TREGA BIOSCIENCES INC
DEF 14A, 1998-07-15
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                            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
|                                                     
|X| Definitive Proxy Statement
|_| Definitive Additional Materials
|_| Soliciting Material Pursuant to Rule 14a-11(c) or Rule 14a-12

                            TREGA BIOSCIENCES, INC.
________________________________________________________________________________
                (Name of Registrant as Specified In Its Charter)

________________________________________________________________________________
                   (Name of Person(s) Filing Proxy Statement)

Payment of Filing Fee (Check the appropriate box):

|X| No fee required.
|_| $125 per Exchange Act Rule 0-11(c)(1)(ii), 14a-6(i)(1) or 14a-6(j)(2).
|_| $500 per each party to the controversy pursuant to
    Exchange Act Rule 14a-6(i)(3).
|_| 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 transaction applies:

   _____________________________________________________________________________

2) Aggregate number of securities to which transaction applies:

   _____________________________________________________________________________

3) Per unit price or other underlying value of transaction computed
   pursuant to Exchange Act Rule 0-11:*

   _____________________________________________________________________________

4) Proposed maximum aggregate value of transaction:

   _____________________________________________________________________________

|_| 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 No. ______________________________________

    3) Filing party: ___________________________________________________________

    4) Date filed: _____________________________________________________________

___________
*Set forth the amount on which the filing fee is calculated and state how it was
 determined.

(032796DTI)

<PAGE>

                                [GRAPHIC OMITTED]
                                     [LOGO]

                             9880 Campus Point Drive
                           San Diego, California 92121
                                 (619) 410-6500




                                                                   July 15, 1998




Dear Stockholder:

     You are cordially  invited to attend the Annual Meeting of  Stockholders of
Trega Biosciences,  Inc. which will be held on Tuesday, August 25, 1998, at 9:00
a.m.,  Pacific  Daylight  Time,  at the Company's  headquarters  located at 9880
Campus Point Drive, San Diego, California.

     The formal notice of the Annual  Meeting and the Proxy  Statement have been
made a part of this invitation.

     After reading the Proxy Statement,  please mark, date, sign and return,  at
your earliest  convenience,  the enclosed proxy in the enclosed prepaid envelope
to ensure  that your  shares will be  represented.  YOUR SHARES  CANNOT BE VOTED
UNLESS YOU SIGN, DATE AND RETURN THE ENCLOSED PROXY OR ATTEND THE ANNUAL MEETING
IN PERSON.

     A copy of the 1997 Annual Report to Stockholders is also enclosed.

     The Board of  Directors  and  management  look forward to seeing you at the
meeting.




                                            Sincerely yours,
                                            /s/ Robert S. Whitehead

                                            Robert S. Whitehead
                                            Chairman and Chief Executive Officer




<PAGE>

                             TREGA BIOSCIENCES, INC.

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

                    Notice of Annual Meeting of Stockholders
                           to be held August 25, 1998

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

To the Stockholders of Trega Biosciences, Inc.:

     The Annual Meeting of Stockholders of Trega  Biosciences,  Inc., a Delaware
corporation (the "Company"),  will be held at the Company's headquarters located
at 9880 Campus Point Drive, San Diego, California,  on Tuesday, August 25, 1998,
at 9:00 a.m., Pacific Daylight Time, for the following purposes:

     1.   To elect two Directors (two Class I Directors);


     2.   To consider  and vote upon a proposal to increase the number of shares
          of the  Company's  Common  Stock  available  for  issuance  under  the
          Company's 1996 Stock  Incentive Plan (from 2,960,465 to 4,960,465) and
          to approve such plan as amended and restated;


     3.   To consider  and vote upon a proposal to increase the number of shares
          of the  Company's  Common  Stock  available  for  issuance  under  the
          Company's 1996 Employee Stock Purchase Plan (from 100,000 to 250,000);

     4.   To  ratify  the  appointment  of  Ernst & Young  LLP as the  Company's
          independent auditors; and

     5.   To transact such other business as may properly come before the Annual
          Meeting and any adjournment or postponement thereof.

     Stockholders  of record as of the close of business on June 29,  1998,  are
entitled to notice of and to vote at the Annual  Meeting and any  adjournment or
postponement  thereof.  A complete list of stockholders  entitled to vote at the
Annual  Meeting will be available  for the ten days  immediately  preceding  the
Annual Meeting at the Office of the Secretary,  Trega  Biosciences,  Inc.,  9880
Campus Point Drive, San Diego, California 92121.

     IT IS IMPORTANT  THAT YOUR SHARES ARE  REPRESENTED  AT THE ANNUAL  MEETING.
EVEN IF YOU PLAN TO ATTEND THE ANNUAL  MEETING,  WE HOPE THAT YOU WILL  PROMPTLY
MARK,  SIGN, DATE AND RETURN THE ENCLOSED PROXY.  THIS WILL NOT LIMIT YOUR RIGHT
TO ATTEND OR VOTE AT THE ANNUAL MEETING.


                                        By Order of the Board of Directors,


                                        /s/ Noel M. Wheeler


                                        Noel M. Wheeler
                                        Secretary



July 15, 1998


<PAGE>

                             TREGA BIOSCIENCES, INC.
                             9880 Campus Point Drive
                           San Diego, California 92121

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

                                 PROXY STATEMENT

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

     This Proxy  Statement is furnished in connection  with the  solicitation by
the Board of Directors of Trega Biosciences,  Inc., a Delaware  corporation (the
"Company"), of proxies in the accompanying form to be used at the Annual Meeting
of Stockholders of the Company to be held at the Company's  headquarters located
at 9880 Campus Point Drive, San Diego, California,  on Tuesday, August 25, 1998,
at 9:00 a.m., Pacific Daylight Time, and any adjournment or postponement thereof
(the "Annual Meeting").


     Shares represented by proxies received in response to this solicitation and
not revoked will be voted at the Annual  Meeting.  A stockholder who has given a
proxy  may  revoke  it at any time  before it is  exercised  by filing  with the
Secretary of the Company a written revocation or a duly executed proxy bearing a
later date or by voting in person at the Annual Meeting; however,  attendance at
the Annual Meeting will not in and of itself  constitute  revocation of a proxy.
On the  matters  coming  before the Annual  Meeting  for which a choice has been
specified  by  a  stockholder  by  means  of  the  ballot  on  the  proxy,   the
stockholder's shares will be voted accordingly.  If no choice is specified,  the
stockholder's  shares will be voted (i) "FOR" the  election of the two  nominees
for director listed in this Proxy Statement (two Class I Directors),  (ii) "FOR"
approval  of the  proposal  to  increase  the number of shares of the  Company's
Common Stock  available for issuance  under the Company's  1996 Stock  Incentive
Plan and to approve such plan as amended and restated,  (iii) "FOR"  approval of
the  proposal to increase  the number of shares of the  Company's  Common  Stock
available for issuance  under the Company's  1996 Employee  Stock Purchase Plan,
and (iv)  "FOR"  ratification  of the  appointment  of Ernst & Young  LLP as the
Company's  independent  auditors.  In the event that any other matters  properly
come before the Annual Meeting, the holders of proxies solicited by the Board of
Directors  will vote on those matters in  accordance  with their  judgment,  and
discretionary authority to do so is included in the proxy.


     Stockholders  of  record  at the close of  business  on June 29,  1998 (the
"Record  Date") are entitled to vote at the Annual  Meeting.  As of the close of
business on such date,  the Company had  13,952,981  shares of its Common  Stock
("Common  Stock")  outstanding.  Each holder of Common  Stock is entitled to one
vote for each share held as of the Record Date.

     The  presence  in person or by proxy of the  holders of a  majority  of the
issued and outstanding  Common Stock constitutes a quorum for the transaction of
business at the Annual  Meeting.  Directors are elected by a plurality vote. The
other matters  submitted for stockholder  approval at the Annual Meeting will be
decided  by the  affirmative  vote of a majority  of the shares of Common  Stock
represented  in  person or by proxy and  entitled  to vote on each such  matter.
Abstentions  with  respect  to any  matter  are  treated  as shares  present  or
represented and entitled to vote on that matter and thus have the same effect as
negative votes. If a broker who is the record holder of certain shares indicates
on a proxy  that he or she does not have  discretionary  authority  to vote on a
particular  matter  as to such  shares,  or if  shares  are not  voted  in other
circumstances  in which proxy  authority is defective or has been  withheld with
respect  to any  matter,  these  non-voted  shares  will be  counted  for quorum
purposes  but are not  deemed to be  present  or  represented  for  purposes  of
determining  whether  stockholder  approval  of a  particular  matter  has  been
obtained.

     The expense of printing and mailing  proxy  materials  will be borne by the
Company. In addition to the solicitation of proxies by mail, solicitation may be
made by  certain  Directors,  officers  and other  employees  of the  Company by
personal interview,  telephone or facsimile.  No additional compensation will be
paid to such persons for such solicitation. The Company will reimburse brokerage
firms and  others  for their  reasonable  expenses  in  forwarding  solicitation
materials to beneficial owners of Common Stock.

     This Proxy  Statement  and the  accompanying  form of proxy are first being
mailed to stockholders on or about July 15, 1998.

                                    IMPORTANT

Please  mark,  sign and date the enclosed  proxy and return it at your  earliest
convenience in the enclosed postage prepaid return envelope so that, whether you
intend to be  present at the Annual  Meeting or not,  your  shares can be voted.
This will not limit your rights to attend or vote at the Annual Meeting.



<PAGE>

                         ITEM 1 - ELECTION OF DIRECTORS


     The Company has three  classes of Directors  (designated  Class I, Class II
and Class III) serving staggered  three-year terms.  Presently,  three Directors
comprise each of Class I, Class II and Class III. However,  following the Annual
Meeting  the size of the Board of  Directors  will be reduced to eight,  and the
number of  Directors  in Class I will be reduced to two in order to  accommodate
this change. Accordingly,  two Class I Directors are to be elected at the Annual
Meeting.  Such Class I  Directors  will have terms  expiring  at the time of the
Annual Meeting of Stockholders to be held in 2001, or until each such Director's
successor  shall  have  been  elected  and  qualified.  Class II and  Class  III
Directors  will continue in office for their existing terms (which expire at the
Annual Meetings of Stockholders  to be held in 1999 and 2000,  respectively,  or
until each such Director's successor shall have been elected and qualified).

     Unless authority to vote for Directors is withheld, it is intended that the
shares represented by the enclosed proxy will be voted "FOR" the election of Dr.
Sadow and Mr.  Whitehead as Class I Directors.  In the event that either of such
nominees  becomes  unable or unwilling  to accept  nomination  or election,  the
shares  represented  by the enclosed proxy will be voted for the election of the
remaining  Director  named and such other person as the Board of  Directors  may
select. The Board of Directors has no reason to believe that either nominee will
be unable or unwilling to serve.


     Set  forth  below  is  information  regarding  the  nominees  for  Class  I
Directors,  as well as information  regarding the continuing  Class II and Class
III  Directors,   including  information  furnished  by  the  nominees  and  the
continuing  Directors as to their  principal  occupations at present and for the
past five years, certain directorships held by each and their ages as of May 15,
1998.

Name                                                                         Age
- ----                                                                         ---

CLASS I

Harvey S. Sadow, Ph.D. ...................................................    75

     Dr. Sadow has served as a Director of the Company since October 1992.
     From January 1988 through December 1990, Dr. Sadow served as Chairman
     of the  Board of  Boehringer  Ingelheim  Corporation  and  Boehringer
     Ingelheim Pharmaceuticals, Inc. Dr. Sadow served as the President and
     Chief Executive Officer of Boehringer Ingelheim Corporation until his
     retirement in January  1988.  Dr. Sadow serves as the Chairman of the
     Board of Cortex Pharmaceuticals,  Inc. and Cholestech Corp., and is a
     Director of Anika Therapeutics,  Inc. and Penederm  Corporation.  Dr.
     Sadow received a B.S. from the Virginia Military  Institute,  an M.S.
     from the  University  of Kansas and a Ph.D.  from the  University  of
     Connecticut.

Robert S. Whitehead ......................................................    48


     Mr. Whitehead has served as President and Chief Executive  Officer of
     the Company and as a Director of the Company  since August 1993.  Mr.
     Whitehead was also  appointed the Company's  Chairman of the Board of
     Directors and Acting Chief Financial  Officer in February 1998. As of
     June  29,  1998,  Mr.   Whitehead  is  also  the  President  of  Dura
     Pharmaceuticals,  Inc  ("Dura").  Prior to joining the  Company,  Mr.
     Whitehead was Senior Vice President,  Commercial  Operations,  Solvay
     Pharmaceuticals  ("Solvay")  from  February  1992 to April 1993.  Mr.
     Whitehead  is  on  the  Board  of  Directors  of  Spiros  Development
     Corporation II, Inc. Mr. Whitehead  graduated from Temple  University
     with a degree in pre-medicine.


                                    2

<PAGE>

CLASS II

Jeremy M. Levin, D. Phil., MB.BCHIR. ....................................     44

     Dr. Levin is Chairman of the Board of Directors of Physiome Sciences,
     Inc., a private  biocomputing  company.  Dr. Levin is a member of the
     Board  of   Directors  of  Orchid   Biocomputers,   Inc.,  a  private
     biotechnology  company, a member of the Board and Executive Committee
     of  the  New  York  Biotechnology  Association  and a  member  of the
     Emerging   Companies   Section   of   the   Biotechnology    Industry
     Organization. In addition, Dr. Levin is an advisor to several venture
     capital funds. Dr. Levin was the Chief Executive  Officer,  President
     and  Chairman  of the  Board of  Directors  of  Cadus  Pharmaceutical
     Corporation  ("Cadus")  from December  1992 until  January 1998.  Dr.
     Levin received a D.Phil.  in Molecular Biology from the University of
     Oxford and an MB.BCHIR from the University of Cambridge.

Lawrence D. Muschek, Ph.D. ..............................................     55

     Dr. Muschek has served as President,  Research and Development of the
     Company and as a Director of the Company since October 1997. Prior to
     joining the  Company,  Dr.  Muschek  worked for Solvay as Senior Vice
     President,  Research  and  Development  worldwide  from April 1994 to
     September  1997 and Senior Vice  President,  Research &  Development,
     United States from March 1990 to April 1994. Dr.  Muschek  received a
     B.S. in  Chemistry  from the  Philadelphia  College of  Pharmacy  and
     Science and a Ph.D. in Biochemistry from Michigan State University.

Anders P. Wiklund .......................................................     58

     Mr.   Wiklund   has  been  an  advisor  to  the   biotechnology   and
     pharmaceutical  industries  since  January  of 1997  when  he  formed
     Wiklund  International Inc. In 1997, Mr. Wiklund was appointed Senior
     Vice  President of Biacore  Holding,  Inc., a supplier of  analytical
     instruments to the life sciences industry. Between 1993 and 1996, Mr.
     Wiklund served as President of Pharmacia Development Corporation,  as
     Executive   Vice  President  of  Pharmacia  U.S.  Inc.  and  as  Vice
     President,  Pharmacia & Upjohn.  Prior to 1993,  Mr.  Wiklund  held a
     series of executive  management positions within the Pharmacia group,
     including  President  and CEO of Kabi Vitrum Inc. and Kabi  Pharmacia
     Inc. Mr. Wiklund is on the Board of Directors of InSite Vision, Inc.,
     Ribozyme Pharmaceuticals, Inc., Medivir AB and Vascular Therapeutics,
     Inc., a private biotechnology company. Mr. Wiklund graduated from the
     Pharmaceutical  Institute in Stockholm  where he received a Master of
     Pharmacy degree.

CLASS III

James C. Blair, Ph.D. ....................................................    59

     Dr. Blair has served as a Director of the Company  since May 1992 and
     served as Chairman  of the Board of  Directors  of the  Company  from
     September  1992 through  January  1998.  Dr. Blair has been a general
     partner of Domain Associates,  a venture capital management  company,
     since  1985.  Dr.  Blair is on the  Boards  of  Directors  of  Amylin
     Pharmaceuticals,  Inc., Aurora  Biosciences,  Inc.,  CoCensys,  Inc.,
     Dura, Gensia-Sicor,  Inc. ("Gensia"), and Vista Medical Technologies,
     Inc. Dr. Blair  received a B.S.E.  from  Princeton  University and an
     M.S.E.  and  Ph.D.  from  the  University  of  Pennsylvania,  all  in
     electronic engineering.

                                    3


<PAGE>

Harry D. Lambert ........................................................     59

     Mr. Lambert has served as a Director of the Company since April 1994.
     He has been a general  partner of InnoCal,  L.P.,  a venture  capital
     partnership,  since June 1993. Prior to joining InnoCal,  Mr. Lambert
     was a general partner of the Edison Venture Fund from January 1991 to
     June 1993.  Mr.  Lambert  received  his B.S.  from the U.S.  Military
     Academy at West Point,  and is a graduate of the Columbia  University
     Graduate School of Business Administration  Executive Program and the
     Harvard   Graduate   School  of  Business   Administration   Advanced
     Management Program.

Ronald R. Tuttle, Ph.D. .................................................     61

     Dr. Tuttle has served as a Director of the Company since May 1992. He
     served  as the  Company's  Executive  Vice  President,  Research  and
     Development,   from  January  1992  to  January  1996  and  as  Chief
     Scientific  Officer from January 1996 to December  1996.  Dr.  Tuttle
     received his Ph.D. in  Pharmacology  from the University of Manitoba,
     Canada.

Recommendation of the Board of Directors

THE BOARD OF DIRECTORS  RECOMMENDS A VOTE "FOR" ELECTION OF EACH OF THE NOMINEES
FOR A CLASS I DIRECTORSHIP AS SET FORTH ABOVE.

Board Meetings and Committees


     The Board of Directors held six meetings during the year ended December 31,
1997.  Each  Director  attended at least 75% of all meetings of (i) the Board of
Directors  during the period in 1997 in which such person  served as a Director,
with the exception of Mr. Cam L. Garner who attended 50% of the aggregate of the
Board meetings in which he was entitled to participate,  and (ii) all committees
of the Board of Directors  during the period in 1997 in which such person served
on such committees.


     The Board of Directors has appointed a Compensation  Committee and an Audit
Committee.

