers and  directors of the Company as a group;  and (iv) all
those known by the Company to be beneficial  owners of more than five percent of
its Common Stock.

                                                   BENEFICIAL OWNERSHIP (1)
                                                  ------------------------
                                                    NUMBER OF   PERCENT OF
BENEFICIAL OWNER                                     SHARES       TOTAL
- ------------------------------------------------- ----------- ------------
Zeneca Limited .................................    2,580,016     19.8
 15 Stanhope Gate                                                 
 London W1Y 6LN                                                    
 England                                                           
International Biotechnology Trust plc ..........      711,667      5.5
 Five Arrows House                                                
 St. Swithin's Lane                                                
 London EC4N 8NR England                                           
Stephen Evans-Freke (2) ........................      718,469      5.4
 351 Galveston Drive                                              
 Redwood City, CA 94063                                            
Jeremy L. Curnock Cook (3) .....................      721,667      5.5
Anthony B. Evnin, Ph.D. (4) ....................       30,612       *
Charles M. Hartman (5) .........................      437,049      3.4
Heinrich Kuhn (6) ..............................       47,666       *
Donald E. Nickelson (7) ........................       45,999       *
Bruce R. Ross (8) ..............................       30,000       *
Richard D. Spizzirri (9) .......................      267,504      2.1
Axel Ullrich, Ph.D. (10) .......................      224,333      1.7
Glenn S. Utt, Jr. (11) .........................       52,000       *
Michael A. Wall (12) ...........................       60,721       *
Sara A. Courtneidge, Ph.D. (13) ................       45,000       *
Christine E. Gray-Smith (14) ...................       25,433       *
K. Peter Hirth, Ph.D. (15) .....................       94,471       *
Laura K. Shawver, Ph.D. (16) ...................       30,922       *
All executive officers and directors                              
  as a group (16 persons) (17) .................    3,064,179     22.5

- ---------------------                                                  
   * Less than one percent.

(1)  This table is based upon  information  supplied by officers,  directors and
     principal  stockholders and Schedules 13D and 13G filed with the Securities
     and  Exchange  Commission  ("SEC").   Unless  otherwise  indicated  in  the
     footnotes  to this  table and  subject  to  community  property  laws where
     applicable,  the Company  believes that each of the  stockholders  named in
     this table has sole voting and investment  power with respect to the shares
     indicated  as  beneficially  owned.  Applicable  percentages  are  based on
     13,039,822 shares of Common Stock  outstanding on March 14, 1997,  adjusted
     as required by rules promulgated by the SEC.

(2)  Includes (i) 5,333 shares  beneficially  owned by ITIM Corp.,  of which Mr.
     Evans-Freke is a stockholder and director,  (ii) 23,424 shares beneficially
     owned by Mr.  Evans-Freke  as co-trustee of his  children's  trusts,  (iii)
     8,271  shares  owned by his  spouse,  (iv)  64,812  shares of Common  Stock
     subject to  repurchase  in favor of the  Company,  and (v)  225,000  shares
     subject to stock options  exercisable  within 60 days of March 14, 1997, of
     which 185,063 are subject to a repurchase option in favor of the Company in
     the event of early exercise.

                                       12
<PAGE>

(3)  Includes 711,667 shares  beneficially  held by International  Biotechnology
     Trust  plc  ("IBT")  of  which  Mr.  Curnock  Cook  is  a  director  and  a
     shareholder.  Mr. Curnock Cook is a director of Rothschild Asset Management
     Limited,  the  discretionary  investment  advisor of IBT. Mr.  Curnock Cook
     disclaims  beneficial  ownership of the IBT shares  except to the extent of
     his shareholder  interest  therein.  Also includes 10,000 shares subject to
     stock options  exercisable  within 60 days of March 14, 1997,  all of which
     would be  subject  to a  repurchase  option in favor of the  Company in the
     event of early exercise.

(4)  Includes 12,000 shares subject to stock options  exercisable within 60 days
     of March 14, 1997.

(5)  Includes  306,666  shares  owned by CW R&D II  (Financial)  Fund,  L.P. and
     105,050  shares  owned by CW  Ventures  II, L.P.  Mr.  Hartman is a general
     partner of CW Partners II, L.P.  ("CWP II") and CW Partners III, L.P. ("CWP
     III"). CWP II is a general partner of CW R&D II (Financial)  Fund, L.P. CWP
     III is a general  partner of CW Ventures  II, L.P.  Mr.  Hartman  disclaims
     beneficial  ownership  of the shares  held by such  entities  except to the
     extent of his partnership  interests  therein.  Also includes 12,000 shares
     subject to stock options exercisable within 60 days of March 14, 1997.

(6)  Includes 22,000 shares subject to stock options  exercisable within 60 days
     of March 14,  1997,  of which 5,625 are subject to a  repurchase  option in
     favor of the Company in the event of an early exercise.

(7)  Includes 22,000 shares subject to stock options  exercisable within 60 days
     of March 14, 1997.

(8)  Includes 26,000 shares subject to stock options  exercisable within 60 days
     of March 14, 1997.

(9)  Includes 12,000 shares subject to stock options  exercisable within 60 days
     of March 14, 1997.

