SUGEN INC
10-Q, 1997-08-14
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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================================================================================
                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549
                          -----------------------------

                                    FORM 10-Q

(Mark one)

 X   Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange
- ---  Act of 1934. For the quarterly period ended June 30, 1997.
     or

     Transition  report  pursuant  to  Section  13 or  15(d)  of the  Securities
- ---  Exchange  Act of  1934.  For the  transition  period  from  ___________  to
     ___________.


                             Commission File Number:
                                     0-24814
                          -----------------------------


                                   SUGEN, Inc.
             (Exact name of registrant as specified in its charter)

          Delaware                                          13-3629196
(State or other jurisdiction of                          (I.R.S. Employer
 incorporation or organization)                          Identification No.)


               351 Galveston Drive, Redwood City, California 94063
                    (address of principal executive offices)

                                 (415) 306-7700
              (Registrant's telephone number, including area code)


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



Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required to file such reports),  and (2) has been subject to filing requirements
for the past 90 days. Yes  X  No
                          ---    ---

Indicate the number of shares  outstanding  of each of the  issuer's  classes of
common stock, as of the latest  practicable  date.  Common Stock $.01 par value;
13,128,836 shares outstanding at July 31, 1997.

================================================================================

<PAGE>


                                   SUGEN, Inc.

                                      INDEX

                                                                        PAGE NO.
                                                                        --------
PART I.  FINANCIAL INFORMATION

Item 1. Financial Statements and Notes

        Condensed Balance Sheets - June 30, 1997
        and December 31, 1996                                              3

        Statements of Operations - for the three and six
        months ended June 30, 1997 and 1996                                4

        Condensed Statements of Cash Flows - for the six
        months ended June 30, 1997 and 1996                                5

        Notes to Financial Statements                                      6

Item 2. Management's Discussion and Analysis of Financial
        Condition and Results of Operations                                7


PART II. OTHER INFORMATION

Item 4. Submission of Matters to a Vote of Security Holders               11

Item 6. Exhibits and Reports on Form 8-K                                  12


Signatures                                                                13


Exhibit Index                                                             14

                                        2

<PAGE>

                         PART I. FINANCIAL INFORMATION

Item 1.   FINANCIAL STATEMENTS AND NOTES                                       
                                                                        
                                  SUGEN, Inc.
                                                                        
                            CONDENSED BALANCE SHEETS
                                 (In thousands)
                                                                        

                                                         June 30,   December 31,
                                                           1997         1996  
                                                         ---------    ---------
ASSETS                                                  (unaudited)
Current assets:
        Cash and cash equivalents                        $   8,185    $  24,852
        Short-term investments                              34,679       31,482
        Accounts receivable                                    178          264
        Prepaid expenses and other current assets              690          468
                                                         ---------    ---------
                Total current assets                        43,732       57,066

Property and equipment, net                                  4,000        4,095
Other assets                                                   981          775
                                                         ---------    ---------
                                                         $  48,713    $  61,936
                                                         =========    =========

LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
        Accounts payable                                 $   2,558    $     852
        Accrued liabilities                                  6,789        7,406
        Deferred contract revenue                              375          375
        Capital lease obligations - current portion          2,123        1,835
                                                         ---------    ---------
                Total current liabilities                   11,845       10,468

Capital lease obligations - non-current portion              3,226        2,938

Stockholders' equity:
        Common stock                                       108,700      108,120
        Deferred compensation                                 (560)        (710)
        Note receivable from stockholder                      (883)        (883)
        Accumulated deficit                                (73,615)     (57,997)
                                                         ---------    ---------
                Total stockholders' equity                  33,642       48,530
                                                         ---------    ---------
                                                         $  48,713    $  61,936
                                                         =========    =========

                            See accompanying notes.


                                        3

<PAGE>


<TABLE>
                                                            SUGEN, Inc.
                                                                                                                
                                                      STATEMENTS OF OPERATIONS
                                              (In thousands, except per share amounts)
                                                            (unaudited)


<CAPTION>
                                                                      Three Months Ended                     Six Months Ended    
                                                                            June 30,                              June 30,       
                                                                  ---------------------------           ---------------------------
                                                                    1997               1996               1997               1996  
                                                                  --------           --------           --------           --------
<S>                                                               <C>                <C>                <C>                <C>     
Contract revenue (includes amounts from
   related party)                                                 $  1,484           $  4,429           $  2,971           $  7,908

Costs and expenses:
        Research and development                                     8,570              7,717             16,576             14,332
        General and administrative                                   1,512              1,587              2,990              2,967
                                                                  --------           --------           --------           --------
           Total costs and expenses                                 10,082              9,304             19,566             17,299
                                                                  --------           --------           --------           --------

Operating loss                                                      (8,598)            (4,875)           (16,595)            (9,391)

Other income and expenses:
        Interest income                                                610                598              1,303              1,288
        Interest expense                                              (174)              (174)              (344)              (354)
                                                                  --------           --------           --------           --------
           Other income, net                                           436                424                959                934
                                                                  --------           --------           --------           --------
Net loss                                                          $ (8,162)          $ (4,451)          $(15,636)          $ (8,457)
                                                                  ========           ========           ========           ========


Net loss per share                                                $  (0.62)          $  (0.42)          $  (1.20)          $  (0.81)
                                                                  ========           ========           ========           ========

Shares used in computing net loss
  per share                                                         13,079             10,500             13,050             10,486
                                                                  ========           ========           ========           ========

<FN>
                                                      See accompanying notes.
</FN>
</TABLE>

                                                                 4

<PAGE>


<TABLE>
                                                            SUGEN, Inc.

                                                 CONDENSED STATEMENTS OF CASH FLOWS
                                          Increase (decrease) in cash and cash equivalents
                                                           (In thousands)
                                                            (unaudited)

<CAPTION>
                                                                                                           Six Months Ended
                                                                                                                June 30,
                                                                                                     ------------------------------
                                                                                                       1997                  1996
                                                                                                     --------              --------
<S>                                                                                                  <C>                   <C>      
Cash flows from operating activities
Net loss                                                                                             $(15,636)             $ (8,457)
Adjustments to reconcile net loss to net cash used in
        operating activities:
        Depreciation and amortization                                                                   1,500                 1,080
        Deferred revenue                                                                                 --                  (4,942)
        Changes in operating assets and liabilities:
          Prepaid expenses and other current assets                                                      (136)                  199
          Other assets                                                                                   (206)                 (789)
          Accounts payable                                                                              1,706                 1,143
          Accrued liabilities                                                                            (617)                1,729
                                                                                                     --------              --------
Net cash used in operating activities                                                                 (13,389)              (10,037)
                                                                                                     --------              --------

Cash flows from investing activities
Sales/maturities (purchases) of short-term investments, net                                            (3,179)               13,705
Purchases of property and equipment, net                                                               (1,255)                 (666)
                                                                                                     --------              --------
Net cash provided by (used in) investing activities                                                    (4,434)               13,039
                                                                                                     --------              --------

Cash flows from financing activities
Proceeds from issuance of common stock, net                                                               580                   424
Repurchase of common stock                                                                               --                  (2,698)
Proceeds from issuance of warrant                                                                        --                     200
Proceeds from lease financing of property and equipment                                                 1,534                   632
Payments under capital lease obligations                                                                 (958)                 (673)
                                                                                                     --------              --------
Net cash provided by (used in) financing activities                                                     1,156                (2,115)
                                                                                                     --------              --------

Net increase (decrease) in cash and cash equivalents                                                  (16,667)                  887
Cash and cash equivalents at beginning of period                                                       24,852                 8,226
                                                                                                     --------              --------
Cash and cash equivalents at end of period                                                           $  8,185              $  9,113
                                                                                                     ========              ========

<FN>
                                                      See accompanying notes.
</FN>
</TABLE>

                                                                 5

<PAGE>


                                   SUGEN, Inc.

                          NOTES TO FINANCIAL STATEMENTS

                                   (Unaudited)


1.   Summary of Significant Accounting Policies

     Basis of Presentation

     The  financial  information  at June 30, 1997 and for the six months  ended
     June  30,  1997  and  1996  is  unaudited  but  includes  all   adjustments
     (consisting only of normal recurring  adjustments)  which SUGEN,  Inc. (the
     "Company")  considers  necessary for the fair presentation of the financial
     position  at such date and the  operating  results and cash flows for those
     periods. The accompanying  condensed financial statements should be read in
     conjunction  with the financial  statements  and notes thereto for the year
     ended December 31, 1996 included in the Company's Form 10-K. The results of
     the  Company's  operations  for any  interim  period  are  not  necessarily
     indicative  of the results of the  Company's  operations  for a full fiscal
     year.

     Change in Method of Computing Earnings Per Share

     In February 1997, the Financial  Accounting  Standards  Board (FASB) issued
     Statement of Financial  Accounting  Standards No. 128,  Earnings Per Share.
     Effective  December 31, 1997, the Company will adopt Statement of Financial
     Accounting  Standards No. 128,  Earnings Per Share.  In accordance with the
     Statement,  the Company  would be  required to change the method  currently
     used to compute  earnings  per share and  restate  all prior  periods.  The
     impact of Statement 128 on the  calculation of basic and dilutive  earnings
     per  share is  expected  to have no  impact on the net loss per share to be
     presented at year end.


2.   Accrued Liabilities

     The components of accrued liabilities consist of the following:

                                                    June 30,   December 31,
                                                      1997         1996
                                                     ------       ------
                                                       (In thousands)

Accrued research & development services              $3,586       $3,724
Accrued compensation                                    962          883
Accrued professional fees                               516          524
Other                                                 1,725        2,275
                                                     ------       ------
                                                     $6,789       $7,406
                                                     ======       ======
                                                            
3.   Facility Lease Agreement

     In June 1997,  the  Company  entered  into a seventeen  year  build-to-suit
     facility lease agreement for an approximately 100,000 square foot facility.
     Construction  of the new  facility is  currently  targeted  for  completion
     during the fourth quarter of 1998,  which  coincides with the expiration of
     the Company's current lease facilities.  Annual rental  commitments for the
     building (including owner financed  improvements) over the first five years
     range from $2.4 million to $3.4 million per year. In addition,  the Company
     issued  warrants to purchase  Common  Stock in  connection  with this lease
     agreement.

                                        6

<PAGE>


                                   SUGEN, Inc.

Item 2.   MANAGEMENT'S DISCUSSION AND ANALYSIS
          OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS


     In addition to  historical  information  contained  herein,  the  following
discussion contains words such as "intends," "believes," "anticipates," "plans,"
"expects" and similar expressions which are intended to identify forward-looking
statements that involve risks and  uncertainties.  The Company's  actual results
could differ  significantly from the results discussed in these  forward-looking
statements.  Factors that could cause or contribute to such differences  include
the factors  discussed  below as well as the factors  discussed in the Company's
Form 10-K for the year ended  December 31, 1996.  Readers are  cautioned  not to
place undue reliance on these forward-looking statements, which speak only as of
the date hereof.  The Company undertakes no obligation to release the results of
any revision to these  forward-looking  statements  which may be made to reflect
events or  circumstances  occurring  after the date  hereof  or to  reflect  the
occurrence of unanticipated events.


Overview

     SUGEN was founded in July 1991 to discover and develop new classes of small
molecule drugs which interact in a specific manner with different members of the
tyrosine kinase,  serine-threonine  kinase and tyrosine  phosphatase families of
signal transduction  pathways.  These pathways are involved in a number of human
diseases including cancer and diabetes as well as disorders of the body's immune
defenses  and  neurological  systems.  SUGEN's  most  advanced  drug in clinical
development is SU101, a PDGF receptor antagonist,  that is currently in Phase II
testing  in  malignant  glioma  and Phase  I-II in  prostate,  ovarian  and lung
cancers.  In addition to SU101, the Company has SU5271 (EGF receptor  inhibitor)
in Phase I clinical  studies for the  treatment  of  psoriasis  and has recently
filed an Investigational  New Drug ("IND")  application for a Flk-1 angiogenesis
inhibitor.  Through June 30, 1997, all of the Company's  revenue has been earned
pursuant  to  collaborations  with  Zeneca  Limited   ("Zeneca"),   ASTA  Medica
Aktiengesellschaft ("ASTA Medica"), Vision Pharmaceuticals L.P., an affiliate of
Allergan,  Inc. and  Allergan,  Inc.  (collectively  "Allergan")  and Amgen Inc.
("Amgen").   The  Company   intends  to  pursue  its  drug  discovery   programs
independently and in collaboration with established pharmaceutical companies.

     The  financial  results  for the six  months  ended June 30,  1997  reflect
planned increases in operating expenses necessary for advancing multiple product
candidates through the development  process. The Company has not been profitable
since  inception  and expects to incur  substantial  losses for the  foreseeable
future,  primarily due to the expansion of preclinical and clinical  development
activities as more of its proprietary  cancer-related  programs  progress toward
and into the clinic. The Company expects that losses will fluctuate from quarter
to quarter and that such  fluctuations may be substantial.  As of June 30, 1997,
the Company's accumulated deficit was $73.6 million.


Results of Operations

     The  Company's  revenues  for the three and six months  ended June 30, 1997
were $1.5  million and $3.0  million,  respectively.  These  results  compare to
revenues  of $4.4  million  and $7.9  million  for the same  periods  last year.
Revenues  for the three and six months  ended June 30,  1997  included  contract
revenue  from the  Allergan  and Zeneca  collaborations  and  contract  services
revenue earned under the ASTA Medica collaboration for  non-collaboration  work.
In addition to contract  revenues  earned  from  existing  collaborations,  1996
revenues included set-up fees associated with the ASTA Medica  collaboration and
wind-down fees in connection  with the  termination  of the Amgen  collaboration
agreement. The Company recognizes revenue from set-up fees and wind-down fees as
the related  activities  are  performed,  which is generally over a twelve-month
period or less.  Through  December 31, 1996,  the set-up and wind-down fees from
the  ASTA  Medica  and  Amgen  collaborations,   respectively,  had  been  fully
recognized as revenue. Going forward, the Company will

                                       7

<PAGE>


not recognize any  additional  revenue  under the Amgen  collaboration  and will
recognize  additional revenue under the ASTA Medica  collaboration only upon the
achievement of specified  milestones and for contract  services provided by ASTA
Medica for  non-collaboration  work.  As a result,  1997  contract  revenue will
continue  to be lower  than  1996 in the  absence  of  additional  collaboration
agreements  during  the  year.  The  Company  is  actively  pursuing  additional
collaborations,  but no assurance  can be given as to the ability of the Company
to enter such collaborations on a timely basis or at all.

     Research  and  development  expenses  increased  to $8.6  million and $16.6
million for the three and six months  ended June 30,  1997,  respectively,  from
$7.7  million and $14.3  million for the same  periods  last year.  The increase
during 1997 was primarily due to higher personnel  related costs associated with
the expansion of the Company's research and development  programs.  In addition,
the progression of clinical activities,  including expanded Phase I and Phase II
studies of the Company's lead anti-cancer compound, SU101, and the initiation of
clinical  studies under the Company's  psoriasis  program  contributed to higher
expenses during 1997.  Further,  the continued  advancement of multiple programs
through preclinical  development,  including costs associated with the Company's
June  1997 IND  filing  with the Food and Drug  Administration  ("FDA")  for its
Flk-1/KDR angiogenesis inhibitor, led to higher expenses in the first six months
of 1997.

     General and administrative expenses for the three and six months ended June
30, 1997 were $1.5 million and $3.0 million,  respectively, and approximated the
level of spending  during the same periods last year.  The Company  expects that
its general and administrative expenses will increase in future periods in order
to support the Company's research and development efforts.

     Interest  income  for the three and six  months  ended  June 30,  1997 were
$610,000 and $1.3 million,  respectively.  The Company  earned  slightly  higher
interest income during 1997, despite the decline in interest rates from the same
period last year,  due to higher  investment  balances  arising  primarily  from
issuances of the Company's capital stock. Interest expense for the three and six
months ended June 30, 1997 were  $174,000 and $344,000,  respectively.  Although
consistent  on a quarterly  basis from the same period last year,  for the first
half of 1997, interest expense was slightly below the prior year level primarily
due to the scheduled  termination of some of the Company's  leases.  The Company
expects  that  interest  expense  will  increase  in future  periods  due to the
continued   use  of  capital   lease   financing   for  equipment  and  facility
improvements.


Liquidity and Capital Resources

     The  Company had cash,  cash  equivalents  and  short-term  investments  of
approximately  $42.9 million at June 30, 1997, compared with approximately $56.3
million at December 31, 1996.  The decrease in cash and  investments  during the
six months ended June 30, 1997 was  primarily  due to the net loss for the first
six months.

     Through June 30, 1997,  the Company's  principal  sources of financing have
been its initial and follow-on public  offerings of Common Stock,  placements of
the Company's  Preferred and Common Stock and funds received under the Company's
corporate  collaborations.  The Company's current principal sources of liquidity
are its research and  development  collaborations  with ASTA Medica,  Zeneca and
Allergan,  its cash,  cash  equivalents  and short-term  investments  and income
earned  thereon as well as capital lease  financing.  In March 1997, the Company
secured a capital  lease line in the amount of $3.5  million for the purchase of
equipment and  facilities  improvements.  At June 30, 1997, the Company had $2.6
million available under this line.

     The Company has entered into license and  research  agreements  whereby the
Company funds research  projects  performed by others or  in-licenses  compounds
from third  parties.  Some of the  agreements  may  require  the Company to make
milestone and royalty payments.  Under these programs,  commitments for external
research  funding  are  approximately  $2.7  million in 1997.  A number of these
agreements expire in late 1997. However, the Company anticipates renewing most

                                        8

<PAGE>


of these agreements which may increase future  commitments of the Company.  Most
of these commitments are cancelable within a three to six month period and limit
the amounts  payable by the Company for  sponsored  research  under the programs
after notice of cancellation by the Company.

     From  time  to  time,  the  Company  evaluates  potential   investments  in
complementary  businesses,  products or technologies.  Currently, the Company is
considering modest investments in such complementary businesses during 1997. The
Company  has no other  present  undertakings,  commitments  or  agreements  with
respect to investments in other businesses.

     Net additions of equipment and  leasehold  improvements  for the six months
ended  June 30,  1997 and 1996 were $1.3  million  and  $666,000,  respectively.
Capital additions during the first half of 1997 included the initial phases of a
limited  facility  expansion  and the  continued  investment  in  enhancing  the
Company's  laboratory  capabilities.   The  Company  expects  that  its  capital
additions  for 1997 will be higher than that of the prior year  primarily due to
anticipated  facility  improvements  to its  laboratory  and office  space.  The
Company intends to fund future capital expenditures,  including those associated
with the  build-to-suit  facility  discussed  below,  principally  through lease
financing  or other debt  arrangements.  Accordingly,  it is  expected  that the
Company's capital lease obligations and related interest expense, as well as its
depreciation expense, will increase in future periods.

     In June 1997,  the Company  entered  into a  build-to-suit  facility  lease
agreement.  Construction  of the new facility is targeted for completion  during
the fourth quarter of 1998, which coincides with the expiration of the Company's
current  facility  leases.  Although  the Company has not  expended  significant
amounts to date,  the  Company  expects to invest in facility  improvements  and
incur move related costs during 1998 as it approaches building completion.

     The Company  estimates that its existing capital  resources,  together with
facility  and  equipment  financing,   anticipated  revenues  from  its  current
collaborations and net income from investment activities,  will be sufficient to
fund its planned  operations  into late 1998. The Company  anticipates  that the
funds from future  collaborations will extend this time period.  However,  there
can be no assurance that the Company will enter into any such collaborations. In
addition,  there  can be no  assurance  that the  underlying  assumed  levels of
revenue and expense will prove accurate.  Whether or not these assumptions prove
to be accurate, the Company will need to raise substantial additional capital to
fund its operations. The Company intends to seek such additional funding through
collaborative  arrangements,  public or private  equity or debt  financings  and
capital lease transactions;  however,  there can be no assurance that additional
financing will be available on acceptable  terms or at all. If additional  funds
are raised by issuing equity  securities,  further  dilution to stockholders may
result.  In addition,  in the event that additional  funds are obtained  through
arrangements with  collaborative  partners or other partners,  such arrangements
may  require the Company to  relinquish  rights to certain of its  technologies,
product  candidates or products that the Company would otherwise seek to develop
or commercialize itself. If adequate funds are not available, the Company may be
required to delay,  reduce the scope of or eliminate one or more of its research
or  development  programs,  which  could have a material  adverse  effect on the
Company.

     The Company is at an early stage of  development  and must be  evaluated in
light of the uncertainties and complications present in a biotechnology company.
The  Company  has  been in  existence  only  since  1991  and to date  two  drug
candidates  (SU101 and SU5271) have entered  human  clinical  testing,  with the
Company's  third drug  candidate (a Flk-1  angiogenesis  inhibitor)  expected to
follow based on its recent IND filing.  To achieve  profitable  operations  on a
continuing  basis,  the  Company,  alone or with  collaborative  partners,  must
successfully develop,  manufacture,  introduce and market its proposed products.
Products, if any, resulting from the Company's research and development programs
are not expected to be  commercially  available  for a number of years,  even if
they are  developed  successfully  and proven to be safe and  effective.  Before
obtaining  regulatory  clearance for the commercial  sale of any of its products
under development,  the Company must demonstrate through preclinical studies and
clinical  trials that the potential  product is safe and  efficacious for use in
humans for each target indication. The failure to adequately demonstrate the

                                        9

<PAGE>


safety and  efficacy  of a product  under  clinical  development  could delay or
prevent regulatory  clearance of the potential product and could have a material
adverse effect on the Company.  In addition,  several of the Company's currently
proposed products are subject to development and licensing arrangements with the
Company's collaborators. Therefore, the Company is dependent on the research and
development  efforts of these collaborators with respect to some of its proposed
products and is entitled  only to a portion of the  revenues,  if any,  realized
from  the  commercial  sale  of any of the  potential  products  covered  by the
collaborations in many  jurisdictions.  The Company has experienced  significant
operating losses since its inception.  The Company expects to incur  significant
operating  losses at least for the next  several  years and  expects  cumulative
losses to increase as the Company's research and development efforts,  including
preclinical and clinical testing, are expanded. All of the Company's revenues to
date have been  received  pursuant to the Company's  collaborations  or interest
income from cash, cash equivalent and short term investments. Should the Company
or its  collaborators  fail to  perform in  accordance  with the terms of any of
their agreements, any consequent loss of revenue under the agreements could have
a material adverse effect on the Company's results of operations.  The foregoing
risks reflect the  Company's  early stage of  development  and the nature of the
Company's industry and potential products.  Also inherent at the Company's stage
of  development  are  a  range  of  additional  risks,  including  manufacturing
uncertainties,   the  Company's  lack  of  sales  and  marketing   capabilities,
competition,  uncertainties  regarding  protection  of patents  and  proprietary
rights, government regulation and uncertainties regarding pharmaceutical pricing
and reimbursement.

                                       10

<PAGE>


                           PART II. OTHER INFORMATION



Item 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

(a.) On May 21, 1997, the Company held its Annual Meeting of  Stockholders.  The
     following actions were taken at the meeting:

(b.) The  following  four  directors  were each  elected for a  three-year  term
     expiring at the 2000 Annual Meeting of Stockholders:

         1.  9,570,889 shares voted in favor of Charles M. Hartman,  and 361,575
             shares withheld their vote;
         2.  9,435,409  shares voted in favor of Donald E. Nickelson and 497,055
             shares withheld their vote;
         3.  9,566,487 shares voted in favor of Bruce R. Ross and 365,977 shares
             withheld their vote;
         4.  9,569,189 shares voted in favor of Richard D. Spizzirri and 363,275
             shares withheld their vote.

     The following individuals' terms of office as directors continued after the
     meeting:

              Jeremy Curnock Cook
              Stephen Evans-Freke
              Anthony B. Evnin, Ph.D.
              Heinrich Kuhn
              Axel Ullrich, Ph.D.
              Glenn Utt
              Michael Wall

(c.)
     1.      A proposal  to approve an  amendment  to the  Company's  1992 Stock
             Option Plan, as amended, to increase the aggregate number of shares
             of Common Stock available for issuance by 650,000 shares: 8,761,630
             shares were voted in favor of the proposal,  1,131,071  shares were
             voted against the proposal, 39,763 shares abstained and zero shares
             were broker non-votes.

     2.      The  ratification  the  selection  of  Ernest &  Young,  LLP as the
             Company's  independent  auditors:  9,885,859  shares  were voted in
             favor  of the  proposal,  39,155  shares  were  voted  against  the
             proposal,  7,450  shares  abstained  and zero  shares  were  broker
             non-votes.

                                       11

<PAGE>


Item 6.   EXHIBITS AND REPORTS ON FORM 8-K

(a)      Exhibits

 Exhibit Number                      Description
 --------------                      -----------
     3.1          Restated Certificate of Incorporation (2)
     3.2(ii)      Bylaws of the Registrant (1)
     3.3          Certificate of  Designation  of Series A Junior  Participating
                     Preferred Stock of the Registrant (3)
     10.63+       Build-To-Suit  Lease Agreement,  dated June 11, 1997,  between
                     the   Registrant   and   Britannia   Pointe  Grand  Limited
                     Partnership.
     10.64+       Form of Warrant for the Purchase of Common  Stock,  dated June
                     30,  1997,  issued  in the  connection  with  Build-To-Suit
                     Lease. Agreement filed as Exhibit 10.63.
     10.65+       Second  Amended and Restated  Research and License  Agreement,
                     dated June 30, 1997,  between the  Registrant  and New York
                     University.
     10.66+       Termination notice, dated June 1, 1997, between the Registrant
                     and  Yissum  Research  Development  Company  of The  Hebrew
                     University of Jerusalem.
     27           Financial Data Schedule

- -----------------------
   +     The  Registrant  has requested  confidential  treatment with respect to
             portions of this Exhibit.
  (1)    Incorporated  by reference to  identically  numbered  exhibits filed in
             response  to  Item  16  "Exhibits"  of the  Company's  Registration
             Statement  on Form S-1, as amended  (File Number  33-77074),  which
             became effective October 4, 1994.
  (2)    Incorporated  by reference to  identically  numbered  exhibits filed in
             response to Item 14 "Exhibits"  of the  Company's  Annual Report of
             Form 10-K for the year ended December 31, 1994.
  (3)    Filed as an exhibit to the Form 8-K Current  Report dated July 26, 1995
             and incorporated herein by reference.


(b)      Reports on Form 8-K

         No  reports on Form 8-K were filed  during the  quarter  ended June 30,
         1997.

                                       12

<PAGE>


                                   SUGEN, Inc.

                                   SIGNATURES


Date:    August 12, 1997                           SUGEN, Inc.




By: /s/ Stephen Evans-Freke                      By: /s/ Christine E. Gray-Smith
   ---------------------------                      ----------------------------
    Stephen Evans-Freke                              Christine E. Gray-Smith
    Chairman and                                     Vice President, Finance
    Chief Executive Officer                          (Principal Financial and
                                                     Accounting Officer)

                                       13

<PAGE>


                                   SUGEN, Inc.

                                  EXHIBIT INDEX


   Exhibit Number                      Description
   --------------                      -----------
         3.1      Restated Certificate of Incorporation (2)
         3.2(ii)  Bylaws of the Registrant (1)
         3.3      Certificate of  Designation  of Series A Junior  Participating
                     Preferred Stock of the Registrant (3)
         10.63+   Build-To-Suit  Lease Agreement,  dated June 11, 1997,  between
                     the   Registrant   and   Britannia   Pointe  Grand  Limited
                     Partnership.
         10.64+   Form of Warrant for the Purchase of Common  Stock,  dated June
                     30,  1997,  issued  in the  connection  with  Build-To-Suit
                     Lease. Agreement filed as Exhibit 10.63.
         10.65+   Second  Amended and Restated  Research and License  Agreement,
                     dated June 30, 1997,  between the  Registrant  and New York
                     University.
         10.66+   Termination notice, dated June 1, 1997, between the Registrant
                     and  Yissum  Research  Development  Company  of The  Hebrew
                     University of Jerusalem.
         27       Financial Data Schedule

- ---------------------
       +        The Registrant has requested confidential treatment with respect
                     to portions of this Exhibit.
      (1)       Incorporated by reference to identically numbered exhibits filed
                     in  response  to  Item  16   "Exhibits"  of  the  Company's
                     Registration Statement on Form S-1, as amended (File Number
                     33-77074), which became effective October 4, 1994.
      (2)       Incorporated by reference to identically numbered exhibits filed
                     in response to Item 14 "Exhibits"  of the Company's  Annual
                     Report of Form 10-K for the year ended December 31, 1994.
      (3)       Filed as an exhibit to the Form 8-K  Current  Report  dated July
                     26, 1995 and incorporated herein by reference.

                                       14




                                                                   EXHIBIT 10.63


                                           *** TEXT OMITTED AND FILED SEPARATELY
                                                CONFIDENTIAL TREATMENT REQUESTED
                                             UNDER 17 C.F.R. SS.SS.200.80(B)(4),
                                                            200.83 AND 240.24B-2


                               BUILD-TO-SUIT LEASE



Landlord:                  Britannia Pointe Grand Limited Partnership


Tenant:                    SUGEN, Inc.

Date:                      June 11, 1997




                                TABLE OF CONTENTS


1.  PROPERTY.................................................................  1
1.1      Lease of Property...................................................  1
1.2      Landlord's Reserved Rights..........................................  2

2.  TERM.....................................................................  3
2.1      Term................................................................  3
2.2      Early Possession....................................................  3
2.3      Delay In Possession.................................................  4
2.4      Acknowledgement Of Rent Commencement................................  5
2.5      Holding Over........................................................  5
2.6      Option To Extend Term...............................................  5
2.7      Extension of Initial Term...........................................  6

3.  RENTAL...................................................................  6
3.1      Minimum Rental......................................................  6
         (a)      Rental Amounts.............................................  6
         (b)      Rental Adjustment Due to Change in Square Footage..........  7
         (c)      Rental Adjustment in Connection with Cost of Improvements..  7



<PAGE>


         (d)      Rental Adjustment Due to Deferral of Tenant Improvements...  9
         (e)      Rental Amounts During First Extended Term..................  9
         (f)      Rental Amounts During Second Extended Term................. 10
3.2      Late Charge......................................................... 10

4.  STOCK WARRANTS........................................................... 11
4.1      Stock Warrants...................................................... 11

5.  CONSTRUCTION............................................................. 13
5.1      Construction of Improvements........................................ 13
5.2      Condition of Property............................................... 13
5.3      Compliance with Law................................................. 14

6.  EXPANSION OPTIONS........................................................ 15
6.1      Adjacent Property Lock-Up........................................... 15
6.2      Lock-Up Consideration............................................... 15
6.3      Exercise of Phase II Expansion Options.............................. 16

7.  REFUSAL RIGHTS WITH RESPECT TO LEASES.................................... 18
7.1      Refusal Rights...................................................... 18

8.  TAXES.................................................................... 20
8.1      Personal Property................................................... 20
8.2      Real Property....................................................... 20

9.  OPERATING EXPENSES....................................................... 21
9.1      Payment Of Operating Expenses....................................... 21
9.2      Definition Of Operating Expenses.................................... 21
9.3      Determination Of Operating Expenses................................. 24
9.4      Final Accounting For Lease Year..................................... 25
9.5      Proration........................................................... 25

10.  UTILITIES............................................................... 26
10.1     Payment............................................................. 26
10.2     Interruption........................................................ 26

11.  ALTERATIONS; SIGNS...................................................... 26
11.1     Right To Make Alterations........................................... 26
11.2     Title To Alterations................................................ 27
11.3     Tenant Fixtures..................................................... 28
11.4     No Liens............................................................ 28


<PAGE>


11.5     Signs............................................................... 28

12.  MAINTENANCE AND REPAIRS................................................. 29
12.1     Landlord's Work..................................................... 29
12.2     Tenant's Obligation For Maintenance................................. 29
         (a)      Good Order, Condition And Repair........................... 29
         (b)      Landlord's Remedy.......................................... 30
         (c)      Condition Upon Surrender................................... 30

13.  USE OF PROPERTY......................................................... 30
13.1     Permitted Use....................................................... 30
13.2     [Omitted.].......................................................... 31
13.3     No Nuisance......................................................... 31
13.4     Compliance With Laws................................................ 31
13.5     Liquidation Sales................................................... 31
13.6     Environmental Matters............................................... 32

14.  INSURANCE AND INDEMNITY................................................. 36
14.1     Insurance........................................................... 36
14.2     Quality Of Policies And Certificates................................ 38
14.3     Workers' Compensation............................................... 38
14.4     Waiver Of Subrogation............................................... 38
14.5     Increase In Premiums................................................ 38
14.6     Indemnification..................................................... 39
14.7     Blanket Policy...................................................... 39

15.  SUBLEASE AND ASSIGNMENT................................................. 40
15.1     Assignment And Sublease Of Property................................. 40
15.2     Rights Of Landlord.................................................. 40

16.  RIGHT OF ENTRY AND QUIET ENJOYMENT...................................... 42
16.1     Right Of Entry...................................................... 42
16.2     Quiet Enjoyment..................................................... 42

17.  CASUALTY AND TAKING..................................................... 42
17.1     Damage or Destruction............................................... 42
17.2     Condemnation........................................................ 44
17.3     Reservation Of Compensation......................................... 45
17.4     Restoration Of Improvements......................................... 45

18.  DEFAULT................................................................. 45


<PAGE>


18.1     Events Of Default................................................... 45
         (a)      [Omitted.]................................................. 45
         (b)      Nonpayment................................................. 46
         (c)      Other Obligations.......................................... 46
         (d)      General Assignment......................................... 46
         (e)      Bankruptcy................................................. 46
         (f)      Receivership............................................... 46
         (g)      Attachment................................................. 46
         (h)      Insolvency................................................. 47
18.2     Remedies Upon Tenant's Default...................................... 47
18.3     Remedies Cumulative................................................. 48

19.  SUBORDINATION, ATTORNMENT AND SALE...................................... 48
19.1     Subordination To Mortgage........................................... 48
19.2     Sale Of Landlord's Interest......................................... 49
19.3     Estoppel Certificates............................................... 49
19.4     Subordination to CC&R's............................................. 50
19.5     Mortgagee Protection................................................ 50

20.  SECURITY................................................................ 51
20.1     Deposit............................................................. 51

21.  MISCELLANEOUS........................................................... 52
21.1     Notices............................................................. 52
21.2     Successors And Assigns.............................................. 53
21.3     No Waiver........................................................... 53
21.4     Severability........................................................ 53
21.5     Litigation Between Parties.......................................... 53
21.6     Surrender........................................................... 54
21.7     Interpretation...................................................... 54
21.8     Entire Agreement.................................................... 54
21.9     Governing Law....................................................... 54
21.10    No Partnership...................................................... 54
21.11    Financial Information............................................... 54
21.12    Costs............................................................... 55
21.13    Time................................................................ 55
21.14    Rules And Regulations............................................... 55
21.15    Brokers............................................................. 55
21.16    Memorandum Of Lease................................................. 56
21.17    Corporate Authority................................................. 56
21.18    Execution and Delivery.............................................. 56


<PAGE>



21.19    Survival............................................................ 56


                                    EXHIBITS
                                    --------

         EXHIBIT A            Real Property Descriptions (Property and Center)

         EXHIBIT B            Site Plan

         EXHIBIT C            Workletter

         EXHIBIT D            Estimated Construction Schedule

         EXHIBIT E            Acknowledgement of Rent Commencement Date


<PAGE>


                               BUILD-TO-SUIT LEASE


                  THIS BUILD-TO-SUIT LEASE ("Lease") is made and entered into as
of June 11, 1997, by and between BRITANNIA POINTE GRAND LIMITED  PARTNERSHIP,  a
Delaware  limited  partnership   ("Landlord"),   and  SUGEN,  INC.,  a  Delaware
corporation ("Tenant").


                          THE PARTIES AGREE AS FOLLOWS:


                                   1. PROPERTY

         1.1      Lease of Property.

                  (a) Landlord leases to Tenant and Tenant hires and leases from
Landlord,  on the terms,  covenants and conditions  hereinafter  set forth,  the
building (the "Initial Building") to be constructed pursuant to Article 5 hereof
and Exhibit C attached  hereto on the real property  described as "The Property"
in Exhibit A attached hereto (the "Property"),  to consist of a two-story office
and laboratory  building  containing  approximately  [...*...]  square feet. The
location of the Initial Building on the Property is intended to be substantially
as shown for the  building  designated  as "Initial  Building"  on the site plan
attached  hereto as Exhibit B (the "Site  Plan").  The  Property  is part of the
Britannia  Pointe Grand Business Park (the "Center") on East Grand Avenue in the
City of South San Francisco,  County of San Mateo,  State of  California,  which
presently  consists of the real property  described as "The Center" in Exhibit A
attached  hereto and  presently  includes the existing  buildings  designated as
Buildings  D,  E, F and G on  the  Site  Plan  (containing,  in  the  aggregate,
approximately  [...*...]  square  feet of office and  research  and  development
space). The Initial Building and the other improvements to be constructed on the
Property  pursuant to Article 5 hereof and Exhibit C attached hereto,  partly by
Landlord and partly by Tenant, are sometimes referred to collectively  herein as
the "Improvements." The parking areas,  driveways,  sidewalks,  landscaped areas
and other  portions of the Center that lie  outside  the  exterior  walls of the
buildings now existing or to be  constructed  in the Center,  as depicted in the
Site Plan and as hereafter  modified by Landlord from time to time in accordance
with the  provisions  of this  Lease,  are  sometimes  referred to herein as the
"Common Areas."

                  (b) As an  appurtenance  to  Tenant's  leasing of the  Initial
Building pursuant to Section 1.1(a),  Landlord hereby grants to Tenant,  for the
benefit  of  Tenant  and  its  employees,  suppliers,  shippers,  customers  and
invitees,  during the term of this  Lease,  the  non-exclusive  right to use, in
common with others  entitled to such use, (i) those portions of the Common Areas
improved  from  time to time for use as  parking  areas,  driveways,  sidewalks,
landscaped areas,


- ---------------------------
*CONFIDENTIAL TREATMENT REQUESTED
                                        1

<PAGE>


or for other common  purposes,  and (ii) all access easements and similar rights
and privileges  relating to or appurtenant to the Center and created or existing
from  time to  time  under  any  access  easement  agreements,  declarations  of
covenants,  conditions  and  restrictions,  or other written  agreements  now or
hereafter  of  record  with  respect  to  the  Center,  subject  however  to any
limitations applicable to such rights and privileges under applicable law, under
this  Lease  and/or  under the  written  agreements  creating  such  rights  and
privileges.  Landlord  represents  that the Property,  in  conjunction  with the
balance of the Center,  shall  include  parking  spaces  available for use (on a
non-exclusive  basis) by Tenant and its  employees,  agents and  invitees at the
rate of at least 3.5 spaces per 1,000  square  feet of building  area,  and that
Tenant  shall be  entitled  to have  ten (10)  parking  spaces  marked  as being
reserved for exclusive use by Tenant, at a location to be reasonably  designated
by Tenant and approved by Landlord  (which  approval  shall not be  unreasonably
withheld or delayed) at an appropriate  time in the course of the development of
Common Area plans and Initial  Building  plans pursuant to Article 5 and Exhibit
C.

         1.2 Landlord's  Reserved Rights. To the extent reasonably  necessary to
permit Landlord to exercise any rights of Landlord and discharge any obligations
of Landlord  under this Lease,  Landlord shall have, in addition to the right of
entry set forth in  Section  16.1  hereof,  the  following  rights:  (i) to make
changes to the  Common  Areas,  including,  without  limitation,  changes in the
location,  size or shape of any  portion of the Common  Areas,  and to  relocate
parking  spaces in the Center (but not  materially  decrease  the number of such
parking  spaces  in  areas  of the  Center  generally  adjacent  to the  Initial
Building);  (ii) to close temporarily any of the Common Areas for maintenance or
other  reasonable  purposes,  provided that  reasonable  parking and  reasonable
access to the Initial Building remain  available;  (iii) to construct,  alter or
add to any  improvements  in the Common Areas of the Center,  and to  construct,
alter or add to buildings and Common Area improvements in the Center (including,
but not limited to,  construction of buildings in the areas designated as future
buildings C and H on the Site Plan, and  construction of site  improvements  and
Common Area improvements in adjacent  portions of the Center);  (iv) to build in
areas adjacent to the Center and to add such areas to the Center; (v) to use the
Common  Areas  while  engaged  in making  additional  improvements,  repairs  or
alterations  to the Center or any  portion  thereof;  and (vi) to do and perform
such  other  acts with  respect  to the  Common  Areas and the  Center as may be
necessary or appropriate;  provided,  however, that notwithstanding  anything to
the contrary in this Section 1.2,  Landlord's  exercise of its rights  hereunder
shall not cause any material  diminution  of Tenant's  rights,  nor any material
increase  of  Tenant's  obligations,  under  this  Lease or with  respect to the
Improvements.


                                        2

<PAGE>



                                     2. TERM

         2.1      Term.

                  (a)  The  term  of  this  Lease  shall  commence  upon  mutual
execution  of this Lease by Landlord  and Tenant.  Tenant's  minimum  rental and
Operating  Expense  obligations  shall  commence  on the earlier of (i) the date
which is one  hundred  eighty  (180) days after the date  Landlord  delivers  to
Tenant a Structural  Completion  Certificate pursuant to the Workletter attached
hereto as Exhibit C (subject to any adjustments authorized or required under the
provisions of such Exhibit C), notifying Tenant that Landlord's  construction of
the  shell of the  Initial  Building  pursuant  to  Article  5 and  Exhibit C is
substantially complete, or (ii) the date Tenant takes occupancy of and commences
operation  of its  business in the Initial  Building,  the earlier of such dates
being herein called the "Rent  Commencement  Date." The term of this Lease shall
end on the day (the "Termination Date") immediately preceding the date seventeen
(17)  years  after the Rent  Commencement  Date,  unless  sooner  terminated  or
extended as hereinafter provided.

                  (b) Notwithstanding any other provisions of this Lease, Tenant
shall have the right to terminate this Lease by written  notice to Landlord,  at
any time during the period from July 1, 1997 through July 9, 1997, inclusive, if
the [...*...] has not, by June 30, 1997,  confirmed in a writing satisfactory to
Tenant in form and substance (in Tenant's reasonable  judgment) the [...*...] of
Landlord's  proposed  acquisition of the Adjacent  Property,  including (but not
limited to) the [...*...]  with respect to some or all of the Adjacent  Property
to the extent necessary to facilitate such acquisition.

