MATRIX PHARMACEUTICAL INC/DE
10-Q, 1996-08-08
PHARMACEUTICAL PREPARATIONS
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                                  UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549



                                    FORM 10-Q


(X)      QUARTERLY  REPORT  PURSUANT  TO SECTION  13 OR 15(d) OF THE  SECURITIES
         EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED June 30, 1996

                                       OR

( )      TRANSITION   REPORT  PURSUANT TO SECTION 13  OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934



Commission File number:    0-19750
                       --------------------

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



             Delaware                                        94-2957068
   (State or other jurisdiction of                        (I.R.S. Employer
    incorporation or organization)                        Identification No.)


  34700 Campus Drive, Fremont, California                       94555
  (Address of principal executive offices)                    (Zip  Code)



       Registrant's telephone number, including area code: (510) 742-9900




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  preceeding 12 months (or for such shorter  period that the  registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days.

                                    Yes X   No
                                       --     --

Number of shares of Common  Stock,  $.01 par value,  outstanding  as of June 30,
1996: 21,238,156.

                                                                          Page 1
<PAGE>

                           MATRIX PHARMACEUTICAL, INC.


                                      INDEX





         PART I.                    FINANCIAL INFORMATION               Page No.


Item 1.  Financial   Statements


         Condensed Consolidated Balance Sheets -
         June 30, 1996 and December 31, 1995                                3

         Condensed Consolidated Statements of Operations -
         Three Months and Six Months Ended June 30, 1996 and 1995           4

         Condensed Consolidated Statements of Cash Flows -
         Six Months Ended June 30, 1996 and 1995                            5

         Notes to Condensed Consolidated Financial Statements               6


Item 2.  Management's Discussion and Analysis of Financial
         Condition and Results of Operations                                8


         PART II.                   OTHER INFORMATION

         Risk Factors                                                      10

Item 4.  Submission of Matters to a Vote of Security Holders               19

Item 6.  Exhibits and Reports on Form 8-K                                  20

         Signatures                                                        21


                                                                          Page 2
<PAGE>
<TABLE>

                          MATRIX PHARMACEUTICAL, INC.
                         (a development stage company)

                     Condensed Consolidated Balance Sheets


<CAPTION>
                                                                  (In thousands)     
                                                           
                                                            June 30,     December 31,
                                                              1996           1995
                                                          ------------   ------------
Assets                                                    (Unaudited)
<S>                                                        <C>           <C>      
Current assets:                                            
 Cash and cash equivalents                                 $  25,843     $  55,675
 Short-term investments                                       29,559         9,646
 Other current assets                                          1,199           952
                                                          ------------   ------------
  Total current assets                                        56,601        66,273
                                                           
Property and equipment, net                                   16,755        15,919
Non-current investments                                       73,977        12,010
Deposits and other assets, net                                   177           217
                                                          ------------   ------------
                                                           $ 147,510     $  94,419
                                                          ============   ============
Liabilities and Stockholders' Equity                       
                                                           
Current liabilities:                                       
 Accounts payable                                          $   1,177     $   1,605
 Accrued liabilities                                           2,893         3,322
 Current portion of debt and capital lease obligations           727           830
                                                          ------------   ------------
  Total current liabilities                                    4,797         5,757
                                                           
Debt and capital lease obligations, less current portion      12,129        12,307
Stockholders' equity                                       
 Capital stock                                               222,018       153,427
 Other                                                          (904)         (826)
 Deficit accumulated during the development stage            (90,530)      (76,246)
                                                          ------------   ------------
  Total stockholders' equity                                 130,584        76,355
                                                          ------------   ------------
                                                          $  147,510     $  94,419
                                                          ============   ============
<FN>
                                               
                             See Accompanying Notes
</FN>
</TABLE>

                                                                          Page 3
<PAGE>

                          MATRIX PHARMACEUTICAL, INC.
                         (a development stage company)

                Condensed Consolidated Statements of Operations

                    (In thousands except per share amounts)




                                   Three Months Ended       Six Months Ended  
                                        June 30,                June 30,
                                    1996       1995        1996          1995
                               ------------ ----------- ----------- -----------
                                 (Unaudited)(Unaudited) (Unaudited) (Unaudited)
                                 
Revenues                        $       -    $      -    $      -    $      -
                               
Costs and expenses:
 Research and development           6,304       4,503      12,004       8,935
 General and administrative         2,176       1,361       4,304       2,636
                                ------------ ----------- ----------- -----------
  Total costs and expenses          8,480       5,864      16,308      11,571
                                ------------ ----------- ----------- -----------
Loss from operations               (8,480)     (5,864)    (16,308)    (11,571)

Interest and other income, net      1,274         309       2,024         732
                                ------------ ----------- ----------- -----------
Net loss                         $ (7,206)   $ (5,555)   $(14,284)   $(10,839)
                                ============ =========== =========== ===========
Net loss per share               $  (0.34)   $  (0.51)   $  (0.76)   $  (1.01)
                                ============ =========== =========== ===========
Weighted average number
of shares outstanding              20,877      10,800      18,909      10,780
                                ============ =========== =========== ===========
                                  
                             See Accompanying Notes
                                                                          Page 4
<PAGE>

                          MATRIX PHARMACEUTICAL, INC.
                         (a development stage company)

                 Condensed Consolidated Statements of Cash Flows
                Increase (Decrease) in Cash and Cash Equivalents

                                 (In thousands)

                                                     For the six months      
                                                       ended June 30,         
                                                     1996         1995      
                                                 -----------   ----------
                                                 (Unaudited)   (Unaudited)
Cash flows from operating activities:
   Net loss                                        $(14,284)   $(10,839)
   Adjustments to reconcile net loss to
    net cash used by operating activities:
    Depreciation and amortization                       516         445
    Amortization of deferred compensation                84         101
    Other                                                27         110
   Changes in assets and liabilities:
    Other current assets                               (247)       (307)
    Deposits and other assets                            40           7
    Accounts payable                                   (428)       (428)
    Other accrued liabilities                          (429)        396
                                                  -----------   ----------
     Net cash used by operating activities          (14,721)    (10,515)
Cash flows from investing activities:
   Capital expenditures                              (1,352)       (131)
   Investment in securities available-for-sale      (96,431)       (187)
   Proceeds of securities available-for-sale          8,404       4,845
   Maturities of investments                          6,221       4,072
                                                  -----------   ----------
    Cash flows provided (used) by
      investing activities                          (83,158)      8,599
Cash flows from financing activities:
   Payments on debt and capital lease oblgations       (281)       (203)
   Net cash proceeds from issuance of:
    Debt and capital lease financing                      -         232
    Capital stock                                    68,328          47
                                                  -----------   ----------
    Cash flows provided by financing activities      68,047          76
Net decrease in cash and cash equivalents           (29,832)     (1,840)
Cash and cash equivalents at the
    beginning of period                              55,675      10,276
                                                  -----------   ----------
Cash and cash equivalents at the end of period     $ 25,843     $ 8,436
                                                  ===========   ==========

                             See Accompanying Notes
                                           
                                                                          Page 5
<PAGE>

                           MATRIX PHARMACEUTICAL, INC.


              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

                                  June 30, 1996

1.       Basis of presentation

                  The results of  operations  for the interim  periods  shown in
         this report are not  necessarily  indicative  of results to be expected
         for the year ending  December 31, 1996.  In the opinion of  management,
         the information  contained herein reflects all adjustments necessary to
         make the results of operations for the interim periods a fair statement
         of such  operations.  All such  adjustments  are of a normal  recurring
         nature.

                  These condensed  consolidated  financial  statements should be
         read in conjunction with the Company's audited  consolidated  financial
         statements for the year ended December 31, 1995,  which were filed with
         the Securities and Exchange  Commission on Form 10-K, and the Company's
         quarterly  report on Form 10-Q,  filed with the Securities and Exchange
         Commission for the quarter ended March 31, 1996.

2.       Principles of consolidation

                  The consolidated  financial statements include the accounts of
         the Company and its wholly owned  subsidiary  after  elimination of all
         material intercompany balances and transactions.

3.       Net loss per share

                  Net loss per  share is  computed  using the  weighted  average
         number of shares of common stock outstanding during the period.  Common
         stock  equivalents  consisting of stock options,  convertible  Series A
         preferred  shares and  warrants are excluded  from the  computation  as
         their impact is anti-dilutive.

4.       Cash and cash  equivalents,  short-term  investments,  and  non-current
         investments

                  The  Company   invests  its  excess  cash  in  government  and
         corporate  securities.  Highly liquid  investments  with  maturities of
         three months or less at the date of  acquisition  are considered by the
         Company to be cash  equivalents.  Investments  with  maturities  beyond
         three months at the date of acquisition and that mature within one year
         from  the  balance   sheet  date  are   considered   to  be  short-term
         investments.  Investments with maturities longer than one year from the
         balance  sheet  date  are  classified  as  short-term   investments  or
         non-current investments based on the Company's intended holding period.

                  The  Company   maintains  its  cash,   cash   equivalents  and
         investments in several different  instruments held by various banks and
         brokerage houses.  This  diversification of risk is consistent with the
         Company's  policy  to  maintain  liquidity  and  ensure  the  safety of
         principal.

                                                                          Page 6
<PAGE>

                  The Company determines the appropriate  classification of debt
         securities at the time of purchase and reevaluates  such designation as
         of each balance sheet date.  The amortized  cost of debt  securities is
         adjusted for  amortization  of premiums  and  accretion of discounts to
         maturity.  Such  amortization is included in interest and other income.
         Realized   gains  and  losses  and  declines  in  value  judged  to  be
         other-than-temporary  are also  included in interest and other  income.
         The cost of  securities  sold is based on the  specific  identification
         method.  Debt  securities are classified as  held-to-maturity  when the
         Company has the positive  intent and ability to hold the  securities to
         maturity and are carried at amortized cost.

                  Debt securities  which are not classified as  held-to-maturity
         and which are not held for resale in anticipation of short-term  market
         movements  are  classified  as  available-for-sale.  Available-for-sale
         securities  are carried at fair value,  with the  unrealized  gains and
         losses,  net of tax, reported in a separate  component of stockholders'
         equity.

5.       Stockholders' equity

                  On  April  8,  1996,  the  Company  completed  the  sale  of a
         3,162,500 share public offering of the Company's common stock at $22.63
         per share  which  resulted  in net  proceeds  of $67.4  million  to the
         Company.

6.       Subsequent event

                  On July 15,  1996 the Company  entered  into an  agreement  to
         lease out a portion of its San Diego manufacturing  facility.  The term
         of the lease is two years  commencing July 15, 1996 and ending July 14,
         1998 and the lease payments during that period total approximately $2.9
         million.

                                                                          Page 7
<PAGE>
                           MATRIX PHARMACEUTICAL, INC.


                     MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                  FINANCIAL CONDITION AND RESULTS OF OPERATIONS


         This report contains  certain  statements of a  forward-looking  nature
relating  to future  events  or the  future  performance  of the  Company.  Such
statements  are only  predictions  and the actual  events or results  may differ
materially from the results discussed in the forward-looking statements. Factors
that could cause or contribute to such  differences  include those  discussed in
"Risk  Factors" in the 1995 Form 10-K and March 31,  1996 Form 10-Q,  as well as
those discussed elsewhere in this report.


Results of Operations

         Three and Six Months Ended June 30, 1996 and 1995

         Since  the  Company's  inception  in  1985,  the  primary  focus of its
operations  has been research and  development,  and to date it has not received
any revenues from the commercial sale of products.  The Company anticipates that
it will not  recognize  any  revenues  from  commercial  sales until  regulatory
approvals  are  obtained.  The  Company  has a history of  operating  losses and
expects to incur substantial additional losses over the next several years as it
continues  to develop  its  products.  For the period  from  February  11,  1985
(inception)  to June 30, 1996 the Company has incurred a cumulative  net loss of
$90,530,000.

         The Company had no revenue in the second  quarters of 1996 and 1995 and
the first six months of 1996 and 1995.

         Research  and  development  expenses  for the  second  quarter  of 1996
increased by 40% to $6,304,000 versus $4,503,000 for the second quarter of 1995.
For the first six months of 1996, research and development expenses increased by
34%  to   $12,004,000   compared  to  $8,935,000  in  1995.  The  quarterly  and
year-to-date  increases were  primarily due to higher  clinical costs to support
basal cell  cancer,  head and neck cancer and other  accessible  tumors,  higher
personnel related  expenses,  higher occupancy  expenses,  and higher production
costs in preparation  for the commercial  launch of AccuSiteTM for the treatment
of genital warts.

         General and administrative  expenses increased by 60% to $2,176,000 for
the second  quarter of 1996  compared to  $1,361,000  for the second  quarter of
1995.  For the first six months of 1996,  general  and  administrative  expenses
increased by 63% to $4,304,000  versus  $2,636,000  for the same period in 1995.
The quarterly and year-to-date  increases were due to higher  personnel  related
expenses,   including  new  marketing  staff,  higher  occupancy  expenses,  and
AccusiteTM market research expenses.  The year-to-date  increase was also due to
increased legal expenses related to the Collagen Corporation litigation.

         Net interest and other income  increased to  $1,274,000  for the second
quarter of 1996 versus  $309,000 for the second  quarter of 1995.  For the first
six months of 1996,  net  interest  and other  income  increased  to  $2,024,000
compared to $732,000 in 1995.  The increase was  primarily  the result of higher
average  balances in cash, cash  equivalents and marketable  securities in 1996.
This was  partially  offset  by  higher  interest  expense  associated  with the
mortgage on the Company's San Diego manufacturing facility,  which was purchased
in the fourth quarter of 1995.

                                                                          Page 8
<PAGE>


Liquidity and Capital Resources

         At June 30,  1996,  the  Company  had  $129.4  million  in  cash,  cash
equivalents and marketable  securities compared to $77.3 million at December 31,
1995.

         On April 8, 1996, the Company  completed the sale of a 3,162,500  share
public offering of the Company's common stock at $22.63 per share which resulted
in net proceeds of $67.4 million to the Company.

         During the first  quarter  of 1996,  13,334  outstanding  shares of the
Company's  Series A preferred stock were converted into 1,333,400  shares of the
Company's common stock.

         The Company has financed its operations and capital asset  acquisitions
from its  inception  through the sale of equity  securities,  contract  research
revenues,  license fees,  interest income, and capital lease and debt financing.
The Company expects to finance its continued operating requirements  principally
with cash on hand as well with additional  capital  generated through equity and
debt financings and collaborative agreements.

         The Company's  working capital and capital  requirements will depend on
numerous  factors,   including  the  progress  of  the  Company's  research  and
development  programs,  preclinical  testing and clinical trial activities,  the
timing and cost of obtaining regulatory approvals,  the levels of resources that
the  Company  devotes  to  the  development  of   manufacturing   and  marketing
capabilities, technological advances and the status of competitors.

         The Company expects to incur  substantial  additional costs relating to
the  continued  clinical  development  of its products,  continued  research and
development   programs,   the   development   of  marketing  and   manufacturing
capabilities,  the purchase of additional  capital equipment and general working
capital  requirements.  The Company  anticipates that its existing and committed
capital  resources,  including the proceeds of the public offering  completed in
April  1996,  will enable it to  maintain  its  current  and planned  operations
through 1998. The Company may require  additional  outside financing to complete
the process of bringing current products to market, and while the Company is not
aware of any limitations on future sources of capital, there can be no assurance
that such financing will be available on favorable terms, if at all.

         Capital  expenditures  for  environmental   control  efforts  were  not
material during the first six months of 1996 and 1995.

                                                                          Page 9

<PAGE>

                           MATRIX PHARMACEUTICAL, INC.

                                  RISK FACTORS

No Assurance of Regulatory Approvals

         The preclinical and clinical testing,  manufacturing,  and marketing of
the  Company's  products  are  subject  to  extensive   regulation  by  numerous
governmental  authorities in the United States and other  countries,  including,
but not  limited  to, the FDA.  Among other  requirements,  FDA  approval of the
Company's  products,  including  a review  of the  manufacturing  processes  and
facilities used to produce such products,  will be required before such products
may be marketed in the United States. Similarly, marketing approval by a foreign
governmental  authority  is  typically  required  before  such  products  may be
marketed in a particular foreign country. Matrix has no products approved by the
FDA and one  product  approved  by a foreign  authority  and does not  expect to
achieve  profitable   operations  unless  other  product  candidates  now  under
development  receive  FDA or  foreign  regulatory  approval  and are  thereafter
commercialized successfully.

         In  order to  obtain  FDA  approval  of a  product,  the  Company  must
demonstrate  to the  satisfaction  of the FDA  that  such  product  is safe  and
effective for its intended uses and that the Company is capable of manufacturing
the product with procedures that conform to the FDA's current good manufacturing
practice ("GMP")  regulations,  which must be followed at all times. The Company
has  had  only  limited   experience  in  submitting  and  pursuing   regulatory
applications.  The  process of  obtaining  FDA  approvals  can be  costly,  time
consuming,  and subject to unanticipated  delays. There can be no assurance that
such approvals will be granted to the Company on a timely basis, or at all.

         The process of obtaining FDA regulatory  approval  involves a number of
steps that, taken together,  may involve seven years or more from the initiation
of clinical trials and require the expenditure of substantial  resources.  Among
other  requirements,  this process  requires that the product undergo  extensive
preclinical and clinical testing and that the Company file an NDA requesting FDA
approval.  When a product  contains more than one component that  contributes to
the product's effect, as do all of the Company's current product candidates, the
FDA may request that  additional  data be submitted in order to demonstrate  the
contribution  of each such  component to clinical  efficacy.  In addition,  when
there has been a  manufacturing  change in a product  component  (either  in the
process  by  which  the  component  is  manufactured  or the site at which it is
manufactured) during product  development,  as is the case with the collagen gel
used in the Company's AccuSite product, the FDA may request that additional data
be submitted to demonstrate that the  manufacturing  change has not affected the
clinical performance of the product. In addition,  the manufacturing  facilities
for the product must be inspected and accepted by the FDA as being in compliance
with GMP regulations prior to approval of the product. There can be no assurance
that the  Company's  manufacturing  facilities  in San Jose and Milpitas will be
accepted  by the FDA,  and  failure  to  achieve  such  acceptance  would have a
material adverse effect on the Company's business.

         Matrix has used three different sources of collagen gel in the products
on which it has conducted clinical trials:  Koken Co., Ltd. ("Koken"),  Collagen
Corporation  ("Collagen")  and its own  production.  The Company  intends to use
collagen gel of its own  manufacture in products it markets  commercially if FDA
approval is received.  Accordingly,  the Company has not  referenced  Collagen's
Pre-Market Approval files in its NDA. (See "-- Litigation" )

         However, as noted above, when there has been a manufacturing  change in
a product, such as a change in the supplier of a component,  the FDA may request
that additional data be submitted to demonstrate that the  manufacturing  change
has not  affected the  clinical  performance  of the 

                                                                         Page 10
<PAGE>

product as shown in earlier clinical trials. Accordingly, Matrix has conducted a
series of  preclinical  studies  to show  comparability  of  products  made from
Collagen,  Koken and Matrix collagen gel, a human  pharmakokinetic study to show
comparability  of products made with Matrix and Collagen  collagen gel and Phase
III clinical trials to show  comparability in clinical  performance of a product
made with Koken collagen gel and a product made with Collagen  collagen gel. The
Company  also  conducted  a Phase  III(b)  clinical  trial  to  demonstrate  the
comparable clinical  performance of a product made with Matrix collagen gel to a
product made with Collagen  collagen gel. The Company  believes that all studies
conducted to date have supported the comparable clinical performance of products
made with  collagen  gel from all three  sources,  but there can be no assurance
that the FDA will agree.  In addition,  there can be no  assurance  that the FDA
will not require further clinical  demonstrations either of the comparability of
a product made with Matrix  collagen gel to product made with Collagen  collagen
gel or Koken  collagen  gel, or the safety and  efficacy of a product  made with
Matrix  collagen  gel. If questions  arise during the FDA review  process  about
comparability  or about the safety and efficacy of a product made with collagen,
it could delay the approval process or prevent approval.

         The Company's analysis of the results of its clinical studies submitted
as part of an NDA is subject to review and  interpretation by the FDA, which may
differ from the Company's analysis. There can be no assurance that the Company's
data or its  interpretation  of data will be accepted  by the FDA. In  addition,
delays or rejections may be encountered  based upon changes in applicable law or
FDA policy during the period of product  development and FDA regulatory  review.
Any failure to obtain,  or delay in  obtaining,  FDA approvals  would  adversely
affect the ability of the  Company to market its  proposed  products.  Moreover,
even  if  FDA  approval  is  granted,  such  approval  may  include  significant
limitations on indicated uses for which a product could be marketed.

         Both  before  and  after   approval  is   obtained,   a  product,   its
manufacturer,  and  the  holder  of the  NDA  for the  product  are  subject  to
comprehensive regulatory oversight. Violations of regulatory requirements at any
stage,  including the preclinical  and clinical  testing  process,  the approval
process  or  thereafter  (including  after  approval),  may  result  in  adverse
consequences,  including  the FDA's delay in  approving  or refusal to approve a
product,  withdrawal  of  an  approved  product  from  the  market,  and/or  the
imposition of criminal penalties against the manufacturer and/or the NDA holder.
In  addition,  later  discovery of  previously  unknown  problems  relating to a
marketed  product may result in restrictions on such product,  manufacturer,  or
the NDA holder,  including  withdrawal of the product from the market. Also, new
government   requirements  may  be  established  that  could  delay  or  prevent
regulatory   approval  of  the  Company's   products  under   development.   See
"--Uncertainty   of   Pharmaceutical   Pricing;   No   Assurance   of   Adequate
Reimbursement."

         The processes  required by European  regulatory  authorities before the
Company's products can be marketed in Western Europe are similar to those in the
United States.  First,  appropriate  preclinical  laboratory and animal tests as
well as analytical product quality tests must be done, followed by submission of
a  clinical  trial  exemption  ("CTX")  or similar  documentation  before  human
clinical  trials  can  be  initiated.  Upon  completion  of  adequate  and  well
controlled  clinical  trials in humans that  establish that the drug is safe and
efficacious,  regulatory  approval of a Market  Authorization  Application (MAA)
must be obtained from the relevant regulatory authorities. The Company filed its
MAA for  AccuSite  in the  United  Kingdom  in  August  1995  under  the  mutual
recognition  process  of a product.  The  Company  subsequently  filed an MAA in
Germany, France, Italy and Sweden. As with the United States FDA review process,
there are numerous risks associated with the MAA review.  Additional data may be
requested  by  the  regulatory  agency  reviewing  the  MAA to  demonstrate  the
contribution  of a product  component to the  clinical  safety and efficacy of a
product,  or to confirm the comparable  performance  of materials  produced by a
changed manufacturing process or at a changed manufacturing site.

                                                                         Page 11
<PAGE>

         In June 1996, the Company was notified by the Medicines  Control Agency
in the United Kingdom that a product license has been granted for AccuSiteTM for
the  treatment of genital  warts.  However,  there can be no assurance of mutual
recognition by other participating states of the approval obtained in the United
Kingdom.