(10) Includes 32,333 shares subject to stock options  exercisable within 60 days
     of March 14,  1997,  of which 6,563 are subject to a  repurchase  option in
     favor of the Company in the event of an early exercise.

(11) Includes 12,000 shares subject to stock options  exercisable within 60 days
     of March 14, 1997.

(12) Includes  (i)  6,666  shares  registered  to Mr.  Wall  as  trustee  of his
     children's  trust account,  and (ii) 12,000 shares subject to stock options
     exercisable within 60 days of March 14, 1997.

(13) Includes 44,000 shares subject to stock options  exercisable within 60 days
     of March 14, 1997.

(14) Includes 23,933 shares subject to stock options  exercisable within 60 days
     of March 14, 1997.

(15) Includes 59,996 shares subject to stock options  exercisable within 60 days
     of March 14, 1997.

(16) Includes 18,817 shares subject to stock options  exercisable within 60 days
     of March 14, 1997.

(17) Includes  shares held by directors and  executive  officers of the Company,
     and entities  affiliated  with such persons.  Also  includes  64,812 shares
     subject to repurchase in favor of the Company and 576,412 shares subject to
     stock options held by executive  officers and directors  exercisable within
     60 days of March 14,  1997,  of which  213,814 are subject to a  repurchase
     option in favor of the Company in the event of early exercise;  see Notes 2
     through 16 above.

COMPLIANCE WITH SECTION 16(A) OF THE SECURITIES EXCHANGE ACT OF 1934

   Section 16(a) of the  Securities  Exchange Act of 1934 requires the Company's
directors and executive officers, and persons who own more than ten percent of a
registered  class  of the  Company's  equity  securities,  to file  with the SEC
initial reports of ownership and reports of changes in ownership of Common Stock
and other equity securities of the Company. Officers, directors and greater than
ten percent  stockholders  are required by SEC regulation to furnish the Company
with copies of all Section 16(a) forms they file.

   To the  Company's  knowledge,  based solely on a review of the copies of such
reports  furnished  to the  Company and  written  representations  that no other
reports were  required,  during the fiscal year ended  December  31,  1996,  all
Section 16(a) filing  requirements  applicable  to its  officers,  directors and
greater than ten percent beneficial owners were met.

                             EXECUTIVE COMPENSATION

COMPENSATION OF DIRECTORS

   Each of the  Company's  non-employee  directors  receives a fee of $1,000 for
each Board of Directors and Board committee meeting attended.  In the event that
a Board meeting and Board committee meeting are held on the same day,  directors
receive a fee for attending only one meeting. Non-employee directors

                                       13
<PAGE>

are also eligible for  reimbursement  of their  expenses  incurred in connection
with attendance at meetings,  in accordance  with Company policy.  Directors who
are  employees  of the Company do not receive  separate  compensation  for their
services as  directors,  but are  eligible to receive  stock  options  under the
Company's stock option plans. Each non-employee director of the Company receives
stock option grants under the 1994  Non-Employee  Directors'  Stock Option Plan.
Only non-employee directors of the Company are eligible to receive options under
the 1994 Non-Employee Directors' Stock Option Plan.

COMPENSATION OF EXECUTIVE OFFICERS

   The following table shows for the fiscal years ending December 31, 1996, 1995
and 1994  compensation  awarded or paid to, or earned by,  the  Company's  Chief
Executive Officer and its other four most highly compensated  executive officers
whose total  annual  salary and bonuses  exceeded  $100,000  for the fiscal year
ending December 31, 1996 (the "Named Executive Officers"):
<TABLE>

                          SUMMARY COMPENSATION TABLE
<CAPTION>
                                                                                     LONG-TERM COMPENSATION
                                               ANNUAL COMPENSATION                           AWARDS
                                ------------------------------------------------ ----------------------------
                                                                                   SECURITIES
                                                                    OTHER ANNUAL   UNDERLYING     ALL OTHER
                                          SALARY        BONUS       COMPENSATION    OPTIONS/     COMPENSATION
  NAME AND PRINCIPAL POSITION     YEAR      ($)          ($)            ($)         SARS (#)         ($)
- ------------------------------- ------ ----------- -------------- -------------- ------------- --------------
<S>                              <C>    <C>           <C>            <C>            <C>           <C>          
Stephen Evans-Freke ............ 1996   $290,000      $95,000        $    0          45,000       $      0
 Chief Executive Officer and     1995   $260,000      $84,000        $    0         180,000(1)    $      0
 Chairman of the Board           1994   $234,875      $50,000        $    0         132,333(2)    $     500(3)

James L. Tyree (4) ............. 1996   $294,248      $     0        $    0               0       $ 244,624
 Former President and Director   1995   $260,000      $76,000        $    0         120,000(5)    $       0
                                 1994   $151,667      $30,000        $5,952         196,665(6)    $  19,839

K. Peter Hirth, Ph.D. .......... 1996   $197,743      $50,000        $    0          35,000       $  50,000(7)
 Executive Vice President and    1995   $161,599      $33,735        $    0          73,200       $       0
 Chairman of the Research and    1994   $150,000      $13,000        $    0          25,000(8)    $     500(3)
 Development Committee                                

Sara A. Courtneidge, Ph.D. (9).. 1996   $147,700      $26,586        $    0          20,000       $       0
 Senior Vice President,          1995   $143,458      $21,000        $  925          25,000       $   3,085
 Research                        1994   $ 13,282      $32,000 (10)   $1,463          50,000(11)   $   4,876

Christine E. Gray-Smith (12)  .. 1996   $112,500      $12,656        $    0           9,000       $       0
 Vice President, Finance         1995   $104,967      $13,797        $    0          10,000       $       0
                                 1994   $ 39,808      $     0        $    0          31,333(13)   $       0
<FN>

(1)  Includes  options to  purchase  45,000  shares of Common  Stock  granted in
     January 1996 for prior year's performance.