         2.2 Early  Possession.  Tenant  shall  have the  nonexclusive  right to
occupy and take  possession  of the Initial  Building from and after the date of
Landlord's delivery of the Structural Completion Certificate described in clause
(i) of Section 2.1,  even though  Landlord  will be  continuing to construct the
balance of  Landlord's  Work as  contemplated  in Exhibit C, for the  purpose of
constructing  Tenant's Work as  contemplated in Exhibit C and for the purpose of
installing  fixtures and furniture,  laboratory  equipment,  computer equipment,
telephone  equipment,  low voltage data wiring and  personal  property and other
similar work related to the construction of Tenant's Work and/or  preparatory to
the  commencement  of Tenant's  business on the  Property.  Such  occupancy  and
possession,  and any early access  under the next  sentence of this Section 2.2,
shall be subject to and upon all of the terms and  conditions  of this Lease and
of the Workletter  attached hereto as Exhibit C (including,  but not limited to,
conditions  relating  to the  maintenance  of required  insurance),  except that
Tenant shall have no obligation to pay minimum rental or Operating  Expenses for
any period prior to the Rent  Commencement Date as determined under Section 2.1;
such  early   possession   shall  not  advance  or  otherwise  affect  the  Rent
Commencement Date or Termination Date determined under Section 2.1. Tenant shall
also be entitled to have early access to the Property at all  appropriate  times
prior to Landlord's delivery of the Structural Completion  Certificate,  subject
to the approval of Landlord and its


- ---------------------------
*CONFIDENTIAL TREATMENT REQUESTED
                                        3

<PAGE>



general  contractor  (which  approval  shall  not be  unreasonably  withheld  or
delayed) and to all other provisions of this Section 2.2, solely for the purpose
of performing work preparatory to the construction of Tenant's Work or necessary
for the orderly sequencing of such work, and Tenant shall not be required to pay
minimum  rental or  Operating  Expenses by reason of such early access until the
Rent Commencement Date otherwise occurs;  without limiting the generality of the
preceding  portion of this  sentence,  Tenant  shall be  entitled  to have early
access  to the  Property  and the  Initial  Building  as soon as the roof  metal
decking  is in  place to  begin  hanging  electrical,  mechanical  and  plumbing
services from the overhead  structure,  subject to all of the provisions of this
Section 2.2. Tenant shall not interfere with or delay Landlord's  contractors by
any early  access,  occupancy  or  possession  under  this  Section  2.2,  shall
coordinate and cooperate with Landlord and its contractors  (who shall similarly
coordinate  and  cooperate  with Tenant and its  contractors)  to  minimize  any
interference or delay by either party with respect to the other's work following
Landlord's  delivery  of  the  Structural  Completion  Certificate,   and  shall
indemnify,  defend and hold harmless  Landlord and its agents and employees from
and  against  any and all  claims,  demands,  liabilities,  actions,  costs  and
expenses, including (but not limited to) reasonable attorneys' fees, arising out
of or in connection with Tenant's early entry upon the Property hereunder.

         2.3 Delay In  Possession.  Landlord  agrees to use its best  reasonable
efforts to complete  the work  described  in Section 5.1 and Exhibit C promptly,
diligently  and within the  respective  time periods set forth in the  estimated
construction  schedule  attached hereto as Exhibit D and incorporated  herein by
this  reference,  as such  schedule may be modified  from time to time by mutual
agreement  of  Landlord  and  Tenant,  and  subject to the effects of any delays
caused by or attributable to Tenant or any other circumstances beyond Landlord's
reasonable control (excluding any financial inability);  provided, however, that
except to the extent caused by a material default by Landlord of its obligations
set forth in this Lease  (including,  but not  limited to, its  obligations  set
forth in this Section 2.3 and in Section 5.1 and Exhibit C),  Landlord shall not
be liable for any damages  caused by any delay in the  completion  of such work,
nor shall any such delay affect the validity of this Lease or the obligations of
Tenant  hereunder.  Notwithstanding  any other  provisions  of this Section 2.3,
however, if Landlord fails to deliver the Structural Completion  Certificate and
tender  possession of the completed  structural  portions of the Building  Shell
(i.e., those portions required to be completed as a condition of delivery of the
Structural  Completion  Certificate)  to Tenant by the date  which is  [...*...]
after the date of this Lease, then Tenant shall have the right to terminate this
Lease  without  further  liability  hereunder  by written  notice  delivered  to
Landlord at any time prior to Landlord's  delivery of the Structural  Completion
Certificate and tender of possession of the completed structural portions of the
Building Shell to Tenant; provided, however, that the [...*...] period set forth
in this  sentence  shall be  extended,  day for day,  for a period  equal to the
length of any delays in Landlord's design and construction of the Building Shell
that are  caused by any  material  default by Tenant in the  performance  of its
obligations  under this  Lease,  including  (but not  limited to) any failure of
Tenant to make  prompt  and  timely  delivery  to  Landlord  of all  information
reasonably necessary for Landlord to complete the preparation of all drawings,


- ---------------------------
*CONFIDENTIAL TREATMENT REQUESTED
                                        4

<PAGE>


designs and  specifications  for the Building Shell and/or any failure of Tenant
to respond in a prompt and timely  manner to any  requests  by  Landlord  or its
architect for approval of drawings,  designs,  specifications,  changes or other
matters requiring Tenant's review or approval under the provisions of Exhibit C.

         2.4  Acknowledgement Of Rent Commencement.  Promptly following the Rent
Commencement Date,  Landlord and Tenant shall execute a written  acknowledgement
of  the  Rent   Commencement   Date,   Termination  Date  and  related  matters,
substantially  in the  form  attached  hereto  as  Exhibit  E (with  appropriate
insertions),  which acknowledgement shall be deemed to be incorporated herein by
this reference. Notwithstanding the foregoing requirement, the failure of either
party  to  execute  such  a  written   acknowledgement   shall  not  affect  the
determination  of the Rent  Commencement  Date,  Termination  Date  and  related
matters in accordance with the provisions of this Lease.

         2.5 Holding  Over.  If Tenant holds  possession  of the Property or any
portion  thereof after the term of this Lease with Landlord's  written  consent,
then except as otherwise specified in such consent, Tenant shall become a tenant
from month to month at  [...*...]  of the rental  and  otherwise  upon the terms
herein specified for the period immediately prior to such holding over and shall
continue in such status until the tenancy is terminated by either party upon not
less than thirty (30) days prior written notice.  If Tenant holds  possession of
the  Property  or any  portion  thereof  after  the term of this  Lease  without
Landlord's  written consent,  then Landlord in its sole discretion may elect (by
written  notice to Tenant) to have Tenant  become a tenant  either from month to
month or at will,  at [...*...] of the rental  (prorated on a daily basis for an
at-will  tenancy,  if applicable) and otherwise upon the terms herein  specified
for the period  immediately  prior to such holding  over, or may elect to pursue
any and all legal  remedies  available  to Landlord  under  applicable  law with
respect to such unconsented  holding over by Tenant.  Tenant shall indemnify and
hold Landlord harmless from any loss, damage, claim, liability,  cost or expense
(including  reasonable  attorneys'  fees)  resulting from any delay by Tenant in
surrendering  the Property  (except to the extent such delay is with  Landlord's
prior  written  consent),  including  but not  limited to any  claims  made by a
succeeding  tenant by  reason  of such  delay.  Acceptance  of rent by  Landlord
following expiration or termination of this Lease shall not constitute a renewal
of this Lease.

         2.6 Option To Extend  Term.  Tenant shall have the option to extend the
term of this Lease,  at the minimum  rental set forth in Section  3.1(e) and (f)
and otherwise upon all the terms and provisions set forth herein with respect to
the initial term of this Lease, for up to two (2) additional periods of five (5)
years each,  commencing upon expiration of the initial term hereof.  Exercise of
such option  with  respect to the first such  extended  term shall be by written
notice to Landlord at least  twelve (12) months prior to the  expiration  of the
initial term hereof; exercise of such option with respect to the second extended
term, if the first extension  option has been duly  exercised,  shall be by like
written  notice to Landlord at least twelve (12) months prior to the  expiration
of the first extended term hereof. If Tenant is in default hereunder, beyond any


- ---------------------------
*CONFIDENTIAL TREATMENT REQUESTED
                                        5

<PAGE>


applicable  notice and cure  periods,  on the date of such notice or on the date
any extended term is to commence, then the exercise of the option shall be of no
force or effect,  the  extended  term shall not  commence  and this Lease  shall
expire at the end of the then  current  term hereof (or at such  earlier time as
Landlord may elect pursuant to the default  provisions of this Lease). If Tenant
properly  exercises one or more extension  options under this Section,  then all
references  in this Lease (other than in this Section 2.6) to the "term" of this
Lease  shall be  construed  to include the  extension  term(s)  thus  elected by
Tenant.  Except as  expressly  set forth in this Section 2.6 and in Section 2.7,
Tenant  shall  have no  right  to  extend  the  term of this  Lease  beyond  its
prescribed term.

         2.7 Extension of Initial Term. In the event Tenant exercises any of its
expansion  options under Article 6 hereof,  the initial term and the Termination
Date shall be extended in accordance with Section 6.3(c), below.


                                    3. RENTAL

         3.1      Minimum Rental.

                  (a) Rental  Amounts.  Tenant  shall pay to Landlord as minimum
rental for the Initial Building, in advance,  without deduction,  offset, notice
or demand,  on or before the Rent  Commencement  Date and on or before the first
day of each subsequent  calendar month of the term of this Lease,  the following
amounts per month,  subject to adjustment  in accordance  with the terms of this
Section 3.1:

                     [rest of page intentionally left blank]


                                        6

<PAGE>



         Months                    Monthly Minimum Rental
        ---------           ----------------------------------------------

        001 - 012           $ [...*...]       ($[...*...] per square foot)
        013 - 024             [...*...]       ($[...*...] per square foot)
        025 - 036             [...*...]       ($[...*...] per square foot)
        037 - 048             [...*...]       ($[...*...] per square foot)
        049 - 060             [...*...]       ($[...*...] per square foot)
        061 - 072             [...*...]       ($[...*...] per square foot)
        073 - 084             [...*...]       ($[...*...] per square foot)
        085 - 096             [...*...]       ($[...*...] per square foot)
        097 - 108             [...*...]       ($[...*...] per square foot)
        109 - 120             [...*...]       ($[...*...] per square foot)
        121 - 132             [...*...]       ($[...*...] per square foot)
        133 - 144             [...*...]       ($[...*...] per square foot)
        145 - 156             [...*...]       ($[...*...] per square foot)
        157 - 168             [...*...]       ($[...*...] per square foot)
        169 - 180             [...*...]       ($[...*...] per square foot)
        181 - 192             [...*...]       ($[...*...] per square foot)
        193 - 204             [...*...]       ($[...*...] per square foot)

If the  obligation to pay minimum rental  hereunder  commences on other than the
first day of a calendar  month or if the term of this Lease  terminates on other
than the last day of a calendar month, the minimum rental for such first or last
month of the term of this Lease,  as the case may be, shall be prorated based on
the number of days the term of this Lease is in effect during such month.  If an
increase in minimum rental  becomes  effective on a day other than the first day
of a calendar  month,  the minimum rental for that month shall be the sum of the
two  applicable  rates,  each prorated for the portion of the month during which
such rate is in effect.

                  (b) Rental  Adjustment  Due to Change in Square  Footage.  The
minimum rental amounts specified in this Section 3.1 are based upon an estimated
area of [...*...]  square feet for the Initial  Building.  If the actual area of
the Initial  Building  (measured  from the  exterior  faces of  exterior  walls,
excluding overhangs, which are not expected to be substantial),  when completed,
is greater or less than such estimated area, then the minimum rentals  specified
in Section 3.1(a) shall be adjusted for each rental period in strict  proportion
to the  ratio  between  the  actual  area of the  Initial  Building  during  the
applicable  period  (determined on the basis of measurement  described  above in
this sentence) and the assumed area of [...*...]  square feet.  Measurements  of
building  area  under  this  paragraph  shall be made  initially  by  Landlord's
architect, subject to review and approval by Tenant's architect.

                  (c) Rental Adjustment in Connection with Cost of Improvements.
The minimum rental  amounts  specified in Section 3.1(a) are based on an assumed
amount of [...*...] per square foot for the Cost of Improvements  (determined in
accordance with Exhibit C) of the


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Tenant  Improvements  to be  constructed  by Tenant  pursuant to Section 5.1 and
Exhibit C (and are thus based on an assumed  amount of [...*...] per square foot
for Landlord's share of such Cost of Improvements). Under no circumstances shall
Landlord's  liability  for such Cost of  Improvements  exceed  the lesser of (i)
[...*...] of the total Cost of Improvements for such Tenant Improvements or (ii)
[...*...]  per square foot  multiplied  by the area of the  Initial  Building as
determined in accordance  with Section  3.1(b)  hereof.  If, upon  completion of
construction of the Tenant Improvements,  it is determined that Landlord's share
of  the  Cost  of  Improvements  of  such  Tenant  Improvements  (determined  in
accordance  with  Exhibit C) is less than  [...*...]  per square foot (using the
area of the Premises as determined in accordance  with Section  3.1(b)  hereof),
then the minimum rental amounts specified in Section 3.1(a) shall be adjusted as
follows:

                           (i) If Landlord's  share of such Cost of Improvements
         is less than  [...*...]  per square foot but is at least  [...*...] per
         square foot, then the minimum rental under Section 3.1(a) during months
         1 through 84 of the term of this Lease shall be  decreased by [...*...]
         per square foot per month for each  [...*...]  per square foot by which
         Landlord's  share of such Cost of  Improvements  is less than [...*...]
         per  square  foot   (prorated   for  any  portion  of  such   shortfall
         representing a fraction of [...*...] per square foot);

                           (ii) If Landlord's share of such Cost of Improvements
         is less than  [...*...]  per square foot but is at least  [...*...] per
         square foot, then the minimum rental under Section 3.1(a) during months
         1 through 84 of the term of this Lease shall be decreased by the sum of
         (A)  [...*...]  per square foot per month plus (B) [...*...] per square
         foot per month for each  [...*...] per square foot by which  Landlord's
         share of such Cost of  Improvements  is less than  [...*...] per square
         foot,  and the minimum  rental under  Section  3.1(a)  during months 85
         through 120 of the term of this Lease shall be  decreased  by [...*...]
         per square foot per month for each  [...*...]  per square foot by which
         Landlord's  share of such Cost of  Improvements  is less than [...*...]
         per  square  foot  (prorated,  in each  case,  for any  portion of such
         shortfall representing a fraction of [...*...] per square foot); and

                           (iii)   If   Landlord's   share   of  such   Cost  of
         Improvements  is less than  [...*...]  per square foot but is more than
         [...*...] per square foot, then the minimum rental under Section 3.1(a)
         during months 1 through 84 of the term of this Lease shall be decreased
         by the  sum of (A)  [...*...]  per  square  foot  per  month  plus  (B)
         [...*...] per square foot per month for each  [...*...] per square foot
         by which  Landlord's  share of such Cost of  Improvements  is less than
         [...*...] per square foot,  the minimum rental during months 85 through
         120 shall be decreased by the sum of (C)  [...*...] per square foot per
         month plus (D) [...*...]  per square foot per month for each  [...*...]
         per square foot by which  Landlord's share of such Cost of Improvements
         is less than  [...*...] per square foot,  and the minimum rental during
         months 121 through 168 shall be decreased


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                                        8

<PAGE>


         by [...*...]  per square foot per month for each  [...*...]  per square
         foot by which  Landlord's  share of such Cost of  Improvements  is less
         than [...*...] per square foot (prorated, in each case, for any portion
         of such  shortfall  representing  a fraction  of  [...*...]  per square
         foot).

                  (d) Rental Adjustment Due to Deferral of Tenant  Improvements.
If Tenant elects to defer  completion of any portion of the Tenant  Improvements
as  contemplated  in  Section  5.1(b)  and  Exhibit  C and,  as a result of such
deferral,   Landlord's   share  of  the  Cost  of  Improvements  of  the  Tenant
Improvements  completed  on or about  the Rent  Commencement  Date is less  than
[...*...] per square foot, then Tenant's minimum rental obligation under Section
3.1(a)  shall be  reduced,  to  reflect  such  shortfall  in  Landlord's  actual
contribution in accordance with the formula set forth in Section 3.1(c), for the
period  from  the Rent  Commencement  Date  until  the  earlier  to occur of (i)
substantial  completion of the deferred  portion of the Tenant  Improvements  or
(ii)  eighteen  (18) months  after the Rent  Commencement  Date.  Any  continued
reduction  in  minimum  rental  after  the end of the  period  described  in the
preceding  sentence shall be made only if  construction  of the deferred  Tenant
Improvements is  substantially  completed  within eighteen (18) months after the
Rent   Commencement   Date  and  Landlord's  share  of  the  aggregate  Cost  of
Improvements  of the Tenant  Improvements  (taking into account both the initial
Tenant Improvements and the deferred Tenant Improvements) is less than [...*...]
per square foot, in which event a continuing  reduction in minimum  rental shall
be  implemented  in  accordance  with the  formula  set forth in Section  3.1(c)
hereof.

                  (e) Rental  Amounts  During  First  Extended  Term.  If Tenant
properly  exercises  its  right to extend  the term of this  Lease  pursuant  to
Section 2.6 hereof,  the minimum  rental during the first extended term shall be
equal to [...*...] of the fair market  rental value of the Initial  Building (as
defined below),  including any rental increase  provisions then customary in the
City of South  San  Francisco  for  comparable  commercial  leases  for  office,
laboratory  and  research  and  development  projects,   determined  as  of  the
commencement  of such  extended  term in accordance  with this  paragraph.  Upon
Landlord's  receipt of a proper  notice of  Tenant's  exercise  of its option to
extend the term of this Lease,  the parties  shall have sixty (60) days in which
to agree on the fair market rental  (including  any applicable  rental  increase
provisions) for the Initial  Building at the  commencement of the first extended
term for the uses permitted hereunder.  If the parties agree on such fair market
rental and rental increase  provisions (if any), they shall execute an amendment
to this Lease stating the amount of the  applicable  minimum  monthly rental and
any applicable rental increase provisions. If the parties are unable to agree on
such rental  (including any applicable rental increase  provisions)  within such
sixty (60) day period,  then within  fifteen (15) days after the  expiration  of
such  period each party,  at its cost and by giving  notice to the other  party,
shall appoint a real estate  appraiser  with at least five (5) years  experience
appraising  similar  commercial  properties in northeastern  San Mateo County to
appraise  and set the fair  market  rental and any  applicable  rental  increase
provisions for the Initial  Building at the  commencement  of the first extended
term in accordance with the provisions of this Section  3.1(e).  If either party
fails to appoint an appraiser within the allotted time, the


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                                        9

<PAGE>


single appraiser appointed by the other party shall be the sole appraiser. If an
appraiser  is appointed by each party and the two  appraisers  so appointed  are
unable to agree upon a fair market rental (and any  appropriate  rental increase
provisions) within thirty (30) days after the appointment of the second, the two
appraisers shall appoint a third similarly  qualified  appraiser within ten (10)
days after the  expiration  of such 30-day  period;  if they are unable to agree
upon a third appraiser,  then either party may, upon not less than five (5) days
notice to the other party,  apply to the Presiding Judge of the San Mateo County
Superior Court for the  appointment of a third qualified  appraiser.  Each party
shall  bear its own  legal  fees in  connection  with  appointment  of the third
appraiser and shall bear one-half of any other costs of appointment of the third
appraiser  and of such  third  appraiser's  fee.  The third  appraiser,  however
selected, shall be a person who has not previously acted for either party in any
capacity.  Within thirty (30) days after the appointment of the third appraiser,
a majority  of the three  appraisers  shall set the fair  market  rental and any
applicable  rental increase  provisions for the first extended term and shall so
notify the parties.  If a majority are unable to agree within the allotted time,
(i) the three  appraised fair market rentals shall be added together and divided
by three and the  resulting  quotient  shall be the fair  market  rental for the
first extended term, and (ii) the applicable rental increase  provision shall be
equal to the  mathematical  average  (or the  nearest  reasonable  approximation
thereof) of the two rental increase  provisions that are most nearly comparable,
which determinations shall be binding on the parties and shall be enforceable in
any further  proceedings  relating to this Lease.  For  purposes of this Section
3.1(e),  the "fair market  rental" of the Initial  Building  shall be determined
with reference to the then prevailing  market rental rates for properties in the
City of South San  Francisco  with shell,  office,  laboratory  and research and
development improvements and site (common area) improvements comparable to those
then existing in the Initial  Building and on the Property,  including  (without
limitation) the Improvements constructed by Landlord pursuant to Section 5.1 and
Exhibit C, the Tenant Improvements constructed by Tenant pursuant to Section 5.1
and  Exhibit C and any and all other  alterations,  additions  and  improvements
(including,  but not limited to,  equipment  and  laboratory  improvements,  but
excluding  any  equipment  installed by Tenant after  substantial  completion of
Tenant's initial  build-out of the Tenant  Improvements  pursuant to Section 5.1
and Exhibit C) constructed  by or for Tenant,  whether at Landlord's or Tenant's
expense and whether paid for in cash or through  additional  rent or financed in
any other manner.

                  (f) Rental  Amounts  During  Second  Extended  Term. If Tenant
properly exercises its right to a second extended term of this Lease pursuant to
Section 2.6 hereof, the minimum rental during such second extended term shall be
determined in the same manner provided in the preceding  paragraph for the first
extended  term,  except  that  the  determination   shall  be  made  as  of  the
commencement of the second extended term.

         3.2 Late  Charge.  If  Tenant  fails to pay  when due  rental  or other
amounts due Landlord hereunder,  such unpaid amounts shall bear interest for the
benefit of Landlord at a rate equal to the lesser of [...*...]  per annum or the
[...*...],  from  the  date  due to the date of  payment.  In  addition  to such
interest, Tenant shall pay to Landlord a late charge in an amount


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                                       10

<PAGE>


equal to [...*...] of any  installment  of minimum  rental and any other amounts
due  Landlord  if not paid in full on or before  the fifth  (5th) day after such
rental or other amount is due. Tenant  acknowledges  that late payment by Tenant
to Landlord  of rental or other  amounts due  hereunder  will cause  Landlord to
incur costs not  contemplated  by this  Lease,  including,  without  limitation,
processing  and  accounting  charges  and late  charges  which may be imposed on
Landlord  by the terms of any loan  relating  to the  Property.  Tenant  further
acknowledges  that it is extremely  difficult and  impractical  to fix the exact
amount of such  costs and that the late  charge  set forth in this  Section  3.2
represents a fair and reasonable estimate thereof. Acceptance of any late charge
by Landlord  shall not  constitute a waiver of Tenant's  default with respect to
overdue rental or other amounts, nor shall such acceptance prevent Landlord from
exercising any other rights and remedies  available to it. Acceptance of rent or
other  payments by Landlord  shall not  constitute  a waiver of late  charges or
interest  accrued  with  respect  to such  rent or other  payments  or any prior
installments  thereof, nor of any other defaults by Tenant,  whether monetary or
non-monetary in nature, remaining uncured at the time of such acceptance of rent
or other payments.


                                4. STOCK WARRANTS

         4.1      Stock Warrants.

                  (a) Within  thirty (30) days after the execution of this Lease
and as a condition to Landlord's obligations hereunder,  Tenant shall deliver to
Landlord or Landlord's  assignees  (which may be any partners,  shareholders  or
affiliates of Landlord or any affiliates of any such partners,  shareholders  or
affiliates  of  Landlord)  warrants  registered  in  the  name  of  Landlord  or
Landlord's  assignees for the acquisition of an aggregate of [...*...] shares of
Tenant's  common stock,  which warrants shall be in form and substance  mutually
satisfactory  to Landlord and Tenant.  The warrants shall have an exercise price
per share equal to [...*...] of the average  closing  price for Tenant's  common
stock on the NASDAQ  National  Market  System for the twenty (20)  trading  days
immediately  preceding  the  date  of  execution  of this  Lease  and  shall  be
exercisable for a period of [...*...] years from the date of issuance.

                  (b) If Tenant  elects  to  exercise  the  Phase IIA  Expansion
Option  under  Section  6.3(a)  hereof,  then within  thirty (30) days after the
execution  of a lease  or lease  amendment  covering  the  Phase  IIA  Expansion
Premises and as a condition to Landlord's obligations  thereunder,  Tenant shall
deliver  to  Landlord  or  Landlord's  assignees  (which  may be  any  partners,
shareholders  or affiliates of Landlord or any  affiliates of any such partners,
shareholders  or  affiliates  of Landlord)  warrants  registered  in the name of
Landlord or Landlord's  assignees for the  acquisition  of a number of shares of
Tenant's  common  stock  equal to  [...*...]  of the number of square feet to be
included in the Phase IIA Expansion Premises,  subject to adjustment if, between
the date of this Lease and the date of  issuance  of a warrant  pursuant to this
Section, the common stock of Tenant is changed into a different number or class


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                                       11

<PAGE>


of  shares  by reason  of any  stock  dividend,  subdivision,  reclassification,
recapitalization,  split-up,  combination or similar transaction, which warrants
shall be in form and substance  substantially identical to those issued pursuant
to Section 4.1(a).  The warrants shall have an exercise price per share equal to
[...*...] of the average  closing price for Tenant's  common stock on the NASDAQ
National Market System,  or on such other exchange or trading system as Tenant's
common stock,  or other  security into which such common stock may be changed by
reason  of any  reclassification,  recapitalization,  split-up,  combination  or
similar  transaction,  may then be listed or traded, for the twenty (20) trading
days immediately preceding the date of execution of the lease or lease amendment
for the Phase IIA Expansion  Premises and shall be  exercisable  for a period of
[...*...] years from the date of issuance.

                  (c) If Tenant  elects  to  exercise  the  Phase IIB  Expansion
Option  under  Section  6.3(b)  hereof,  then within  thirty (30) days after the
execution  of a lease  or lease  amendment  covering  the  Phase  IIB  Expansion
Premises and as a condition to Landlord's obligations  thereunder,  Tenant shall
deliver  to  Landlord  or  Landlord's  assignees  (which  may be  any  partners,
shareholders  or affiliates of Landlord or any  affiliates of any such partners,
shareholders  or  affiliates  of Landlord)  warrants  registered  in the name of
Landlord or Landlord's  assignees for the  acquisition  of a number of shares of
Tenant's  common  stock  equal to  [...*...]  of the number of square feet to be
included in the Phase IIB Expansion Premises,  subject to adjustment if, between
the date of this Lease and the date of  issuance  of a warrant  pursuant to this
Section,  the common stock of Tenant is changed into a different number or class
of  shares  by reason  of any  stock  dividend,  subdivision,  reclassification,
recapitalization,  split-up,  combination or similar transaction, which warrants
shall be in form and substance  substantially identical to those issued pursuant
to Section 4.1(a).  The warrants shall have an exercise price per share equal to
[...*...] of the average  closing price for Tenant's  common stock on the NASDAQ
National Market System,  or on such other exchange or trading system as Tenant's
common stock,  or other  security into which such common stock may be changed by
reason  of any  reclassification,  recapitalization,  split-up,  combination  or
similar  transaction,  may then be listed or traded, for the twenty (20) trading
days immediately preceding the date of execution of the lease or lease amendment
for the Phase IIB Expansion  Premises and shall be  exercisable  for a period of
[...*...] years from the date of issuance.

                  (d)  Notwithstanding any other provisions of this Section 4.1,
Tenant  shall not be  committed  or  obligated,  under  the terms of  paragraphs
4.1(a), (b) and (c) in the aggregate,  to issue warrants for more than [...*...]
shares of Tenant's  common stock,  subject to adjustment if, between the date of
this Lease and the date of issuance of warrants pursuant to Section 4.1(a),  (b)
and/or  (c),  as  applicable,  the  common  stock of  Tenant is  changed  into a
different   number  or  class  of  shares  by  reason  of  any  stock  dividend,
subdivision,  reclassification,   recapitalization,   split-up,  combination  or
similar  transaction.  Since the maximum of  [...*...]  shares has been set with
reference to an anticipated  total square  footage of [...*...]  square feet for
the  Initial  Premises,  the  Phase  IIA  Expansion  Premises  and the Phase IIB
Expansion  Premises,  however,  nothing in Article 6 or  elsewhere in this Lease
shall be construed to require Landlord to make


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available  to  Tenant  more  than  [...*...]  square  feet  of  premises  in the
aggregate,  and to the extent  Tenant  requests  at any time the right to occupy
premises containing, in the aggregate, more than [...*...] square feet, Landlord
shall be entitled to condition its agreement to lease such larger premises upon,
among  other  things,  agreement  between  Landlord  and  Tenant  on a  mutually
satisfactory  number of warrants  (if any) to be issued in  connection  with the
expanded premises.


                                 5. CONSTRUCTION

         5.1      Construction of Improvements.

                  (a) Landlord  shall, at Landlord's cost and expense (except as
otherwise  provided  herein  and in Exhibit  C),  construct  Landlord's  Work as
defined in and in accordance  with the terms and  conditions  of the  Workletter
attached  hereto as Exhibit C (the  "Workletter").  Landlord  shall use its best
reasonable efforts to complete such construction promptly, diligently and within
the applicable time periods set forth in the construction  schedule developed or
to be developed pursuant to Exhibit D and incorporated herein by this reference,
as such  schedule  may be  modified  from  time to time in  accordance  with the
Workletter,  subject to the effects of any delays  caused by Tenant or any other
circumstances  beyond  Landlord's  reasonable  control  (excluding any financial
inability), and subject to the provisions of Section 2.3 above.

                  (b) Tenant  shall,  at Tenant's  cost and  expense  (except as
otherwise  provided herein and in Exhibit C), promptly and diligently  construct
Tenant's Work as defined in and in accordance  with the terms and  conditions of
the Workletter.  Notwithstanding the preceding  sentence,  Tenant shall have the
right,  as set  forth in the  Workletter,  to  defer  completion  of the  Tenant
Improvements  in up to [...*...]  square feet of the Initial  Building for up to
eighteen  (18) months  after the Rent  Commencement  Date.  Landlord  and Tenant
acknowledge,  however,  that even within the area as to which such completion of
Tenant Improvements is to be deferred,  it is likely to be necessary to complete
a portion of the Tenant  Improvements in that area (such as, but not limited to,
plumbing  and  HVAC) in order  for the City of South  San  Francisco  to issue a
certificate  of occupancy  (or  reasonable  equivalent  thereof) for the Initial
Building at or about the Rent  Commencement  Date,  and that  Tenant's  right to
defer completion of Tenant Improvements will not extend to any such work that is
necessary  in order  to  obtain  a  certificate  of  occupancy  for the  Initial
Building.

         5.2 Condition of Property.  Landlord  shall deliver the Building  Shell
and other  Improvements  constructed  by  Landlord  to Tenant  clean and free of
debris,  promptly upon completion of construction thereof, and Landlord warrants
to Tenant that the Building Shell and other Improvements constructed by Landlord
(i)  shall  be free  from  material  structural  defects  and  shall  be in good
operating condition on the Rent Commencement Date, and (ii) shall be constructed
in  compliance  in all  material  respects  with the  plans  and  specifications
developed  pursuant  to the  Workletter  and  mutually  approved  (to the extent
required thereunder) by


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Landlord  and  Tenant,  subject  to any  changes  implemented  in such plans and
specifications in accordance with the procedures set forth in the Workletter. If
it is determined  that this  warranty has been violated in any respect,  then it
shall be the obligation of Landlord, after receipt of written notice from Tenant
setting forth with  specificity  the nature of the  violation,  to promptly,  at
Landlord's  sole cost,  correct the  condition(s)  constituting  such violation.
Tenant's  failure to give such  written  notice to Landlord  within one (1) year
after the Rent  Commencement  Date shall give rise to a  conclusive  presumption
that Landlord has complied with all  Landlord's  obligations  hereunder,  except
with respect to latent defects (as to which such one-year  limitation  shall not
apply). Without limiting the scope of Landlord's obligations under the foregoing
provisions of this Section 5.2,  Landlord also agrees to either (x) use its best
reasonable  efforts to enforce when and as necessary,  for the benefit of Tenant
and the Improvements,  any and all contractor's and/or manufacturer's warranties
extending more than one (1) year after the Rent  Commencement  Date with respect
to any of Landlord's Work or, at Tenant's request, (y) assign any or all of such
warranties to Tenant for  enforcement  purposes.  TENANT  ACKNOWLEDGES  THAT THE
FOREGOING WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES,  EXPRESS OR IMPLIED, WITH
RESPECT TO THE  PHYSICAL  CONDITION OF THE  IMPROVEMENTS  TO BE  CONSTRUCTED  BY
LANDLORD AND THAT  LANDLORD  MAKES NO OTHER  WARRANTIES  EXCEPT AS EXPRESSLY SET
FORTH IN THIS LEASE.

         5.3 Compliance with Law.  Landlord warrants to Tenant that the Building
Shell and other Improvements constructed by Landlord (when constructed), as they
exist on the Rent  Commencement  Date,  but without  regard to the use for which
Tenant will occupy the Property, shall not violate any covenants or restrictions
of record or any  applicable  law,  building  code,  regulation  or ordinance in
effect on the Rent  Commencement  Date.  Tenant  warrants to  Landlord  that the
Tenant  Improvements and any other improvements  constructed by Tenant from time
to time shall not violate any  applicable  law,  building  code,  regulation  or
ordinance  in  effect  on  the  Rent  Commencement  Date  or at  the  time  such
improvements  are  placed  in  service.  If it is  determined  that any of these
warranties has been violated,  then it shall be the obligation of the warranting
party,  after written notice from the other party,  to correct the  condition(s)
constituting such violation  promptly,  at the warranting  party's sole cost and
expense.  Tenant  acknowledges that except as expressly set forth in this Lease,
neither  Landlord  nor any  agent of  Landlord  has made any  representation  or
warranty as to the present or future suitability of the Property or Improvements
for the conduct of Tenant's business or proposed business thereon.


                                       14

<PAGE>



                              6. EXPANSION OPTIONS

         6.1 Adjacent Property Lock-Up. The parties acknowledge that at Tenant's
request  and  in  order  to  make  available  to  Tenant  the  expansion  rights
contemplated  in this Article 6, Landlord  agrees to attempt to acquire the real
property  designated  as  "Adjacent  Property"  on the Site Plan (the  "Adjacent
Property"),  and that such  acquisition  may [...*...] or other  assistance from
[...*...] (as contemplated in Section 2.1(b) hereof).  If Landlord  acquires the
Adjacent  Property  at any time  during the  period  from the date of this Lease
until  [...*...]  after the Rent  Commencement  Date, then (i) Tenant shall have
certain  expansion  options  with  respect  to the  Adjacent  Property,  as more
particularly set forth in Section 6.3 hereof,  and (ii) until all such expansion
options  under  Section  6.3 hereof  have  lapsed,  terminated,  expired or been
exercised (the "Lock-Up  Period"),  Landlord shall refrain from entering into an
agreement with any person or entity other than Tenant for the sale or leasing of
the  Adjacent  Property  or of  any  buildings  constructed  thereon  (provided,
however,  that  nothing in this  Article 6 shall  restrict  Landlord's  right to
construct  and lease to one or more third parties a building or buildings in the
southerly portion of the Adjacent  Property,  as shown on the Site Plan, so long
as Landlord  retains the  ability,  under  existing  land use  restrictions  and
requirements, to build at least [...*...] square feet of space for Tenant in the
northerly portion of the Adjacent  Property as shown on the Site Plan).  Failure
of Tenant to  exercise  its  expansion  option(s)  on or before  the  applicable
deadline  under  Section  6.3 shall  result in the lapse or  expiration  of such
expansion  option(s) and the  termination  of all further rights of Tenant under
this Article 6.

         6.2 Lock-Up Consideration.  As consideration for Landlord's willingness
to agree to the  restrictions  set forth in clause  (ii) of Section  6.1 for the
duration  of the  Lock-Up  Period,  Tenant  shall pay or  reimburse  to Landlord
[...*...] of all  reasonable  carrying  costs incurred by Landlord in connection
with  the  Adjacent  Property  during  or with  respect  to the  Lock-Up  Period
(collectively,  "Carrying  Costs"),  including (but not limited to) (i) interest
expense at the Bank of America  prime rate on Landlord's  acquisition  costs for
the Adjacent  Property,  (ii) interest expense at the Bank of America prime rate
on  Landlord's  costs  incurred  prior to or during the  Lock-Up  Period for any
construction of utilities,  Common Area  improvements  and other  infrastructure
improvements  (but  not  for  construction  of any  buildings)  on the  Adjacent
Property,  and (iii)  real  property  taxes,  assessments  and  insurance  on or
allocable to the Adjacent Property;  provided, however, that Landlord's Carrying
Costs shall be reduced or offset by the amount of net income, if any, derived by
Landlord from the Adjacent Property during the applicable portion of the Lock-Up
Period from any leasing of any  portion of the  Adjacent  Property to any tenant
other than Tenant.  Tenant shall pay Landlord's  estimated Carrying Costs during
the Lock-Up Period in advance,  on a quarterly basis, as follows:  When Landlord
acquires the Adjacent Property, Landlord shall give Tenant prompt written notice
of such  acquisition  and shall  accompany such notice with  Landlord's  written
estimate,  in reasonable  detail, of the Carrying Costs for the period ending at
the end of the then current  calendar  quarter.  Within  fifteen (15) days after
receipt of such notice, Tenant shall pay the amount of such estimated


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                                       15

<PAGE>


Carrying  Costs to  Landlord.  Thereafter,  on or about  the  first  day of each
calendar quarter during the Lock-Up Period, Landlord shall give Tenant a further
written estimate,  in reasonable detail, of the Carrying Costs for such upcoming
calendar  quarter  and Tenant  shall pay the amount of such  estimated  Carrying
Costs to Landlord within fifteen (15) days after receipt of such notice.  Within
fifteen  (15) days after the end of each  calendar  quarter  during the  Lock-Up
Period,  Landlord shall notify Tenant in writing of Landlord's  actual  Carrying
Costs for such  calendar  quarter,  and within  ten (10) days after such  notice
either (i) Tenant shall pay  Landlord  the amount by which such actual  Carrying
Costs  exceeded the  estimated  Carrying  Costs paid by Tenant for such calendar
quarter or (ii)  Landlord  shall pay  Tenant  the amount by which the  estimated
Carrying  Costs  paid by Tenant  exceeded  the  actual  Carrying  Costs for such
calendar  quarter.  If taxes or other Carrying  Costs  allocable to any calendar
quarter  are  increased  or  decreased  (for  example,  by a  tax  reduction  or
additional tax assessment)  following  completion of the reconciliation  process
described in the preceding  sentence,  Landlord shall promptly  notify Tenant in
writing of such  further  increase  or decrease  and the parties  shall make any
further  adjustment  payments  in cash in the same  manner  contemplated  in the
preceding  sentence.  Failure of Tenant to make any payment  when due under this
Section 6.2 shall be deemed a material default by Tenant and shall, if not cured
within ten (10) days after  Tenant's  receipt of written  notice of default from
Landlord,  entitle  Landlord,  at its  election and in its sole  discretion,  to
declare the expansion options terminated and of no further force and effect; the
existence of such termination right, however,  shall be without prejudice to any
other remedies  available to Landlord  under this Lease or under  applicable law
with  respect to Tenant's  breach,  including  (but not limited to) the right to
seek money damages from Tenant for Tenant's  nonpayment of Carrying  Costs.  The
allocation  to Tenant  of  [...*...]  of the  Carrying  Costs  for the  Adjacent
Property is based on the assumption that approximately  [...*...] square feet of
buildings  will be  constructed  on the Adjacent  Property,  of which  [...*...]
square feet will constitute Tenant's expansion space subject to Section 6.3, but
this allocation is not intended to be mathematically  exact or to fluctuate with
minor changes in the size,  design or location of the  buildings  planned for or
actually constructed on the Adjacent Property.

         6.3 Exercise of Phase II Expansion Options.  Contingent upon Landlord's
acquisition of the Adjacent Property,  Tenant shall have the right, on the terms
and  conditions  set forth in this Section 6.3 and subject to the  provisions of
Section  4.1(d)  above,  to elect to have Landlord  construct,  for occupancy by
Tenant as expansion space, up to [...*...] square feet of space in new two-story
buildings to be  constructed  by Landlord at the  northerly  end of the Adjacent
Property.  The Site Plan attached hereto  designates as "Phase II" two buildings
of [...*...] square feet and [...*...] square feet, respectively; those building
sizes and locations are illustrative  only, and are not to be construed as being
binding on Landlord or Tenant.

                  (a) At any time  within the period  beginning  on the later of
the Rent  Commencement  Date or the date on which Landlord acquires the Adjacent
Property and ending on the date which is [...*...]  after the Rent  Commencement
Date (the "Phase IIA Option


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                                       16

<PAGE>


Period"),  Tenant  shall have the right (the  "Phase IIA  Expansion  Option") to
elect by written  notice to  Landlord to occupy up to  [...*...]  square feet of
space in the  building(s) to be constructed at the northerly end of the Adjacent
Property  (the  quantity of space thus  designated  by Tenant being  hereinafter
called the "Phase IIA  Expansion  Premises").  There is no minimum  size for the
Phase  IIA  Expansion  Premises,  but if the  size of the  Phase  IIA  Expansion
Premises as designated by Tenant is not at least [...*...] square feet, then the
Phase IIB  Expansion  Option shall not come into effect and Tenant shall have no
further  expansion options  hereunder.  If Tenant timely exercises the Phase IIA
Expansion  Option,  then Landlord and Tenant shall  negotiate  diligently and in
good  faith  toward a new  lease or  lease  amendment  covering  the  Phase  IIA
Expansion Premises in accordance with Section 6.3(c) hereof.

                  (b) At any time  within  the period  beginning  on the date of
expiration  of the Phase  IIA  Option  Period  and  ending on the date  which is
[...*...] thereafter (the "Phase IIB Option Period"), if Tenant timely exercised
the Phase IIA Expansion  Option for at least [...*...]  square feet and for less
than [...*...] square feet of space, Tenant shall have the right (the "Phase IIB
Expansion  Option")  to elect by further  written  notice to  Landlord to occupy
additional space in an amount up to the difference between the size of the Phase
IIA  Expansion  Premises and [...*...]  square feet,  again to be located in the
building(s) to be constructed at the northerly end of the Adjacent Property (the
quantity  of space  thus  designated  by Tenant  in such  further  notice  being
hereinafter  called  the  "Phase  IIB  Expansion  Premises").  If Tenant  timely
exercises  the Phase IIB  Expansion  Option,  then  Landlord  and  Tenant  shall
negotiate  diligently  and in good faith  toward a new lease or lease  amendment
covering the Phase IIB  Expansion  Premises in  accordance  with Section  6.3(c)
hereof.  If Tenant does not timely  exercise the Phase IIB  Expansion  Option or
does not exercise that option in such a way that the aggregate size of the Phase
IIA Expansion  Premises and the Phase IIB Expansion Premises is [...*...] square
feet, then Tenant's  unexercised  expansion  rights shall lapse or expire at the
end of the Phase IIB Option  Period and shall be of no further  force or effect.
Notwithstanding any other provisions of this Article 6, (i) during the Phase IIB
Option  Period,  Tenant's  obligation  with respect to payment of Carrying Costs
shall be reduced to the fraction or  percentage  calculated by dividing the size
of the space remaining  available  pursuant to the Phase IIB Expansion Option by
[...*...]  square  feet,  and (ii) to the  extent  Tenant  designates  a size of
[...*...]  square feet or more for the Phase IIA Expansion  Premises  and/or the
Phase IIB Expansion  Premises,  Tenant shall be entitled to have each such phase
constituting  [...*...]  square feet or more designed as a stand-alone  building
with Tenant as the sole occupant.