     The members of the  Compensation  Committee are Dr. Blair,  Mr. Lambert and
Mr.  Wiklund.  The  Compensation  Committee held five meetings  during 1997. The
Compensation  Committee administers the Company's 1996 Stock Incentive Plan, the
Company's 1996 Employee Stock Purchase Plan and the Officer and Associate  Bonus
Plan,  determines  compensation for the Company's  executive  officers and makes
decisions  concerning  salaries and  incentive  compensation  for  employees and
consultants of the Company.


     The members of the Audit Committee have been Mr. Garner,  Dr. Levin and Dr.
Sadow.  However,  following the Annual  Meeting the size of the Audit  Committee
will be reduced to two (Mr. Garner, who is retiring from Board service as of the
Annual Meeting,  will no longer be a member of the Audit  Committee).  The Audit
Committee  did not hold any meetings  during  1997.  The Audit  Committee  makes
recommendations to the Board of Directors regarding the selection of independent
auditors, reviews the results and scope of the audit and other services provided
by the Company's independent  auditors,  and reviews and evaluates the Company's
audit and control functions.


Compensation of Directors

     Directors  who are  employees  of the  Company do not  receive any fees for
service on the Board of Directors.  In May 1998, the Board approved a resolution
stating  that each  non-employee  Director  of the Company  shall  receive a per
meeting  fee of $1,000 for every  Board  meeting at which  such  director  is in
attendance  in person and $500 for every Board meeting at which such director is
in attendance by telephone  (plus $500 for each  committee  meeting  attended by
committee  members  in  person  and  $250  by  telephone).   In  addition,  each
non-employee   Director  of  the  Company   receives  an  initial   grant  of  a
non-qualified  option to purchase  15,000  shares of Common  Stock (an  "Initial
Option") and a yearly grant (following each Annual Meeting of Stockholders) of a
non-qualified  option to  purchase  5,000  shares of  Common  Stock (an  "Annual
Option").  The exercise price for each Initial Option and Annual Option is equal
to the fair market value of Common Stock on the date of 

                                       4

<PAGE>

grant.   Initial  Options  become   exercisable  in  12  equal  installments  at
three-month  intervals over the 36-month period commencing on the date of grant.
Annual Options vest in full on the earlier of the first  anniversary of the date
of grant or the date of the next Annual Meeting of  Stockholders.  Directors may
also be  reimbursed  for  certain  expenses in  connection  with  attendance  at
meetings of the Company's Board of Directors and its committees.

                                       5

<PAGE>

         SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

     The following table sets forth certain information as of May 15, 1998 as to
shares of Common  Stock  beneficially  owned by: (i) each person who is known by
the  Company to own  beneficially  more than 5% of the  issued  and  outstanding
Common Stock; (ii) each of the Company's Directors as well as certain affiliated
entities;    (iii)    each   of   the    individuals    named   in    "Executive
Compensation--Summary  Compensation  Table  below;" and (iv) all  directors  and
executive  officers of the Company as a group.  Ownership  information  is based
upon  information  furnished by the respective  individuals or entities,  as the
case may be.

<TABLE>
<CAPTION>
Directors, Nominees, Named Executive                                                                             Percent
Officers, 5% Stockholders, and Directors                                            Shares Beneficially        Beneficially
and Executive Officers as a Group                                                      Owned (1)(2)            Owned (1)(2)
- ---------------------------------                                                      ------------            ------------
<S>                                                                                        <C>                    <C> 


Amerindo Investment Advisors ...................................................             855,000               6.1%
   399 Park Avenue, 18th Floor
   New York, New York 10022
Biotechnology Investments Limited ..............................................           1,386,832               9.9
   Post Office Box 58
   St. Julian's Court
   St. Peter Port
   Guernsey, Channel Islands
Domain Partners II, L.P. .......................................................           1,444,084              10.3
   One Palmer Square
   Princeton, New Jersey 08542
Domain Partners III, L.P. ......................................................           1,336,699               9.6
   One Palmer Square
   Princeton, New Jersey 08542
DP III Associates, L.P. ........................................................              46,406                 *
   One Palmer Square
   Princeton, New Jersey 08542
Domain Associates ..............................................................               6,966                 *
   One Palmer Square
   Princeton, New Jersey 08542
Dura Pharmaceuticals, Inc. .....................................................             775,193               5.6
   7474 Lusk Boulevard
   San Diego, California 92121
InnoCal, L.P. (3) ..............................................................             658,143               4.7
   600 Anton Boulevard
   Costa Mesa, California 92626
James C. Blair (4) .............................................................           3,649,920              26.2
Cam L. Garner (5) ..............................................................             790,638               5.7
Harry D. Lambert (6) ...........................................................             658,143               4.7
Jeremy M. Levin (7) ............................................................               3,888                 *
Lawrence D. Muschek (8) ........................................................              50,000                 *
Harvey S. Sadow (9) ............................................................              24,515                 *
Ronald R. Tuttle (10) ..........................................................             248,438               1.8
Anders P. Wiklund (11) .........................................................               3,888                 *
Robert S. Whitehead (12) .......................................................             199,446               1.4
Michael J. Green (13) ..........................................................              31,691                 *
Bernard D. King ................................................................              44,605                 *
Terence E. McMorrow ............................................................              47,672                 *
All directors and executive officers as a group (13 persons)(14) ...............           4,984,711              35.7
</TABLE>

- --------------
*  Less than 1%.

(1)  Except  as  indicated  in the  footnotes  to this  table  and  pursuant  to
     applicable  community  property  laws,  the persons named in the table have
     sole  voting  and  investment  power  with  respect to all shares of Common
     Stock.

                                       6

<PAGE>

(2)  The number of shares of Common Stock beneficially owned includes the shares
     issuable  pursuant to stock  options that may be  exercised  within 60 days
     after May 15,  1998.  Shares  issuable  pursuant to such options are deemed
     outstanding  for  purposes of  computing  the  percentage  ownership of the
     person holding such options but are not deemed  outstanding for purposes of
     computing the percentage ownership of any other person.

(3)  Includes 16,142 shares issuable upon exercise of options  beneficially held
     by InnoCal,  L.P. that are exercisable  within the 60-day period  following
     May 15, 1998.


(4)  Includes  10,572 shares issuable upon exercise of options held by Dr. Blair
     that are exercisable  within the 60-day period following May 15, 1998. Also
     includes  1,444,084 shares  beneficially owned by Domain Partners II, L.P.,
     1,336,699 shares  beneficially  owned by Domain Partners III, L.P.,  46,406
     shares  beneficially  owned by DP III  Associates,  L.P.  and 6,966  shares
     beneficially owned by Domain Associates.  Dr. Blair is a general partner of
     One Palmer Square  Associates,  II, L.P.,  which is the general  partner of
     Domain  Partners II, L.P.,  and he is also a general  partner of One Palmer
     Square  Associates,  III, L.P., the general partner of Domain Partners III,
     L.P. and DP III  Associates,  L.P. Dr. Blair is a general partner of Domain
     Associates.  Dr. Blair disclaims beneficial ownership of shares held by One
     Palmer Square Associates,  II, L.P. and One Palmer Square Associates,  III,
     L.P.  which are not actually  distributed  to him.  Also  includes  775,193
     shares  beneficially  owned by Dura.  Dr.  Blair is a director  of Dura and
     disclaims beneficial ownership of shares held by Dura.


(5)  Includes  775,193  shares  beneficially  owned by Dura. Mr. Garner is Chief
     Executive  Officer and Chairman of the Board of Dura. Mr. Garner  disclaims
     beneficial  ownership  of  shares  held by  Dura.  Includes  14,887  shares
     issuable upon  exercise of options held by Mr. Garner that are  exercisable
     within the 60-day period following May 15, 1998.

(6)  Includes 642,001 shares beneficially owned by InnoCal,  L.P. Mr. Lambert is
     a general  partner of InnoCal  Associates,  L.P.,  the  general  partner of
     InnoCal, L.P. Also includes 16,142 shares issuable upon exercise of options
     beneficially held by InnoCal,  L.P. that are exercisable  within the 60-day
     period following May 15, 1998. Mr. Lambert disclaims  beneficial  ownership
     of the shares issued or issuable to InnoCal,  L.P.  except to the extent of
     his pecuniary interest therein.

(7)  Includes  3,888 shares  issuable upon exercise of options held by Dr. Levin
     that are exercisable within the 60-day period following May 15, 1998.

(8)  Includes  49,000  shares  issuable  upon  exercise  of options  held by Dr.
     Muschek that are  exercisable  within the 60-day  period  following May 15,
     1998.

(9)  Includes  13,055 shares issuable upon exercise of options held by Dr. Sadow
     that are exercisable within the 60-day period following May 15, 1998.

(10) Includes 35,359 shares issuable upon exercise of options held by Dr. Tuttle
     that are exercisable within the 60-day period following May 15, 1998.

(11) Includes 3,888 shares issuable upon exercise of options held by Mr. Wiklund
     that are exercisable within the 60-day period following May 15, 1998.

(12) Includes  193,487  shares  issuable  upon  exercise of options  held by Mr.
     Whitehead that are exercisable  within the 60-day period  following May 15,
     1998.

(13) Includes  29,534 shares issuable upon exercise of options held by Dr. Green
     that are exercisable within the 60-day period following May 15, 1998.

(14) Includes  376,872  shares  issuable  upon  exercise  of  options  that  are
     exercisable  within the 60-day  period  following  May 15,  1998.  Includes
     1,444,084 shares held by Domain Partners II, L.P., 1,336,699 shares held by
     Domain Partners III, L.P.,  46,406 shares held by DP III Associates,  L.P.,
     and 6,966  shares held by Domain  Associates. See

                                       7

<PAGE>

     footnote (4).  Includes 775,193 shares held by Dura and 642,001 shares held
     by InnoCal, L.P. See footnotes (3), (4), (5) and (6).

             SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

     Under the securities  laws of the United States,  the Company's  Directors,
executive  officers  and any  persons  holding  more than 10% of the  issued and
outstanding  Common  Stock are  required to report  their  initial  ownership of
Common  Stock,  any  subsequent  changes  in  that  ownership  and,  in  certain
instances,  an annual  statement of changes in ownership to the  Securities  and
Exchange Commission.  Specific due dates for these reports have been established
and the Company is required to identify  those  persons who failed to file these
reports in a timely  manner.  In making this  disclosure  the Company has relied
solely upon the written  representations of its Directors and executive officers
and copies of the  reports  that have been  filed  with the SEC.  Based upon the
Company's review of such  representations and reports, the Company believes that
all such reports  were filed on a timely  basis for the year ended  December 31,
1997.

                                       8

<PAGE>

                             EXECUTIVE COMPENSATION

Summary  Compensation Table

     The following table  summarizes all  compensation  paid in the fiscal years
ended  December 31, 1997,  1996 and 1995 to (i) the  Company's  Chief  Executive
Officer  and  (ii)  certain  of the  Company's  other  most  highly  compensated
executive officers during 1997.

<TABLE>
<CAPTION>
                                                                                                       Long Term
                                                                                                      Compensation
                                                                                                         Awards
                                                              Annual Compensation                      Number of
                                                 -------------------------------------------------     Securities
                                                                                      Other Annual     Underlying       All Other
Name and Principal Position                      Year     Salary (1)       Bonus      Compensation    Options(#)(2)  Compensation(3)
- ---------------------------                      ----     ----------       -----      ------------    -------------  ---------------
<S>                                              <C>       <C>            <C>           <C>              <C>            <C>  
Robert S. Whitehead                              1997      $290,625       $62,550       $31,250(4)          --           2,000
President and Chief Executive Officer            1996       254,167        24,300        25,000(4)       151,627         1,333
                                                 1995       225,000          --          25,000(4)          --           2,000

Lawrence D. Muschek (5)                          1997        52,083          --            --            200,000        20,841
President, Research and Development              1996          --            --            --               --            --
                                                 1995          --            --            --               --            --

Michael J. Green                                 1997       175,000        96,837          --             25,000        13,820
Vice President, Chemistry                        1996       141,288          --            --             30,232        38,080
                                                 1995          --            --            --               --            --

Bernard D. King (6)                              1997       164,180        39,750          --               --          10,395
Executive Vice President, Biological             1996       195,000          --            --             62,557         2,000
Sciences and Development                         1995       179,500          --            --             58,139         2,000

Terence E. McMorrow (7)                          1997        83,542        36,750          --               --         107,140
Vice President, Finance and                      1996       145,000        27,000          --             33,069        31,640
Corporate Development, and Secretary             1995       145,000          --            --               --           2,000
</TABLE>

- -----------
(1)  Includes amounts deferred pursuant to the Company's 401(k) Plan.

(2)  In January 1996, the unvested portions of certain options granted under the
     Company's  Amended  and  Restated  1992  Stock  Plan  for  certain  Company
     executive officers were canceled and options  exercisable for share amounts
     equivalent to such canceled  portions were granted under the Company's 1995
     Stock Plan to such  executives  (the  "Regranted  Options").  Although  the
     exercise  price of the Regranted  Options ($2.15 per share of Common Stock)
     represented  an increase over the exercise  prices of the canceled  options
     (ranging  from  $.7525 to $1.075 per share of Common  Stock),  the  Company
     agreed to  distribute to each  executive,  at the time of any exercise of a
     Regranted  Option,  an  amount  equal to the  increase  in  exercise  price
     incurred. The Regranted Options retain the vesting schedule of the canceled
     options.  The Regranted  Options  include options to acquire 45,348 shares,
     26,093  shares  and  58,604  shares  for Dr.  King,  Mr.  McMorrow  and Mr.
     Whitehead, respectively.

(3)  Includes reimbursement for relocation expenses paid to Dr. Muschek ($20,841
     in 1997),  Dr. Green ($11,820 in 1997 and $36,080 in 1996) and Mr. McMorrow
     ($12,453  in 1997  and  $29,640  in  1996);  compensation  to Mr.  McMorrow
     ($28,049 in 1997) for the exercise of Regranted  Options;  compensation  to
     Mr.  McMorrow  ($44,923  in  1997)  pursuant  to a  consulting  arrangement
     implemented following his resignation from the Company on June 30, 1997; as
     well as  amounts  paid in 1997 to Dr.  King  and Mr.  McMorrow  for  earned
     vacation in connection with their respective  resignations from the Company
     on October 24, 1997 and June 30, 1997  ($8,395 for Dr. King and $20,631 for
     Mr.

                                       9

<PAGE>

     McMorrow).  The balance of these  amounts  reflect the  Company's  matching
     contributions pursuant to the Company's 401(k) plan.

(4)  In 1994, the Company loaned Mr. Whitehead $100,000, which is evidenced by a
     promissory  note. The loan bears simple  interest at prime rate plus 1% per
     annum, with interest payable  quarterly.  The original  principal amount of
     the loan is forgiven at a rate of 25% per year on the  anniversary  date of
     the note. In 1997, the Company loaned Mr. Whitehead an additional  $100,000
     which is evidenced by a promissory  note having the same terms as the first
     loan.  Amounts reflected  represent the recognition of compensation for the
     forgiveness of principal on the loans.

(5)  Dr.  Muschek  joined the Company on October 6, 1997.  In 1997,  the Company
     loaned Dr. Muschek  $75,000,  which was evidenced by a promissory note. The
     loan was repaid in full, in the third  quarter  1997,  with interest at the
     prime rate plus 1% per annum.

(6)  Dr. King resigned from his position with the Company on October 24, 1997.

(7)  Mr. McMorrow resigned from his position with the Company on June 30, 1997.

Stock Options

     The following tables set forth certain  information as of December 31, 1997
and for the fiscal  year then ended  with  respect to options to acquire  Common
Stock  granted  to  and  exercised  by the  individuals  named  in  the  Summary
Compensation  Table  above.  No stock  appreciation  rights have been granted to
date.

                                                     Option Grants in 1997
<TABLE>
<CAPTION>

                                                   Individual Grants                                   Potential Realizable      
                           -------------------------------------------------------------------           Value at Assumed        
                            Number of        Percentage of                                            Annual Rates of Stock      
                            Securities       Total Options                                              Price Appreciation       
                            Underlying         Granted to          Exercise                            for Option Term (5)       
                             Options          Employees in           Price        Expiration      -------------------------------
    Name                    Granted (#)       Fiscal Year         ($/Sh) (3)       Date (4)          5% ($)          10% ($)
    ----                   -------------    -----------------     ------------    ------------    -------------   ---------------
<S>                         <C>                   <C>               <C>            <C>             <C>             <C>        
Lawrence D. Muschek         200,000 (1)           32.5%             $ 4.63         10/06/07        $ 302,089       $ 1,506,634
Michael J. Green             25,000 (2)            4.1                4.38          4/25/07           68,785           174,316
</TABLE>

- ----------
(1)  The options  granted to Dr.  Muschek are subject to the  following  vesting
     schedule:  (i) 10% of the shares  subject to the option vested three months
     following  the date of  grant;  and (ii) 6% of the  shares  subject  to the
     option vest at the end of each successive  three-month period following the
     vesting of the initial 10% (thus permitting 100% vesting over the course of
     48 months);  provided that these  options,  subject to certain  conditions,
     immediately vest upon a merger,  reorganization  or other change in control
     of the Company.

(2)  The  options  granted to Dr.  Green are  subject to the  following  vesting
     schedule:  (i) 4% of the shares  subject to the option  immediately  vested
     upon grant; and (ii) 6% of the shares subject to the option vest at the end
     of each successive three-month period following the date of the grant (thus
     permitting 100% vesting over the course of 48 months);  provided that these
     options,  subject to certain  conditions,  immediately  vest upon a merger,
     reorganization or other change in control of the Company.

(3)  The exercise  price on the date of grant was equal to 100% of the per share
     fair market value of Common Stock on the date of grant.

                                       10

<PAGE>

(4)  The  options  have a term of 10 years,  subject to earlier  termination  in
     certain events related to termination of employment.

(5)  The 5% and 10% assumed annual rates of compounded stock price  appreciation
     are suggested by rules of the Securities and Exchange Commission and do not
     represent  Company  estimates or projections  regarding the future price of
     Common Stock.  There can be no assurance  provided to any executive officer
     or any other  holder of the  Company's  securities  that actual stock price
     movement  over the  10-year  option  term will be at the assumed 5% and 10%
     levels of appreciation, or any other defined level.