(2)  Includes  options to  purchase  94,000  shares of Common  Stock  granted in
     February 1995 for prior year's performance.

(3)  Consists of a discretionary  contribution to the Company's 401(k) Plan made
     by the Company on behalf of Mr. Evans-Freke and Dr. Hirth.

(4)  Mr. Tyree  terminated his employment  with and service as a director of the
     Company  on June 6,  1996 and  continues  to  receive  salary  continuation
     benefits.  Mr. Tyree's "Other Compensation" of $244,624 in 1996 consists of
     the forgiveness of loans.  Mr. Tyree commenced  employment with the Company
     on June 1,  1994 at an  annual  salary  of  $260,000.  Mr.  Tyree's  "Other
     Compensation"  of  $19,839  in  1994  consists  of  reimbursement  for  his
     relocation expenses,  and the "Other Annual Compensation" of $5,952 in 1994
     consists of a tax gross-up on that relocation amount. Pursuant to the terms
     of Mr.  Tyree's  separation  agreement  with the Company,  a portion of Mr.
     Tyree's  stock  option  grants  continue  to vest  through  June  6,  1997,
     resulting  in the  cancelation  of options to  purchase  195,833  shares of
     Common  Stock of the options to  purchase  316,665  shares of Common  Stock
     granted.

(5)  Includes  options to  purchase  30,000  shares of Common  Stock  granted in
     January 1996 for prior year's performance.

                                       14
<PAGE>

(6)  Includes  options to  purchase  50,000  shares of Common  Stock  granted in
     February 1995 for prior year's performance.

(7)  Dr. Hirth's "Other  Compensation" of $50,000 consists of the forgiveness of
     a loan for the purchase of a residence.

(8)  Represents  an option to purchase  25,000 shares of Common Stock granted to
     Dr. Hirth in February 1995 for prior year's performance.

(9)  Dr. Courtneidge  commenced employment with the Company on November 28, 1994
     at an annual salary of $140,000.  Dr. Courtneidge's "Other Compensation" of
     $3,085  and  $4,876  during  1995  and  1994,  respectively,   consists  of
     reimbursement for relocation  expenses.  The "Other Annual Compensation" of
     $925 and  $1,463  during  1995 and 1994,  respectively,  consists  of a tax
     gross-up on those respective relocation amounts.

(10) Represents a sign-on bonus.

(11) Includes  options to  purchase  10,000  shares of Common  Stock  granted in
     February 1995 for prior year's performance.

(12) Ms. Gray-Smith  commenced  employment with the Company on August 8, 1994 at
     an annual salary of $100,000.

(13) Includes  options to  purchase  10,000  shares of Common  Stock  granted in
     February 1995 for prior year's performance.
</FN>
</TABLE>

                        STOCK OPTION GRANTS AND EXERCISES

   The Company  grants  options to its executive  officers  under its 1992 Stock
Option Plan and Long- Term  Objectives  Stock Option Plan for Senior  Management
(the "Employee Plans").  As of December 31, 1996, options to purchase a total of
1,769,863  shares (net of canceled or expired options) had been granted and were
outstanding   under  the  Employee  Plans,  of  which  151,847  are  subject  to
stockholder approval.

   The following tables show for the fiscal year ended December 31, 1996 certain
information  regarding options granted to, exercised by, and held at year end by
the Named Executive Officers: 
<TABLE>

                      OPTION GRANTS IN FISCAL YEAR 1996
<CAPTION>
                                                                                   POTENTIAL REALIZABLE
                                                                                     VALUE AT ASSUMED
                                                                                     ANNUAL RATES OF
                                                                                       STOCK PRICE
                                                                                     APPRECIATION FOR
                                                 INDIVIDUAL GRANTS                    OPTION TERM (2)
                                ------------------------------------------------- ---------------------
                                             % OF TOTAL
                                 NUMBER OF     OPTIONS
                                 SECURITIES   GRANTED TO
                                 UNDERLYING   EMPLOYEES    EXERCISE
                                  OPTIONS     IN FISCAL     PRICE     EXPIRATION
              NAME               GRANTED (#)   YEAR (1)     ($/SH)       DATE       5% ($)    10% ($)
- ------------------------------- ------------ ------------ ---------- ------------ ---------- ----------

<S>                                <C>          <C>          <C>        <C>         <C>        <C>     
STEPHEN EVANS-FREKE (3) ........   45,000       8.88         $11.75      1/17/06    $332,528   $842,691
                                   45,000       8.88          11.38     12/17/06     321,915    815,796
JAMES L. TYREE (4) .............   30,000       5.92          11.75      1/17/06     221,685    561,795
K. PETER HIRTH, PH.D. (5)  .....   35,000       6.90          11.38     12/17/06     250,379    634,509
SARA A. COURTNEIDGE, PH.D. (6)     20,000       3.95          11.38     12/17/06     143,074    362,576
CHRISTINE E. GRAY-SMITH (7)  ...    9,000       1.78          11.38     12/17/06      64,383    163,159
                                   
<FN>
(1)  Based on an aggregate of 506,966  options  granted under the Employee Plans
     in fiscal year 1996 to employees.