                  (c) The parties contemplate that except as Landlord and Tenant
may  otherwise  agree at the time,  the  general  structure  of a lease or lease
amendment  for the Phase IIA Expansion  Premises  and/or the Phase IIB Expansion
Premises,  as applicable,  shall include  Landlord's  construction of a building
shell or shells on  substantially  the same  economic  terms  applicable  to the
Initial Building (as reflected in this Lease), but adjusted to take into account
changes in costs of land  acquisition,  costs of construction  and cost of money
(determined by


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                                       17

<PAGE>


reference to changes in the Bank of America  prime  rate).  The location of such
building(s)  shall be  determined  by  Landlord  in its  reasonable  discretion;
Landlord agrees to give reasonable  consideration to Tenant's then current needs
and future  plans (as  communicated  to Landlord  at the time) in  planning  the
location of the  expansion  building(s),  but the final  decision  with  respect
thereto shall be Landlord's.  The  construction and financing of interior tenant
improvements in the expansion  building(s) shall be open for negotiation between
Landlord  and Tenant;  Landlord is not  required to agree to  construct  or fund
tenant  improvements  and  Tenant  is not  required  to agree  to have  Landlord
construct or fund them, except that Landlord agrees,  if Tenant so requests,  to
finance  construction of tenant  improvements of a nature and quality  generally
comparable  to those  to be  constructed  in the  Initial  Building  on the same
[...*...]  basis  provided  in this  Lease for the  Tenant  Improvements  in the
Initial  Building.  The rent  structure for the Phase IIA Expansion  Premises or
Phase IIB  Expansion  Premises,  as  applicable,  shall  take into  account,  in
addition to the cost  factors  mentioned  above,  any required  construction  or
funding of tenant  improvements by Landlord,  and shall also reflect any changes
in Tenant's financial condition at that time. Stock warrants with respect to the
expansion  premises  shall be issuable in accordance  with Section 4.1(b) or (c)
hereof,  as applicable.  The lease term for the Phase IIA Expansion  Premises or
Phase IIB Expansion  Premises,  as applicable,  shall be fifteen (15) years;  in
order to provide for coterminous  lease terms,  (i) upon execution of a lease or
lease amendment for the Phase IIA Expansion  Premises,  the Termination Date for
this Lease with respect to the Initial  Building  under Section 2.1 hereof shall
be deemed to be extended until the expiration  date for the 15-year term for the
Phase IIA Expansion Premises, with all other terms of this Lease relating to the
Initial  Building to remain the same (and with minimum rental to remain fixed at
the level applicable immediately prior to commencement of the extension period),
and (ii)  upon  execution  of a lease  or  lease  amendment  for the  Phase  IIB
Expansion  Premises,  the  Termination  Date for this Lease with  respect to the
Initial Building under Section 2.1 hereof and the termination date for the Phase
IIA Expansion  Premises shall be deemed to be extended until the expiration date
for the 15-year term for the Phase IIB Expansion Premises,  with all other terms
of this Lease  relating  to the Initial  Building  and all terms of the lease or
lease  amendment with respect to the Phase IIA Expansion  Premises to remain the
same  (and  with  minimum  rental  to  remain  fixed in both  cases at the level
applicable immediately prior to commencement of the extension period).


                    7. REFUSAL RIGHTS WITH RESPECT TO LEASES

         7.1      Refusal Rights.

                  (a) If Landlord intends during the term of this Lease to lease
all or any portion of the Refusal Space (as hereinafter defined),  and if Tenant
is not then in material  default (beyond any applicable cure periods) under this
Lease (for which purpose, without limitation, any event of default under Section
18.1 hereof shall be considered "material"), Landlord shall


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<PAGE>


first give written notice of such  intention to Tenant,  specifying the material
terms on which Landlord  proposes to lease the Refusal Space or portion  thereof
(the "Offered  Space"),  and shall offer to Tenant the  opportunity to lease the
Offered  Space on the terms  specified in Landlord's  notice.  Tenant shall have
seven (7) business  days after the date of Tenant's  receipt of such notice from
Landlord in which to accept such offer by written notice to Landlord.  Upon such
acceptance  by Tenant,  the Offered Space shall be leased to Tenant on the terms
set forth in Landlord's  notice and on the  additional  terms and provisions set
forth  herein  (except  to the extent  inconsistent  with the terms set forth in
Landlord's said notice),  and the parties shall promptly execute an amendment to
this Lease adding the Offered  Space to the  premises  covered by this Lease and
making  any  appropriate  amendments  to  provisions  of this  Lease to  reflect
different rent and other  obligations  applicable to the Offered Space under the
terms of  Landlord's  said notice.  If Tenant does not accept  Landlord's  offer
within the allotted time,  Landlord shall thereafter have the right to lease the
Offered Space to a third party, at any time within [...*...] days after Tenant's
failure to accept  Landlord's  offer, at a minimum rental and on other terms and
conditions  not more  favorable to the lessee than the minimum  rental and other
terms  offered to Tenant in said  Landlord's  notice.  If Tenant does not accept
Landlord's  offer and Landlord does not lease the Offered Space to a third party
within  [...*...]  days,  Tenant's  refusal  right under this  Section 7.1 shall
reattach to that space.

                  (b) For purposes of this  Section 7.1, the areas  constituting
the "Refusal Space" and the priority of Tenant's  refusal rights with respect to
such areas are as follows:

                           (i) Until the later of December  31, 1997 or the date
         Landlord enters into an unconditional binding contract or contracts for
         the  acquisition  of the  Adjacent  Property (as defined in Section 6.1
         hereof in connection with Tenant's expansion rights), the Refusal Space
         shall  include any and all space in the new building to be  constructed
         in the area marked as  "Alternate  Expansion"  (Building C) on the Site
         Plan; after the later of the dates specified in this subparagraph, such
         Building C space shall no longer  constitute  part of the Refusal Space
         and Tenant shall have no further  refusal rights with respect  thereto.
         Notwithstanding  any other  provisions  of this Section  7.1,  Tenant's
         refusal  right with  respect to the  Building C portion of the  Refusal
         Space is a second refusal right,  junior in priority to existing rights
         in favor of Cor Therapeutics, Inc.

                           (ii)  Until  the  date   Landlord   enters   into  an
         unconditional  binding contract or contracts for the acquisition of the
         Adjacent  Property (as defined in Section 6.1 hereof in connection with
         Tenant's expansion rights), the Refusal Space shall include any and all
         space in the existing  buildings  designated as Buildings D, E, F and G
         on the Site Plan; after the date specified in this  subparagraph,  such
         Building  D, E, F and G space  shall no longer  constitute  part of the
         Refusal  Space and Tenant  shall have no further  refusal  rights  with
         respect thereto.  Notwithstanding  any other provisions of this Section
         7.1, Tenant's refusal right with respect to the Building D, E, F and G


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                                       19

<PAGE>


         portion of the  Refusal  Space is junior in  priority  to all  existing
         rights in favor of Cor Therapeutics,  Inc. and/or in favor of any other
         existing tenants of the Center.

                           (iii) If Landlord  acquires the Adjacent Property (as
         defined in Section 6.1 hereof in  connection  with  Tenant's  expansion
         rights) and Tenant  timely  exercises  its Phase IIA  Expansion  Option
         under Section 6.3(a) hereof for at least [...*...] square feet of space
         on the Adjacent  Property,  then after the  expiration of the Phase IIB
         Option Period as defined in Section  6.3(b)  hereof,  the Refusal Space
         shall  include any and all space not already  occupied by Tenant in the
         buildings existing from time to time on the Adjacent Property. Tenant's
         refusal  right with respect to  buildings  located from time to time on
         the  Adjacent  Property is a first  refusal  right and is not junior in
         priority to any other  existing  rights in favor of any other person or
         entity.

                           (iv) For purposes of this Section 7.1(b),  a contract
         for  acquisition of the Adjacent  Property or any portion thereof shall
         be deemed to be  "unconditional"  when all "due  diligence"  conditions
         have been waived and the contract  remains  subject only to  conditions
         that are customarily satisfied only at the closing date, including (but
         not limited to) conditions  relating to the seller's  delivery of title
         and the title company's issuance of a title policy insuring  Landlord's
         title as buyer subject only to the permitted  exceptions defined in the
         purchase contract.


                                    8. TAXES

         8.1 Personal  Property.  Tenant shall be responsible  for and shall pay
prior to delinquency  all taxes and  assessments  levied against or by reason of
(a) any and all  alterations,  additions  and items  installed  or placed on the
Property and taxed as personal property rather than as real property, and/or (b)
all personal property,  trade fixtures and other property placed by Tenant on or
about the Property. Upon request by Landlord, Tenant shall furnish Landlord with
satisfactory  evidence of Tenant's  payment  thereof.  If at any time during the
term of this Lease any of said  alterations,  additions  or  personal  property,
whether or not  belonging  to Tenant,  shall be taxed or assessed as part of the
Center,  then such tax or assessment  shall be paid by Tenant to Landlord within
fifteen (15) days after  presentation  by Landlord of copies of the tax bills in
which such taxes and  assessments  are included  and shall,  for the purposes of
this Lease,  be deemed to be personal  property taxes or assessments  under this
Section 8.1.

         8.2  Real  Property.   To  the  extent  any  real  property  taxes  and
assessments on the Property  (including,  but not limited to, the  Improvements)
are assessed  directly to Tenant,  Tenant shall be responsible for and shall pay
prior to delinquency all such taxes and assessments levied against the Property.
Upon  request by Landlord,  Tenant  shall  furnish  Landlord  with  satisfactory
evidence of Tenant's payment thereof. To the extent the Property and/or


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<PAGE>


Improvements are taxed or assessed to Landlord  following the Rent  Commencement
Date,  such real  property  taxes and  assessments  shall  constitute  Operating
Expenses  (as that term is defined in  Section  9.2 of this  Lease) and shall be
paid in accordance with the provisions of Article 9 of this Lease.


                              9. OPERATING EXPENSES

         9.1      Payment Of Operating Expenses.

                  (a)  Tenant  shall  pay to  Landlord,  at the  time and in the
manner hereinafter set forth, as additional rental, an amount equal to [...*...]
("Tenant's  Operating Cost Share") of the Operating  Expenses defined in Section
9.2.

                  (b)  Tenant's  Operating  Cost Share as specified in paragraph
(a) of this Section is based upon an estimated area of [...*...] square feet for
the Initial Building and upon an aggregate area of [...*...] square feet for the
existing buildings owned by Landlord in the Center (Buildings D, E, F and G) and
the two  additional  buildings that Landlord is committed to build in the Center
(the Initial  Building and Building H, as designated  on the Site Plan).  If the
actual area of the Initial Building (when completed), of the premises covered by
this  Lease or of the  buildings  owned  from  time to time by  Landlord  in the
Center,  as  determined  in good faith by  Landlord's  architect on the basis of
measurement set forth in Section 3.1(b) hereof, differs from the assumed numbers
set forth above, then Tenant's Operating Cost Share shall be adjusted to reflect
the actual areas so determined.

                  (c) If Landlord constructs additional buildings in the Center,
on the Adjacent Property or on any other adjacent property owned by Landlord and
operated,  for common area purposes, on an integrated basis with the Center from
time to time, Tenant's Operating Cost Share shall be adjusted to be equal to the
percentage  determined  by  dividing  the gross  square  footage of the  Initial
Building as it then exists by the gross square footage of all buildings  located
in the Center, on the Adjacent  Property or on any applicable  adjacent property
owned by Landlord as described above. In determining said percentage, a building
shall be taken  into  account  from and after  the date on which a tenant  first
enters into possession of the building or a portion thereof,  and the good faith
determination  of the gross square  footage of any such  building by  Landlord's
architects shall be final and binding upon the parties.

         9.2      Definition Of Operating Expenses.

                  (a)  Subject  to the  exclusions  and  provisions  hereinafter
contained, the term "Operating Expenses" shall mean the total costs and expenses
incurred by or allocable to Landlord for  management,  operation and maintenance
of the Improvements, the Property and


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                                       21

<PAGE>


the Center, including,  without limitation,  costs and expenses of (i) insurance
(which may include, at Landlord's option,  earthquake insurance as part of or in
addition to any casualty or property  insurance  policy),  property  management,
landscaping,  and the operation,  repair and maintenance of buildings and Common
Areas;  (ii) all utilities and services;  (iii) real and personal property taxes
and assessments or substitutes therefor levied or assessed against the Center or
any part thereof,  including (but not limited to) any possessory interest,  use,
business, license or other taxes or fees, any taxes imposed directly on rents or
services,  any  assessments or charges for police or fire  protection,  housing,
transit,  open space,  street or sidewalk  construction  or maintenance or other
similar  services from time to time by any  governmental  or  quasi-governmental
entity, and any other new taxes on landlords in addition to taxes now in effect;
(iv) supplies, equipment, utilities and tools used in management,  operation and
maintenance  of the  Center;  (v)  capital  improvements  to the  Property,  the
Improvements  or the Center,  amortized  over a  reasonable  period,  (aa) which
reduce or will cause future  reduction of other items of Operating  Expenses for
which Tenant is otherwise  required to  contribute or (bb) which are required by
law,  ordinance,  regulation or order of any  governmental  authority or (cc) of
which  Tenant  has use or  which  benefit  Tenant;  and  (vi)  any  other  costs
(including,  but not limited to, any parking or  utilities  fees or  surcharges)
allocable  to or paid by  Landlord,  as owner  of the  Center  or  Improvements,
pursuant  to any  applicable  laws,  ordinances,  regulations  or  orders of any
governmental  or  quasi-governmental  authority  or pursuant to the terms of any
declarations  of  covenants,   conditions  and  restrictions  now  or  hereafter
affecting  the Center or over which  Tenant has  non-exclusive  usage  rights as
contemplated in Section 1.1(b) hereof.  Operating Expenses shall not include any
costs  attributable  to the work for which  Landlord  is  required  to pay under
Article 5 or Exhibit C, nor any costs  attributable to the initial  construction
of buildings or Common Area improvements in the Center. The distinction  between
items of ordinary operating maintenance and repair and items of a capital nature
shall  be made in  accordance  with  generally  accepted  accounting  principles
applied on a consistent  basis or in accordance with tax accounting  principles,
as determined in good faith by Landlord's accountants.

                  (b) Notwithstanding anything to the contrary contained in this
Lease, the following shall not be included within Operating Expenses:

                           (i)  Costs  of  maintenance  or  repair  of the  roof
membrane for any building  within the Center,  except during periods (if any) in
which costs of  maintenance  or repair of the roof membrane for the  building(s)
occupied by Tenant pursuant to this Lease are likewise  included as an Operating
Expense  (rather  than  being  incurred  directly  by Tenant  or passed  through
directly to Tenant on a building-by-building basis);

                           (ii) Leasing  commissions,  attorneys'  fees,  costs,
disbursements,  and other expenses  incurred in connection with  negotiations or
disputes with tenants,  or in connection  with leasing,  renovating or improving
space for tenants or other  occupants or prospective  tenants or other occupants
of the Center;


                                       22

<PAGE>


                           (iii)  The  cost of any  service  sold to any  tenant
(including  Tenant) or other  occupant  for which  Landlord  is  entitled  to be
reimbursed as an  additional  charge or rental over and above the basic rent and
operating expenses payable under the lease with that tenant;

                           (iv) Any  depreciation on the Initial  Building or on
any other improvements in the Center;

                           (v)  Expenses in  connection  with  services or other
benefits of a type that are not offered or made available to Tenant but that are
provided to another tenant of the Center;

                           (vi) Costs  incurred due to  Landlord's  violation of
any terms or  conditions  of this Lease or of any other  lease  relating  to the
Initial Building or to any other portion of the Center or the Property;

                           (vii)  Overhead   profit   increments   paid  to  any
subsidiary or affiliate of Landlord for  management  or other  services on or to
the Center or any  portion  thereof or for  supplies or other  materials  to the
extent that the cost of the  services,  supplies or  materials  exceeds the cost
that would have been paid had the services,  supplies or materials been provided
by unaffiliated parties on a competitive basis;

                           (viii)  All  interest,  loan fees and other  carrying
costs  related to any mortgage or deed of trust or related to any capital  item,
and all rental and other amounts  payable under any ground or underlying  lease,
or under any lease for any  equipment  ordinarily  considered to be of a capital
nature  (except (A)  janitorial  equipment  which is not affixed to the Building
and/or (B)  equipment the cost of which,  if  purchased,  would be considered an
amortizable  Operating  Expense  under  the  provisions  of  this  Section  9.2,
notwithstanding the capital nature of such equipment);

                           (ix) Any compensation  paid to clerks,  attendants or
other persons in commercial concessions operated by Landlord;

                           (x) Advertising and promotional expenditures;

                           (xi) Costs of repairs  and other work  occasioned  by
fire,  windstorm or other casualty of an insurable nature,  except to the extent
of any  applicable  deductible  amounts  under  insurance  actually  carried  by
Landlord;

                           (xii) Any costs,  fines or penalties  incurred due to
violations by Landlord of any governmental rule or authority or of this Lease or
any  other  lease  of any  portion  of the  Center  or the  Property,  or due to
Landlord's negligence or willful misconduct;


                                       23

<PAGE>



                           (xiii)  Management  costs to the extent they exceed a
reasonable and  competitive  rate for such services in the market for management
of comparable commercial properties in the San Francisco Bay Area;

                           (xiv) Costs for sculpture, paintings or other objects
of art, and for any insurance  thereon or  extraordinary  security in connection
therewith;

                           (xv) Wages,  salaries or other  compensation  paid to
any executive employees above the grade of building manager;

                           (xvi) The cost of  correcting  any  building  code or
other violations which were violations prior to the Rent Commencement Date;

                           (xvii) The cost of containing,  removing or otherwise
remediating any contamination of the Property (including the underlying land and
groundwater) by any toxic or hazardous materials (including, without limitation,
asbestos and PCBs); and

                           (xviii) Premiums for earthquake  insurance  coverage,
but only to the extent (if any) that such  premiums  exceed,  in any  applicable
period, a commercially reasonable rate, taking into account all relevant factors
(including, but not limited to, the nature, size and location of the Center, the
nature and value of the  improvements  therein that are owned by or insurable by
Landlord,  and  the  general  availability  and  cost of  commercial  earthquake
insurance in the insurance markets existing from time to time during the term of
this Lease).

         9.3  Determination  Of  Operating  Expenses.  On  or  before  the  Rent
Commencement Date and during the last month of each calendar year of the term of
this Lease ("Lease Year"),  or as soon  thereafter as practical,  Landlord shall
provide Tenant notice of Landlord's  estimate of the Operating  Expenses for the
ensuing Lease Year or applicable portion thereof.  On or before the first day of
each  month  during  the  ensuing  Lease  Year or  applicable  portion  thereof,
beginning on the Rent  Commencement  Date, Tenant shall pay to Landlord Tenant's
Operating  Cost  Share  of the  portion  of such  estimated  Operating  Expenses
allocable (on a prorata basis) to such month;  provided,  however,  that if such
notice is not given in the last month of a Lease Year,  Tenant shall continue to
pay on the basis of the prior  year's  estimate,  if any,  until the month after
such notice is given.  If at any time or times it appears to  Landlord  that the
actual  Operating  Expenses  will vary  from  Landlord's  estimate  by more than
[...*...],  Landlord may, by notice to Tenant, revise its estimate for such year
and subsequent payments by Tenant for such year shall be based upon such revised
estimate.


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*CONFIDENTIAL TREATMENT REQUESTED
                                       24

<PAGE>


         9.4      Final Accounting For Lease Year.

                  (a)  Within  ninety  (90) days  after the close of each  Lease
Year, or as soon after such 90-day period as practicable, Landlord shall deliver
to Tenant a statement of Tenant's Operating Cost Share of the Operating Expenses
for such Lease Year  prepared by Landlord  from  Landlord's  books and  records,
which  statement  shall be final and binding on Landlord  and Tenant  (except as
provided in Section  9.4(b)).  If on the basis of such statement  Tenant owes an
amount  that is more or less than the  estimated  payments  for such  Lease Year
previously made by Tenant, Tenant or Landlord, as the case may be, shall pay the
deficiency  to the other party  within  thirty  (30) days after  delivery of the
statement.  Failure or  inability  of Landlord  to deliver the annual  statement
within such ninety (90) day period  shall not impair or  constitute  a waiver of
Tenant's  obligation to pay Operating  Expenses,  or cause Landlord to incur any
liability for damages.

                  (b) At any time  within  three (3)  months  after  receipt  of
Landlord's  annual  statement of Operating  Expenses as  contemplated in Section
9.4(a), Tenant shall be entitled, upon reasonable written notice to Landlord and
during  normal  business  hours at  Landlord's  office or such  other  places as
Landlord  shall  designate,  to inspect and  examine  those books and records of
Landlord relating to the determination of Operating Expenses for the immediately
preceding Lease Year covered by such annual statement or, if Tenant so elects by
written notice to Landlord,  to request an  independent  audit of such books and
records.  The independent audit of the books and records shall be conducted by a
certified  public  accountant  acceptable to both Landlord and Tenant or, if the
parties are unable to agree, by a certified public  accountant  appointed by the
Presiding  Judge of the San Mateo County  Superior Court upon the application of
either  Landlord or Tenant (with notice to the other  party).  In either  event,
such certified  public  accountant  shall be one who is not then employed in any
capacity  by Landlord or Tenant or by any of their  respective  affiliates.  The
audit shall be limited to the determination of the amount of Operating  Expenses
for the subject Lease Year, and shall be based on generally accepted  accounting
principles  and  tax  accounting  principles,  consistently  applied.  If  it is
determined,  by mutual agreement of Landlord and Tenant or by independent audit,
that the  amount of  Operating  Expenses  billed  to or paid by  Tenant  for the
applicable Lease Year was incorrect, then the appropriate party shall pay to the
other party the deficiency or  overpayment,  as  applicable,  within thirty (30)
days after the final determination of such deficiency or overpayment.  All costs
and  expenses of the audit  shall be paid by Tenant  unless the audit shows that
Landlord  overstated  Operating Expenses for the subject Lease Year by more than
[...*...], in which case Landlord shall pay all costs and expenses of the audit.
Each party agrees to maintain the  confidentiality  of the findings of any audit
in accordance with the provisions of this Section 9.4.

         9.5 Proration.  If the Rent Commencement Date falls on a day other than
the first day of a Lease  Year or if this Lease  terminates  on a day other than
the last day of a Lease Year, the


- ---------------------------
*CONFIDENTIAL TREATMENT REQUESTED
                                       25

<PAGE>


amount of  Operating  Expenses  payable by Tenant with  respect to such first or
last partial  Lease Year shall be prorated on the basis which the number of days
during  such  Lease  Year in which  this  Lease is in effect  bears to 365.  The
termination  of this Lease  shall not affect the  obligations  of  Landlord  and
Tenant pursuant to Section 9.4 to be performed after such termination.


                                  10. UTILITIES

         10.1 Payment. Commencing with the Rent Commencement Date and thereafter
throughout the term of this Lease,  Tenant shall pay,  before  delinquency,  all
charges for water, gas, heat, light, electricity, power, sewer, telephone, alarm
system, janitorial and other services or utilities supplied to or consumed in or
upon  the  Property  (other  than  any  separately   metered  costs  for  water,
electricity or other services or utilities  furnished with respect to the Common
Areas,  which  costs shall be paid by Landlord  and shall  constitute  Operating
Expenses  under  Section 9.2 hereof),  including  any taxes on such services and
utilities.  It is the intention of the parties that all such  services  shall be
separately  metered  to the  Property.  In the event  that any of such  services
supplied to the Property are not  separately  metered,  then the amount  thereof
shall be an item of Operating  Expenses and shall be paid as provided in Article
9.

         10.2 Interruption. There shall be no abatement of rent or other charges
required to be paid  hereunder  and  Landlord  shall not be liable in damages or
otherwise for interruption or failure of any service or utility  furnished to or
used on the Property  because of  accident,  making of repairs,  alterations  or
improvements,  severe weather,  difficulty or inability in obtaining services or
supplies,  labor difficulties or any other cause.  Notwithstanding the foregoing
provisions of this Section 10.2,  however,  in the event of any  interruption or
failure of any service or utility to the Premises that (i) is caused in whole or
in material part by the active  negligence or willful  misconduct of Landlord or
its agents or employees and (ii) continues for more than three (3) business days
and (iii)  materially  impairs  Tenant's  ability to use the  Premises for their
intended purposes hereunder,  then following such three (3) business day period,
Tenant's  obligations  for  payment of rent and other  charges  under this Lease
shall be abated in proportion to the degree of impairment of Tenant's use of the
Premises,  and such abatement  shall continue until Tenant's use of the Premises
is no longer materially impaired thereby.


                             11. ALTERATIONS; SIGNS

         11.1  Right To Make  Alterations.  Tenant  shall  make no  alterations,
additions or  improvements to the Initial  Building or the Property,  other than
interior non-structural alterations costing less than [...*...] in the aggregate
during any twelve  (12)  month  period,  without  the prior  written  consent of
Landlord,  which consent shall not be unreasonably withheld or delayed. All such
alterations, additions and improvements shall be completed with due diligence in
a first-


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*CONFIDENTIAL TREATMENT REQUESTED
                                       26

<PAGE>


class workmanlike  manner, in compliance with plans and specifications  approved
in writing by Landlord and in compliance with all applicable  laws,  ordinances,
rules and regulations.  Tenant shall cause any contractors engaged by Tenant for
work in the Initial Building or on the Property to maintain public liability and
property damage insurance, and other customary insurance, with such terms and in
such amounts as Landlord may reasonably  require,  naming as additional insureds
Landlord and any of its partners,  shareholders,  property  managers and lenders
designated  by  Landlord  for this  purpose,  and shall  furnish  Landlord  with
certificates of insurance or other evidence that such coverage is in effect.  In
addition, Tenant covenants and agrees that all contractors and subcontractors at
any tier performing any tenant improvements,  build-out, alterations, additions,
improvements,  renovations,  repairs and/or  installations  of fixtures or other
equipment,  or with  respect  to any  other  construction  work in, on or to the
Premises  shall  (i)  be  bound  by and  signatory  to a  collective  bargaining
agreement with a labor  organization (A) whose  jurisdiction  covers the type of
work  to be  performed  on the  Premises,  and (B) who is  affiliated  with  the
Building and Construction  Trades Department of the AFL-CIO;  and (ii) each such
contractor or  subcontractor  shall  observe area  standards for wages and other
terms and conditions of employment,  including fringe benefits.  Notwithstanding
any other provisions of this Section 11.1,  under no circumstances  shall Tenant
make any structural  alterations or improvements,  or any substantial changes to
the roof or substantial equipment  installations on the roof, or any substantial
changes or alterations to the building systems, without Landlord's prior written
consent (which consent shall not be unreasonably withheld or delayed). If Tenant
so requests  in seeking  Landlord's  consent to any  alterations,  additions  or
improvements,  Landlord shall specify in granting such consent whether  Landlord
intends  to  require  that  Tenant   remove  such   alterations,   additions  or
improvements (or any specified  portions thereof) upon expiration or termination
of this Lease. Landlord shall receive no fee for supervision,  profit,  overhead
or  general  conditions  in  connection  with  any  alterations,   additions  or
improvements constructed or installed by Tenant under this Lease.

         11.2 Title To Alterations. All alterations,  additions and improvements
installed in, on or about the Initial Building or the Property shall become part
of the  Property and shall  become the  property of  Landlord,  unless  Landlord
elects to require Tenant to remove the same upon the  termination of this Lease;
provided,  however,  that the  foregoing  shall  not apply to  Tenant's  movable
furniture and equipment and trade  fixtures.  Tenant shall  promptly  repair any
damage caused by its removal of any such furniture, equipment or trade fixtures.
Notwithstanding  any other provisions of this Article 11, however,  (a) under no
circumstances shall Tenant have any right to remove from the Initial Building or
the Property,  at the expiration or termination of this Lease,  any lab benches,
fume hoods, cold rooms or other similar  improvements and equipment installed in
the Initial Building,  even if such equipment and improvements were installed by
Tenant and paid for by Tenant in cash or in the form of additional rent; and (b)
if Tenant requests  Landlord's written consent to any alterations,  additions or
improvements  under  Section 11.1 hereof and, in requesting  such consent,  asks
that Landlord specify whether Landlord will require removal of such alterations,
additions or  improvements  upon  termination or expiration of this Lease,  then
Landlord shall not be entitled to require such removal unless


                                       27

<PAGE>


Landlord  specified its intention to do so at the time of granting of Landlord's
consent to the requested alterations, additions or improvements.

         11.3 Tenant Fixtures. Subject to the final sentence of Section 11.2 and
to Section 11.5, Tenant may install, remove and reinstall trade fixtures without
Landlord's  prior written consent,  except that  installation and removal of any
fixtures  which are  affixed to the Initial  Building  or the  Property or which
affect the  exterior  or  structural  portions  of the  Initial  Building or the
building systems shall require Landlord's prior written approval, which approval
shall not be unreasonably  withheld or delayed.  Tenant shall immediately repair
any damage  caused by  installation  and removal of fixtures  under this Section
11.3.

         11.4 No Liens.  Tenant shall at all times keep the Initial Building and
the Property free from all liens and claims of any contractors,  subcontractors,
materialmen,  suppliers  or  any  other  parties  employed  either  directly  or
indirectly  by  Tenant  in  construction  work on the  Initial  Building  or the
Property.  Tenant  may  contest  any claim of lien,  but only if,  prior to such
contest,  Tenant  either (i) posts  security  in the  amount of the claim,  plus
estimated costs and interest,  or (ii) records a bond of a responsible corporate
surety in such  amount as may be  required  to release the lien from the Initial
Building and the  Property.  Tenant shall  indemnify,  defend and hold  Landlord
harmless against any and all liability,  loss, damage,  cost and other expenses,
including, without limitation, reasonable attorneys' fees, arising out of claims
of any lien for work performed or materials or supplies furnished at the request
of Tenant or persons claiming under Tenant. Notwithstanding any other provisions
of this  Lease,  however,  Tenant  shall  have the right to  obtain  third-party
financing  for  Tenant's  share of the  cost of the  Tenant  Improvements  to be
constructed  under the  Workletter,  and for any other equipment or improvements
installed  or  constructed  by Tenant  from time to time  during the term of the
Lease,  and in connection  with such financing shall have the right to grant the
lender a lien on specific items of such Tenant Improvements,  and/or on any such
other  equipment  or  improvements,  having an  aggregate  cost not greater than
Tenant's  share  of the  total  cost  of  the  applicable  Tenant  Improvements,
equipment or other improvements; the specific items of such Tenant Improvements,
equipment  or other  improvements  on which Tenant is  authorized  to grant such
liens shall be  negotiated  and  approved in good faith by Landlord  and Tenant,
promptly and  diligently  following  any written  request by Tenant from time to
time for identification of such items.

         11.5 Signs.  Tenant shall have the right to display its corporate  name
and logo on the  Initial  Building  and in front of the  entrance to the Initial
Building,  subject to Landlord's prior approval as to location, size, design and
composition  (which  approval  shall not be  unreasonably  withheld or delayed),
subject to the  established  sign  criteria  for the  Center and  subject to all
restrictions and requirements of applicable law and of any covenants, conditions
and restrictions and other written agreements now or hereafter applicable to the
Property.  Landlord  is hereby  deemed to have  approved,  as to  location,  any
signage the location of which is expressly  designated on the Site Plan attached
hereto as Exhibit B or on any Approved Plan listed in or


                                       28

<PAGE>


developed  pursuant to the Workletter,  and Landlord agrees that Tenant shall be
permitted  to have  exterior  signage  on at least two (2) sides of the  Initial
Building (facing Highway 101 and facing East Grand Avenue), subject to all other
requirements and criteria set forth above in this Section 11.5.


                           12. MAINTENANCE AND REPAIRS

         12.1     Landlord's Work.

                  (a) Landlord shall repair and maintain or cause to be repaired
and maintained the Common Areas of the Center and the roof (structural  portions
only), exterior walls and other structural portions of the Initial Building. The
cost of all work  performed  by  Landlord  under this  Section  12.1 shall be an
Operating Expense hereunder,  except to the extent such work (i) is required due
to the  negligence  of Landlord,  (ii)  involves the repair or  correction  of a
condition or defect that Landlord is required to correct pursuant to Section 5.2
hereof,  (iii) is a capital expense not includible as an Operating Expense under
Section 9.2 hereof, (iv) is required due to the negligence or willful misconduct
of Tenant or its agents, employees or invitees (in which event Tenant shall bear
the full cost of such work pursuant to the  indemnification  provided in Section
14.6 hereof,  subject to the release set forth in Section 14.4  hereof).  Tenant
knowingly  and  voluntarily  waives  the  right to make  repairs  at  Landlord's
expense,  or to offset the cost thereof  against rent,  under any law,  statute,
regulation or ordinance now or hereafter in effect.

                  (b) If Tenant so  requests  in  writing,  Landlord  shall also
repair and maintain or cause to be repaired or maintained, on the same basis set
forth in Section 12.1(a),  the roof membrane of the Initial Building;  provided,
however,  that the cost of such repair or  maintenance  shall not  constitute an
Operating Expense hereunder, but shall instead be entirely allocated to and paid
by Tenant as the sole lessee of the Initial Building,  except to the extent such
cost falls into one of the  categories set forth in clauses (i) through (iii) of
Section 12.1(a),  in which case Tenant shall to that extent have no liability or
obligation  with  respect  thereto.   Any  such  payment  for  which  Tenant  is
responsible  under this Section  12.1(b)  shall be paid by Tenant to Landlord in
cash within  fifteen  (15) days after  Tenant's  receipt of  Landlord's  written
request  for  such  payment,   accompanied  by  invoices  and  other  supporting
documentation  reasonably  evidencing  the  costs  for  which  such  payment  is
requested.

         12.2     Tenant's Obligation For Maintenance.

                  (a) Good Order,  Condition  And Repair.  Except as provided in
Section 12.1 hereof, Tenant at its sole cost and expense shall keep and maintain
in good and sanitary order,  condition and repair the Initial Building and every
part  thereof,  wherever  located,   including  but  not  limited  to  the  roof
(non-structural  portions only), signs,  interior,  ceiling,  electrical system,
plumbing system,  telephone and communications  systems of the Initial Building,
the HVAC


                                       29

<PAGE>


equipment and related mechanical systems serving the Initial Building (for which
equipment and systems  Tenant shall enter into a service  contract with a person
or entity designated or approved by Landlord),  all doors, door checks, windows,
plate  glass,  door  fronts,  exposed  plumbing  and  sewage  and other  utility
facilities,  fixtures,  lighting,  wall  surfaces,  floor  surfaces  and ceiling
surfaces of the Initial  Building and all other interior  repairs,  foreseen and
unforeseen, with respect to the Initial Building, as required.

                  (b) Landlord's Remedy. If Tenant,  after notice from Landlord,
fails to make or  perform  promptly  any  repairs or  maintenance  which are the
obligation of Tenant hereunder,  Landlord shall have the right, but shall not be
required,  to enter the Property and make the repairs or perform the maintenance
necessary to restore the Property and the Initial  Building to good and sanitary
order,  condition and repair.  Immediately on demand from Landlord,  the cost of
such repairs shall be due and payable by Tenant to Landlord.

                  (c)  Condition  Upon  Surrender.  At the  expiration or sooner
termination of this Lease,  Tenant shall surrender the Initial  Building and the
Improvements,  including any additions,  alterations and  improvements  thereto,
broom clean, in good and sanitary order, condition and repair, ordinary wear and
tear excepted,  first, however, removing all goods and effects of Tenant and all
and  fixtures  and items  required to be removed or  specified  to be removed at
Landlord's  election  pursuant to this Lease, and repairing any damage caused by
such removal. Tenant shall not have the right to remove fixtures or equipment if
Tenant  is  in  default  hereunder  unless  Landlord  specifically  waives  this
provision  in  writing.  Tenant  expressly  waives any and all  interest  in any
personal  property and trade fixtures not removed from the Property by Tenant at
the  expiration  or  termination  of this Lease,  agrees that any such  personal
property and trade fixtures may, at Landlord's election,  be deemed to have been
abandoned  by Tenant,  and  authorizes  Landlord  (at its  election  and without
prejudice to any other  remedies  under this Lease or under  applicable  law) to
remove and to retain,  store or dispose of such  property at  Tenant's  cost and
expense, and Tenant waives all claims against Landlord for any damages resulting
from any such removal, storage, retention or disposal.


                               13. USE OF PROPERTY

         13.1  Permitted Use.  Subject to Sections  13.3,  13.4 and 13.6 hereof,
Tenant  shall use the Initial  Building  solely for a  laboratory  research  and
development  facility,  including (but not limited to) wet chemistry and biology
labs,  clean rooms,  pilot scale,  clinical  scale and GMP scale  manufacturing,
storage  and use of toxic and  radioactive  materials  and  laboratory  animals,
administrative  offices,  and other  lawful  purposes  reasonably  related to or
incidental  to such  specified  uses  (subject  in each case to  receipt  of all
necessary  approvals from the City of South San Francisco and other governmental
agencies having jurisdiction over the Property), and for no other purpose.


                                       30

<PAGE>


         13.2     [Omitted.]

         13.3 No Nuisance.  Tenant shall not use the Property for or carry on or
permit upon the Property or any part thereof any  offensive,  noisy or dangerous
trade,  business,  manufacture,  occupation,  odor or fumes,  or any nuisance or
anything  against  public  policy,  nor interfere with the rights or business of
Landlord in the  Initial  Building  or the  Property,  nor commit or allow to be
committed any waste in, on or about the Property.  Tenant shall not do or permit
anything  to be done in or about  the  Property,  nor  bring  nor keep  anything
therein,  which  will  in  any  way  cause  the  Property  or the  Center  to be
uninsurable with respect to any insurance required by this Lease or with respect
to standard  fire and extended  coverage  insurance  with  vandalism,  malicious
mischief and riot endorsements.

         13.4 Compliance With Laws.  Tenant shall not use the Property or permit
the  Property or any other  portion of the Center to be used in whole or in part
for any purpose or use that is in violation of any applicable laws,  ordinances,
regulations  or rules of any  governmental  agency or public  authority.  Tenant
shall keep the Improvements equipped with all safety appliances required by law,
ordinance or insurance on the Property, or any order or regulation of any public
authority  because of Tenant's  particular  use of the  Property.  Tenant  shall
procure all licenses and permits  required for its use of the  Property.  Tenant
shall use the  Property in strict  accordance  with all  applicable  ordinances,
rules,  laws and  regulations  and shall  comply  with all  requirements  of all
governmental  authorities  now in  force  or  which  may  hereafter  be in force
pertaining to the use of the Property by Tenant, including,  without limitation,
regulations applicable to noise, water, soil and air pollution,  and making such
nonstructural  alterations and additions thereto as may be required from time to
time  by  such  laws,  ordinances,   rules,   regulations  and  requirements  of
governmental   authorities   or   insurers   of  the   Property   (collectively,
"Requirements")  because of Tenant's  construction  of  improvements in or other
particular use of the Property. Any structural alterations or additions required
from time to time by applicable Requirements because of Tenant's construction of
improvements  in the Initial  Building or other  particular  use of the Property
shall, at Landlord's  election,  either (i) be made by Tenant,  at Tenant's sole
cost and expense,  in accordance  with the procedures and standards set forth in
Section 11.1 for alterations by Tenant,  or (ii) be made by Landlord at Tenant's
sole cost and expense, in which event Tenant shall pay to Landlord as additional
rent,  within ten (10) days after  demand by  Landlord,  an amount  equal to all
costs incurred by Landlord in connection with such alterations or additions. The
judgment of any court,  or the  admission  by Tenant in any  proceeding  against
Tenant,  that Tenant has violated any law,  statute,  ordinance or  governmental
rule, regulation or requirement shall be conclusive of such violation as between
Landlord and Tenant.

         13.5  Liquidation  Sales.  Tenant  shall  not  conduct  or permit to be
conducted  any  auction,  bankruptcy  sale,  liquidation  sale,  or going out of
business sale,  in, upon or about the Property,  whether said auction or sale be
voluntary,  involuntary  or  pursuant  to any  assignment  for  the  benefit  of
creditors, or pursuant to any bankruptcy or other insolvency proceeding.


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<PAGE>


         13.6     Environmental Matters.

                  (a) For purposes of this Section,  "hazardous substance" shall
mean the  substances  included  within the  definitions  of the term  "hazardous
substance" under (i) the Comprehensive Environmental Response,  Compensation and
Liability  Act of 1980,  as  amended,  42 U.S.C.  ss.ss.  9601 et seq.,  and the
regulations   promulgated   thereunder,   as   amended,   (ii)  the   California
Carpenter-Presley-Tanner  Hazardous  Substance Account Act,  California Health &
Safety Code ss.ss.  25300 et seq., and regulations  promulgated  thereunder,  as
amended, (iii) the Hazardous Materials Release Response Plans and Inventory Act,
California Heath & Safety Code ss.ss. 25500 et seq., and regulations promulgated
thereunder, as amended, and (iv) petroleum; "hazardous waste" shall mean (i) any
waste listed as or meeting the identified characteristics of a "hazardous waste"
under the Resource  Conservation and Recovery Act of 1976, 42 U.S.C. ss.ss. 6901
et seq., and regulations promulgated pursuant thereto, as amended (collectively,
"RCRA"),  (ii) any waste meeting the  identified  characteristics  of "hazardous
waste,"  "extremely  hazardous waste" or "restricted  hazardous waste" under the
California  Hazardous Waste Control Law,  California Health & Safety Code ss.ss.
25100  et  seq.,  and  regulations  promulgated  pursuant  thereto,  as  amended
(collectively,  the  "CHWCL"),  and/or  (iii) any waste  meeting the  identified
characteristics  of "medical waste" under California Health & Safety Code ss.ss.
25015-25027.8,   and  regulations  promulgated   thereunder,   as  amended;  and
"hazardous  waste  facility"  shall mean a hazardous  waste  facility as defined
under the CHWCL.

                  (b) Without  limiting the  generality of the  obligations  set
forth in Section 13.4 of this Lease:

                           (i) Tenant  shall not cause or permit  any  hazardous
substance  or hazardous  waste to be brought  upon,  kept,  stored or used in or
about the Property without the prior written consent of Landlord,  which consent
shall not be unreasonably  withheld,  except that Tenant, in connection with its
permitted use of the Property as provided in Section 13.1,  may keep,  store and
use materials that constitute  hazardous substances which are customary for such
permitted use,  provided such hazardous  substances are kept, stored and used in
quantities  which are customary for such permitted use and are kept,  stored and
used in full compliance with clauses (ii) and (iii) immediately below.

                           (ii) Tenant  shall comply with all  applicable  laws,
rules,  regulations,  orders,  permits,  licenses  and  operating  plans  of any
governmental  authority with respect to the receipt, use, handling,  generation,
transportation,  storage,  treatment and/or disposal of hazardous  substances or
wastes by Tenant or its agents or  employees,  and Tenant will provide  Landlord
with copies of all permits, licenses,  registrations and other similar documents
that  authorize  Tenant to conduct any such  activities in  connection  with its
authorized use of the Property from time to time.


                                       32

<PAGE>


                           (iii)  Tenant  shall not (A)  operate on or about the
Property any facility  required to be permitted or licensed as a hazardous waste
facility  or for which  interim  status as such is  required,  nor (B) store any
hazardous  wastes on or about the Property for ninety (90) days or more, nor (C)
conduct any other  activities  on or about the Property that could result in the
Property being deemed to be a "hazardous  waste  facility"  (including,  but not
limited to, any storage or treatment of hazardous substances or hazardous wastes
which could have such a result).