                                     Aggregated Option Exercises in 1997
                                       and 1997 Year-End Option Values

<TABLE>
<CAPTION>
                                                                 Number of                      Value of
                                                           Securities Underlying               Unexercised
                           Shares                           Unexercised Options           in-the-Money Options
                          Acquired                        at December 31, 1997(#)        at December 31, 1997(1)
                             on            Value        ----------------------------   ----------------------------
Name                     Exercise (#)     Realized      Exercisable   Unexercisable    Exercisable   Unexercisable
- ----                     ------------    -----------    ------------  --------------   ------------  --------------
<S>                        <C>            <C>             <C>              <C>          <C>             <C>     
Robert S. Whitehead              -        $     -         182,325          50,232       $ 347,843       $ 64,674
Lawrence D. Muschek              -              -               -         200,000               -              -
Michael J. Green                 -              -          17,907          37,325          17,905         21,018
Bernard D. King                  -              -          44,092               -          70,519              -
Terence E. McMorrow         46,510         94,379(2)            -               -               -              -
</TABLE>

- ----------
(1)  Calculated  on the basis of (i) the fair  market  value of Common  Stock at
     December 31, 1997 ($3.4375 per share) minus (ii) the exercise price.

(2)  Calculated  on the basis of (i) the fair  market  value of Common  Stock at
     September 25, 1997 ($3.875 per share) minus (ii) the exercise price


Executive  Employment  Agreements  and  Termination  of Employment and Change in
Control Arrangements

     Pursuant to the terms of an Executive Employment Agreement dated August 16,
1993 between the Company and Robert S.  Whitehead,  the Company agreed to retain
Mr.  Whitehead as  President  and Chief  Executive  Officer of the Company at an
annual  salary of $225,000.  In May 1997,  this amount was increased to $300,000
per year.  The  Agreement  also  provides  that Mr.  Whitehead  is entitled to a
continuation  of 75% of his base  salary for up to 180 days if he is  terminated
without  cause.  In connection  with the  Agreement,  Mr.  Whitehead was granted
options to acquire  139,534  shares of Common Stock at $0.75 per share  (vesting
over four years). Of this amount, options to acquire 58,604 shares were canceled
under the original  grant and  regranted in January  1996,  but with an exercise
price of $2.15 per share (although arrangements have been made by the Company to
distribute to Mr. Whitehead an amount equal to the difference in exercise prices
upon any  exercise - see  "Certain  Transactions"  below).  In March  1994,  the
Company also made a loan in the principal  amount of $100,000 to Mr.  Whitehead.
The  principal  amount of the loan was  forgiven  on a  quarterly  basis  over a
four-year  term,  which ended in the first  quarter of 1998.  In July 1997,  the
Company made an  additional  loan to Mr.  Whitehead in the  principal  amount of
$100,000 with the same terms as the first loan.

     Pursuant to the terms of an Executive Employment Agreement dated October 6,
1997 between the Company and Lawrence D. Muschek,  the Company  agreed to retain
Dr.  Muschek as President,  Research &  Development  of the Company at an annual
salary  of  $250,000.  The  Agreement  also  provides  that  if Dr.  Muschek  is
terminated  without  cause,  he is  entitled  to the  balance of his base salary
during the period from the date of termination  through October 6, 1999, the end
of the term of the

                                       11

<PAGE>

Agreement. In connection with the Agreement,  Dr. Muschek was granted options to
acquire  200,000  shares of Common Stock at $4.625 per share  (vesting over four
years).

     Options  granted to officers and directors of the Company vest fully in the
event  the  Company  is  subject  to a change  in  control  (as  defined  in the
respective stock option plans under which such options are granted).

                                       12

<PAGE>

                      REPORT OF THE COMPENSATION COMMITTEE
               OF THE BOARD OF DIRECTORS ON EXECUTIVE COMPENSATION

     This  Report  shall not be deemed  incorporated  by  reference  by any
     general statement  incorporating by reference this Proxy Statement (or
     any specific statement incorporating by reference any other portion of
     this Proxy Statement) into any filing under the Securities Act of 1933
     or under the Securities Exchange Act of 1934, except to the extent the
     Company specifically  incorporates this Report by reference,  and this
     Report shall not otherwise be deemed filed under such Acts.

     This report on  executive  compensation  is  provided  by the  Compensation
Committee of the Board of Directors  (the  "Compensation  Committee")  to assist
stockholders  in  understanding  the  Compensation  Committee's  objectives  and
procedures in establishing the compensation of the Company's  executive officers
and describes the basis on which 1997 compensation  determinations  were made by
the Compensation  Committee.  The  Compensation  Committee is comprised of three
non-employee  Directors (Dr. Blair, Mr. Lambert and Mr. Wiklund).  In making its
determinations,  the  Compensation  Committee  relied,  in part, on  independent
surveys and public disclosures of compensation of management of companies in the
biotechnology and biopharmaceutical industries.

Compensation Philosophy and Objectives

     The  Compensation  Committee  believes the  compensation  of the  Company's
executive officers should:

     o    Encourage  creation of stockholder  value and achievement of strategic
          corporate objectives.

     o    Integrate   compensation  with  the  Company's  annual  and  long-term
          objectives  and  strategy,   and  focus  executive   behavior  on  the
          fulfillment of those objectives.

     o    Enable the Company to attract and retain,  on a long-term basis,  high
          caliber personnel by providing a total  compensation  opportunity that
          is   competitive   with   companies  in  the   biopharmaceutical   and
          biotechnology  industries,  taking into account relative company size,
          performance   and   geographic   location,   as  well  as   individual
          responsibilities and performance.

     o    Align the  interests  of  management  and  stockholders  by  providing
          management with longer term incentives through equity ownership.

Key Elements of Executive Compensation

     Because the Company is still at an early stage of its development,  the use
of  traditional  performance  standards,  such as profit  levels  and  return on
equity, is not appropriate in the evaluation of executive  officer  performance.
Accordingly,  the  compensation  of executive  officers is based, in substantial
part, on the Company's  achievement  of key corporate  objectives  including the
closing of equity  financings,  the  execution  of corporate  and  collaborative
agreements,  the development or acquisition of drug discovery  technologies  and
development  progress of compounds  proprietary  to the Company,  as well as the
achievement of individual  business  objectives by each executive  officer.  The
Company's  existing  compensation  structure for executive  officers  includes a
combination  of salary  and stock  options  and may  include  cash  bonuses  for
performance determined to be deserving by the Compensation Committee.

     Salary.  Salary  levels are largely  determined  through  comparisons  with
companies of similar  headcount and market  capitalization  and/or complexity in
the biopharmaceutical and biotechnology industries. Actual salaries are based on
individual performance  contributions within a competitive salary range for each
position that is established through evaluation of  responsibilities  and market
comparisons.  The  Compensation  Committee,  on the  basis of its  knowledge  of
executive compensation in the industry, believes that the Company's salaries for
its executive  officers are at levels that the  Compensation  Committee,  at the
time such salary  determinations  were made,  considered  to be  reasonable  and
appropriate  given  the  Company's  financial  resources  and the  stage  of its
development.

                                       13

<PAGE>

     Stock Options. The Compensation  Committee believes that by providing those
persons who have substantial responsibility for the management and growth of the
Company with an opportunity to increase  their  ownership of Company stock,  the
best interests of stockholders  and executive  officers will be closely aligned.
Therefore,  executive  officers are eligible to receive  stock  options when the
Compensation   Committee  performs  its  annual  salary  review;   although  the
Compensation Committee,  at its discretion,  may grant options at other times in
recognition of exceptional  achievements.  The number of shares underlying stock
options granted to executive  officers is based on competitive  practices in the
industry as determined by independent  surveys and the Compensation  Committee's
knowledge of industry  practice.  The  Company's  1996 Stock  Incentive  Plan is
administered by the Compensation Committee.

     Cash  Bonuses.  Cash  bonuses  paid to certain of the  Company's  executive
officers in 1997 were based upon the achievement of specific objectives pursuant
to the  Company's  Officer and Associate  Bonus Plan.  The Officer and Associate
Bonus Plan utilized in 1997 was approved by the  Compensation  Committee in 1996
and the  Compensation  Committee  approved the  specific  awards made under that
plan.

     The  Compensation  Committee may, at its discretion,  award cash bonuses in
recognition of performance deemed to be deserving by the Compensation Committee.
Any such  bonuses  will be  determined  by the  Compensation  Committee to be in
amounts that the Compensation  Committee,  at the time such  determinations  are
made,  considers to be reasonable  given the Company's  financial  resources and
stage of  development  as well as  achievement  of  Company-wide  and individual
goals.

Chief Executive Officer Compensation

     Robert S. Whitehead is the Company's  Chairman and Chief Executive Officer,
and as of February 1998, the Company's acting Chief Financial Officer. Effective
May 1, 1997, Mr.  Whitehead's annual salary increased from $275,000 to $300,000.
Factors that the Compensation  Committee  considered in establishing this annual
salary included the following Company  achievements since Mr. Whitehead's tenure
through  April 1997:  the  Company's  increased  financial  stability  through a
successful completion of an initial public offering, several private financings,
and  through the  establishment  of funded drug  discovery  collaborations  with
Chugai  Biopharmaceuticals,  Novo Nordisk A/S and The Procter & Gamble  Company;
the initiation and growth of an internal small molecule combinatorial  chemistry
program and the reduction of reliance on external vendors for research  support;
and the initiation of Phase I and Phase II clinical trials of the Company's lead
compound (HP 228).

     Mr. Whitehead received bonuses totaling $62,550 in 1997 under the Company's
Officer  and  Associate  Bonus  Plan  based  upon  the  achievement  of  certain
objectives pursuant to such plan.

Compensation Committee

     James C. Blair, Ph.D.
     Harry D. Lambert
     Anders P. Wiklund

Compensation Committee Interlocks and Insider Participation

     During 1997, the Compensation Committee consisted of Dr. Blair, Mr. Lambert
and Mr. Wiklund, each of whom is an outside Director of the Company. None of the
members of the Compensation Committee had any "interlock" relationship to report
during the Company's fiscal year ended December 31, 1997.

                                       14

<PAGE>

                              CERTAIN TRANSACTIONS


Other Arrangements

     Jeremy M. Levin,  a current  member of the  Company's  Board of  Directors,
prior to December 31,  1997,  was the Chief  Executive  Officer,  President  and
Chairman  of  the  Board  of  Directors  of  Cadus  Pharmaceutical   Corporation
("Cadus"). The Company and Cadus are parties to a joint discovery alliance which
commenced  in  January  1995.  Pursuant  to this  arrangement,  the  Company  is
providing  Cadus with  access to the  Company's  combinatorial  libraries  at no
charge in exchange for joint  ownership  of any  resulting  discoveries.  During
1997, no amounts were paid either to Cadus from the Company or from Cadus to the
Company pursuant to this or any other relationship between parties.


     In  February  1996,  the  Company  entered  into  an  agreement  with  Dura
Pharmaceuticals,  Inc. which  requires,  among other things,  the Company to pay
Dura $6,000,000 over four years for product  development (the "Dura Agreement").
As of December 31, 1997,  $3,154,000  had been funded under the Dura  Agreement.
Cam L.  Garner,  a member of the Board of  Directors  of the  Company,  is Chief
Executive  Officer and  Chairman  of the Board of  Directors  of Dura.  James C.
Blair,  a member of the Board of Directors of Dura,  is a member of the Board of
Directors of the Company.  As of July 1, 1998,  Robert S.  Whitehead,  the Chief
Executive Officer and Chairman of the Board of Directors of the Company,  is the
President of Dura. In addition,  Mr. Garner and Mr. Whitehead are members of the
Board of  Directors  of  Spiros  Development  Corporation  II,  Inc.,  a private
research and development company for which Dura performs certain work concerning
applications  of Dura's drug delivery  technology.  In connection  with the Dura
Agreement, Dura invested $5,000,000 in the Company's stock (originally shares of
Series G Preferred  Stock which  converted  into 775,193  shares of Common Stock
upon the consummation of the Company's initial public offering).


     On September 19, 1997, the Company  advanced to its  President,  Research &
Development,  Lawrence  D.  Muschek,  Ph.D.,  a loan in the  amount of  $75,000.
Interest  accumulated on the outstanding  principal  balance at the rate of 9.5%
per annum  from the date of the note  until  paid in full.  The note was due and
payable on November 19, 1997.  However,  the principal balance of the loan, plus
applicable interest, was paid to the Company in full on November 7, 1997.

     On July 3, 1997,  the  Company  advanced  to its Chief  Executive  Officer,
Robert S.  Whitehead,  a  forgivable  loan in the amount of  $100,000  due on or
before  June 11,  2001.  Interest  on the loan,  calculated  at prime plus 1% in
effect from time to time, is payable quarterly, with the principal balance to be
forgiven in equal  quarterly  installments  of $6,250  until  either the loan is
forgiven in full or the total amount of the  forgiveness  and principal  paid in
lawful money equals the original  principal amount of the note. The note, to the
extent unpaid or unforgiven, becomes due and payable upon the termination of Mr.
Whitehead's  employment.  In March 1994,  the Company made a similar loan to Mr.
Whitehead in the initial amount of $100,000 with the same terms as the July 1997
note.

                                       15

<PAGE>

                          STOCK PRICE PERFORMANCE GRAPH

          This Graph shall not be deemed  incorporated by reference by
          any general statement  incorporating by reference this Proxy
          Statement  (or  any  specific  statement   incorporating  by
          reference  any other portion of this Proxy  Statement)  into
          any  filing  under the  Securities  Act of 1933 or under the
          Securities  Exchange  Act of 1934,  except to the extent the
          Company  specifically  incorporates this Graph by reference,
          and this Graph  shall not  otherwise  be deemed  filed under
          such Acts.

     The  following  graph  illustrates  a comparison  of the  cumulative  total
stockholder return (change in stock price plus reinvested  dividends) of (a) the
Company's  Common Stock with (b) each of (i) the CRSP Total Return Index for The
Nasdaq  Stock  Market  (U.S.)  and (ii) the CRSP Total  Return  Index for Nasdaq
Pharmaceutical  Stocks  (the  "Nasdaq   Pharmaceutical   Index"),   assuming  an
investment  of $100 in each on April 1, 1996 (the  first  date of trading in the
Company's  Common Stock following the Company's  initial public  offering).  The
comparisons in the graph are required by the Securities and Exchange  Commission
and are not  intended  to  forecast  or be  indicative  of the  possible  future
performance of an investment in the Company's Common Stock.

- --------------------------------------------------------------------------------
  [THE FOLLOWING TABLE WAS REPRESENTED BY A LINE CHART IN THE PRINTED MATTER]
- --------------------------------------------------------------------------------

                                           4/1/96   12/31/96  6/30/97   12/31/97
                                           ------   --------  -------   --------
Trega Biosciences, Inc. ...............    $100.00    56.76     66.22     37.16
Nasdaq Stock Market ...................     100.00   116.94    130.93    143.56
Nasdaq Pharmaceutical Index ...........     100.00    95.84    113.63     99.22

     The Nasdaq Pharmaceutical Index includes all companies listed on The Nasdaq
Stock Market within SIC Code 283. A list of the companies included in the Nasdaq
Pharmaceutical  Index may be obtained  upon request to Office of the  Secretary,
Trega  Biosciences,  Inc., 9880 Campus Point Drive, San Diego,  California 92121
(or (619) 410-6500).

                                       16

<PAGE>

          ITEM 2 - PROPOSAL TO INCREASE THE NUMBER OF SHARES AVAILABLE
               UNDER THE 1996 STOCK INCENTIVE PLAN AND TO APPROVE
                        SUCH PLAN AS AMENDED AND RESTATED


     The Company has adopted,  and presently  utilizes,  a 1996 Stock  Incentive
Plan  under  which  2,960,465  shares of Common  Stock  have been  reserved  for
issuance,  either  by  direct  sale or  upon  exercise  of  options  granted  to
employees,   Directors,   consultants  and  advisors  of  the  Company  and  its
subsidiary.  As of May 11, 1998,  the Board of Directors  amended the 1996 Stock
Incentive  Plan to reserve an  additional  2,000,000  shares of Common Stock for
issuance  thereunder,  subject to the approval of the Company's  stockholders at
the  Annual  Meeting.  The Board of  Directors  has also  recently  amended  and
restated the 1996 Stock Incentive Plan (as amended and restated, the "1996 Stock
Plan") to (i) increase the number of shares subject to initial and annual option
grants to outside Directors (from 10,000 and 3,500, respectively,  to 15,000 and
5,000,  respectively)  and (ii) increase the maximum number of shares subject to
options or stock  appreciation  rights  ("SARs") which may be granted to any one
individual  in any calendar  year  (increasing  the number of shares  subject to
options or SARs which may be granted to any one  individual in any calendar year
from  250,000 to 450,000).  A copy of the 1996 Stock Plan is attached  hereto as
Appendix A.


1996 Stock Plan


     The 1996 Stock Plan was  originally  adopted by the Board of  Directors  on
February  7, 1996 and  approved  by the  Company's  stockholders  in March 1996,
becoming  effective  upon  the  consummation  of the  Company's  initial  public
offering  in  April  1996.  In  addition  to the  reservation  of an  additional
2,000,000  share of Common  Stock for  issuance  under the 1996 Stock  Plan,  an
amendment  to Section  4.2(c) of the 1996 Stock Plan,  to increase the number of
shares of Common  Stock  subject to options  for  initial  and annual  grants to
outside  Directors  (from 10,000 and 3,500,  respectively,  to 15,000 and 5,000,
respectively),  was approved by the Board of Directors on May 11, 1998 (the "May
Amendment"). In addition, an amendment to Sections 5.2 and 7.2 of the 1996 Stock
Plan,  to increase the number of options or SARs any  individual  may receive in
any calendar year  (increasing  the number of shares  subject to options or SARs
granted to any one individual in any calendar year from 250,000 to 450,000), was
also  approved  by the  Board  of  Directors  as of June  29,  1998  (the  "June
Amendment").  With  respect  to the  June  Amendment,  the  Board  of  Directors
determined  that  modifications  to the 1996 Stock Plan  effected  thereby  were
necessary  in order to provide  the  Company  with  appropriate  flexibility  in
utilizing the 1996 Stock Plan for its intended purposes (e.g.,  granting options
for executive level positions).  With respect to the May Amendment, the Board of
Directors  determined that modifications to the 1996 Stock Plan effected thereby
were  necessary  in order to provide the  Company's  outside  Directors  with an
appropriate level of compensation for their services to the Company.