(2)  The  potential  realizable  value is based on the term of the option at the
     time of grant (10 years). It is calculated by assuming that the stock price
     on the date of grant  appreciates at the indicated annual rate,  compounded
     annually  for the  entire  term of the  option,  and  that  the  option  is
     exercised and sold on the last day of its term at the appreciated price. No
     gain to the optionee is possible  unless the stock price increases over the
     option term, which will benefit all stockholders.

(3)  Each option to purchase 45,000 shares of Common Stock vests over four years
     at the rate of  one-sixteenth  of the  shares  subject  to the  option  per
     quarter  beginning  April 1, 1996 for the January 1996 grant and January 1,
     1997 for the December 1996 grant.

(4)  Options  to  purchase  30,000  shares of Common  Stock  vest at the rate of
     one-sixteenth  of the shares  subject to the option per  quarter  beginning
     April 1, 1996 through June 6, 1997. The unvested portion has been canceled.

                                       15
<PAGE>
(5)  Options to purchase  35,000  shares of Common Stock vest over four years at
     the rate of  one-sixteenth  of the shares subject to the option per quarter
     beginning January 1, 1997.

(6)  Options to purchase  20,000  shares of Common Stock vest over four years at
     the rate of  one-sixteenth  of the shares subject to the option per quarter
     beginning January 1, 1997.

(7)  Options to purchase  9,000  shares of Common  Stock vest over four years at
     the rate of  one-sixteenth  of the shares subject to the option per quarter
     beginning January 1, 1997.
</FN>
</TABLE>
<TABLE>

                 AGGREGATED OPTION EXERCISES IN LAST FISCAL YEAR
                        AND FISCAL YEAR-END OPTION VALUES
<CAPTION>
                                                         
                                                                                 VALUE OF    
                                                         NUMBER OF SECURITIES   UNEXERCISED  
                                                             UNDERLYING        IN-THE-MONEY  
                                                         UNEXERCISED OPTIONS    OPTIONS AT   
                               SHARES        VALUE          AT FY-END (#)      FY-END ($)(2) 
                             ACQUIRED ON    REALIZED        EXERCISABLE/       EXERCISABLE/  
            NAME             EXERCISE (#)     ($)(1)       UNEXERCISABLE      UNEXERCISABLE
- --------------------------- ------------- ------------- -------------------- ---------------
<S>                         <C>           <C>           <C>                  <C>
Stephen Evans-Freke ........132,333       $703,623           225,000/0       $      759,375/0
James L. Tyree ............. 33,971        216,686       63,527/19,334        392,100/107,843
K. Peter Hirth, Ph.D.  .....  3,266         33,318      44,471/119,130        400,853/397,747
Sara A. Courtneidge, Ph.D.      -0-            -0-       33,125/61,875        191,680/213,945
Christine E. Gray-Smith  ...    500          2,750       17,641/31,459        105,383/124,429
<FN>

(1)  Value realized is based on the fair market value of the Common Stock on the
     date of exercise minus the exercise price and does not necessarily indicate
     that the optionee sold such stock.

(2)  Based on the fair market  value of the Common  Stock at  December  31, 1996
     ($12.88), minus the exercise price of the option.
</FN>
</TABLE>


REPORT OF THE COMPENSATION COMMITTEE OF THE BOARD OF DIRECTORS ON EXECUTIVE
COMPENSATION(i)

   The  Company's  executive   compensation   program  is  administered  by  the
Compensation  Committee  composed  of Anthony B.  Evnin,  Glenn S. Utt,  Jr. and
Michael A. Wall (Chairman), each a non-employee director of the Company.

   The Company's executive compensation program is designed to retain,  motivate
and reward  executives who are  responsible for leading the Company in achieving
its business objectives. All decisions by the Compensation Committee relating to
the  compensation of the Company's  executive  officers are reviewed by the full
Board. This report is submitted by the Compensation  Committee and addresses the
Company's  compensation  policies for the fiscal year ended December 31, 1996 as
they affected Stephen Evans-Freke,  in his capacity as Chairman of the Board and
Chief Executive Officer of the Company,  and the other executive officers of the
Company.

COMPENSATION PHILOSOPHY

   The  objectives  of the  executive  compensation  program  are  to (i)  align
compensation with the Company's business objectives and individual  performance,
(ii) motivate and reward high levels of performance,  (iii) recognize and reward
the  achievement  of team and  individual  goals and (iv)  enable the Company to
attract,  retain and reward  executive  officers who contribute to the long-term
success of the Company.

   The  Company's  executive  compensation  philosophy  is to tie a  significant
portion of executive compensation to the performance of the Company and is based
on the following:

- ------------------

(i)  The  material in this report is not  "soliciting  material,"  is not deemed
     filed with the SEC and is not to be incorporated by reference in any filing
     of  the  Company  under  the  Securities  Act  of  1933,  as  amended  (the
     "Securities Act"), or the Securities  Exchange Act of 1934, as amended (the
     "Exchange  Act"),  whether  made  before  or  after  the  date  hereof  and
     irrespective  of any  general  incorporation  language  contained  in  such
     filing.