Uncertainties Associated with Clinical Trials

         Matrix has conducted  and plans to continue to undertake  extensive and
costly  clinical  testing to assess the safety  and  efficacy  of its  potential
products.  Failure to comply with FDA regulations applicable to such testing can
result in delay, suspension,  or cancellation of such testing, and/or refusal by
the FDA to accept the results of such testing. In addition,  the FDA may suspend
clinical  trials  at any time if it  concludes  that the  subjects  or  patients
participating  in such trials are being  exposed to  unacceptable  health risks.
Further,  there can be no assurance  that human  clinical  testing will show any
current  or  future  product  candidate  to be safe and  effective  or that data
derived therefrom will be suitable for submission to the FDA.

         The Company is currently  conducting  multiple  clinical  trials in the
United  States and certain  foreign  countries,  including two ongoing Phase III
trials.  The rate of completion of the  Company's  clinical  trials is dependent
upon, among other factors, the rate of patient enrollment. Patient enrollment is
a function of many factors,  including the size of the patient  population,  the
nature of the  protocol,  the  proximity  of patients to clinical  sites and the
eligibility  criteria for the study.  Delays in planned  patient  enrollment may
result in increased costs and delays, which could have a material adverse effect
on the Company.  Generally similar considerations apply to clinical testing that
is  subject  to  regulatory  oversight  by foreign  authorities  and/or  that is
intended to be used in connection with foreign marketing applications.

         In June  1996  the  Company  announced  a delay in the  development  of
AccuSiteTM  Injectible Gel for patients with basal cell cancer.  This delay is a
result of  disappointing  findings in preliminary data analysis of two identical
Phase II  "contribution  of components"  trials.  These studies were designed to
demonstrate  that each ingredient  (component) of the AccuSiteTM gel formulation
provides a  statistically  significant  contribution  to the  performance of the
product.  Depending upon the results of the Company's analysis,  the Company may
further delay,  may have to perform  additional  clinical  trials which may also
delay, or cancel, the development of AccuSiteTM Injectible Gel for patients with
basal  cell  cancer,  which  could  result in a material  adverse  effect on the
Company's business.

History of Losses; Future Profitability Uncertain

         Matrix was incorporated in 1985 and has experienced  significant losses
since that date.  As of June 30, 1996,  the  Company's  accumulated  deficit was
approximately  $90.5  million.  The Company has not generated  revenues from its
products  and  expects  to incur  significant  additional  losses  over the next
several years. The Company's ability to achieve a profitable level of operations
is  dependent  in large  part on  successfully  developing  products,  obtaining
regulatory  approvals  for  its  products,  and  making  the  transition  to  an
organization  producing  commercial  products and entering into  agreements  for
product commercialization.  No assurance can be given that the Company's product
development efforts will be completed,  that required regulatory  approvals will
be obtained,  that any products will be manufactured and marketed  successfully,
or that profitability will be achieved.

Additional Financing Requirements and Uncertain Access to Capital Markets

         The Company has expended and will continue to expend  substantial funds
to complete the  research and  development  of and to market its  products.  The
Company will require  additional 

                                                                         Page 12
<PAGE>

funds  for  these  purposes  through   additional  equity  or  debt  financings,
collaborative  arrangements  with corporate  partners or from other sources.  No
assurance  can be  given  that  such  additional  funds  will  be  available  on
acceptable terms, if at all. If adequate funds are not available from operations
or additional  sources of financing,  the Company's business could be materially
and  adversely  affected.  Based on its  current  operating  plan,  the  Company
anticipates that its existing capital  resources will be adequate to satisfy its
capital  needs  through  1998.  See  "Management's  Discussion  and  Analysis of
Financial Condition and Results of Operations."

Limited Sales and Marketing Experience

         The  Company  intends to market and sell  certain of its  products,  if
successfully developed and approved,  through a direct sales force in the United
States, by co-promoting  certain products to selected physician  specialties and
through sales and marketing partnership  arrangements outside the United States.
The Company  currently  has limited  marketing  and sales staff,  and has yet to
announce  any  co-promotion  or  distribution   arrangements.   The  Company  is
developing a sales and  marketing  plan for  AccuSite and its other  products in
clinical development. In order to market its products directly, the Company must
develop a sales force with technical  expertise.  There can be no assurance that
the Company will be able to establish a successful direct sales  organization or
co-promotion  or  distribution  arrangements.  In  addition,  there  can  be  no
assurance  that there will be sufficient  sales of AccuSite or other products to
fund related  expenses,  many of which must be incurred  before sales  commence.
Failure to  establish  a marketing  and sales  capability  in the United  States
and/or  outside  the United  States may have a  material  adverse  effect on the
Company.

Limited Manufacturing Experience

         The Company's  ability to conduct clinical trials on a timely basis, to
obtain  regulatory  approvals and to  commercialize  its products will depend in
part upon its ability to manufacture  its products,  either  directly or through
third parties,  at a competitive  cost and in accordance with applicable FDA and
other  regulatory  requirements,  including  GMP  regulations.  The  Company  is
currently  manufacturing  AccuSite and IntraDose for its clinical  trials at its
manufacturing  facilities  in San  Jose  and  Milpitas,  California,  as well as
contract manufacturing  facilities.  The Company anticipates that its facilities
in San Jose and Milpitas should provide sufficient  production  capacity to meet
clinical and early commercial  requirements of its AccuSite product and selected
components  for  IntraDose  products  through  1997.  However,  there  can be no
assurance  that the Company will be able to produce  adequate  quantities of its
products  for its  clinical  trials  in a  cost-effective  manner  or  that  the
Company's current manufacturing facilities will be accepted by the FDA.

         In December  1995, the Company  purchased a research and  manufacturing
facility in San Diego,  California.  The Company intends to use this facility to
meet its  long-term  commercial  scale  production  requirements.  This facility
requires   validation  and  process   installation  that  will  require  capital
expenditures  of  approximately  $10 million.  The Company  estimates  that this
facility  will not be  available  for  production  until  1998.  There can be no
assurance  that the Company will be able to validate and scale up this  facility
in a timely manner or that this facility will be adequate for Matrix's long-term
needs  without  delay to the Company's  ability to meet product  demand.  Matrix
expects to continue to use selected contract  manufacturers,  in addition to its
own manufacturing capability, for some or all of its product components. Failure
to  establish  additional  manufacturing  capacity on a timely  basis may have a
material adverse effect on the Company.

Dependence on Sources of Supply

         Several of the materials  used in the Company's  products are available
from a limited  number of  suppliers.  These items,  including  collagen gel and
various bulk drug substances, have generally been available to Matrix and others
in  the  pharmaceutical  industry  on  commercially  reasonable  terms.  If  the
Company's manufacturing facilities are not able to produce sufficient 

                                                                         Page 13
<PAGE>

quantities  of collagen  gel in  accordance  with  applicable  regulations,  the
Company  would  have to  obtain  collagen  gel  from  another  source  and  gain
regulatory approval for that source.  There can be no assurance that the Company
would be able to  locate  an  alternative,  cost-effective  source  of supply of
collagen gel. Matrix has negotiated and intends to continue to negotiate  supply
agreements, as appropriate,  for the components of raw materials utilized in its
products.  Matrix is also in the process of attempting to approve second sources
for as many as possible of these supplies. Any interruption of supply could have
a material adverse effect on the Company's  ability to manufacture its products,
and thus the  ability  to  complete  the  clinical  trials  or to  commercialize
products.  In addition,  cisplatin,  a  chemotherapeutic  drug being used by the
Company in its current clinical trials, is currently available only for research
purposes  in the United  States.  Prior to the  expiration  of the patent in the
United States in 1996, the Company may not commercialize  products incorporating
cisplatin in the United States  without a license.  To the Company's  knowledge,
there  are  no  such   restrictions  in  Europe.   The  Company's   process  for
manufacturing  collagen gel is currently  being  challenged in  litigation  with
Collagen. See "--Litigation."

Litigation

         On December 21, 1994,  Collagen filed a lawsuit  against the Company in
Santa Clara County  Superior  Court alleging  misappropriation  of trade secrets
concerning the manufacturing process for collagen,  including breach of contract
and fraud.  The  Complaint  seeks  unspecified  damages  and  injunctive  relief
directed to Matrix's  manufacture of collagen,  its  regulatory  filings and its
hiring of current or former  Collagen  employees.  On  February  14,  1995,  the
Company  filed  its  answer  to  Collagen's  complaint,  denying  all  claims of
misappropriation, asserting several affirmative defenses and seeking recovery of
its attorneys' fees.  Matrix has also filed a  cross-complaint  against Collagen
and Howard  Palefsky,  Collagen's Chief Executive  Officer,  seeking recovery of
damages for defamation,  violations of California antitrust law and other causes
of action. The parties are currently  conducting discovery and no trial date has
been set with  respect  to any of the  claims  asserted  by  Collagen  or by the
Company.

         On September 12, 1995, Collagen filed a First Amended Complaint, adding
as  defendants  two  former  Collagen  employees  currently  working  at Matrix,
alleging  that these  employees  used  confidential  documents  and  information
acquired  by  them as  Collagen  employees  for the  benefit  of  Matrix.  These
employees had been accused of wrong-doing in the original  Complaint  along with
other former Collagen employees, but not named as defendants.  The First Amended
Complaint purports to add causes of action for conversion against Matrix and the
two  individual  defendants,  and for breach of contract,  breach of confidence,
breach of  fiduciary  obligation  and breach of the duty of loyalty  against the
former Collagen employees.  Matrix is alleged to have induced such breaches. The
First Amended  Complaint adds to the requested relief of the original  Complaint
for damages and injunctive relief a request for the imposition of a constructive
trust on the alleged fruits of the alleged trade secret misappropriation.

         The lawsuit follows a series of contract  negotiations in 1994 aimed at
developing a long-term supply relationship between Collagen and Matrix. Although
processes to  manufacture  collagen gel have been in the public  domain for many
years,  Collagen is presently the only commercial source for collagen gel in the
United States.  Prior to developing its own manufacturing  process,  Matrix used
collagen  gel from two  additional  sources in its  clinical  trials,  including
collagen  gel  manufactured  by Koken and by  Collagen.  See "-- No Assurance of
Regulatory Approvals."

         The  Company  believes  that  the  manufacturing  process  which it has
developed for collagen gel does not  incorporate  any Collagen trade secrets and
that the  lawsuit  filed by  Collagen  is without  merit.  Although  the Company
intends to defend  against  this suit  vigorously,  no  assurances  can be given
regarding its eventual  outcome.  This litigation does not involve any claims of
patent infringement. A finding of misappropriation of trade secrets could result
in  damages  and/or  a 

                                                                         Page 14
<PAGE>

significant  restriction on the Company's  ability to manufacture  its products.
Such a finding  would  also  require  the  Company  to alter  its  manufacturing
process,  or seek an alternate source of collagen gel. There can be no assurance
that the Company would be able to alter its manufacturing  process, if required,
in a timely manner,  or at all or that it would be able to secure an alternative
source of collagen gel on commercially  reasonable terms. As a result, there can
be no assurance that this lawsuit will not delay the Company's product approvals
or affect its ability to  manufacture  its products,  each of which would have a
material adverse effect on the Company,  its prospects and financial  condition.
Additionally,  the costs of litigating this matter,  regardless of outcome, will
likely exceed $1,000,000 in 1996.

Uncertainty Regarding Patents and Proprietary Rights

         The Company's  success  depends in part on its ability to obtain patent
protection  for its  products  and to  preserve  its trade  secrets  and operate
without infringing on the proprietary rights of third parties.  No assurance can
be given that the Company's pending patent applications will be approved or that
any patents will provide  competitive  advantages for the Company's  products or
will not be  successfully  challenged or circumvented  by its  competitors.  The
Company has not  conducted an  exhaustive  patent search and no assurance can be
given  that  patents  do not exist or could  not be filed  which  would  have an
adverse  effect on the Company's  ability to market its products or maintain its
competitive position with respect to its products. The Company's patents may not
prevent others from developing  competitive  products using related  technology.
Other companies  obtaining  patents claiming products or processes useful to the
Company may bring  infringement  actions against the Company.  As a result,  the
Company may be required to obtain  licenses from others to develop,  manufacture
or market its products.  There can be no assurance that the Company will be able
to obtain any such licenses on  commercially  reasonable  terms,  if at all. The
Company also relies on trade secrets and proprietary  know-how which it seeks to
protect, in part, by confidentiality agreements with its employees, consultants,
suppliers and licensees.  There can be no assurance that these  agreements  will
not be breached,  that the Company would have adequate  remedies for any breach,
or that the  Company's  trade  secrets  will not  otherwise  become  known or be
independently developed by competitors.

         No  assurance  can be given that any patent  issued to, or licensed by,
the Company will provide  protection that has commercial  significance.  In this
regard,  the patent  position of  pharmaceutical  compounds and  compositions is
particularly uncertain.  Even issued patents may later be modified or revoked by
the United States Patent and Trademark Office ("PTO") in proceedings  instituted
by Matrix or others.  During an  opposition  proceeding  in Japan,  the  Company
became  aware of a  reference  which may affect  the scope of its United  States
Patent  claims  which cover the collagen  gel matrix  products.  The Company has
brought this  reference to the attention of the PTO for a  determination  of the
extent to which the claims  should be  modified in light of this  reference.  No
assurance can be given concerning the outcome of the determination, although the
Company  believes that  modifications of the claims that may be required because
of the reference will not materially adversely affect the Company's  proprietary
protection  for its  products.  In addition,  no assurance can be given that the
Company's  patents  will afford  protection  against  competitors  with  similar
compounds or technologies,  that others will not obtain patents claiming aspects
similar to those covered by the Company's  patents or applications,  or that the
patents of others will not have an adverse  effect on the ability of the Company
to do business.  Moreover,  the Company believes that obtaining  foreign patents
may be more difficult than obtaining  domestic patents because of differences in
patent laws, and recognizes that its patent  position  therefore may be stronger
in the United  States than  abroad.  In  addition,  the  protection  provided by
foreign  patents,  once they are  obtained,  may be weaker than that provided by
domestic patents.

                                                                         Page 15
<PAGE>

Rapid Technological Change and Substantial Competition

         The  pharmaceutical  industry  is  subject  to  rapid  and  substantial
technological   change.   Technological   competition   in  the  industry   from
pharmaceutical and biotechnology companies, universities,  governmental entities
and others  diversifying  into the field is intense and is expected to increase.
Most of these  entities  have  significantly  greater  research and  development
capabilities, as well as substantially more marketing,  financial and managerial
resources,  and represent significant competition for the Company.  Acquisitions
of, or investments in, competing biotechnology companies by large pharmaceutical
companies  could  increase  such  competitors'  financial,  marketing  and other
resources. There can be no assurance that developments by others will not render
the Company's  products or technologies  noncompetitive or that the Company will
be able to keep pace with technological developments. Competitors have developed
or are in the process of developing  technologies that are, or in the future may
be,  the basis for  competitive  products.  Some of these  products  may have an
entirely  different  approach  or means  of  accomplishing  similar  therapeutic
effects than products being developed by the Company.  These competing  products
may be more  effective  and less  costly  than  the  products  developed  by the
Company. In addition, conventional drug therapy, surgery and other more familiar
treatments and modalities will offer competition to the Company's products.

         Any product which the Company  succeeds in developing  and for which it
gains  regulatory  approval must then compete for market  acceptance  and market
share. Accordingly,  important competitive factors, in addition to completion of
clinical  testing and the gaining of regulatory  approval  will include  product
efficacy,  safety,  timing and scope of regulatory  approvals,  availability  of
supply,  marketing and sales  capability,  reimbursement  coverage,  pricing and
patent protection.

Uncertainty of Pharmaceutical Pricing; No Assurance of Adequate Reimbursement

         The future revenues and  profitability  of and  availability of capital
for  biopharmaceutical  companies may be affected by the  continuing  efforts of
governmental  and third  party  payors to  contain or reduce the costs of health
care through various means.  For example,  in certain foreign markets pricing or
profitability of prescription  pharmaceuticals is subject to government control.
In the United States,  there have been, and the Company  expects that there will
continue to be, a number of federal and state  proposals  to  implement  similar
government   control.   While  the  Company  cannot  predict  whether  any  such
legislative  or  regulatory  proposals  will be  adopted,  the  announcement  or
adoption of such proposals could have a material adverse effect on the Company's
prospects. Additionally, the cost of prescription drugs is receiving substantial
attention  in the United  States  Congress.  Legislation  enacted  in 1990,  and
amended and  strengthened  in 1992,  requires  pharmaceutical  manufacturers  to
rebate to the  government a portion of their  revenues  from drugs  furnished to
Medicaid  patients.  In  1992,   legislation  was  enacted  that  extends  these
requirements to cover outpatient pharmaceuticals,  and also mandates a reduction
in pharmaceutical prices charged to certain federally-funded  facilities as well
as to certain hospitals serving a disproportionate share of low-income patients.
It is likely that Congressional  attention will continue to focus on the cost of
drugs  generally,  and particularly on increases in drug prices in excess of the
rate of inflation, given recent government initiatives pertaining to the overall
reform of the U.S.  health  care  system,  and those  specifically  directed  at
lowering  total costs.  The Company  cannot predict the likelihood of passage of
federal and state  legislation  related to health  care reform or lowering  drug
costs.

         The Company's ability to commercialize  its products  successfully will
depend in part on the extent which appropriate reimbursement levels for the cost
of such products and related treatment are obtained from government authorities,
private  health  insurers and other  organizations,  such as health  maintenance
organizations  ("HMOs").  Third-party  payors are  increasingly  challenging the


                                                                         Page 16
<PAGE>

prices  charged for medical  products  and  services.  Also,  the trend  towards
managed  health  care  in  the  United  States  and  the  concurrent  growth  of
organizations  such as HMOs, which could control or significantly  influence the
purchase of health care services and products,  as well as legislative proposals
to reform health care or reduce government insurance programs, may all result in
lower prices for the  Company's  products.  The cost  containment  measures that
health care payors and  providers are  instituting  and the effect of any health
care reform could  adversely  affect the Company's  ability to sell its products
and may have a material adverse effect on the Company.

Dependence Upon Qualified and Key Personnel

         Because  of the  specialized  nature  of the  Company's  business,  the
Company's ability to maintain its competitive position depends on its ability to
attract and retain qualified  management and scientific  personnel.  Competition
for such  personnel is intense.  There can be no assurance that the Company will
be able to continue to attract or retain such persons. The loss of key personnel
or the failure to recruit  additional  personnel  could have a material  adverse
effect on the Company's business.

Product Liability Exposure; Limited Insurance Coverage

         The  Company  faces an  inherent  business  risk of exposure to product
liability  claims in the  event  that the use of  products  during  research  or
commercialization results in adverse effects. While the Company will continue to
attempt to take appropriate precautions,  there can be no assurance that it will
avoid  significant  product  liability  exposure.  The Company maintains product
liability  insurance for clinical  studies.  However,  there can be no assurance
that such  coverage  will be adequate or that  adequate  insurance  coverage for
future  clinical  or  commercial  activities  will be  available  at all,  or at
acceptable  cost,  or  that a  product  liability  claim  would  not  materially
adversely affect the business or financial condition of the Company.

Hazardous Materials and Product Risks

         The Company's  research and development  involves the controlled use of
hazardous  materials,  such as  cytotoxic  drugs,  other toxic and  carcinogenic
chemicals and various radioactive compounds.  Although the Company believes that
its safety  procedures for handling and disposing of such materials  comply with
the standards  prescribed by federal,  state and local regulations,  the risk of
accidental  contamination  or injury from these  materials  cannot be completely
eliminated.  In the event of such an accident,  the Company could be held liable
for any damages that result,  and any such  liability  could be  extensive.  The
Company is also  subject to  substantial  regulation  relating  to  occupational
health and safety,  environmental  protection,  hazardous substance control, and
waste management and disposal. The failure to comply with such regulations could
subject the Company to, among other things, fines and criminal liability.

         Certain of the  chemotherapeutic  agents employed by the Company in its
Therapeutic  Implant,  ADV and Therapeutic  Adhesive  products are known to have
toxic  side  effects,   particularly   when  used  in  traditional   methods  of
administration.  Each product  incorporating such a chemotherapeutic  agent will
require  separate  FDA  approval  as a new drug under the  procedures  specified
above.  Bovine  collagen is a  significant  component of the  Company's  protein
matrix.  Two rare autoimmune  connective  tissue  conditions,  polymyositis  and
dermatomyositis  ("PM/DM"),  have been alleged to occur with increased frequency
in patients  who have  received  cosmetic  collagen  treatments.  Based upon the
occurrence of these conditions, the FDA requested a major manufacturer of bovine
collagen  products for cosmetic  applications  to investigate the safety of such
uses of its collagen.  In October  1991, an expert panel  convened by the FDA to
examine  this issue found no  statistically  significant  relationships  between
injectable  collagen and the  occurrence of autoimmune  disease,  but noted that
certain  limitations  in the  available  data made it  difficult  to establish a
statistically significant association.

                                                                         Page 17
<PAGE>

Volatility of Stock Price; No Dividends

         The market prices for securities of biopharmaceutical and biotechnology
companies  (including the Company) have historically  been highly volatile,  and
the  market  has from time to time  experienced  significant  price  and  volume
fluctuations  that are  unrelated to the  operating  performance  of  particular
companies. Future announcements concerning the Company, its competitors or other
biopharmaceutical products,  governmental regulation,  developments in patent or
other  proprietary  rights,  litigation  or public  concern  as to the safety of
products  developed by the Company or others and general  market  conditions may
have a significant  effect on the market price of the Common Stock.  The Company
has not paid any cash  dividends  on its  Common  Stock and does not  anticipate
paying any dividends in the foreseeable future.

Shares Eligible for Future Sale

         Future sales of shares by existing  stockholders could adversely affect
the prevailing  market price of the Company's  Common Stock. On August 26, 1994,
the Company  sold 13,334  shares of Series A  Convertible  Preferred  Stock (the
"Preferred  Stock") in a private placement,  and registered  1,333,400 shares of
Common Stock issuable upon conversion of the Preferred  Stock.  During the first
quarter of 1996, 13,334  outstanding  shares of the Company's Series A preferred
stock were  converted into 1,333,400  shares of the Company's  common stock.  On
August 29, 1995, the Company sold 1,481,982  shares of Common Stock in a private
placement  and  simultaneously  registered  the  resale  of  such  shares  on  a
Registration  Statement on Form S-3.  The  outstanding  shares of the  Company's
Common Stock are all freely tradeable,  subject to volume and other restrictions
imposed  by Rule  144  under  the  Securities  Act  with  respect  to  sales  by
affiliates.  Sales of  substantial  amounts of Common  Stock may have an adverse
effect on the market price of the Common Stock.