     Approval by the Company's  stockholders of this proposal shall be deemed to
be (i)  approval of the  increase by 2,000,000 in the number of shares of Common
Stock  available for issuance under the 1996 Stock Plan, (ii)  ratification  and
approval  of the June  Amendment,  (iii)  ratification  and  approval of the May
Amendment and (iv)  ratification  and approval of the 1996 Stock Plan as amended
and restated (in the form attached hereto as Appendix A).

     The 1996 Stock Plan replaced the 1992 Plan and the 1995 Plan (collectively,
the  "Predecessor  Plans"),  although  awards made under the  Predecessor  Plans
continue to be  administered  in  accordance  with the  Predecessor  Plans.  The
outstanding  options under the Predecessor Plans contain  substantially the same
terms and  conditions  specified  below for option  grants  under the 1996 Stock
Plan.


     The 1996 Stock Plan is  administered by the  Compensation  Committee of the
Board of  Directors.  Employees,  Directors,  consultants  and  advisors  of the
Company (or any  subsidiary of the Company) are eligible to  participate  in the
1996 Plan, although incentive stock options may be granted only to employees. As
of May 15, 1998, there were 115 employees, officers and outside Directors of the
Company and its subsidiary (ChromaXome Corp.). As restated,  individuals will be
eligible to receive  options or SARs under the 1996 Stock Plan  covering no more
than  450,000  shares in any calendar  year.  The  participation  of the outside
Directors  of the Company is limited to automatic  initial and annual  grants of
nonstatutory stock options (the "Initial and Annual Options"  referenced

                                       17

<PAGE>

above - see "Item 1 - Election of Directors  --Compensation of Directors").  The
Initial  and Annual  Options  are  further  described  below.  The  Compensation
Committee  selects  the  employees  of the  Company  who  will  receive  awards,
determines  the  size  of  any  award  and  establishes  any  vesting  or  other
conditions. Therefore, the benefits and amounts that will be received by each of
the "named"  executive  officers  (those  officers  identified  in the  "Summary
Compensation Table" above -- see "Executive  Compensation  Summary  Compensation
Table"),  the executive  officers as a group and all other key employees are not
presently  identifiable.  However,  in 1997,  aside from options  granted to the
"named"  executive  officers  (identified  above in "Executive  Compensation  --
Summary  Compensation  Table,"  "--  Option  Grants in 1997" and "--  Aggregated
Option  Exercises in 1997 and 1997 Year-End  Option  Values") and Annual Options
granted  to each of the seven  outside  Directors  (see "Item 1 --  Election  of
Directors -- Compensation of Directors"), 86 persons received options to acquire
Common Stock under the 1996 Stock Plan. Except for one "named" executive officer
(identified above in "Executive Compensation -- Summary Compensation Table," "--
Option  Grants in 1997" and "--  Aggregated  Option  Exercises  in 1997 and 1997
Year-End Option Values"),  no one person received one or more options to acquire
more than 5% of the shares of Common  Stock for which  options  were  granted in
1997.


     The 1996 Stock Plan provides for awards in the form of  restricted  shares,
stock units, options or SARs, or any combination thereof. No payment is required
upon receipt of an award,  except that a recipient  of newly  issued  restricted
shares must pay at least the par value of such restricted shares to the Company.

     Restricted shares are shares of Common Stock that are subject to forfeiture
in the event that the applicable vesting conditions are not satisfied,  and such
shares are  nontransferable  prior to vesting (except for certain transfers to a
trustee).  Restricted  shares have the same voting and dividend  rights as other
shares of Common Stock.

     A stock unit is an unfunded  bookkeeping entry  representing the equivalent
of one share of Common Stock,  and it is  nontransferable  prior to the holder's
death.  A holder of stock units has no voting  rights or other  privileges  as a
stockholder,  but may be entitled to receive dividend  equivalents  equal to the
amount of dividends paid on the same number of shares of Common Stock.  Dividend
equivalents may be converted into additional  stock units or settled in the form
of cash, Common Stock or a combination of both. Stock units, when vested, may be
settled  by   distributing   shares  of  Common  Stock  or  by  a  cash  payment
corresponding  to the fair  market  value of an  equivalent  number of shares of
Common Stock,  or a combination  of both.  Vested stock units will be settled at
the time determined by the Compensation  Committee. If the time of settlement is
deferred,  interest or additional  dividend  equivalents  may be credited on the
deferred payment.

     The recipient of restricted  shares or stock units may pay all  withholding
taxes relating to the award with Common Stock rather than cash.

     Options  may  include  nonstatutory  stock  options  ("NSOs")  as  well  as
incentive stock options ("ISOs")  intended to qualify for special tax treatment.
The term of an ISO cannot exceed 10 years, and the exercise price of an ISO must
be equal to or greater than the fair market value of Common Stock on the date of
grant.  The  exercise  price of an NSO must be equal to or greater  than the par
value of the Common Stock on the date of grant.

     The exercise price of an option may be paid in any lawful form permitted by
the Compensation  Committee,  including,  without  limitation,  the surrender of
shares of Common Stock or restricted  shares already owned by the optionee.  The
Compensation   Committee  may  likewise   permit   optionees  to  satisfy  their
withholding  tax obligation upon exercise of an NSO by surrendering a portion of
their option shares to the Company. The 1996 Stock Plan also allows the optionee
to  pay  the  exercise  price  of  an  option  by  giving   "exercise/sale"   or
"exercise/pledge" directions. If exercise/sale directions are given, a number of
option shares  sufficient to pay the exercise price and any withholding taxes is
issued  directly to a  securities  broker  selected by the Company who, in turn,
sells  these  shares in the open  market.  The broker  remits to the Company the
proceeds from the sale of these shares,  and the optionee receives the remaining
option shares.  If  exercise/pledge  directions are given, the option shares are
issued directly to a securities  broker or other lender selected by the Company.
The broker or other  lender  will hold the shares as  security  and will  extend
credit for up to a portion of their market value. The loan proceeds will be paid
to the  Company  to the  extent  necessary  to pay the  exercise  price  and any
withholding taxes. Any excess loan proceeds

                                       18

<PAGE>

may be paid to the optionee.  If the loan proceeds are insufficient to cover the
exercise price and withholding  taxes,  the optionee will be required to pay the
deficiency to the Company at the time of exercise.

     The amount  payable on exercise  of an SAR is  measured  by the  difference
between the market  value of the  underlying  stock at exercise and the exercise
price.  SARs may, but need not, be granted in conjunction  with options.  An SAR
permits  the  participant  to  receive  any  appreciation  in the  value  of the
underlying stock from the Company,  either in shares of Common Stock, in cash or
in a  combination  of the  two,  with  the  Compensation  Committee  having  the
discretion  to  determine  the form in which  such  payment  will be made.  Upon
exercise of an SAR granted in tandem with an option,  the corresponding  portion
of the related  option must be surrendered  and cannot  thereafter be exercised.
Conversely,  upon exercise of an option to which an SAR is attached, the SAR may
no longer be  exercised  to the extent  that the  corresponding  option has been
exercised.  All options  and SARs are  nontransferable  prior to the  optionee's
death.

     As noted above, the Compensation Committee determines the number or size of
restricted shares,  stock units,  options or SARs to be included in any award as
well as vesting  and other  conditions.  Vesting  conditions  may be based on an
employee's service, his or her individual performance, the Company's performance
or other appropriate criteria.  Usually,  vesting conditions will be based on an
employee's  service after the date of grant.  Vesting may be  accelerated in the
event of the  employee's  death,  disability  or retirement or in the event of a
"change in control" with respect to the Company.

     For  purposes of the 1996 Stock Plan,  the term  "change in control"  means
that (i) any person is or becomes the beneficial owner,  directly or indirectly,
of at  least  50% of the  combined  voting  power of the  Company's  outstanding
securities ordinarily having the right to vote in an election of Directors, (ii)
the  stockholders  of the  Company  approve  a  merger,  consolidation  or other
corporate  reorganization and either the Company is not the surviving entity or,
if the Company is the  surviving  entity,  more than 50% of the combined  voting
power  of  the  Company   immediately   after  the  merger,   consolidation   or
reorganization  is owned by persons  who were not  stockholders  of the  Company
immediately  before the  merger,  consolidation  or  reorganization,  or (iii) a
greater than 50% change in the composition of the Board of Directors occurs over
a period of 24 months,  if such  change was not  approved  by a majority  of the
existing Directors.

     Awards  under the 1996  Stock  Plan may  provide  that if any  payment  (or
transfer) by the Company to a recipient  would be  nondeductible  by the Company
for federal  income tax purposes,  then the aggregate  present value of all such
payments (or transfers)  will be reduced to an amount which maximizes such value
without causing any such payment (or transfer) to be nondeductible.

     The Compensation Committee is authorized, within the provisions of the 1996
Stock Plan, to amend the terms of outstanding  restricted shares or stock units,
to modify or extend  outstanding  options or SARs or to exchange new options for
outstanding options,  including outstanding options with a higher exercise price
than the new options.

     Members of the  Company's  Board of Directors  who are not employees of the
Company  at the time of grant are not  eligible  for any  awards  under the 1996
Stock  Plan  other than an annual  grant of an NSO to  acquire  5,000  shares of
Common Stock  (subject to  antidilution  adjustments)  (referred to herein as an
"Annual  Option" - see "Item 1 --  Election  of  Directors  --  Compensation  of
Directors"  above).  Grants of Annual Options are made at the conclusion of each
regular annual meeting of the Company's  stockholders to non-employee  Directors
who will  continue to serve on the Board of Directors  thereafter.  In addition,
all new Directors receive a one-time grant of an NSO to acquire 15,000 shares of
Common Stock on the date they take office (subject to antidilution  adjustments)
(referred  to  herein  as an  "Initial  Option"  - see  "Item 1 --  Election  of
Directors  --  Compensation  of  Directors"  above).  No Director may receive an
Annual  Option in the same  calendar year in which he or she receives an Initial
Option.  The exercise  price of all options  granted to  non-employee  Directors
under the 1996 Stock Plan is equal to the fair market  value of Common  Stock on
the date of grant.  Annual Options become  exercisable  one year after the grant
(or the date of the next annual  meeting of  stockholders,  if  earlier),  while
Initial  Options  are  exercisable  in 12 equal  quarterly  installments  over a
three-year  period  commencing  on the date of grant.  In addition,  all options
granted to non-employee Directors (i) vest in the event of the Director's death,
total and permanent  disability or retirement

                                       19

<PAGE>

after age 65, or in the event of a change in  control of the  Company,  and (ii)
expire ten years after the date of grant, 12 months after the termination of the
Director's  service  due to  disability  or  death  or three  months  after  the
termination of the Director's service for any other reason.

     As of May 15,  1998,  options to acquire  3,128,443  shares had been issued
under  the 1996  Stock  Plan and the  Predecessor  Plans  to  approximately  287
executives,  Directors,  employees,  consultants  and  advisors of the  Company.
Assuming  approval of this proposal,  the total number of shares of Common Stock
reserved for issuance under the 1996 Stock Plan (as amended) and the Predecessor
Plans would be 4,960,465 (subject to anti-dilution  provisions),  reduced by the
number of shares issued or subject to options  outstanding  under the 1996 Stock
Plan and the Predecessor Plans (which numbers were 473,309 shares and options to
acquire 1,900,709 shares,  respectively,  on May 15, 1998, thus making available
2,586,447 shares,  units,  shares underlying  options and/or SARs under the 1996
Stock Plan as of May 15,  1998 if the 1996  Stock  Plan is  amended as  provided
herein). If any restricted shares,  stock units,  options or SARs are forfeited,
or if options or SARs  terminate  for any other reason prior to exercise  (other
than the exercise of a related SAR or option,  and including  any  forfeiture or
termination  under the Predecessor  Plans),  then shares  underlying such awards
again become available for use under the 1996 Stock Plan (for example, as of May
15, 1998, options to acquire 754,425 shares had been canceled without exercise).

     The 1996 Stock Plan may be amended by the Board of  Directors.  Stockholder
approval is only required in those instances where mandated by applicable  laws,
rules and regulations.  Registration Statements on Form S-8 have been filed with
respect to an  aggregate  of  2,960,465  shares of Common  Stock  available  for
issuance under the 1996 Stock Plan. The Company anticipates filing an additional
Registration  Statement  on Form S-8 with  respect to the  additional  2,000,000
shares  which  are the  subject  of the  proposed  increase  promptly  following
approval by the stockholders of this proposal.

Federal Income Tax Consequences

     The following  discussion of certain of the federal income tax consequences
of the 1996  Stock  Plan,  as it  relates  to NSOs,  ISOs and share  awards,  is
intended  to be a  summary  of  applicable  federal  law.  State  and  local tax
consequences may differ.

Options

     ISOs and NSOs are treated differently for federal income tax purposes. ISOs
are  intended to comply  with the  requirements  of Section 422 of the  Internal
Revenue Code of 1986 (the "Code"). NSOs need not comply with such requirements.

     An optionee is not taxed on the grant or exercise of an ISO. The difference
between  the  exercise  price  and the fair  market  value of the  shares on the
exercise  date  will,  however,  be  a  preference  item  for  purposes  of  the
alternative  minimum tax. If an optionee holds the shares acquired upon exercise
of an ISO for at least two years following grant and at least one year following
exercise,  the  optionee's  gain, if any, upon a subsequent  disposition of such
shares is long-term capital gain. Presently,  the maximum long-term capital gain
rate  would be 28% if the  shares  are  held  more  than one year but less  than
eighteen (18) months from the date of exercise or 20% if the shares are held for
more than  eighteen  (18) months from the date of  exercise.  The measure of the
gain is the  difference  between the proceeds  received on  disposition  and the
optionee's basis in the shares (which  generally equals the exercise price).  If
an  optionee  disposes of stock  acquired  pursuant to exercise of an ISO before
satisfying the one and two-year  holding periods  described  above, the optionee
will recognize both ordinary income and capital gain in the year of disposition.
The amount of the ordinary  income will be the lesser of (i) the amount realized
on  disposition  less the  optionee's  adjusted  basis in the stock (usually the
exercise  price) or (ii) the  difference  between the fair  market  value of the
stock  on  the  exercise  date  and  the  exercise  price.  The  balance  of the
consideration  received  on such a  disposition  would  presently  be taxed at a
maximum  long-term  capital  gain  rate of 28% if the stock had been held for at
least one year but less than eighteen (18) months following exercise of the ISO.
The balance of the consideration  received would presently be taxed at a maximum
long-term  capital  gain  rate of 20% if the  stock  had been  held for at least
eighteen (18) months following  exercise of the ISO. The Company is not entitled
to an  income  tax  deduction  on  the  grant  or  exercise  of an ISO or on the
optionee's  disposition  of the

                                       20

<PAGE>

underlying  shares after  satisfying  the holding period  requirement  described
above. If the holding periods are not satisfied, the Company will be entitled to
a deduction in the year the  optionee  disposes of the shares in an amount equal
to the ordinary income recognized by the optionee.

     An optionee is not taxed on the grant of an NSO. On exercise,  however, the
optionee recognizes ordinary income equal to the difference between the exercise
price  and the  fair  market  value  of the  underlying  shares  on the  date of
exercise.  The  Company is entitled  to an income tax  deduction  in the year of
exercise  in the amount  recognized  by the  optionee as  ordinary  income.  The
Company is responsible  for wage  withholding on the income  recognized and will
not transfer the shares on exercise until appropriate arrangements are made with
the participant to satisfy the Company's  withholding  obligations.  Any gain on
subsequent  disposition  of the  shares  would be taxed at a  maximum  long-term
capital  gain rate of 28% if the  shares are held for at least one year but less
than eighteen (18) months following exercise. Any gain on subsequent disposition
would be taxed at a maximum long-term capital gain rate of 20% if the shares are
held for at least eighteen (18) months following exercise.  The Company does not
receive a deduction for this gain.

Share Awards

     If a participant  is awarded or purchases  shares,  the amount by which the
fair  market  value of the shares on the date of award or  purchase  exceeds the
amount paid for the shares will be taxed to the participant as ordinary  income.
The Company is  entitled  to a  corresponding  deduction.  Also,  the Company is
responsible for wage withholding on the income  recognized and will not transfer
shares until  appropriate  arrangements are made with the participant to satisfy
the Company's withholding obligations. The participant's tax basis in the shares
acquired  is  equal  to the  fair  market  value  of the  shares  on the date of
acquisition.  Upon a subsequent sale of any shares, the participant will realize
capital gain or loss (long-term or short-term,  depending on how long the shares
have been held - see discussion  under  "Options" above for differences in rates
based upon whether or not the participant  satisfies the one-year holding period
but not the eighteen-month  holding period) in an amount equal to the difference
between his or her basis in the shares and the sale price.

     If a  participant  is awarded or  purchases  shares  that are  subject to a
vesting  schedule,  the  participant  is deemed to receive an amount of ordinary
income  equal to the excess of the fair  market  value of the shares at the time
they vest over the amount (if any) paid for such shares by the participant.  The
Company is entitled to a deduction equal to the amount of the income  recognized
by the participant.  However, Code Section 83(b) permits a participant to elect,
within 30 days  after the  transfer  to him or her of any  shares  subject  to a
vesting schedule, to be taxed at ordinary income rates on the excess of the fair
market value of the shares at the time of the transfer  over the amount (if any)
paid by the  participant  for such shares.  If the  participant  makes a Section
83(b) election,  any later  appreciation in the value of the shares is not taxed
as ordinary  income,  but  instead is taxed as capital  gain when the shares are
sold or transferred (again, see discussion under "Options" above for differences
in  capital  gains  rates).  Once  again,  the  participant  must make  suitable
arrangements  with the Company so that the Company may meet its wage withholding
obligations at the time the  participant  recognizes  ordinary  income  (whether
because  of  the  Section  83(b)  election  or  the   satisfaction   of  vesting
requirements).