                                       16
<PAGE>

               - The Committee  regularly  compares its  executive  compensation
               practices with those of other  companies in the industry and sets
               its compensation  guidelines based on this review.  The Company's
               base annual  salaries  for its  executives  are  generally in the
               mid-range of those paid to executives of comparable  companies in
               the biopharmaceutical industry. The Compensation Committee seeks,
               however,  to provide its executives with opportunities for higher
               compensation through cash bonuses and stock options.

               - The Committee  believes that, in order to further  motivate its
               executives, a very substantial portion of the compensation of the
               Company's   executives   should  be   linked  to  the   Company's
               performance,  including that of its stock in the marketplace. The
               linkage is achieved  through the Company's  stock option program,
               which  includes the  Company's  1992 Stock Option Plan (the "1992
               Plan") and  Long-Term  Objectives  Stock  Option  Plan for Senior
               Management  (the "LTO  Plan").  This  program also serves to more
               fully  align  the  interests  of  management  with  those  of the
               Company's stockholders.

               - The  Committee  also  believes  that an executive  compensation
               program   that  ties  cash  bonus  awards  to   performance   and
               achievement  of the  Company's  stated  goals  serves  both as an
               influential  motivator  to its  executives  and  as an  effective
               instrument  for  aligning  their  interests  with  those  of  the
               stockholders of the Company.

IMPLEMENTATION OF COMPENSATION PROGRAM

   Annual compensation for the Company's  executives consists of three principal
elements: salary, cash bonuses and stock options. 

 Salary

   The  Compensation  Committee  sets the base annual  salary for  executives by
reviewing compensation for comparable positions in the market and the historical
compensation  levels of the  Company's  executives.  Currently,  the base annual
salaries  of the  Company's  executives  are at levels  which  the  Compensation
Committee  believes are  generally in the  mid-range of  executives of companies
with which the Company compares  itself.  Increases in annual salaries are based
on a review and  evaluation  of  executive  salary  levels and the  demonstrated
capabilities   of  the   executives   in   managing   the  key   aspects   of  a
biopharmaceutical  company,  including,  generally in order of  importance,  (i)
research,  drug  discovery  and  preclinical  and  clinical  development,   (ii)
strategic  planning,   including  corporate  partnering,   patent  strategy  and
scientific collaborations, (iii) financial matters, including attracting capital
and financial planning and (iv) human resources. 

 Cash Bonuses

   In December 1995, the Compensation  Committee adopted the 1996 Key Management
Cash Incentive  Compensation  Plan (the "1996 CIP").  The objectives of the 1996
CIP were consistent with the Company's compensation  philosophy set forth above.
The  objectives  of the 1996 CIP were to  motivate  and reward  key  management,
including  officers of the Company,  for  achievement of  significant  operating
objectives  and to retain key  management  by remaining  competitive  with other
biotechnology companies. The structure of the 1996 CIP was that two-thirds of an
officer's  cash bonus was directly  related to achievement of specific goals and
the  remaining  one-third was  discretionary.  The goals for the officers of the
Company  are  established  annually  by the Board of  Directors  or a  Committee
designated by the Board.  Individual  bonuses of 15% or more of a  participant's
annual base salary are approved by the Compensation Committee.

   Pursuant to the 1996 CIP, each of the Named Executive  Officers (except James
L. Tyree, who resigned from his positions with the Company  effective June 1996)
received a cash  performance  bonus for fiscal 1996.  Cash bonuses were based on
the achievement of the specific operating objectives established for the Company
during 1996,  combined with a subjective  assessment of individual  performance.
The goals included the  achievement of objectives  with respect to the filing of
an Investigational  New Drug application,  advancement of the Company's research
and development  activities,  including the advancement of clinical  activities,
the completion of the Company's collaboration with Allergan, Inc. and the

                                       17
<PAGE>

completion of the Company's  public offering of Common Stock in October 1996, as
well as the attainment of other goals  established  for the year for the Company
and for  individual  executive  officers.  Pursuant  to the 1996 CIP,  the Named
Executive  Officers (except Mr. Tyree) each received a cash bonus ranging from a
high  of  approximately  33% to a low  of  approximately  11%  of the  executive
officer's annual base salary.  All executive  officers of the Company as a group
received  aggregate bonus awards of $201,785 for fiscal 1996 performance,  which
also  represented  a range of 11% to 33% of the executive  officers'  respective
base salaries.

  Stock Options 

   Total compensation at the executive level also includes long-term  incentives
offered by stock options.  Stock options are designed to promote the identity of
long-term  interests between the Company's employees and its stockholders and to
assist in the retention of employees.  In the case of stock options, the size of
individual  option  grants is  generally  intended  to reflect  the  executive's
position with the Company and his or her  importance  and  contributions  to the
Company. Options have been granted to executives under the 1992 Plan and the LTO
Plan.  The  option  program  generally  requires a vesting  period to  encourage
employees to continue in the employ of the Company.