                           (iv) Tenant  shall comply with all  applicable  laws,
rules,  regulations,  orders and permits  relating to underground  storage tanks
installed  by Tenant or its  agents or  employees  or at the  request  of Tenant
(including any installation,  monitoring, maintenance, closure and/or removal of
such  tanks) as such tanks are  defined in  California  Health & Safety Code ss.
25281(x),  including,  without  limitation,  complying with California  Health &
Safety Code ss.ss.  25280-25299.7 and the regulations promulgated thereunder, as
amended.  Tenant  shall  furnish to  Landlord  copies of all  registrations  and
permits  issued  to or  held  by  Tenant  from  time  to  time  for  any and all
underground storage tanks located on or under the Property.

                           (v) If applicable,  Tenant shall provide  Landlord in
writing the following  information and/or documentation within fifteen (15) days
after the Rent  Commencement  Date,  and shall update such  information at least
annually,  on or before  each  anniversary  of the Rent  Commencement  Date,  to
reflect  any  change  in  or  addition  to  the  required   information   and/or
documentation (provided, however, that in the case of the materials described in
subparagraphs  (B),  (C) and (E) below,  Tenant shall not be required to deliver
copies of such materials to Landlord but shall maintain copies of such materials
to such extent and for such  periods as may be required  by  applicable  law and
shall permit Landlord or its  representatives to inspect and copy such materials
during normal  business hours at any time and from time to time upon  reasonable
notice to Tenant):

                                    (A)  A  list  of  all  hazardous  substances
and/or  wastes that  Tenant  receives,  uses,  handles,  generates,  transports,
stores,  treats  or  disposes  of  from  time to time  in  connection  with  its
operations on the Property.

                                    (B)  All   Material   Safety   Data   Sheets
("MSDS's"),  if any,  required to be  completed  with respect to  operations  of
Tenant at the Property from time to time in accordance with Title 26, California
Code of  Regulations  ss.  8-5194  or 42 U.S.C.  ss.  11021,  or any  amendments
thereto, and any Hazardous Materials Inventory Sheets that detail the MSDS's.

                                    (C)  All  hazardous   waste   manifests  (as
defined in Title 26, California Code of Regulations ss. 22-66481),  if any, that
Tenant  is  required  to  complete  from  time to time in  connection  with  its
operations at the Property.


                                       33

<PAGE>


                                    (D)  A  copy  of  any  Hazardous   Materials
Management  Plan required from time to time with respect to Tenant's  operations
at the  Property,  pursuant to California  Health & Safety Code ss.ss.  25500 et
seq., and any regulations promulgated thereunder, as amended.

                                    (E)  Any  Contingency  Plans  and  Emergency
Procedures  required  of  Tenant  from  time to time  due to its  operations  in
accordance  with Title 26,  California  Code of Regulations  ss.ss.  22-67140 et
seq., and any amendments thereto, and any Training Programs and Records required
under Title 26, California Code of Regulations, ss. 22-67105, and any amendments
thereto.

                                    (F)  Copies of any  biennial  reports  to be
furnished to the  California  Department  of Health  Services  from time to time
relating to hazardous  substances  or wastes,  pursuant to Title 26,  California
Code of Regulations, ss. 22-66493, and any amendments thereto.

                                    (G)  Copies  of  all  industrial  wastewater
discharge  permits  issued to or held by Tenant from time to time in  connection
with its operations on the Property.

                                    (H) Copies of any other lists or inventories
of hazardous  substances  and/or  wastes on or about the Property that Tenant is
otherwise  required to prepare and file from time to time with any  governmental
or regulatory authority.

                           (vi) Tenant shall  secure  Landlord's  prior  written
approval  for any  proposed  receipt,  storage,  possession,  use,  transfer  or
disposal of  "radioactive  materials"  or  "radiation,"  as such  materials  are
defined in Title 26,  California Code of  Regulations  ss. 17-30100,  and/or any
other  materials  possessing  the  characteristics  of the materials so defined,
which  approval  Landlord  may  withhold  in its sole and  absolute  discretion;
provided, that such approval shall not be required for any radioactive materials
for which Tenant has secured  prior written  approval of the Nuclear  Regulatory
Commission  and  delivered  to  Landlord  a copy of such  approval.  Tenant,  in
connection with any such authorized receipt, storage,  possession, use, transfer
or disposal of radioactive materials or radiation, shall:

                                    (A) Comply with all federal, state and local
laws, rules,  regulations,  orders, licenses and permits issued to or applicable
to Tenant with respect to its business operations on the Property;

                                    (B)  Maintain,  to such  extent and for such
periods as may be  required  by  applicable  law,  and permit  Landlord  and its
representatives  to inspect  during normal  business  hours at any time and from
time to  time  upon  reasonable  notice  to  Tenant,  a list of all  radioactive
materials  or  radiation  received,  stored,  possessed,  used,  transferred  or
disposed of by Tenant or in connection  with the operation of Tenant's  business
on the Property from time


                                       34

<PAGE>


to time,  to the extent not already  disclosed  through  delivery of a copy of a
Nuclear  Regulatory  Commission  approval with respect  thereto as  contemplated
above; and

                                    (C)  Maintain,  to such  extent and for such
periods  as may be  required  by  applicable  law,  and permit  Landlord  or its
representatives  to inspect  during normal  business  hours at any time and from
time to time  upon  reasonable  notice to  Tenant,  all  licenses,  registration
materials,  inspection  reports,  governmental  orders and permits in connection
with the receipt, storage,  possession, use, transfer or disposal of radioactive
materials or radiation by Tenant or in connection with the operation of Tenant's
business on the Property from time to time.

                           (vii) Tenant shall comply with any and all applicable
laws, rules,  regulations and orders of any governmental  authority with respect
to the release into the  environment  of any  hazardous  wastes or substances or
radiation or radioactive materials by Tenant or its agents or employees.  Tenant
shall give Landlord  immediate verbal notice of any unauthorized  release of any
such hazardous  wastes or substances or radiation or radioactive  materials into
the  environment,  and shall follow such verbal  notice with  written  notice to
Landlord  of such  release  within  twenty-four  (24) hours of the time at which
Tenant became aware of such release.

                           (viii)  Tenant  shall  indemnify,   defend  and  hold
Landlord harmless from and against any and all claims,  losses  (including,  but
not limited to, loss of rental income), damages, liabilities,  costs, legal fees
and expenses of any sort arising out of or relating to (A) any failure by Tenant
to comply with any provisions of this paragraph 13.6(b), or (B) any receipt, use
handling,  generation,   transportation,   storage,  treatment,  release  and/or
disposal of any  hazardous  substance  or waste or any  radioactive  material or
radiation on or about the Property as a proximate  result of Tenant's use of the
Property or as a result of any  intentional  or  negligent  acts or omissions of
Tenant or of any agent, employee or invitee of Tenant.

                           (ix)  Tenant  shall   cooperate   with   Landlord  in
furnishing  Landlord  with  complete  information  regarding  Tenant's  receipt,
handling, use, storage, transportation, generation, treatment and/or disposal of
any hazardous substances or wastes or radiation or radioactive  materials.  Upon
request,  Tenant shall grant Landlord  reasonable  access at reasonable times to
the   Property   to  inspect   Tenant's   receipt,   handling,   use,   storage,
transportation, generation, treatment and/or disposal of hazardous substances or
wastes or radiation or radioactive materials, without being deemed guilty of any
disturbance  of Tenant's use or possession and without being liable to Tenant in
any manner.

                           (x)  Notwithstanding  Landlord's rights of inspection
and review under this  paragraph  13.6(b),  Landlord shall have no obligation or
duty to so inspect or review,  and no third  party  shall be entitled to rely on
Landlord to conduct any sort of inspection or review by reason of the provisions
of this paragraph 13.6(b).


                                       35

<PAGE>


                           (xi)  If  Tenant  receives,  handles,  uses,  stores,
transports,  generates,  treats and/or  disposes of any hazardous  substances or
wastes or  radiation  or  radioactive  materials on or about the Property at any
time  during the term of this  Lease,  then  within  thirty  (30) days after the
termination  or  expiration  of this Lease,  Tenant at its sole cost and expense
shall  obtain and deliver to Landlord an  environmental  study,  performed by an
expert reasonably  satisfactory to Landlord,  evaluating the presence or absence
of hazardous substances and wastes,  radiation and radioactive  materials on and
about the Property.  Such study shall be based on a reasonable and prudent level
of tests and  investigations  of the  Property and  surrounding  portions of the
Center (if appropriate), which tests shall be conducted no earlier than the date
of termination or expiration of this Lease.  Liability for any remedial  actions
required  or  recommended  on the  basis of such  study  shall be  allocated  in
accordance  with Sections 13.4,  13.6, 14.6 and other  applicable  provisions of
this Lease.

                  (c) Landlord shall indemnify,  defend and hold Tenant harmless
from and against any and all claims, losses, damages, liabilities,  costs, legal
fees and  expenses of any sort arising out of or relating to (i) the presence on
the Property of any hazardous  substances or wastes or radiation or  radioactive
materials  as of the Rent  Commencement  Date  (other  than as a  result  of any
intentional or negligent  acts or omissions of Tenant or of any agent,  employee
or  invitee of  Tenant),  (ii) any  unauthorized  release  into the  environment
(including,  but not limited to, the  Property) of any  hazardous  substances or
wastes or radiation or radioactive  materials to the extent such release results
from the  negligence  of or willful  misconduct  or  omission by Landlord or its
agents or employees,  and/or (iii) the presence on the Property of any hazardous
substances  or wastes or radiation or  radioactive  materials  arising after the
Rent  Commencement  Date from any cause or source  other than as a result of any
intentional or negligent  acts or omissions of Tenant or of any agent,  employee
or invitee of Tenant.

                  (d) The  provisions  of this  Section  13.6 shall  survive the
termination of this Lease.


                           14. INSURANCE AND INDEMNITY

         14.1     Insurance.

                  (a) Tenant shall procure and maintain in full force and effect
at all times  during  the term of this  Lease,  at  Tenant's  cost and  expense,
commercial  general  liability  insurance  to protect  against  liability to the
public,  or to any invitee of Tenant or  Landlord,  arising out of or related to
the use of or  resulting  from any  accident  occurring  in,  upon or about  the
Property,  with limits of liability of not less than (i) [...*...] for injury to
or death of one  person,  (ii)  [...*...]  for  personal  injury or  death,  per
occurrence,  and (iii) [...*...] for property damage, or a combined single limit
of liability of not less than [...*...]. Such insurance shall


- --------------------------
*CONFIDENTIAL TREATMENT REQUESTED
                                       36

<PAGE>


name Landlord, its general partners, its Managing Agent and any lender holding a
deed of trust on the  Property  from time to time (as  designated  in writing by
Landlord to Tenant from time to time) as  additional  insureds  thereunder.  The
amount of such  insurance  shall not be  construed  to limit  any  liability  or
obligation of Tenant under this Lease. Tenant shall also procure and maintain in
full force and effect at all times  during the term of this  Lease,  at Tenant's
cost and expense, products/completed operations coverage on terms and in amounts
(A)  customary in Tenant's  industry for  companies  engaged in the marketing of
products on a scale  comparable  to that in which Tenant is engaged from time to
time and (B) mutually  satisfactory  to Landlord and Tenant in their  respective
reasonable discretion.

                  (b)  Landlord  shall  procure  and  maintain in full force and
effect  at all times  during  the term of this  Lease,  at  Landlord's  cost and
expense (but  reimbursable  as an Operating  Expense  under Section 9.2 hereof),
policies of property insurance providing  protection against "all risk of direct
physical  loss" (as defined by and detailed in the  Insurance  Service  Office's
Commercial  Property  Program  "Cause of  Loss--Special  Form  [CP1030]"  or its
equivalent) on the shell of the Initial  Building and on the improvements in the
Common  Areas  of  the  Center,  on a  full  replacement  cost  basis  (with  no
co-insurance or, if coverage without  co-insurance is not reasonably  available,
then on an  "agreed  amount"  basis).  Such  insurance  may  include  earthquake
coverage to the extent Landlord in its discretion elects to carry such coverage,
and shall  have such  commercially  reasonable  deductibles  and other  terms as
Landlord in its discretion determines to be appropriate.  Landlord shall have no
obligation to carry property damage insurance for any alterations,  additions or
improvements installed by Tenant in or about the Initial Building.

                  (c) Tenant shall procure and maintain in full force and effect
at all times  during  the term of this  Lease,  at  Tenant's  cost and  expense,
policies of property insurance providing  protection against "all risk of direct
physical  loss" (as defined by and detailed in the  Insurance  Service  Office's
Commercial  Property  Program  "Cause of  Loss--Special  Form  [CP1030]"  or its
equivalent) on the Tenant  Improvements  constructed  pursuant to the Workletter
and on all other  alterations,  additions and  improvements  installed by Tenant
from time to time in or about the Initial  Building,  on a full replacement cost
basis  (with  no  co-insurance  or,  if  coverage  without  co-insurance  is not
reasonably available, then on an "agreed amount" basis). Such insurance may have
such  commercially  reasonable  deductibles  and  other  terms as  Tenant in its
discretion determines to be appropriate, and shall name both Tenant and Landlord
as insureds as their interests may appear.

                  (d)  During  the course of  construction  of the  improvements
being  constructed  by  Landlord  and Tenant  under  Section  5.1 and Exhibit C,
Landlord and Tenant  respectively  shall each procure and maintain in full force
and effect, at its respective sole cost and expense,  policies of builder's risk
insurance on the  improvements  respectively  being  constructed  by it, in such
amounts and with such  commercially  reasonable  deductibles  and other terms as
Landlord in its  discretion  determines  to be  appropriate  with respect to the
insurance to be maintained by


                                       37

<PAGE>


Landlord, and in such amounts and with such commercially  reasonable deductibles
and other terms as Landlord and Tenant may mutually and reasonably  determine to
be appropriate with respect to the insurance to be maintained by Tenant.

         14.2  Quality Of Policies And  Certificates.  All policies of insurance
required to be maintained  by Tenant  hereunder  shall be issued by  responsible
insurers and shall be written as primary policies not contributing  with and not
in excess of any  coverage  that  Landlord may carry.  Tenant  shall  deliver to
Landlord  copies of policies or  certificates  of  insurance  showing  that said
policies are in effect. The coverage provided by such policies shall include the
clause or  endorsement  referred to in Section 14.4. If Tenant fails to acquire,
maintain  or renew any  insurance  required  to be  maintained  by it under this
Article 14 or to pay the premium  therefor,  and such failure  continues for ten
(10) days after written notice from Landlord to Tenant  specifying such failure,
then Landlord, at its option and in addition to its other remedies,  but without
obligation so to do, may procure such insurance,  and any sums expended by it to
procure  any such  insurance  shall be repaid  upon  demand,  with  interest  as
provided in Section 3.2 hereof.  Tenant shall obtain written  undertakings  from
each  insurer  under  policies  required  to be  maintained  by it to notify all
insureds thereunder at least thirty (30) days prior to cancellation of coverage.

         14.3  Workers'  Compensation.  Tenant shall  maintain in full force and
effect during the term of this Lease workers' compensation insurance in at least
the minimum amounts required by law, covering all of Tenant's  employees working
on the Property.

         14.4 Waiver Of Subrogation.  To the extent permitted by law and without
affecting  the  coverage  provided  by  insurance   required  to  be  maintained
hereunder, Landlord and Tenant each waive any right to recover against the other
with respect to (i) damage to property,  (ii) damage to the Property or any part
thereof, or (iii) claims arising by reason of any of the foregoing,  but only to
the extent  that any of the  foregoing  damages and claims  under  clauses (i) -
(iii) hereof are covered,  and only to the extent of such coverage,  by casualty
insurance  actually  carried  or  required  to be  carried  hereunder  by either
Landlord or Tenant.  This  provision  is intended  to waive  fully,  and for the
benefit of each party, any rights and claims which might give rise to a right of
subrogation  in any  insurance  carrier.  Each party  shall  procure a clause or
endorsement  on any casualty  insurance  policy denying to the insurer rights of
subrogation against the other party to the extent rights have been waived by the
insured  prior to the  occurrence  of  injury  or  loss.  Coverage  provided  by
insurance  maintained  by Tenant shall not be limited,  reduced or diminished by
virtue of the subrogation waiver herein contained.

         14.5  Increase  In  Premiums.  Tenant  shall  do all  acts  and pay all
expenses  necessary  to  insure  that the  Property  is not  used  for  purposes
prohibited  by any  applicable  fire  insurance,  and that  Tenant's  use of the
Property complies with all requirements  necessary to obtain any such insurance.
If Tenant uses or permits the  Property to be used in a manner  which  increases
the existing  rate of any  insurance  carried by Landlord on the Center and such
use continues for


                                       38

<PAGE>


longer than a reasonable period specified in any written notice from Landlord to
Tenant  identifying  the rate  increase and the factors  causing the same,  then
Tenant  shall pay the amount of the  increase  in premium  caused  thereby,  and
Landlord's costs of obtaining other replacement  insurance  policies,  including
any increase in premium, within ten (10) days after demand therefor by Landlord.

         14.6     Indemnification.

                  (a) Tenant shall  indemnify,  defend and hold Landlord and its
partners, shareholders,  officers, directors, agents and employees harmless from
any and all liability for injury to or death of any person, or loss of or damage
to the  property  of  any  person,  and  all  actions,  claims,  demands,  costs
(including, without limitation, reasonable attorneys' fees), damages or expenses
of any kind arising  therefrom which may be brought or made against  Landlord or
which Landlord may pay or incur by reason of the use, occupancy and enjoyment of
the  Property  by  Tenant or any  invitees,  sublessees,  licensees,  assignees,
employees,  agents or contractors of Tenant or holding under Tenant  (including,
but not limited to, any such matters  arising out of or in  connection  with any
early entry upon the Property by Tenant pursuant to Section 2.2 hereof) from any
cause  whatsoever  other than  negligence  or willful  misconduct or omission by
Landlord,  its agents or  employees.  Landlord and its  partners,  shareholders,
officers,  directors,  agents and employees  shall not be liable for, and Tenant
hereby waives all claims against such persons for,  damages to goods,  wares and
merchandise  in or upon the Property,  or for injuries to Tenant,  its agents or
third  persons in or upon the  Property,  from any cause  whatsoever  other than
negligence  or  willful  misconduct  or  omission  by  Landlord,  its  agents or
employees.  Tenant  shall give  prompt  notice to  Landlord  of any  casualty or
accident in, on or about the Property.

                  (b) Landlord shall  indemnify,  defend and hold Tenant and its
partners, shareholders,  officers, directors, agents and employees harmless from
any and all liability for injury to or death of any person, or loss of or damage
to the  property  of  any  person,  and  all  actions,  claims,  demands,  costs
(including, without limitation, reasonable attorneys' fees), damages or expenses
of any kind arising  therefrom  which may be brought or made  against  Tenant or
which Tenant may pay or incur,  to the extent such  liabilities or other matters
arise in, on or about the  Property  by  reason  of any  negligence  or  willful
misconduct or omission by Landlord, its agents or employees.

         14.7 Blanket Policy. Any policy required to be maintained hereunder may
be maintained  under a so-called  "blanket  policy"  insuring  other parties and
other  locations  so long as the amount of  insurance  required  to be  provided
hereunder is not thereby diminished.


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<PAGE>


                           15. SUBLEASE AND ASSIGNMENT

         15.1  Assignment  And  Sublease  Of  Property.  Except in the case of a
Permitted  Transfer,  Tenant  shall not have the  right or power to  assign  its
interest in this  Lease,  or make any  sublease  of the Initial  Building or any
portion thereof, nor shall any interest of Tenant under this Lease be assignable
involuntarily  or by operation of law,  without on each  occasion  obtaining the
prior  written  consent of Landlord,  which  consent  shall not be  unreasonably
withheld or delayed.  Any purported  sublease or assignment of Tenant's interest
in this Lease requiring but not having received  Landlord's  consent thereto (to
the extent such consent is required hereunder) shall be void. Except in the case
of a  Permitted  Transfer,  any  dissolution,  consolidation,  merger  or  other
reorganization  of Tenant,  or any sale or transfer of substantially  all of the
stock or  assets  of  Tenant  in a  single  transaction  or  series  of  related
transactions,  shall be deemed to be an  assignment  hereunder and shall be void
without the prior written consent of Landlord as required above. Notwithstanding
the  foregoing,  Tenant  shall have the right to assign this Lease or sublet the
Initial Building,  or any portion thereof,  without Landlord's consent (but with
prior or concurrent  written notice by Tenant to Landlord),  to any Affiliate of
Tenant,  or to any entity  which  results  from a merger or  consolidation  with
Tenant,  or to any entity which acquires  substantially all or substantially all
of the  stock or  assets  of  Tenant,  as a going  concern  (hereinafter  each a
"Permitted Transfer"). For purposes of the preceding sentence, an "Affiliate" of
Tenant  shall mean any  entity in which  Tenant  owns at least a twenty  percent
(20%) equity  interest,  any entity which owns at least a twenty  percent  (20%)
equity  interest  in Tenant,  and/or any entity  which is related to Tenant by a
chain of ownership  interests  involving at least a twenty  percent (20%) equity
interest at each level in the chain.  Landlord  shall have no right to terminate
this  Lease in  connection  with,  and shall  have no right to any sums or other
economic  consideration  resulting  from,  any  Permitted  Transfer.  Except  as
expressly set forth in this Section  15.1,  however,  the  provisions of Section
15.2 shall remain applicable to any Permitted  Transfer and the transferee under
such  Permitted  Transfer  shall be and  remain  subject to all of the terms and
provisions of this Lease.

         15.2     Rights Of Landlord.

                  (a)  Consent by Landlord  to one or more  assignments  of this
Lease,  or to one or more  sublettings  of the  Initial  Building or any portion
thereof, or collection of rent by Landlord from any assignee or sublessee, shall
not operate to exhaust  Landlord's  rights under this Article 15, nor constitute
consent to any subsequent  assignment or  subletting.  No assignment of Tenant's
interest in this Lease and no sublease shall relieve  Tenant of its  obligations
hereunder,  notwithstanding  any waiver or extension of time granted by Landlord
to any  assignee or  sublessee,  or the failure of Landlord to assert its rights
against any assignee or sublessee,  and regardless of whether Landlord's consent
thereto is given or required to be given hereunder. In the event of a default by
any assignee,  sublessee or other  successor of Tenant in the performance of any
of the terms or  obligations  of Tenant  under this Lease,  Landlord may proceed
directly against Tenant without the necessity of exhausting remedies against any
such


                                       40

<PAGE>


assignee,  sublessee or other  successor.  In addition,  Tenant  immediately and
irrevocably assigns to Landlord, as security for Tenant's obligations under this
Lease,  all rent from any subletting of all or any part of the Initial  Building
as  permitted  under this  Lease,  and  Landlord,  as Tenant's  assignee  and as
attorney-in-fact  for Tenant, or any receiver for Tenant appointed on Landlord's
application,  may  collect  such rent and apply it toward  Tenant's  obligations
under this Lease;  except  that,  until the  occurrence  of an act of default by
Tenant which continues beyond any applicable cure period,  Tenant shall have the
right to collect such rent.

                  (b) Upon any assignment of Tenant's interest in this Lease for
which Landlord's consent is required under Section 15.1 hereof, Tenant shall pay
to Landlord,  within ten (10) days after receipt  thereof by Tenant from time to
time, [...*...] of all cash sums and other economic  considerations  received by
Tenant  in  connection  with or as a  result  of such  assignment,  after  first
deducting  therefrom  (i) the  unamortized  cost of any  leasehold  improvements
previously made in the Initial  Building and paid for by Tenant,  (ii) any costs
incurred by Tenant for leasehold  improvements  (including,  but not limited to,
third-party  architectural  and space planning costs) in the Initial Building in
connection with such assignment,  and (iii) any real estate  commissions  and/or
attorneys' fees incurred by Tenant in connection with such  assignment.  Nothing
in this paragraph  15.2(b) shall entitle  Landlord to receive any portion of any
consideration  received by Tenant in  connection  with any sale of its  personal
property.

                  (c) Upon any  sublease  of all or any  portion of the  Initial
Building for which  Landlord's  consent is required  under  Section 15.1 hereof,
Tenant  shall pay to  Landlord,  within ten (10) days after  receipt  thereof by
Tenant  from  time to time,  [...*...]  of all  cash  sums  and  other  economic
considerations  received  by  Tenant in  connection  with or as a result of such
sublease,  after first deducting  therefrom (i) the rental due hereunder for the
corresponding period, prorated (on the basis of the average per-square-foot cost
paid by Tenant for the entire Initial  Building for the applicable  period under
this  Lease)  to  reflect  the  size of the  subleased  portion  of the  Initial
Building,  (ii) any costs incurred by Tenant for leasehold  improvements  in the
subleased  portion of the  Initial  Building  (including,  but not  limited  to,
third-party  architectural and space planning costs) for the specific benefit of
the sublessee in connection  with such sublease,  amortized over the term of the
sublease,  (iii) any real estate  commissions and/or attorneys' fees incurred by
Tenant  in  connection  with  such  sublease,  amortized  over  the term of such
sublease, and (iv) the unamortized cost of any leasehold improvements previously
made and paid for by Tenant with respect to the subleased portion of the Initial
Building.  Nothing in this paragraph  15.2(c) shall entitle  Landlord to receive
any portion of any consideration  received by Tenant in connection with any sale
of its personal property.


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*CONFIDENTIAL TREATMENT REQUESTED
                                       41

<PAGE>


                     16. RIGHT OF ENTRY AND QUIET ENJOYMENT

         16.1 Right Of Entry. Landlord and its authorized  representatives shall
have the right to enter the Initial Building at any time during the term of this
Lease during normal business hours and upon not less than twenty-four (24) hours
prior notice, except in the case of emergency (in which event no notice shall be
required and entry may be made at any time),  for the purpose of inspecting  and
determining  the  condition  of the  Initial  Building  or for any other  proper
purpose  including,  without  limitation,  to  make  repairs,   replacements  or
improvements which Landlord may deem necessary,  to show the Initial Building to
prospective purchasers, to show the Initial Building to prospective tenants (but
only during the final year of the term of this  Lease),  and to post  notices of
nonresponsibility.  Landlord shall not be liable for  inconvenience,  annoyance,
disturbance, loss of business, quiet enjoyment or other damage or loss to Tenant
by reason of making any repairs or performing any work upon the Initial Building
or  the  Property  or by  reason  of  erecting  or  maintaining  any  protective
barricades in connection with any such work, and the obligations of Tenant under
this Lease shall not thereby be  affected  in any manner  whatsoever,  provided,
however,  Landlord shall use reasonable efforts to minimize the inconvenience to
Tenant's normal business operations caused thereby.

         16.2 Quiet Enjoyment.  Landlord covenants that Tenant,  upon paying the
rent and performing its  obligations  hereunder and subject to all the terms and
conditions of this Lease,  shall peacefully and quietly have, hold and enjoy the
Initial  Building and the Property  throughout the term of this Lease,  or until
this Lease is terminated as provided by this Lease.


                             17. CASUALTY AND TAKING

         17.1     Damage or Destruction.

                  (a) If  the  Initial  Building,  or the  Common  Areas  of the
Property,  are damaged or destroyed in whole or in part under  circumstances  in
which (i) repair and  restoration  is permitted  under  applicable  governmental
laws,  regulations  and  building  codes  then in  effect  and (ii)  repair  and
restoration  reasonably can be completed within a period of one (1) year (or, in
the case of an occurrence during the last year of the term of this Lease, within
a period of sixty (60) days) following the date of the occurrence, then Landlord
shall  commence  and  complete,  with all due  diligence  and as  promptly as is
reasonably  practicable under the conditions then existing,  all such repair and
restoration  as may be required to return the Common  Areas of the  Property and
the  Improvements  previously  constructed  by  Landlord  under  Section 5.1 and
Exhibit C to the condition existing immediately prior to the occurrence.  In the
event of damage  or  destruction  the  repair  of which is not  permitted  under
applicable  governmental laws, regulations and building codes then in effect, if
such damage or destruction (despite being corrected to the extent then permitted
under applicable  governmental laws, regulations and building codes) would still
materially impair Tenant's ability to conduct its business in the Initial


                                       42

<PAGE>


Building,  then  either  party may  terminate  this  Lease as of the date of the
occurrence by giving  written  notice to the other within thirty (30) days after
the date of the occurrence; if neither party timely elects such termination,  or
if such damage or destruction  does not materially  impair  Tenant's  ability to
conduct its business in the Initial Building,  then this Lease shall continue in
full force and effect,  except that there shall be an  equitable  adjustment  in
monthly  minimum  rental  and of  Tenant's  Operating  Cost  Share of  Operating
Expenses,  based  upon the  extent to which  Tenant's  ability  to  conduct  its
business in the Initial  Building is impaired,  and Landlord  shall  restore the
Common Areas of the  Property and the  Improvements  previously  constructed  by
Landlord under Section 5.1 and Exhibit C to a complete  architectural  whole and
to a functional  condition.  In the event of damage or destruction  which cannot
reasonably  be repaired  within one (1) year (or,  in the case of an  occurrence
during  the last year of the term of this  Lease,  within a period of sixty (60)
days) following the date of the occurrence,  then either Landlord or Tenant,  at
its  election,  may  terminate  this Lease as of the date of the  occurrence  by
giving written notice to the other within thirty (30) days after the date of the
occurrence;  if neither  party timely elects such  termination,  then this Lease
shall  continue in full force and effect and  Landlord  shall repair and restore
the  Property  in  accordance  with,  and to the extent  provided  in, the first
sentence of this Section 17.1.

                  (b)  Landlord's  obligations  pursuant to Section  17.1(a) are
subject to the following limitations:

                           (i)  If  the  occurrence   results  from  an  insured
casualty,  Landlord's  rebuilding  obligation  shall not  exceed  the  amount of
insurance  proceeds  received  by  Landlord  from  insurers  by  reason  of such
occurrence, plus the amount of any applicable deductible (provided that Landlord
shall be  obligated to use its best  efforts to recover any  available  proceeds
from its then  existing  insurance),  and, if such  proceeds  are  insufficient,
either party may terminate the Lease unless the other party promptly  elects and
agrees, in writing, to contribute the amount of the shortfall; and

                           (ii) If the  occurrence  results  from  an  uninsured
casualty,  Landlord shall be required to repair and restore the Initial Building
and Common  Areas of the Property (as  contemplated  in Section  17.1(a)) to the
condition  existing  immediately  prior to the  occurrence of such casualty (but
only to the extent of the  improvements  previously  constructed or installed by
Landlord pursuant to this Lease),  provided that Landlord's obligation to repair
and  restore  shall not exceed an amount  equal to  [...*...]  of the  aggregate
replacement  cost  of the  Common  Area  improvements  on the  Property  and the
Improvements originally constructed by Landlord under Section 5.1 and Exhibit C;
if the replacement  cost as to Landlord  exceeds such amount,  then Landlord may
terminate this Lease unless Tenant  promptly elects and agrees,  in writing,  to
contribute the amount of the shortfall.


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*CONFIDENTIAL TREATMENT REQUESTED
                                       43

<PAGE>


                  (c) From and  after  the date of an  occurrence  resulting  in
damage to or destruction  of the Initial  Building or of the Common Areas of the
Property,  and continuing  until repair and  restoration  thereof are completed,
there  shall  be an  equitable  abatement  of  minimum  rental  and of  Tenant's
Operating  Cost  Share of  Operating  Expenses  based  upon the  degree to which
Tenant's ability to conduct its business in the Initial Building is impaired.

         17.2     Condemnation.

                  (a) If  during  the term of this  Lease  the  Property  or the
Improvements,  or any substantial part of either,  is taken by eminent domain or
by reason of any public improvement or condemnation proceeding, or in any manner
by exercise of the right of eminent domain  (including any transfer in avoidance
of an exercise of the power of eminent domain),  or receives  irreparable damage
by reason of anything  lawfully  done under color of public or other  authority,
then (i) this Lease shall  terminate  as to the entire  Property  at  Landlord's
election  by written  notice  given to Tenant  within  sixty (60) days after the
taking  has  occurred,  and (ii) this  Lease  shall  terminate  as to the entire
Property at Tenant's election, by written notice given to Landlord within thirty
(30)  days  after  the  nature  and  extent  of the  taking  have  been  finally
determined, if the portion of the Property taken is of such extent and nature as
substantially  to handicap,  impede or  permanently  impair  Tenant's use of the
balance of the Property.  If Tenant elects to terminate this Lease, Tenant shall
also notify Landlord of the date of termination, which date shall not be earlier
than thirty (30) days nor later than ninety (90) days after  Tenant has notified
Landlord  of  Tenant's  election  to  terminate,  except  that this Lease  shall
terminate  on the date of taking if such date falls on any date  before the date
of termination  designated by Tenant.  If neither party elects to terminate this
Lease as  hereinabove  provided,  this Lease  shall  continue  in full force and
effect (except that there shall be an equitable  abatement of minimum rental and
of Tenant's  Operating Cost Share of Operating Expenses based upon the degree to
which  Tenant's  ability to conduct  its  business  in the  Initial  Building is
impaired)  and Landlord  shall  restore the Common Areas of the Property and the
Improvements  originally constructed by Landlord under Section 5.1 and Exhibit C
to a complete  architectural  whole and a functional  condition and as nearly as
reasonably  possible to the condition  existing before the taking. In connection
with any such  restoration,  each party shall use its  respective  best  efforts
(including,  without limitation,  any necessary negotiation or intercession with
its  respective  lender,  if any) to ensure that any severance  damages or other
condemnation   awards  intended  to  provide   compensation  for  rebuilding  or
restoration costs are promptly collected and made available to Landlord, subject
only to such payment controls as either party's lender may reasonably require in
order to ensure the proper  application of such proceeds  toward the restoration
of the Improvements. Each party waives the provisions of Code of Civil Procedure
Section  1265.130,  allowing  either  party to petition  the  Superior  Court to
terminate this Lease in the event of a partial condemnation of the Property.

                  (b)  Notwithstanding any of the provisions of Section 17.2(a),
Landlord's  obligations to repair and restore  pursuant to Section 17.2(a) shall
not exceed, net of any


                                       44

<PAGE>


condemnation  awards  or other  proceeds  available  for and  allocable  to such
restoration as contemplated in Section 17.2(a),  an amount equal to [...*...] of
the aggregate  replacement cost of the Common Area  improvements on the Property
and of the Improvements originally constructed by Landlord under Section 5.1 and
Exhibit C; if the  replacement  cost as to Landlord  exceeds such  amount,  then
Landlord may terminate this Lease unless Tenant promptly  elects and agrees,  in
writing, to contribute the amount of the shortfall.

         17.3 Reservation Of Compensation.  Landlord reserves, and Tenant waives
and assigns to Landlord,  all rights to any award or compensation  for damage to
the Improvements, the Property and the leasehold estate created hereby, accruing
by reason of any  taking in any  public  improvement,  condemnation  or  eminent
domain  proceeding  or in any other  manner by  exercise of the right of eminent
domain or of  anything  lawfully  done by public  authority,  except that Tenant
shall be entitled to any and all  compensation or damages paid for or on account
of  Tenant's  moving  expenses,  trade  fixtures,  equipment  and any  leasehold
improvements on the Property installed by Tenant at its own expense, but only to
the  extent  Tenant  would  have  been  entitled  to  remove  such  items at the
expiration  of the term of this  Lease and then  only to the  extent of the then
remaining  unamortized  value of such  improvements  computed on a straight-line
basis over the term of this Lease.  Tenant  covenants  to deliver  such  further
assignments of the foregoing as Landlord may from time to time request.

         17.4  Restoration  Of  Improvements.  In connection  with any repair or
restoration of  Improvements  by either party  following a casualty or taking as
hereinabove  set forth,  the party  responsible  for such repair or  restoration
shall,  to  the  extent  possible,  return  such  Improvements  to  a  condition
substantially  equal to that which existed  immediately prior to the casualty or
taking.  To the extent such party wishes to make material  modifications to such
Improvements,  such modifications shall be subject to the prior written approval
of the other party (not to be unreasonably withheld or delayed),  except that no
such  approval  shall  be  required  for  modifications  that  are  required  by
applicable governmental authorities as a condition of the repair or restoration,
unless such required  modifications  would impair or impede Tenant's  conduct of
its business in the Initial  Building (in which case any such  modifications  in
Landlord's work shall require Tenant's  consent,  not  unreasonably  withheld or
delayed) or would materially and adversely affect the exterior  appearance,  the
structural integrity or the mechanical or other operating systems of the Initial
Building (in which case any such  modifications  in Tenant's  work shall require
Landlord's consent, not unreasonably withheld or delayed).


                                   18. DEFAULT

         18.1 Events Of Default.  The  occurrence of any of the following  shall
constitute an event of default on the part of Tenant:

                  (a) [Omitted.]


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<PAGE>


                  (b)  Nonpayment.  Failure to pay, when due, any amount payable
to Landlord hereunder, such failure continuing for a period of five (5) business
days after written  notice of such  failure;  provided,  however,  that any such
notice  shall be in lieu of, and not in addition to, any notice  required  under
California Code of Civil Procedure Section 1161 et seq., as amended from time to
time;

                  (c) Other  Obligations.  Failure  to perform  any  obligation,
agreement  or covenant  under this Lease other than those  matters  specified in
subsection  (b)  hereof,  such  failure  continuing  for thirty  (30) days after
written  notice of such  failure;  provided,  however,  that if such  failure is
curable in nature but cannot reasonably be cured within such 30-day period, then
Tenant shall not be in default if, and so long as,  Tenant  promptly (and in all
events within such 30-day period) commences such cure and thereafter  diligently
pursues such cure to completion;  and provided further,  however,  that any such
notice  shall be in lieu of, and not in addition to, any notice  required  under
California Code of Civil Procedure Section 1161 et seq., as amended from time to
time;

                  (d) General Assignment. A general assignment by Tenant for the
benefit of creditors;

                  (e)  Bankruptcy.  The  filing  of any  voluntary  petition  in
bankruptcy  by Tenant,  or the filing of an  involuntary  petition  by  Tenant's
creditors,  which  involuntary  petition  remains  undischarged  for a period of
thirty  (30)  days.  In the event  that  under  applicable  law the  trustee  in
bankruptcy  or Tenant has the right to affirm this Lease and continue to perform
the obligations of Tenant hereunder,  such trustee or Tenant shall, in such time
period as may be permitted by the bankruptcy court having jurisdiction, cure all
defaults of Tenant  hereunder  outstanding  as of the date of the  affirmance of
this Lease and provide to Landlord such adequate  assurances as may be necessary
to ensure Landlord of the continued  performance of Tenant's  obligations  under
this Lease. Specifically,  but without limiting the generality of the foregoing,
such adequate  assurances must include assurances that the Property continues to
be operated only for the use permitted  hereunder.  The provisions hereof are to
assure that the basic understandings between Landlord and Tenant with respect to
Tenant's  use of the  Property  and  the  benefits  to  Landlord  therefrom  are
preserved, consistent with the purpose and intent of applicable bankruptcy laws;

                  (f)  Receivership.  The employment of a receiver  appointed by
court order to take  possession of  substantially  all of Tenant's assets or the
Property,  if such receivership  remains undissolved for a period of thirty (30)
days;

                  (g) Attachment.  The  attachment,  execution or other judicial
seizure of all or substantially all of Tenant's assets or the Property,  if such
attachment or other seizure remains  undismissed or undischarged for a period of
thirty (30) days after the levy thereof; or


                                       46

<PAGE>


                  (h)  Insolvency.  The  admission  by Tenant in  writing of its
inability  to pay its  debts as they  become  due,  the  filing  by  Tenant of a
petition seeking any reorganization or arrangement,  composition,  readjustment,
liquidation,  dissolution or similar relief under any present or future statute,
law or regulation, the filing by Tenant of an answer admitting or failing timely
to contest a material  allegation of a petition filed against Tenant in any such
proceeding  or,  if  within  thirty  (30) days  after  the  commencement  of any
proceeding   against  Tenant   seeking  any   reorganization   or   arrangement,
composition, readjustment,  liquidation, dissolution or similar relief under any
present or future statute,  law or regulation,  such  proceeding  shall not have
been dismissed.

         18.2     Remedies Upon Tenant's Default.

                  (a) Upon the  occurrence of any event of default  described in
Section 18.1 hereof, Landlord, in addition to and without prejudice to any other
rights or remedies it may have,  shall have the immediate  right to re-enter the
Property or any part  thereof and  repossess  the same,  expelling  and removing
therefrom  all persons and  property  (which  property may be stored in a public
warehouse  or  elsewhere at the cost and risk of and for the account of Tenant),
using such force as may be necessary to do so (as to which Tenant  hereby waives
any claim for loss or damage that may thereby occur).  In addition to or in lieu
of such re-entry,  and without  prejudice to any other rights or remedies it may
have,  Landlord  shall  have the right  either (i) to  terminate  this Lease and
recover  from  Tenant all  damages  incurred by Landlord as a result of Tenant's
default, as hereinafter  provided,  or (ii) to continue this Lease in effect and
recover rent and other charges and amounts as they become due.

                  (b) Even if Tenant has breached  this Lease,  this Lease shall
continue in effect for so long as Landlord does not terminate  Tenant's right to
possession  under  subsection  (a) hereof and  Landlord  may  enforce all of its
rights and remedies under this Lease,  including the right to recover rent as it
becomes due, and Landlord,  without  terminating this Lease, may exercise all of
the rights and remedies of a lessor under  California  Civil Code Section 1951.4
(lessor may continue lease in effect after lessee's  breach and  abandonment and
recover rent as it becomes due, if lessee has right to sublet or assign, subject
only  to  reasonable  limitations),  or any  successor  Code  section.  Acts  of
maintenance, preservation or efforts to relet the Property or the appointment of
a receiver upon  application of Landlord to protect  Landlord's  interests under
this Lease shall not constitute a termination of Tenant's right to possession.

                  (c) If Landlord terminates this Lease pursuant to this Section
18.2,  Landlord shall have all of the rights and remedies of a landlord provided
by Section 1951.2 of the Civil Code of the State of California, or any successor
Code section, which remedies include Landlord's right to recover from Tenant (i)
the worth at the time of award of the unpaid rent and additional  rent which had
been earned at the time of  termination,  (ii) the worth at the time of award of
the amount by which the unpaid  rent and  additional  rent which would have been
earned  after  termination  until the time of award  exceeds  the amount of such
rental loss that


                                       47

<PAGE>


Tenant proves could have been reasonably avoided, (iii) the worth at the time of
award of the amount by which the unpaid rent and additional rent for the balance
of the term after the time of award  exceeds the amount of such rental loss that
Tenant proves could be reasonably  avoided,  and (iv) any other amount necessary
to  compensate  Landlord for all the  detriment  proximately  caused by Tenant's
failure to perform  its  obligations  under this Lease or which in the  ordinary
course of things would be likely to result therefrom, including, but not limited
to, the cost of recovering  possession  of the Property,  expenses of reletting,
including  necessary repair,  renovation and alteration of the Initial Building,
reasonable  attorneys' fees, and other reasonable  costs. The "worth at the time
of award" of the  amounts  referred  to in clauses  (i) and (ii) above  shall be
computed by allowing  interest at [...*...] per annum from the date such amounts
accrued to Landlord. The "worth at the time of award" of the amounts referred to
in clause (iii) above shall be computed by discounting  such amount at [...*...]
above the discount rate of the Federal Reserve Bank of San Francisco at the time
of award.

         18.3  Remedies  Cumulative.  All rights,  privileges  and  elections or
remedies  of  Landlord  contained  in this  Article  18 are  cumulative  and not
alternative  to the extent  permitted  by law and except as  otherwise  provided
herein.