Recommendation of the Board of Directors

THE BOARD OF  DIRECTORS  RECOMMENDS  A VOTE "FOR" THE  PROPOSAL TO INCREASE  THE
NUMBER OF SHARES OF COMMON STOCK AVAILABLE FOR ISSUANCE UNDER THE COMPANY'S 1996
STOCK PLAN AND TO APPROVE SUCH PLAN AS AMENDED AND RESTATED.


                                       21

<PAGE>

       ITEM 3 - PROPOSAL TO INCREASE THE NUMBER OF SHARES AVAILABLE UNDER
                      THE 1996 EMPLOYEE STOCK PURCHASE PLAN

     The Company has adopted,  and presently  utilizes,  a 1996  Employee  Stock
Purchase Plan under which 100,000  shares of Common Stock have been reserved for
issuance by direct sale to participating  eligible  employees of the Company and
its subsidiary.  As of May 11, 1998, the Board of Directors amended and restated
the 1996 Employee Stock  Purchase Plan (as amended and restated,  the "ESPP") to
reserve an  additional  150,000  shares of Common Stock for  issuance  under the
ESPP,  subject  to the  approval  of the  Company's  stockholders  at the Annual
Meeting. A copy of the ESPP is attached hereto as Appendix B.

The ESPP

     The ESPP was  originally  adopted by the Board of  Directors on February 7,
1996  and  approved  by the  Company's  stockholders  in  March  1996,  becoming
effective upon the  consummation  of the Company's  initial  public  offering in
April 1996.

     The ESPP is  administered  by the  Compensation  Committee  of the Board of
Directors.  The purpose of the ESPP is to give eligible employees an opportunity
to purchase  shares of the Common Stock of the Company  ("shares") at a discount
and to pay for their purchases through payroll  deductions.  The ESPP is open to
eligible employees of the Company and its subsidiary (ChromaXome Corp.). Members
of the Company's Board of Directors who are not employees of the Company are not
eligible to participate in the ESPP. As of May 15, 1998, there were 42 employees
of the  Company  and its  subsidiary  participating  in the ESPP for the  period
ending June 30, 1998.

     The ESPP provides for two  "participation  periods" in each calendar  year,
consisting of the first half of the year and the second half of the year. At the
beginning of each  participation  period,  eligible  employees who enroll in the
ESPP indicate,  subject to ESPP limitations,  the amount they wish to contribute
per  pay  period.  All  employee   contributions  that  are  withheld  during  a
participation  period are allowed to accumulate until the end of the period.  On
the last day of each participation period, each participant's  contributions are
automatically used to purchase shares, subject to ESPP limitations, at the lower
of 85% of (i) the  market  price of shares on the last  trading  day  before the
participation  period  starts or (ii) the market price of the shares on the last
trading day in the participation period.

     Eligible  employees  may  elect  to  contribute  up to  10% of  their  cash
compensation  under the ESPP. No participant may purchase more than 2,500 shares
per  purchase  period,  and the value of the Common  Stock  purchased  each year
(measured at the beginning of the purchase  periods) may not exceed  $25,000 per
participant.  Participants  may withdraw their  contributions at any time before
the close of the purchase period.

     As noted above,  the Compensation  Committee  determines the guidelines and
forms for the  implementation  and  administration  of the ESPP,  interprets the
provisions of the ESPP and makes all other substantive  decisions  regarding the
operation of the ESPP.  As of May 15,  1998,  a total of 47,686  shares had been
issued  under the ESPP to  approximately  44 eligible  employees of the Company.
Assuming  approval of this proposal,  the total number of shares of Common Stock
reserved for issuance under the ESPP (as amended)  would be 250,000,  reduced by
the number of shares  issued  under the ESPP (which  numbers were 30,581 in 1997
and 17,105 in 1998, thus making 202,314 shares  available for issuance under the
ESPP as of May 15, 1998, if the ESPP is amended as provided herein).

     The Compensation  Committee may amend, suspend or terminate the ESPP at any
time  and  for any  reason.  Stockholder  approval  is only  required  in  those
instances  where  mandated  by  applicable  laws,   rules  and  regulations.   A
Registration Statement on Form S-8 has been filed with respect to 100,000 shares
of Common Stock  available for issuance under the ESPP. The Company  anticipates
filing an  additional  Registration  Statement  on Form S-8 with  respect to the
additional  150,000  shares  which  are the  subject  of the  proposed  increase
promptly following approval by the stockholders of this proposal.

                                       22

<PAGE>

Federal Income Tax Consequences

     The following  discussion of certain of the federal income tax consequences
of the ESPP, as it relates to shares,  is intended to be a summary of applicable
federal law. State and local tax consequences may differ.

     The ESPP is intended to qualify as an "employee  stock purchase plan" under
section 423 of the Internal  Revenue Code (the "Code").  No income is recognized
by a participant at the time a right to purchase shares is granted. Likewise, no
taxable income is recognized at the time of the purchase of shares,  even though
the purchase  price  reflects a discount  from the market price of the shares at
that time.  If a  participant  holds the shares  acquired  under the ESPP for at
least two years following the beginning of the applicable  participation period,
(a) the amount of ordinary income recognized,  upon a subsequent  disposition of
such  shares,  is the lesser of (i) the excess of the fair  market  value of the
shares on the date of disposition  over the actual purchase price or (ii) 15% of
the market value of the shares immediately  before the applicable  participation
period,  and (b) the  participant's  further  gain,  if any,  on such  shares is
long-term capital gain (taxed at a maximum rate of 20% under the presumption the
shares are also held for at least eighteen (18) months following  acquisition of
the shares under the ESPP).  The measure of the capital  gain is the  difference
between the proceeds received on disposition and the participant's  basis in the
shares (which generally equals the purchase price under the ESPP plus the amount
of ordinary  income  recognized).  If a participant  disposes of stock  acquired
pursuant to the ESPP before  satisfying the two-year  holding  period  described
above, the participant will recognize  ordinary income for the entire difference
between the participant's  original purchase price under the ESPP and the market
value of the shares on the date of the  original  purchase  under the ESPP.  The
balance of the  consideration  received on such a disposition will be taxed as a
capital  gain.  The gain will be long or  short-term  depending  on how long the
participant  holds  the  shares.  If the  shares  are held for at least one year
following  acquisition of the shares under the ESPP, the gain would presently be
taxed at a maximum capital gain rate of 28%. If the shares are held for at least
eighteen (18) months  following  acquisition  of the shares under the ESPP,  the
gain would presently be taxed at a maximum capital gain rate of 20%. The Company
is not  entitled  to an income tax  deduction  on the date of  purchase  of such
shares or on the  participant's  disposition of the shares after  satisfying the
holding  period  requirement  described  above.  If the  holding  period  is not
satisfied,  the  Company  will  be  entitled  to a  deduction  in the  year  the
participant  disposes of the shares in an amount  equal to the  ordinary  income
recognized by the participant.

Recommendation of the Board of Directors

THE BOARD OF  DIRECTORS  RECOMMENDS  A VOTE "FOR" THE  PROPOSAL TO INCREASE  THE
NUMBER OF SHARES OF COMMON STOCK AVAILABLE FOR ISSUANCE UNDER THE COMPANY'S 1996
EMPLOYEE STOCK PURCHASE PLAN.



                                       23

<PAGE>

                  ITEM 4 - RATIFICATION OF INDEPENDENT AUDITORS

     The Board of Directors  has  appointed the firm of Ernst & Young LLP as the
Company's  independent  auditors  for the fiscal year ending  December 31, 1998,
subject to ratification by the  stockholders.  Ernst & Young LLP has audited the
Company's financial statements since the Company's inception. Representatives of
Ernst & Young  LLP are  expected  to be  present  at the  Annual  Meeting.  Such
representatives will have an opportunity to make a statement,  if they desire to
do so, and are expected to be available to respond to appropriate questions.

     In the event  ratification  is not  provided,  the Board of Directors  will
review its future selection of the Company's independent auditors.

THE BOARD OF DIRECTORS RECOMMENDS A VOTE "FOR" RATIFICATION OF ERNST & YOUNG LLP
AS THE COMPANY'S INDEPENDENT AUDITORS.


                STOCKHOLDER PROPOSALS FOR THE 1998 ANNUAL MEETING

     Proposals of  stockholders of the Company that are intended to be presented
by such  stockholders  at the Company's  1999 Annual Meeting must be received by
the  Secretary of the Company no later than March 8, 1999 in order that they may
be included in the Company's  proxy statement and form of proxy relating to that
meeting.


                   ANNUAL REPORT AND AVAILABILITY OF FORM 10-K

     The Company's  1997 Annual Report to  Stockholders  accompanies  this Proxy
Statement.  The Company's  Annual  Report on Form 10-K for 1997,  which has been
filed  with  the  Securities  and  Exchange  Commission,  will  be  provided  to
stockholders  of the  Company,  without  charge,  upon  written  request to Noel
Wheeler,  Office of the Secretary,  Trega  Biosciences,  Inc., 9880 Campus Point
Drive, San Diego, California 92121.


                                  OTHER MATTERS

     The Company knows of no other business that will be presented at the Annual
Meeting. If any other business is properly brought before the Annual Meeting, it
is intended that proxies in the enclosed  form will be voted in accordance  with
the judgment of the persons voting the proxies.

     Whether you intend to be present at the Annual  Meeting or not, we urge you
to return your signed proxy promptly.


                                            By order of the Board of Directors,
                                             
                                            /s/ Robert S. Whitehead
 
                                            Robert S. Whitehead
                                            Chairman and Chief Executive Officer

                                       24

<PAGE>

                                   APPENDIX A


                          1996 STOCK INCENTIVE PLAN OF
                             TREGA BIOSCIENCES, INC.


     ARTICLE 1. INTRODUCTION.


     The Plan was  adopted by the Board on February  7, 1996,  and  subsequently
approved by the Company's  stockholders  in March 1996. An amendment to Sections
4.2(b)  and  4.2(c)  of the  Plan was  approved  by the  Board on May 11,  1998.
Amendments  to Section 5.2 and 7.2 of the Plan were  approved by the Board as of
June 29, 1998. An increase by 1,100,000 in the number of Common Shares available
was approved by the Board of Directors as of April 22, 1997 and became effective
upon  stockholder  approval on June 11,  1997.  An increase by  2,000,000 in the
number of Common  Shares  available  under the Plan was approved by the Board of
Directors as of May 11, 1998 (to be effective upon  stockholder  approval).  The
Plan became  effective as of the date of the Company's  initial public offering.
The Plan replaced the 1992 Stock Plan of Houghten Pharmaceuticals,  Inc. and the
1995 Stock Plan of Houghten Pharmaceuticals, Inc.


     The purpose of the Plan is to promote the long-term  success of the Company
and the creation of stockholder  value by (a) encouraging Key Employees to focus
on critical long-range objectives,  (b) encouraging the attraction and retention
of Key Employees with exceptional  qualifications  and (c) linking Key Employees
directly to stockholder  interests through  increased stock ownership.  The Plan
seeks to achieve this purpose by providing  for Awards in the form of Restricted
Shares,  Stock Units,  Options (which may constitute  incentive stock options or
nonstatutory stock options) or stock appreciation rights.

     The Plan shall be governed by, and construed in accordance  with,  the laws
of the State of Delaware (except their choice-of-law provisions).

     ARTICLE 2. ADMINISTRATION.

     2.1 Committee Composition. The Plan shall be administered by the Committee.
The Committee shall consist  exclusively of directors of the Company,  who shall
be appointed by the Board.  In addition,  the composition of the Committee shall
satisfy:

          (a) Such  requirements  as the Securities and Exchange  Commission may
     establish for  adminis-trators  acting under plans  intended to qualify for
     exemption under Rule 16b-3 (or its successor) under the Exchange Act; and

          (b) Such  requirements  as the Internal  Revenue Service may establish
     for outside  directors acting under plans intended to qualify for exemption
     under section 162(m)(4)(C) of the Code.

The Board may also appoint one or more separate  committees  of the Board,  each
composed  of one or more  directors  of the  Company  who need not  satisfy  the
foregoing  requirements,  who  may  administer  the  Plan  with  respect  to Key
Employees  who are not  considered  officers or directors  of the Company  under
section 16 of the  Exchange  Act,  may grant  Awards  under the Plan to such Key
Employees and may determine all terms of such Awards.

     2.2  Committee  Responsibilities.  The  Committee  shall (a) select the Key
Employees  who are to receive  Awards under the Plan,  (b)  determine  the type,
number,  vesting  requirements and other features and conditions of such Awards,
(c)  interpret  the  Plan  and (d)  make all  other  decisions  relating  to the
operation of the Plan.  The  Committee  may adopt such rules or guidelines as it
deems  appropriate to implement the Plan. The Committee's  determinations  under
the Plan shall be final and binding on all persons.

     ARTICLE 3. SHARES AVAILABLE FOR GRANTS.

     3.1 Basic  Limitation.  Common  Shares  issued  pursuant to the Plan may be
authorized  but unissued  shares or treasury  shares.  The  aggregate  number of
Restricted  Shares,  Stock Units,  Options and SARs awarded


                                      A-1

<PAGE>

under the Plan shall not exceed 4,960,465 minus the number of Common Shares that
have been issued or are subject to option  under the 1992 Stock Plan of Houghten
Pharmaceuticals,  Inc. or the 1995 Stock Plan of Houghten Pharmaceuticals,  Inc.
The  limitation of this Section 3.1 shall be subject to  adjustment  pursuant to
Article 10.

     3.2 Additional Shares. If Stock Units,  Options or SARs are forfeited or if
Options or SARs terminate for any other reason before being exercised,  then the
corresponding  Common  Shares shall again become  available for Awards under the
Plan. If Restricted  Shares are  forfeited  before any dividends  have been paid
with respect to such Shares,  then such Shares shall again become  available for
Awards  under the Plan.  If Stock  Units are  settled,  then only the  number of
Common Shares (if any)  actually  issued in settlement of such Stock Units shall
reduce the number available under Section 3.1 and the balance shall again become
available for Awards under the Plan. If SARs are exercised, then only the number
of Common  Shares  (if any)  actually  issued in  settlement  of such SARs shall
reduce the number available under Section 3.1 and the balance shall again become
available for Awards under the Plan.

     3.3 Dividend  Equivalents.  Any dividend equivalents  distributed under the
Plan shall not be applied against the number of Restricted Shares,  Stock Units,
Options or SARs available for Awards,  whether or not such dividend  equivalents
are converted into Stock Units.

     ARTICLE 4. ELIGIBILITY.

     4.1 General  Rules.  Only Key  Employees  (including,  without  limitation,
independent  contractors who are not members of the Board) shall be eligible for
designation  as  Participants  by the  Committee.  Key Employees who are Outside
Directors  shall only be eligible for the grant of the NSOs described in Section
4.2 and for making an election described in Article 12.

     4.2 Outside Directors. Any other provision of the Plan notwithstanding, the
participation of Outside Directors in the Plan shall be subject to the following
conditions:

          (a) Outside  Directors  shall receive no Awards except as described in
     this Section 4.2 and Article 12.

          (b) Each  Outside  Director  who  first  becomes a member of the Board
     after the date of the Company's  initial  public  offering  shall receive a
     one-time  grant  of an  NSO  covering  15,000  Common  Shares  (subject  to
     adjustment  under  Article 10).  Such NSO shall be granted on the date when
     such Outside Director first joins the Board and shall become exercisable in
     12 equal  installments  at three-month  intervals over the 36-month  period
     commencing on the date of grant.

          (c)  Upon  the  conclusion  of  each  regular  annual  meeting  of the
     Company's  stockholders  held in the year 1998 or thereafter,  each Outside
     Director  who will  continue  serving  as a member of the Board  thereafter
     shall receive an NSO covering  5,000 Shares  (subject to  adjustment  under
     Article 10), except that such NSO shall not be granted in the calendar year
     in which the same Outside Director received the NSO described in Subsection
     (b) above.  NSOs granted under the first  sentence of this  Subsection  (c)
     shall become  exercisable  in full on the first  anniversary of the date of
     grant.

          (d) All NSOs  granted to an Outside  Director  under this  Section 4.2
     shall also become  exercisable in full in the event of (i) the  termination
     of such Outside  Director's  service because of death,  total and permanent
     disability  or  retirement  at or after age 65 or (ii) a Change in  Control
     with respect to the Company.

          (e) The Exercise  Price under all NSOs granted to an Outside  Director
     under this Section 4.2 shall be equal to 100% of the Fair Market Value of a
     Common Share on the date of grant, payable in one of the forms described in
     Sections 6.1, 6.2, 6.3 and 6.4.

          (f) All NSOs  granted to an Outside  Director  under this  Section 4.2
     shall terminate on the earliest of (i) the 10th  anniversary of the date of
     grant,  (ii) the date three  months after the  termination  of such Outside
     Director's  service for any reason other than death or total and  permanent
     disability  or (iii)  the date


                                      A-2
<PAGE>

     12 months after the termination of such Outside  Director's service because
     of death or total and permanent disability.

The  Committee may provide that the NSOs that  otherwise  would be granted to an
Outside Director under this Section 4.2 shall instead be granted to an affiliate
of such Outside  Director.  Such affiliate shall then be deemed to be an Outside
Director for purposes of the Plan, provided that the service-related vesting and
termination  provisions  pertaining  to the NSOs shall be applied with regard to
the service of the Outside Director.

     4.3  Incentive  Stock  Options.  Only  Key  Employees  who  are  common-law
employees  of the Company,  a Parent or a  Subsidiary  shall be eligible for the
grant of ISOs.  In addition,  a Key Employee who owns more than 10% of the total
combined voting power of all classes of outstanding  stock of the Company or any
of its Parents or  Subsidiaries  shall not be  eligible  for the grant of an ISO
unless  the  requirements  set  forth  in  section  422(c)(6)  of the  Code  are
satisfied.

     ARTICLE 5. OPTIONS.