   In December 1996, the Compensation  Committee awarded performance based stock
option grants under the 1992 Plan to all of the Company's executive officers for
1996  performance.  Options granted under the 1992 Plan generally vest quarterly
over four years from the date of the grant.  It has been the Company's  practice
to fix the  exercise  price of option  grants under the 1992 Plan at 100% of the
fair market  value per share on the date of grant.  The  Compensation  Committee
considered the number of options held by executive  officers when awarding stock
option grants under the 1992 Plan.

   No options were granted under the LTO Plan in 1996.  The LTO Plan was adopted
in 1995  to  provide  a means  to  enable  the  Company  to  create  significant
incentives for senior  executive  management  employees to exert maximum efforts
for the success of the Company  through the award of options to purchase  shares
of Common Stock,  which become  exercisable over an extended  vesting  schedule,
subject to  acceleration  upon the  achievement  of certain  specific  long-term
objectives  important to the Company's success. See "--Compensation of the Chief
Executive Officer in Fiscal 1996" below.

LIMITATION ON DEDUCTION OF COMPENSATION PAID TO CERTAIN NAMED EXECUTIVE OFFICERS

   Section  162(m) of the Internal  Revenue Code (the "Code") limits the Company
to a deduction  for federal  income tax purposes of no more than  $1,000,000  of
compensation paid to certain executive officers in a taxable year.  Compensation
above  $1,000,000  may be  deducted  if it is  "performance-based  compensation"
within the meaning of the Code.

   The  Compensation  Committee has determined  that stock options granted under
the 1992 Plan with an exercise  price at least equal to the fair market value of
the Common  Stock on the date of grant  shall be  treated as  "performance-based
compensation."  The  Compensation  Committee has  determined  that  compensation
attributable to stock options granted under the LTO Plan shall be counted toward
the  $1,000,000   limitation  and,  to  the  extent  such  compensation  exceeds
$1,000,000  when  combined  with all other types of  compensation  received by a
covered  employee from the Company,  may not be deductible as a business expense
by the Company. 

COMPENSATION OF THE CHIEF EXECUTIVE OFFICER IN FISCAL 1996

   As discussed  above,  Mr.  Evans-Freke is eligible to participate in the same
executive  compensation  plans available to the other executive  officers of the
Company,   including   the  1996  CIP.  The   Compensation   Committee  set  Mr.
Evans-Freke's total annual compensation, including compensation derived from the
1996 CIP and stock option  program,  at a level it believes is competitive  with
that of other Chief Executive  Officers at other companies in the  biotechnology
industry,  although at the middle of the range. In addition,  Mr.  Evans-Freke's
performance-based  options  are  at a  level  and  subject  to  terms  that  the
Compensation   Committee   believes  will  properly   motivate  and  retain  Mr.
Evans-Freke as the Chief Executive Officer of the Company.

   Mr.  Evans-Freke  earned  $290,000  in 1996 as his  annual  base  salary.  In
determining  Mr.  Evans-Freke's  salary  for 1996,  the  Compensation  Committee
reviewed various factors. Some of these factors were Mr.

                                       18
<PAGE>

Evans-Freke's  contributions  for the prior year,  including the  advancement of
research  and  development  activities,   which  includes  corporate  partnering
transactions,  the  filing  of an  Investigational  New  Drug  application,  the
successful  offering  of  Common  Stock,  as well as Mr.  Evans-Freke's  overall
success in managing and  motivating the Company's  employees,  together with the
challenges to be faced in 1996 and the desire to offer a competitive salary. His
bonus  award  of  $95,000  for  fiscal  1996  performance  reflects  substantial
attainment  of  the  Company's  goals  for  1996,  as  set  forth  above  and as
established by the Board of Directors.

   In August 1996, the Compensation  Committee amended certain outstanding stock
options  granted to Mr.  Evans-Freke  under the Company's  1992 Plan in order to
provide for payment of the  exercise  price of such options by  promissory  note
secured by a pledge of the Common Stock purchased upon exercise of such options.
Pursuant to the amended terms of the options, Mr. Evans-Freke  exercised options
to acquire  132,333 shares of Common Stock granted under the 1992 Plan, of which
62,938  shares  are  subject  to   repurchase  in  favor  of  the  Company.   In
consideration  for the  purchase of these  shares and the related tax  liability
upon the  exercise  of certain of the  options,  Mr.  Evans-Freke  issued a full
recourse  promissory  note in the  amount  of  approximately  $1.1  million.  In
December  1996, the  Compensation  Committee  granted Mr.  Evans-Freke an option
under the 1992 Plan to purchase  45,000 shares of Common Stock in recognition of
Mr. Evans-Freke's substantial contributions to the Company in 1996.