Anti-Takeover Provisions

         The ability of the Board of Directors of the Company to issue shares of
Preferred  Stock  without  stockholder  approval and a  stockholder  rights plan
adopted by the Company may, alone or in combination,  have certain anti-takeover
effects.  The Company  also is subject to  provisions  of the  Delaware  General
Corporation Law which may make certain business combinations more difficult.

                                                                         Page 18
<PAGE>

                           MATRIX PHARMACEUTICAL, INC.

PART II           OTHER INFORMATION


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

The Company's 1996 Annual Meeting of Stockholders  was held on May 16, 1996. The
following  directors,  all of whom served in such capacity prior to the meeting,
were re-elected by the stockholders:

                  J. Stephan Dolezalek
                  Edward E. Luck
                  John E. Lyons
                  Craig R. McMullen
                  Richard D. Murdock
                  Julius L. Pericola
                  Alan E. Salzman

The following additional matters were submitted to the stockholders for vote and
approved at the meeting:

         o    Approval of an amendment to the Company's  1988  Restricted  Stock
              Plan ("the Plan") in order to (1)  increase the maximum  number of
              shares of common stock  authorized  for issuance under the Plan by
              an  additional  850,000  shares and (2)  impose a  specific  share
              limitation of 750,000  shares on the maximum  number of shares for
              which any one  participant may be granted stock options and direct
              stock  issuances under the Plan. Of the total shares voting on the
              foregoing  resolution,  9,507,612 voted in favor,  4,712,619 voted
              against, 16,550 abstained and broker non-votes were 467,850.

         o    Ratification  of the appointment of Ernst and Young as independent
              auditors of the Company  for the fiscal year ending  December  31,
              1996.  Of the total  shares  voting on the  foregoing  resolution,
              14,672,596  voted  in  favor,  19,215  voted  against  and  12,820
              abstained.


                                                                         Page 19
<PAGE>


                           MATRIX PHARMACEUTICAL, INC.


Item 6.  Exhibits and Reports on Form 8-K


                  (a)      Exhibits


Number            Exhibit Table
- ------            -------------

10                Industrial  Multi-Tenant  Lease  agreement dated July 15, 1996
                  between  the  Company,   as  landlord,   and  Advanced  Tissue
                  Sciences, Inc., as tenant.

27                Financial Data Schedule


                  (b)       Reports on Form 8-K


                  The  Company  filed no Current  Reports on Form 8-K during the
                  quarter ended June 30, 1996.


                                                                         Page 20
<PAGE>

                           MATRIX PHARMACEUTICAL, INC.


                                    SIGNATURE




Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.


                           MATRIX PHARMACEUTICAL, INC.





Date:    August  6,  1996            By:       /s/ James R.Glynn
         ----------------                     -----------------------------
                                              James R. Glynn
                                              Senior Vice President, Chief
                                              Financial Officer & Secretary




                               Signing on behalf of the registrant
                               and as principal financial officer


                                                                         Page 21



                  INDUSTRIAL MULTI-TENANT LEASE



                             BETWEEN



                   MATRIX PHARMACEUTICAL, INC.

                            "LANDLORD"




                               AND




                  ADVANCED TISSUE SCIENCES, INC.

                             "TENANT"














                          JULY 15, 1996



<PAGE>

                  INDUSTRIAL MULTI-TENANT LEASE



1.     BASIC PROVISIONS ("BASIC PROVISIONS").

       1.1 PARTIES:  This Lease  ("LEASE"),  dated for reference  purposes only,
July 15, 1996 ("EFFECTIVE DATE"), is made by and between Matrix  Pharmaceutical,
Inc., a Delaware corporation  ("LANDLORD") and Advanced Tissue Sciences, Inc., a
Delaware corporation  ("TENANT")  (collectively the "PARTIES," or individually a
"PARTY").

       1.2(A)  PREMISES:  That certain  portion of the  Building,  including all
improvements  therein  or to be  provided  by  Landlord  under the terms of this
Lease,  commonly known by the street address of 4757 Nexus Centre Drive, located
in the City of San Diego,  County of San Diego,  State of  California,  with zip
code  92121,  as outlined on Exhibit "A"  attached  hereto,  including,  without
limitation, the existing Building elevator ("PREMISES").  The "BUILDING" is that
certain  building   containing  the  Premises  and  generally  described  as  an
approximately  68,000 square foot two-story  Building located in the City of San
Diego  "SR"  zone;  the  Premises  consist  of the  entire  second  floor of the
Building.  In  addition  to  Tenant's  rights to use and occupy the  Premises as
hereinafter  specified,  Tenant  shall have  non-exclusive  rights to the Common
Areas (as defined in Paragraph 2.7 below) as  hereinafter  specified,  but shall
not have any  rights to the roof,  exterior  walls or  utility  raceways  of the
Building or to any other buildings in the Industrial Center.  The Premises,  the
Building, the Common Areas, the land upon which they are located, along with all
other buildings and improvements thereon, are herein collectively referred to as
the "INDUSTRIAL CENTER." (Also see Paragraph 2.)

       (B) PARKING:  One Hundred Five (105)  unreserved  vehicle  parking spaces
("UNRESERVED PARKING SPACES");  and five (5) reserved vehicle parking spaces for
visitors  to the  Industrial  Center  ("RESERVED  PARKING  SPACES").  (Also  see
Paragraph 2.6.)

       1.3 TERM: Two (2) years and no months  ("ORIGINAL  TERM") commencing July
15, 1996  ("COMMENCEMENT  DATE") and ending July 14, 1998  ("EXPIRATION  DATE").
(Also see Paragraph 3 and Addendum A.)

       1.4 EARLY  POSSESSION:  Upon  execution of this Lease ("EARLY  POSSESSION
DATE"). (Also see Paragraphs 3.2 and 3.3.)

       1.5  BASE  RENT:  Months  1-12:  $119,025.00  per  month;  Months  13-24:
$123,786.00 per month ("BASE RENT"). Base Rent shall be payable on the first day
of each month commencing  August 1, 1996. Tenant shall have no obligation to pay
any rent or charges  in excess of the Base Rent  except as  expressly  set forth
herein or as otherwise agreed to in writing by the Parties.  (Also see Paragraph
4 and Addendum A.)

       1.6 BASE RENT PAID UPON EXECUTION: $59,512.50 as Base Rent for the period
July 15, 1996 - July 31, 1996.

       1.7  SECURITY  DEPOSIT:   $89,700.00  ("SECURITY  DEPOSIT").   (Also  see
Paragraph 5.)

       1.8 PERMITTED USE: General office and  administrative  use and scientific
research in compliance  with San Diego "SR" zoning  regulations and no other use
("PERMITTED USE"). (Also see Paragraph 6.)

       1.9 INSURING PARTY. Landlord is the "INSURING PARTY." (Also see Paragraph
8.)

       1.10(A)  REAL  ESTATE  BROKERS.  Brent  Jacobs  of  John  Burnham  &  Co.
represents  Tenant  exclusively  ("TENANT'S  BROKER"),  and no broker represents
Landlord.

       (B) PAYMENT TO BROKERS. Upon the execution of this Lease by both Parties,
Landlord shall pay to Tenant's  Broker a fee as set forth in a separate  written
agreement  between Landlord and Tenant's Broker for brokerage  services rendered
by Tenant's Broker in connection with this transaction.


       1.11  ADDENDA  AND  EXHIBITS.  Attached  hereto is an Addendum or Addenda
consisting of Paragraphs 1 through 14 and Exhibits "A" through "F", all of which
constitute a part of this Lease.

2.     PREMISES, PARKING AND COMMON AREAS.

       2.1 LETTING.  Landlord hereby leases to Tenant,  and Tenant hereby leases
from Landlord,  the Premises,  for the term, at the rental,  and upon all of the
terms,  covenants  and  conditions  set forth in this Lease.  The Premises  will
include the  existing  furnishings  and  equipment  left in the  Premises by the
previous  occupant of the  Premises,  as  specifically  described in Exhibit "C"
("EXISTING  EQUIPMENT"),  which shall  remain the property of Landlord and shall
not be Tenant's Trade Fixtures, equipment or furnishings.

       2.2  CONDITION.  Landlord  shall deliver the Premises to Tenant clean and
free of debris,  floors waxed, carpets cleaned and holes in surfaces of walls in
the Premises  repaired,  on the Commencement Date. On or before the Commencement
Date, Landlord, at Landlord's sole cost and expense, shall commence construction
of a demising wall and doorway at the second floor landing of the stairs leading
to the Premises from the Building main lobby, and promptly after the Commencment
Date Landlord  shall  construct a demising  emergency exit doorway at the top of
the  stairs  leading  to the  Building  exit at the  north  end of the  Building
("LANDLORD'S  WORK").  The  Landlord's  Work shall be  diligently  completed  by
Landlord  in  accordance  with those  certain  construction  plans and  drawings
created by WHL Architects for WHL Architects  Project No. 96144, as Drawing Nos.
A0, A1.0,  A2.1,  A2.2, and A9.1 (a copy of which was received by Tenant on July
12, 1996),  and said demising doors shall be installed by Landlord no later than
ten (10) days after said demising doors are delivered to the Building. By taking
possession of the Premises, Tenant shall be deemed to have acknowledged that (a)
it has inspected the Premises, (b) it accepts the Premises subject to completion
of the Landlord's  Work, and (c) the Premises are in good and sanitary order. As
of the  effective  date of this  Lease,  Tenant  acknowledges  that  Tenant  has
conducted  Tenant's own investigation of the Premises and the physical condition
thereof, including, without limitation,  accessibility and location of utilities
and  improvements  and existence of earthquake  preparedness,  which in Tenant's
judgment  affect  or  influence  Tenant's  use  of  the  Premises  and  Tenant's
willingness to enter this Lease.


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       2.3 COMPLIANCE WITH COVENANTS, RESTRICTIONS AND BUILDING CODE.

                (a) Landlord  warrants that any  improvements  (other than those
constructed by Tenant or at Tenant's  direction) on or in the Premises as of the
Commencement Date shall comply with all applicable  covenants or restrictions of
record and applicable  building  codes,  regulations and ordinances in effect on
the Commencement Date.  Landlord further warrants to Tenant that Landlord has no
knowledge  of any claim  having  been  made by any  governmental  agency  that a
violation or violations of applicable building codes, regulations, or ordinances
exist with regard to the Premises as of the  Commencement  Date. Said warranties
shall  not  apply  to any  Alterations  or  Utility  Installations  (defined  in
Paragraph  7.3(a))  made or to be made by Tenant.  If the Premises do not comply
with said  warranties,  Landlord  shall,  except as  otherwise  provided in this
Lease,  promptly after receipt of written notice from Tenant given within thirty
(30) days after the Tenant's discovery of such  non-compliance and setting forth
with specificity the nature and extent of such non-compliance, take such action,
at  Landlord's  expense,  as may be  reasonable  or  appropriate  to rectify the
non-compliance.   If  Tenant   does  not  give   Landlord   written   notice  of
non-compliance  with the foregoing  warranties within thirty (30) days after the
Tenant's  discovery of such  non-compliance,  correction of that  non-compliance
shall be the  obligation of Tenant at Tenant's  sole cost and expense.  Landlord
makes no warranty  that the  Permitted Use in Paragraph 1.8 is permitted for the
Premises under Applicable Laws (as defined in Paragraph 2.4).

                (b) Tenant shall, at Tenant's sole cost and expense, comply with
all  Applicable  Laws (as defined in Paragraph  2.4) now in force,  or which may
hereafter be in force,  pertaining to Tenant's  particular  use of the Premises,
including,  without  limitation,  the costs and expenses of compliance of any of
Tenant's  Utility  Installations,  or Alterations or additions made by Tenant to
the Premises with all  requirements of Applicable  Laws, and Tenant shall secure
any necessary permits therefor and shall faithfully observe, in the Tenant's use
of the Premises,  Building and Industrial  Center, all Applicable Laws which are
now in force, or which may hereafter be in force.  Notwithstanding the foregoing
sentence,  Landlord  agrees  that  Landlord  shall  be  responsible  for  making
improvements  or  alterations to the  Industrial  Center,  Building and Premises
which  Landlord  is  required  to  maintain  or repair if such  improvements  or
alterations   are  required  by  changes  in  the  Applicable   Laws  after  the
Commencement Date, and are not required as a result of: (i) Tenant's  particular
use or manner of occupancy of the Premises,  Building or Industrial Center; (ii)
Tenant's Utility  Installations or Alterations or additions to the Premises made
by Tenant  (including,  without  limitation,  the installation of Tenant's Trade
Fixtures and  furnishings  in the Premises,  Building or  Industrial  Center) or
(iii)  Tenant's   activities  more  specifically   addressed  in  Paragraph  6.2
(Hazardous Substances).

       2.4 ACCEPTANCE OF PREMISES.  Tenant hereby acknowledges:  (a) that it has
been  advised by the  Tenant's  Broker to  satisfy  itself  with  respect to the
condition of the Premises  (including but not limited to the electrical and fire
sprinkler  systems,  security,  environmental  aspects,  seismic and  earthquake
requirements),  and  compliance  with the Americans  with  Disabilities  Act and
applicable zoning,  municipal,  county,  state and federal laws,  ordinances and
regulations  and  any  covenants  or   restrictions   of  record   (collectively
"APPLICABLE  LAWS") and the present and future  suitability  of the Premises for
Tenant's  intended use; (b) that Tenant has made such  investigation as it deems
necessary with reference to such matters,  is satisfied with reference  thereto,
and  (except  for those  items  that are  specifically  set forth as  Landlord's
responsibility  under  the terms  and  conditions  of this  Lease)  assumes  all
responsibility  therefore  as the  same  relate  to  Tenant's  occupancy  of the
Premises and/or the terms of this Lease; and (c) that neither Landlord,  nor any
of Landlord's agents, has made any oral or written representations or warranties
with respect to said matters other than as set forth in this Lease.

       2.5 INTENTIONALLY DELETED.

       2.6 VEHICLE PARKING. Tenant shall have the non-exclusive right to use the
number of Unreserved Parking Spaces and, for the non-exclusive use of Industrial
Center invitees only, the Reserved  Parking Spaces specified in Paragraph 1.2(b)
on those portions of the Common Areas  designated  from time to time by Landlord
for parking.  Tenant shall not use more  parking  spaces than said number.  Said
parking  spaces  shall be used for  parking by vehicles no larger than full size
passenger  automobiles,  passenger  mini-vans or pick-up  trucks,  herein called
"PERMITTED SIZE VEHICLES."  Vehicles other than Permitted Size Vehicles shall be
parked  and  loaded  or  unloaded  as  directed  by  Landlord  in the  Rules and
Regulations (as defined in Paragraph 40) issued by Landlord. (Also see Paragraph
2.9.)

                (a) Tenant shall not permit or allow any vehicles that belong to
or  are  controlled  by  Tenant  or  Tenant's  employees,  suppliers,  shippers,
customers,  contractors or invitees to be loaded,  unloaded,  or parked in areas
other than those designated by Landlord for such activities.

                (b) If Tenant permits or allows any of the prohibited activities
described  in this  Paragraph  2.6,  then  Landlord  shall have the right,  with
reasonable  notice,  in addition to such other rights and  remedies  that it may
have, to remove or tow away the vehicle  involved and charge the cost to Tenant,
which cost shall be immediately payable upon demand by Landlord.

       2.7 COMMON AREAS - DEFINITION.  The term "COMMON AREAS" is defined as all
areas and facilities  outside the Premises and within the exterior boundary line
of the Industrial  Center and interior utility raceways within the Premises that
are provided and  designated  by the Landlord  from time to time for the general
non-exclusive use of Landlord, Tenant and other tenants of the Industrial Center
and their respective employees, suppliers, shippers, customers,  contractors and
invitees,  including  parking areas,  loading and unloading areas,  trash areas,
roadways,  sidewalks,  walkways,  parkways,  driveways, and landscaped areas. In
addition,  the Common Areas shall  include the  following  areas of the Building
throughout  the Lease Term (but subject to  Landlord's  rights  under  Paragraph
2.10):  the  first-floor  Building  main  entrance  lobby,  patios,  first-floor
lunchroom  (and first floor  showers and  bathroom  facilities),  stairways  and
certain corridors of the Building, all as depicted on Exhibit "A". Tenant hereby
acknowledges  and agrees that the  availability of the  first-floor  showers and
bathroom  facilities  for  Tenant's  use as  part  of the  Common  Areas  may be
terminated  at any time by  Landlord,  if and when  Tenant's  use of such Common
Areas is  reasonably  determined  by Landlord to endanger the ability to use the
first floor of the Building for the  manufacture of  pharmaceutical  products or
otherwise materially  interferes with any lawful use of the first floor premises
of the Building.  Tenant's  access to the Common Areas of the Building may be by
security access cards in accordance with the Rules and Regulations.

       2.8 COMMON AREAS - TENANT'S RIGHTS. Landlord hereby grants to Tenant, for
the  benefit  of Tenant and its  employees,  suppliers,  shippers,  contractors,
customers and invitees,  during the term of this Lease, the non-exclusive  right
to use,  in common with others  entitled to such use,  the Common  Areas as they
exist from time to time, subject to any rights,  powers, and privileges reserved
by  Landlord  under  the  terms  hereof  or under  the  terms of any  Rules  and
Regulations


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or  restrictions   governing  the  use  of  the  Industrial  Center.   Under  no
circumstances  shall the right herein  granted to use the Common Areas be deemed
to include the right to store any property,  temporarily or permanently,  in the
Common  Areas.  Any such storage  shall be permitted  only by the prior  written
consent of Landlord or Landlord's designated agent, which consent may be revoked
at any  time.  In the event  that any  unauthorized  storage  shall  occur  then
Landlord shall have the right,  without notice, in addition to such other rights
and remedies that it may have, to remove the property and charge the  reasonable
cost to Tenant, which cost shall be immediately payable upon demand by Landlord.

       2.9  COMMON  AREAS -  RULES  AND  REGULATIONS.  Landlord  or  such  other
person(s)  as  Landlord  may  appoint  shall  have  the  exclusive  control  and
management  of the Common Areas and shall have the right,  from time to time, to
establish,  modify,  amend and enforce  reasonable  Rules and  Regulations  with
respect  thereto in accordance  with Paragraph 40. Tenant agrees to abide by and
conform  to all  such  Rules  and  Regulations,  and  to  cause  its  employees,
suppliers,  shippers,  customers,  contractors  and  invitees  to so  abide  and
conform.  Landlord  will use its  diligent  efforts  to  enforce  the  Rules and
Regulations,  provided that Landlord  shall not be responsible to Tenant for the
non-compliance  with  said  Rules  and  Regulations  by  other  tenants  of  the
Industrial Center.  Notwithstanding  the foregoing,  Landlord agrees to abide by
and  conform  to all such  Rules and  Regulations,  and to cause its  employees,
suppliers,  shippers,  customers,  contractors  and  invitees  to so  abide  and
conform, in Landlord's occupancy of the Industrial Center. (See Attached Exhibit
"B".)

       2.10 COMMON AREAS - CHANGES.  Landlord  shall have the right,  subject to
the last sentence of this subparagraph, from time to time:

                (a) To make  changes to the  Common  Areas,  including,  without
limitation,  changes  in the  location,  size,  shape and  number of  driveways,
entrances,  parking spaces, parking areas, loading and unloading areas, ingress,
egress, direction of traffic, landscaped areas, walkways and utility raceways;

                (b) To close temporarily any of the Common Areas for maintenance
purposes so long as reasonable access to the Premises remains available;

                (c) To add additional  buildings and  improvements to the Common
Areas;

                (d) To use the Common Areas while  engaged in making  additional
improvements,  repairs or alterations to the Industrial  Center,  or any portion
thereof; and

                (e) To do and  perform  such  other  acts  and make  such  other
changes  in, to or with  respect to the Common  Areas and  Industrial  Center as
Landlord  may,  in  the  exercise  of  sound  business  judgment,   deem  to  be
appropriate.

In exercising  any of the foregoing  rights under this  Paragraph 2.10 regarding
the Common  Area,  (i)  Landlord  shall  make a  reasonable  effort to  minimize
disruption  to  Tenant's  business in the  Premises  and the cost to Tenant as a
result of any such changes,  and (ii) Landlord  shall not  materially  interfere
with Tenant's  Permitted Use in exercising  such rights without first  obtaining
Tenant's consent, which shall not be unreasonably delayed or withheld.

3.     TERM.

       3.1 TERM. The  Commencement  Date,  Expiration  Date and Original Term of
this Lease are as specified in Paragraph 1.3.

       3.2  EARLY  POSSESSION.  If an  Early  Possession  Date is  specified  in
Paragraph 1.4 and if Tenant totally or partially occupies the Premises after the
Early Possession Date but prior to the Commencement  Date, the obligation to pay
Base Rent  shall be abated for the  period of such  early  occupancy;  provided,
however,  that Tenant  shall be  obligated  to pay any and all costs of Building
Services (defined in Paragraph 4.2(a)) associated with such early occupancy. All
other  terms of this Lease,  however  (including,  but not limited to,  Tenant's
obligation  to carry the  insurance  required by Paragraph 8) shall be in effect
during such  period,  and prior to Tenant's  early  occupancy  of the  Premises,
Tenant shall have previously  provided Landlord with proof of Tenant's insurance
as set forth in Paragraph 8 of this Lease.  Any such early  possession shall not
affect  nor  advance  the  Expiration  Date of the  Original  Term.  Any and all
materials, work, installations,  equipment and decorations of any nature brought
upon or installed by Tenant in the Premises prior to the Commencement Date shall
be at Tenant's sole risk.  Except for loss or damage  resulting from  Landlord's
active negligence or willful  misconduct,  neither Landlord nor any party acting
on Landlord's behalf in the Building shall be responsible for any damage or loss
or  destruction  of such items brought to or installed in the Premises  prior to
the Commencement Date.

       3.3 DELAY IN POSSESSION.  If for any reason beyond Landlord's  reasonable
control,  Landlord  cannot  deliver  possession of the Premises to Tenant by the
Early  Possession  Date,  if one is specified  in Paragraph  1.4, or if no Early
Possession Date is specified,  by the Commencement  Date,  Landlord shall not be
subject to any liability therefor, nor shall such failure affect the validity of
this Lease, or the obligations of Tenant  hereunder,  or extend the term hereof,
but in such case,  Tenant shall not,  except as otherwise  provided  herein,  be
obligated to pay rent or perform any other  obligation of Tenant under the terms
of this Lease until Landlord  delivers  possession of the Premises to Tenant. If
possession  of the Premises is not  delivered to Tenant  within thirty (30) days
after the Commencement Date for any reason beyond Landlord's reasonable control,
Tenant may, at its option,  by notice in writing to Landlord within fifteen (15)
days after Landlord's delivery of written notice of a revised  Commencement Date
(which shall be  delivered no later than fifteen (15) days after the  expiration
of such 30-day  period),  cancel this Lease, in which event the parties shall be
discharged from all obligations  hereunder;  provided further,  however, that if
such written  notice of Tenant is not  received by Landlord  within said fifteen
(15) day period,  Tenant's right to cancel this Lease  hereunder shall terminate
and be of no further force or effect.