     5.1 Stock Option Agreement. Each grant of an Option under the Plan shall be
evidenced by a Stock Option Agreement between the Optionee and the Company. Such
Option shall be subject to all  applicable  terms of the Plan and may be subject
to any other terms that are not  inconsistent  with the Plan.  The Stock  Option
Agreement  shall specify  whether the Option is an ISO or an NSO. The provisions
of the various Stock Option  Agreements  entered into under the Plan need not be
identical.  Options  may be granted  in  consideration  of a cash  payment or in
consideration  of a reduction  in the  Optionee's  other  compensation.  A Stock
Option Agreement may provide that a new Option will be granted  automatically to
the Optionee when he or she exercises a prior Option and pays the Exercise Price
in the form described in Section 6.2.

     5.2 Number of Shares.  Each Stock Option Agreement shall specify the number
of Common Shares  subject to the Option and shall provide for the  adjustment of
such number in accordance  with Article 10. Options granted to any Optionee in a
single  calendar year shall in no event cover more than 450,000  Common  Shares,
subject to adjustment in accordance with Article 10.

     5.3 Exercise Price.  Each Stock Option Agreement shall specify the Exercise
Price;  provided that the Exercise  Price under an ISO shall in no event be less
than 100% of the Fair  Market  Value of a Common  Share on the date of grant and
the Exercise  Price under an NSO shall in no event be less than the par value of
the Common  Shares  subject to such NSO.  In the case of an NSO, a Stock  Option
Agreement  may  specify an  Exercise  Price  that  varies in  accordance  with a
predetermined formula while the NSO is outstanding.

     5.4  Exercisability and Term. Each Stock Option Agreement shall specify the
date when all or any  installment  of the Option is to become  exercisable.  The
Stock Option Agreement shall also specify the term of the Option;  provided that
the term of an ISO shall in no event  exceed 10 years from the date of grant.  A
Stock Option Agreement may provide for accelerated  exercisability  in the event
of the  Optionee's  death,  disability  or  retirement  or other  events and may
provide  for  expiration  prior  to the  end of its  term  in the  event  of the
termination  of the  Optionee's  service.  Options may be awarded in combination
with  SARs,  and  such an  Award  may  provide  that  the  Options  will  not be
exercisable  unless the related SARs are forfeited.  NSOs may also be awarded in
combination with Restricted Shares or Stock Units, and such an Award may provide
that the NSOs will not be exercisable  unless the related  Restricted  Shares or
Stock Units are forfeited.

     5.5 Effect of Change in Control.  The Committee may determine,  at the time
of  granting  an Option or  thereafter,  that such  Option  shall  become  fully
exercisable  as to all Common Shares  subject to such Option in the event that a
Change in Control occurs with respect to the Company.

     5.6  Modification  or Assumption of Options.  Within the limitations of the
Plan,  the Committee  may modify,  extend or assume  outstanding  options or may
accept the  cancellation of outstanding  options (whether granted by the Company
or by another  issuer) in return for the grant of new  options for the same or a
different  number of shares and at the same or a different  exercise price.  The
foregoing  notwithstanding,  no  modification  of an Option  shall,  without the
consent of the Optionee,  alter or impair his or her rights or obligations under
such Option.



                                      A-3

<PAGE>

     ARTICLE 6. PAYMENT FOR OPTION SHARES.

     6.1 General Rule.  The entire  Exercise  Price of Common Shares issued upon
exercise of Options shall be payable in cash at the time when such Common Shares
are purchased, except as follows:

          (a) In the case of an ISO  granted  under the Plan,  payment  shall be
     made only pursuant to the express provisions of the applicable Stock Option
     Agreement.  The Stock Option Agreement may specify that payment may be made
     in any form(s) described in this Article 6.

          (b) In the  case of an  NSO,  the  Committee  may at any  time  accept
     payment in any form(s) described in this Article 6.

     6.2 Surrender of Stock.  To the extent that this Section 6.2 is applicable,
payment for all or any part of the Exercise Price may be made with Common Shares
which have already  been owned by the  Optionee  for more than six months.  Such
Common  Shares  shall be valued at their Fair Market  Value on the date when the
new Common Shares are purchased under the Plan.

     6.3  Exercise/Sale.  To the extent  that this  Section  6.3 is  applicable,
payment may be made by the delivery (on a form  prescribed by the Company) of an
irrevocable  direction  to a securities  broker  approved by the Company to sell
Common Shares and to deliver all or part of the sales proceeds to the Company in
payment of all or part of the Exercise Price and any withholding taxes.

     6.4  Exercise/Pledge.  To the extent that this  Section 6.4 is  applicable,
payment may be made by the delivery (on a form  prescribed by the Company) of an
irrevocable  direction to pledge Common Shares to a securities  broker or lender
approved by the Company,  as security for a loan,  and to deliver all or part of
the loan proceeds to the Company in payment of all or part of the Exercise Price
and any withholding taxes.

     6.5  Promissory  Note.  To the extent that this Section 6.5 is  applicable,
payment may be made with a full-recourse  promissory note; provided that the par
value of the Common Shares shall be paid in cash.

     6.6  Other  Forms of  Payment.  To the  extent  that  this  Section  6.6 is
applicable,  payment  may be made in any  other  form  that is  consistent  with
applicable laws, regulations and rules.

     ARTICLE 7. STOCK APPRECIATION RIGHTS.

     7.1 SAR  Agreement.  Each grant of an SAR under the Plan shall be evidenced
by an SAR  Agreement  between the Optionee  and the  Company.  Such SAR shall be
subject  to all  applicable  terms of the Plan and may be  subject  to any other
terms that are not inconsistent with the Plan. The provisions of the various SAR
Agreements  entered  into  under  the Plan  need not be  identical.  SARs may be
granted in consideration of a reduction in the Optionee's other compensation.

     7.2 Number of Shares. Each SAR Agreement shall specify the number of Common
Shares to which the SAR pertains and shall  provide for the  adjustment  of such
number in  accordance  with Article 10. SARs granted to any Optionee in a single
calendar  year shall in no event  pertain to more than  450,000  Common  Shares,
subject to adjustment in accordance with Article 10.

     7.3 Exercise Price. Each SAR Agreement shall specify the Exercise Price. An
SAR  Agreement may specify an Exercise  Price that varies in  accordance  with a
predetermined formula while the SAR is outstanding.

     7.4 Exercisability and Term. Each SAR Agreement shall specify the date when
all or any  installment of the SAR is to become  exercisable.  The SAR Agreement
shall  also  specify  the term of the SAR.  An SAR  Agreement  may  provide  for
accelerated  exercisability in the event of the Optionee's death,  disability or
retirement  or other events and may provide for  expiration  prior to the end of
its term in the event of the  termination  of the Optionee's  service.  SARs may
also be awarded in combination with Options,  Restricted  Shares or Stock Units,
and such an Award may provide that the SARs will not be  exercisable  unless the
related Options,  Restricted Shares or 


                                      A-4

<PAGE>

Stock Units are forfeited.  An SAR may be included in an ISO only at the time of
grant but may be included in an NSO at the time of grant or  thereafter.  An SAR
granted under the Plan may provide that it will be exercisable only in the event
of a Change in Control.

     7.5 Effect of Change in Control.  The Committee may determine,  at the time
of granting an SAR or thereafter,  that such SAR shall become fully  exercisable
as to all  Common  Shares  subject  to such SAR in the  event  that a Change  in
Control occurs with respect to the Company.

     7.6  Exercise  of SARs.  The  exercise  of an SAR shall be  subject  to the
restrictions imposed by Rule 16b-3 (or its successor) under the Exchange Act, if
applicable.  If, on the date when an SAR expires,  the Exercise Price under such
SAR is less than the Fair Market  Value on such date but any portion of such SAR
has not been  exercised or  surrendered,  then such SAR shall  automatically  be
deemed to be  exercised  as of such  date with  respect  to such  portion.  Upon
exercise of an SAR, the Optionee (or any person having the right to exercise the
SAR after his or her death) shall  receive  from the Company (a) Common  Shares,
(b) cash or (c) a combination of Common Shares and cash, as the Committee  shall
determine.  The amount of cash  and/or the Fair  Market  Value of Common  Shares
received upon exercise of SARs shall,  in the aggregate,  be equal to the amount
by which the Fair Market Value (on the date of  surrender)  of the Common Shares
subject to the SARs exceeds the Exercise Price.

     7.7 Modification or Assumption of SARs. Within the limitations of the Plan,
the Committee may modify,  extend or assume  outstanding  SARs or may accept the
cancellation of outstanding  SARs (whether  granted by the Company or by another
issuer) in return for the grant of new SARs for the same or a  different  number
of  shares  and at  the  same  or a  different  exercise  price.  The  foregoing
notwithstanding,  no  modification  of an SAR shall,  without the consent of the
Optionee, alter or impair his or her rights or obligations under such SAR.

     ARTICLE 8. RESTRICTED SHARES AND STOCK UNITS.

     8.1 Time,  Amount and Form of Awards.  Awards under the Plan may be granted
in the  form of  Restricted  Shares,  in the  form  of  Stock  Units,  or in any
combination  of both.  Restricted  Shares or Stock  Units may also be awarded in
combination with NSOs or SARs, and such an Award may provide that the Restricted
Shares or Stock Units will be  forfeited  in the event that the related  NSOs or
SARs are exercised.

     8.2 Payment for Awards.  To the extent that an Award is granted in the form
of newly issued Restricted  Shares,  the Award recipient,  as a condition to the
grant of such  Award,  shall be  required  to pay the  Company in cash an amount
equal to the par value of such Restricted Shares. To the extent that an Award is
granted in the form of Restricted  Shares from the Company's  treasury or in the
form of Stock  Units,  no cash  consideration  shall be  required  of the  Award
recipients.

     8.3  Vesting  Conditions.  Each Award of  Restricted  Shares or Stock Units
shall  become  vested,  in full or in  installments,  upon  satisfaction  of the
conditions  specified in the Stock Award Agreement.  A Stock Award Agreement may
provide  for  accelerated  vesting  in the  event  of the  Participant's  death,
disability or retirement or other events.  The Committee may  determine,  at the
time of making an Award or thereafter, that such Award shall become fully vested
in the event that a Change in Control occurs with respect to the Company.

     8.4 Form and Time of Settlement of Stock Units.  Settlement of vested Stock
Units  may be made  in the  form  of (a)  cash,  (b)  Common  Shares  or (c) any
combination of both, as determined by the Committee.  The actual number of Stock
Units eligible for settlement may be larger or smaller than the number  included
in the original Award, based on predetermined  performance  factors.  Methods of
converting Stock Units into cash may include (without limitation) a method based
on the average Fair Market Value of Common Shares over a series of trading days.
Vested  Stock  Units  may be  settled  in a lump  sum  or in  installments.  The
distribution may occur or commence when all vesting conditions applicable to the
Stock Units have been  satisfied  or have  lapsed,  or it may be deferred to any
later  date.  The  amount of a  deferred  distribution  may be  increased  by an
interest  factor or by  dividend  equivalents.  Until an Award of Stock Units is
settled,  the number of such Stock Units shall be subject to adjustment pursuant
to Article 10.

     8.5 Death of  Recipient.  Any Stock Units Award that becomes  payable after
the  recipient's  death shall be distributed to the  recipient's  beneficiary or
beneficiaries.  Each  recipient  of a Stock  Units  Award  under the Plan  shall
designate one or more  beneficiaries  for this purpose by filing the  prescribed
form with the Company.  A


                                      A-5
<PAGE>

beneficiary  designation  may be changed by filing the prescribed  form with the
Company at any time before the Award  recipient's  death.  If no beneficiary was
designated or if no designated  beneficiary  survives the Award recipient,  then
any Stock Units Award that becomes payable after the recipient's  death shall be
distributed to the recipient's estate.

     8.6 Creditors'  Rights.  A holder of Stock Units shall have no rights other
than those of a general  creditor  of the  Company.  Stock  Units  represent  an
unfunded  and  unsecured  obligation  of the  Company,  subject to the terms and
conditions of the applicable Stock Award Agreement.

     ARTICLE 9. VOTING AND DIVIDEND RIGHTS.

     9.1 Restricted  Shares.  The holders of Restricted Shares awarded under the
Plan shall have the same  voting,  dividend  and other  rights as the  Company's
other  stockholders.  A Stock Award  Agreement,  however,  may require  that the
holders of Restricted  Shares invest any cash  dividends  received in additional
Restricted  Shares.  Such additional  Restricted  Shares shall be subject to the
same  conditions  and  restrictions  as the  Award  with  respect  to which  the
dividends  were paid.  Such  additional  Restricted  Shares shall not reduce the
number of Common Shares available under Article 3.

     9.2 Stock  Units.  The holders of Stock Units shall have no voting  rights.
Prior to settlement or forfeiture, any Stock Unit awarded under the Plan may, at
the Committee's discretion, carry with it a right to dividend equivalents.  Such
right  entitles  the  holder to be  credited  with an  amount  equal to all cash
dividends paid on one Common Share while the Stock Unit is outstanding. Dividend
equivalents may be converted into additional Stock Units. Settlement of dividend
equivalents may be made in the form of cash, in the form of Common Shares, or in
a combination of both. Prior to distribution, any dividend equivalents which are
not paid shall be subject to the same  conditions and  restrictions as the Stock
Units to which they attach.

     ARTICLE 10. PROTECTION AGAINST DILUTION.

     10.1 Adjustments.  In the event of a subdivision of the outstanding  Common
Shares, a declaration of a dividend payable in Common Shares, a declaration of a
dividend  payable  in a form other than  Common  Shares in an amount  that has a
material effect on the price of Common Shares, a combination or consolidation of
the outstanding Common Shares (by  reclassification  or otherwise) into a lesser
number of Common Shares, a recapitalization,  a spinoff or a similar occurrence,
the Committee shall make such adjustments as it, in its sole  discretion,  deems
appropriate in one or more of (a) the number of Options, SARs, Restricted Shares
and Stock Units available for future Awards under Article 3, (b) the limitations
set forth in  Sections  5.2 and 7.2,  (c) the  number of NSOs to be  granted  to
Outside  Directors  under Section 4.2, (d) the number of Stock Units included in
any prior Award which has not yet been settled,  (e) the number of Common Shares
covered by each outstanding  Option and SAR or (f) the Exercise Price under each
outstanding Option and SAR. Except as provided in this Article 10, a Participant
shall have no rights by reason of any issue by the Company of stock of any class
or  securities   convertible  into  stock  of  any  class,  any  subdivision  or
consolidation of shares of stock of any class, the payment of any stock dividend
or any other increase or decrease in the number of shares of stock of any class.

     10.2 Reorganizations.  In the event that the Company is a party to a merger
or other reorganization,  outstanding Options, SARs, Restricted Shares and Stock
Units  shall be  subject  to the  agreement  of merger or  reorganization.  Such
agreement may provide,  without  limitation,  for the  assumption of outstanding
Awards by the surviving corporation or its parent, for their continuation by the
Company (if the Company is a surviving corporation), for accelerated vesting and
accelerated expiration, or for settlement in cash.

     ARTICLE 11. AWARDS UNDER OTHER PLANS.

     The Company may grant awards under other plans or programs. Such awards may
be settled in the form of Common  Shares  issued  under this Plan.  Such  Common
Shares  shall be treated  for all  purposes  under the Plan like  Common  Shares
issued in settlement of Stock Units and shall, when issued, reduce the number of
Common Shares available under Article 3.



                                      A-6

<PAGE>

     ARTICLE 12. PAYMENT OF DIRECTOR'S FEES IN SECURITIES.

     12.1  Effective  Date.  No  provision of this Article 12 shall be effective
unless and until the Board has determined to implement such provision.

     12.2  Elections  to Receive  NSOs,  Restricted  Shares or Stock  Units.  An
Outside  Director may elect to receive his or her annual  retainer  payments and
meeting  fees from the  Company in the form of cash,  NSOs,  Restricted  Shares,
Stock Units, or a combination  thereof,  as determined by the Board.  Such NSOs,
Restricted  Shares and Stock Units shall be issued  under the Plan.  An election
under this Article 12 shall be filed with the Company on the prescribed form.

     12.3 Number and Terms of NSOs, Restricted Shares or Stock Units. The number
of NSOs,  Restricted Shares or Stock Units to be granted to Outside Directors in
lieu of annual  retainers and meeting fees that would  otherwise be paid in cash
shall be calculated in a manner determined by the Board. The terms of such NSOs,
Restricted Shares or Stock Units shall also be determined by the Board.

     ARTICLE 13. LIMITATION ON RIGHTS.

     13.1  Retention  Rights.  Neither the Plan nor any Award  granted under the
Plan  shall be deemed  to give any  individual  a right to  remain an  employee,
consultant or director of the Company, a Parent or a Subsidiary. The Company and
its Parents and  Subsidiaries  reserve the right to terminate the service of any
employee,  consultant or director at any time, with or without cause, subject to
applicable laws, the Company's  certificate of  incorporation  and by-laws and a
written employment agreement (if any).

     13.2  Stockholders'  Rights.  A Participant  shall have no dividend rights,
voting rights or other rights as a stockholder with respect to any Common Shares
covered by his or her Award  prior to the  issuance of a stock  certificate  for
such Common  Shares.  No  adjustment  shall be made for cash  dividends or other
rights for which the record date is prior to the date when such  certificate  is
issued, except as expressly provided in Articles 8, 9 and 10.

     13.3   Regulatory   Requirements.   Any   other   provision   of  the  Plan
notwithstanding,  the obligation of the Company to issue Common Shares under the
Plan shall be subject to all applicable  laws,  rules and  regulations  and such
approval by any  regulatory  body as may be required.  The Company  reserves the
right to restrict,  in whole or in part, the delivery of Common Shares  pursuant
to any Award prior to the satisfaction of all legal requirements relating to the
issuance of such Common Shares, to their registration,  qualification or listing
or to an exemption from registration, qualification or listing.

     ARTICLE 14. LIMITATION ON PAYMENTS.

     14.1 Basic Rule. Any provision of the Plan to the contrary notwithstanding,
in the event that the independent  auditors most recently  selected by the Board
(the "Auditors") determine that any payment or transfer by the Company under the
Plan to or for the benefit of a Participant (a "Payment") would be nondeductible
by the  Company  for  federal  income tax  purposes  because  of the  provisions
concerning  "excess  parachute  payments" in section 280G of the Code,  then the
aggregate present value of all Payments shall be reduced (but not below zero) to
the Reduced Amount;  provided that the Committee, at the time of making an Award
under this Plan or at any time  thereafter,  may  specify  in writing  that such
Award shall not be so reduced  and shall not be subject to this  Article 14. For
purposes of this Article 14, the "Reduced Amount" shall be the amount, expressed
as a present value,  which maximizes the aggregate present value of the Payments
without  causing  any  Payment to be  nondeductible  by the  Company  because of
section 280G of the Code.