   In August 1996, in  consultation  with the  Company's  Audit  Committee,  the
Compensation  Committee determined that the financial reporting  implications of
the uncertain time period for vesting of the options  granted under the LTO Plan
in 1995 were not in the best interests of the Company. Accordingly, the terms of
an option to purchase 135,000 shares of Common Stock granted to Mr.  Evans-Freke
under the LTO Plan in 1995 were  amended  to  provide  for  time-based  vesting,
subject to  acceleration  by the  Compensation  Committee  upon  achievement  of
certain objectives. As amended, the option under the LTO Plan vests at a rate of
5% per calendar  quarter  commencing  on the first  calendar  quarter  after the
anniversary of the grant date (i.e. on October 1, 1996), subject to earlier full
or  partial  vesting  after  December  31,  1997  upon   determination   by  the
Compensation  Committee that all or a portion of the performance goals stated in
the option  have been  satisfied.  The terms of an option  granted to Dr.  Peter
Hirth under the LTO Plan (the only other outstanding  option under the LTO Plan)
were similarly amended. The terms of Mr. Evans-Freke's option under the LTO Plan
were also  amended to provide Mr.  Evans-Freke  with the right to  exercise  the
option prior to vesting (subject to a repurchase right in favor of the Company).
The  Compensation  Committee  believes  that the  amended  terms of the  options
continue to provide the desired management incentives. 

   The  Compensation  Committee  determined that the level of options granted to
Mr.  Evans-Freke  under the 1992 Plan was  commensurate  with Mr.  Evans-Freke's
substantial  contributions  on behalf of the Company  during 1996,  as set forth
above, and that the level of options  previously  granted under the LTO Plan and
the terms of such  options  are  consistent  with the  Company's  objectives  of
motivating  and rewarding  senior  executive  officers.  

                                        COMPENSATION  COMMITTEE

                                             Anthony B. Evnin 
                                             Glenn S. Utt, Jr. 
                                             Michael A. Wall, Chairman

                                       19
<PAGE>

PERFORMANCE MEASUREMENT COMPARISON

   The following  chart shows the total  stockholder  return of an investment of
$100 on  October  4, 1994 in cash of (i) Common  Stock,  (ii) the  Nasdaq  Stock
Market (U.S.) Index  ("Nasdaq")  and (iii) the  Hambrecht & Quist  Biotechnology
Index  ("H&Q").  All  values  assume  reinvestment  of the  full  amount  of all
dividends and compound on a monthly basis:

        COMPARISON OF 9 QUARTER CUMULATIVE TOTAL RETURN ON INVESTMENT

                                 SUGEN, INC.
                        H&Q BIOTECHNOLOGY SECTOR INDEX
                        NASDAQ STOCK MARKET-U.S. INDEX
<TABLE>

   [The following descriptive data is supplied in accordance with Rule 304(d) of
Regulation S-T]

<CAPTION>
                     10/4/94   Dec-94  Mar-95   Jun-95   Sep-95  Dec-95   Mar-95   Jun-96   Sep-96   Dec-96
                     -------   ------  ------   ------   ------  ------   ------   ------   ------   ------
<S>                    <C>      <C>     <C>      <C>     <C>     <C>      <C>      <C>      <C>      <C>   
Sugen, Inc.            100      68.33   90.00    91.67   185.00  198.33   190.00   156.67   158.33   171.67

Nasdaq Stock 
 Market U.S.           100     101.13  110.24   126.10   141.29  143.01   149.69   161.91   167.67    175.91

H&Q Biotechnology
 Sector                100     100.74  104.62   117.68   142.21  171.36   163.78   153.05   162.59    158.11

</TABLE>

- ----------------------

   This Section is not  "soliciting  material," is not deemed filed with the SEC
and is not to be  incorporated  by reference in any filing of the Company  under
the  Securities  Act or the Exchange Act,  whether made before or after the date
hereof and irrespective of any general  incorporation  language contained in any
such filing. 

   The  performance  of  the  Company's  stock  over  the  period  shown  is not
necessarily indicative of future performance.  October 4, 1994 was the effective
date of the Company's initial public offering.

                                       20
<PAGE>

                              CERTAIN TRANSACTIONS

   The Company paid $100,000 to each of Axel Ullrich,  Ph.D.,  a director of the
Company,  and Joseph  Schlessinger,  Ph.D.,  an honorary  member of the Board of
Directors of the Company, for consulting services rendered to the Company in the
last fiscal year, pursuant to consulting agreements entered into in August 1991.

   In May  1996,  the  Company  invested  $100,000  in  SUVA  Offshore  for  the
development of a  biopharamaceutical  company in the People's Republic of China.
These funds are intended to be used for pilot studies, market research analysis,
legal fees and other  expenses  associated  with the  formation of a cooperative
joint venture to create an indigenous biopharmaceutical company.

   In August 1996, Stephen Evans-Freke,  Chairman and Chief Executive Officer of
the Company,  exercised  options to purchase  132,333 shares of Common Stock, of
which 62,938 shares are subject to repurchase by the Company.  As  consideration
for the purchase of these shares and the related tax liability upon the exercise
of certain of these options,  Mr. Evans-Freke issued a full recourse  promissory
note in the amount of $1.1 million to the Company.

   In August 1994, in connection  with Mr. Tyree's  relocation to California and
commencement of employment as the President of the Company, the Company provided
a secured  loan of $175,000 to Mr.  Tyree to assist in the down  payment for the
purchase of a personal  residence  and a secured  loan of up to $3,000 per month
for  mortgage  payments,  all of which would be  forgivable.  In  addition,  the
Company had agreed that it would pay Mr. Tyree an amount equal to the  aggregate
of  such  monthly  payments  when  the  loans  were  forgiven,  as an  estimated
reimbursement for income tax liabilities  associated with such  forgiveness.  In
connection with Mr. Tyree's Separation  Agreement dated June 6, 1996, a $244,624
payment was made representing the forgiveness of a portion of the aforementioned
loans and payment of the related income tax liability. 