4.     RENT.

       4.1 BASE RENT.  Tenant shall pay Base Rent, and other rent or charges (if
any), as the same may be adjusted from time to time, to Landlord in lawful money
of the United States, without offset or deduction, on or before the day on which
it is due under the  terms of this  Lease.  Base  Rent,  and all other  rent and
charges (if any),  for any period  during the term hereof which is for less than
one full month  shall be  prorated  based upon the actual  number of days of the
month involved. Payment of Base Rent and other charges shall be made to Landlord
at its address stated herein or to such other persons or at such other addresses
as Landlord may from time to time designate in writing to Tenant.

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       4.2 BUILDING SERVICES.  Landlord shall provide during the term hereof all
Building Services,  as hereinafter  defined, the cost of which services shall be
included  in  Tenant's  Base Rent  (except as  otherwise  specifically  provided
herein), in accordance with the following provisions:

                (a) "BUILDING SERVICES" are defined, for purposes of this Lease,
as all  services to be  performed  by Landlord  relating  to the  ownership  and
operation of the Building and Industrial Center,  including, but not limited to,
the following:

                        (i) The  operation,  repair  and  maintenance,  in neat,
clean, good order and condition, of the following:

                                (aa) The Premises,  subject to the provisions of
Paragraph 7.

                                (bb) The Industrial  Center,  including  parking
areas, loading and unloading areas, trash areas, roadways, sidewalks,  walkways,
parkways,  driveways,  landscaped areas, striping,  bumpers, irrigation systems,
Common Area lighting facilities, fences and gates, elevators and roof.

                                (cc)  Interior  and  exterior  signs  (with  the
exception of Tenant's exterior  identification  signage, which shall be Tenant's
obligation to operate, maintain and repair) and any tenant directories.

                                (dd) Fire detection and sprinkler systems.

                        (ii) The delivery of water,  sewer, gas, and electricity
services to the Building (as described in Paragraph 11), in accordance  with and
subject to the terms and conditions of Paragraph 11.

                        (iii)   Property   management   and  security   services
substantially similar to such services provided on the Effective Date.

                        (iv) Any  environmental  inspections of the Common Areas
as required by Applicable  Requirements  (subject to the terms and conditions of
Paragraph 6.2).

                        (v)  Building  receptionist  services  (as  described in
Paragraph 11.4).

                        (vi)  Building  janitorial  services  (as  described  in
Paragraph 11.3).


                        (vii)  Payment  of Real  Property  Taxes (as  defined in
Paragraph 10.2) to be paid by Landlord for the Industrial  Center,  Building and
the Common Areas under Paragraph 10 hereof.

                        (viii) Obtaining and maintaining the insurance  policies
maintained by Landlord  under  Paragraph 8 hereof with respect to the Industrial
Center.

                        (ix) Any other  services to be provided by Landlord that
are stated elsewhere in this Lease.

                (b) The inclusion of the  improvements,  facilities and services
set forth in  Subparagraph  4.2(a)  shall not be deemed to impose an  obligation
upon Landlord to either have said improvements or facilities or to provide those
services  unless the Industrial  Center already has the same,  Landlord  already
provides the services, or Landlord has agreed elsewhere in this Lease to provide
the same or some of them. Landlord's  maintenance and repair of the Premises and
the  Industrial  Center  shall be performed in such manner and to such extent as
reasonably  deemed by Landlord to be standard for  buildings  of similar  class,
size, age and location.

                (c) The cost of any Building Services,  which are required to be
reimbursed  to  Landlord  under this Lease,  if any,  shall be payable by Tenant
within ten (10) days after a reasonably detailed statement of actual expenses is
presented to Tenant by Landlord.  Any such sum payable by Tenant which would not
otherwise be due until after the date of the  termination of this Lease,  shall,
if the exact amount is uncertain at the time that this Lease terminates, be paid
by such party upon such  termination  in an amount to be  determined by Landlord
with an adjustment to be made once the exact amount is known.

5. SECURITY DEPOSIT.  Tenant shall deposit with Landlord upon Tenant's execution
hereof the Security  Deposit set forth in Paragraph 1.7 as security for Tenant's
faithful  performance of Tenant's  obligations under this Lease. If Tenant fails
to pay Base Rent or other rent or charges due hereunder,  or otherwise  Defaults
under this Lease (as defined in  Paragraph  13.1),  Landlord  may use,  apply or
retain all or any portion of said Security Deposit for the payment of any amount
due Landlord or to reimburse or  compensate  Landlord for any  liability,  cost,
expense, loss or damage (including attorneys' fees) which Landlord may suffer or
incur by reason thereof.  If Landlord uses or applies all or any portion of said
Security  Deposit,  Tenant  shall  within  ten (10) days after  written  request
therefore  deposit  monies with  Landlord  sufficient  to restore said  Security
Deposit  to the full  amount  required  by this  Lease.  Landlord  shall  not be
required  to keep  all or any part of the  Security  Deposit  separate  from its
general  accounts.  Landlord shall, at the expiration or earlier  termination of
the term hereof and after Tenant has vacated the Premises, return to Tenant (or,
at  Landlord's  option,  to the last  assignee,  if any,  of  Tenant's  interest
herein),  that portion of the Security  Deposit not used or applied by Landlord.
Unless  otherwise  expressly  agreed  in  writing  by  Landlord,  no part of the
Security  Deposit shall be  considered to be held in trust,  to bear interest or
other  increment for its use, or to be  prepayment  for any monies to be paid by
Tenant under this Lease.

6.     USE.

       6.1      PERMITTED USE.

                (a)  Tenant  shall  use and  occupy  the  Premises  only for the
Permitted  Use set  forth in  Paragraph  1.8,  or any  other  legal use which is
reasonably comparable thereto, and for no other purpose. Tenant shall not use or
permit the use of the Premises in a manner that is unlawful,  creates waste or a
nuisance,  or that disturbs owners and/or  occupants of, or causes damage to the
Premises  or  neighboring  premises  or  properties.  Tenant  acknowledges  that
neighboring premises of the Building are intended to be used by Landlord for the
manufacture of pharmaceutical products subject to regulation by the federal Food
and Drug Administration  ("FDA").  Tenant hereby warrants and represents that it
shall  cooperate in good faith with  Landlord  (including,  without  limitation,
using  its best  efforts  to comply  with FDA  requests,  rules and  regulations
associated with Landlord's manufacturing of pharmaceutical products) in Tenant's
use of chemicals,  biological and/or  radioactive  materials in the Premises and
any  other  part of the  Industrial  Center.  In the  event  that,  pursuant  to
Landlord's  discussions  with the FDA  regarding the use of the Building for the
manufacture of  pharmaceutical  products,  Landlord  reasonably  determines that
Tenant's   cooperation   pursuant  to  this  Section  6.1(a)  either  materially
interferes  or is  reasonably  likely  to  materially  interfere  with  Tenant's
beneficial  use of all or a part of the  Premises  ("DIMINISHED  USE  PORTION"),
Landlord  agrees  to  promptly  notify  Tenant  of  such  prospective   material
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make a good faith effort to accommodate  Tenant's Permitted Use in the Building.
If Landlord reasonably determines that Landlord's  manufacture of pharmaceutical
products in accordance  with FDA  requirements  cannot be  accomplished  without
material  interference with Tenant's Permitted Use, Landlord shall promptly (but
no later than thirty (30) days after  Landlord's  receipt of a written  decision
from the FDA regarding the effect of Landlord's  manufacturing of pharmaceutical
products in the  Building on Tenant's  Permitted  Use in the  Premises)  provide
Tenant with notice  ("DIMINISHED  USE NOTICE") that: (i) FDA  requirements  will
result  in  such  material  interference,  (ii)  the  nature  of  such  material
interference,   and  (iii)  Landlord's   reasonably   estimated  date  that  FDA
requirements will materially  interfere with Tenant's Permitted Use ("LANDLORD'S
ESTIMATED DATE").  Tenant may, no later than thirty (30) days following the date
of Tenant's receipt of the Diminished Use Notice,  elect to terminate this Lease
as to the  Diminished  Use Portion by delivery of notice to Landlord  ("TENANT'S
TERMINATION  NOTICE"). In the event of such termination pursuant to this Section
6.1(a),  termination  as to the  Diminished Use Portion shall be effective as of
the date that Tenant vacates the Diminished Use Portion. Tenant shall vacate the
Diminished  Use Portion at a date selected by Tenant,  but in no event more than
the later  of:  (i)  ninety  (90) days  after  the date of the  delivery  of the
Tenant's  Termination  Notice to Landlord;  or (ii)  Landlord's  Estimated Date.
Tenant shall  surrender the Diminished Use Portion in accordance  with the terms
and  conditions  of  Paragraph  7.4(c)  of  this  Lease.  Tenant  shall  use its
reasonable  best efforts to keep  Landlord  apprised of the intended date of its
vacation of the Diminished Use Portion.  In the event of a termination by Tenant
under this Section 6.1(a), Landlord shall reimburse Tenant, within ten (10) days
after  Tenant's  delivery  to Landlord  of an  itemized  list of such  expenses,
certified as correct by an authorized  officer of Tenant, all of Tenant's actual
reasonable out-of-pocket expenses arising from said termination, the vacation of
the Diminished Use Portion and Tenant's relocation therefrom, which amount shall
not exceed  Twenty-Five  Thousand  Dollars  ($25,000.00).  In the event that the
Diminished Use Portion  constitutes less than the entire  laboratory  facilities
(as such facilities  existed on the Commencement  Date), from and after the date
of the material  interference with Tenant's  Permitted Use of the Diminished Use
Portion,  the Base  Rent  payable  by  Tenant  hereunder  shall  abate in direct
proportion to the interference with Tenant's beneficial use of the Premises. The
monthly Base Rent for the remaining  Premises (i.e., the original  Premises less
the  Diminished  Use  Portion)  shall be an amount  equal to the sum of: (i) the
square  footage of the remaining  laboratory  facilities  (i.e.  the area of the
laboratory  facilities  in the  Premises  as of the  Commencement  Date less the
Diminished Use Portion of such  laboratory  facilities) at a rate equal to Three
and 85/100 Dollars  ($3.85) per square foot; plus (ii) the square footage of all
other  remaining  portions of the Premises (i.e. the original  Premises less the
area of the laboratory  facilities on the Commencement  Date) at a rate equal to
Three  Dollars  ($3.00) per square foot.  In the event that the  Diminished  Use
Portion constitutes the entire laboratory facilities (as such facilities existed
on the  Commencement  Date),  from and after the date that  Tenant  vacates  the
Diminished  Use  Portion  as set  forth in this  Section  6.1(a),  the Base Rent
payable by Tenant  hereunder  shall  abate such that the  remaining  area of the
Premises  (i.e.  the area of the Premises  less the area of the  Diminished  Use
Premises)  shall  accrue  monthly  Base  Rent at a rate  equal to Three  Dollars
($3.00) per square foot.  From and after the date Tenant  vacates the Diminished
Use Premises the  remaining  area of the Premises  shall be the  "Premises"  for
purposes  of this Lease.  No such  diminution  in use or  election to  terminate
hereunder  shall diminish  Tenant's  obligations to cooperate under this Section
6.1(a).  Notwithstanding the foregoing,  in the event such material reduction of
Tenant's beneficial use of the Premises occurs during the last six (6) months of
the term of this  Lease and  Tenant  elects to  terminate  this  Lease as to the
Diminished Use Portion,  Landlord may, at Landlord's Option, terminate the Lease
in its  entirety  effective  thirty  (30) days  following  the date of  Tenant's
termination notice. Provided, however, if Tenant at that time has an exercisable
option to extend  this  Lease or to  purchase  the  Premises,  then  Tenant  may
preserve this Lease by exercising such option.

                (b) Tenant's use and occupancy of the Premises shall not subject
the Premises to any use which would tend to damage any portion  thereof or which
may in any way cause any  cancellation  of any  insurance  policy  covering  the
Industrial  Center,  the Building or portion  thereof.  Tenant shall also comply
with Rules and Regulations governing the use of the Building.  Landlord,  during
the period of its  occupancy of any premises in the  Building,  hereby agrees to
comply with such Rules and Regulations in its occupancy of the Building.

                (c) Landlord hereby agrees to not unreasonably withhold or delay
its consent to any written request by Tenant,  Tenant's assignees or subtenants,
and by  prospective  assignees  and  subtenants  of Tenant,  its  assignees  and
subtenants,  for a modification  of said Permitted Use, so long as the same will
not impair the structural  integrity of the  improvements  on the Premises or in
the Building or the mechanical or electrical systems therein,  does not conflict
with uses by other tenants, is not significantly more burdensome to the Premises
or the  Building and the  improvements  thereon,  and is  otherwise  permissible
pursuant to this  Paragraph  6. If Landlord  elects to  withhold  such  consent,
Landlord  shall within five (5) business  days after such request give a written
notification  of same,  which notice shall include an  explanation of Landlord's
reasonable objections to the change in use.

       6.2      HAZARDOUS SUBSTANCES.

                (a)  REPORTABLE  USES  REQUIRE  CONSENT.   The  term  "HAZARDOUS
SUBSTANCE"  as used in this Lease shall mean any product,  substance,  chemical,
material  or  waste  whose  presence,   nature,  quantity  and/or  intensity  of
existence, use, manufacture, disposal, transportation, spill, release or effect,
either by itself or in combination  with other  materials  expected to be on the
Premises,  is either: (i) potentially  injurious to the public health, safety or
welfare,  the environment,  or the Premises;  (ii) regulated or monitored by any
governmental  authority; or (iii) a basis for potential liability of Landlord to
any  governmental  agency or third party under any applicable  statute or common
law  theory.   Hazardous  Substance  shall  include,  but  not  be  limited  to,
hydrocarbons,  petroleum,  gasoline,  crude oil or any  products or  by-products
thereof.  Subject  to the  following  sentence,  Tenant  shall not engage in any
activity  in or about  the  Premises  which  constitutes  a  Reportable  Use (as
hereinafter  defined) of Hazardous  Substances without the express prior written
consent  of  Landlord  (which  consent  shall  not be  unreasonably  delayed  or
withheld) and  compliance in a timely manner (at Tenant's sole cost and expense)
with all  Applicable  Requirements  (as  defined  in  Paragraph  6.3).  Landlord
acknowledges and agrees that, as of the Commencement  Date, Tenant may use those
certain  Hazardous  Substances  listed on  Exhibit  "D" in  accordance  with all
Applicable  Requirements and the relevant provisions of this Lease.  "REPORTABLE
USE" shall mean (i) the installation or use of any above or below ground storage
tank, (ii) the generation, possession, storage, use, transportation, or disposal
of a Hazardous Substance that requires a permit from, or with respect to which a
report, notice,  registration or business plan is required to be filed with, any
governmental authority, and (iii) the presence in, on or about the Premises of a
Hazardous  Substance  with respect to which any  Applicable  Laws require that a
notice be given to persons  entering or occupying  the  Premises or  neighboring
properties.  Notwithstanding the foregoing, Tenant may, without Landlord's prior
consent,  but upon  notice to Landlord  and in  compliance  with all  Applicable
Requirements, use any ordinary and customary materials reasonably required to be
used by Tenant in the normal course of the Permitted Use, so long as such use is
not a Reportable Use and does not expose the Premises or neighboring  properties
to any meaningful risk of contamination or

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damage or expose Landlord to any liability therefor.  In addition,  Landlord may
(but without any  obligation to do so)  condition its consent to any  Reportable
Use of any  Hazardous  Substance by Tenant upon  Tenant's  giving  Landlord such
additional assurances as Landlord, in its reasonable discretion, deems necessary
to protect itself, the public, the Premises and the environment  against damage,
contamination or injury and/or liability therefor,  including but not limited to
the  installation  (and,  at  Landlord's  option,  removal  on or  before  Lease
expiration  or  earlier   termination)   of  reasonably   necessary   protective
modifications to the Premises (such as concrete  encasements) and/or the deposit
of an additional Security Deposit under Paragraph 5 hereof.

                (b) DUTY TO INFORM LANDLORD.  If Tenant knows, or has reasonable
cause to  believe,  that a  Hazardous  Substance  has come to be located in, on,
under or about the  Premises or the Building due to acts or omissions of Tenant,
its  agents,  employees,  invitees,  licensees  or  contractors,  other  than as
previously  consented to by Landlord,  which consent  shall not be  unreasonably
delayed or withheld,  Tenant shall  immediately  give  Landlord  written  notice
thereof,  together with a copy of any statement,  report, notice,  registration,
application,  permit, business plan, license, claim, action, or proceeding given
to, or received from, any governmental authority or private party concerning the
presence, spill, release, discharge of, or exposure to, such Hazardous Substance
including  but not  limited  to all such  documents  as may be  involved  in any
Reportable  Use  involving  the  Premises.  Tenant shall not cause or permit any
Hazardous  Substance  to be  spilled  or  released  in,  on,  under or about the
Premises (including,  without limitation, through the plumbing or sanitary sewer
system), except in compliance with all Applicable Requirements.

                (c) INDEMNIFICATION. Tenant shall indemnify, protect, defend and
hold Landlord, its agents, employees, lenders and ground lessor, if any, and the
Premises, harmless from and against any and all damages, liabilities, judgments,
costs,  claims,  liens,  expenses,  penalties,  loss of permits  and  reasonable
attorneys'  and  consultants'  fees  arising out of or involving  any  Hazardous
Substance brought onto the Industrial Center by or for Tenant or by anyone under
Tenant's  control.  Tenant's  obligations  under  this  Paragraph  6.2(c)  shall
include,  but not be limited to, the effects of any  contamination  or injury to
person,  property or the environment created or suffered by Tenant, and the cost
of  investigation  (including  reasonable  consultants'  and attorneys' fees and
testing), removal, remediation,  restoration and/or abatement thereof, or of any
contamination  therein  involved,  and shall  survive the  expiration or earlier
termination of this Lease.  No termination,  cancellation  or release  agreement
entered into by Landlord and Tenant shall  release  Tenant from its  obligations
under this Lease with respect to Hazardous  Substances,  unless  specifically so
agreed by  Landlord  in writing at the time of such  agreement.  Landlord  shall
indemnify,  protect,  defend and hold Tenant,  its agents and employees harmless
from and against any and all damages,  liabilities,  judgments,  costs,  claims,
liens,  expenses,  penalties,  loss of permits  and  reasonable  attorneys'  and
consultants'  fees arising out of or involving any Hazardous  Substance  brought
onto the  Industrial  Center by or for  Landlord or by anyone  under  Landlord's
control.  Subject to the  provisions  of Section 8 of Addendum  "A",  Landlord's
obligations  under this Paragraph  6.2(c) shall include,  but not be limited to,
the  effects  of  any  contamination  or  injury  to  person,  property  or  the
environment  created or  suffered  by  Landlord,  and the cost of  investigation
(including  reasonable  consultants' and attorneys' fees and testing),  removal,
remediation,  restoration  and/or  abatement  thereof,  or of any  contamination
therein  involved,  and shall survive the  expiration or earlier  termination of
this Lease. No termination,  cancellation or release  agreement  entered into by
Landlord and Tenant shall release Landlord from its obligations under this Lease
with respect to Hazardous Substances, unless specifically so agreed by Tenant in
writing at the time of such agreement.

                (d) TENANT'S  COMPLIANCE  WITH  REQUIREMENTS.  Tenant shall,  at
Tenant's sole cost and expense, fully, diligently and in a timely manner, comply
with all "APPLICABLE REQUIREMENTS," which term is used in this Lease to mean all
laws,  rules,  regulations,  ordinances,  directives,  covenants,  easements and
restrictions  of  record,  permits,  the  requirements  of any  applicable  fire
insurance  underwriter or rating bureau,  and the reasonable  recommendations of
Landlord's  engineers and/or consultants (to the extent such recommendations are
intended to protect any person or property outside the Premises, or are required
to avoid a Landlord  breach of any  Security  Device,  as  defined in  Paragraph
30.1),  relating  in any  manner to the  Tenant's  use and/or  occupancy  of the
Building or the  activities  of Tenant or anyone under  Tenant's  control in the
Industrial  Center  (including  but not  limited  to matters  pertaining  to (i)
industrial  hygiene,  (ii)  environmental  conditions on, in, under or about the
Premises,  including  soil  and  groundwater  conditions,  and  (iii)  the  use,
generation,  manufacture,   production,   installation,   maintenance,  removal,
transportation,  storage, spill, or release of any Hazardous Substance),  now in
effect or which may hereafter  come into effect.  Tenant shall,  within five (5)
days after receipt of Landlord's  written request,  provide Landlord with copies
of all  documents  and  information,  including  but  not  limited  to  permits,
registrations,  manifests,  applications,  reports and certificates,  evidencing
Tenant's compliance with any Applicable  Requirements specified by Landlord, and
shall  immediately upon receipt,  notify Landlord in writing (with copies of any
documents  involved)  of any  threatened  or  actual  claim,  notice,  citation,
warning, complaint or report pertaining to or involving failure by Tenant or the
Premises to comply with any Applicable Requirements.

                (e)  INSPECTION;   COMPLIANCE  WITH  LAW.  Landlord,  Landlord's
agents, employees,  contractors and designated representatives,  and the holders
of any  mortgages,  deeds of trust or ground leases on the Premises  ("LENDERS")
shall  have  the  right  to  enter  the  Premises  at any time in the case of an
emergency  (provided that Landlord shall give Tenant notice of Landlord's  entry
into the Premises promptly after such entry),  and otherwise at reasonable times
and upon reasonable  advance notice, for the purpose of inspecting the condition
of the Premises and for  verifying  compliance by Tenant with this Lease and all
Applicable  Requirements (as defined in Paragraph 6.2(d)), and Landlord shall be
entitled to employ experts and/or consultants in connection  therewith to advise
Landlord with respect to Tenant's activities relating to Tenant's  installation,
operation, use, monitoring,  maintenance,  or removal of any Hazardous Substance
on or from the  Premises.  Except in the case of an  emergency,  Tenant shall be
permitted  to  have a  representative  of  Tenant  accompany  such  inspections,
provided that the non-availability of a Tenant representative shall not delay or
prevent  Landlord from performing such an inspection.  The costs and expenses of
any  such  inspections  shall be paid by the  party  requesting  same,  unless a
Default  or  Breach  of this  Lease  by  Tenant  or a  violation  of  Applicable
Requirements or a contamination,  caused or materially contributed to by Tenant,
is found to exist or to be imminent,  or unless the  inspection  is requested or
ordered  by a  governmental  authority  as the  result of any such  existing  or
imminent  violation or  contamination.  In such case,  Tenant shall upon request
reimburse  Landlord or  Landlord's  Lender,  as the case may be, for  Landlord's
actual costs and expenses of such inspections reasonably incurred by Landlord.



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7.     MAINTENANCE,   REPAIRS,   UTILITY   INSTALLATIONS,   TRADE  FIXTURES  AND
ALTERATIONS.