                     19. SUBORDINATION, ATTORNMENT AND SALE

         19.1  Subordination  To Mortgage.  This Lease, and any sublease entered
into by  Tenant  under  the  provisions  of this  Lease,  shall be  subject  and
subordinate  to any  ground  lease,  mortgage,  deed  of  trust,  sale/leaseback
transaction or any other hypothecation for security now or hereafter placed upon
the Initial Building,  the Property,  the Center, or any of them, and the rights
of any  assignee  of  Landlord  or of any  ground  lessor,  mortgagee,  trustee,
beneficiary or leaseback  lessor under any of the foregoing,  and to any and all
advances  made  on the  security  thereof  and to all  renewals,  modifications,
consolidations,  replacements and extensions thereof;  provided,  however,  that
such  subordination  in the case of any future ground lease,  mortgage,  deed of
trust, sale/leaseback transaction or any other hypothecation for security placed
upon the Initial  Building,  the Property,  the Center,  or any of them shall be
conditioned  on Tenant's  receipt from the ground  lessor,  mortgagee,  trustee,
beneficiary  or  leaseback  lessor  of a  Non-Disturbance  Agreement  in a  form
reasonably  acceptable to Tenant (i) confirming that so long as Tenant is not in
material default  hereunder beyond any applicable cure period (for which purpose
the occurrence of any event of default under Section 18.1 hereof shall be deemed
to be  "material"),  Tenant's  rights  hereunder  shall not be disturbed by such
person or entity and (ii)  agreeing  that the  benefit  of such  Non-Disturbance
Agreement shall be transferable to any transferee under a Permitted Transfer and
to any other  assignee or subtenant  that is  acceptable  to the ground  lessor,
mortgagee,  trustee,  beneficiary  or leaseback  lessor at the time of transfer.
Moreover, Tenant's obligations under this Lease shall be conditioned on Tenant's
receipt within thirty (30) days after mutual  execution of this Lease,  from any
ground lessor, mortgagee,


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                                       48

<PAGE>


trustee,  beneficiary or leaseback lessor currently owning or holding a security
interest in the Property,  of a  Non-Disturbance  Agreement in a form reasonably
acceptable  to Tenant  confirming  (i) that so long as Tenant is not in material
default  hereunder  beyond any  applicable  cure period  (for which  purpose the
occurrence  of any event of default under Section 18.1 hereof shall be deemed to
be "material"),  Tenant's rights hereunder shall not be disturbed by such person
or entity and (ii) agreeing that the benefit of such  Non-Disturbance  Agreement
shall be  transferable to any transferee  under a Permitted  Transfer and to any
other assignee or subtenant that is acceptable to the ground lessor,  mortgagee,
trustee,  beneficiary  or  leaseback  lessor  at the  time of  transfer.  If any
mortgagee,  trustee,  beneficiary,   ground  lessor,  sale/leaseback  lessor  or
assignee elects to have this Lease be an encumbrance  upon the Property prior to
the lien of its  mortgage,  deed of trust,  ground lease or  leaseback  lease or
other security  arrangement and gives notice thereof to Tenant, this Lease shall
be deemed prior thereto,  whether this Lease is dated prior or subsequent to the
date thereof or the date of recording thereof. Tenant, and any sublessee,  shall
execute such documents as may reasonably be requested by any mortgagee, trustee,
beneficiary,  ground lessor,  sale/leaseback  lessor or assignee to evidence the
subordination herein set forth, subject to the conditions set forth above, or to
make this Lease prior to the lien of any mortgage,  deed of trust, ground lease,
leaseback  lease or other  security  arrangement,  as the case may be.  Upon any
default by Landlord in the  performance of its  obligations  under any mortgage,
deed of trust,  ground lease,  leaseback  lease or  assignment,  Tenant (and any
sublessee) shall,  notwithstanding  any subordination  hereunder,  attorn to the
mortgagee,  trustee,  beneficiary,  ground lessor,  leaseback lessor or assignee
thereunder  upon  demand and become the tenant of the  successor  in interest to
Landlord,  at the option of such  successor in interest,  and shall  execute and
deliver any instrument or instruments  confirming the attornment herein provided
for.

         19.2 Sale Of Landlord's Interest.  Upon sale, transfer or assignment of
Landlord's  entire interest in the Initial  Building and the Property,  Landlord
shall be relieved  of its  obligations  hereunder  with  respect to  liabilities
accruing from and after the date of such sale, transfer or assignment.

         19.3  Estoppel  Certificates.   Landlord  or  Tenant  (the  "responding
party"), as applicable, shall at any time and from time to time, within ten (10)
days after written request by the other party (the "requesting party"), execute,
acknowledge  and  deliver  to the  requesting  party a  certificate  in  writing
stating:  (i) that this Lease is unmodified and in full force and effect,  or if
there have been any  modifications,  that this Lease is in full force and effect
as modified and stating the date and the nature of each  modification;  (ii) the
date to which rental and all other sums payable  hereunder have been paid; (iii)
that the  requesting  party is not in default in the  performance  of any of its
obligations  under this Lease,  that the responding party has given no notice of
default to the requesting  party and that no event has occurred  which,  but for
the  expiration  of the  applicable  time period,  would  constitute an event of
default  hereunder,  or if the  requesting  party alleges that any such default,
notice or event has occurred, specifying the same in reasonable detail; and (iv)
such other matters as may reasonably be requested by the


                                       49

<PAGE>


requesting party or any institutional lender, mortgagee,  trustee,  beneficiary,
ground lessor,  sale/leaseback lessor, prospective purchaser of the Property, or
prospective  sublessee or assignee of this Lease. Any such certificate  provided
under this  Section 19.3 may be relied upon by any lender,  mortgagee,  trustee,
beneficiary,  assignee or  successor  in interest to Landlord or Tenant,  by any
prospective  purchaser,  by any purchaser on foreclosure or sale, by any grantee
under a deed in lieu of  foreclosure  of any  mortgage  or deed of  trust on the
Property,  by any subtenant or assignee, or by any other third party. Failure to
execute and return within the required time any estoppel  certificate  requested
hereunder,  if such failure  continues for five (5) days after a second  written
request by the requesting party for such estoppel  certificate,  shall be deemed
to be an  admission  of the  truth  of the  matters  set  forth  in the  form of
certificate submitted by the requesting party for execution.

         19.4  Subordination  to CC&R's.  This  Lease,  any  permitted  sublease
entered into by Tenant under the provisions of this Lease,  and the interests in
real property  conveyed  hereby and thereby shall be subject and subordinate (a)
to any  declarations  of covenants,  conditions and  restrictions  affecting the
Property  or the  Center  from  time to time,  provided  that the  terms of such
declarations  are  reasonable,  do not  materially  impair  Tenant's  ability to
conduct the uses permitted  hereunder on the Property,  and do not  discriminate
against Tenant relative to other similarly  situated tenants occupying  portions
of the Center, (b) to the Declaration of Covenants,  Conditions and Restrictions
for Pointe Grand  Business Park dated  November 4, 1991 and recorded on February
25, 1992 as Instrument No. 92025214,  Official  Records of San Mateo County,  as
amended from time to time (the "Master  Declaration"),  the  provisions of which
Master Declaration are an integral part of this Lease, (c) to the Declaration of
Covenants,  Conditions and Restrictions  dated November 23, 1987 and recorded on
November 24, 1987 as  Instrument  No.  87177987,  Official  Records of San Mateo
County, which declaration imposes certain covenants, conditions and restrictions
on the Property,  and (d) to the Environmental  Restriction and Covenant (Pointe
Grand) dated as of April 16, 1997 and  recorded on April 16, 1997 as  Instrument
No. 97-043682,  Official Records of San Mateo County,  which declaration imposes
certain covenants,  conditions and restrictions on the Center.  Tenant agrees to
execute,  upon request by Landlord,  any documents reasonably required from time
to time to evidence such subordination.

         19.5 Mortgagee  Protection.  If,  following a default by Landlord under
any mortgage,  deed of trust,  ground lease,  leaseback  lease or other security
arrangement covering the Initial Building,  the Property,  the Center, or any of
them, the Initial Building,  the Property and/or the Center,  as applicable,  is
acquired by the mortgagee, beneficiary, master lessor or other secured party, or
by any  other  successor  owner,  pursuant  to a  foreclosure,  trustee's  sale,
sheriff's sale,  lease  termination or other similar  procedure (or deed in lieu
thereof),  then any such person or entity so acquiring the Initial Building, the
Property and/or the Center shall not be:

                  (a)  liable for any act or  omission  of a prior  landlord  or
owner of the Property (including, but not limited to, Landlord);


                                       50

<PAGE>


                  (b) subject to any  offsets or  defenses  that Tenant may have
against  any  prior  landlord  or  owner  of  the  Property  and/or  the  Center
(including, but not limited to, Landlord);

                  (c) bound by any rent or additional  rent that Tenant may have
paid in advance to any prior landlord or owner of the Property and/or the Center
(including,  but not limited to,  Landlord) for a period in excess of one month,
or by any security deposit, cleaning deposit or other prepaid charge that Tenant
may have paid in  advance to any prior  landlord  or owner  (including,  but not
limited to,  Landlord),  except to the extent such deposit or prepaid amount has
been expressly  turned over to or credited to the successor owner thus acquiring
the Property and/or the Center, as applicable;

                  (d) liable for any warranties or representations of any nature
whatsoever,  whether pursuant to this Lease or otherwise,  by any prior landlord
or owner of the  Property  and/or the Center  (including,  but not  limited  to,
Landlord) with respect to the use, construction,  zoning,  compliance with laws,
title,  habitability,  fitness for purpose or possession,  or physical condition
(including,  without  limitation,  environmental  matters) of the Property,  the
Initial Building or the Center; or

                  (e) liable to Tenant in any amount beyond the interest of such
mortgagee,  beneficiary, master lessor or other secured party or successor owner
in the  Property  and the Center as they  exist from time to time,  it being the
intent of this  provision  that Tenant  shall look solely to the interest of any
such mortgagee,  beneficiary,  master lessor or other secured party or successor
owner in the Property and Center for the payment and discharge of the landlord's
obligations under this Lease and that such mortgagee, beneficiary, master lessor
or other  secured  party or  successor  owner  shall have no  separate  personal
liability for any such obligations.


                                  20. SECURITY

         20.1 Deposit.  Within  thirty (30) days after mutual  execution of this
Lease,  Tenant shall deposit with  Landlord the sum of [...*...]  which sum (the
"Security  Deposit")  shall be held by  Landlord as  security  for the  faithful
performance of all of the terms,  covenants,  and conditions of this Lease to be
kept and  performed by Tenant  during the term hereof.  If Tenant  defaults with
respect to any  provision  of this Lease,  including,  without  limitation,  the
provisions  relating  to the  payment of rental  and other  sums due  hereunder,
Landlord  shall  have the right,  but shall not be  required,  to use,  apply or
retain all or any part of the Security  Deposit for the payment of rental or any
other amount which Landlord may spend or become  obligated to spend by reason of
Tenant's  default or to  compensate  Landlord for any other loss or damage which
Landlord  may  suffer by reason  of  Tenant's  default.  If any  portion  of the
Security Deposit is so used or applied, Tenant shall, within ten (10) days after
written demand therefor,  deposit cash with Landlord in an amount  sufficient to
restore the Security Deposit to its original amount and


- ---------------------------
*CONFIDENTIAL TREATMENT REQUESTED
                                       51

<PAGE>



Tenant's  failure to do so shall be a material  breach of this  Lease.  Landlord
shall not be required  to keep any  deposit  under this  Section  separate  from
Landlord's  general funds, and Tenant shall not be entitled to interest thereon.
If Tenant  fully and  faithfully  performs  every  provision of this Lease to be
performed by it, the Security Deposit, or any balance thereof, shall be returned
to Tenant or, at Landlord's  option,  to the last assignee of Tenant's  interest
hereunder,  at the  expiration  of the term of this  Lease and after  Tenant has
vacated the Property. In the event of termination of Landlord's interest in this
Lease,  Landlord  shall  transfer all deposits then held by Landlord  under this
Section to Landlord's successor in interest,  whereupon Tenant agrees to release
Landlord  from all  liability  for the return of such deposit or the  accounting
thereof.


                                21. MISCELLANEOUS

         21.1 Notices. All notices,  consents,  waivers and other communications
which this Lease  requires or permits either party to give to the other shall be
in  writing  and shall be deemed  given  when  delivered  personally  (including
delivery by private courier or express delivery  service) or four (4) days after
deposit in the  United  States  mail,  registered  or  certified  mail,  postage
prepaid, addressed to the parties at their respective addresses as follows:

         To Tenant:                 (until Rent Commencement Date)
                                    SUGEN, Inc.
                                    351 Galveston Drive
                                    Redwood City, CA  94603-4720
                                    Attn:  Vice President, Finance

                                    (after Rent Commencement Date)
                                    SUGEN, Inc.
                                    _____ East Grand Avenue [to be determined]
                                    South San Francisco, CA 94080
                                    Attn: Vice President, Finance

         with copy to:              Cooley Godward LLP
                                    5 Palo Alto Square
                                    Palo Alto, CA  94306-2155
                                    Attn:  Anna B. Pope, Esq.

         To Landlord:               Britannia Pointe Grand Limited Partnership
                                    1939 Harrison Street, Suite 412
                                    Park Plaza Building
                                    Oakland, CA  94612
                                    Attn: T. J. Bristow


                                       52

<PAGE>


         with copy to:              Folger Levin & Kahn LLP
                                    Embarcadero Center West
                                    275 Battery Street, 23rd Floor
                                    San Francisco, CA 94111
                                    Attn: Donald E. Kelley, Jr.

or to such other  address as may be contained in a notice at least  fifteen (15)
days prior to the address  change from either party to the other given  pursuant
to this  Section.  Rental  payments and other sums  required by this Lease to be
paid by Tenant shall be delivered to Landlord at Landlord's  address provided in
this Section, or to such other address as Landlord may from time to time specify
in writing to Tenant, and shall be deemed to be paid only upon actual receipt.

         21.2  Successors And Assigns.  The  obligations of this Lease shall run
with the land,  and this Lease shall be binding upon and inure to the benefit of
the parties hereto and their respective successors and assigns,  except that the
original  Landlord  named herein and each  successive  Landlord under this Lease
shall be liable only for obligations accruing during the period of its ownership
of the Property,  said liability  terminating upon termination of such ownership
and passing to the successor lessor.

         21.3 No Waiver.  The failure of Landlord to seek redress for violation,
or to insist upon the strict  performance,  of any covenant or condition of this
Lease shall not be deemed a waiver of such  violation,  or prevent a  subsequent
act which would  originally  have  constituted  a violation  from having all the
force and effect of an original violation.

         21.4  Severability.  If any provision of this Lease or the  application
thereof is held to be invalid or  unenforceable,  the remainder of this Lease or
the application of such provision to persons or  circumstances  other than those
as to which it is invalid or unenforceable  shall not be affected  thereby,  and
each of the  provisions  of this Lease  shall be valid and  enforceable,  unless
enforcement of this Lease as so  invalidated  would be  unreasonable  or grossly
inequitable  under  all the  circumstances  or would  materially  frustrate  the
purposes of this Lease.

         21.5  Litigation  Between  Parties.  In the event of any  litigation or
other dispute resolution  proceedings  between the parties hereto arising out of
or in connection with this Lease,  the prevailing  party shall be reimbursed for
all reasonable costs,  including,  but not limited to,  reasonable  accountants'
fees  and  attorneys'  fees,   incurred  in  connection  with  such  proceedings
(including,  but not limited to, any appellate  proceedings relating thereto) or
in connection  with the  enforcement  of any judgment or award  rendered in such
proceedings.  "Prevailing  party"  within  the  meaning  of this  Section  shall
include,  without  limitation,  a party who  dismisses  an action  for  recovery
hereunder  in exchange for payment of the sums  allegedly  due,  performance  of
covenants allegedly breached or consideration  substantially equal to the relief
sought in the action.


                                       53

<PAGE>


         21.6 Surrender. A voluntary or other surrender of this Lease by Tenant,
or a mutual termination thereof between Landlord and Tenant, shall not result in
a merger but shall,  at the option of Landlord,  operate either as an assignment
to Landlord of any and all existing subleases and subtenancies, or a termination
of all or any existing  subleases  and  subtenancies.  This  provision  shall be
contained in any and all assignments or subleases made pursuant to this Lease.

         21.7 Interpretation. The provisions of this Lease shall be construed as
a whole,  according  to their  common  meaning,  and not strictly for or against
Landlord  or  Tenant.  The  captions  preceding  the  text of each  Section  and
subsection  hereof are included only for  convenience  of reference and shall be
disregarded in the construction or interpretation of this Lease.

         21.8 Entire Agreement.  This written Lease,  together with the exhibits
hereto,  contains all the representations and the entire  understanding  between
the  parties  hereto  with  respect  to the  subject  matter  hereof.  Any prior
correspondence,  memoranda or agreements are replaced in total by this Lease and
the exhibits hereto.  This Lease may be modified only by an agreement in writing
signed by each of the parties.

         21.9  Governing  Law.  This  Lease  and all  exhibits  hereto  shall be
construed  and  interpreted  in  accordance  with  and be  governed  by all  the
provisions of the laws of the State of California.

         21.10 No Partnership.  The relationship  between Landlord and Tenant is
solely that of a lessor and  lessee.  Nothing  contained  in this Lease shall be
construed as creating any type or manner of partnership,  joint venture or joint
enterprise with or between Landlord and Tenant.

         21.11  Financial  Information.  From time to time Tenant shall promptly
provide  directly to prospective  lenders and purchasers of the Property  and/or
Center  designated  by Landlord  such  financial  information  pertaining to the
financial status of Tenant as Landlord may reasonably request;  provided, Tenant
shall be  permitted  to provide  such  financial  information  in a manner which
Tenant  deems  reasonably  necessary  to  protect  the  confidentiality  of such
information,  including (if Tenant so requests) conditioning  disclosure of such
information upon execution of a reasonable confidentiality agreement by Landlord
and by any  other  proposed  or  permitted  recipient  of such  information.  In
addition,  from time to time,  Tenant shall provide Landlord with such financial
information  pertaining  to the  financial  status  of Tenant  as  Landlord  may
reasonably request.  Landlord agrees that all financial  information supplied to
Landlord by Tenant shall be treated as confidential  material,  and shall not be
disseminated  to any party or  entity  (including  any  entity  affiliated  with
Landlord) without Tenant's prior written consent,  except that Landlord shall be
entitled to provide  such  information,  subject to  reasonable  precautions  to
protect  the  confidential  nature  thereof,  (i)  to  Landlord's  partners  and
professional advisors, solely to use in connection with Landlord's execution and
enforcement of this Lease, and (ii) to prospective  lenders and/or purchasers of
the Property and/or Center, solely for use


                                       54

<PAGE>


in  connection  with their bona fide  consideration  of a proposed  financing or
purchase of the Property and/or Center,  provided that such prospective  lenders
and/or purchasers are not then engaged in businesses  directly  competitive with
the  business  then being  conducted by Tenant.  For  purposes of this  Section,
without limiting the generality of the obligations  provided herein, it shall be
deemed reasonable for Landlord to request copies of Tenant's most recent audited
annual financial  statements,  or, if audited statements have not been prepared,
unaudited financial statements for Tenant's most recent fiscal year, accompanied
by a  certificate  of  Tenant's  chief  financial  officer  that such  financial
statements  fairly  present  Tenant's  financial  condition  as of  the  date(s)
indicated.  Notwithstanding  any other provisions of this Section 21.11,  during
any period in which Tenant has outstanding a class of publicly traded securities
and is filing with the Securities and Exchange  Commission,  on a regular basis,
Forms 10Q and 10K and any other periodic  filings  required under the Securities
Exchange Act of 1934,  as amended,  it shall  constitute  sufficient  compliance
under this  Section  21.11 for Tenant to furnish  Landlord  with  copies of such
periodic  filings  substantially  concurrently  with the filing thereof with the
Securities and Exchange Commission.

                  Landlord and Tenant  recognize  the need of Tenant to maintain
the  confidentiality of information  regarding its financial status and the need
of  Landlord  to be  informed  of,  and to provide to  prospective  lenders  and
purchasers of the Property and/or Center  financial  information  pertaining to,
Tenant's  financial  status.  Landlord and Tenant  agree to cooperate  with each
other in achieving  these needs within the context of the  obligations set forth
in this Section.

         21.12  Costs.  If Tenant  requests  the consent of  Landlord  under any
provision  of this  Lease  for any act that  Tenant  proposes  to do  hereunder,
including, without limitation,  assignment or subletting of the Property, Tenant
shall,  as a condition  to doing any such act and the  receipt of such  consent,
reimburse  Landlord  promptly  for any and all  reasonable  costs  and  expenses
incurred by Landlord in connection  therewith,  including,  without  limitation,
reasonable attorneys' fees.

         21.13 Time. Time is of the essence of this Lease, and of every term and
condition hereof.

         21.14 Rules And  Regulations.  Tenant  shall  observe,  comply with and
obey,  and shall  cause  its  employees,  agents  and,  to the best of  Tenant's
ability, invitees to observe, comply with and obey such rules and regulations as
Landlord may  promulgate  from time to time for the safety,  care,  cleanliness,
order and use of the Improvements, the Property and the Center.

         21.15  Brokers.  Landlord  agrees  to  pay a  brokerage  commission  to
Catalyst Real Estate Group and to Cornish & Carey  Commercial in connection with
the consummation of this Lease in accordance with a separate  agreement.  Tenant
and Landlord each  represents and warrants that no other broker  participated in
the consummation of this Lease and agrees to indemnify,


                                       55

<PAGE>


defend and hold the other party harmless against any liability, cost or expense,
including,  without limitation,  reasonable  attorneys' fees, arising out of any
claims for brokerage  commissions  or other similar  compensation  in connection
with any conversations, prior negotiations or other dealings by the indemnifying
party with any other broker.

         21.16  Memorandum Of Lease.  At any time during the term of this Lease,
either party,  at its sole expense,  shall be entitled to record a memorandum of
this Lease and, if either party so elects,  both  parties  agree to cooperate in
the preparation, execution,  acknowledgement and recordation of such document in
reasonable form.

         21.17 Corporate  Authority.  The person signing this Lease on behalf of
Tenant warrants that he or she is fully authorized to do so and, by so doing, to
bind Tenant.  As evidence of such  authority,  Tenant shall deliver to Landlord,
upon or prior to execution of this Lease,  a certified  copy of a resolution  of
Tenant's board of directors  authorizing  the execution of this Lease and naming
the officer that is authorized to execute this Lease on behalf of Tenant.

         21.18 Execution and Delivery. This Lease may be executed in one or more
counterparts  and by separate  parties on separate  counterparts,  but each such
counterpart  shall  constitute  an original and all such  counterparts  together
shall constitute one and the same instrument.

         21.19  Survival.  Without  limiting  survival  provisions  which  would
otherwise be implied or  construed  under  applicable  law,  the  provisions  of
Sections 2.6, 9.4, 11.2,  11.3,  11.4,  13.6, 14.6 and 21.5 hereof shall survive
the  termination  of this Lease with respect to matters  occurring  prior to the
expiration of this Lease.


                  IN WITNESS  WHEREOF,  the parties  hereto have  executed  this
Lease as of the day and year first set forth above.


                  "Landlord"

BRITANNIA POINTE GRAND LIMITED
PARTNERSHIP, a Delaware limited
partnership

By:      BRITANNIA POINTE GRAND,
         LLC, a California limited liability
         company, General Partner


By:      /s/ T.J. Bristow
         ------------------------------------
         T. J. Bristow
         Its Manager


                                       56

<PAGE>

                  "Tenant"

SUGEN, INC., a Delaware corporation


By:      /s/ Stephen Evans-Freke
         ----------------------------------
         Stephen Evans-Freke
         Its Chairman and Chief Executive
            Officer



                                       57

<PAGE>



                                    EXHIBITS
                                    --------

            EXHIBIT A        Real Property Descriptions (Property and Center)

            EXHIBIT B        Site Plan

            EXHIBIT C        Workletter

            EXHIBIT D        Estimated Construction Schedule

            EXHIBIT E        Acknowledgement of Rent Commencement Date



<PAGE>


                                    EXHIBIT A


                           REAL PROPERTY DESCRIPTIONS


The Property

All that certain real property in the City of South San Francisco, County of San
Mateo, State of California, more particularly described as follows:

Lot 1 as shown on Parcel Map No. 91-284,  "Being a resubdivision  of the parcels
described in the deeds to Metal and Thermit  Corporation,  recorded in Book 293,
at Page 394 of Deeds; in Book 49, at Page 490, Official Records;  in Book 77, at
Page 415, Official  Records;  and, except that parcel described in Book 1352, at
Page 373,  Official  Records,"  filed on February 25, 1992, in Book 65 of Parcel
Maps, in the Office of the Recorder of the County of San Mateo, California.


The Center

All that certain real property in the City of South San Francisco, County of San
Mateo, State of California, more particularly described as follows:

Lots 1, 2, 3 and 4,  inclusive,  as shown on  Parcel  Map No.  91-284,  "Being a
resubdivision  of the  parcels  described  in the  deeds  to Metal  and  Thermit
Corporation,  recorded  in Book 293,  at Page 394 of Deeds;  in Book 49, at Page
490,  Official Records;  in Book 77, at Page 415, Official Records;  and, except
that parcel  described in Book 1352, at Page 373,  Official  Records,"  filed on
February 25, 1992,  in Book 65 of Parcel Maps,  in the Office of the Recorder of
the County of San Mateo, California.



                                       59

<PAGE>


                                    EXHIBIT C


                                   WORKLETTER


         This Workletter  ("Workletter")  constitutes part of the  Build-to-Suit
Lease dated as of June 11, 1997 (the  "Lease")  between  BRITANNIA  POINTE GRAND
LIMITED  PARTNERSHIP,  a Delaware limited partnership  ("Landlord"),  and SUGEN,
INC.,  a  Delaware  corporation  ("Tenant").  The terms of this  Workletter  are
incorporated in the Lease for all purposes.

1. Defined Terms. As used in this Workletter,  the following  capitalized  terms
have the following meanings:

         (a) Approved Plans: Plans and specifications prepared by the applicable
Architect  for the  respective  Improvements  and approved by both  Landlord and
Tenant in accordance  with  Paragraph 2 of this  Workletter  (subject to further
modification in accordance with such Paragraph 2).

         (b) Architect:  Chamorro Design Group, or any other architect  selected
by Landlord in its sole discretion, with respect to the Building Shell, the Site
Improvements and any other  Improvements which Landlord is to design pursuant to
this Workletter;  any architect  selected by Tenant with the written approval of
Landlord (which approval shall not be  unreasonably  withheld or delayed),  with
respect to the Tenant Improvements and any other Improvements which Tenant is to
design pursuant to this Workletter.

         (c) Building Shell:  The shell of the Initial  Building,  as more fully
defined on Schedule C-1 attached to this Workletter.

         (d) Change Order: See definition in Paragraph 2(e)(ii) hereof.

         (e) Cost of Improvement: See definition in Paragraph 2(c) hereof.

         (f) Final  Completion  Certificate:  See  definition in Paragraph  3(b)
hereof.

         (g) Final Working Drawings: See definition in Paragraph 2(a) hereof.

         (h) General Contractor:  Concrete Shell Structures,  Inc., or any other
general contractor selected by Landlord in its sole discretion,  with respect to
Landlord's  Work. The General  Contractor with respect to Tenant's Work shall be
selected by Tenant, subject to


                                       60

<PAGE>


Landlord's   approval  (not  to  be  unreasonably   withheld  or  delayed),   as
contemplated in Paragraph 5(a) hereof.

         (i)  Improvements:  The  Building  Shell,  Site  Improvements,   Tenant
Improvements  and other  improvements  shown on the Approved  Plans from time to
time and to be  constructed  on the  Property  pursuant  to the  Lease  and this
Workletter.

         (j)  Landlord  Delay:  Any of  the  following  types  of  delay  in the
completion of construction of the Tenant Improvements:

                  (i) Any delay resulting from Landlord's failure to furnish, in
a timely manner,  information requested by Tenant or by the Architect or General
Contractor for Tenant's Work in connection  with the design or  construction  of
Tenant's  Work,  or from  Landlord's  failure to approve in a timely  manner any
matters requiring approval by Landlord; or

                  (ii) Any delay of any other kind or nature  caused by Landlord
(or  Landlord's  contractors,   agents  or  employees)  or  resulting  from  the
performance of Landlord's Work.

         (k) Landlord's Work: The Building Shell and Site Improvements,  and any
other  Improvements  which Landlord is to construct or install  pursuant to this
Workletter or by mutual agreement of Landlord and Tenant from time to time.

         (l) Punch List Work:  Minor  corrections of  construction or decoration
details, and minor mechanical  adjustments,  that are required in order to cause
any  applicable  portion of the  Improvements  as  constructed to conform to the
Approved  Plans in all material  respects and that do not  materially  interfere
with Tenant's use or occupancy of the Initial Building and the Property.

         (m) Site Improvements:  The parking areas,  driveways,  landscaping and
other  improvements  to the Common  Areas of the  Property  that are depicted on
Exhibit B to the Lease (as the same may be  modified  pursuant to the process of
development and approval of the Approved Plans).

         (n) Structural Completion Certificate: See definition in Paragraph 3(a)
hereof.

         (o) Tenant Delay: Any of the following types of delay in the completion
of construction of the Building Shell:

                  (i) Any delay resulting from Tenant's failure to furnish, in a
timely manner,  information requested by Landlord or by the Architect or General
Contractor for Landlord's  Work in connection with the design or construction of
the Building Shell,  or from Tenant's  failure to approve in a timely manner any
matters requiring approval by Tenant;


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<PAGE>


                  (ii)  Any  delay  attributable  to any need to  construct  the
Building Shell in an "above standard" manner;

                  (iii) Any delay  resulting from Change  Orders,  including any
delay  resulting  from  the  need to  revise  any  drawings  or  obtain  further
governmental approvals as a result of any Change Order; or

                  (iv) Any  delay of any other  kind or nature  caused by Tenant
(or Tenant's contractors, agents or employees) or resulting from the performance
of Tenant's Work.

         (p) Tenant  Improvements:  The  improvements  to or within the  Initial
Building, other than improvements constituting part of the Building Shell, shown
on the Approved  Plans from time to time and to be constructed by Tenant (except
as  otherwise  provided  herein)  pursuant  to the  Lease  and this  Workletter,
including (but not limited to) the improvements  listed on Schedule C-2 attached
to this Workletter.

         (q)  Tenant's   Work:  All  of  the   Improvements   other  than  those
constituting  Landlord's  Work,  and such other  materials and  improvements  as
Tenant deems  necessary  or  appropriate  for Tenant's use and  occupancy of the
Initial Building.

         (r)  Unavoidable  Delays:  Delays  due to acts of God,  acts of  public
agencies,  labor disputes,  strikes,  fires, freight embargoes,  rainy or stormy
weather,  inability to obtain supplies,  materials,  fuels or permits, delays of
contractors  or  subcontractors,  or other  causes or  contingencies  beyond the
reasonable control of Landlord or Tenant, as applicable.

         (s) Work Deadlines:  The target dates for performance by the applicable
party of the steps listed in the  Estimated  Construction  Schedule  attached as
Exhibit D to the Lease.

         (t) Capitalized  terms not otherwise  defined in this Workletter  shall
have the definitions set forth in the Lease.

2. Plans,  Cost of  Improvements  and  Construction.  Landlord  and Tenant shall
comply  with  the  procedures  set  forth  in  this  Paragraph  2 in  preparing,
delivering and approving matters relating to the Improvements.

         (a) Approved Plans and Working Drawings for Landlord's  Work.  Landlord
shall  promptly and diligently  (and in all events prior to any applicable  Work
Deadlines, subject to Tenant Delays and Unavoidable Delays) cause to be prepared
and  delivered  to  Tenant,  for  approval,  plans  and  specifications  for the
Improvements  constituting  Landlord's  Work.  Following mutual approval of such
plans and specifications, Landlord shall then cause to be prepared and delivered
to Tenant,  on or before the applicable Work Deadline  (assuming timely delivery
by Tenant of all information, decisions and drawings required to be furnished or
made


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<PAGE>


by Tenant in order to permit complete preparation of plans and drawings),  final
working drawings and specifications for the Improvements constituting Landlord's
Work,  including  structural,  fire  protection,  life  safety,  mechanical  and
electrical  working  drawings and final  architectural  drawings  (collectively,
"Landlord's  Final Working  Drawings").  Landlord's Final Working Drawings shall
substantially  conform to the Approved Plans.  Landlord's  obligation to deliver
Landlord's  Final  Working  Drawings to Tenant  within the time period set forth
above shall be extended for any delay  encountered  by Landlord as a result of a
request by Tenant for changes in accordance  with the procedure set forth below,
any other Tenant Delays, or any Unavoidable Delays. No later than the applicable
Work  Deadline  (assuming  timely  delivery of plans and drawings by  Landlord),
Tenant shall either approve  Landlord's  Final Working  Drawings or set forth in
writing  with  particularity  any changes  necessary to bring  Landlord's  Final
Working Drawings into  substantial  conformity with the Approved Plans or into a
form which will be acceptable to Tenant. In no event, however, shall Tenant have
the right to object to any aspect of the proposed  plans and  specifications  or
proposed  Landlord's Final Working Drawings for Landlord's Work (including,  but
not limited  to, any change from the  Approved  Plans) that is  necessitated  by
applicable  law, or to any aspect of such proposed plans and  specifications  or
proposed Landlord's Final Working Drawings that relates to the Building Shell or
Site  Improvements,  although Landlord agrees to consult with Tenant and to give
reasonable consideration to Tenant's views regarding functional  characteristics
of the  Building  Shell and Site  Improvements.  Failure of Tenant to deliver to
Landlord written notice of disapproval and  specification of required changes on
or before the  applicable  Work Deadline  shall  constitute  and be deemed to be
approval of Landlord's Final Working Drawings. Upon approval,  actual or deemed,
of Landlord's  Final Working  Drawings by Landlord and Tenant,  Landlord's Final
Working  Drawings shall be deemed to be  incorporated  in and considered part of
the  Approved  Plans,  superseding  (to the extent of any  inconsistencies)  any
inconsistent features of the previously existing Approved Plans.

         (b) Approved Plans and Working Drawings for Tenant's Work. Tenant shall
promptly  and  diligently  (and  in all  events  prior  to any  applicable  Work
Deadlines,  subject to  Landlord  Delays  and  Unavoidable  Delays)  cause to be
prepared and delivered to Landlord,  for approval,  plans and specifications for
the Improvements  constituting  Tenant's Work. Following mutual approval of such
plans and  specifications,  Tenant shall then cause to be prepared and delivered
to Landlord  final  working  drawings and  specifications  for the  Improvements
constituting Tenant's Work, including any applicable life safety, mechanical and
electrical  working  drawings and final  architectural  drawings  (collectively,
"Tenant's  Final  Working  Drawings").  Tenant's  Final Working  Drawings  shall
substantially  conform to the Approved  Plans.  Landlord  shall  either  approve
Tenant's Final Working Drawings or set forth in writing with  particularity  any
changes  necessary to bring  Tenant's  Final Working  Drawings into  substantial
conformity  with the Approved  Plans or into a form which will be  acceptable to
Landlord.  Upon  approval of Tenant's  Final  Working  Drawings by Landlord  and
Tenant,  Tenant's Final Working  Drawings shall be deemed to be  incorporated in
and considered part of


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<PAGE>


the  Approved  Plans,  superseding  (to the extent of any  inconsistencies)  any
inconsistent features of the previously existing Approved Plans.

         (c)  Cost of  Improvements.  "Cost of  Improvement"  shall  mean,  with
respect to any item or component for which a cost must be determined in order to
allocate  such cost,  or an increase in such cost,  to  Landlord  and/or  Tenant
pursuant to this Workletter,  the sum of the following  (unless otherwise agreed
in writing by Landlord and Tenant with respect to any specific item or component
or any category of items or  components):  (i) all sums paid to  contractors  or
subcontractors for labor and materials furnished in connection with construction
of such item or component; (ii) all costs, expenses,  payments, fees and charges
(other than  penalties)  paid or incurred  to or at the  direction  of any city,
county or other governmental or quasi-governmental authority or agency which are
required  to be paid in order to  obtain  all  necessary  governmental  permits,
licenses,  inspections  and approvals  relating to  construction of such item or
component;  (iii)  engineering and  architectural  fees for services rendered in
connection  with  the  design  and   construction  of  such  item  or  component
(including,  but not  limited  to,  the  applicable  Architect  for such item or
component and an electrical  engineer,  mechanical engineer and civil engineer);
(iv) sales and use taxes;  (v) testing and  inspection  costs;  (vi) the cost of
power, water and other utility facilities and the cost of collection and removal
of debris  required in connection  with  construction of such item or component;
and (vii) all other "hard" costs  incurred in the  construction  of such item or
component in accordance  with the Approved  Plans and this  Workletter.  Cost of
Improvement  shall not  include  any  project  management  fee  relating  to the
construction of such item or component.

         (d) Construction of Landlord's  Work.  Promptly  following  approval of
Landlord's Final Working  Drawings,  Landlord shall apply for and use reasonable
efforts to obtain the necessary  permits and approvals to allow  construction of
all Improvements  constituting Landlord's Work. Upon receipt of such permits and
approvals,  Landlord  shall,  at  Landlord's  sole expense  (except as otherwise
provided in the Lease or in this Workletter),  diligently construct and complete
the Improvements  constituting  Landlord's Work substantially in accordance with
the Approved  Plans,  subject to Unavoidable  Delays and Tenant Delays (if any).
Such construction  shall be performed in a neat and workmanlike manner and shall
conform to all applicable  governmental  codes, laws and regulations in force at
the time such work is  completed.  Landlord  shall use only union labor on or in
connection with Landlord's Work and shall use the General  Contractor  specified
in Paragraph 1(h) to construct all Improvements constituting Landlord's Work.

         (e)      Changes.

                  (i)  If  Landlord  determines  at any  time  that  changes  in
Landlord's  Final Working  Drawings or in any other aspect of the Approved Plans
relating to any item of  Landlord's  Work are required as a result of applicable
law or governmental requirements,  or at the insistence of any other third party
whose approval may be required with respect to the


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<PAGE>


Improvements,  or as a result of  unanticipated  conditions  encountered  in the
course of  construction,  then Landlord shall promptly (A) advise Tenant of such
circumstances  and (B) cause  revised  Approved  Plans and/or  Landlord's  Final
Working  Drawings,  as  applicable,  reflecting  such  changes to be prepared by
Architect  and,  to the  extent  such  changes  relate to items  other  than the
Building  Shell or Site  Improvements,  submitted  to  Tenant  for  approval  in
accordance with the procedure  contemplated in Paragraph 2(a) hereof. Upon final
approval of revised drawings by Landlord and Tenant (if applicable),  Landlord's
Final  Working  Drawings  and/or  Approved  Plans shall be deemed to be modified
accordingly.

                  (ii) If Tenant at any time desires any changes, alterations or
additions  to the Approved  Plans or  Landlord's  Final  Working  Drawings  with
respect to any of  Landlord's  Work,  Tenant  shall  submit a  detailed  written
request to Landlord specifying such changes, alterations or additions (a "Change
Order"). Upon receipt of any such request, Landlord shall promptly notify Tenant
of (A) whether the matters proposed in the Change Order are approved by Landlord
(which approval shall not be unreasonably withheld),  (B) Landlord's estimate of
the number of days of delay,  if any, which shall be caused by such Change Order
if implemented (including,  without limitation, delays due to the need to obtain
any  revised  plans  or  drawings  and  any  governmental  approvals),  and  (C)
Landlord's  estimate of the increase,  if any,  which shall occur in the Cost of
Improvement  for the items or  components  affected by such Change Order if such
Change  Order is  implemented  (including,  but not  limited  to,  any  costs of
compliance with laws or governmental  regulations that become applicable because
of the requested Change Order). If Tenant notifies  Landlord in writing,  within
five (5) business days after receipt of such notice from  Landlord,  of Tenant's
approval of the Change Order (including the estimated delays and cost increases,
if any, described in Landlord's  notice),  then Landlord shall cause such Change
Order to be implemented  and Tenant shall be  responsible  for all costs or cost
increases  resulting from or  attributable  to the Change Order,  subject to the
provisions of Paragraph 4 hereof.  If Tenant fails to notify Landlord in writing
of Tenant's  approval of such Change  Order  within said five (5)  business  day
period,  then such Change Order shall be deemed to be withdrawn  and shall be of
no further effect.

3.       Completion.

         (A) When Landlord  receives written  certification  from Architect that
construction of the foundation,  structural  slab on grade,  underslab  plumbing
work,  structural  steel framework,  decking and concrete on second floor,  roof
structure and  installation of main fire sprinkler lines in the Initial Building
have been  completed in  accordance  with the  Approved  Plans,  Landlord  shall
prepare  and  deliver  to  Tenant a  certificate  signed  by both  Landlord  and
Architect  (the  "Structural  Completion   Certificate")   certifying  that  the
construction  of such  portions of the Initial  Building has been  substantially
completed in  accordance  with the Approved  Plans in all material  respects and
specifying  the  date of  that  completion.  The  delivery  of  such  Structural
Completion  Certificate  shall  commence  the running of the 180-day time period
until the Rent Commencement Date under Section 2.1 of the Lease.


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<PAGE>


         (B) When Landlord  receives written  certification  from Architect that
construction of the remaining Improvements constituting Landlord's Work has been
completed in  accordance  with the Approved  Plans (except for Punch List Work),
Landlord  shall  prepare  and  deliver  to Tenant a  certificate  signed by both
Landlord and Architect (the "Final Completion  Certificate") certifying that the
construction of the remaining Improvements constituting Landlord's Work has been
substantially  completed in accordance  with the Approved  Plans in all material
respects, subject only to completion of Punch List Work, and specifying the date
of that completion.  Upon receipt by Tenant of the Final Completion Certificate,
the Improvements constituting Landlord's Work will be deemed delivered to Tenant
for all purposes of the Lease (subject to Landlord's continuing obligations with
respect to the Punch List Work).

         (C)  Notwithstanding  any other provisions of this Workletter or of the
Lease, if Landlord is delayed in substantially completing any of Landlord's Work
necessary for issuance of the Structural  Completion  Certificate as a result of
any Tenant Delay, then the 180-day period between the delivery of the Structural
Completion Certificate and the Rent Commencement Date pursuant to Section 2.1 of
the Lease  shall be  reduced,  day for day,  by the number of days by which such
Tenant Delay delayed completion of the portions of Landlord's Work necessary for
issuance of the Structural  Completion  Certificate,  and Tenant shall reimburse
Landlord in cash,  within  fifteen  (15) days after  written  demand by Landlord
(accompanied  by  reasonable  documentation  of  the  items  claimed),  for  any
increased  construction-related  costs and  expenses  incurred  by Landlord as a
result of the Tenant Delay.

         (D)  At  any  time  within  thirty  (30)  days  after  delivery  of the
Structural  Completion  Certificate  or the  Final  Completion  Certificate,  as
applicable,  Tenant  shall be  entitled  to submit one or more lists to Landlord
specifying  Punch  List  Work to be  performed  on the  applicable  Improvements
constituting  Landlord's Work, and upon receipt of such list(s),  Landlord shall
diligently  complete  such Punch List Work at Landlord's  sole  expense.  In the
event of any dispute as to  completion  of any item or component  of  Landlord's
Work, the certificate of the applicable Architect shall be conclusive.  Promptly
after Landlord provides Tenant with the Final Completion  Certificate,  Landlord
shall cause the  recordation  of a Notice of  Completion  (as defined in Section
3093 of the California Civil Code) with respect to Landlord's Work.