   The  Company  has  entered  into  indemnity  agreements  with  certain of its
officers and directors which provide,  among other things, that the Company will
indemnify such officer or director,  under the  circumstances  and to the extent
provided for therein, for expenses, damages, judgments, fines and settlements he
or she may be  required to pay in actions or  proceedings  which he or she is or
may be made a party by reason of such person's  position as a director,  officer
or other agent of the Company,  and otherwise to the full extent permitted under
Delaware law and the Company's Bylaws.

                                  OTHER MATTERS

   The Board of Directors  knows of no other  matters that will be presented for
consideration  at the Annual Meeting.  If any other matters are properly brought
before the meeting, it is the intention of the persons named in the accompanying
proxy to vote on such matters in accordance  with their best judgment.  


                                   By Order of the Board of Directors 



                                   Richard D. Spizzirri 
                                   Secretary 


April 9, 1997

   A copy of the Company's  Annual Report on Form 10-K for the fiscal year ended
December 31, 1996 is available  without charge upon written request to: Investor
Relations, SUGEN, Inc., 351 Galveston Drive, Redwood City, CA 94063.

                                       21
<PAGE>
                                                                      APPENDIX A

P
R                                 SUGEN, Inc.
O                  PROXY SOLICITED BY THE BOARD OF DIRECTORS
X                    FOR THE ANNUAL MEETING OF STOCKHOLDERS
Y                          TO BE HELD ON MAY 21, 1997

   The   undersigned  hereby  appoints  STEPHEN  EVANS-FREKE  and  CHRISTINE  E.
GRAY-SMITH, and each of them, as attorneys and proxies of the undersigned,  with
full power of  substitution,  to vote all of the shares of stock of SUGEN,  Inc.
which  the  undersigned  may be  entitled  to  vote  at the  Annual  Meeting  of
Stockholders of SUGEN, Inc. to be held at the offices of the Company, located at
351 Galveston Drive,  Redwood City,  California,  on Wednesday, May 21, 1997, at
10:00 a.m.,  (local time), and at any and all  postponements,  continuations and
adjournments  thereof,  with all powers that the  undersigned  would  possess if
personally  present,  upon  and in  respect  of  the  following  matters  and in
accordance with the following  instructions,  with discretionary authority as to
any and all other matters that may properly come before the meeting.

   UNLESS A CONTRARY  DIRECTION IS  INDICATED,  THIS PROXY WILL BE VOTED FOR ALL
NOMINEES  LISTED IN PROPOSAL 1 AND FOR  PROPOSALS 2 AND 3, AS MORE  SPECIFICALLY
DESCRIBED IN THE PROXY STATEMENT.  IF SPECIFIC INSTRUCTIONS ARE INDICATED,  THIS
PROXY WILL BE VOTED IN ACCORDANCE THEREWITH.

                   CONTINUED AND TO BE SIGNED ON REVERSE SIDE
                                                                     -----------
                                                                     SEE REVERSE
                                                                        SIDE
                                                                     -----------
<PAGE>
<TABLE>

[ X ] Please mark 
      votes as in 
      this example.
<CAPTION>

MANAGEMENT AND THE BOARD OF DIRECTORS RECOMMEND A VOTE FOR THE NOMINEES FOR DIRECTOR LISTED BELOW AND A VOTE FOR PROPOSALS 2 AND 3.
<S>                                                                      <C>   

1. To elect four directors to hold office until the 2000 Annual Meeting                                     FOR   AGAINST   ABSTAIN
   of Stockholders.                                                      2. To approve an amendment to the  [  ]    [  ]      [  ]
Nominees: Charles M. Hartman, Donald E. Nickelson,                          Company's 1992 Stock Option Plan
          Bruce R. Ross, Richard D. Spizzirri                               as amended, to increase the number
                FOR        WITHHELD                                         of shares of Common Stock available
                [  ]         [  ]                                           for issuance under the Plan by
                                                                            650,000 shares.

                                                                                                             FOR   AGAINST   ABSTAIN
                                                                         3. To ratify the selection of Ernst [  ]    [  ]      [  ]
[  ]__________________________________________                              & Young LLP as independent auditors
     For all nominees except as noted above                                 of the Company for its fiscal year
                                                                            ending December 31, 1997.

                                                                         4. To transact such other business as may properly come
                                                                            before the meeting or any adjournment or postponement 
                                                                            thereof.

                                                                                                                MARK HERE   [  ]
                                                                                                               FOR ADDRESS
                                                                                                                CHANGE AND
                                                                                                               NOTE AT LEFT

                                                                         Please  vote,  date and  promptly  return this proxy in the
                                                                         enclosed return envelope which is postage prepaid if mailed
                                                                         in the United States.

                                                                         Please sign  exactly as your name  appears  hereon.  If the
                                                                         stock is  registered in the  names of two or more  persons,
                                                                         each  should  sign.  Executors,  administrators,  trustees,
                                                                         guardians and attorneys-in-fact should add their titles. If
                                                                         signer is a  corporation,  please give full  corporate name
                                                                         and have a duly authorized  officer sign, stating title. If
                                                                         signer is a partnership, please sign in partnership name by
                                                                         authorized person.
</TABLE>



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