       7.1      TENANT'S OBLIGATIONS.

                (a) Subject to the provisions of Paragraphs 2.2 (Condition), 2.3
(Compliance  with  Covenants,  Restrictions  and Building  Code),  4.2 (Building
Services),  7.2  (Landlord's  Obligations),  9 (Damage or  Destruction),  and 14
(Condemnation),  Tenant  shall not  commit  or suffer  any waste or damage to be
committed  on any portion of the  Premises,  Building or  Industrial  Center and
shall enforce reasonable  workplace  operating  practices in order to reasonably
reduce  the  likelihood  of waste or  damage  to any  portion  of the  Premises,
Building and Industrial  Center,  including,  without  limitation,  all Building
equipment  and  systems.   Notwithstanding  Landlord's  repair  and  maintenance
obligations  in Paragraph  7.2,  Landlord  shall not be obligated to pay for any
maintenance, repairs or replacements of any portion of the Premises, Building or
Industrial  Center that are  required as a result of the  negligence  or willful
misconduct of Tenant, its agents, employees, invitees, licensees or consultants,
which shall be the responsibility of Tenant, at Tenant's cost (subject, however,
to the  availability  of insurance  coverage  for any such  repairs  pursuant to
Paragraph 8, in which case Tenant's  payment  obligation shall be limited to the
amount  of  the  deductible  paid  by  Landlord   arising  from  such  repairs).
Notwithstanding the foregoing,  Tenant's repair and maintenance obligations with
respect to the Premises shall include, without limitation, any necessary repairs
to: (1) any carpet or other floor covering installed by Tenant, (2) any interior
partitions and other Existing  Equipment in the Premises,  (3) any holes made by
Tenant to any Building  walls,  (4) any telephone and computer  cabling  serving
Tenant  exclusively,  (5) any of Tenant's Trade  Fixtures  (defined in Paragraph
7.3(a)),  and (6) any  Tenant-Owned  Alterations  and/or  Utility  Installations
(defined in Paragraph 7.3(a)).

                (b) If Tenant fails to perform Tenant's  obligations  under this
Paragraph  7.1.  Landlord may enter upon the Premises after ten (10) days' prior
written notice to Tenant  (except in the case of an emergency,  in which case no
notice shall be required),  and at Tenant's expense, perform such obligations on
Tenant's behalf,  and put the Premises in good order,  condition and repair,  in
accordance with Paragraph 13.2 below.

       7.2 LANDLORD'S  OBLIGATIONS.  Subject to the provisions of Paragraphs 2.2
(Condition),  2.3 (Compliance  with Covenants,  Restrictions and Building Code),
4.2 (Building Services), 6 (Use), 7.1 (Tenant's Obligations), 7.4(c) (Surrender/
Restoration),  9 (Damage or Destruction) and 14  (Condemnation),  Landlord shall
keep in good order, condition and repair the plumbing, heating,  ventilation and
air-conditioning,   electrical  and  mechanical  systems,  lighting  facilities,
windows,  doors and plate glass of the Building and the Industrial  Center,  and
the foundations, exterior walls, structural condition of interior bearing walls,
exterior roof,  fire sprinkler  and/or  standpipes and hoses or other  automatic
fire extinguishing  system,  including fire alarm and/or smoke detection systems
and  equipment,  fire hydrants,  parking lots,  walkways,  parkways,  driveways,
landscaping,  fences,  signs and utility  systems  serving the  Building and all
parts thereof as well as providing the Building  Services  pursuant to Paragraph
4.2., but excluding any items which are the responsibility of Tenant pursuant to
Paragraph 7.1 above.  Tenant  expressly waives the benefit of any statute now or
hereafter  in effect  which  would  otherwise  afford  Tenant  the right to make
repairs at Landlord's  expense or to terminate  this Lease because of Landlord's
failure to keep the Building,  Industrial  Center or Common Areas in good order,
condition and repair.

       7.3 UTILITY INSTALLATIONS, TRADE FIXTURES, ALTERATIONS.

                (a)   DEFINITIONS;   CONSENT   REQUIRED.   The   term   "UTILITY
INSTALLATIONS"  is used in this Lease to refer to all air lines,  power  panels,
electrical  distribution,  security and fire protection systems,  communications
systems, lighting fixtures, heating, ventilating and air conditioning equipment,
plumbing,  and fencing in, on or about the Premises.  The term "TRADE  FIXTURES"
shall mean Tenant's  machinery and equipment  which can be removed without doing
material  damage  to  the  Premises.  The  term  "ALTERATIONS"  shall  mean  any
modification of the  improvements on the Premises which are provided by Landlord
under  the  terms of this  Lease,  other  than  Utility  Installations  or Trade
Fixtures. "TENANT-OWNED ALTERATIONS AND/OR UTILITY INSTALLATIONS" are defined as
Alterations  and/or Utility  Installations made by Tenant that are not yet owned
by Landlord pursuant to Paragraph 7.4(a).  Tenant shall not make nor cause to be
made any  Alterations  or  Utility  Installations  in,  on,  under or about  the
Premises without  Landlord's prior written consent.  Tenant may,  however,  make
non-structural  Alterations and/or Utility  Installations to the interior of the
Premises  (excluding  the roof)  without  Landlord's  consent but upon notice to
Landlord,  so long as they are not visible from the outside of the Premises,  do
not involve  puncturing,  relocating or removing the roof or any existing walls,
or changing or interfering with the fire sprinkler or fire detection systems and
the  cumulative  cost thereof during the term of this Lease as extended does not
exceed $25,000.00.

                (b)  CONSENT.  Any  Alterations  or Utility  Installations  that
Tenant shall desire to make and which require the consent of the Landlord  shall
be presented to Landlord in written form with detailed plans. Any consents given
by Landlord  pursuant to Subparagraph  7.3(a) shall be deemed  conditioned upon:
(i)  Tenant's   acquiring  all  applicable   permits  required  by  governmental
authorities;  (ii) the furnishing of copies of such permits together with a copy
of the plans and  specifications  for the Alteration or Utility  Installation to
Landlord prior to commencement of the work thereon;  and (iii) the compliance by
Tenant with any conditions of said permits in a prompt and  expeditious  manner.
Any Alterations or Utility Installations by Tenant during the term of this Lease
shall  be done in a good  and  workmanlike  manner,  with  good  and  sufficient
materials, and be in compliance with all Applicable  Requirements.  Tenant shall
promptly upon  completion  thereof  furnish  Landlord  with  as-built  plans and
specifications  therefor.  Landlord  may  (but  without  obligation  to  do  so)
condition its consent to any requested  Alteration or Utility  Installation that
costs  more than the  amount  of the  Security  Deposit  held by  Landlord  upon
Tenant's  providing  Landlord with a lien and completion bond in an amount equal
to one and  one-half  times the  estimated  cost of such  Alteration  or Utility
Installation.

                (c) LIEN  PROTECTION.  Tenant  shall pay when due all claims for
labor or materials  furnished or alleged to have been furnished to or for Tenant
at or  for  use on the  Premises,  which  claims  are or may be  secured  by any
mechanic's or materialmen's  lien against the Premises or any interest  therein.
Tenant  shall give  Landlord  not less than ten (10) days'  notice  prior to the
commencement of any work in, on, or about the Premises,  and Landlord shall have
the  right  to post  notices  of  non-responsibility  in or on the  Premises  as
provided by law. If Tenant  shall,  in good faith,  contest the  validity of any
such lien, claim or demand,  then Tenant shall, at its sole expense,  defend and
protect  itself,  Landlord and the  Premises  against the same and shall pay and
satisfy  any such  adverse  judgment  that may be  rendered  thereon  before the
enforcement  thereof  against the Landlord or the  Premises.  If Landlord  shall
require, Tenant shall furnish to Landlord a surety bond satisfactory to Landlord
in an amount equal to one and one-half  times the amount of such  contested lien
claim or  demand,  indemnifying  Landlord  against  liability  for the same,  as
required  by law for the  holding of the  Premises  free from the effect of such
lien or claim.  In  addition,  Landlord  may  require  Tenant to pay  Landlord's
attorneys'  fees and costs in  participating  in such action if  Landlord  shall
reasonably decide it is in its best interest to do so.



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                (d) LANDLORD'S ALTERATIONS.  Landlord may at any time during the
Term of this Lease,  upon at least  thirty (30) days advance  written  notice to
Tenant,  install  air-handling  ducting in the Premises in  accordance  with the
preliminary  plans  attached  hereto  and  incorporated  herein as  Exhibit  "E"
("LANDLORD'S ALTERATIONS"). Landlord hereby agrees, as a condition to Landlord's
continued  ability to perform  such work in the  Premises,  to  coordinate  with
Tenant's  designated  representative  in making  Landlord's  Alterations  in the
Premises in such a manner and at such times as Tenant may reasonably  request in
order to minimize the  disruption of Tenant's use of the Premises.  Landlord and
Tenant hereby agree to act in good faith to permit Landlord's  Alterations to be
completed in a timely manner.

       7.4      OWNERSHIP, REMOVAL, SURRENDER, AND RESTORATION.

                (a)  OWNERSHIP.  Subject to  Landlord's  right to require  their
removal and to cause Tenant to become the owner thereof as hereinafter  provided
in this Paragraph 7.4, all  Alterations  and Utility  Installations  made to the
Premises by Tenant shall be the property of and owned by Tenant,  but considered
a part of the Premises.  Landlord  may, at any time and at its option,  elect in
writing  to  Tenant  to be  the  owner  of  all or  any  specified  part  of the
Tenant-Owned  Alterations  and Utility  Installations.  Except for  Tenant-owned
communications  systems (which shall be identified in writing to Landlord at the
time such  Utility  Installations  are  installed  in the  Premises)  and unless
otherwise   instructed  per   Subparagraph   7.4(b)  hereof,   all  Tenant-Owned
Alterations  and  Utility  Installations  shall,  at the  expiration  or earlier
termination  of this Lease,  become the property of Landlord and remain upon the
Premises and be surrendered with the Premises by Tenant.

                (b) REMOVAL. Unless otherwise agreed in writing at the time such
Alterations or Utility  installations are installed in the Premises  (regardless
of whether  Landlord  consent  for such  Tenant-Owned  Alterations  and  Utility
Installations is required under Subparagraph 7.3(b)),  Landlord may require that
any or all Tenant-Owned  Alterations or Utility  Installations be removed by the
expiration  or earlier  termination  of this Lease,  notwithstanding  that their
installation  may have been  consented to by Landlord.  Landlord may require the
removal  at any  time  of  all  or  any  part  of  any  Alterations  or  Utility
Installations made without the required consent of Landlord.

                (c)  SURRENDER/RESTORATION.  Pursuant to Tenant's obligations in
Section 7.1(a) to enforce reasonable workplace operating practices, Tenant shall
surrender  the  Premises  by the end of the  last day of the  Lease  term or any
earlier  termination  date,  clean and free of debris and (subject to Landlord's
maintenance  requirements in Section 7.2) in good operating order, condition and
state of repair, ordinary wear and tear, Premises Partial Damage, Premises Total
Destruction and condemnation excepted.  Ordinary wear and tear shall not include
any damage or deterioration caused by waste or that would have been prevented by
Tenant's  enforcement of reasonable  workplace  operating practices or by Tenant
otherwise  performing all of its obligations under this Lease.  Except as agreed
or specified herein, the Premises, as surrendered, shall include the Alterations
and Utility Installations.  The obligation of Tenant shall include the repair of
any damage  occasioned by the  installation,  maintenance or removal of Tenant's
Trade Fixtures furnishings,  equipment, and Tenant-Owned Alterations and Utility
Installations  as well as the removal of any storage  tank  installed  by or for
Tenant, and the removal,  replacement,  or remediation of any soil,  material or
ground  water  contaminated  by Tenant  as may then be  required  by  Applicable
Requirements  and/or good  practice.  Tenant's  Trade  Fixtures shall remain the
property of Tenant and shall be removed by Tenant  subject to its  obligation to
repair and restore the Premises per this Lease.

8.     INSURANCE; INDEMNITY.

       8.1  PAYMENT OF  PREMIUMS.  Subject to the  provisions  of  Subparagraphs
8.3(b),  8.3(c) and 8.5,  the cost of the premiums  for the  insurance  policies
maintained by Landlord under this Paragraph 8 shall be included as a cost of the
Building Services pursuant to Paragraph 4.2 hereof.

       8.2      LIABILITY INSURANCE.

                (a)  CARRIED BY TENANT.  Tenant  shall  obtain and keep in force
during the term of this Lease a Commercial General Liability policy of insurance
protecting Tenant,  Landlord and any Lender(s) whose names have been provided to
Tenant in writing (as  additional  insureds)  against  claims for bodily injury,
personal injury and property damage based upon,  involving or arising out of the
ownership,  use,  occupancy  or  maintenance  of  the  Premises  and  all  areas
appurtenant  thereto.  Such insurance shall be on an occurrence  basis providing
combined  single  limit  coverage  in an  amount  not less than  $1,000,000  per
occurrence,  and not less than  $5,000,000  excess  umbrella  coverage,  with an
"ADDITIONAL  INSURED-MANAGERS OR LANDLORDS OF PREMISES"  endorsement and contain
the  "AMENDMENT OF THE  POLLUTION  EXCLUSION"  endorsement  for damage caused by
heat,  smoke or fumes from a hostile  fire.  The policy  shall not  contain  any
intra-insured exclusions as between insured persons or organizations,  but shall
include  cross-liability  endorsements for Tenant's liability assumed under this
Lease  as an  "insured  contract"  for the  performance  of  Tenant's  indemnity
obligations  under this  Lease.  The limits of said  insurance  required by this
Lease or as carried by Tenant shall not, however,  limit the liability of Tenant
nor relieve Tenant of any obligation  hereunder.  All insurance to be carried by
Tenant  shall be  primary to and not  contributory  with any  similar  insurance
carried by Landlord,  whose insurance shall be considered excess insurance only.
Provided  that  such  form of  coverage  shall not  materially  affect  Tenant's
obligations under the foregoing  requirements,  the policy of insurance required
under this Paragraph 8.2(a) may be in the form of a so-called  blanket policy of
broad form commercial general liability insurance with the same coverage for the
Premises  as  described  above,  as well  as  coverage  of  other  premises  and
properties of Tenant, or in which Tenant has some interest.

                (b) CARRIED BY LANDLORD.  In addition to and not in lieu of, the
insurance  required to be  maintained  by Tenant  described in Paragraph  8.2(a)
above,  Landlord  shall also  maintain in force  during the term of this Lease a
Commercial General Liability policy of insurance protecting Landlord, and Tenant
(as an additional insured) against claims for bodily injury, personal injury and
property  damage  based upon,  involving or arising out of the  ownership,  use,
occupancy or maintenance of the Industrial Center. Such insurance shall be on an
occurrence basis providing  combined single limit coverage in an amount not less
than  $1,000,000 per occurrence,  and not less than  $5,000,000  excess umbrella
coverage.  Landlord's obligations to carry the insurance set forth herein may be
satisfied by coverage under a so-called  blanket policy of broad form commercial
general liability insurance with the same coverage for the Premises as described
above,  as well as coverage of other premises and properties of Landlord,  or in
which Landlord has some interest.



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       8.3 PROPERTY INSURANCE-BUILDING, IMPROVEMENTS AND RENTAL VALUE.

                (a) BUILDING AND IMPROVEMENTS. Landlord shall obtain and keep in
force  during  the  term of this  Lease a  policy  or  policies  in the  name of
Landlord,  with loss payable to Landlord and to any Lender(s),  insuring against
loss or damage to the Building.  Such  insurance  shall be for full  replacement
cost, as the same shall exist from time to time,  or the amount  required by any
Lender(s),  but in no event more than the commercially  reasonable and available
insurable  value  thereof  by  reason  of  the  unique  nature  or  age  of  the
improvements involved, if such latter amount is less than full replacement cost.
Tenant-Owned Alterations and Utility Installations,  Trade Fixtures and Tenant's
personal  property shall be insured by Tenant  pursuant to Paragraph 8.4. If the
coverage is available and commercially appropriate Landlord's policy or policies
shall insure  against all risks of direct  physical  loss or damage  (except the
perils of flood  and/or  earthquake  unless  required  by a  Lender),  including
coverage for any additional  costs  resulting from debris removal and reasonable
amounts of coverage for the  enforcement  of any ordinance or law regulating the
reconstruction or replacement of any undamaged sections of the Building required
to be  demolished  or  removed  by reason of the  enforcement  of any  building,
zoning,  safety  or land  use  laws as the  result  of a  covered  loss  but not
including plate glass  insurance.  Said policy or policies shall also contain an
agreed  valuation  provision  in  lieu of any  co-insurance  clause,  waiver  of
subrogation,  and inflation guard  protection  causing an increase in the annual
property  insurance  coverage  amount by a factor of not less than the  adjusted
U.S.  Department  of Labor  Consumer  Price Index for All Urban  Consumers,  Los
Angeles-Anaheim-Riverside (1982-84=100).

                (b) RENTAL  VALUE.  Landlord  may also  obtain and keep in force
during the term of this Lease a policy or policies in the name of Landlord, with
loss payable to Landlord and any Lender(s), insuring the loss of the full rental
and other  charges  payable by all tenants of the  Building to Landlord  for one
year.  Said  insurance  may provide that in the event the Lease is terminated by
reason of an insured loss,  the period of indemnity  for such coverage  shall be
extended  beyond the date of the  completion  of repairs or  replacement  of the
Premises,  to provide for one full year's loss of rental  revenues from the date
of any such loss. Said insurance shall contain an agreed valuation  provision in
lieu of any  co-insurance  clause,  and the amount of coverage shall be adjusted
annually to reflect the projected rental income, Real Property Taxes,  insurance
premium  costs and  other  expenses,  if any,  otherwise  payable,  for the next
12-month period.

                (c) INSURANCE  COSTS  INCREASES.  Tenant shall pay any Insurance
Cost Increase to Landlord as an additional charge hereunder. As used herein, the
term  "INSURANCE COST INCREASE" is defined as any increase in the actual cost of
the insurance  applicable to the Industrial Center and required to be carried by
Landlord pursuant to Paragraphs 8.3(a) and 8.3(b) ("REQUIRED  INSURANCE"),  over
and above the Base  Premium,  as  hereinafter  defined,  calculated on an annual
basis,  as a result of Tenant's use of the Premises.  "Insurance  Cost Increase"
shall not  include  requirements  of the holder of a  mortgage  or deed of trust
covering the Premises,  increased  valuation of the  Premises,  and/or a general
premium  rate  increase  unless  such  requirements  are  imposed as a result of
Tenant's acts, omissions, use or occupancy of the Premises and/or its activities
in the Industrial  Center.  The term  "Insurance  Cost Increase"  shall also not
include any premium increases  resulting from the nature of the occupancy of any
other tenant of the  Building.  The "BASE  PREMIUM"  shall be the lowest  annual
premium reasonably  obtainable for the Required Insurance as of the Commencement
Date, assuming the intended and full use of the Building.  In no event, however,
shall Tenant be responsible for any portion of the premium cost  attributable to
liability  insurance  coverage  procured by  Landlord  under  Paragraph  8.2(b).
Premiums for policy periods  commencing prior to, or extending beyond,  the term
of this Lease shall be prorated to coincide with the corresponding  Commencement
Date or Expiration Date.

                (d)  TENANT'S  IMPROVEMENTS.  Landlord  shall not be required to
insure  Tenant-Owned  Alterations and Utility  Installations  unless the item in
question has become the property of Landlord under the terms of this Lease.

       8.4 TENANT'S PROPERTY INSURANCE. Subject to the requirements of Paragraph
8.5,  Tenant at its cost shall either by separate  policy or by endorsement to a
policy already carried,  maintain insurance coverage on all of Tenant's personal
property,  Trade Fixtures and Tenant-Owned Alterations and Utility Installations
in, on, or about the Premises similar in coverage to that carried by Landlord as
the  Insuring  Party  under  Paragraph  8.3(a).  Such  insurance  shall  be full
replacement   cost  coverage  with  a  deductible  not  to  exceed  $10,000  per
occurrence.  Upon request from  Landlord,  Tenant shall  provide  Landlord  with
written evidence that such insurance is in force.

       8.5  INSURANCE  POLICIES.   Insurance  required  hereunder  shall  be  in
companies duly licensed to transact business in the state where the Premises are
located, and maintaining during the policy term a "GENERAL POLICYHOLDERS RATING"
of at least B+ or such other rating as may be required by a Lender, as set forth
in the most current issue of "Best's  Insurance  Guide."  Tenant shall not do or
permit  to be done  anything  which  shall  invalidate  the  insurance  policies
referred to in this Paragraph 8. Tenant shall cause to be delivered to Landlord,
within  seven (7) days  after the  earlier of the Early  Possession  Date or the
Commencement Date, certified copies of, or certificates evidencing the existence
and amounts of the insurance  required under  Paragraph  8.2(a) and 8.4. No such
policy shall be cancelable or subject to  modification  except after thirty (30)
days' prior written  notice to Landlord.  Tenant shall at least thirty (30) days
prior to the  expiration  of such  policies (or as soon as possible  before said
expiration  date),  furnish  Landlord  with  evidence of renewals or  "insurance
binders"  evidencing  renewal thereof,  or Landlord may order such insurance and
charge the reasonable  cost thereof to Tenant,  which amount shall be payable by
Tenant to Landlord upon demand.

       8.6  WAIVER OF  SUBROGATION.  Notwithstanding  anything  to the  contrary
contained  herein,  Landlord and Tenant (for themselves and for their respective
insurers and any other person claiming  through or under them, by subrogation or
otherwise)  each hereby  release and relieve the other,  and waive their  entire
right to recover damages (whether in contract or in tort) against the other, for
loss or  damage to their  property  arising  out of or  incident  to the  perils
required to be insured against under Paragraph 8 or which is otherwise  insured,
regardless of cause or origin,  including the negligence of the other party, its
agents, employees,  shareholders,  officers and contractors.  The effect of such
releases and waivers of the right to recover damages shall not be limited by the
amount of  insurance  carried  or  required,  or by any  deductibles  applicable
thereto.  Landlord and Tenant agree to have their respective insurance companies
issuing  property  damage  insurance  waive any right to  subrogation  that such
companies  may have against  Landlord or Tenant,  as the case may be, so long as
the insurance is not invalidated thereby.