4.       Payment of Costs.

         (a) Landlord's  Work.  Except as otherwise  expressly  provided in this
Workletter or by mutual  written  agreement of Landlord and Tenant,  the cost of
construction  of Landlord's Work shall be borne by Landlord at its sole cost and
expense,  including  any  costs  or  cost  increases  incurred  as a  result  of
Unavoidable  Delays,  governmental  requirements  or  unanticipated  conditions;
provided,  however,  that notwithstanding any other provisions of this Paragraph
4(a), to the extent the Cost of Improvement  relating to the construction of any
item or component of  Landlord's  Work is increased as a result of any permitted
Change  Order or any  Tenant  Delay,  or as a  result  of any  "above  standard"
Building Shell components requested by


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<PAGE>


Tenant or otherwise  necessitated by Tenant's  particular use requirements or by
the  contemplated  Tenant's  Work,  or as a result of any other plan  changes or
compliance costs attributable to Tenant's  particular use requirements or to the
contemplated  Tenant's  Work,  the  amount  of  the  increase  in  the  Cost  of
Improvement with respect to such item or component shall be reimbursed by Tenant
to  Landlord in cash or, by mutual  agreement  of  Landlord  and Tenant,  may be
deducted from Landlord's maximum obligation under Paragraph 4(b) with respect to
the cost of Tenant's Work.

         (b)  Tenant's  Work.  Except as  otherwise  expressly  provided in this
Workletter or by mutual  written  agreement of Landlord and Tenant,  the cost of
construction of the Tenant Improvements shall be borne [...*...] by Landlord and
[...*...] by Tenant,  up to a maximum  Landlord's  obligation  of [...*...]  per
square  foot of space in the  Initial  Building  (measured  in  accordance  with
Section 3.1(b) of the Lease),  equating to a total Cost of Improvements  for the
Tenant  Improvements of [...*...] per square foot.  Tenant shall be responsible,
at its sole cost and expense (subject to any third-party financing  arrangements
entered  into by Tenant as  contemplated  in  Section  11.4 of the  Lease),  for
payment of  [...*...]  of the first  [...*...]  per  square  foot of the Cost of
Improvements of the Tenant Improvements,  for the entire Cost of Improvements of
the Tenant  Improvements  in excess of  [...*...]  per square  foot (if any such
excess  occurs) and for the entire cost of any Tenant's Work that is not part of
the Tenant Improvements, including (but not limited to), in each case, any costs
or cost  increases  incurred  as a result of  Unavoidable  Delays,  governmental
requirements or  unanticipated  conditions.  If Landlord's  share of the Cost of
Improvements  of the Tenant  Improvements is less than [...*...] per square foot
in the  aggregate,  the  amount  of such  difference  shall  result  in a rental
adjustment  pursuant to Section 3.1(c) of the Lease. The timing,  conditions and
other  procedures for payment or disbursement of Landlord's share of the cost of
the Tenant  Improvements  (up to the maximum  amount  specified  above) shall be
subject to mutual agreement of Landlord,  Tenant and Landlord's lender (if any).
To the extent the Cost of  Improvement  with respect to the Tenant  Improvements
exceeds  [...*...] per square foot  (reduced by [...*...]  any amounts  deducted
from Landlord's  maximum payment obligation as a result of the final sentence of
Paragraph  4(a)  hereof),  whether as a result of Change  Orders,  Tenant Delays
and/or Unavoidable  Delays or otherwise,  the amount of such excess shall in all
events be Tenant's sole responsibility and expense.

5. Tenant's Work. On or before the applicable Work Deadline (subject to Landlord
Delays and Unavoidable  Delays,  if any),  Tenant shall construct and install in
the Initial  Building the Tenant's Work,  substantially  in accordance  with the
Approved  Plans or,  with  respect to  Tenant's  Work not shown on the  Approved
Plans,  substantially  in accordance with plans and  specifications  prepared by
Tenant  and  approved  in  writing  by  Landlord  (which  approval  shall not be
unreasonably  withheld  or  delayed).   Tenant's  Work  shall  be  performed  in
accordance  with,  and  shall in all  respects  be  subject  to,  the  terms and
conditions of the Lease (to the extent not inconsistent  with this  Workletter),
and shall also be subject to the following conditions:


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                                       67

<PAGE>


         (a)  Contractor  Requirements.  The  contractor  engaged  by Tenant for
Tenant's  Work,  and any  subcontractors,  shall be duly licensed in California,
shall use only union labor on or in  connection  with Tenant's Work and shall be
subject to  Landlord's  prior  written  approval,  which  approval  shall not be
unreasonably  withheld  or  delayed.  Without  limiting  the  generality  of the
preceding  sentence,   Tenant  shall  engage  only  union  contractors  for  the
construction and installation of Tenant's furnishings, fixtures and equipment in
the Initial Building and shall require all such  contractors  engaged by Tenant,
and all of their  subcontractors,  to use only union  labor on or in  connection
with such work.

         (b) Costs and Expenses of Tenant's Work.  Subject to Landlord's payment
or  reimbursement  obligations  under  Paragraph  4(b)  hereof  with  respect to
Landlord's share of the Cost of Improvements for the Tenant Improvements, Tenant
shall  promptly pay all costs and  expenses  arising out of the  performance  of
Tenant's Work  (including the costs of permits) and shall furnish  Landlord with
evidence of payment on request.  Tenant  shall  provide  Landlord  with ten (10)
days' prior written notice before commencing any Tenant's Work. On completion of
Tenant's  Work,  Tenant  shall  deliver to Landlord a release and waiver of lien
executed  by each  contractor,  subcontractor  and  materialman  involved in the
performance of Tenant's Work.

         (c)  Indemnification.  Tenant shall  indemnify,  defend  (with  counsel
satisfactory  to Landlord)  and hold Landlord  harmless from all suits,  claims,
actions,  losses, costs and expenses (including,  but not limited to, claims for
workers'  compensation,  attorneys'  fees and costs) based on personal injury or
property  damage or contract claims  (including,  but not limited to, claims for
breach of warranty)  arising from the performance of Tenant's Work. Tenant shall
repair or replace (or, at Landlord's  election,  reimburse Landlord for the cost
of  repairing  or  replacing)  any  portion  of the  Improvements  and/or any of
Landlord's  real or personal  property  or  equipment  that is damaged,  lost or
destroyed in the course of or in  connection  with the  performance  of Tenant's
Work.

         (d)  Insurance.  Tenant's  contractors  shall  obtain  and  provide  to
Landlord  certificates  evidencing workers'  compensation,  public liability and
property damage  insurance in amounts and forms and with companies  satisfactory
to Landlord.

         (e) Rules and Regulations. Tenant and Tenant's contractors shall comply
with any other rules,  regulations  and  requirements  that  Landlord or General
Contractor  may  reasonably  impose with respect to the  performance of Tenant's
Work. Tenant's agreement with Tenant's contractors shall require each contractor
to provide  daily  cleanup  of the  construction  area to the  extent  that such
cleanup is necessitated by the performance of Tenant's Work.

         (f) Early Entry.  Landlord shall permit entry of  contractors  into the
Initial  Building  for the  purposes of  performing  Tenant's  Work,  subject to
satisfaction of the conditions set forth in the Lease.  This license to enter is
expressly conditioned on the contractor(s) retained by Tenant working in harmony
with, and not interfering with, the workers, mechanics and


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<PAGE>


contractors  of  Landlord.  If at  any  time  the  entry  or  work  by  Tenant's
contractor(s)  causes any material  interference with the workers,  mechanics or
contractors  of  Landlord,  permission  to enter may be  withdrawn  by  Landlord
immediately on written notice to Tenant.

         (g) Risk of Loss. All materials, work, installations and decorations of
any nature  brought  onto or  installed  in the Initial  Building,  by or at the
direction of Tenant or in  connection  with the  performance  of Tenant's  Work,
before the  commencement  of the Term shall be at  Tenant's  risk,  and  neither
Landlord nor any party acting on Landlord's  behalf shall be responsible for any
damage, loss or destruction thereof.

         (h) Condition of Tenant's  Work.  All work performed by Tenant shall be
performed  in a good and  workmanlike  manner,  shall be free  from  defects  in
design, materials and workmanship, and shall be completed in compliance with the
plans  approved by Landlord for such Tenant's Work in all material  respects and
in compliance  with all  applicable  governmental  laws,  ordinances,  codes and
regulations in force at the time such work is completed.

         (i) Deferral of Construction.  Notwithstanding  any other provisions of
this Paragraph 5, Tenant shall have the right to defer completion of some or all
of the  Tenant  Improvements  in up to  [...*...]  square  feet  of the  Initial
Building for up to eighteen (18) months after the Rent  Commencement  Date under
the Lease.  Landlord and Tenant acknowledge,  however, that even within the area
as to which such  completion  of Tenant  Improvements  is to be deferred,  it is
likely to be necessary to complete a portion of the Tenant  Improvements in that
area (such as, but not limited to,  plumbing  and HVAC) in order for the City of
South  San  Francisco  to  issue  a  certificate  of  occupancy  (or  reasonable
equivalent  thereof) for the Initial Building at or about the Rent  Commencement
Date, and that Tenant's right to defer  completion of Tenant  Improvements  will
not extend to any such work that is necessary  in order to obtain a  certificate
of occupancy for the Initial Building.

6. No Agency.  Nothing  contained in this  Workletter  shall make or  constitute
Tenant as the agent of Landlord.

7. Survival.  Without  limiting  survival  provisions  which would  otherwise be
implied or construed  under  applicable law, the provisions of Paragraph 5(c) of
this  Workletter  shall  survive the  termination  of the Lease with  respect to
matters occurring prior to expiration of the Lease.

8. Miscellaneous. All references in this Workletter to a number of days shall be
construed to refer to calendar days,  unless otherwise  specified herein. In all
instances  where  Tenant's  approval  is  required,  if  no  written  notice  of
disapproval  is given  within the  applicable  time  period,  at the end of that
period  Tenant shall be deemed to have given  approval  and the next  succeeding
time period shall  commence.  If any item  requiring  approval is disapproved by
Tenant  in a timely  manner,  the  procedure  for  preparation  of that item and
approval shall be repeated.


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*CONFIDENTIAL TREATMENT REQUESTED
                                       69

<PAGE>


         IN  WITNESS   WHEREOF,   the  parties  have  executed  this  Workletter
concurrently with and as of the date of the Lease.

                  "Landlord"

BRITANNIA POINTE GRAND LIMITED
PARTNERSHIP, a Delaware limited
partnership

By:      BRITANNIA POINTE GRAND,
         LLC, a California limited liability
         company, General Partner

         By:   /s/ T.J. Bristow
               -----------------------------
               T. J. Bristow
               Its Manager


                  "Tenant"

         SUGEN, INC., a Delaware corporation

         By:   /s/ Stephen Evans-Freke
               ------------------------------
               Stephen Evans-Freke
               Its Chairman and Chief Executive
                  Officer


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<PAGE>


                           Schedule C-1 to Workletter

                          DEFINITION OF BUILDING SHELL


The "Building  Shell" as defined in the Workletter to which this Schedule C-1 is
attached shall consist of the following:


A  standard  shell for a  building  to be  constructed  for a  biotech  company,
considering  the uses set forth in this Lease,  including but not limited to the
following elements and improvements:

Building envelope  (reinforced  grade beam  foundation on  prestressed  concrete
         piles;  ground floor to be 10" thick reinforced concrete slab supported
         by concrete  piles;  second floor to have metal  decking with  concrete
         topping  slab;  roof  structure to be metal deck with concrete for mass
         dampening in areas to receive mechanical equipment and rigid insulation
         over the  balance (at least R-19 to meet Title 24  calculations);  roof
         membrane to be built-up  system,  four-ply  minimum  including  mineral
         fiber cap  sheet,  with  flashing  and  sealants;  building  structural
         framing to consist of steel beams, girders,  columns with a non-bearing
         exterior  curtain wall;  seismic system  utilizing steel braced frames;
         floor system  designed  with live load  capacity of 100 psf;  roof live
         load to be 20 psf  with 50 psf in  center  bays to  receive  mechanical
         loads; floor to floor heights of 17 feet)

Elevator pit

Interior stairs

Roof drains and drain lines

One (1) hour fire protection on columns and beams

Subsurface piping (water, gas, sewer lateral, storm water) sized to Tenant's use
         requirements;  sanitary  plumbing gut line cost to be allocated  50% to
         shell and 50% to Tenant Improvements

Trash enclosure/fence/metal gate

Two (2) or more rollup doors, one (1) dock high door or scissors lift

Utilities:
         site lighting and exterior lighting
         electric transformer


                                       71

<PAGE>


         underground  electrical to building  pull-section
         gas to exterior meter on building
         telephone conduit to building
         site storm drain system
         main sanitary  sewer line under  ground floor slab
         domestic  fire and water lines stubbed into building
         automatic  fire  sprinkler  system (for shell,  but excluding  drops to
            suspended ceilings)
         utility connection and development fees for systems which are part of 
            shell (but excluding fees based on facilities or elements that are
            part of Tenant Improvements)


                                       72

<PAGE>


                           Schedule C-2 to Workletter

                        DEFINITION OF TENANT IMPROVEMENTS


The "Tenant  Improvements"  as defined in the  Workletter to which this Schedule
C-2 is attached shall include, but not necessarily be limited to, the following:

Toilet cores

Elevator(s)

Specialty  items,  such as skylights

Variable  air volume HVAC system

Building exhaust system

Service yard enclosures

Equipment pad

Roof top mechanical screen

Utilities:
         All electrical  beyond  pull   section,   including   electrical   main
            disconnect and distribution panels
         Gas piping beyond main gas meter
         Telephone conduit beyond utility company  termination point (inside the
            building), and PVC conduit for telephone/data connections (wiring or
            fiber optics) to future buildings
         Sanitary sewer lines to main "gut" line under ground floor
         Laboratory gas piping
         Communications wiring
         Utility  connection  fees  based  on  items  that  are  part of  Tenant
            Improvements

Air Compressor with Dryer/Tank

Purified Water System with Storage Tank

Emergency Generator

Vacuum Pump

Casework

Fume Hoods, Laminor Flow Hoods


                                       73

<PAGE>



Mechanical,  Electrical,  Plumbing Infrastructure not included in Building Shell
   and not otherwise described above

Automatic Gas Manifolds

Process Cooling Water Chiller

Animal Rooms, Epoxy Flooring, Animal Racks

Office  Areas,  Interior  Partitioning,   Floor  Coverings,  Lighting,  Interior
Finishes

Cold Rooms

Tissue Culture Rooms

Automatic fire sprinkler system drops to suspended ceilings


                                       74

<PAGE>


                                    EXHIBIT D


                         ESTIMATED CONSTRUCTION SCHEDULE


         [to be promptly  developed by Landlord and reviewed and agreed
         upon by the parties  following  execution of Lease,  but in no
         event later than June 23, 1997; among other things,  shall (1)
         include  a series of window  dates for  significant  tasks and
         procedures, including (but not limited to) the need for Tenant
         to provide details for shell  modifications  (steel,  etc.) to
         accommodate  HVAC,  plumbing,  etc.  within  a  period  to  be
         specified, and (2) provide for an anticipated final completion
         date for all tenant  improvements  and  occupancy by Tenant no
         later than October 31, 1998]


                                       75

<PAGE>


                                    EXHIBIT E


                    ACKNOWLEDGEMENT OF RENT COMMENCEMENT DATE


      This  Acknowledgement  is  executed  as of  _________________,  199__,  by
BRITANNIA  POINTE GRAND  LIMITED  PARTNERSHIP,  a Delaware  limited  partnership
("Landlord"),  and SUGEN, INC., a Delaware corporation  ("Tenant"),  pursuant to
Section 2.4 of the Build-to-Suit Lease dated June ___, 1997 between Landlord and
Tenant (the "Lease")  covering  premises  located at ________ East Grand Avenue,
South San Francisco, CA 94080 (the "Initial Building").

      Landlord and Tenant hereby acknowledge and agree as follows:

      1. The Rent  Commencement  Date  under  the  Lease is  __________________,
199__.

      2. The Termination Date under the Lease shall be _________________, 201__,
subject  to any  applicable  provisions  of the  Lease  for  extension  or early
termination thereof.

      3. Based on the final cost of the  Improvements  and on any change orders,
delays and other factors reflected in that cost, the rent schedule under Section
3.1(a) of the Lease is amended to read as shown in the schedule  attached hereto
and incorporated herein by this reference.

      4. Tenant accepts the Initial  Building and  acknowledges the satisfactory
completion of all Improvements thereon required to be made by Landlord,  subject
only to any applicable "punch


                                       76

<PAGE>


list" or similar procedures  specifically  provided under the Lease or under the
Workletter governing such work.

     EXECUTED as of the date first set forth above.


              "Landlord"

BRITANNIA POINTE GRAND LIMITED
PARTNERSHIP, a Delaware limited
partnership

By:   BRITANNIA POINTE GRAND, LLC,
      a California limited liability company,
      General Partner

      By: __________________________
          Its Manager


               "Tenant"

SUGEN, INC., a Delaware corporation

By: _______________________________
Its: ______________________________


                                       77



                                                                   EXHIBIT 10.64


                                           *** TEXT OMITTED AND FILED SEPARATELY
                                                CONFIDENTIAL TREATMENT REQUESTED
                                             UNDER 17 C.F.R. SS.SS.200.80(B)(4),
                                                            200.83 AND 240.24B-2



THE SECURITIES  REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES
ACT OF 1933, AS AMENDED (THE "ACT"),  OR UNDER THE SECURITIES LAWS OF ANY STATE.
THESE SECURITIES ARE SUBJECT TO RESTRICTIONS ON  TRANSFERABILITY  AND RESALE AND
MAY NOT BE  TRANSFERRED  OR  RESOLD  EXCEPT AS  PERMITTED  UNDER THE ACT AND THE
APPLICABLE  STATE  SECURITIES  LAWS,   PURSUANT  TO  REGISTRATION  OR  EXEMPTION
THEREFROM.  THE ISSUER OF THESE  SECURITIES MAY REQUIRE AN OPINION OF COUNSEL IN
FORM AND  SUBSTANCE  SATISFACTORY  TO THE ISSUER TO THE EFFECT THAT ANY PROPOSED
TRANSFER  OR  RESALE  IS IN  COMPLIANCE  WITH THE ACT AND ANY  APPLICABLE  STATE
SECURITIES LAWS.

                                   SUGEN, INC.

               WARRANT FOR THE PURCHASE OF SHARES OF COMMON STOCK

June 30, 1997                                                   [...*...] Shares

         For Value Received, SUGEN, Inc. a Delaware corporation (the "Company"),
with its principal  office at 351  Galveston  Drive,  Redwood  City,  California
94063-4720,  hereby  certifies  that SDK  Incorporated,  a Delaware  corporation
("Holder"),   or  its  assigns,  in  partial   consideration  for  that  certain
Build-to-Suit Lease dated June 11, 1997 between the Company and Britannia Pointe
Grand Limited  Partnership,  a Delaware  limited  partnership  ("Landlord"),  is
entitled,  subject to the  provisions  of this  Warrant,  to  purchase  from the
Company,  at any time before 5:00 p.m.  (Pacific  Daylight Time) [...*....] (the
"Expiration Date"), the number of fully paid and nonassessable  shares of Common
Stock of the Company  set forth  above,  subject to  adjustment  as  hereinafter
provided.

         Holder may purchase such number of shares of Common Stock at a purchase
price per share (as  appropriately  adjusted  pursuant  to  Section 6 hereof) of
[...*...]  (the  "Exercise  Price").  The term  "Common  Stock"  shall  mean the
aforementioned  Common  Stock of the  Company,  together  with any other  equity
securities  that  may be  issued  by  the  Company  in  addition  thereto  or in
substitution therefor as provided herein.


- ---------------------------
*CONFIDENTIAL TREATMENT REQUESTED
                                       1.

<PAGE>


         The number of shares of Common  Stock to be received  upon the exercise
of this Warrant and the price to be paid for a share of Common Stock are subject
to adjustment from time to time as hereinafter  set forth.  The shares of Common
Stock  deliverable  upon such  exercise,  as  adjusted  from  time to time,  are
hereinafter sometimes referred to as "Warrant Shares."

         Section 1. EXERCISE OF WARRANT.  This Warrant may be exercised in whole
or in part,  but in no more than three  parts,  on any business day prior to the
Expiration  Date by  presentation  and  surrender  hereof to the  Company at its
principal office at the address set forth in the initial paragraph hereof (or at
such other address as the Company may  hereafter  notify Holder in writing) with
the Purchase Form annexed hereto duly executed and accompanied by proper payment
of the  Exercise  Price in lawful  money of the United  States of America in the
form of a check,  subject  to  collection,  for the  number  of  Warrant  Shares
specified in the  Purchase  Form.  If this  Warrant  should be exercised in part
only, the Company shall,  upon surrender of this Warrant,  execute and deliver a
new  Warrant  dated as of the date  hereof and  evidencing  the rights of Holder
thereof to purchase  the balance of the Warrant  Shares  purchasable  hereunder.
Upon receipt by the Company of this  Warrant and such  Purchase  Form,  together
with  proper  payment of the  Exercise  Price,  at the  principal  office of the
Company,  Holder  shall be  deemed to be the  holder  of  record of the  Warrant
Shares,  notwithstanding that the stock transfer books of the Company shall then
be closed or that  certificates  representing such Warrant Shares shall not then
be actually delivered to Holder.

         In  addition  to and without  limiting  the rights of Holder  under any
other terms set forth herein,  Holder shall have the right, upon written request
by Holder delivered or transmitted to the Company together with this Warrant, to
exchange  this  Warrant,  in  whole  or in part at any  time  on or  before  the
Expiration  Date, for the number of shares of Common Stock of the Company having
an aggregate  current  market price on the date of such exchange  (determined as
provided in Section 3 below) equal to the  difference  between (a) the aggregate
current market value on the date of such exchange (determined as aforesaid) of a
number of Warrant Shares designated by Holder (the "Designated Shares"), and (b)
the aggregate  Exercise  Price Holder would have paid to the Company to purchase
the Designated  Shares upon exercise of this Warrant.  Upon such  exchange,  the
number of Warrant  Shares  purchasable  upon  exercise of this Warrant  shall be
reduced by the number of  Designated  Shares  and,  if a balance of  purchasable
Warrant  Shares  remains  after such  exchange,  the Company  shall  execute and
deliver to Holder a new Warrant dated as of the date hereof and  evidencing  the
right to purchase such balance of Warrant Shares;  provided,  that no fractional
shares  shall be  issuable  upon such  exchange,  and if the number of shares of
Common Stock determined in accordance with the foregoing formula is other than a
whole  number,  the Company  shall pay Holder an amount by check,  determined in
accordance with the provisions of Section 3.

         Section 2. RESERVATION OF SHARES. The Company hereby agrees that at all
times there shall be reserved for issuance  and delivery  upon  exercise of this
Warrant all shares of its Common Stock or other  shares of capital  stock of the
Company  from time to time  issuable  upon  exercise of this  Warrant.  All such
shares  shall  be duly  authorized  and,  when  issued  upon  such  exercise  in
accordance with the terms of this Warrant,  shall be validly issued,  fully paid
and nonassessable,  free and clear of all liens, security interests, charges and
other  encumbrances  or  restrictions  on sale  (other  than as  provided in the
Company's certificate of incorporation and any


                                       2.

<PAGE>


restrictions  on sale set forth  herein or  pursuant to  applicable  federal and
state securities laws) and free and clear of all preemptive rights.

         Section 3. FRACTIONAL INTEREST. The Company will not issue a fractional
share of Common  Stock upon  exercise of a Warrant.  Instead,  the Company  will
deliver its check for the current  market  value of the  fractional  share.  The
current market value of a fraction of a share is determined as follows: multiply
the current  market  price of a full share by the  fraction of a share and round
the result to the nearest cent.

         The current  market  price of a share of Common  Stock for  purposes of
this Section 3 is the last reported  sales price of the Common Stock on the last
trading day prior to the  exercise  date,  as  reported  by the Nasdaq  National
Market, or the primary national securities exchange on which the Common Stock is
then quoted;  provided,  however,  that if the Common Stock is neither traded on
the Nasdaq  National  Market nor on a national  securities  exchange,  the price
referred to above shall be the closing price  reflected in the over-the  counter
market  for the last  trading  day prior to the  exercise  date for which such a
price is reported,  as reported by the National  Quotation  Bureau,  Inc. or any
organization  performing a similar  function,  or if closing  price are not then
routinely  reported for the  over-the-counter  market, the mean between the last
bid and asked  prices  reported  for the last  trading day prior to the exercise
date for which such prices are reported.

         Section 4.  TRANSFERS; ASSIGNMENT OR LOSS OF WARRANT.

                  (a) Subject to the terms and conditions contained in paragraph
(b) below and in Section 9 hereof,  this  Warrant and all rights  hereunder  are
transferable  in  whole  or in part by  Holder  and  any  successor  transferee;
provided that,  except with respect to transfers to Landlord,  to any partner of
Landlord,  to any person or entity  controlling,  controlled  by or under common
control  with  Holder,  Landlord or any  partner of Landlord or to the  National
Electrical  Benefit Fund,  prior to such transfer  Holder shall give thirty (30)
days prior written  notice of any such transfer to the Company,  and the Company
shall have the right to  acquire  the  Warrant  under the  identical  provisions
contained in such notice by giving Holder  written  notice  within  fifteen (15)
days of receipt of such notice.  The Company's failure to respond to said notice
within  said  fifteen  (15) days shall be deemed a waiver of this right of first
refusal. The transfer shall be recorded on the books of the Company upon receipt
by the Company of the Transfer Notice annexed hereto,  at its principal  offices
and the  payment to the  Company of all  transfer  taxes and other  governmental
charges imposed on such transfer.

                  (b) Holder  shall not,  without  obtaining  the prior  written
consent of the Company, which consent shall not be unreasonably withheld, assign
its  interest  in this  Warrant  in whole or in part to any  person or  persons,
except that Holder shall have the right,  without the Company's consent but with
prior or concurrent  written notice to the Company,  to transfer this Warrant to
Landlord,  to any  partner of  Landlord,  to any  person or entity  controlling,
controlled  by or under common  control with Holder,  Landlord or any partner of
Landlord or to the  National  Electrical  Benefit Fund (so long as the number of
such  transferee  partners  or  affiliates  does  not  exceed  five  (5)  in the
aggregate),  subject to compliance with applicable  federal and state securities
laws. Subject to the provisions of Section 9, upon surrender of this Warrant


                                       3.

<PAGE>


to the Company or at the office of its stock  transfer  agent or warrant  agent,
with the Assignment  Form annexed  hereto duly executed and funds  sufficient to
pay any transfer tax, the Company shall,  without charge,  execute and deliver a
new Warrant or Warrants  dated as of the date hereof and  registered in the name
of the assignee or assignees  named in such  instrument of assignment  (any such
assignee  will then be a "Holder" for purposes of this Warrant) and, if Holder's
entire interest is not being assigned,  in the name of Holder,  and this Warrant
shall promptly be canceled.

                  (c) Upon  receipt of evidence  satisfactory  to the Company of
the  loss,  theft,  destruction  or  mutilation  of this  Warrant,  (such  as an
affidavit  of the  registered  Holder)  and  (in  the  case of  loss,  theft  or
destruction) of indemnification  satisfactory to the Company, and upon surrender
and  cancellation of this Warrant,  if mutilated,  the Company shall execute and
deliver a new Warrant of like tenor and date.  In the event that this Warrant is
lost, stolen, destroyed or mutilated, Holder shall pay all reasonable attorneys'
fees and expenses  incurred by the Company in connection with the replacement of
this Warrant and the issuance of a new Warrant.

         Section 5. RIGHTS OF HOLDER.  Holder  shall not, by virtue  hereof,  be
entitled to any rights of a stockholder in the Company, either at law or equity,
and the rights of Holder are limited to those expressed in this Warrant. Nothing
contained in this Warrant  shall be construed as  conferring  upon Holder hereof
the right to vote or to  consent or to receive  notice as a  stockholder  of the
Company on any matters or with respect to any rights whatsoever as a stockholder
of the Company.  No dividends or interest shall be payable or accrued in respect
of this  Warrant  or the  interest  represented  hereby  or the  Warrant  Shares
purchasable  hereunder  until,  and only to the extent that,  this Warrant shall
have been exercised in accordance with its terms.

         Section 6.  ADJUSTMENT  OF  EXERCISE  PRICE AND  NUMBER OF SHARES.  The
number and kind of securities  purchasable upon the exercise of this Warrant and
the  Exercise  Price shall be subject to  adjustment  from time to time upon the
beginning of certain events, as follows:

                  (a)  Adjustment  for Change in Capital  Stock.  If at any time
after the date hereof the Company:

                       (A) pays  a   dividend   in  Common   Stock  or  makes  a
                           distribution  on its  Common  Stock in  shares of its
                           Common Stock;

                       (B) subdivides  its  outstanding  shares of Common  Stock
                           into a greater number of shares;

                       (C) combines its outstanding  shares of Common Stock into
                           a smaller number of shares;

                       (D) makes a distribution on its Common Stock in shares of
                           its capital stock other than Common Stock; or


                                       4.

<PAGE>



                       (E) issues  by   reclassification,   recapitalization  or
                           reorganization of its Common Stock or in exchange for
                           its Common Stock any shares of its capital stock;

then the  Exercise  Price in effect  immediately  prior to such  action  and the
number and kind (if applicable) of securities  purchasable upon exercise of this
Warrant  shall be  adjusted so that  Holder may  receive  upon  exercise of this
Warrant and payment of the same aggregate  consideration the number of shares of
capital stock of the Company which Holder would have owned immediately following
such  action if Holder had  exercised  this  Warrant  immediately  prior to such
action.

         The adjustment shall become effective immediately after the record date
in the case of a dividend or distribution  and  immediately  after the effective
date in the case of a subdivision, combination or reclassification.

                  (b) Minimum Adjustment.  All calculations under this Section 6
shall be made to the nearest cent or to the nearest share, as the case may be.

                  (c)  Deferral of Issuance or Payment.  In any case in which an
event covered by this Section 6 shall require that an adjustment in the Exercise
Price be made  effective  as of a record  date,  the  Company may elect to defer
until the  occurrence  of such event (i) issuing to Holder,  if this  Warrant is
exercised  after such record date,  the shares of Common Stock and other capital
stock of the Company,  if any,  issuable  upon such  exercise over and above the
shares of Common Stock or other capital stock of the Company,  if any,  issuable
upon such  exercise on the basis of the  Exercise  Price in effect prior to such
adjustment,  and (ii)  paying  to  Holder  by check  any  amount  in lieu of the
issuance of fractional shares pursuant to Section 3.

                  (d)  When No  Adjustment  Required.  No  adjustment  shall  be
required for a change in the par value or no par value of the Common  Stock.  To
the extent this Warrant becomes  exercisable  into cash, no adjustment  shall be
required thereafter as to the cash, and interest will not accrue on the cash.

                  (e) Notice of Certain Actions. In the event that:

                      (A)  the  Company  shall  authorize  the  issuance  to all
holders  of its  Common  Stock  of  rights,  warrants,  options  or  convertible
securities  to  subscribe  for or purchase  shares of its Common Stock or of any
other subscription rights, warrants, options or convertible securities; or

                      (B) the Company shall  authorize the  distribution  to all
holders of its Common Stock of evidences of its  indebtedness  or assets  (other
than dividends paid in or distributions of the Company's capital stock for which
the Exercise  Price shall have been adjusted  pursuant to subsection (a) of this
Section 6 or cash dividends or cash  distributions  payable out of  consolidated
current or  retained  earnings  as shown on the books of the Company and paid in
the ordinary course of business); or


                                       5.

<PAGE>


                      (C) the Company shall authorize any capital reorganization
or reclassification of the Common Stock (other than a subdivision or combination
of the  outstanding  Common  Stock and  other  than a change in par value of the
Common Stock) or any consolidation or merger to which the Company is a party and
for which approval of any  stockholders of the Company is required (other than a
consolidation  or merger in which the Company is the continuing  corporation and
that does not  result in any  reclassification  or  change of the  Common  Stock
outstanding),  or the conveyance or transfer of the properties and assets of the
Company as an entirety or substantially as an entirety; or

                      (D)  the  Company  is  the  subject  of  a  voluntary   or
involuntary dissolution, liquidation or winding-up procedure; or

                      (E) the Company  proposes  to take any action  (other than
actions of the  character  described in  subsection  (a) of this Section 6) that
would require an adjustment of the Exercise Price pursuant to this Section 6;

then the Company  shall  cause to be mailed by  first-class  mail to Holder,  at
least ten (10) days prior to the applicable record or effective date hereinafter
specified, a notice stating (x) the date as of which the holders of Common Stock
of record to be entitled to receive any such rights,  warrants or  distributions
are to be determined and the date on which distribution of such rights, warrants
or  distributions  is  expected  to be made,  or (y) the date on which  any such
consolidation,   merger,  conveyance,  transfer,  dissolution,   liquidation  or
winding-up  is  expected  to  become  effective,  and the date as of which it is
expected  that  holders of Common  Stock of record shall be entitled to exchange
their  shares  of  Common  Stock  for  securities  or  other  property,  if any,
deliverable upon such reorganization,  reclassification,  consolidation, merger,
conveyance, transfer, dissolution, liquidation or winding-up; provided, however,
that Holder shall make a best efforts  attempt to respond to such notice (to the
extent any such  response is required or permitted  hereunder  or is  reasonably
requested by the Company) as early as possible after the receipt thereof.

                  (f) No Adjustment  After  Exercise of Warrant.  No adjustments
shall be made  under any  Section  herein in  connection  with the  issuance  of
Warrant Shares after exercise of this Warrant.

         Section 7. NOTICE OF  ADJUSTMENT.  Upon any  adjustment of the Exercise
Price or any  increase  or  decrease  in the  number of  shares of Common  Stock
purchasable  upon the exercise of this  Warrant,  the Company shall give written
notice  thereof,  by certified or registered  mail,  postage  prepaid and return
receipt  requested,  addressed to the  registered  Holder at the address of such
Holder as shown on the books of the  Company.  The notice shall be signed by the
Company's chief  financial  officer and shall state the Exercise Price resulting
from such  adjustment  and the  increase or  decrease,  if any, in the number of
shares  purchasable  at such price upon the  exercise of this  Warrant,  setting
forth in reasonable  detail the method of  calculation  and the facts upon which
such calculation is based.

         Section 8. RECLASSIFICATION,  REORGANIZATION,  CONSOLIDATION OR MERGER.
In the event of any reclassification,  capital reorganization or other change of
outstanding shares of


                                       6.

<PAGE>


Common Stock of the Company  (other than a  subdivision  or  combination  of the
outstanding  Common Stock and other than a change in the par value of the Common
Stock) or in the event of any  consolidation  or merger of the  Company  with or
into  another  corporation  (other  than a merger  in which the  Company  is the
continuing corporation and that does not result in any reclassification, capital
reorganization  or other  change of  outstanding  shares of Common  Stock of the
class  issuable  upon  exercise  of this  Warrant)  or in the event of any sale,
lease,  transfer or conveyance to another corporation of the property and assets
of the Company as an  entirety  or  substantially  as an  entirety,  the Company
shall, as a condition precedent to such transaction,  cause effective provisions
to be made so that Holder shall have the right  thereafter,  by exercising  this
Warrant (in lieu of the shares of the Common  Stock of the  Company  immediately
theretofore  purchasable and receivable upon exercise of the rights  represented
hereby) to purchase the kind and amount of shares of stock and other  securities
and property  (including  cash) receivable upon such  reclassification,  capital
reorganization and other change, consolidation,  merger, sale or conveyance by a
holder of the number of shares of Common  Stock  that  might have been  received
upon  exercise  of this  Warrant  immediately  prior  to such  reclassification,
capital  reorganization,  change,  consolidation,  merger,  sale or  conveyance;
provided,  however, that in the event (a) the value of the stock,  securities or
other assets or property  (determined in good faith by the Board of Directors of
the  Company)  issuable or payable with respect to one share of the Common Stock
of the Company  immediately  theretofore  purchasable  and  receivable  upon the
exercise of the rights  represented  hereby is in excess of the  Exercise  Price
hereof  effective  at the  time  of  the  merger  (after  giving  effect  to any
adjustment  in such Exercise  Price  required to be made under the terms of this
Warrant),  and (b) the securities received in such  reorganization,  if any, are
publicly  traded,  then this Warrant shall expire unless  exercised prior to the
reorganization.  Any such provision shall include  provisions for adjustments in
respect of such shares of stock and other  securities and property that shall be
as nearly  equivalent as may be practicable to the  adjustments  provided for in
this Warrant.  The foregoing  provisions of this Section 8 shall similarly apply
to successive  reclassifications,  capital reorganizations and changes of shares
of Common Stock and to successive consolidations, mergers, sales or conveyances.
In the  event  that in  connection  with  any  such  capital  reorganization  or
reclassification,  consolidation,  merger, sale or conveyance, additional shares
of Common  Stock  shall be  issued  in  exchange,  conversion,  substitution  or
payment,  in whole or in part,  for or of, a security of the Company  other than
Common  Stock,  any such  issue  shall be  treated  as an issue of Common  Stock
covered by the provisions of subsection (a) of Section 6.

         Section 9.  TRANSFER TO COMPLY WITH THE  SECURITIES  ACT OF 1933.  This
Warrant may not be  exercised  and neither  this  Warrant nor any of the Warrant
Shares, nor any interest in either,  may be offered,  sold,  assigned,  pledged,
hypothecated,  encumbered or in any other manner  transferred or disposed of, in
whole or in part, except in compliance with applicable United States federal and
state  securities  or blue sky laws and the terms and  conditions  hereof.  Each
Warrant  shall  bear a legend in  substantially  the same form as the legend set
forth on the first page of this Warrant.  Each  certificate  for Warrant  Shares
issued  upon  exercise  of this  Warrant,  unless at the time of  exercise  such
Warrant Shares are acquired  pursuant to a registration  statement that has been
declared effective under the Securities Act of 1933, as amended (the "Securities
Act"),  and applicable blue sky laws,  shall bear a legend  substantially in the
following form:


                                       7.

<PAGE>


    THE SECURITIES  REPRESENTED  HEREBY HAVE NOT BEEN REGISTERED  UNDER THE
    SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), OR UNDER THE SECURITIES
    LAWS OF ANY STATE.  THESE  SECURITIES  ARE SUBJECT TO  RESTRICTIONS  ON
    TRANSFERABILITY  AND RESALE AND MAY NOT BE TRANSFERRED OR RESOLD EXCEPT
    AS PERMITTED UNDER THE ACT AND THE APPLICABLE  STATE  SECURITIES  LAWS,
    PURSUANT TO  REGISTRATION OR EXEMPTION  THEREFROM.  THE ISSUER OF THESE
    SECURITIES  MAY  REQUIRE AN  OPINION  OF COUNSEL IN FORM AND  SUBSTANCE
    SATISFACTORY TO THE ISSUER TO THE EFFECT THAT ANY PROPOSED  TRANSFER OR
    RESALE  IS  IN  COMPLIANCE  WITH  THE  ACT  AND  ANY  APPLICABLE  STATE
    SECURITIES LAWS.

Any  certificate  for any  Warrant  Shares  issued  at any time in  exchange  or
substitution  for any  certificate  for any Warrant  Shares  bearing such legend
(except a new certificate for any Warrant Shares issued after the acquisition of
such Warrant Shares pursuant to a registration  statement that has been declared
effective under the Securities  Act) shall also bear such legend unless,  in the
opinion of counsel for the Company,  the Warrant Shares represented thereby need
no longer be subject to the restriction contained herein. The provisions of this
Section 9 shall be  binding  upon all  subsequent  holders of  certificates  for
Warrant  Shares  bearing  the above  legend and all  subsequent  holders of this
Warrant, if any.

         Section 10.  REPRESENTATIONS  AND COVENANTS OF HOLDER. This Warrant has
been entered into by the Company in reliance upon the following  representations
and covenants of Holder, which by its execution hereof Holder hereby confirms:

                  (a) Investment Purpose. The right to acquire Common Stock, and
any Common Stock issued upon exercise of Holder's rights contained herein,  will
be acquired for  investment and not with a view to the sale or  distribution  of
any part thereof,  and Holder has no present intention of selling or engaging in
any  public  distribution  of the same  except  pursuant  to a  registration  or
exemption.

                  (b)  Private  Issue.  Holder  understands  (i) that the Common
Stock  issuable  upon  exercise  of  Holder's  rights  contained  herein  is not
registered  under  the  Securities  Act  or  qualified  under  applicable  state
securities  laws on the ground that the  issuance  contemplated  by this Warrant
will be exempt from the registration and qualification requirements thereof, and
(ii)  that  the  Company's  reliance  on such  exemption  is  predicated  on the
representations set forth in this Section 10.

                  (c)  Disposition of Holder's  Rights.  In no event will Holder
make a  disposition  of any of its rights to  acquire  Common  Stock,  or of any
Common Stock issued upon exercise of such rights,  unless and until (i) it shall
have notified the Company of the proposed disposition,  and (ii) if requested by
the  Company,  it shall have  furnished  the Company  with an opinion of counsel
(which counsel may either be inside or outside  counsel to Holder)  satisfactory
to the  Company  and its  counsel  to the  effect  that (A)  appropriate  action
necessary  for  compliance  with the  Securities  Act has been taken,  or (B) an
exemption from the registration requirements


                                       8.

<PAGE>


of  the  Securities  Act  is  available.   Notwithstanding  the  foregoing,  the
restrictions  imposed upon the  transferability  of any of its rights to acquire
Common  Stock,  or of any Common  Stock issued on the exercise of such rights do
not apply to transfers  from the beneficial  owner of any of the  aforementioned
securities  to its nominee or from such  nominee to its  beneficial  owner,  and
shall  terminate  as to any  particular  share  of  Common  Stock  when (1) such
security shall have been  effectively  registered  under the Act and sold by the
holder  thereof in accordance  with such  registration,  (2) such security shall
have  been  sold  without  registration  in  compliance  with Rule 144 under the
Securities  Act, or (3) a letter shall have been issued to Holder at its request
by the staff of the  Securities  and Exchange  Commission or a ruling shall have
been issued to Holder at its request by such  Commission  stating that no action
shall be recommended by such staff or taken by such Commission,  as the case may
be, if such security is transferred  without  registration  under the Securities
Act in accordance  with the conditions  set forth in such letter or ruling,  and
such letter or ruling specifies that no subsequent  restrictions on transfer are
required.  Whenever the  restrictions  imposed  hereunder  shall  terminate,  as
hereinabove  provided,  Holder  or a holder  of a share  of  Common  Stock  then
outstanding as to which such  restrictions  have terminated shall be entitled to
receive  from the  Company,  without  expense  to such  holder,  one or more new
certificates  for the Warrant or for such shares of Common Stock not bearing any
restrictive legend.

                  (d) Financial  Risk.  Holder has such knowledge and experience
in financial and business  matters as to be capable of evaluating the merits and
risks of its  investment  and has the ability to bear the economic  risks of its
investment.