     14.2  Reduction of Payments.  If the  Auditors  determine  that any Payment
would be  nondeductible by the Company because of section 280G of the Code, then
the Company shall promptly give the Participant notice to that effect and a copy
of the  detailed  calculation  thereof  and  of  the  Reduced  Amount,  and  the
Participant may then elect, in his or her sole discretion, which and how much of
the Payments  shall be eliminated or reduced (as long as after such election the
aggregate  present  value of the Payments  equals the Reduced  Amount) and shall
advise the Company in writing of his or her  election  within 10 days of receipt
of notice.  If no such  election is made by the  Participant  within such 10-day
period,  then the Company may elect which and how much of the Payments  shall be

                                      A-7

<PAGE>

eliminated  or reduced (as long as after such  election  the  aggregate  present
value  of  the  Payments  equals  the  Reduced  Amount)  and  shall  notify  the
Participant promptly of such election.  For purposes of this Article 14, present
value shall be determined in accordance with section 280G(d)(4) of the Code. All
determinations  made by the Auditors under this Article 14 shall be binding upon
the  Company  and the  Participant  and shall be made within 60 days of the date
when a Payment  becomes  payable or  transferable.  As promptly  as  practicable
following such determination and the elections hereunder,  the Company shall pay
or transfer to or for the benefit of the  Participant  such  amounts as are then
due to him or her under the Plan and shall  promptly  pay or  transfer to or for
the benefit of the  Participant  in the future such amounts as become due to him
or her under the Plan.

     14.3  Overpayments  and  Underpayments.  As a result of  uncertainty in the
application of section 280G of the Code at the time of an initial  determination
by the Auditors  hereunder,  it is possible that Payments will have been made by
the  Company  which  should  not  have  been  made  (an  "Overpayment")  or that
additional Payments which will not have been made by the Company could have been
made (an  "Underpayment"),  consistent in each case with the  calculation of the
Reduced  Amount  hereunder.  In the  event  that the  Auditors,  based  upon the
assertion of a deficiency by the Internal Revenue Service against the Company or
the Participant  which the Auditors  believe has a high  probability of success,
determine that an Overpayment has been made, such  Overpayment  shall be treated
for all purposes as a loan to the Participant which he or she shall repay to the
Company,  together  with  interest at the  applicable  federal rate  provided in
section  7872(f)(2)  of the Code;  provided,  however,  that no amount  shall be
payable by the Participant to the Company if and to the extent that such payment
would not reduce the amount which is subject to taxation  under  section 4999 of
the Code.  In the event that the Auditors  determine  that an  Underpayment  has
occurred, such Underpayment shall promptly be paid or transferred by the Company
to or for  the  benefit  of  the  Participant,  together  with  interest  at the
applicable federal rate provided in section 7872(f)(2) of the Code.

     14.4  Related  Corporations.  For  purposes  of this  Article  14, the term
"Company" shall include affiliated  corporations to the extent determined by the
Auditors in accordance with section 280G(d)(5) of the Code.

     ARTICLE 15. WITHHOLDING TAXES.

     15.1 General. To the extent required by applicable federal, state, local or
foreign  law, a  Participant  or his or her  successor  shall make  arrangements
satisfactory  to  the  Company  for  the  satisfaction  of any  withholding  tax
obligations  that arise in  connection  with the Plan.  The Company shall not be
required  to issue any  Common  Shares or make any cash  payment  under the Plan
until such obligations are satisfied.

     15.2 Share  Withholding.  The Committee may permit a Participant to satisfy
all or part of his or her  withholding  or income tax  obligations by having the
Company  withhold all or a portion of any Common Shares that otherwise  would be
issued to him or her or by  surrendering  all or a portion of any Common  Shares
that he or she previously acquired.  Such Common Shares shall be valued at their
Fair Market  Value on the date when taxes  otherwise  would be withheld in cash.
Any payment of taxes by assigning Common Shares to the Company may be subject to
restrictions, including any restrictions required by rules of the Securities and
Exchange Commission.

     ARTICLE 16. ASSIGNMENT OR TRANSFER OF AWARDS.

     16.1 General.  Except as provided in Article 15, an Award granted under the
Plan  shall  not  be  anticipated,   assigned,  attached,  garnished,  optioned,
transferred  or made subject to any  creditor's  process,  whether  voluntarily,
involuntarily  or by operation of law. An Option or SAR may be exercised  during
the  lifetime of the  Optionee  only by him or her or by his or her  guardian or
legal  representative.  Any act in  violation  of this Article 16 shall be void.
However,  this Article 16 shall not preclude a  Participant  from  designating a
beneficiary  who  will  receive  any  outstanding  Awards  in the  event  of the
Participant's  death,  nor shall it  preclude a transfer of Awards by will or by
the laws of descent and distribution.

     16.2 Trusts.  Neither  this Article 16 nor any other  provision of the Plan
shall preclude a Participant from transferring or assigning Restricted Shares to
(a) the trustee of a trust that is revocable by such Participant  alone, both at
the time of the transfer or assignment and at all times thereafter prior to such
Participant's  death,  or (b) the  trustee  of any  other  trust  to the  extent
approved in advance by the  Committee in writing.  A transfer or  assignment  of
Restricted  Shares from such trustee to any person  other than such  Participant
shall be permitted  only to the extent  approved in advance by the  Committee in
writing,  and Restricted  Shares held by such trustee shall be


                                      A-8

<PAGE>

subject to all of the conditions and  restrictions  set forth in the Plan and in
the applicable  Stock Award  Agreement,  as if such trustee were a party to such
Agreement.

     ARTICLE 17. FUTURE OF THE PLAN.

     17.1  Term of the Plan.  The Plan,  as set  forth  herein,  was  originally
adopted on February 7, 1996,  and became  effective on the date of the Company's
initial public offering.  The Plan shall remain in effect until it is terminated
under Section 17.2, except that no ISOs shall be granted after February 6, 2006.

     17.2  Amendment  or  Termination.  The Board  may,  at any time and for any
reason,  amend or terminate the Plan,  including  the  provisions of Section 4.2
relating to the amount,  price and timing of Option grants to Outside Directors.
An  amendment  of the Plan  shall be subject to the  approval  of the  Company's
stockholders  only to the extent  required by applicable  laws,  regulations  or
rules. No Awards shall be granted under the Plan after the termination  thereof.
The  termination  of the Plan,  or any amendment  thereof,  shall not affect any
Award previously granted under the Plan.

     ARTICLE 18. DEFINITIONS.

     18.1 "Award" means any award of an Option,  an SAR, a Restricted Share or a
Stock Unit under the Plan.

     18.2 "Board" means the Company's  Board of Directors,  as constituted  from
time to time.

     18.3 "Change in Control"  shall mean the occurrence of any of the following
events:

          (a) The  consummation of a merger or consolidation of the Company with
     or into another entity or any other corporate reorganization,  if more than
     50% of the combined  voting power of the  continuing or surviving  entity's
     securities  outstanding  immediately  after such merger,  consolidation  or
     other  reorganization  is owned by persons who were not stockholders of the
     Company   immediately   prior  to  such  merger,   consolidation  or  other
     reorganization;

          (b) A change in the  composition  of the  Board,  as a result of which
     fewer than one-half of the incumbent directors are directors who either:

               (A) Had been  directors  of the  Company 24 months  prior to such
          change; or

               (B) Were elected,  or nominated  for election,  to the Board with
          the affirmative  votes of at least a majority of the directors who had
          been  directors  of the Company 24 months prior to such change and who
          were still in office at the time of the election or nomination; or

          (c) Any "person" (as such term is used in sections  13(d) and 14(d) of
     the Exchange Act) by the  acquisition  or  aggregation  of securities is or
     becomes the beneficial owner, directly or indirectly,  of securities of the
     Company  representing  50% or  more of the  combined  voting  power  of the
     Company's then  outstanding  securities  ordinarily  (and apart from rights
     accruing under special circumstances) having the right to vote at elections
     of  directors  (the "Base  Capital  Stock");  except that any change in the
     relative  beneficial  ownership of the  Company's  securities by any person
     resulting  solely from a reduction in the aggregate  number of  outstanding
     shares of Base Capital Stock, and any decrease  thereafter in such person's
     ownership of securities,  shall be disregarded  until such person increases
     in any manner,  directly or indirectly,  such person's beneficial ownership
     of any securities of the Company.

The term "Change in Control" shall not include a  transaction,  the sole purpose
of which is to change the state of the Company's incorporation.

     18.4 "Code" means the Internal Revenue Code of 1986, as amended.

     18.5 "Committee" means a committee of the Board, as described in Article 2.


                                      A-9

<PAGE>

     18.6 "Common Share" means one share of the common stock of the Company.

     18.7 "Company" means Trega Biosciences, Inc., a Delaware corporation.

     18.8 "Exchange Act" means the Securities Exchange Act of 1934, as amended.

     18.9 "Exercise Price," in the case of an Option, means the amount for which
one Common Share may be purchased upon exercise of such Option,  as specified in
the applicable Stock Option Agreement.  "Exercise Price," in the case of an SAR,
means  an  amount,  as  specified  in the  applicable  SAR  Agreement,  which is
subtracted  from the Fair Market  Value of one Common Share in  determining  the
amount payable upon exercise of such SAR.

     18.10  "Fair  Market  Value"  means  the  market  price of  Common  Shares,
determined by the Committee as follows:

          (a) If the Common Shares were traded  over-the-counter  on the date in
     question  but was not  traded on the Nasdaq  system or the Nasdaq  National
     Market  System,  then  the  Fair  Market  Value  shall be equal to the mean
     between the last  reported  representative  bid and asked prices quoted for
     such date by the principal automated inter-dealer quotation system on which
     the Common Shares are quoted or, if the Common Shares are not quoted on any
     such system,  by the "Pink  Sheets"  published  by the  National  Quotation
     Bureau, Inc.;

          (b) If the Common Shares were traded  over-the-counter  on the date in
     question and were traded on the Nasdaq system or the Nasdaq National Market
     System,  then the Fair Market Value shall be equal to the  last-transaction
     price  quoted  for such date by the Nasdaq  system or the  Nasdaq  National
     Market System;

          (c) If the Common  Shares were traded on a stock  exchange on the date
     in question, then the Fair Market Value shall be equal to the closing price
     reported by the applicable composite transactions report for such date; and

          (d) If none of the foregoing  provisions is applicable,  then the Fair
     Market  Value shall be  determined  by the  Committee in good faith on such
     basis as it deems appropriate.

Whenever possible, the determination of Fair Market Value by the Committee shall
be based on the  prices  reported  in the  Western  Edition  of The Wall  Street
Journal. Such determination shall be conclusive and binding on all persons.

     18.11 "ISO" means an incentive stock option  described in section 422(b) of
the Code.

     18.12 "Key  Employee"  means (a) a common-law  employee of the  Company,  a
Parent or a Subsidiary,  (b) an Outside Director and (c) a consultant or advisor
who provides services to the Company, a Parent or a Subsidiary as an independent
contractor. Service as an Outside Director or as an independent contractor shall
be  considered  employment  for all purposes of the Plan,  except as provided in
Sections 4.2 and 4.3.

     18.13 "NSO" means a stock  option not  described  in sections 422 or 423 of
the Code.

     18.14 "Option" means an ISO or NSO granted under the Plan and entitling the
holder to purchase one Common Share.

     18.15 "Optionee" means an individual or estate who holds an Option or SAR.

     18.16  "Outside  Director"  shall  mean a member  of the Board who is not a
common-law employee of the Company, a Parent or a Subsidiary.

     18.17  "Parent"  means  any  corporation  (other  than the  Company)  in an
unbroken  chain  of  corporations  ending  with  the  Company,  if  each  of the
corporations  other than the Company  owns stock  possessing  50% or more


                                      A-10

<PAGE>

of the total  combined  voting power of all classes of stock in one of the other
corporations in such chain. A corporation that attains the status of a Parent on
a date after the adoption of the Plan shall be considered a Parent commencing as
of such date.

     18.18 "Participant" means an individual or estate who holds an Award.

     18.19 "Plan"  means this 1996 Stock  Incentive  Plan of Trega  Biosciences,
Inc., as amended from time to time.

     18.20 "Restricted Share" means a Common Share awarded under the Plan.

     18.21 "SAR" means a stock appreciation right granted under the Plan.

     18.22 "SAR  Agreement"  means the  agreement  between  the  Company  and an
Optionee which contains the terms, conditions and restrictions pertaining to his
or her SAR.

     18.23 "Stock Award Agreement"  means the agreement  between the Company and
the  recipient  of a  Restricted  Share or Stock Unit which  contains the terms,
conditions and restrictions pertaining to such Restricted Share or Stock Unit.

     18.24 "Stock Option  Agreement" means the agreement between the Company and
an Optionee which contains the terms,  conditions and restrictions pertaining to
his or her Option.

     18.25 "Stock Unit" means a bookkeeping entry representing the equivalent of
one Common Share, as awarded under the Plan.

     18.26  "Subsidiary"  means any  corporation  (other than the Company) in an
unbroken  chain  of  corporations  beginning  with the  Company,  if each of the
corporations  other than the last  corporation  in the unbroken chain owns stock
possessing  50% or more of the total  combined  voting  power of all  classes of
stock in one of the other corporations in such chain. A corporation that attains
the status of a  Subsidiary  on a date after the  adoption  of the Plan shall be
considered a Subsidiary commencing as of such date.

     ARTICLE 19. EXECUTION.

     To record the adoption of the Plan by the Board, the Company has caused its
duly authorized officer to affix the corporate name and seal hereto.


                             TREGA BIOSCIENCES, INC.


                                      A-11

<PAGE>

                                   APPENDIX B


                      1996 EMPLOYEE STOCK PURCHASE PLAN OF
                             TREGA BIOSCIENCES, INC.


     SECTION 1. PURPOSE OF THE PLAN.

     The Plan,  previously known as the Employee Stock Purchase Plan of Houghten
Pharmaceuticals,  Inc.,  was  adopted  by the Board on  February  7,  1996,  and
approved by the Company's  stockholders in March 1998. The Plan became effective
as of the date of the Company's initial public offering.  An increase by 150,000
in the number of shares of Stock  available  under the Plan was  approved by the
Board  of  Directors  as of May  11,  1998  (to be  effective  upon  stockholder
approval).

     The  purpose  of  the  Plan  is  to  provide  Eligible  Employees  with  an
opportunity to increase their proprietary interest in the success of the Company
by  purchasing  Stock from the  Company on  favorable  terms and to pay for such
purchases  through  payroll  deductions.  The Plan is intended to qualify  under
section 423 of the Code.

     The Plan shall be governed by, and construed in accordance  with,  the laws
of the State of Delaware (except their choice-of-law provisions).

     SECTION 2. ADMINISTRATION OF THE PLAN.

     (a) The Committee.  The Plan shall be  administered  by the Committee.  The
interpretation and construction by the Committee of any provision of the Plan or
of any right to purchase  Stock granted  under the Plan shall be conclusive  and
binding on all persons.

     (b) Rules and Forms. The Committee may adopt such rules and forms under the
Plan as it considers appropriate.

     SECTION 3. ENROLLMENT AND PARTICIPATION.

     (a) Participation Periods. There shall be two Participation Periods in each
calendar year, except that there shall be only one Participation Period in 1996.
The Participation  Periods shall consist of the six-month periods  commencing on
January 1 and July 1, except that the first Participation  Period shall commence
on the date of the Company's  initial public  offering and shall end on December
31, 1996.

     (b)  Enrollment.  Any individual  who, on the first day of a  Participation
Period,  qualifies as an Eligible  Employee may elect to become a Participant in
the Plan  for  such  Participation  Period  by  executing  the  enrollment  form
prescribed for this purpose by the Committee. The enrollment form shall be filed
with the Company at the  prescribed  location at least five business days before
the commencement of such Participation Period.

     (c) Duration of Participation.  Once enrolled, a Participant shall continue
to participate in the Plan for each succeeding  Participation Period until he or
she ceases to be an Eligible  Employee,  withdraws  from the Plan or reaches the
end of the  Participation  Period  in  which  he or  she  discontinued  employee
contributions  under  Section  4(d). A  Participant  who  discontinued  employee
contributions  under  Section 4(d) or withdrew  from the Plan under Section 5(a)
may again become a Participant,  if he or she then is an Eligible  Employee,  by
following the procedure  described in Subsection (b) above. A Participant  whose
employee contributions were discontinued  automatically under Section 8(b) shall
automatically  resume  participation at the beginning of the next calendar year,
if he or she then is an Eligible Employee.


                                      B-1

<PAGE>

     SECTION 4. EMPLOYEE CONTRIBUTIONS.

     (a) Frequency of Payroll  Deductions.  A Participant may purchase shares of
Stock under the Plan solely by means of payroll deductions.  Payroll deductions,
as  designated  by the  Participant  pursuant  to  Subsection  (b) below,  shall
commence with the first payday in the Participation Period and shall continue on
each subsequent payday during participation in the Plan.

     (b) Amount of Payroll  Deductions.  An Eligible Employee shall designate on
the enrollment form the portion of his or her Compensation that he or she elects
to have  withheld  for the  purchase  of Stock.  Such  portion  shall be a whole
percentage  of the  Eligible  Employee's  Compensation,  but not  less  than one
percent nor more than 10%. Compensation shall not be withheld in arrears.

     (c) Changing  Withholding Rate. If a Participant  wishes to change the rate
of payroll withholding, he or she may do so by filing a new enrollment form with
the Company at the  prescribed  location at least five  business days before the
commencement  of  the  Participation  Period  for  which  such  change  is to be
effective.