       8.7 INDEMNITY.  Except for Landlord's negligence and/or breach of express
warranties,  Tenant  shall  indemnify,  protect,  defend and hold  harmless  the
Premises,   Landlord  and  its  agents,  Landlord's  master  or  ground  lessor,
shareholders,  officers,  directors  and  Lenders  from and  against any and all
claims, loss of rents and/or damages, costs, liens, judgments,  penalties,  loss
of permits,  attorneys'  and  consultants'  fees,  expenses  and/or  liabilities
arising out of, involving, or in


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connection  with,  the  occupancy  of the  Premises  by Tenant,  the  conduct of
Tenant's  business,  any  act,  omission  or  neglect  of  Tenant,  its  agents,
contractors,  employees or invitees,  and out of any Default or Breach by Tenant
in the  performance  in a timely manner of any obligation on Tenant's part to be
performed under this Lease. The foregoing shall include,  but not be limited to,
the  defense  or  pursuit  of any  claim  or any act on or  proceeding  involved
therein,  and  whether  or not (in the case of  claims  made  against  Landlord)
litigated  and/or  reduced  to  judgment.  In case any action or  proceeding  is
brought against Landlord by reason of any of the foregoing matters, Tenant, upon
notice  from  Landlord,  shall  defend the same at  Tenant's  expense by counsel
reasonably  satisfactory to Landlord and Landlord shall cooperate with Tenant in
such defense. Landlord need not have first paid any such claim in order to be so
indemnified.

       8.8  EXEMPTION OF LANDLORD  FROM  LIABILITY.  Unless caused by Landlord's
active negligence or willful misconduct, Landlord shall not be liable for injury
or  damage to the  person or goods,  wares,  merchandise  or other  property  of
Tenant,  Tenant's  employees,  contractors,  invitees,  customers,  or any other
person in or about the  Premises,  whether such damage or injury is caused by or
results from fire, steam, electricity, gas, water or rain, or from the breakage,
leakage,  obstruction  or  other  defects  of  pipes,  fire  sprinklers,  wires,
appliances,  plumbing,  air conditioning or lighting fixtures, or from any other
cause,  whether said injury or damage results from  conditions  arising upon the
Premises or upon other  portions of the  Building  of which the  Premises  are a
part, from other sources or places,  and regardless of whether the cause of such
damage  or  injury  or the means of  repairing  the same is  accessible  or not.
Landlord shall not be liable for any damages  arising from any act or neglect of
any other  tenant of  Landlord  nor from the  failure by Landlord to enforce the
provisions  of  any  other  lease  in  the  Industrial  Center.  Notwithstanding
Landlord's  negligence  or  breach  of  this  Lease,  Landlord  shall  under  no
circumstances  be liable  for  injury to  Tenant's  business  or for any loss of
income or profit therefrom.

9.     DAMAGE OR DESTRUCTION.

       9.1      DEFINITIONS.

                (a) "PREMISES  PARTIAL  DAMAGE" shall mean damage or destruction
to the Premises,  other than Tenant-Owned Alterations and Utility Installations,
the repair cost of which damage or  destruction is less than fifty percent (50%)
of the then  Replacement  Cost (as defined in Paragraph 9.1 (d)) of the Premises
(excluding   Tenant-Owned   Alterations  and  Utility  Installations  and  Trade
Fixtures) immediately prior to such damage or destruction.

                (b)   "PREMISES   TOTAL   DESTRUCTION"   shall  mean  damage  or
destruction to the Premises,  other than  Tenant-Owned  Alterations  and Utility
Installations,  the repair cost of which damage or  destruction is fifty percent
(50%) or more of the then  Replacement  Cost of the Premises  (excluding  Tenant
Owned  Alterations and Utility  Installations  and Trade  Fixtures)  immediately
prior to such damage or destruction.  In addition,  damage or destruction to the
Building,  other than  Tenant-Owned  Alterations and Utility  Installations  and
Trade  Fixtures  of any  tenants of the  Building,  the cost of which  damage or
destruction  is  fifty  percent  (50%)  or more  of the  then  Replacement  Cost
(excluding Tenant-Owned Alterations and Utility Installations and Trade Fixtures
of any tenants of the Building) of the Building shall at the option of Landlord,
be deemed to be Premises Total Destruction.

                (c)  "INSURED  LOSS"  shall mean  damage or  destruction  to the
Premises,  other than Landlord Owned  Alterations and Utility  Installations and
Trade Fixtures, which was caused by an event required to be covered by insurance
described in Paragraph 8.3(a) irrespective of any deductible amounts or coverage
limits involved.

                (d) "REPLACEMENT  COST" shall mean the cost to repair or rebuild
the  improvements  owned  by  Landlord  at the time of the  occurrence  to their
condition  existing  immediately  prior thereto,  including  demolition,  debris
removal and upgrading  required by the operation of applicable  building  codes,
ordinances or laws, and without deduction for depreciation.

                (e) "HAZARDOUS SUBSTANCE CONDITION" shall mean the occurrence or
discovery of a condition  involving  the presence of, or a  contamination  by, a
Hazardous  Substance  as  defined  in  Paragraph  6.2(a),  in,  on, or under the
Premises.

       9.2 PREMISES  PARTIAL  DAMAGE - INSURED LOSS. If Premises  Partial Damage
that is an Insured Loss occurs,  then Landlord  shall,  at  Landlord's  expense,
repair such damage (but not Tenant's Trade Fixtures or Tenant-Owned  Alterations
and Utility Installations) as soon as reasonably possible and this Lease
shall continue in full force and effect.

                (a) In the event however,  that there is a shortage of insurance
proceeds  and such  shortage  is due to the fact  that,  by reason of the unique
nature of the  improvements  in the Premises  full  replacement  cost  insurance
coverage was not commercially  reasonable and available,  Landlord shall have no
obligation to pay for the shortage in insurance proceeds or to fully restore the
unique aspects of the Premises unless Tenant provides Landlord with the funds to
cover same, or adequate assurance thereof within ten (10) days following receipt
of written notice of such shortage and request  therefor.  If Landlord  receives
said  funds or  adequate  assurance  thereof  within  said ten (10) day  period,
Landlord shall complete them as soon as reasonably possible and this Lease shall
remain in full force and  effect.  If Landlord  does not  receive  such funds or
assurance within said period,  Landlord may nevertheless elect by written notice
to Tenant within ten (10) days thereafter to make such restoration and repair as
is commercially  reasonable  with Landlord  paying any shortage in proceeds,  in
which case this Lease shall  remain in full force and effect.  If Landlord  does
not receive  such funds or  assurance  within  such ten (10) day period,  and if
Landlord  does not so  elect to  restore  and  repair,  then  this  Lease  shall
terminate  effective  as of thirty (30) days  following  the  occurrence  of the
damage or destruction.

                (b) In the event that such damage, in the reasonable estimate of
Landlord's  contractor for such repairs,  cannot be repaired  within one hundred
eighty (180) days from the date of the Premises  Partial  Damage (under a normal
construction  schedule not  requiring  payment of overtime or  premium),  either
Landlord or Tenant may terminate this Lease by delivery of written notice to the
other party within thirty (30) days after the date that the contractor's opinion
is delivered to Tenant.  Upon  termination in accordance with this  Subparagraph
9.2(b),  Base Rent and any  additional  charges under this Lease and any related
agreement shall be apportioned as of the date of the Premises Partial Damage.

                (c) Unless otherwise  agreed,  Tenant shall in no event have any
right to  reimbursement  from  Landlord for any funds  contributed  by Tenant to
repair any such damage or destruction.  Premises  Partial Damage due to flood or
earthquake  shall be  subject  to  Paragraph  9.3  rather  than  Paragraph  9.2,
notwithstanding that there may be some insurance coverage,  but the net proceeds
of any such insurance  shall be made available for the repairs if made by either
Party.



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       9.3 PARTIAL DAMAGE - UNINSURED  LOSS. If Premises  Partial Damage that is
not an Insured Loss occurs unless caused by a negligent or willful act of Tenant
(in which event Tenant shall make the repairs at Tenant's expense and this Lease
shall  continue in full force and effect),  Landlord may at  Landlord's  option,
either (i) repair  such  damage as soon as  reasonably  possible  at  Landlord's
expense in which  event this Lease shall  continue in full force and effect,  or
(ii) give  written  notice to Tenant  within  thirty (30) days after  receipt by
Landlord of knowledge of the  occurrence of such damage of Landlord's  desire to
terminate  this Lease as of the date sixty (60) days  following the date of such
notice;  provided,  however,  if,  in  the  reasonable  estimate  of  Landlord's
contractor,  repairs of such damage cannot be repaired within one hundred eighty
(180) days from the date of Premises Partial Damage (under a normal construction
schedule not  requiring  payment of overtime or premium),  then  notwithstanding
Landlord's  decision to repair such damage,  Tenant may terminate  this Lease by
delivery of written  notice to Landlord  within  thirty (30) days after the date
said contractor's estimate is delivered to Tenant. In the event Landlord acts to
give such notice of Landlord's  intention to terminate this Lease,  Tenant shall
have the right  within  ten (10) days after the  receipt of such  notice to give
written notice to Landlord of Tenant's  commitment to pay for the repair of such
damage  totally at Tenant's  expense and without  reimbursement  from  Landlord.
Tenant shall provide Landlord with the required funds or satisfactory  assurance
thereof within thirty (30) days following such commitment  from Tenant.  In such
event this Lease shall  continue in full force and effect,  and  Landlord  shall
proceed to make such repairs as soon as reasonably  possible  after the required
funds are  available.  If Tenant does not give such notice and provide the funds
or  assurance  thereof  within  the times  specified  above,  this  Lease  shall
terminate as of the date specified in Landlord's notice of termination.

       9.4 TOTAL  DESTRUCTION.  Notwithstanding  any other  provision  hereof if
Premises Total  Destruction  occurs  (including any destruction  required by any
authorized  public  authority)  this  Lease  shall  terminate  thirty  (30) days
following the date of such Premises Total Destruction, whether or not the damage
or destruction is an insured Loss or was caused by a negligent or willful act of
Tenant.  In the event,  however,  that the damage or  destruction  was caused by
Tenant,  Landlord shall have the right to recover Landlord's damages from Tenant
except as released and waived in Paragraph 9.7.

        9.5 DAMAGE  NEAR END OF TERM.  If at any time  during the last eight (8)
months of the term of this  Lease  there is damage  for which the cost to repair
exceeds  $200,000,  whether or not an Insured Loss,  Landlord may, at Landlord's
option, terminate this Lease effective on a date to be determined by Tenant, not
less than  thirty  (30) or more than  ninety  (90)  days  following  the date of
occurrence  of such damage,  by giving  written  notice to Tenant of  Landlord's
election to do so within  fifteen (15) days after the date of occurrence of such
damage.  Provided,  however, if Tenant at that time has an exercisable option to
extend this Lease or to purchase the  Premises,  then Tenant may  preserve  this
Lease  by (a)  exercising  such  option,  and (b)  providing  Landlord  with any
shortage in insurance  proceeds (or adequate  assurance  thereof) needed to make
the  repairs  on or before  the  earlier  of (i) the date which is ten (10) days
after Tenant's receipt of Landlord's written notice purporting to terminate this
Lease,  or (ii) the day prior to the date upon which  such  option  expires.  If
Tenant duly exercises such option during such period and provides  Landlord with
funds (or adequate assurance thereof) to cover an shortage in insurance proceeds
Landlord  shall at Landlord's  expense  repair such damage as soon as reasonably
possible and this Lease shall continue in full force and effect. If Tenant fails
to exercise such option and provide such funds or assurance  during such period,
then this Lease shall  terminate as of the date set forth in the first  sentence
of this Paragraph 9.5.

       9.6      ABATEMENT OF RENT; TENANT'S REMEDIES.

                (a)  In the  event  of  (i)  Premises  Partial  Damage  or  (ii)
Hazardous Substance Condition for which Tenant is not legally  responsible,  the
Base Rent and other charges,  if any, payable by Tenant hereunder for the period
during which such damage or condition,  its repair,  remediation  or restoration
continues,  shall be abated in proportion to the degree to which Tenant's use of
the Premises is impaired.  Except for abatement of Base Rent and other  charges,
if any,  as  aforesaid,  all  other  obligations  of Tenant  hereunder  shall be
performed  by Tenant,  and Tenant shall have no claim  against  Landlord for any
damage suffered by reason of any such damage,  destruction,  repair, remediation
or  restoration,  except  to the  extent of  Landlord's  negligence  or  willful
misconduct  (and then only to the extent that Tenant has not waived its right to
recover such damages pursuant to Paragraph 8.6 of this Lease).

                (b) If  Landlord  shall be  obligated  to repair or restore  the
Premises under the  provisions of this Paragraph 9 and shall not commence,  in a
substantial and meaningful way, the repair or restoration of the Premises within
thirty (30) days after such  obligation  shall  accrue,  Tenant may, at any time
prior to the commencement of such repair or restoration,  give written notice to
Landlord  and to any  Lenders  of which  Tenant has  actual  notice of  Tenant's
election  to  terminate  this  Lease on a date not less  than  thirty  (30) days
following  the giving of such notice if Tenant gives such notice to Landlord and
such Lenders and such repair or restoration is not commenced within fifteen (15)
days after  receipt of such  notice this Lease  shall  terminate  as of the date
specified  in said  notice.  If  Landlord  or a Lender  commences  the repair or
restoration  of the Premises  within  thirty (30) days after the receipt of such
notice,  this Lease shall continue in full force and effect.  "COMMENCE" as used
in this Paragraph 9.6 shall mean either the  authorization of the preparation of
the  required  plans,  or the  beginning  of the  actual  work on the  Premises,
whichever occurs first.

       9.7 HAZARDOUS  SUBSTANCE  CONDITIONS.  If a Hazardous Substance Condition
(as defined in Paragraph  9.1(e)) occurs,  unless Tenant is legally  responsible
therefor  (in which case Tenant  shall make the  investigation  and  remediation
thereof  required by Applicable  Requirements  and this Lease shall  continue in
full force and effect,  but subject to Landlord's  rights under Paragraph 6.2(c)
and Paragraph 13), Landlord may, at Landlord's  option,  either: (i) investigate
and  remediate  such  Hazardous  Substance  Condition,  if required,  as soon as
reasonably  possible  at  Landlord's  expense,  in which  event this Lease shall
continue in full force and effect;  or (ii) if the estimated cost to investigate
and remediate  such  condition  exceeds  twelve (12) times the then monthly Base
Rent or $100,000 whichever is greater,  and such Hazardous  Substance  Condition
was not caused by Landlord or its agents, employees, contractors or invitees and
such Hazardous  Substance Condition  materially  interferes with Tenant's or any
other  Building  occupant's  business in the  Building,  give written  notice to
Tenant  within  thirty (30) days after  receipt by Landlord of  knowledge of the
occurrence  of such  Hazardous  Substance  Condition  of  Landlord's  desire  to
terminate  this Lease as to the date sixty (60) days  following the date of such
notice. In the event Landlord elects to give such notice of Landlord's intention
to terminate this Lease,  Tenant shall have the right within ten (10) days after
the  receipt of such  notice to give  written  notice to  Landlord  of  Tenant's
commitment to pay for the excess costs of a  investigation  and  remediation  of
such  Hazardous  Substance  Condition  to  the  extent  required  by  Applicable
Requirements,  over (b) an amount  equal to twelve  (12) times the then  monthly
Base Rent or $100,000,  whichever is greater. Tenant shall provide Landlord with
the funds required of Tenant or  satisfactory  assurance)  thereof within thirty
(30) days  following said  commitment by Tenant.  In such event this Lease shall
continue in full force and effect, and Landlord shall proceed to make

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such  investigation  and  remediation  as soon as reasonably  possible after the
required  funds are  available.  If Tenant does not give such notice and provide
the required funds or assurance  thereof within the time period specified above,
this Lease shall  terminate  as of the date  specified in  Landlord's  notice of
termination.

       9.8  TERMINATION  - ADVANCE  PAYMENTS.  Upon  termination  of this  Lease
pursuant  to this  Paragraph  9,  Landlord  shall  return to Tenant any  advance
payment made by Tenant to Landlord and so much of Tenant's  Security  Deposit as
has not been, or is not then required to be, used by Landlord under the terms of
this Lease.

       9.9 WAIVER OF STATUTES.  Landlord and Tenant agree that the terms of this
Lease shall  govern the effect of any damage to or  destruction  of the Premises
and the Building with respect to the  termination of this Lease and hereby waive
the provisions of any present or future statute to the extent it is inconsistent
herewith.

10.    REAL PROPERTY TAXES.

       10.1 PAYMENT OF TAXES. Landlord shall timely pay the Real Property Taxes,
as defined in Paragraph 10.2, applicable to the Industrial Center, and except as
otherwise  provided in Paragraph 10.3, any such amounts shall be included in the
cost of Building  Services in accordance  with the  provisions of Paragraph 4.2;
provided,  however, that following Landlord's receipt of the reassessment of the
Industrial  Center by the  County of San Diego  Tax  Assessor,  pursuant  to the
change in  ownership  of the  Building  in  December  1995,  Base Rent  shall be
adjusted upward or downward to reflect any upward or downward  assessment of the
value of the  Industrial  Center,  and  Landlord  and Tenant agree to amend this
Lease to reflect the revised Base Rent.

        10.2 REAL  PROPERTY  TAX  DEFINITION.  As used  herein,  the term  "REAL
PROPERTY  TAXES"  shall  include  any  form of real  estate  tax or  assessment,
general,  special  ordinary or  extraordinary,  and any license fee,  commercial
rental tax,  improvement bond or bonds,  levy or tax imposed upon the Industrial
Center by any authority  having the direct or indirect  power to tax,  including
any city, state or federal government,  or any school,  agricultural,  sanitary,
fire, street,  drainage,  or other improvement district thereof,  levied against
any legal or  equitable  interest of Landlord  in the  Industrial  Center or any
portion  thereof,  Landlord's  right to rent or other income  therefrom,  and/or
Landlord's  business of leasing the  Premises.  The term "REAL  PROPERTY  TAXES"
shall also include any tax, fee,  levy,  assessment  or charge,  or any increase
therein  imposed by reason of events  occurring,  or changes in  Applicable  Law
taking  effect,  during the term of this Lease,  including  but not limited to a
change in the ownership of the Industrial Center or in the improvements thereon,
the execution of this Lease or any  modification,  amendment or transfer thereof
and whether or not contemplated by the Parties.  Nothing contained in this Lease
shall  require  Tenant to pay  either  directly  or by way of  reimbursement  to
Landlord,  any  franchise,  estate,  inheritance  or succession  transfer tax of
Landlord,  or any income,  profits or revenue tax or charge, upon the net income
of Landlord from all sources; provided,  however, that if at any time during the
term of this Lease under the laws of the United  States  Government or the State
of California, or any political subdivision thereof, a tax or excise on rent, or
any other tax however described  (excluding any tax measured by net income),  is
levied or assessed by any such  political  body  against  Landlord on account of
Rent,  or a portion  thereof,  Real  Property  Taxes  shall  include one hundred
percent (100%) of any said tax or excise. In calculating Real Property Taxes for
any calendar year, the Real Property Taxes for any real estate tax year shall be
included in the  calculation of Real Property Taxes for such calendar year based
upon the number of days which such calendar year and tax year have in common.

       10.3 ADDITIONAL  IMPROVEMENTS.  The costs payable by Landlord as Building
Services shall not include the costs of Real Property Taxes specified in the tax
assessor's  records and work sheets as being caused by  additional  improvements
placed upon the  Industrial  Center by Tenant or by Landlord  for the  exclusive
enjoyment of Tenant.  Notwithstanding Paragraph 10.1 hereof, Tenant shall pay to
Landlord,  in accordance with Paragraph 4.2(c),  the entirety of any increase in
Real Property Taxes if assessed solely by reason of Alterations,  Trade Fixtures
or Utility  Installations  placed  upon the  Premises  by Tenant or at  Tenant's
request.

11. UTILITIES AND SERVICES. All utilities and services supplied to the Premises,
including but not limited to water (including RODI water),  sewer,  electricity,
heating,  ventilating and air-conditioning,  security, gas and trash removal for
and normal cleaning of the Premises,  together with any taxes thereon,  shall be
paid for by tenant  through  inclusion in Base Rent.  Tenant's use of electrical
service in the Premises shall not exceed, either in voltage, rated capacity, use
or overall load,  that which Landlord  reasonably  determines to be standard for
Tenant's  Permitted Use of the  Premises.  In the event Tenant shall consume (or
request  that it be allowed to  consume)  water,  gas or  electrical  service in
excess of that  deemed by  Landlord  to be  standard  (and upon  which Base Rent
payable by Tenant  under  this  Lease is  calculated),  Landlord  may  condition
Tenant's  excess usage upon such  conditions  as Landlord may  reasonably  elect
(including the installation of utility service upgrades,  submeters,  additional
air  handlers  or  cooling  units),  and all  such  usage  (to the  extent  such
additional usage is feasible and permitted by law), installation and maintenance
thereof shall be paid for by Tenant as an additional  charge;  provided that the
cost of such  excess  usage  shall not  exceed the rate that would be charged to
Tenant if billed directly by the local utility for the same services.

       11.1  HEATING,  VENTILATING  AND  AIR-CONDITIONING.   The  furnishing  of
heating,  ventilation  and air  conditioning  ("HVAC") for the Premises shall be
without  representation  or warranty  from  Landlord as to whether  HVAC for the
Premises complies with Tenant's exact performance  specifications  thereof or as
to the adequacy of the HVAC for meeting Tenant's particular  requirements in its
use of the  Premises,  but shall be  operated  in a manner  consistent  with the
design  specifications  and capacities of such equipment and systems as the same
may exist as of the date of this  Lease.  The cost of  maintenance  and  service
calls to adjust and regulate  the HVAC system for the Premises  shall be charged
to Tenant if the need for maintenance  work results from Tenant's  adjustment of
room  thermostats in deviation  from  Landlord's  thermostat  settings as set by
Landlord in its reasonable  judgment for the comfortable and normal occupancy of
the Premises.

       11.2  TELEPHONE.  The  costs  and  expenses  of any  and  all  local  and
long-distance  telephone  services,  associated hook-up and maintenance fees and
any other  telephone  charges,  and the cost of any  additional  or  replacement
equipment or cabling to the Premises shall be at Tenant's sole cost and expense.

       11.3  SECURITY  AND  JANITORIAL   SERVICES.   Building  security  systems
consistent  with those  currently in place,  securing  access to the Building by
card key access to the Building lobby shall be provided by Landlord and paid for
by Tenant

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through  inclusion in the Base Rent,  except that Tenant shall be liable for the
cost of replacing  any lost or stolen card keys  provided to Tenant by Landlord.
Landlord shall provide  vacuuming and general cleaning  services to the Premises
at least  five (5) days per week,  Monday  through  Friday  (excluding  Building
holidays,  as set forth in the Building Rules and Regulations) at such times and
under such general terms as Landlord may establish in its reasonable  discretion
from time to time. The cost of Building- standard  janitorial  services provided
to the  Premises  shall be paid for by Tenant  through  inclusion  in Base Rent.
Tenant shall pay the  additional  cost  reasonably  attributable  to any special
janitorial  services provided to the Premises as a result of Tenant's particular
requirements,   Trade  Fixtures  or  Tenant-Owned   Alterations  and/or  Utility
Installations,  which  shall  be  billed  separately  by  Landlord  based on the
janitorial service provider's invoices.