                  (e) Risk of No  Registration.  Holder  understands that if the
Company does not register with the Securities and Exchange  Commission  pursuant
to Section 12 of the Securities  Act, or file reports  pursuant to Section 15(d)
of the Securities  Exchange Act of 1934, as amended (the "Exchange Act), or if a
registration  statement  covering the securities under the Securities Act is not
in effect when Holder  desires to sell (i) the rights to purchase  Common  Stock
pursuant to this  Warrant,  or (ii) the Common Stock issued upon exercise of the
right to  purchase,  Holder  may be  required  to hold  such  securities  for an
indefinite period. Holder also understands that any sale of the rights of Holder
to purchase Common Stock, or of any Common Stock,  which might be made by Holder
in  reliance  upon  Rule  144  under  the  Securities  Act may be  made  only in
accordance with the terms and conditions of that Rule.

                  (f) Accredited  Investor.  Holder is an "accredited  investor"
within the  meaning of the  Securities  and  Exchange  Commission's  Rule 501 of
Regulation D, as presently in effect.

         Section 11.  REGISTRATION RIGHTS.

                  (a) If at any time the Company shall determine to register any
of its  securities  under the  Securities  Act either for its own account or the
account of a security  holder or  holders,  other than a  registration  relating
solely to employee  benefit plans,  or a registration  relating solely to a Rule
145 transaction, or a registration on any registration form that does not permit
secondary sales, then the Company will:

                      (A) promptly give to Holder a written notice thereof; and


                                       9.

<PAGE>


                      (B) use its best  efforts to include in such  registration
(and any related qualification under blue sky laws or other compliance),  except
as set forth in Section 11(b) below, and in any underwriting  involved  therein,
all of the Warrant  Shares  specified in a written  request or requests  made by
Holder and received by the Company within ten (10) days after the written notice
from the Company  described  in clause (A) above is mailed or  delivered  by the
Company. Such written request may specify all or a part of the Warrant Shares.

                  (b) If the  registration  of which the Company gives notice to
Holder is for a  registered  public  offering  involving  an  underwriting,  the
Company shall so advise Holder as a part of the written notice given pursuant to
Section 11(a)(A). In such event, the right of Holder to registration pursuant to
Section  11(a)  shall  be  conditioned  upon  Holder's   participation  in  such
underwriting  and  the  inclusion  of all  or any  part  of the  Warrant  Shares
specified in Holder's notice in the  underwriting to the extent provided herein.
Holder shall  (together  with the Company and the other holders of securities of
the Company with registration rights to participate  therein  distributing their
securities  through such underwriting)  enter into an underwriting  agreement in
customary  form  with the  representative  of the  underwriter  or  underwriters
selected by the Company.

         Notwithstanding  any other  provision of Sections  11(a) or (b), if the
representative of the underwriters advises the Company in writing that marketing
factors  require a limitation  on the number of shares to be  underwritten,  the
representative  may (subject to the  limitations set forth below) exclude all of
the Warrant  Shares from,  or limit the number of Warrant  Shares to be included
in, the  registration and  underwriting.  The Company shall so advise Holder and
other holders of securities  requesting  registration,  and the number of shares
that are entitled to be included in the registration  and underwriting  shall be
allocated first to the Company for securities being sold for its own account and
thereafter  the  number  of  shares  that are  entitled  to be  included  in the
registration  shall be  allocated  among  Holder  and other  holders  requesting
inclusion of shares on a pro rata basis,  subject to any prior  agreements among
the Company and its other  stockholders,  but only to the extent that such other
agreements provide for additional limitations on the number of shares such other
stockholders  or the Company  will be  entitled to include in the  registration,
which  agreements  are in effect as of the date  hereof.  If Holder or any other
person  does not agree to the  terms of any such  underwriting,  Holder  and any
other such person shall be excluded therefrom by written notice from the Company
or the underwriter. Any Warrant Shares or other securities excluded or withdrawn
from such underwriting shall also be withdrawn from such registration.

                  (c) As used  herein,  "Registration  Expenses"  shall mean all
expenses  incurred by the Company in complying with this Section 11,  including,
without  limitation,  all registration,  qualification and filing fees; printing
expenses;  fees and  disbursements  of counsel  for the Company and the fees and
disbursements  of counsel for the  Company in its  capacity as counsel to Holder
and  other  holders  hereunder;  if due to an actual or  potential  conflict  of
interest  Company counsel does not make itself  available for this purpose,  the
Company will pay the reasonable fees and disbursements of one counsel for Holder
and other  holders as  mutually  agreed  upon by all such  holders;  fees of the
Company's  independent  accounting  firm;  blue sky fees and  expenses;  and the
expense of any special audits  incident to or required by any such  registration
(but excluding the compensation of regular employees of the Company which shall


                                       10.

<PAGE>


be paid in any event by the Company).  All  Registration  Expenses in connection
with any  registration  pursuant to Section  11(a)  hereof shall be borne by the
Company;  provided,  however,  that  (A) any  incremental  filing  fees or other
expenses  incurred  by the  Company  solely by reason of  Holder's  exercise  of
registration  rights  pursuant  to  Section  11(a),  and  (B)  any  underwriting
discounts  and  commissions  payable in  connection  with  Holder's  exercise of
registration rights pursuant to Section 11(a) shall be borne by Holder.

                  (d) The rights conferred upon Holder under this Section 11 may
be  assigned  by Holder  to any  permitted  transferee  of the  Warrant  Shares;
provided that such transfer complies with Section 9 hereof.

                  (e)  In  the  event  any  Warrant  Shares  are  included  in a
registration statement under Section 11(a):

                      (A) To the  extent  permitted  by law,  the  Company  will
indemnify and hold harmless Holder, the partners,  officers, directors and legal
counsel of Holder, any underwriter (as defined in the Securities Act) for Holder
and each  person,  if any, who controls  Holder or such  underwriter  within the
meaning of the Securities Act or the Exchange Act,  against any losses,  claims,
damages,  or  liabilities  (joint or several)  to which they may become  subject
under the  Securities  Act,  the  Exchange  Act or other  federal  or state law,
insofar as such losses,  claims,  damages or liabilities  (or actions in respect
thereof)  arise  out of or are  based  upon  any  of the  following  statements,
omissions or violations  (collectively  a "Violation")  by the Company:  (i) any
untrue  statement or alleged  untrue  statement of a material fact  contained in
such  registration  statement,  including  any  preliminary  prospectus or final
prospectus contained therein or any amendments or supplements thereto,  (ii) the
omission or alleged  omission to state  therein a material  fact  required to be
stated therein,  or necessary to make the statements therein not misleading,  or
(iii) any violation or alleged  violation by the Company of the Securities  Act,
the Exchange Act, any state securities law or any rule or regulation promulgated
under the  Securities  Act,  the  Exchange  Act or any state  securities  law in
connection with the offering  covered by such  registration  statement;  and the
Company will reimburse Holder and each partner, officer or director, underwriter
or  controlling  person for any legal or other expenses  reasonably  incurred by
them in connection with investigating or defending any such loss, claim, damage,
liability or action;  provided,  however, that the indemnity agreement contained
in this Section  11(e)(A)  shall not apply to amounts paid in  settlement of any
such loss,  claim,  damage,  liability or action if such  settlement is effected
without the consent of the  Company,  which  consent  shall not be  unreasonably
withheld,  nor shall the  Company  be liable in any such case for any such loss,
claim,  damage,  liability  or action to the extent  that it arises out of or is
based upon a Violation  which  occurs in reliance  upon and in  conformity  with
written  information  furnished  expressly  for  use  in  connection  with  such
registration  by Holder  or such  partner,  officer,  director,  underwriter  or
controlling person of Holder.

                      (B) To the extent  permitted by law, Holder will indemnify
and hold  harmless the Company,  each of its  directors,  its officers and legal
counsel and each person,  if any, who controls the Company within the meaning of
the Securities  Act, any  underwriter  and any other person  selling  securities
under  such  registration  statement  or any of such  other  person's  partners,
directors or officers or any person who controls such person, against any


                                       11.

<PAGE>


losses,  claims,  damages or liabilities (joint or several) to which the Company
or any such director,  officer,  controlling  person,  underwriter or other such
person, or partner,  director,  officer or controlling person of such person may
become  subject under the  Securities  Act, the Exchange Act or other federal or
state law, insofar as such losses, claims, damages or liabilities (or actions in
respect  thereto) arise out of or are based upon any Violation,  in each case to
the extent (and only to the extent) that such Violation  occurs in reliance upon
and in  conformity  with  written  information  furnished  by  Holder  under  an
instrument  duly  executed  by Holder and stated to be  specifically  for use in
connection with such registration;  and Holder will reimburse any legal or other
expenses  reasonably  incurred  by the  Company or any such  director,  officer,
controlling person,  underwriter or other person, or partner,  officer, director
or controlling  person of such other person in connection with  investigating or
defending any such loss, claim, damage,  liability or action if it is judicially
determined  that  there  was  such a  Violation;  provided,  however,  that  the
indemnity  agreement  contained  in this  Section  11(e)(B)  shall  not apply to
amounts paid in settlement of any such loss, claim, damage,  liability or action
if such  settlement  is effected  without the consent of Holder,  which  consent
shall not be unreasonably withheld; provided further, that in no event shall any
indemnity under this Section  11(e)(B) exceed the net proceeds from the offering
received by such Holder.

                      (C) Promptly after receipt by an  indemnified  party under
this Section 11(e) of notice of the  commencement  of any action  (including any
governmental action), such indemnified party will, if a claim in respect thereof
is to be made against any indemnifying  party under this Section 11(e),  deliver
to the indemnifying  party a written notice of the commencement  thereof and the
indemnifying  party shall have the right to  participate  in, and, to the extent
the indemnifying  party so desires,  jointly with any other  indemnifying  party
similarly  noticed,   to  assume  the  defense  thereof  with  counsel  mutually
satisfactory to the parties; provided,  however, that an indemnified party shall
have the right to retain its own counsel,  with the fees and expenses to be paid
by the indemnifying  party, if  representation  of such indemnified party by the
counsel retained by the indemnifying  party would be inappropriate due to actual
or potential  differing  interests  between such indemnified party and any other
party  represented  by such counsel in such  proceeding.  The failure to deliver
written  notice  to the  indemnifying  party  within  a  reasonable  time of the
commencement  of any such action,  if materially  prejudicial  to its ability to
defend such action,  shall relieve such  indemnifying  party of any liability to
the indemnified  party under this Section 11(e),  but the omission so to deliver
written  notice to the  indemnifying  party will not relieve it of any liability
that it may have to any  indemnified  party  otherwise  than under this  Section
11(e).

                      (D) If the  indemnification  provided  for in this Section
11(e) is held by a court  of  competent  jurisdiction  to be  unavailable  to an
indemnified  party with respect to any losses,  claims,  damages or  liabilities
referred  to  herein,  the  indemnifying  party,  in lieu of  indemnifying  such
indemnified  party  thereunder,  shall to the extent permitted by applicable law
contribute to the amount paid or payable by such  indemnified  party as a result
of such loss, claim, damage or liability in such proportion as is appropriate to
reflect the relative fault of the indemnifying  party on the one hand and of the
indemnified party on the other in connection with the Violation(s) that resulted
in such  loss,  claim,  damage  or  liability,  as well  as any  other  relevant
equitable  considerations.  The relative fault of the indemnifying  party and of
the  indemnified  party shall be  determined  by a court of law by reference to,
among other things,


                                       12.

<PAGE>


whether  the  untrue or  alleged  untrue  statement  of a  material  fact or the
omission  to state a  material  fact  relates  to  information  supplied  by the
indemnifying party or by the indemnified party and the parties' relative intent,
knowledge,  access to  information  and  opportunity  to correct or prevent such
statement  or omission;  provided,  that in no event shall any  contribution  by
Holder hereunder exceed the proceeds from the offering received by Holder.

                      (E) The  obligations  of the Company and Holder under this
Section  11(e) shall  survive  completion  of any  offering of  securities  in a
registration  statement  pursuant to Section 11. No  indemnifying  party, in the
defense of any such claim or litigation,  shall, except with the consent of each
indemnified party, consent to entry of any judgment or enter into any settlement
which  does not  include  as an  unconditional  term  thereof  the giving by the
claimant or plaintiff to such indemnified  party of a release from all liability
in respect to such claim or litigation.

         Section 12. SATURDAYS,  SUNDAYS AND HOLIDAYS.  If the last or appointed
day for the  taking of any action or the  expiration  of any right  required  or
granted  herein  shall be a Saturday or a Sunday or shall be a legal  holiday in
the State of  California,  then such  action  may be taken or such  right may be
exercised on the next succeeding day not a Saturday,  Sunday or legal holiday in
the State of California.

         Section 13. ISSUE TAX. The  issuance of  certificates  for Common Stock
upon the exercise of the Warrant  shall be made without  charge to the holder of
the  Warrant  for any issue tax  (other  than any  applicable  income  taxes) in
respect thereof;  provided,  however,  that the Company shall not be required to
pay any tax which may be  payable in respect  of any  transfer  involved  in the
issuance and delivery of any  certificates in a name other than that of the then
Holder of the Warrant being exercised.

         Section 14. MODIFICATION AND WAIVER.  Neither this Warrant nor any term
hereof  may be  changed,  waived,  discharged  or  terminated  other  than by an
instrument in writing signed by the Company and by Holder.

         Section 15. NOTICES.  Unless otherwise  specified  herein,  any notice,
request or other  document  required or  permitted  to be given or  delivered to
Holder or the Company shall be given in writing and shall be deemed  effectively
given (i) upon  personal  delivery to the party to be  notified,  (ii) three (3)
days after  deposit in the United States mail if sent by registered or certified
mail,  postage  prepaid,  or (iii) one (1) day after  deposit  with an overnight
courier, specifying next day delivery, with written verification of receipt. All
communications  shall be sent to Holder at its  address as shown on the books of
the Company,  or to the Company at the address  indicated  therefor in the first
paragraph of this Warrant.

         Section 16.  DESCRIPTIVE  HEADINGS AND GOVERNING  LAW. The  descriptive
headings of the several sections and paragraphs of this Warrant are inserted for
convenience  only and do not  constitute  a part of this  Warrant.  This Warrant
shall be  construed  and  enforced  in  accordance  with,  and the rights of the
parties  shall be  governed  by,  the laws of the State of  California,  without
regard to its conflicts of laws principles.


                                       13.

<PAGE>


         Section 17.  ATTORNEYS'  FEES. In any litigation,  arbitration or court
proceeding  between the Company and Holder relating hereto, the prevailing party
shall be entitled to attorneys'  fees and expenses and all costs of  proceedings
incurred in enforcing this Warrant.

         Section 18. SURVIVAL.  The representations,  warranties,  covenants and
conditions of the respective  parties  contained herein or made pursuant to this
Warrant shall survive the execution and delivery of this Warrant.

         Section  19.  SEVERABILITY.  In  the  event  any  one  or  more  of the
provisions  of this  Warrant  shall for any reason be held  invalid,  illegal or
unenforceable, the remaining provisions of this Warrant shall be unimpaired, and
the invalid,  illegal or unenforceable provision shall be replaced by a mutually
acceptable valid,  legal and enforceable  provision,  which comes closest to the
intention  of the  parties  underlying  the  invalid,  illegal or  unenforceable
provision.

         Section 20. NO  IMPAIRMENT.  The Company  will not, by amendment of its
charter or through reorganization,  consolidation,  merger, dissolution, sale of
assets or any other voluntary  action,  avoid or seek to avoid the observance or
performance  of any of the terms of this Warrant,  but will at all times in good
faith assist in the carrying out of all such terms and in the taking of all such
action as may be necessary or  appropriate in order to protect the rights of the
holder of this Warrant against impairment.

         Section 21.  COMPANY  INFORMATION.  Notwithstanding  the  provisions of
Section 5  hereof,  as a  courtesy  to  Holder  and to  assist  Holder in making
informed decisions regarding the possible exercise of this Warrant,  the Company
agrees to provide to Holder from time to time, upon written request by Holder to
the chief financial officer of the Company from time to time (but not more often
than twice in any  calendar  year),  copies of (a) the  Company's  Form 10-K and
annual report most recently filed with the  Securities and Exchange  Commission,
(b) any Form  10-Qs or  other  interim  reports  filed by the  Company  with the
Securities and Exchange  Commission  since the end of the period covered by such
Form 10-K and  annual  report,  and (c) any proxy  statements,  reports or other
notices  distributed to holders of the Company's  Common Stock within the twelve
(12) months  preceding  such  request (or within the period  since the last such
request by Holder, whichever is shorter).


                                       14.

<PAGE>


         IN WITNESS  WHEREOF,  the Company  has duly  caused this  Warrant to be
signed by its duly authorized officer and to be dated as of June 30, 1997.


                                            Company:

                                            SUGEN, INC.


                                            By:
                                               ---------------------------------
                                                     Stephen Evans-Freke
                                                     Chief Executive Officer


                                            Holder:

                                            SDK INCORPORATED



                                            By:
                                               ---------------------------------
                                            Name:
                                                 -------------------------------
                                            Title:
                                                  ------------------------------


                                       15.

<PAGE>


                                  PURCHASE FORM


                                                       Dated ___________, 19____


         The  undersigned  hereby  irrevocably  elects to  exercise  the  within
Warrant to purchase  ______  shares of Common Stock and hereby makes  payment of
$_____________  in payment of the  exercise  price  thereof,  together  with all
applicable transfer taxes, if any.

         In exercising  its rights to purchase the Common Stock of SUGEN,  Inc.,
the undersigned hereby confirms and acknowledges the investment  representations
and warranties made in Section 10 of the Warrant.

         Please issue a certificate or certificates  representing said shares of
Common  Stock  in the  name  of the  undersigned  or in  such  other  name as is
specified below.



                                            ------------------------------------
                                            (Name)

                                            ------------------------------------
                                            (Address)


                                            Holder:

                                            SDK INCORPORATED


                                            By:
                                                --------------------------------
                                            Name:
                                                 -------------------------------
                                            Title:
                                                  ------------------------------


<PAGE>


                                 ASSIGNMENT FORM


                                                          Dated _________, _____



         FOR  VALUE  RECEIVED,   SDK  Incorporated  hereby  sells,  assigns  and
transfers unto _______________________________________________ (the "Assignee"),
                   (please type or print in block letters)
________________________________________________________________________________
                                (insert address)
its right to purchase up to _______  shares of Common Stock  represented by this
Warrant    and    does    hereby    irrevocably     constitute    and    appoint
____________________________  attorney, to transfer the same on the books of the
Company, with full power of substitution in the premises.


                                            SDK INCOPORATED


                                            By:
                                                --------------------------------
                                            Name:
                                                 -------------------------------
                                            Title:
                                                  ------------------------------


<PAGE>



                                 TRANSFER NOTICE


        (To  transfer or assign the  foregoing  Warrant,  execute  this form and
        supply required information. Do not use this form to purchase shares.)

        FOR VALUE  RECEIVED,  the  foregoing  Warrant  and all rights  evidenced
thereby are hereby transferred and assigned to:

________________________________________________________________________________
                                 (Please Print)
whose address is _______________________________________________________________

________________________________________________________________________________


                                            Dated_______________________________

                                            Holder's Signature__________________

                                            Holder's Address____________________

                                            ____________________________________




Note:        The signature to this Transfer Notice must correspond with the name
             as it appears on the face of the  Warrant,  without  alteration  or
             enlargement or any change  whatever.  Officers of corporations  and
             those acting in a fiduciary or other representative capacity should
             file proper evidence of authority to assign the foregoing Warrant.




                                                                   EXHIBIT 10.65

                                            ***TEXT OMITTED AND FILED SEPARATELY
                                                CONFIDENTIAL TREATMENT REQUESTED
                                            UNDER 17 C.F.R. SS.SS. 200.80(B)(4),
                                                            200.83 AND 240.24B-2



                           SECOND AMENDED AND RESTATED

                                    NYU/SUGEN

                         RESEARCH AND LICENSE AGREEMENT



<PAGE>



                                TABLE OF CONTENTS


                                                                            Page
 
SECTION 1.   DEFINITIONS.....................................................  1

SECTION 2.   EFFECTIVE DATE..................................................  4

SECTION 3.   PERFORMANCE OF THE NYU RESEARCH PROJECT.........................  4

SECTION 4.   FUNDING OF THE NYU RESEARCH PROJECT.............................  5

SECTION 5.   TITLE...........................................................  6

SECTION 6.   PATENTS AND PATENT APPLICATIONS.................................  6

SECTION 7.   GRANT OF LICENSE................................................  8

SECTION 8.   PAYMENTS FOR LICENSE............................................  9

SECTION 9.   SUGEN OWNERSHIP CHANGE.......................................... 10

SECTION 10.  METHOD OF PAYMENT. ............................................. 11

SECTION 11.  DEVELOPMENT AND COMMERCIALIZATION............................... 11

SECTION 12.  CONFIDENTIAL INFORMATION........................................ 13

SECTION 13.  PUBLICATION..................................................... 13

SECTION 14.  INFRINGEMENT OF NYU PATENT...................................... 14

SECTION 15.  LIABILITY AND INDEMNIFICATION................................... 15

SECTION 16.  SECURITY FOR INDEMNIFICATION.................................... 16

SECTION 17.  EXPIRY AND TERMINATION.......................................... 17

SECTION 18.  REPRESENTATIONS BY SUGEN AND NYU................................ 18


                                       i.

<PAGE>


SECTION 19.  ASSIGNMENT...................................................... 19

SECTION 20.  USE OF NAME..................................................... 19

SECTION 21.  MISCELLANEOUS................................................... 20


                                       ii.

<PAGE>


                           SECOND AMENDED AND RESTATED
                                    NYU/SUGEN
                         RESEARCH AND LICENSE AGREEMENT


         This  Agreement,  effective  as of  September  1, 1991 ("the  Effective
Date"), is by and between:

         NEW YORK  UNIVERSITY,  a corporation  organized and existing  under the
laws of the  State of New York  ("NYU")  and  having a place of  business  at 70
Washington Square South, New York, New York 10012; and

         SUGEN, INC., a corporation organized and existing under the laws of the
State of Delaware  ("SUGEN")  and having its  principal  office at 515 Galveston
Drive, Redwood City, California 94063-4720.

                                    RECITALS

         WHEREAS,  Dr. Joseph Schlessinger of NYU (the "NYU Scientist") has made
certain inventions (the "Pre-Existing Inventions") with respect to Receptors (as
hereinafter defined), including those listed in Appendix I.

         WHEREAS, NYU is willing to perform the NYU Research Project;

         WHEREAS, subject to the terms and conditions hereinafter set forth, NYU
is willing to grant to SUGEN and SUGEN is willing to accept from NYU the License
(as hereinafter defined); and

         WHEREAS,  NYU and SUGEN  have  heretofore  entered  into the  NYU/SUGEN
Research and License Agreement, which became effective on September 1, 1991 (the
"Original  Agreement"),  and the Amended and  Restated  NYU/SUGEN  Research  and
License Agreement effective in November 1993 (the "Amended  Agreement") and each
of them  desires  to amend  and  restate  the  Original  Agreement  and  Amended
Agreement in their entireties,

         NOW, THEREFORE,  in consideration of the mutual promises and agreements
contained herein, the parties hereto hereby agree as follows:

SECTION 1.  DEFINITIONS.

         Whenever used in this  Agreement,  the  following  terms shall have the
following meanings:

         (a) "Calendar Year" shall mean any consecutive  period of twelve months
commencing on the first day of January of any year.

         (b)  "Corporation  Entity" shall mean any company or other legal entity
which  controls,  or is controlled by, or is under common  control with,  SUGEN;
"control" means the


                                       1.

<PAGE>



holding of more than 50% of (i) the capital and/or (ii) the voting rights and/or
(iii) the right to elect or appoint directors.

         (c) "Date of First  Commercial  Sale"  shall mean the date on which the
first  arms-length  commercial  sale of a SUGEN  Product is made on a product by
product and country by country basis.

         (d)  "Force  Majeure"  shall  mean  any  occurrence  that  prevents  or
substantially  interferes  with  the  performance  by a  party  of  any  of  its
obligations hereunder,  if such occurs by reason of any act of God, flood, fire,
explosion,  breakdown  of  plant,  strike,  lockout,  labor  dispute,  casualty,
accident, war, revolution,  civil commotion,  acts of public enemies,  blockage,
embargo, injunction, law, order, proclamation,  regulation, ordinance, demand or
requirement of any government or of any subdivision, authority or representative
of any such government, inability to procure or use materials, labor, equipment,
transportation  or energy  sufficient  to meet  manufacturing  needs without the
necessity  of  allocation,  or any other cause  whatsoever,  whether  similar or
dissimilar  to those above  enumerated,  beyond the  reasonable  control of such
party, if and only if the party affected shall have used  reasonable  efforts to
avoid such occurrence and to remedy it promptly if it shall have occurred.

         (e) "License"  shall mean the exclusive  worldwide  license to practice
the Research Technology (as hereinafter defined) for the research,  development,
manufacture, use and sale of SUGEN Products (as hereinafter defined).

         (f) "License  Revenues"  shall mean [...*...]  provided  that,  License
Revenues shall not include any such payments made by any  Corporation  Entity or
SUGEN to SUGEN or any other Corporation Entity.

         (g) "Net Sales" shall mean the total amount  [...*...]  after deduction
of all the following to the extent applicable to such sale:

                  (i) all trade, case and quantity credits discounts, refunds or
rebates, including government rebates;

                  (ii) all amounts of insurance and freight expenses included in
such invoice;

                  (iii) all allowances or credits for returns;

                  (iv) all sales commissions; and

                  (v) all sales taxes (including value added taxes);

provided, that, in respect of any sale that [...*...],  after the aforementioned
deductions.

         (h) "MPG" shall mean  Max-Planck-1  Institut fur  Biochemie,  Abteilung
Molekularbiologie (Director: Prof. Dr. Axel Ullrich), located in Am Klopferspitz
18a, W-8003


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* CONFIDENTIAL TREATMENT REQUESTED
                                       2.

<PAGE>



Martinsreid,  an  institute of the  Max-Planck-Gesellschaft  zur  Forderung  der
Wissenschaften  e.V.,  located in  Residenzstrasse  1a, W-8000 Munchen 2, or any
scientist affiliated with Max-Planck-1  Institut fur Biochemie,  and/or Garching
Intrumente  Gesellschaft  zur  industriellen  Nutzung von  Forschungsergebnissen
m.b.h. located in Koniginstrabe 19, W-8000 Munchen 22.

         (i) "NYU  Know-How"  shall  mean the  Pre-Existing  Inventions  and any
information  and  materials  (including,  but not  limited  to,  pharmaceutical,
chemical,  biological  and  biochemical  products,  information,  trade secrets,
know-how, technical and non-technical data, materials, methods and processes and
any drawings, plans, diagrams,  specifications and/or other documents containing
such  information)  [...*...].  For the avoidance of doubt,  NYU Know-How  shall
include any of the foregoing that are developed [...*...].

         (j) "NYU  Patents"  shall  mean NYU's  share in all  United  States and
foreign patents and patent applications,  and any divisions,  continuations,  in
whole or in  part,  reissues,  renewals  and  extensions  thereof,  and  pending
applications therefor:

                    (x) which  claim  Pre-Existing   Inventions  and  which  are
                        identified on Appendix I hereto; or

                    (y) which  claim  inventions  that are made,  in whole or in
                        part, [...*...]. For the avoidance of doubt, NYU Patents
                        shall  include  any  such   inventions   that  are  made
                        [...*...].

         (k) "NYU Research  Project"  shall mean the  investigations  during the
Research  Period into the field of the Receptors  under the direction of the NYU
Scientist which are funded by SUGEN and include the research programs  described
in Appendix II hereto which forms an integral part hereof.

         (l) "Patentable  Invention" shall mean a claim in an issued,  unexpired
patent  that has not been held  invalid by any final  decision of a court in the
relevant  country.  It also includes  claims in a pending  application  that has
priority from a specification filed less than seven years previous.

         (m)   "Receptor" shall mean:

                   (i)   [...*...] and/or

                   (ii)  [...*...] and/or

                   (iii) [...*...]and/or

                   (iv)  [...*...] of the above receptors.



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* CONFIDENTIAL TREATMENT REQUESTED
                                       3.

<PAGE>



         (n) "Research  Period" shall mean the ten year period commencing on the
Effective Date hereof and any extension  thereof as to which NYU and SUGEN shall
mutually agree in writing.

         (o) "Research Technology" shall mean all NYU Patents and NYU Know-How.

         (p) "Sublicensee"  shall mean an entity licensed by SUGEN or a licensee
of SUGEN to develop, make, distribute or sell a SUGEN Product.

         (q) "SUGEN Product" shall mean any product for the diagnosis, treatment
or prevention of human disease which contains or comprises:

              (i)   any Receptor (as hereinafter defined); and/or

              (ii)  any substance which [...*...] and/or

              (iii) any substance [...*...] and/or

              (iv)  any substance [...*...] and/or

              (v)   [...*...]

provided that an  Investigational  New Drug (IND)  application is filed for such
SUGEN Product within 4 years from the end of the Research Period.  SUGEN Product
shall not include any product that is licensed by SUGEN from a third party other
than MPG,  provided  that such  product  does not act by  [...*...]  a Validated
Target.

         (r) "Validated Target" shall mean a Receptor target that has been shown
to be correlated with a particular disease in which a small molecule therapeutic
would offer a reasonable commercial opportunity,  and where inhibition of target
function  in in vitro  and in vivo  models  leads  to  effective  inhibition  of
pathophysiology.

SECTION 2.  EFFECTIVE DATE.

         This  Agreement  shall be effective as of the Effective  Date and shall
remain in full force and effect until it expires or is  terminated in accordance
with Section 17 hereof.

SECTION 3.  PERFORMANCE OF THE NYU RESEARCH PROJECT.

         (a) In  consideration  of the  sums to be paid to NYU as set  forth  in
Section 4 below,  NYU  undertakes to perform the NYU Research  Project under the
leadership  of the NYU  Scientist  during the Research  Period.  If,  during the
Research Period, the NYU Scientist shall cease to lead the NYU Research Project,
then NYU shall  promptly so notify  SUGEN and shall  endeavor to find from among
the scientists employed by NYU a scientist or scientists acceptable

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* CONFIDENTIAL TREATMENT REQUESTED
                                       4.


<PAGE>


to SUGEN to continue the leadership of the NYU Research  Project in place of the
NYU  Scientist.  If NYU is unable to find such a scientist  acceptable  to SUGEN
[...*...]  the NYU  Research  Project may be  terminated  by SUGEN upon  written
notice to NYU, in which case SUGEN shall have no further  obligation to fund the
NYU Research Project and NYU shall have no further obligation to perform the NYU
Research  Project.  Such  termination  of  funding of the NYU  Research  Project
pursuant to this Section 3(a) shall not terminate  this Agreement or the License
granted herein. [...*...].

         (b)  Nothing  contained  in this  Agreement  shall  be  construed  as a
warranty on the part of NYU that any results or  inventions  will be achieved by
the NYU  Research  Project  or that the  Research  Technology  and/or  any other
results or inventions  achieved by the NYU Research Project, if any, are or will
be commercially exploitable and, furthermore, NYU makes no warranties whatsoever
as to the commercial or scientific value of the Research  Technology  and/or any
results which may be achieved by the NYU Research Project.

         (c) Within  sixty (60) days after the end of each  six-month  period of
each  year  during  the  Research  Period,  NYU shall  prepare a written  report
summarizing the results of the work conducted on the NYU Research Project during
such  preceding  six-month  period.  Within sixty (60) days of the date on which
such  report is due to SUGEN,  SUGEN  and NYU  shall  hold a meeting  at the NYU
research  facility,  or such other site as the parties may agree,  to review the
written  report in the  format of a  scientific  exchange.  Such  meeting  shall
include the NYU Scientist.

         (d)  NYU  will  have  full  authority  and  responsibility  for the NYU
Research Project. All students and employees of NYU who work on the NYU Research
Project  will do so as  employees  or students of NYU,  and not as  employees or
consultants of SUGEN.

SECTION 4.  FUNDING OF THE NYU RESEARCH PROJECT.

         (a) In addition to prior payments to NYU, as  compensation  for work to
be performed on the NYU Research Project during the Research Period,  subject to
any earlier termination of the Research Project pursuant to Section 3(a) hereof,
SUGEN will pay NYU the following amounts for the remaining years of the Research
Period,  after  execution  of this  Second  Amended  Agreement,  for a total  of
[...*...]:

         Seventh Year               [...*...]
         Eighth Year                [...*...]
         Ninth Year                 [...*...]
         Tenth Year                 [...*...]


such payments  shall be paid  according to the Schedule of Payments set forth in
Appendix III, which is an integral part of this Agreement.



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* CONFIDENTIAL TREATMENT REQUESTED
                                       5.

<PAGE>


         (b) Charges with respect to the NYU Research  Project  shall be made in
accordance  with NYU's then  prevailing  policies  and  procedures  for charging
research  expenditures  to individual  research  projects.  NYU shall deliver to
SUGEN,  [...*...] a report setting out the income and disbursements received and
expended in connection with the NYU Research Project during such year.

         (c) SUGEN shall have the annual right (at its own expense) to meet with
the NYU Scientist and review expenditures by NYU in connection with the Research
Project during such year.

         (d) NYU shall  not,  without  SUGEN's  prior  written  consent,  permit
funding  other than  provided by SUGEN to be spent on the NYU Research  Project;
provided that,  nothing in this  Agreement  shall be interpreted to prohibit NYU
(or the NYU Scientist)  from obtaining  additional  financing or research grants
for the NYU  Research  Project  from  not-for-profit  entities or United  States
government agencies, which grants or financing may render all or part of the NYU
Research  Project or the  results  thereof  subject to the patent  rights of the
United States  government and its agencies,  as set forth in Title 35 U.S.C. ss.
200 et seq,  provided  that such  funding is not  subject to rights to any other
third party.

SECTION 5. TITLE.

         (a) Subject to the  License  granted to SUGEN  hereunder,  it is hereby
agreed  that all right,  title and  interest in and to the  Research  Technology
shall vest  solely in NYU except to the extent  that any  technology  is jointly
developed  by SUGEN and NYU, in which  case,  such  technology  shall be jointly
owned.

         (b) SUGEN  acknowledges  that,  subject to the License granted to SUGEN
hereunder,  for  so  long  as Dr.  Joseph  Schlessinger  (or  any  scientist  or
researcher  working on the NYU Research Project) is employed by NYU, any and all
inventions  made by Dr.  Schlessinger  (or such other  scientist or  researcher)
shall be owned solely by NYU.

SECTION 6.  PATENTS AND PATENT APPLICATIONS.

         (a) NYU will promptly  disclose to SUGEN in writing any inventions made
during the Research  Period and in the course of performance of the NYU Research
Project pertaining to the Research Technology which may constitute the basis for
potential NYU Patents.  NYU will fully  cooperate with SUGEN to ensure that such
inventions are promptly disclosed,  and will make the scientists which made such
inventions  available for consultation to attorneys for SUGEN and NYU to achieve
this.

         (b) At the  initiative  of SUGEN or NYU, the parties shall consult with
each  other  regarding  the  filing of patent  applications  in  respect  of any
inventions pertaining to the Research Technology,  including without limitation,
the timing of the filing of such  applications,  the  jurisdiction  within which
foreign counterparts of such applications should be filed and other




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* CONFIDENTIAL TREATMENT REQUESTED
                                       6.

<PAGE>



details  pertaining  to  the  prosecution  and  maintenance  of  patent  rights.
Notwithstanding the foregoing, the parties agree that:

                   (i) if  SUGEN  and NYU  disagree  at any time  regarding  the
filing of any patent application in respect of any such invention  pertaining to
the Research Technology,  upon the delivery of written instructions to the other
party  from the party who  desires  to file such  application,  the party who so
desires to file such  application  may proceed to file such  application and the
other party shall fully  cooperate,  and shall  instruct their patent counsel to
cooperate,  in all matters to ensure that such application may be properly filed
on a timely basis;

                   (ii) neither party may abandon the prosecution or maintenance
of any such patent  application  without the prior written  consent of the other
party; and

                   (iii) NYU shall act with respect to the filing of any foreign
counterpart of any such patent  application  only on and in conformity  with the
written instructions of SUGEN.

         (c) Patent  applications  on any inventions  pertaining to the Research
Technology shall be filed, prosecuted and maintained by [...*...]. Copies of all
such patent applications and patent office actions shall be forwarded to each of
NYU and SUGEN.  [...*...] shall have the right, at its own expense, to have such
patent  applications and patent office actions  independently  reviewed by other
patent  counsel  separately  retained by it, upon prior notice to and consent of
[...*...], which consent shall not unreasonably be withheld.

         (d) NYU and SUGEN shall assist,  and cause their  respective  employees
and consultants to assist each other, in assembling inventorship information and
data for the  filing  and  prosecution  of  patent  applications  on  inventions
pertaining to the Research Technology.

         (e) All NYU Patents shall be filed,  prosecuted  and  maintained at the
expense  of SUGEN;  provided,  that,  with  respect  to the  filing of those NYU
Patents with which SUGEN disagreed, pursuant to Section 6(c)(i) hereof, such NYU
Patents shall be filed,  prosecuted  and maintained at the expense of NYU. SUGEN
shall pay  [...*...]  directly  for all costs  and fees in  connection  with the
preparation,  filing, maintenance,  prosecution,  protection and the like of the
NYU Patents,  except such costs and fees incurred in  connection  with those NYU
Patents referred to in the proviso in the immediately preceding sentence,  which
shall be paid by NYU.

         (f) Nothing  herein  contained  shall be deemed to be a warranty by NYU
that (i) NYU can or will be able to obtain  any  patent or patents on any patent
application or applications in the NYU Patents or any portion  thereof,  or that
any  of  the  NYU  Patents  will  afford  adequate  or  commercially  worthwhile
protection, or (ii) the manufacture,  use or sale of any element of the Research
Technology or any SUGEN Product will not infringe any patent of any third party.



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* CONFIDENTIAL TREATMENT REQUESTED
                                       7.

<PAGE>



SECTION 7.  GRANT OF LICENSE.

         (a)  Subject to the terms and  conditions  hereinafter  set forth,  NYU
hereby grants to SUGEN and SUGEN hereby accepts from NYU the License.

         (b) With respect to each SUGEN Product,  the royalty  obligations under
this  Agreement  for the License  granted to SUGEN in Section  7(a) hereto shall
remain in force on a country by country basis  beginning  from the Date of First
Commercial  Sale of such SUGEN Product in a country until the expiration date of
the  last to  expire  of an NYU  Patent  or any  patent  claiming  a  Patentable
Invention  licensed to or owned by SUGEN  relating to the SUGEN  Product in such
country,  or 15 years,  whichever  shall be earlier.  SUGEN shall  inform NYU in
writing of the Date of First  Commercial Sale with respect to each SUGEN Product
in each  country  as soon as  practicable  after the  making of each such  first
commercial  sale.  Upon  expiration  of such  period  with  respect to any SUGEN
Product in any  country as  provided in this  Section  7(b),  SUGEN shall have a
fully  paid up license to make,  have made,  use and sell such SUGEN  Product in
such country.

         (c) SUGEN shall be entitled to grant  sublicenses  under the License on
terms  and  conditions  in  compliance  with the terms  and  conditions  of this
Agreement (except that the rate of royalty may be at higher rates than those set
forth in this  Agreement)  (i) to a  Corporation  Entity or (ii) to other  third
parties [...*...], subject to the following conditions:

                  (i) All  sublicenses  shall  only  be  granted  under  written
agreements. SUGEN shall notify NYU of all relevant sublicense agreements as soon
as practicable after the signing thereof,  and upon written request by NYU shall
provide  copies  of such  agreements  to NYU under an  agreement  in the form of
Appendix IV.

                  (ii) Each sublicense granted hereunder shall be [...*...];

                  (iii)  Subject to the last  sentence of this  clause (c),  the
sublicense shall expire automatically on the termination of the License;

                  (iv) Any  Sublicensee  or any  Corporation  Entity  may  grant
further sublicenses for the development,  manufacture, use, sale or distribution
of SUGEN Products;

                  (v) Both during the term of the  sublicense and thereafter the
Sublicensee  shall be  bound by a  confidentiality  obligation  similar  to that
imposed on SUGEN in Section 11 below;

                  (vi) Any  sublicense  agreement  shall  include an  equivalent
obligation of the Sublicensee  thereunder to SUGEN's  obligations under Sections
14 and 15 hereof and shall state that NYU is an intended third party beneficiary
of such sublicense  agreement for the purpose of enforcing such  indemnification
and insurance provisions;




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* CONFIDENTIAL TREATMENT REQUESTED
                                       8.

<PAGE>



                  (vii) If further  sublicensing  is permitted  thereunder,  the
sublicense  shall require the Sublicensee  thereunder to give notice to SUGEN in
writing  promptly  after  the  grant  by  any  such  Sublicensee  of  a  further
sublicense. SUGEN shall give written notice to NYU promptly after the receipt of
any such notice from any Sublicensee.

In the event that the License is  terminated,  any  sublicense  granted by SUGEN
under the License and any further sublicenses thereunder shall, [...*...] remain
in full force and effect,  provided that such  Sublicensee is not then in breach
of its sublicense agreement and [...*...] under the terms and conditions of such
sublicense agreement.

SECTION 8.  PAYMENTS FOR LICENSE.

         (a) NYU acknowledges  that SUGEN has a fully paid up and  non-exclusive
license  to all  NYU  Know-How  related  to the  use or  development  of a SUGEN
Product, but excluding Pre-Existing Inventions, in consideration of payments for
the Research  Program as described in Section 4 herein.  NYU  acknowledges  that
SUGEN  retains all rights to the License that  accumulated  since the  Effective
Date up to [...*...], including those rights granted in Section 7 of the Amended
Agreement.

         (b) In  consideration  for the grant and  during the term  provided  in
Section 7(b) with respect to each SUGEN Product SUGEN shall pay to NYU:

                  (i) a royalty  of  [...*...]  of the Net Sales of SUGEN or any
Corporation Entity; and

                  (ii) a portion of License Revenues determined as follows:

                           (A) [...*...] of License Revenues with respect to any
SUGEN Product; or

                           (B) [...*...] of License Revenues with respect to any
SUGEN Product that is covered under SUGEN's  agreements with [...*...],  and any
extensions,  modifications,  or revisions thereof, provided that with respect to
amounts paid to NYU for royalties such amounts shall not exceed [...*...] of the
Sublicensee's Net Sales in any period;

         (c) For the purpose of computing the  royalties  due to NYU  hereunder,
the year shall be divided into two parts ending on [...*...].  SUGEN shall,  not
later than [...*...]  after each June [...*...] in each Calendar Year during the
term of the License,  submit to NYU a full and  detailed  report of royalties or
payments due NYU under the terms of this  Agreement for the preceding  half year
(hereinafter  "the  Half-Year  Report"),  setting  forth the Net sales,  License
Revenues and all other payments due to NYU hereunder, including at least:

                  (i) the quantity of Licensed Products sold;



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* CONFIDENTIAL TREATMENT REQUESTED
                                       9.

<PAGE>


                  (ii) the selling price of each SUGEN Product sold;

                  (iii) the  deductions  permitted  under Section 1(g) hereof to
arrive at Net Sales; and

                  (iv) the royalty computations and subject of payment.