     (d)  Discontinuing   Payroll   Deductions.   If  a  Participant  wishes  to
discontinue employee contributions entirely, he or she may do so by filing a new
enrollment form with the Company at the prescribed location.  The discontinuance
shall be effective as soon as  reasonably  practicable  after such form has been
received  by  the  Company.   (In  addition,   employee   contributions  may  be
discontinued   automatically  pursuant  to  Section  8(b).)  A  Participant  who
discontinued  employee  contributions under this Subsection (d) shall not resume
such contributions during the same Participation Period.

     SECTION 5. WITHDRAWAL FROM THE PLAN.

     (a) Withdrawal. A Participant may elect to withdraw from the Plan by filing
the  prescribed  form with the Company at the  prescribed  location.  As soon as
reasonably practicable thereafter, payroll deductions shall cease and the entire
amount  credited to the  Participant's  Plan Account shall be refunded to him or
her in cash, without interest. No partial withdrawals shall be permitted.

     (b) Re-Enrollment After Withdrawal.  A former Participant who has withdrawn
from the Plan  shall  not be a  Participant  until  he or she  re-enrolls  for a
subsequent Participation Period under Section 3(b).

     SECTION 6. CHANGE IN EMPLOYMENT STATUS.

     (a)  Termination  of  Employment.  Termination of employment as an Eligible
Employee  for any  reason,  including  death,  shall be treated as an  automatic
withdrawal from the Plan under Section 5(a). (A transfer from one  Participating
Company to another shall not be treated as a termination of employment.)

     (b) Leave of Absence.  For  purposes of the Plan,  employment  shall not be
deemed to terminate when the Participant  goes on a military leave, a sick leave
or another bona fide leave of absence,  if the leave was approved by the Company
in writing. Employment,  however, shall be deemed to terminate 90 days after the
Participant  goes on a leave,  unless a contract or statute  protects his or her
right to return to work.  Employment  shall be deemed to  terminate in any event
when the approved  leave ends,  unless the  Participant  immediately  returns to
work. The Company shall determine which leaves count for this purpose.

     (c) Death. In the event of the Participant's  death, the amount credited to
his or her Plan Account shall be paid to a beneficiary  designated by him or her
for this  purpose  on the  prescribed  form or,  if none,  to the  Participant's
estate.  Such form shall be valid  only if it was filed with the  Company at the
prescribed location before the Participant's death.

     SECTION 7. PLAN ACCOUNTS AND PURCHASE OF SHARES.

     (a) Plan  Accounts.  The Company shall maintain a Plan Account on its books
in the  name of each  Participant.  Whenever  an  amount  is  deducted  from the
Participant's  Compensation under the Plan, such amount shall be credited to the
Participant's Plan Account. No interest shall be credited to Plan Accounts.

     (b) Purchase Price. The Purchase Price for each share of Stock shall be the
lower of:



                                      B-2
<PAGE>

          (i) 85% of the Fair  Market  Value of  Stock on the last  trading  day
     before the Participation Period commences; or

          (ii) 85% of the Fair Market  Value of Stock on the last trading day in
     the Participation Period.

     (c) Number of Shares  Purchased.  As of the last day of each  Participation
Period,  each Participant shall be deemed to have elected to purchase the number
of shares of Stock calculated in accordance with this Subsection (c), unless the
Participant has previously  elected to withdraw from the Plan in accordance with
Section 5(a). The amount then in the Participant's Plan Account shall be divided
by the Purchase  Price,  and the number of whole  shares that  results  shall be
purchased from the Company with the funds in the Participant's Plan Account. The
foregoing notwithstanding,  no Participant shall purchase more than a maximum of
2,500  shares of Stock with  respect to any  Participation  Period nor shares of
Stock in excess of the amounts set forth in Sections 8 and 12(a).

     (d) Available Shares  Insufficient.  In the event that the aggregate number
of shares that all Participants elect to purchase during a Participation  Period
exceeds the maximum  number of shares  remaining  available  for issuance  under
Section 12(a),  then the number of shares to which each  Participant is entitled
shall be determined by multiplying  the number of shares  available for issuance
by a  fraction,  the  numerator  of which is the  number  of  shares  that  such
Participant  has elected to purchase and the  denominator of which is the number
of shares that all Participants have elected to purchase.

     (e)  Issuance  of  Stock.   At  a   Participant's   request,   certificates
representing  the  number of shares  of Stock  purchased  by him or her shall be
issued as soon as reasonably  practicable  after the close of the  Participation
Period.  Absent a request from the Participant,  shares purchased under the Plan
shall be held  for the  Participant's  benefit  by a  broker  designated  by the
Company.  Shares may be registered in the name of the  Participant or jointly in
the name of the Participant and his or her spouse as joint tenants with right of
survivorship or as community property.

     (f) Unused Cash Balances.  An amount  remaining in the  Participant's  Plan
Account that  represents the Purchase  Price for any  fractional  share shall be
carried over in the Participant's Plan Account to the next Participation Period.
Any amount  remaining in the  Participant's  Plan Account  that  represents  the
Purchase  Price  for  shares  which  could  not be  purchased  by  reason of the
limitations in Subsections  (c) and (d) above,  Section 8 or Section 12(a) shall
be refunded to the Participant in cash, without interest.

     SECTION 8. LIMITATIONS ON STOCK OWNERSHIP.

     (a) Five Percent Limit. Any other provision of the Plan notwithstanding, no
Participant  shall be granted a right to  purchase  Stock under the Plan if such
Participant, immediately after his or her election to purchase such Stock, would
own stock possessing more than 5% of the total combined voting power or value of
all classes of stock of the Company or any Parent or  Subsidiary of the Company.
For purposes of this  Subsection  (a),  ownership  of stock shall be  determined
after  applying the  attribution  rules of section  424(d) of the Code, and each
Participant  shall be  considered to own any stock that he or she has a right or
option to purchase under this or any other plan.

     (b) $25,000  Limit.  Any other  provision of the Plan  notwithstanding,  no
Participant  shall be granted a right to  purchase  Stock under the Plan if such
Participant's  rights to purchase  stock under this and all other employee stock
purchase  plans of the Company or any Parent or  Subsidiary of the Company would
accrue at a rate that  exceeds  $25,000 of the fair  market  value of such stock
(determined  at the beginning of the applicable  Participation  Period) for each
calendar year for which such right is  outstanding  at any time. For purposes of
this Subsection (b),  employee stock purchase plans not described in section 423
of the  Code  shall  be  disregarded.  If a  Participant  is  precluded  by this
Subsection (b) from purchasing  additional Stock under the Plan, then his or her
employee  contributions  shall  automatically be discontinued for the balance of
the calendar  year and resume at the  beginning of the next calendar year (if he
or she then is an Eligible Employee).


                                      B-3

<PAGE>

     (c) 2,500 Share Limit. Any other provision of the Plan notwithstanding,  no
Participant  may  purchase  more than 2,500 shares of Stock under this Plan with
respect to any  Participation  Period.  If a  Participant  is  precluded by this
Subsection (c) from purchasing  additional Stock under the Plan, then his or her
employee  contributions  shall  automatically be discontinued for the balance of
the Participation  Period and resume at the beginning of the next  Participation
Period (if he or she then is an Eligible Employee).

     SECTION 9. RIGHTS NOT TRANSFERABLE.

     The rights of any Participant under the Plan, or any Participant's interest
in any Stock or moneys to which he or she may be entitled under the Plan,  shall
not be  transferable  by voluntary or involuntary  assignment or by operation of
law, or in any other manner other than by beneficiary designation or the laws of
descent and  distribution.  If a Participant in any manner attempts to transfer,
assign or otherwise encumber his or her rights or interest under the Plan, other
than by beneficiary  designation or the laws of descent and  distribution,  then
such act shall be treated as an election by the Participant to withdraw from the
Plan under Section 5(a).

     SECTION 10. NO RIGHTS AS AN EMPLOYEE.

     Nothing  in the Plan  shall be  construed  to give any  person the right to
remain in the employ of a  Participating  Company.  Each  Participating  Company
reserves the right to terminate the  employment of any person at any time,  with
or without cause.

     SECTION 11. NO RIGHTS AS A STOCKHOLDER.

     A  Participant  shall have no rights as a  stockholder  with respect to any
shares that he or she has purchased, or may have a right to purchase,  under the
Plan until the date of issuance of a stock certificate for such shares.

     SECTION 12. STOCK OFFERED UNDER THE PLAN.

     (a) Authorized  Shares.  The aggregate  number of shares of Stock available
for purchase under the Plan shall be 250,000,  subject to adjustment pursuant to
this Section 12.

     (b)  Anti-Dilution  Adjustments.  The  aggregate  number of shares of Stock
offered under the Plan, the 2,500-share limitation described in Section 7(c) and
the price of shares  that any  Participant  has  elected  to  purchase  shall be
adjusted  proportionately  by the  Committee for any increase or decrease in the
number  of  outstanding   shares  of  Stock  resulting  from  a  subdivision  or
consolidation of shares, the payment of a stock dividend,  any other increase or
decrease in such shares effected  without receipt or payment of consideration by
the Company,  or the distribution of the shares of a Subsidiary to the Company's
stockholders.

     (c)  Reorganizations.  In the event of a dissolution  or liquidation of the
Company,  or a merger or  consolidation  to which the  Company is a  constituent
corporation,  the Plan shall terminate unless the plan of merger,  consolidation
or reorganization  provides  otherwise,  and all amounts that have been withheld
but not yet applied to  purchase  Stock  hereunder  shall be  refunded,  without
interest.  The Plan shall in no event be  construed  to  restrict in any way the
Company's right to undertake a dissolution,  liquidation,  merger, consolidation
or other reorganization.

     SECTION 13. AMENDMENT OR DISCONTINUANCE.

     The Board shall have the right to amend,  suspend or terminate  the Plan at
any time and without  notice.  Except as provided in Section 12, any increase in
the  aggregate  number of shares of Stock to be issued  under the Plan  shall be
subject to approval by a vote of the  stockholders of the Company.  In addition,
any other  amendment  of the Plan shall be subject to  approval by a vote of the
stockholders  of the  Company to the extent  required  by an  applicable  law or
regulation.

     SECTION 14. DEFINITIONS.

     (a) "Board"  means the Board of Directors of the  Company,  as  constituted
from time to time.



                                      B-4
<PAGE>

     (b) "Code" means the Internal Revenue Code of 1986, as amended.

     (c) "Committee"  means a committee of the Board,  consisting of one or more
directors appointed by the Board.

     (d) "Company" means Trega Biosciences, Inc., a Delaware corporation.

     (e)  "Compensation"  means  the  regular  compensation  paid  in  cash to a
Participant  by  a  Participating  Company,  plus  amounts  contributed  by  the
Participant to this Plan or to other employee  benefit or  deferred-compensation
plans (whether on a pre-tax or after-tax basis). Compensation shall include base
salaries  and wages,  commissions,  and  vacation  pay,  sick pay and other wage
replacement payments but shall exclude bonuses, incentive compensation, overtime
pay,  moving  or  relocation   allowances,   car   allowances,   imputed  income
attributable  to cars or life  insurance,  taxable  fringe  benefits and similar
items, all as determined by the Committee.

     (f) "Eligible  Employee"  means any common-law  employee of a Participating
Company whose customary employment is for:

          (i) More than five months per calendar year; and

          (ii) More than 20 hours per week.

The foregoing notwithstanding, an individual shall not be considered an Eligible
Employee if his or her participation in the Plan is prohibited by the law of any
country which has jurisdiction over him or her.

     (g) "Fair Market Value" means the market price of Stock,  determined by the
Committee as follows:

          (i) If the Stock was traded  over-the-counter  on the date in question
     but was not  traded on the  Nasdaq  system or the  Nasdaq  National  Market
     System,  then the Fair Market  Value shall be equal to the mean between the
     last reported  representative  bid and asked prices quoted for such date by
     the principal automated inter-dealer quotation system on which the Stock is
     quoted  or, if the Stock is not  quoted  on any such  system,  by the "Pink
     Sheets" published by the National Quotation Bureau, Inc.;

          (ii) If the Stock was traded  over-the-counter on the date in question
     and was traded on the Nasdaq system or the Nasdaq  National  Market System,
     then the Fair  Market  Value shall be equal to the  last-transaction  price
     quoted for such date by the Nasdaq  system or the  Nasdaq  National  Market
     System;

          (iii) If the  Stock  was  traded  on a stock  exchange  on the date in
     question,  then the Fair Market  Value shall be equal to the closing  price
     reported by the applicable composite transactions report for such date; and

          (iv) If none of the foregoing provisions is applicable,  then the Fair
     Market  Value shall be  determined  by the  Committee in good faith on such
     basis as it deems appropriate.

Whenever possible, the determination of Fair Market Value by the Committee shall
be based on the  prices  reported  in the  Western  Edition  of The Wall  Street
Journal. Such determination shall be conclusive and binding on all persons.

     (h) "Parent" means any corporation  (other than the Company) in an unbroken
chain of corporations ending with the Company, if each of the corporations other
than the Company owns stock  possessing 50% or more of the total combined voting
power of all classes of stock in one of the other  corporations in such chain. A
corporation  that attains the status of a Parent on a date after the adoption of
the Plan shall be considered a Parent commencing as of such date.

     (i)  "Participant"  means an Eligible Employee who elects to participate in
the Plan, as provided in Section 3(b).

     (j) "Participating  Company" means (i) the Company and (ii) each Subsidiary
designated  from  time  to time by the  Committee.  An  entity  that  becomes  a
Subsidiary  after  adoption of the Plan may be  designated by the Committee as a
Participating Company.

     (k) "Participation Period" means a period during which contributions may be
made  toward the  purchase of


                                      B-5

<PAGE>

Stock under the Plan, as determined pursuant to Section 3(a).

     (l) "Plan" means this Employee  Stock  Purchase Plan of Trega  Biosciences,
Inc., as amended from time to time.

     (m) "Plan  Account"  means the  account  established  for each  Participant
pursuant to Section 7(a).

     (n)  "Purchase  Price" means the price at which  Participants  may purchase
Stock under the Plan, as determined pursuant to Section 7(b).

     (o) "Stock" means the Common Stock of the Company.

     (p)  "Subsidiary"  means any  corporation  (other  than the  Company) in an
unbroken  chain  of  corporations  beginning  with the  Company,  if each of the
corporations  other than the last  corporation  in the unbroken chain owns stock
possessing  50% or more of the total  combined  voting  power of all  classes of
stock in one of the other corporations in such chain. A corporation that attains
the status of a  Subsidiary  on a date after the  adoption  of the Plan shall be
considered a Subsidiary commencing as of such date.

     SECTION 15. EXECUTION.

     To record the adoption of the Plan by the Board, the Company has caused its
duly authorized officer to affix the corporate name and seal hereto.


                                                TREGA BIOSCIENCES, INC.



                                      B-6

<PAGE>

                             TREGA BIOSCIENCES, INC.
               PROXY SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS
                      For Annual Meeting - August 25, 1998

ROBERT S. WHITEHEAD,  LAWRENCE D. MUSCHECK and NOEL M. WHEELER,  or any of them,
each with the power of  substitution,  are hereby  authorized  to  represent  as
proxies and vote all shares of stock of Trega Biosciences,  Inc. (the "Company")
that the  undersigned is entitled to vote at the Annual Meeting of  Stockholders
of the Company to be held at the Company's  headquarters  located at 9880 Campus
Point Drive, San Diego,  California,  on Tuesday, August 25, 1998, at 9:00 a.m.,
Pacific  Daylight Time or at any  postponement or adjournment  thereof,  and the
undersigned  instructs  said proxies to vote as follows  (with  reference to the
Proxy Statement of the Company dated July 15, 1998):



                  (continued and to be signed on reverse side)

                              FOLD AND DETACH HERE



<PAGE>
<TABLE>
<S>                                                                                                                 <C>            
The Board of Directors recommends a vote FOR the election of all nominees indicated below and FOR Items 2, 3 and 4.   Please mark
                                                                                                                     your votes as
                                                                                                                     indicated in
                                                                                                                     this example

                                                                                                                          [X]

<S>                            <C>                                                 <C>                                              
1. Election of Directors       Nominees: Harvey S. Sadow and Robert S. Whitehead   2. To approve the proposal to increase the number
                                                                                      of shares of the Company's Common Stock 
  FOR all      WITHHOLD        (INSTRUCTION: To withhold authority to vote for        available for issuance under the Company's
  Class I      AUTHORITY       any individual nominee, write that nominee's name      1996 Stock Incentive Plan and to approve such
   listed       to vote        in the space provided below.)                          plan as amended and restated:
 (except as     for all        
indicated to    nominees       -------------------------------------------------          FOR       AGAINST       ABSTAIN
  contrary)      listed                                                                    [ ]        [ ]           [ ]
    [ ]            [ ]

<S>                                           <C>                                           <C>                                     
3. To approve  the  proposal to increase      4. To ratify the  appointment of Ernst &      5. In their discretion,  upon such other
   the number of shares of the Company's         Young    LLP   as    the    Company's         business as may properly  come before
   Common Stock  available  for issuance         independent auditors:                         the Annual Meeting.                  
   under  the  Company's  1996  Employee                                                     
   Stock Purchase Plan:
     FOR       AGAINST       ABSTAIN                FOR      AGAINST       ABSTAIN
     [ ]         [ ]           [ ]                  [ ]        [ ]           [ ]  
                                                   
                                                                             Shares  represented  by this  proxy  will be  voted  as
                                                                             directed by the stockholder.  If no such directions are
                                                                             indicated,  the proxies will have authority to vote FOR
                                                                             the election of all nominees and FOR Items 2, 3 and 4.

                                                                             Dated: __________________________________________, 1998

                                                                             -------------------------------------------------------
                                                                                             Signature of Stockholder

                                                                             -------------------------------------------------------
                                                                                             Signature of Stockholder

                                                                             Please sign exactly as your name or names appear on the
                                                                             proxy.    When   signing   as    attorney,    executor,
                                                                             administrator,  trustee or  guardian,  please give full
                                                                             title as such. If shares are held jointly,  each holder
                                                                             should sign. By your signature you acknowledge  receipt
                PLEASE MARK, SIGN, DATE AND MAIL THIS PROXY CARD             of  the  Company's Proxy  Statement dated July 15, 1998
                     PROMPTLY, USING THE ENCLOSED ENVELOPE.                  and the related Notice of Annual Meeting.
</TABLE>


                             FOLD AND DETACH HERE 




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