       11.4 RECEPTIONIST SERVICES. Landlord shall provide a receptionist for the
Building  ("BUILDING  RECEPTIONIST"),  located in the main entrance lobby of the
Building,  Monday through Friday (excluding  Building holidays,  as set forth in
the Building Rules and Regulations),  during the hours set forth in the Building
Rules and Regulations and, subject to Tenant's  reasonable  review and approval,
under such general terms as Landlord may establish in its reasonable  discretion
from  time to time.  The  cost of such  receptionist  services  shall be paid by
Tenant as an inclusion in Base Rent. Provided that Tenant gives Landlord written
notice  of any such  special  services  or  overtime  provided  by the  Building
Receptionist on a monthly basis,  Tenant may separately arrange for the Building
Receptionist to provide  special or overtime  services not covered by Landlord's
contract.  Tenant shall pay the additional  cost for such services and overtime,
which shall be billed separately by Landlord.

12.    ASSIGNMENT AND SUBLETTING.

       12.1     LANDLORD'S CONSENT REQUIRED.

                (a) Tenant shall not  voluntarily or by operation of law assign,
transfer, mortgage or otherwise transfer or encumber (collectively, "assign") or
sublet all or any part of  Tenant's  interest  in this Lease or in the  Premises
without Landlord's prior written consent given under and subject to the terms of
Paragraph 36.

                (b) A change  in the  control  of  Tenant  shall  constitute  an
assignment requiring Landlord's consent. The transfer, on a cumulative basis, of
fifty percent (50%) or more of the voting  control of Tenant  (provided that the
foregoing shall not apply so long as Tenant remains a publicly-traded company on
a national  securities  exchange),  or the transfer,  on a cumulative  basis, of
twenty-five  percent  (25%) or more of the voting  control of Tenant to a single
person or entity or commonly-controlled  entities,  shall constitute a change in
control for this purpose.

                (c) An assignment  or  subletting  of Tenant's  interest in this
Lease without  Landlord's  specific prior written  consent shall,  at Landlord's
option,  be a Breach of this Lease. If Landlord elects to treat such unconsented
to  assignment  or  subletting  as a Breach,  Landlord  shall  have the right to
either:  (i) exercise any of Landlord's  remedies under Section 13.2 (subject to
Tenant's  cure rights under Section 13.1) or (ii) upon thirty (30) days' written
notice ("LANDLORD'S NOTICE"), increase the monthly Base Rent for the Premises to
the greater of the then fair market rental value of the Premises,  as reasonably
determined  by Landlord or one hundred ten percent  (110%) of the Base Rent then
in  effect.  Pending  determination  of the new fair  market  rental  value,  if
disputed by Tenant,  Tenant shall pay the amount set forth in Landlord's Notice,
with any  overpayment  credited  against  the next  installment(s)  of Base Rent
coming due, and any underpayment  for the period  retroactively to the effective
date of the adjustment being due and payable  immediately upon the determination
thereof.  Further,  in the event of such Breach and rental  adjustment,  (i) the
purchase  price of any option to purchase the  Premises  held by Tenant shall be
subject  to  similar  adjustment  to the then  far  market  value as  reasonably
determined by Landlord (without the Lease being considered an encumbrance or any
deduction for  depreciation or obsolescence  and considering the Premises at its
highest and best use and in good condition) or one hundred ten percent (110%) of
the  price  previously  in  effect,  (ii)  any  index-oriented  rental  or price
adjustment  formula as contained in this Lease shall be adjusted to require that
the base index be determined with reference to the index  applicable to the time
of such adjustment,  and (iii) any fixed rental adjustments scheduled during the
remainder  of the Lease  term  shall be  increased  in the same ratio as the new
rental  bears to the Base Rent in  effect  immediately  prior to the  adjustment
specified in Landlord's Notice.

       12.2     TERMS AND CONDITIONS APPLICABLE TO ASSIGNMENT AND
SUBLETTING.

                (a) Regardless of Landlord's consent or a Permitted Transfer not
requiring  Landlord's consent (as provided in Subparagraph 12.4), any assignment
or subletting shall not (i) be effective without the express written  assumption
by such  assignee or  sublessee of the  obligations  of Tenant under this Lease,
(ii) release Tenant of any  obligations  hereunder,  nor (iii) alter the primary
liability  of Tenant for the  payment  of Base Rent and other sums due  Landlord
hereunder or for the  performance  of any other  obligations  to be performed by
Tenant under this Lease.

                (b)  Landlord  may accept any rent or  performance  of  Tenant's
obligations from any person other than Tenant pending approval or disapproval of
an assignment. Neither a delay in the approval or disapproval of such assignment
nor the  acceptance  of any rent for  performance  shall  constitute a waiver or
estoppel of Landlord's  right to exercise its remedies for the Default or Breach
by Tenant of any of the terms, covenants or conditions of this Lease.

                (c) The  consent of  Landlord to any  assignment  or  subletting
shall not  constitute a consent to any  subsequent  assignment  or subletting by
Tenant or to any  subsequent  or  successive  assignment  or  subletting  by the
assignee or sublessee.  However,  Landlord may consent to subsequent sublettings
and  assignments  of the sublease or any  amendments  or  modifications  thereto
without  notifying Tenant or anyone else liable under this Lease or the sublease
and without  obtaining  their  consent,  and such action  shall not relieve such
persons from liability under this Lease or the sublease.

                (d) In the event of any Default or Breach of Tenant's obligation
under this Lease,  Landlord may proceed  directly  against Tenant or anyone else
responsible  for the performance of the Tenant's  obligations  under this Lease,
including any sublessee,  without first exhausting  Landlord's  remedies against
any other person or entity  responsible  therefor to  Landlord,  or any security
held by Landlord.

                (e) Each  request for  consent to an  assignment  or  subletting
shall  be  in  writing   accompanied  by  information   relevant  to  Landlord's
determination   as  to  the  financial  and   operational   responsibility   and
appropriateness of the proposed assignee or sublessee  including but not limited
to the  intended  use and/or  required  modification  of the  Premises,  if any,
together with a deposit of $1,000,  as reasonable  consideration  for Landlord's
considering  and processing the request for consent.  Tenant agrees to reimburse
Landlord for all of Landlord's expenses associated with Tenant's request for any
sublease  or  assignment,  including,  but not  limited  to,  Landlord's  actual
attorneys' fees and costs up to an

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amount of $1,000 per request for all such costs and expenses. Tenant also agrees
to  provide   Landlord  with  such  other  or  additional   information   and/or
documentation as may be reasonably requested by Landlord.

                (f) Any assignee of, or sublessee  under,  this Lease shall,  by
reason of accepting such  assignment or entering into such sublease,  be deemed,
for the benefit of  Landlord,  to have  assumed and agreed to conform and comply
with each and every term covenant condition and obligation herein to be observed
or performed by Tenant  during the term of said  assignment  or sublease,  other
than such  obligations as are contrary to or inconsistent  with provisions of an
assignment or sublease to which Landlord has specifically consented in writing.

                (g) If for any assignment or sublease,  Tenant  receives rent or
other  consideration,  either  initially or over the term of the  assignment  or
sublease,  in excess of the Base Rent  called for  hereunder,  or in case of the
sublease  of a portion  of the  Premises,  in  excess  of such Base Rent  fairly
allocable to such  portion,  after  appropriate  adjustments  to assure that all
other payments called for hereunder are appropriately taken into account, Tenant
shall pay to Landlord, as additional rent hereunder,  fifty percent (50%) of the
excess of each such  payment of rent or other  consideration  received by Tenant
over  Tenant's  customary  and  reasonable  costs and  expenses  of  making  the
assignment  or sublease  (which costs and expenses  shall be amortized  over the
term of the assignment or sublease), which shall be due and payable by Tenant to
Landlord promptly after its receipt by Tenant.

       12.3  ADDITIONAL  TERMS AND  CONDITIONS  APPLICABLE  TO  SUBLETTING.  The
following terms and conditions shall apply to any subletting by Tenant of all or
any part of the Premises  and shall be deemed  included in all  subleases  under
this Lease whether or not expressly incorporated therein:

                (a) Tenant  hereby  assigns and  transfers  to  Landlord  all of
Tenant's  interest in all rentals and income arising from any sublease of all or
any portion of the Premises heretofore or hereafter made by Tenant, and Landlord
may  collect  such rent and income and apply same  toward  Tenant's  obligations
under this Lease provided, however, that until a Breach (as defined in Paragraph
13.1) shall occur in the performance of Tenant's  obligations  under this Lease,
Tenant may,  except as otherwise  provided in this Lease,  receive,  collect and
enjoy the rents accruing  under such sublease.  Landlord shall not, by reason of
the  foregoing  provision or any other  assignment of such sublease to Landlord,
nor by reason of the collection of the rents from a sublessee,  be deemed liable
to the  sublessee  for any  failure of Tenant to perform  and comply with any of
Tenant's  obligations  to such  sublessee  under such  Sublease.  Tenant  hereby
irrevocably authorizes and directs any such sublessee, upon receipt of a written
notice from Landlord stating that a Breach exists in the performance of Tenant's
obligations under this Lease, to pay to Landlord the rents and other charges due
and to  become  due  under  the  sublease,  sublessee  shall  rely upon any such
statement  and request from  Landlord and shall pay such rents and other charges
to Landlord  without any  obligation to inquire as to whether such Breach exists
and notwithstanding any notice from or claim from Tenant to the contrary (unless
Tenant  provides such sublessee with  reasonable  evidence  refuting  Landlord's
written notice). Tenant shall have no right or claim against such sublessee, or,
until the Breach has been cured, against Landlord,  for any such rents and other
charges so paid by said sublessee to Landlord.

                (b) In the event of a Breach by Tenant in the performance of its
obligations under this Lease, Landlord, at its option and without any obligation
to do so, may  require  any  sublessee  to attorn to  Landlord,  in which  event
Landlord shall  undertake the  obligations of the sublessor  under such sublease
from the time of the exercise of said option to the expiration of such sublease;
provided,  however,  Landlord  shall  not be  liable  for any  prepaid  rents or
security deposit paid by such sublessee to such sublessor or for any other prior
defaults or breaches of such sublessor under such sublease.

                (c) No  sublessee  under a sublease  approved by Landlord  shall
further  assign or sublet  all or any part of the  Premises  without  Landlord's
prior written consent.

                (d)  Landlord  shall  deliver a copy of any notice of Default or
Breach by Tenant to the sublessee,  who shall have the right to cure the Default
of Tenant  within  the grace  period,  if any,  specified  in such  notice.  The
sublessee shall have a right of reimbursement and offset from and against Tenant
for any such Defaults cured by the sublessee.

       12.4  PERMITTED  TRANSFER.  Any  provision  in this Lease to the contrary
notwithstanding, and so long as Tenant otherwise complies with the provisions of
this  Paragraph  12,  Landlord's  consent  shall not be required  for any of the
following  transfers  (each of which shall be a  "PERMITTED  TRANSFER,"  and the
transferee of such Permitted  Transfer shall be a "PERMITTED  TRANSFEREE"),  and
Landlord  shall not be entitled  to receive  any part of the  subrent  resulting
therefrom  that would  otherwise be due under this  Paragraph 12;  provided that
before such assignment  shall be effective,  (a) Landlord shall be given written
notice  of such  Permitted  Transfer  and (b)  the  use of the  Premises  by the
Permitted  Transferee  shall be as set forth in Subparagraph  6.1. "NET WORTH OF
TENANT" for purposes of this Lease shall be the net worth of Tenant  established
under generally accepted accounting principles consistently applied.

                (a) Tenant may  sublease  all or part of the  Premises or assign
its interest in this Lease to any corporation  which controls,  is controlled by
or is under common control with the original Tenant to this Lease by means of an
ownership interest of more than 50%. For purposes of this Subparagraph  12.4(a),
the term "ownership interest" means possession,  directly or indirectly,  of the
power to direct or cause the direction of the  management,  affairs and policies
of anyone,  whether through the ownership of voting  securities,  by contract or
otherwise.

                (b) Tenant may assign its interest in the Lease to a corporation
which  results from a merger,  consolidation  or other  reorganization  in which
Tenant is not the surviving  corporation,  so long as the surviving  corporation
has a net  worth  at the  time of such  Permitted  Transfer  that is equal to or
greater than the lesser of (i) the Net Worth of Tenant immediately prior to such
Permitted Transfer or (ii) the Net Worth of Tenant on the Commencement Date.

                (c)  Tenant  may  assign  this  Lease  to  a  corporation  which
purchases  or  otherwise  acquires  all or  substantially  all of the  assets of
Tenant,  so long as such  acquiring  corporation  has a net worth at the time of
such  Permitted  Transfer that is equal to or greater than the lesser of (i) the
Net Worth of Tenant  immediately prior to such Permitted  Transfer,  or (ii) the
Net Worth of Tenant on the Commencement Date.

13.    DEFAULT; BREACH; REMEDIES.

       13.1  DEFAULT;  BREACH.  Landlord and Tenant agree that if an attorney is
consulted  by either party in  connection  with a default or breach by the other
party of the material terms,  covenants,  conditions or rules  applicable to the
other  party,  the  reasonable   out-of-pocket  costs  for  legal  services  and
out-of-pocket  costs in the preparation and service of a notice of Default shall
be reimbursed by the party receiving such notice as follows:  (i) in the case of
a Tenant  Default or Breach,  as  additional  rent due and  payable to cure said
default; or (ii) in the case of Landlord's breach pursuant to Paragraph 13.5,



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reimbursable  by Landlord in  accordance  with  Paragraph  13.5.  A "DEFAULT" by
Tenant is defined as a failure by Tenant to observe,  comply with or perform any
of the terms,  covenants,  conditions  or rules  applicable to Tenant under this
Lease.  A "BREACH" by Tenant is defined as the  occurrence of any one or more of
the  following  Defaults,  and,  where a grace  period for cure after  notice is
specified  herein,  the  failure  by Tenant to cure  such  Default  prior to the
expiration of the applicable grace period,  and shall entitle Landlord to pursue
the remedies set forth in Paragraph 13.2;

                (a) The  vacating  of the  Premises  without  the  intention  to
reoccupy same, or the abandonment of the Premises.

                (b) Except as expressly  otherwise  provided in this Lease,  the
failure by Tenant to make any payment of Base Rent or any other monetary payment
required to be made by Tenant  hereunder  as and when due, the failure by Tenant
to provide  Landlord  with  reasonable  evidence  of  insurance  or surety  bond
required  under this Lease,  or the failure of Tenant to fulfill any  obligation
under this Lease which  endangers  or  threatens  life or  property,  where such
failure  continues  for a period of five (5)  business  days  following  written
notice  thereof by or on behalf of Landlord to Tenant (or such shorter period of
time as Landlord  determines to be reasonable in the event of a proximate threat
to life or property).

                (c) Except as expressly  otherwise  provided in this Lease,  the
failure by Tenant to provide Landlord with reasonable  written evidence (in duly
executed  original  form  if  applicable)  of  (i)  compliance  with  Applicable
Requirements  per  Paragraph  6.2(d),  (ii) the  rescission  of an  unauthorized
assignment or subletting per Paragraph 12.1,  (iii) an Estoppel  Certificate per
Paragraph  16, (iv) the  subordination  or  non-subordination  of this Lease per
Paragraph 30, (v) the  execution of any document  requested  under  Paragraph 42
(easements),  or (vi) any other  documentation or information which Landlord may
reasonably  require  of Tenant  under the  terms of this  lease,  where any such
failure  continues for a period of ten (10) days following  written notice by or
on behalf of  Landlord to Tenant (or such  longer  period of time as  reasonably
required by Tenant to comply with or to provide  reasonable  written evidence of
compliance with the Applicable  Requirements,  if Tenant is reasonably unable to
comply with such ten-day period).

                (d) A Default by Tenant as to the terms,  covenants,  conditions
or provisions of this Lease,  or of the rules adopted under  Paragraph 40 hereof
that are to be observed,  complied with or performed by Tenant, other than those
described  in  Subparagraphs  13.1 (a),  (b) or (c),  above  where such  Default
continues for a period of thirty (30) days after written notice thereof by or on
behalf of Landlord to Tenant; provided,  however, that if the nature of Tenant's
Default is such that more than thirty (30) days are reasonably  required for its
cure,  then it shall not be  deemed  to be a Breach  of this  Lease by Tenant if
Tenant  commences  such cure within  said thirty (30) day period and  thereafter
diligently prosecutes such cure to completion.

                (e)  The  occurrence  of any of the  following  events:  (i) the
making by Tenant of any general  arrangements  or assignment  for the benefit of
creditors;  (ii) Tenant's becoming a "debtor" as defined in 11 U.S. Code Section
101 or any successor  statute thereto  (unless,  in the case of a petition filed
against  Tenant  the same is  dismissed  within  sixty  (60)  days);  (iii)  the
appointment of a trustee or receiver to take possession of substantially  all of
Tenant's  assets  located at the Premises or of Tenant's  interest in this Lease
where  possession is not restored to Tenant within thirty (30) days; or (iv) the
attachment, execution or other judicial seizure of substantially all of Tenant's
assets located at the Premises or of Tenant's  interest in this Lease where such
seizure is not discharged within thirty (30) days provided, however in the event
that any provision of this  Subparagraph  13.1(e) is contrary to any  applicable
law,  such  provision  shall be of no force or effect,  and shall not affect the
validity of the remaining provisions.

                (f) The discovery by Landlord  that any  financial  statement of
Tenant given to Landlord by Tenant was materially false.

       13.2  REMEDIES.  If  Tenant  fails to  perform  any  affirmative  duty or
obligation of Tenant under this Lease, within ten (10) days after written notice
to Tenant  (or in case of an  emergency  without  notice),  Landlord  may at its
option (but  without  obligation  to do so) perform such duty or  obligation  on
Tenant's  behalf,  including  but not  limited to the  obtaining  of  reasonably
required  bonds  insurance  policies,  or  governmental  licenses,   permits  or
approvals. The reasonable costs and expenses of any such performance by Landlord
shall be due and payable by Tenant to Landlord  upon  invoice  therefor.  If any
check given to Landlord by Tenant shall not be honored by the bank upon which it
is drawn,  Landlord, at its own option, may require a future payments to be made
under this Lease by Tenant to be made only by cashier's check. In the event of a
Breach of this Lease by Tenant (as defined in Paragraph  13.1),  with or without
further notice or demand,  and without limiting  Landlord in the exercise of any
right or remedy which Landlord may have by reason of such Breach, Landlord may:

                (a)  Terminate  Tenant's  right to possession of the Premises by
any lawful means,  in which case this Lease and the term hereof shall  terminate
and Tenant shall immediately  surrender  possession of the Premises to Landlord.
In such event Landlord  shall be entitled to recover from Tenant:  (i) the worth
at the time of the award of the unpaid 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 which would have been earned  after  termination  until the time of
award  exceeds the amount of such rental loss that the Tenant  proves could have
been reasonably  avoided;  (iii) the worth at the time of award of the amount by
which  the  unpaid  rent for the  balance  of the term  after  the time of award
exceeds  the  amount  of such  rental  loss  that  the  Tenant  proves  could be
reasonably  avoided;  and (iv) any other amount necessary to compensate Landlord
for all the detriment  proximately caused by the 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  Premises,   expenses  of  reletting,   including  necessary
renovation and alteration of the Premises,  reasonable attorneys' fees, and that
portion of any leasing commission paid by Landlord in connection with this Lease
applicable to the unexpired  term of this Lease.  The worth at the time of award
of the  amount  referred  to in  provision  (iii) of the  immediately  preceding
sentence  shall be computed by  discounting  such amount at the discount rate of
the Federal  Reserve Bank of San Francisco or the Federal  Reserve Bank District
in which the  Premises  are located at the time of award plus one percent  (1%).
Efforts by Landlord to mitigate  damages caused by Tenant's Default or Breach of
this  Lease  shall not waive  Landlord's  right to  recover  damages  under this
Paragraph 13.2. If termination of this Lease is obtained through the provisional
remedy of unlawful  detainer,  Landlord  shall have the right to recover in such
proceeding the unpaid rent and damages as are recoverable  therein,  or Landlord
may reserve the right to recover all or any part thereof in a separate  suit for
such  rent  and/or  damages.  If  a  notice  and  grace  period  required  under
Subparagraph  13.1(b), (c) or (d) was not previously given, a notice to pay rent
or quit,  or to  perform or quit as the case may be,  given to Tenant  under any
statute  authorizing  the forfeiture of leases for unlawful  detainer shall also
constitute  the  applicable  notice for  calculating  grace periods  required by
Subparagraph 13.1(b),(c) or (d). In such case, the applicable grace period under
the unlawful  detainer statue shall run  concurrently  with the applicable grace
period under this Lease after the one such statutory notice,  and the failure of
Tenant to cure the


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Default  within the greater of the two (2) such grace periods  shall  constitute
both an unlawful  detainer and a Breach of this Lease entitling  Landlord to the
remedies provided for in this Lease and/or by said statute.

                (b) Continue the Lease and Tenant's  right to possession  (under
California Civil Code Section 1951.4 or any superseding  statute) after Tenant's
Breach and recover the rent as it becomes due,  provided Tenant has the right to
sublet or assign,  subject only to reasonable  limitations.  Landlord and Tenant
agree  that the  limitations  on  assignment  and  subletting  in this Lease are
reasonable Acts of maintenance or  preservation,  efforts to relet the Premises,
or the  appointment of a receiver to protect the Landlord's  interest under this
Lease, shall not constitute a termination of the Tenant's right to possession.

                (c)  Pursue  any other  remedy  now or  hereafter  available  to
Landlord under the laws or judicial  decisions of the state wherein the Premises
are located.

                (d) The  expiration  or  termination  of this  Lease  and/or the
termination  of  Tenant's  right to  possession  shall not  relieve  Tenant from
liability under any indemnity  provisions of this Lease as to matters  occurring
or accruing  during the term hereof or by reason of  Tenant's  occupancy  of the
Premises.

       13.3     INTENTIONALLY DELETED.

       13.4 LATE CHARGES. Tenant hereby acknowledges that late payment by Tenant
to Landlord of rent and other sums due  hereunder  will cause  Landlord to incur
costs  not  contemplated  by this  Lease,  the  exact  amount  of which  will be
extremely  difficult to ascertain.  Such costs include,  but are not limited to,
processing  and accounting  charges,  and late charges which may be imposed upon
Landlord by the terms of any ground  lease,  mortgage or deed of trust  covering
the  Premises.  Accordingly,  if any  installment  of rent or other sum due from
Tenant shall not be received by Landlord or Landlord's  designee within ten (10)
days after such amount shall be due, then, without any requirement for notice to
Tenant. Tenant shall pay to Landlord a late charge equal to five percent (5%) of
such overdue amount;  provided,  however,  that, no more than twice per calendar
year, Tenant shall not incur the obligation to pay the foregoing charge for late
payment until five (5) days after  Tenant's  receipt of written notice that such
amounts have not been  received by Landlord  when due. The parties  hereby agree
that such late charge  represents  a fair and  reasonable  estimate of the costs
Landlord will incur by reason of late payment by Tenant. Acceptance of such late
charge by Landlord shall in no event  constitute a waiver of Tenant's Default or
Breach with respect to such overdue amount, nor prevent Landlord from exercising
any of the other rights and remedies granted hereunder. In the event that a late
charge is payable hereunder, whether or not collected, for three (3) consecutive
installments  of Base  Rent,  then  notwithstanding  Paragraph  4.1 or any other
provision of this Lease to the contrary,  Base Rent shall, at Landlord's option,
become due and payable quarterly in advance.