         If no royalties or other payments are due, a statement shall be sent to
NYU  stating  such fact.  Payment of the full amount of any  royalties  or other
payments  due to NYU for the  preceding  half  year  shall  accompany  each such
Half-Year Report.

         (d) SUGEN  shall  maintain,  and shall  require  all  Sublicensees  and
Corporation  Entities to maintain for a period of two years after the end of the
Calendar  year to  which  they  relate,  true  and  complete  books  of  account
consistent with standard  accounting  practice  containing an accurate record of
all data  necessary for the proper  computation of all payments due to NYU under
the terms of this  Agreement and NYU shall have the right,  through a nationally
recognized  independent certified public accountant,  to examine such books (not
more than once in each calendar Year) within two Calendar Years after the end of
the  Calendar  Year to which they  relate  for the  purpose  of  verifying  such
payments.  Any such examination shall be made during normal business hours where
the records are regularly kept. NYU agrees that the information  furnished to it
as a result of any such  examination  shall be  limited to a  statement  by such
certified public  accountant to the effect that they have reviewed such books of
account  and that the  amounts  of the  payments  due  under  the  terms of this
Agreement  are in  conformity  with such  books of  account  and the  applicable
provisions of this  Agreement,  or setting forth any required  adjustments.  The
fees and expenses of such examination shall be borne by NYU; provided,  however,
that if such examination  reveals an underpayment of more than [...*...] for any
period, SUGEN shall promptly reimburse NYU for such fees and expenses.  Any such
accountants  shall  be  required  to keep  all  information  derived  from  such
examination confidential.

SECTION 9.  SUGEN OWNERSHIP CHANGE

         In the event that SUGEN is acquired or merged with another company,  or
that SUGEN  acquires or forms a joint venture with another  company,  then SUGEN
may  at its  option  notify  NYU  that  such  other  company  wishes  to  make a
determination  as to which  targets  shall be  included  under  the terms of the
Agreement prior to the effective date of any such acquisition,  merger, or joint
venture, or as soon as possible thereafter.  This determination shall be made in
good faith by NYU and SUGEN and shall be based on an  examination of SUGEN's lab
books and  other  information  available  to the  parties,  full  access  (under
appropriate  confidentiality  agreements) to which will be provided to NYU. With
respect to targets that were adopted by SUGEN into drug  discovery  prior to the
effective date of the  acquisition,  merger,  or joint  venture,  SUGEN Products
developed  based  on such  targets  shall be  subject  to the  license  payments
described  in  Section 8 hereto.  SUGEN  Products  that are  developed  based on
Receptor  targets which were not adopted into drug  discovery at the time of the
effective date of such acquisition, merger, or joint venture shall be subject to
a). a royalty of [...*...] on Net Sales


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* CONFIDENTIAL TREATMENT REQUESTED
                                       10.

<PAGE>



of SUGEN,  and/or  Corporation  Entity,  which may be offset by [...*...] of the
royalties  paid by SUGEN to third  parties  (other than MPG),  provided that the
royalties due to NYU shall not be less than  [...*...] of Net Sales of SUGEN and
/or Corporation Entity and b). [...*...] of License Revenues with respect to any
SUGEN  Product,  provided that with respect to such SUGEN Product there exists a
Patentable  Invention  with respect to such target  and/or its utility  which is
derived from or based on the Research Technology, and provided further that such
SUGEN Product shall include a product irrespective of whether an IND application
is  filed  with  respect  thereto  within 4 years  from the end of the  Research
Period, or not.

SECTION 10.  METHOD OF PAYMENT.

         (a) Royalties and any other payments due to NYU hereunder shall be paid
to NYU in  United  States  dollars.  Any such  royalties  on or  other  payments
relating to  transactions  in a foreign  currency shall be converted into United
States  dollars based on the closing  buying rate of the Morgan  Guaranty  Trust
Company of New York  applicable to transactions  under exchange  regulations for
the particular  currency on the last business day of the  accounting  period for
which such royalty or other payment is due.

         (b) SUGEN shall be  responsible  for  payment to NYU of all  royalties,
License Revenues and all other payments due to NYU under this Agreement on sale,
transfer or  disposition of SUGEN  Products by any  Corporation  Entity of SUGEN
under the  License.  SUGEN  shall use its best  efforts to collect  all  License
Revenues due to NYU under this agreement from Sublicensees.

SECTION 11.  DEVELOPMENT AND COMMERCIALIZATION.

         (a) In the event a Validated  Target is  identified  directly by NYU in
the  course  of the NYU  Research  Project  and i).  the  Validated  Target is a
Receptor  target  validated by NYU after the effective date of this amendment to
the Amended  Agreement  ii).  the  Validated  Target is covered by a  Patentable
Invention in an NYU Patent and iii).  the  necessary  reagents are  available to
NYU,  in which  case  they will be made  available  to  SUGEN,  SUGEN  shall use
reasonable  diligence  consistent with prudent commercial practices to [...*...]
of receiving  the  Validated  Target and all reagents from NYU. If the Validated
Target is not [...*...],  SUGEN shall initiate an outlicensing effort to find an
appropriate  commercial  partner.  If the Validated  Target is not i). [...*...]
period or ii).  [...*...]  area by SUGEN or iii).  [...*...] then NYU shall have
the right upon written  notice to SUGEN to  terminate  the License in respect of
the Validated Target. If at any point prior to the termination of the License in
respect of a Validated  Target SUGEN shall  validate the Validated  Target in an
additional  disease or  therapeutic  area,  then SUGEN shall have an  additional
[...*...]  period to initiate  [...*...] and an additional  [...*...]  period to
outlicense.  In the event that NYU shall  terminate  the License in respect of a
Validated Target as aforesaid,  and notwithstanding  anything to the contrary in
Section  17(d),  all rights in and to the Research  Technology  relating to such
Validated  Target  shall  revert to NYU and SUGEN shall not make any further use
thereof  (except to the extent that a third party is free to use them  without a
license from NYU).


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* CONFIDENTIAL TREATMENT REQUESTED
                                       11.

<PAGE>


         (b) SUGEN or its Sublicensees shall use reasonable diligence consistent
with prudent  commercial  practices to carry out all  developmental  activities,
including but not limited to,  [...*...].  SUGEN or its  Sublicensees  shall use
reasonable  diligence consistent with prudent commercial practices to obtain the
appropriate approvals of the health authorities for the production, use and sale
of the SUGEN Products in each of the other countries of the world in which SUGEN
or its Sublicensees under the License intend to produce,  use, and/or sell SUGEN
Products.

         (c) Provided that applicable laws,  rules and regulations  require that
the performance of the tests, trials,  studies and other activities specified in
subsection (a) above shall be carried out in accordance with FDA Good Laboratory
Practices and in a manner acceptable to the relevant foreign health authorities,
SUGEN or its Sublicensees shall carry out such tests, trials,  studies and other
activities  in  accordance  with FDA Good  Laboratory  Practices and in a manner
acceptable to the relevant foreign health  authorities.  Furthermore,  the SUGEN
Products shall be produced in accordance  with FDA Good  Manufacturing  Practice
procedures  ("GMP")  in a  facility  which  has  been  certified  by the  FDA as
complying with GMP,  provided that  applicable  laws,  rules and  regulations so
require.

         (d) SUGEN  shall have the right,  but not the  obligation,  in its sole
discretion,  to select one or more SUGEN Products for  commercialization.  SUGEN
shall advise NYU in writing  promptly of each SUGEN  Product so selected.  SUGEN
undertakes,  or shall  cause  its  Sublicensees  to agree to  undertake,  to use
reasonable  diligence consistent with prudent commercial practices [...*...] for
SUGEN,  the  commercialization  of those  SUGEN  Products  selected by SUGEN for
commercialization.

         (e) SUGEN  shall  provide  NYU with  written  reports  on all  material
activities  and actions  undertaken  by SUGEN to develop and  commercialize  the
SUGEN  Products;  such  reports  shall be made,  during the royalty  term of the
License  with  respect  to such  SUGEN  Product as  provided  in  Section  7(b),
[...*...]. Promptly after filing of an IND application with respect to any SUGEN
Product, SUGEN shall notify NYU in writing of such filing.

         (f) If SUGEN fails to use reasonable  diligence consistent with prudent
commercial  practices either to [...*...] or thereafter to [...*...],  unless in
either case such delay is  necessitated by [...*...] NYU shall have the right to
notify SUGEN in writing of such  failure with respect to such SUGEN  Product and
shall allow SUGEN  [...*...] to cure such  failure.  If SUGEN does not cure such
failure  within  such  period  of time,  NYU  shall  have the right by notice in
writing to SUGEN to terminate  the License  with respect to [...*...]  and/or to
convert  the  License  granted  herein  with  respect  to such  Receptor  into a
non-exclusive  license.  In  the  event  that  the  License  is  converted  to a
non-exclusive  license, all royalty and other consideration due shall be reduced
to [...*...] of the amount  stated in Section 8 or to the amount that  [...*...]
should  that  represent a lower  royalty  rate or other  consideration  payment,
provided,  that SUGEN shall retain all of its right, title and interest,  in, to
and under the  Research  Technology  with  respect  to  [...*...]  and all other
technology  owned or  developed  by or on behalf of SUGEN  with  respect to such
Receptor.


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* CONFIDENTIAL TREATMENT REQUESTED
                                       12.

<PAGE>


SECTION 12.  CONFIDENTIAL INFORMATION.

         (a) Except as otherwise  provided in Sections  12(c) and 13 below,  NYU
shall  maintain any and all of the Research  Technology in confidence  and shall
not release or disclose  any  tangible or  intangible  component  thereof to any
third  partywithout  first  receiving the prior written consent of SUGEN to said
release or disclosure.

         (b) Except as  otherwise  provided in Sections  12(c) and 12(d)  below,
SUGEN and its Sublicensees shall maintain any and all of the Research Technology
in  confidence  and shall not release or  disclose  any  tangible or  intangible
component  thereof to any third party,  except MPG,  without first receiving the
prior written consent of NYU to said release or disclosure.

         (c) The obligations of confidentiality on each party or any Sublicensee
set forth in  Sections  12(a) and (b)  shall not apply to any  component  of the
Research  Technology  (i)  which  was  part of the  public  domain  prior to the
Effective  Date of this  Agreement,  which  subsequently  becomes  a part of the
public domain through no fault of such party, which was disclosed with the prior
written  approval of the other party or which was  disclosed  to such party by a
third  party who had the right to make such  disclosure;  or (ii) to the extent,
but only to the extent,  that such  disclosure or delivery is necessary for such
party or Sublicensee to comply with applicable laws or regulations.

         (d) The  provisions  of  Section  12(b)  notwithstanding,  SUGEN or any
Sublicensee may disclose the Research  Technology (i) to third parties,  so long
as any such third party shall have signed a written agreement of confidentiality
containing provisions substantially to the effect of Sections 12(b) and (c) made
applicable to such third party;  and (ii) to the extent that such  disclosure or
delivery is  required by  regulatory  authorities  in order to obtain  necessary
approvals for any SUGEN Product or to the extent such disclosure is necessary in
connection  with  any  actions  taken or  proposed  to be taken by SUGEN or such
Sublicensee in accordance with either Section 6 or Section 11 hereof.

         (e) The  obligation of any party,  Sublicensee  or other person to hold
any Research Technology or other information in confidence shall be satisfied if
they exercise the same care with respect to such  information as they would take
to preserve the confidentiality of their own similar information.


SECTION 13.  PUBLICATION.

         (a) Prior to submission for publication of a manuscript  describing the
results of any aspect of the NYU Research  Project,  NYU shall send SUGEN a copy
of the  manuscript to be  submitted,  and shall allow SUGEN sixty (60) days from
the date of such mailing to determine  whether the manuscript  contains  subject
matter for which patent protection should be sought prior to publication of such
manuscript. Should SUGEN believe the subject matter of the manuscript contains a
patentable invention, then, prior to the expiration of such 60-day period, SUGEN
shall give written notification to NYU of:



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                                       13.

<PAGE>


                  (i) its determination that such manuscript contains patentable
subject matter for which patent protection should be sought; and

                  (ii) the countries in which such patent  protection  should be
sought.

         (b) After the expiration of such 60-day period, unless NYU has received
the written notice  specified above from SUGEN, NYU shall be free to submit such
manuscript for publication in any manner consistent with academic standards.

         (c) upon receipt of such written notice from SUGEN, NYU will thereafter
delay  submission of the  manuscript  for an  additional  period of [...*...] to
permit the  preparation and filing,  in accordance  with section 6 hereof,  of a
U.S.  patent  application  on  the  subject  matter  to  be  disclosed  in  such
manuscript.  After  expiration  of such  [...*...],  or the  filing  of a patent
application on each such invention,  whichever  shall occur first,  NYU shall be
free to submit the manuscript and to publish the disclosed results.


SECTION 14.  INFRINGEMENT OF NYU PATENT.

         (a) In the event a party to this Agreement acquires  information that a
third party is infringing  one or more of the NYU Patents,  the party  acquiring
such  information  shall  promptly  notify the other party to the  Agreement  in
writing of such infringement.

         (b) In the event of an  infringement  of an NYU Patent,  SUGEN shall be
privileged  but not required to bring suit against the  infringer.  Should SUGEN
elect to bring suit against an infringer and to join NYU as a party plaintiff in
any such suit, NYU shall have the right to approve the counsel selected by SUGEN
to represent  SUGEN,  which approval by NYU shall not  unreasonably be withheld.
The  expenses of such suit or suits that SUGEN  elects to bring,  including  any
reasonable  expenses of NYU incurred in conjunction with the prosecution of such
suit or the  settlement  thereof,  shall be paid for entirely by SUGEN and SUGEN
shall hold NYU free,  clear and  harmless  from and against any and all costs of
such litigation, including reasonable attorneys, fees.

         (c) In the event SUGEN exercises the right to sue herein conferred,  it
shall have the right to first reimburse itself out of any sums recovered in such
suit or in  settlement  thereof  for all costs and  expenses  of every  kind and
character,  including reasonable  attorneys' fees incurred in the prosecution of
any such suit, and if after such reimbursement, any funds shall remain from said
recovery,  SUGEN shall promptly pay to NYU a portion of such funds as determined
in section 8 (b) (ii) and SUGEN  shall be  entitled  to  receive  and retain the
balance of the remainder of such recovery.

         (d) If SUGEN does not bring suit  against  said  infringer  pursuant to
Section 14(b) hereof, or has not commenced  negotiations with said infringer for
discontinuance of said



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* CONFIDENTIAL TREATMENT REQUESTED
                                       14.

<PAGE>


infringement, within [...*...] days after receipt of such notice, NYU shall have
the right, but shall not be obligated,  to bring suit for such  infringement and
to join SUGEN as a party  plaintiff,  in which  case,  if NYU joins  SUGEN party
plaintiff  in such a suit,  SUGEN  shall have the right to approve  the  counsel
selected by NYU to represent NYU, which approval by SUGEN shall not unreasonably
be  withheld.  The  expenses  of such  suit or suits  that NYU  elects to bring,
including any  reasonable  expenses of SUGEN  incurred in  conjunction  with the
prosecution of such suit or the settlement  thereof,  shall be paid for entirely
by NYU and NYU shall hold SUGEN free,  clear and  harmless  from and against any
and all costs and expenses of such litigation,  including reasonable  attorneys'
fees. If SUGEN has commenced  negotiations  with an alleged infringer of the NYU
Patent for  discontinuance  of such  infringement  within such [...*...] period,
SUGEN shall have an additional  [...*...]  from the  termination of such initial
[...*...] period to conclude its negotiations before NYU may bring suit for such
infringement.  In the event NYU brings suit for  infringement of any NYU Patent,
NYU shall have the right to first reimburse  itself out of any sums recovered in
such suit or  settlement  thereof  for all costs and  expenses of every kind and
character,  including reasonable attorneys,  fees incurred in the prosecution of
such suit,  and if after such  reimbursement,  any funds shall  remain from said
recovery,  NYU shall  promptly pay to SUGEN an amount equal to [...*...] of such
remainder  and NYU shall be  entitled  to receive  and retain the balance of the
remainder of such recovery.

         (e) Each party shall always have the right to be represented by counsel
of its own selection in any suit for infringement of the NYU Patents  instituted
by the other party to this  Agreement  under the terms  hereof.  The  reasonable
expense of such counsel shall be borne by that party.

         (f) SUGEN  agrees to  cooperate  fully with NYU at the  request of NYU,
including by giving testimony and producing documents lawfully requested, in the
prosecution  of any suit by NYU for  infringement  of the NYU parents;  provided
that NYU shall pay all reasonable expenses (including  attorneys' fees) incurred
by SUGEN in connection with such  cooperation.  NYU shall, and shall endeavor to
cause the NYU Scientist to,  cooperate fully with SUGEN at the request of SUGEN,
including by giving testimony and producing documents lawfully requested, in the
prosecution of any suit by SUGEN for  infringement of the NYU Patents;  provided
that  SUGEN  shall  pay all  reasonable  expenses  (including  attorneys'  fees)
incurred by NYU in connection with such cooperation.

SECTION 15.  LIABILITY AND INDEMNIFICATION.

         (a) SUGEN shall,  subject to clause (b) of this Section 15,  indemnify,
defend  and  hold  harmless  NYU  and  its  trustees,   officers,   medical  and
professional  staff,  employees,   students  and  agents  and  their  respective
successors,  heirs and  assigns  (the  "Indemnitees"),  against  any  liability,
damage,  loss or expense (including  reasonable  attorneys' fees and expenses of
litigation)  incurred by or imposed upon the  Indemnitees  or any one of them in
connection with any claims, suits, actions, demands or judgments (i) arising out
of the  production,  manufacture,  sale,  use in commerce  or in human  clinical
trials,  lease,  or  promotion  by SUGEN,  any  Sublicensee  under the  License,
Corporation Entity or agent of SUGEN of any SUGEN Product,



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                                       15.

<PAGE>



process or service relating to, or developed pursuant to, this Agreement or (ii)
arising out of any other  activities to be carried out by SUGEN, any Sublicensee
under  the  License,  Corporation  Entity  or agent of  SUGEN  pursuant  to this
Agreement.

         (b) SUGEN's  indemnification  obligation  under Section  15(a)(I) shall
apply  to  any  liability,  damage,  loss  or  expense  whether  or  not  it  is
attributable   to  the  negligent   activities  of  the   Indemnitees.   SUGEN's
indemnification   obligation  with  respect  to  any  Indemnitee  under  Section
15(a)(ii)  shall not apply to any  liability,  damage,  loss or  expense  to the
extent that it is attributable to the negligent activities of such Indemnitee.

         (c) SUGEN agrees, at its own expense,  to provide attorneys  reasonably
acceptable  to NYU to defend  against any actions  brought or filed  against any
Indemnitee  with respect to the subject of indemnity to which such Indemnitee is
entitled hereunder whether or not such actions are rightfully brought.

SECTION 16.  SECURITY FOR INDEMNIFICATION.

         (a) At such time as any SUGEN Product,  process or service relating to,
or developed  pursuant to, this Agreement is being  commercially  distributed or
sold (other than for the purpose of obtaining  regulatory  approvals)  by SUGEN,
any Sublicensee under the License,  Corporation  Entity or agent of SUGEN, SUGEN
shall,  at  its  sole  cost  and  expense,  procure  and  maintain  policies  of
comprehensive general liability insurance in amounts not less than [...*...] per
incident and [...*...] annual aggregate and naming the Indemnitees as additional
insureds.  Such  comprehensive  general  liability  insurance  shall provide (i)
product liability  coverage and (ii) broad form contractual  liability  coverage
for SUGEN's  indemnification under Section 15 of this Agreement. If SUGEN elects
to self-insure all or part of the limits described above  (including  deductions
or  retentions  which are in excess of  [...*...]  annual  aggregate)  such self
insurance  program must be acceptable  to NYU. The minimum  amounts of insurance
coverage required under this Section 16 shall not be construed to create a limit
of SUGEN's  liability  with respect to its  indemnification  under Section 15 of
this Agreement.

         (b) SUGEN shall  provide NYU with  written  evidence of such  insurance
upon the request of NYU.  SUGEN shall  provide NYU with written  notice at least
sixty (60) days prior to any  cancellation,  non-renewal  or material  change in
such  insurance.  If  SUGEN  fails to  obtain  replacement  insurance  providing
comparable  coverage  within  such  60-day  period,  NYU shall have the right to
terminate  this  Agreement  effective at the end of such 60-day  period  without
notice or any additional waiting periods.

         (c) SUGEN shall maintain such comprehensive general liability insurance
beyond the expiration or  termination  of this  Agreement  during (i) the period
that any product,  process or service,  relating  to, or developed  pursuant to,
this  Agreement is being  commercially  distributed  or sold (other than for the
purpose  of  obtaining  regulatory  approvals)  by  SUGEN  or by a  Sublicensee,
Corporation  Entity or agent of SUGEN  and (ii) a  reasonable  period  after the
period



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                                       16.

<PAGE>



referred to in  subclause  (c)(i)  above;  provided  that the sum of the periods
referred  to in  subclauses  (c)(i) and  (c)(ii) of this  Section 15 shall in no
event be [...*...].

SECTION 17.  EXPIRY AND TERMINATION.

         (a)  unless  terminated  Pursuant  to Section  17(b) or  Section  16(b)
hereof,  except as provided in subsection  (f), this Agreement shall expire upon
the expiration of the royalty term of the License in all countries for all SUGEN
Products as set forth in section 7(b) hereof. Notwithstanding the foregoing, the
last  sentence of Section  7(b) and all of Section  7(c) shall  survive any such
expiration of this Agreement.

         (b) At any time prior to the expiration of this Agreement, either party
may terminate this Agreement forthwith for cause, as "cause" is described below,
by giving written notice to the other party.  Cause for termination by one party
of this  Agreement  shall be deemed to exist if (i) the other  party  materially
breaches or defaults in the  performance  or observance of any of the provisions
of this  Agreement and such breach or default is not cured within  [...*...] or,
in the case of failure  to pay any  amounts  due  hereunder,  [...*...]  (unless
otherwise  specified  herein) after the giving of notice by The party specifying
such breach or default, or (ii) if, with respect to the other party:

                  (A) (I) a  voluntary  case  under any  applicable  bankruptcy,
insolvency  or other  similar law now or hereafter in effect shall be instituted
by such party,  or such party shall  consent to the entry of an order for relief
in an  involuntary  case under any such law; (II) a general  assignment  for the
benefit of creditors shall be made by such party; (III) such party shall consent
to  the  appointment  of  or  possession  by a  receiver,  liquidator,  trustee,
custodian,  sequestrator or similar official of such party or of any substantial
part of its  property;  or (IV) such party  shall  adopt a board  resolution  in
furtherance of any of the foregoing actions specified in this paragraph (A); or

                  (B) a  decree  or order  for  relief  by a court of  competent
jurisdiction  shall be entered in respect of such party in an  involuntary  case
under  any  applicable  bankruptcy,  insolvency  or  other  similar  law  now or
hereafter in effect, or appointing a receiver, liquidator, trustee, sequestrator
or other similar official of such party or of any substantial part winding up or
liquidation of its affairs,  and any such decree or order shall remain  unstayed
or undischarged and in effect for a period of sixty days.

If any act or  omission by any  Sublicensee  under the  License  (including  any
further Sublicensee  thereunder) shall cause SUGEN to be in breach or default in
the  performance  or observance of any of the  provisions of this  Agreement and
such  sublicense is terminated,  then  notwithstanding  anything to the contrary
contained  in this  Agreement,  NYU shall not have the right to  terminate  this
Agreement for any such breach or default.

         (c) Any amount  payable  hereunder  by one of the parties to the other,
which has not been paid by the date on which  such  payment  is due,  shall bear
interest from such date until the



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* CONFIDENTIAL TREATMENT REQUESTED
                                       17.

<PAGE>



date on which such payment is made, at the rate [...*...] per annum in excess of
the prime rate  prevailing  at  Citibank,  N.A. in New York during the period of
arrears  and such  amount and the  interest  thereon  may be set off against any
amount due,  whether in terms of this  Agreement or  otherwise,  to the party in
default by any nondefaulting party.

         (d) Except as provided in Section 3(a), if either party terminates this
Agreement for any reason permitted hereunder,  all rights in and to the Research
Technology  shall revert to NYU, and, subject to the last sentence of Section 7,
Section 8 (a) and the last sentence of section 11(a),  SUGEN or any  Sublicensee
thereof shall not be entitled to make any further use of such rights  (except to
the extent that a third party is free to use them  without a license  from NYU);
provided,  that SUGEN shall  retain all of its right,  title and interest in, to
and under  any  other  technology  developed  by or on behalf of SUGEN  (and not
developed by NYU). In the event SUGEN shall  terminate this Agreement for cause,
such  termination  shall not terminate the License  granted  herein,  so long as
payments due under Section 8 and Section 9 are maintained.

         (e) Termination of this Agreement shall not relieve either party of any
obligation to the other party incurred prior to such termination.

         (f)  Sections  3(c),  5, 6, 9, 10, 12, 13, 14, 15, 16, 17 and 21 hereof
shall  survive  and  remain in full force and effect  after any  termination  or
expiration of this Agreement.

SECTION 18.  REPRESENTATIONS BY SUGEN AND NYU.

         (a)      SUGEN hereby represents and warrants to NYU as follows:

                  (i) SUGEN is a corporation  duly organized,  validly  existing
and in good  standing  under  the laws of the State of  Delaware.  SUGEN has all
requisite  power and  authority  to carry on its business and to own and operate
its  properties  and assets.  The  execution,  delivery and  performance of this
Agreement have been duly authorized by the Board of Directors of SUGEN;

                  (ii) There is no pending or, to SUGEN's knowledge,  threatened
litigation  involving SUGEN which would have any material adverse effect on this
Agreement or on SUGEN's ability to perform its obligations hereunder; and

                  (iii) There is no indenture,  contract,  or agreement to which
SUGEN is a party or by which SUGEN is bound which  prohibits  or would  prohibit
the  execution  and delivery by SUGEN of this  Agreement or the  performance  or
observance by SUGEN of any material term or condition of this Agreement.

         (b)      NYU represents and warrants to SUGEN as follows:



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* CONFIDENTIAL TREATMENT REQUESTED
                                       18.

<PAGE>


                  (i) The  execution  and delivery of this  Agreement  have been
duly  authorized  by all  requisite  action  on the  part of NYU and NYU has all
right, power and authority  necessary to grant the License and perform its other
obligations hereunder.

                  (ii) There is no pending  or, to NYU's  knowledge,  threatened
litigation  involving NYU which would have any material  adverse  effect on this
Agreement or on NYU's ability to perform its obligations hereunder;

                  (iii) There is no indenture,  contract,  or agreement to which
NYU is a party or by which NYU is bound which  prohibits  or would  prohibit the
execution and delivery by NYU of this Agreement or the performance or observance
by NYU of any material term or condition of this Agreement; and

                  (iv) NYU holds ail  right,  title and  interest  in and to the
Research  Technology  and, as of the  Effective  Date is the sole and  exclusive
owner  thereof,  subject  only to the  rights,  if  any,  of the  United  States
government and its agencies,  to the extent permitted under Section 4(c) hereof,
as set forth in 35 U.S.C. ss.200 et seq. NYU has not received notice of, nor has
any knowledge of any basis for, any claim that the Research Technology infringes
on any patent or other intellectual  property right or trade secret of any third
party.

SECTION 19.  ASSIGNMENT.

         Neither party shall have the right to assign,  delegate or transfer at:
any time to any  third  party,  in whole or in part,  any or all of the  rights,
duties and interest  herein granted  without first obtaining the written consent
of the other party hereto to such assignment or delegation;  provided,  however,
that if SUGEN  consolidates  with or merges into,  or sells or transfers  all or
substantially all of its assets to, any other entity,  then SUGEN may assign all
of its rights and delegate all of its duties  hereunder to such successor entity
without first obtaining the consent of NYU to such assignment and delegation.

SECTION 20.  USE OF NAME.

         Without the prior written  consent of NYU, SUGEN shall not use the name
of NYU or of any NYU  staff  member,  employee  or  student,  or any  adaptation
thereof:

                  (i) in any product labeling, advertising, promotional or sales
literature;

                  (ii) in connection  with any public or private  offering or in
conjunction with any application for regulatory  approval,  unless disclosure is
otherwise  required  by law,  in which  case SUGEN may make  factual  statements
concerning  the  Agreement or file copies of the Agreement  after  providing NYU
with an opportunity to comment and reasonable time within which to do so on such
statement in draft.


                                       19.

<PAGE>



                  Except as  provided  herein,  neither  NYU or SUGEN will issue
public  announcements about this Agreement or the status or existence of the NYU
Research Project without prior written approval of the other party.

SECTION 21.  MISCELLANEOUS.

         (a) In carrying out this  Agreement  the parties  shall comply with all
local, state and federal laws and regulations  including but not limited to, the
provisions  of 35 U.S.C.  ss. 200 et seq.,  and 15 CFR ss. 368 et seq..  Without
NYU's express prior written consent, neither SUGEN nor any Sublicensee under the
License  shall  knowingly  export,  directly or  indirectly,  (1) any of the NYU
Patents and NYU Know-How, or, (2) the direct product thereof into any country or
territory to which the  exportation  thereof  directly from the United States is
illegal at the time in question,  according to the laws of the United  States or
to  regulations  of any  department  or agency of the  Government  of the United
States made according to such laws.

         (b) If any  provision of this  Agreement is determined to be invalid or
void, the remaining provisions shall remain in effect.

         (c) This  Agreement  shall be  deemed to have been made in the State of
New York and shall be governed and interpreted in all respects under the laws of
the State of New York.

         (d) Any dispute  arising under this  Agreement  shall be resolved in an
action in the courts of New York State or the federal courts located in New York
State, and the parties hereby consent to personal jurisdiction of such courts in
any such action.

         (e) All  payments or notices  required or  permitted  to be given under
this  Agreement  shall be given in writing  and shall be  effective  when either
personally  delivered  or  deposited,  postage  prepaid,  in the  United  States
registered or certified mail, addressed as follows:

         To        NYU: New York University  Medical Center 550 First Avenue New
                   York, NY 10016

                   Attention:    Isaac T. Kohlberg
                                 Vice President for
                                 Industrial Liaison
         and
                           Office of Legal Counsel
                           New York University
                           Bobst Library
                           70 Washington Square South
                           New York, NY 10012
                           Attention:   Annette B. Johnson, Esq.
                                        Associate General Counsel



                                       20.

<PAGE>


         To SUGEN:         Stephen Evans-Freke
                           Chairman and Chief Executive Officer
                           SUGEN, Inc.
                           351 Galveston Drive
                           Redwood City, California 94063-4720

         or such  other  address  or  addresses  as either  party may  hereafter
specify by written notice to the other. Such notices and communications shall be
deemed effective on the date of delivery or fourteen (14) days after having been
sent by registered or certified mail.

         (f) This Agreement (and the annexed  Appendices)  constitute the entire
Agreement between the parties and no variation, modification or waiver of any of
the terms or conditions  hereof shall be deemed valid unless made in writing and
signed by both  parties  hereto.  This  Agreement  supersedes  any and all prior
agreements or understandings, whether oral or written, between SUGEN and NYU.

         (g) No waiver by either party of any nonperformance or violation by the
other party of any of the  covenants,  obligations  or  agreements of such other
party  hereunder  shall be deemed to be a waiver of any subsequent  violation or
non-performance of the same or any other covenant,  agreement or obligation, nor
shall  forbearance  by any party be  deemed to be a waiver by such  party of its
rights or remedies with respect to such violation or nonperformance.

         (h) The descriptive  headings  contained in this Agreement are included
for  convenience  and reference only and shall not be held to expand,  modify or
aid in the interpretation, construction or meaning of this Agreement.

         (i) It is not the  intent of the  parties  to create a  partnership  or
joint  venture  or  to  assume  partnership  responsibility  or  liability.  The
obligations  of the  parties  shall be  limited to those set out herein and such
obligations shall be several and not joint.

         IN WITNESS  WHEREOF,  the parties  hereto have executed this  Agreement
effective as of the date and year first above written.

                                                  NEW YORK UNIVERSITY

                                                  By: /s/ Isaac T. Kohlberg
                                                     ---------------------------
                                                  Name:   Isaac T. Kohlberg
                                                  Title:  Vice President for
                                                          Industrial Liaison

                                                  SUGEN, INC.
                                                     
                                                  By: /s/ Stephen Evans-Freke
                                                     ---------------------------
                                                  Name:  Stephen Evans-Freke
                                                  Title: Chairman and
                                                         Chief Executive Officer



                                       21.

<PAGE>


                                   APPENDIX I

                             PRE-EXISTING INVENTIONS


                                    [...*...]




________________________
* CONFIDENTIAL TREATMENT REQUESTED
                                       22.

<PAGE>


                                   APPENDIX II

                                RESEARCH PROGRAM

         The proposed research is an investigation of the mechanisms  underlying
the action of receptors which control the level of cellular  phosphotyrosine  by
regulating the activity of either protein  tyrosine  kinases or protein tyrosine
phosphatases. The goals of this research project are as follows:

                                    [...*...]



________________________
* CONFIDENTIAL TREATMENT REQUESTED
                                       23.

<PAGE>


 
                                       APPENDIX III
                                   SCHEDULE OF PAYMENTS
                       Payment Due                        Amount
                       -----------                        ------

                      [...*...]1991                     [...*...]
                      [...*...]1992                     [...*...]
                      [...*...]1992                     [...*...]
                      [...*...]1992                     [...*...]
                      [...*...]1992                     [...*...]
                      [...*...]1992                     [...*...]
                      [...*...]1993                     [...*...]
                      [...*...]1993                     [...*...]
                      [...*...]1993                     [...*...]
                      [...*...]1993                     [...*...]
                      [...*...]1994                     [...*...]
                      [...*...]1994                     [...*...]
                      [...*...]1994                     [...*...]
                      [...*...]1994                     [...*...]
                      [...*...]1995                     [...*...]
                      [...*...]1995                     [...*...]
                      [...*...]1995                     [...*...]
                      [...*...]1995                     [...*...]
                      [...*...]1996                     [...*...]
                      [...*...]1996                     [...*...]
                      [...*...]1996                     [...*...]
                      [...*...]1996                     [...*...]
                      [...*...]1997                     [...*...]
                      [...*...]1997                     [...*...]
                      [...*...]1997                     [...*...]
                      [...*...]1997                     [...*...]
                      [...*...]1998                     [...*...]
                      [...*...]1998                     [...*...]
                      [...*...]1998                     [...*...]
                      [...*...]1998                     [...*...]
                      [...*...]1999                     [...*...]
                      [...*...]1999                     [...*...]
                      [...*...]1999                     [...*...]
                      [...*...]1999                     [...*...]
                      [...*...]2000                     [...*...]
                      [...*...]2000                     [...*...]
                      [...*...]2000                     [...*...]
                      [...*...]2000                     [...*...]
                      [...*...]2001                     [...*...]
                      [...*...]2001                     [...*...]
                      [...*...]2001                     [...*...]


________________________
* CONFIDENTIAL TREATMENT REQUESTED
 

<PAGE>


                                   APPENDIX IV


6 June, 1997

Issac T. Kohlberg
Vice President, Industrial Liaison
NYU Medical Center
550 First Avenue
New York, NY  10016


                            CONFIDENTIALITY AGREEMENT


Dear Dr. Kohlberg:

         We are  in  possession  of  certain  information  relating  to  SUGEN's
proprietary  programs with various entities in the field of tyrosine kinases and
phosphatases,  including licensing  agreements  (hereinafter called the "Subject
Matter"),  which we consider  confidential.  We are willing to provide copies of
licensing  agreements  with these  entities  to you for the sole  purpose  ("the
Purpose") of your reviewing those agreements to assure yourself that SUGEN is in
compliance  with  its  existing  agreements  with you and of  preserving  and/or
enforcing  any right you may have under said  existing  agreement  you have with
SUGEN.  You agree to receive  such  information  from us during the term of this
Agreement on the following basis:

1.       You will hold in  confidence  any and all  information  on the  Subject
         Matter disclosed to you by us under this Agreement except:

         (a)   information  which at the time of  disclosure  was in the  public
               domain;

         (b)   information which,  after disclosure,  becomes part of the public
               domain  by  publication  or  otherwise,  except by breach of this
               Agreement by you;

         (c)   information  which you can establish by written  documents was in
               your  possession  at the  time  of  disclosure  by us and was not
               acquired, directly or indirectly, from us;

         (d)   information  which you received  non-confidentially  from a third
               party, provided,  however, that such information was not obtained
               by said third party, directly or indirectly, from us; and



                                       25.

<PAGE>


         (e)  information  which  you  can  demonstrate  written  documents  was
         independently  developed  by or for you by  persons  who did not access
         information disclosed by us under this Agreement.

2.       Such information may include  confidential and proprietary  information
         supplied to you with the legend "SUGEN  Confidential and  Proprietary,"
         and information of third parties as to which SUGEN has an obligation of
         confidentiality.

3.       You agree that you will not use the information relating to the Subject
         Matter, which you are required hereunder to keep confidential,  for any
         purpose other than the aforesaid  Purpose,  without first entering into
         an agreement with us covering the use thereof.

4.       Your obligation under this Agreement shall not expire.

If you agree to the  foregoing,  kindly  indicate  your  acceptance  thereof and
assent  thereto by signing and dating the  duplicate  copy of this letter at the
space provided for below, returning such signed copy to us. We will then proceed
to disclose to you our information relating to the Subject Matter.


                                                   Very truly yours,

                                                   SUGEN, Inc.

                                                   By: _________________________
                                                       Stephen Evans-Freke
                                                       Chief Executive Officer



AGREED TO AND ACCEPTED:

By: _____________________________

Title: __________________________

Date: ___________________________


                                       26.




                                                                   EXHIBIT 10.66


                                           *** TEXT OMITTED AND FILED SEPARATELY
                                                CONFIDENTIAL TREATMENT REQUESTED
                                            UNDER 17 C.F.R. SS.SS. 200.80(B)(4),
                                                            200.83 AND 240.24B-4


                               TERMINATION NOTICE


YISSUM RESEARCH  DEVELOPMENT COMPANY OF THE HEBREW UNIVERSITY OF JERUSALEM of 46
Jabotinsky  Street,  Jerusalem  (hereinafter  "Yissum"),  and SUGEN, INC. of 351
Galveston Drive, Redwood City, California, U.S.A. (hereinafter "SUGEN"),

         WHEREAS,  Yissum  and SUGEN are  parties  to an  Amended  and  Restated
         Research and License Agreement "Cancer" originally  effective September
         23,  1993,  as  amended  and  restated  effective  March 27,  1995 (the
         "Research Agreement").

         WHEREAS,  on June 1,  1997,  the  Research  Period  under the  Research
         Agreement ended.

         NOW,  THEREFORE,  it is hereby declared and agreed between the parties,
         intending to be legally bound, as follows:

         1. The  definitions  and  references  to the Research  Agreement in the
above introduction are an integral part of this Agreement. All capitalized terms
not defined herein shall have the same meaning as in the Research Agreement.

         2. Yissum hereby  acknowledges that all its rights,  title and interest
in the  Proprietary  Rights  related  to the  Listed  Compounds,  Listed  Target
Technologies   and  HUJ  Compounds  used  to  select  a  Listed   Compound  (the
"Technology")  listed  on  Appendix  I hereto  are  subject  to the terms of the
Research Agreement.

         3. SUGEN hereby assigns to Yissum all its right,  title and interest in
the  Proprietary  Rights  related to the HUJ  Compounds not listed on Appendix I
hereto.  From  the  date of the  signing  of this  Agreement,  Yissum  shall  be
independently entitled to take any action regarding the Technology not listed on
Appendix I hereto,  including to sell,  license or effect any other  disposition
thereof and SUGEN shall not have any other rights to such compounds.

         4. SUGEN shall perform all the necessary actions in order to effect the
transfer of rights in the  Proprietary  Rights to the  Technology  not listed in
Appendix I hereto, and shall sign the documents necessary to effect the transfer
including the patent assignment documents  appropriate for each involved country
and any  additional  document  required  to  implement  and  said  transfer  and
assignment.  Yissum shall be  responsible  for all legal and  governmental  fees
associated with the preparation, filing and/or recording of said assignments and
documents.

         5. The parties  further agree that, if it should be determined that any
of the Proprietary Rights with respect to the Technology listed in Appendix I in
the case of SUGEN or not so listed in the case of Yissum are  dominant to any of
the Proprietary Rights of the other

                                       1.

<PAGE>


party,  it does grant an  exclusive  license to the other  party  (with right to
sublicense)  to practice any such dominant  Proprietary  Rights for the sole and
limited  purpose of  practicing  the  Proprietary  Rights as otherwise set forth
herein.

         6. All notices and  communications  pursuant to this Agreement shall be
made in writing by registered mail such as international Federal Express or such
other  courier  service  providing  a  written  record of such  mailing  and its
receipt,  and shall be deemed to have been  received by the  receiving  party 96
hours  after  being  posted,  unless  the  written  record  provided  for herein
establishes that delivery was not made until a later date.

         7. The  provisions of this  Agreement  and  everything  concerning  the
relationship  between the parties in  accordance  with this  Agreement  shall be
governed by law of England and Wales.


Dated:  as of June 1, 1997

YISSUM Research Development Company       SUGEN, INC.
of the Hebrew University of Jerusalem


By:  /s/ Uri Litrin                       By:  /s/ Peter Hirth
     --------------------------------          ---------------------------------
     Name:  Uri Litrin                         Name: Peter Hirth

     Title: Managing Director                  Title: Executive V.P. of Drug R&D


                                       2.

<PAGE>


                        APPENDIX I TO TERMINATION NOTICE
                            DATED: AS OF JUNE 1, 1997
                                LISTED COMPOUNDS



                                   [... * ...]

- -------------------------
* CONFIDENTIAL TREATMENT REQUESTED


<TABLE> <S> <C>


<ARTICLE>                     5
<LEGEND>
     THE SCHEDULE  CONTAINS  SUMMARY  FINANCIAL  INFORMATION  EXTRACTED FROM THE
     COMPANY'S FORM 10-Q FOR THE SIX MONTHS ENDED JUNE 30, 1997 AND IS QUALIFIED
     IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS,
</LEGEND>
<MULTIPLIER>                                   1,000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1997
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<PERIOD-END>                                   JUN-30-1997
<CASH>                                         8,185
<SECURITIES>                                   34,679
<RECEIVABLES>                                  0
<ALLOWANCES>                                   0
<INVENTORY>                                    0
<CURRENT-ASSETS>                               43,732
<PP&E>                                         9,638
<DEPRECIATION>                                 5,638
<TOTAL-ASSETS>                                 48,713
<CURRENT-LIABILITIES>                          11,845
<BONDS>                                        3,226
                          0
                                    0
<COMMON>                                       108,700
<OTHER-SE>                                     (75,058)
<TOTAL-LIABILITY-AND-EQUITY>                   48,713
<SALES>                                        0
<TOTAL-REVENUES>                               2,971
<CGS>                                          0
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<OTHER-EXPENSES>                               16,576
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<INTEREST-EXPENSE>                             344
<INCOME-PRETAX>                                (15,636)
<INCOME-TAX>                                   0
<INCOME-CONTINUING>                            (15,636)
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<CHANGES>                                      0
<NET-INCOME>                                   (15,636)
<EPS-PRIMARY>                                  (1.20)
<EPS-DILUTED>                                  (1.20)
        


</TABLE>


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