       13.5 BREACH BY LANDLORD.  Landlord  shall not be deemed in breach of this
Lease unless  Landlord  fails within a reasonable  time to perform an obligation
required to be  performed by Landlord.  For purposes of this  Paragraph  13.5, a
reasonable time shall in no event be less than thirty (30) days after receipt by
Landlord,  and by any Lender(s) whose name and address shall have been furnished
to Tenant in writing for such purpose, of written notice specifying wherein such
obligation  of Landlord has not been  performed;  provided,  however that if the
nature of  Landlord's  obligation  is such that more than thirty (30) days after
such notice are reasonably required for its performance, then Landlord shall not
be in breach of this Lease if performance  is commenced  within such thirty (30)
day period after  delivery of Tenant's  written  notification  and is thereafter
diligently pursued to completion.  If Landlord (a) does not commence performance
within  such thirty (30) day period,  or (b) fails to  diligently  commence  and
pursue such performance to completion, and the effect of such failure associated
with  such  non-performance  materially  interferes  with  Tenant's  Use  of the
Premises,  Tenant may perform Landlord's  obligation,  at Landlord's expense (if
the  cost of such  performance  obligations  are  included  in Base  Rent),  and
Landlord shall reimburse Tenant within thirty (30) days of Tenant's  delivery to
Landlord of written proof that such performance  costs have been paid by Tenant.
If Landlord  fails to reimburse  Tenant  within such 30-day  period,  Tenant may
deduct the cost of such repairs from future payments becoming due and payable to
Landlord.

14.  CONDEMNATION.  If the  Premises or any portion  thereof are taken under the
power of eminent  domain or sold under the threat of the  exercise of said power
(all of which are herein called  "condemnation"),  this Lease shall terminate as
to the part so taken as of the date  the  condemning  authority  takes  title or
possession,  whichever first occurs. If more than ten percent (10%) of the floor
area of the Premises,  or more than twenty-five  percent (25%) of the portion of
the Common  Areas  designated  for  Tenant's  parking is taken by  condemnation,
Tenant may at Tenant's  option,  to be exercised in writing within ten (10) days
after  Landlord shall have given Tenant written notice of such taking (or in the
absence of such  notice,  within ten (10) days  after the  condemning  authority
shall have taken possession)  terminate this Lease as of the date the condemning
authority takes such possession. Failure by Tenant to deliver such notice within
such 10-day period shall be deemed  Tenant's  decision to continue the Lease. If
Tenant does not terminate  this Lease in  accordance  with the  foregoing,  this
Lease shall  remain in full force and effect as to the  portion of the  Premises
remaining  except that the Base Rent shall be reduced in the same  proportion as
the rentable  floor area of the Premises taken bears to the total rentable floor
area of the Premises.  No reduction of Base Rent shall occur if the condemnation
does not apply to any portion of the Premises or does not  otherwise  materially
impair the operation of Tenant's business  therein.  Any award for the taking of
all or any part of the Premises under the power of eminent domain or any payment
made  under  threat of the  exercise  of such  power  shall be the  property  of
Landlord,  whether such award shall be made as  compensation  for  diminution of
value of the  leasehold or for the taking of the fee, or as  severance  damages;
provided, however, that Tenant shall be entitled to any compensation, separately
awarded to Tenant for Tenant's relocation expenses and/or loss of Tenant's Trade
Fixtures.  In the event that Tenant does not  terminate  this Lease by reason of
such condemnation,  Landlord shall provide Tenant, within thirty (30) days after
Landlord  shall  have  given  Tenant  written  notice of such  taking (or in the
absence of such notice,  within thirty (30) days after the condemning  authority
shall have taken  possession),  with  written  notice of the scope and nature of
Landlord's  proposed  repairs of any damage to the Premises,  if any,  caused by
such condemnation  authority, as reasonably determined by Landlord. If the scope
and nature of  Landlord's  proposed  repairs  contained  in such  notice are not
acceptable  to Tenant,  Tenant may within ten (10) days after  delivery  of such
notice  terminate  this Lease as of the date thirty (30) days following the date
of Landlord's notice of the scope and nature of Landlord's  proposed repairs. If
Tenant does not terminate this Lease,  Landlord shall repair such damage as soon
as reasonably  possible in substantial  conformance with the scope and nature of
the repairs set forth in Landlord's notice.


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15.    BROKERS' FEES.

       15.1 PROCURING  CAUSE. The Tenant's Broker named in Paragraph 1.10 is the
procuring cause of this Lease.

       15.2  REPRESENTATIONS AND WARRANTIES.  Tenant and Landlord each represent
and  warrant to the other that it has had no  dealings  with any  person,  firm,
broker or finder other than as named in Paragraph  1.10 in  connection  with the
negotiation  of  this  Lease  and/or  the   consummation   of  the   transaction
contemplated  hereby,  and that no broker or other person,  firm or entity other
than said named  Broker(s)  is entitled  to any  commission  or finder's  fee in
connection  with said  transaction.  Tenant and Landlord do each hereby agree to
indemnify,  protect,  defend  and  hold the  other  harmless  from  and  against
liability for  compensation  or charges which may be claimed by any such unnamed
broker,  finder or other  similar  party by reason of any dealings or actions of
the indemnifying Party,  including any costs,  expenses,  and/or attorneys' fees
reasonably incurred with respect thereto.

16.    TENANCY AND FINANCIAL STATEMENTS.

       16.1 TENANCY STATEMENT.  Each Party (as "RESPONDING  PARTY") shall within
ten (10) days after written notice from the other Party (the "REQUESTING PARTY")
execute, acknowledge and deliver to the Requesting Party an estoppel certificate
in reasonable and customary form and substance  ("ESTOPPEL  CERTIFICATE")  which
may include such additional  information,  confirmation and/or statements as may
be reasonably requested by the Requesting Party or by any lender of a Requesting
Party.

       16.2 FINANCIAL STATEMENT.  If Landlord desires to finance,  refinance, or
sell the Premises or the Building or any part  thereof,  Tenant shall deliver to
any  potential  lender  or  purchaser  designated  by  Landlord  such  financial
statements of Tenant as may be reasonably  required by such lender or purchaser,
including but not limited to Tenant's  financial  statements  for the past three
(3) years. All such financial  statements shall be received by Landlord and such
lender or purchaser in confidence and shall be used only for the purposes herein
set forth.  As long as Tenant is a publicly-held  company,  Tenant's most recent
annual  report  and all  quarterly  reports  published  (or  otherwise  publicly
disseminated) shall be sufficient for the requirements of this Paragraph 16.2.

17.  LANDLORD'S  LIABILITY.  The term  "LANDLORD"  as used herein shall mean the
owner or owners at the time in question of the fee title to the Premises. In the
event of a transfer of  Landlord's  title or interest in the Premises or in this
Lease,  Landlord  shall  deliver to the  transferor  or assignee  (in cash or by
credit)  any  unused  Security  Deposit  held by  Landlord  at the  time of such
transfer or  assignment.  Upon such transfer or  assignment  and delivery of the
Security  Deposit,  as  aforesaid,  the  prior  Landlord  shall be  relieved  of
liability  with respect to the  obligations  and/or  covenants  under this Lease
thereafter  to be  performed  by the  Landlord.  Subject to the  foregoing,  the
obligations and/or covenants in this Lease to be performed by the Landlord shall
be binding only upon the Landlord as hereinabove defined.

18.  SEVERABILITY.  The invalidity of any provision of this Lease, as determined
by a court of competent jurisdiction, shall in no way affect the validity of any
other provision hereof.

19.  INTEREST ON PAST-DUE  OBLIGATIONS.  Any  monetary  payment due  Landlord or
Tenant hereunder, other than Tenant's late charges, not received by the party to
whom such payment is due within ten (10) days following the date on which it was
due,  shall bear  interest  from the date due at the prime  rate  charged by the
largest state chartered bank in the state in which the Premises are located plus
four percent (4%) per annum,  but not exceeding the maximum rate allowed by law.
In the event  Landlord is  entitled  to a late  charge  from Tenant  pursuant to
Paragraph 13.4, such interest shall be payable by Tenant to Landlord in addition
to such late charge.

20. TIME OF ESSENCE.  Time is of the essence with respect to the  performance of
all obligations to be performed or observed by the Parties under this Lease.

21. RENT DEFINED. All monetary obligations of Tenant to Landlord under the terms
of this Lease are deemed to be rent.

22. NO PRIOR OR OTHER  AGREEMENTS  BROKER  DISCLAIMER.  This Lease  contains all
agreements  between the Parties with respect to any matter mentioned herein, and
no other prior or contemporaneous agreement or understanding shall be effective.
Landlord and Tenant each  represents and warrants to Tenant's Broker that it has
made and is relying solely upon its own investigation as to the nature, quality,
character and financial  responsibility  of the other Party to this Lease and as
to the nature,  quality and  character of the Premises.  Tenant's  Broker has no
responsibility  with  respect  thereto or with  respect to any default or breach
hereof by  either  Party.  Tenant's  Broker  shall be an  intended  third  party
beneficiary of the provisions of this Paragraph 22.

23.    NOTICES.

       23.1 NOTICE REQUIREMENTS. All notices required or permitted by this Lease
shall be in writing and may be  delivered  in person (by hand or by messenger or
courier service) or may be sent by certified or registered mail,  return receipt
requested,  with postage prepaid,  or nationally  recognized  overnight delivery
service, or by facsimile transmission during normal business hours, and shall be
deemed  sufficiently given if served in a manner specified in this Paragraph 23.
The addresses noted adjacent to a Party's  signature on this Lease shall be that
Party's address for delivery or mailing of notice purposes.  Either Party may by
written notice to the other specify a different  address for notice purposes.  A
copy of all notices  required  or  permitted  to be given to Landlord  hereunder
shall be concurrently  transmitted to such party or parties at such addresses as
Landlord may from time to time hereafter designate by written notice to Tenant.

       23.2 DATE OF NOTICE.  Any notice sent by  registered  or certified  mail,
return receipt requested, shall be deemed given on the date of delivery shown on
the receipt card, or if no delivery date is shown, the postmark thereon; failure
to accept delivery shall be deemed effective delivery.  If sent by regular mail,
the  notice  shall be deemed  given  forty-eight  (48)  hours  after the same is
addressed as required herein and mailed with postage prepaid.  Notices delivered
by overnight  courier that  guarantees  next day delivery  shall be deemed given
twenty-four (24) hours after delivery of the same to the courier.  If any notice
is transmitted  by facsimile  transmission  or similar means,  the same shall be
deemed served or delivered upon

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telephone  or facsimile  confirmation  of receipt of the  transmission  thereof,
provided a copy is also  delivered  via personal  delivery or mail. If notice is
received  on a  Saturday  or a Sunday  or a legal  holiday,  it shall be  deemed
received on the next business day.

24. WAIVERS. No waiver by a Party (the "WAIVING PARTY") of the Default or Breach
of any term,  covenant or condition hereof by the other Party (the  "NON-WAIVING
PARTY"),  shall be deemed a waiver  of any other  term,  covenant  or  condition
hereof,  or of any subsequent  Default or Breach by the Non-Waiving Party of the
same or any other  term,  covenant or  condition  hereof.  The  Waiving  Party's
consent  to,  or  approval  of,  any such act  shall  not be  deemed  to  render
unnecessary the obtaining of the Waiving Party's consent to, or approval of, any
subsequent or similar act by the Non-Waiving Party, or be construed as the basis
of an estoppel to enforce the provision or  provisions  of this Lease  requiring
such consent.  Regardless of the Landlord's  knowledge of a Default or Breach at
the time of accepting  rent,  the  acceptance of rent by Landlord shall not be a
waiver of any Default or Breach by Tenant of any provision  hereof.  Any payment
given  Landlord  by Tenant may be  accepted  by Landlord on account of moneys or
damages due Landlord,  notwithstanding  any qualifying  statements or conditions
made by Tenant in connection therewith,  which such statements and/or conditions
shall be of no force or  effect  whatsoever  unless  specifically  agreed  to in
writing by Landlord at or before the time of deposit of such payment.

25.  RECORDING.  Subject to the prior  written  approval of  Landlord's  lender,
either Landlord or Tenant shall, upon request of the other, execute, acknowledge
and  deliver to the other a short form  memorandum  of this Lease for  recording
purposes.  The Party requesting  recordation shall be responsible for payment of
any fees or taxes applicable thereto.

26.  NO RIGHT TO  HOLDOVER.  Tenant  has no right to  retain  possession  of the
Premises or any part thereof  beyond the  expiration or earlier  termination  of
this Lease.  In the event that Tenant holds over in violation of this  Paragraph
26 then the Base  Rent  payable  from and after  the time of the  expiration  or
earlier  termination  of this Lease  shall be  increased  to one  hundred  fifty
percent  (150%)  of the  Base  Rent  applicable  during  the  month  immediately
preceding such expiration or earlier termination. Nothing contained herein shall
be construed as a consent by Landlord to any holding over by Tenant.

27.  CUMULATIVE  REMEDIES.  No  remedy  or  election  hereunder  shall be deemed
exclusive but shall, wherever possible, be cumulative with all other remedies at
law or in equity.

28.  COVENANTS AND  CONDITIONS.  All  provisions of this Lease to be observed or
performed by Landlord or Tenant are both covenants and conditions.

29. BINDING EFFECT; CHOICE OF LAW. This Lease shall be binding upon the Parties,
their  personal  representatives,  successors and assigns and be governed by the
laws of the State in which the Premises are located.  Any litigation between the
Parties hereto  concerning  this Lease shall be initiated in the county in which
the Premises are located.

30.    SUBORDINATION; ATTORNMENT; NON-DISTURBANCE.

       30.1 SUBORDINATION. Subject to the conditions of Paragraph 11 of Addendum
"A"  hereto,  this  Lease and any Option  granted  hereby  shall be subject  and
subordinate to any ground lease, mortgage, deed of trust, or other hypothecation
or security device (collectively, "SECURITY DEVICE"), now or hereafter placed by
Landlord upon the real property of which the Premises are a part, to any and all
advances  made on the  security  thereof,  and to all  renewals,  modifications,
consolidations,  replacements  and  extensions  thereof.  Tenant agrees that the
Lenders  holding  any such  Security  Device  shall have no duty,  liability  or
obligation to perform any of the  obligations of Landlord under this Lease,  but
that in the event of  Landlord's  default with  respect to any such  obligation,
Tenant will give any Lender whose name and address have been furnished Tenant in
writing for such  purpose  notice of  Landlord's  default  pursuant to Paragraph
13.5.  If any Lender  shall elect to have this Lease  and/or any Option  granted
hereby superior to the lien of its Security Device and shall give written notice
thereof to Tenant,  this Lease and such  Options  shall be deemed  prior to such
Security  Device,  notwithstanding  the relative dates of the  documentation  or
recordation thereof.

       30.2 ATTORNMENT.  Subject to the non-disturbance  provisions of Paragraph
30.3,  Tenant  agrees to attorn  to a Lender  or any  other  party who  acquires
ownership of the Premises by reason of a foreclosure of a Security  Device,  and
that in the event of such  foreclosure,  such new owner shall not: (i) be liable
for any act or omission of any prior lessor or with respect to events  occurring
prior to  acquisition  of ownership,  (ii) be subject to any offsets or defenses
which  Tenant  might  have  against  any  prior  lessor,  or  (iii)  be bound by
prepayment of more than one month's rent.

       30.3  NON-DISTURBANCE.  With respect to Security  Devices entered into by
Landlord after the execution of this lease, Tenant's subordination of this Lease
shall be subject to receiving assurance (a "NON-DISTURBANCE AGREEMENT") from the
Lender that Tenant's possession and this Lease,  including any options to extend
the term hereof, will not be disturbed so long as Tenant is not in Breach hereof
and attorns to the record owner of the Premises.

       30.4 SELF-EXECUTING.  The agreements contained in this Paragraph 30 shall
be effective without the execution of any further documents;  provided, however,
that upon written  request from Landlord or a Lender in connection  with a sale,
financing or  refinancing  of Premises,  Tenant and Landlord  shall execute such
further writings as may be reasonably  required to separately  document any such
subordination or non subordination,  attornment and/or Non-Disturbance Agreement
as is provided for herein.

31.  ATTORNEYS' FEES. If any Party brings an action or proceeding to enforce the
terms hereof or declare rights  hereunder,  the  Prevailing  Party (as hereafter
defined) in any such proceeding, action, or appeal thereon, shall be entitled to
reasonable  attorneys'  fees.  Such  fees may be  awarded  in the  same  suit or
recovered  in a separate  suit,  whether  or not such  action or  proceeding  is
pursued to decision or judgment.  The term  "PREVAILING  PARTY"  shall  include,
without  limitation,  a Party who  substantially  obtains or defeats  the relief
sought, as the case may be, whether by compromise,  settlement, judgment, or the
abandonment by the other Party of its claim or defense. The attorneys' fee award
shall not be computed in accordance  with any court fee  schedule,  but shall be
such as to fully reimburse all reasonable attorneys' fees incurred.


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32. LANDLORD'S ACCESS; SHOWING PREMISES; REPAIRS. Landlord and Landlord's agents
shall  have the  right to enter  the  Premises  at any  time,  in the case of an
emergency  (provided  that Landlord  shall give Tenant notice of such  emergency
promptly after such entry), and otherwise at reasonable times for the purpose of
showing the same to prospective purchasers,  lenders, or tenants, and performing
such maintenance and making such alterations, repairs, improvements or additions
to the Premises or to the Building,  as Landlord may  reasonably  deem necessary
and as otherwise  required under this Lease.  Except in the case of an emergency
or  normal  maintenance  and  repairs,  Tenant  shall  be  permitted  to  have a
representative  of  Tenant  accompany  such   inspections,   provided  that  the
non-availability of a Tenant  representative shall not delay or prevent Landlord
from performing  such an inspection.  Landlord may at any time place on or about
the Building  any ordinary  "FOR SALE" signs and Landlord may at any time during
the last one hundred  eighty (180) days of the term hereof place on or about the
Building any ordinary "FOR LEASE" signs.  All such  activities of Landlord shall
be without abatement of rent or liability to Tenant.

33.  AUCTIONS.  Tenant shall not  conduct,  nor permit to be  conducted,  either
voluntarily or involuntarily, any auction upon the Premises without first having
obtained  Landlord's  prior  written  consent.  Notwithstanding  anything to the
contrary in this Lease, Landlord shall not be obligated to exercise any standard
of reasonableness in determining whether to grant such consent.

34. SIGNS.  Tenant shall not place any sign upon the exterior of the Premises or
the Building,  except that Tenant may, with  Landlord's  prior written  consent,
install  (but not on the  Building)  such signs as are  reasonably  required  to
advertise  Tenant's  own  business  so  long  as such  signs  are in a  location
designated by Landlord and comply with Applicable  Requirements and such signage
criteria as may be reasonably promulgated for the Industrial Center by Landlord.
The  installation  of any sign on the Premises by or for Tenant shall be subject
to the provisions of Paragraph 7 (Maintenance,  Repairs,  Utility Installations,
Trade  Fixtures and  Alterations).  Unless  otherwise  expressly  agreed herein,
Landlord  reserves  air rights to the use of the roof of the  Building,  and the
right to install advertising signs on the Building, including the roof, which do
not unreasonably interfere with the conduct of Tenant's business; Landlord shall
be entitled to all revenues from such advertising signs.

35.  TERMINATION;  MERGER.  Unless  specifically  stated otherwise in writing by
Landlord,  the voluntary or other surrender of this Lease by Tenant,  the mutual
termination  or  cancellation  hereof,  or a termination  hereof by Landlord for
Breach by Tenant, shall automatically terminate any sublease or lesser estate in
the  Premises;  provided,  however,  Landlord  shall,  in the  event of any such
surrender,  termination or cancellation,  have the option to continue any one or
all of any  existing  subtenancies.  Landlord's  failure  within  ten (10)  days
following  any such event to make a written  election to the contrary by written
notice to the holder of any such lesser interest,  shall  constitute  Landlord's
election to have such event constitute the termination of such interest.

36.    CONSENTS.

       (a) Except for Paragraph 33 hereof  (Auctions)  or as otherwise  provided
herein,  wherever  in this Lease the consent of a Party is required to an act by
or for the other  Party,  such  consent  shall not be  unreasonably  withheld or
delayed.  Tenant's actual reasonable out-of-pocket costs and expenses (including
but not limited to architects',  attorneys',  engineers' and other  consultants'
fees)  incurred in the  consideration  of, or response to, a request by Landlord
for any Tenant consent pertaining to Landlord's Alterations, compliance with FDA
requirements or any Tenant consents under Paragraph 42 (as long as such consents
are not required as a result of Tenant's  particular  use of, or  Alterations or
additions  to the  Premises,  Building or  Industrial  Center)  shall be paid by
Landlord  to Tenant  upon  receipt of an invoice  and  supporting  documentation
therefor.   Landlord's  actual  reasonable   out-of-pocket  costs  and  expenses
(including  but not limited to  architects',  attorneys',  engineers'  and other
consultants'  fees) incurred in the  consideration of, or response to, a request
by Tenant for any Landlord  consent  pertaining  to this Lease or the  Premises,
including  but not limited to  consents to an  assignment  a  subletting  or the
presence  or use of a Hazardous  Substance,  shall be paid by Tenant to Landlord
upon receipt of an invoice and supporting  documentation  therefor. In the event
that  Landlord's  liability  associated  with the  action  for which  Landlord's
consent is requested by Tenant is reasonably estimated by Landlord to exceed the
amount held by Landlord as the Security Deposit, then it shall be reasonable for
Landlord to require, as a condition to Landlord's consent to any such request by
Tenant, that Tenant deposit with Landlord an amount of money (in addition to the
Security  Deposit held under  Paragraph 5) reasonably  calculated by Landlord to
represent  Landlord's excess liability not covered by the amount of the Security
Deposit.  Any unused  portion of said  additional  deposit  shall be refunded to
Tenant without interest. Landlord's consent to any act, assignment of this Lease
or subletting of the Premises by Tenant shall not  constitute an  acknowledgment
that no Default or Breach by Tenant of this Lease exists, nor shall such consent
be deemed a waiver of any then  existing  Default  or  Breach,  except as may be
otherwise  specifically  stated  in  writing  by  Landlord  at the  time of such
consent.

       (b) All  conditions  to Landlord's  consent  authorized by this Lease are
acknowledged  by Tenant as being  reasonable.  The failure to specify herein any
particular condition to Landlord's consent shall not preclude the impositions by
Landlord at the time of consent of such further or other  conditions as are then
reasonable  with reference to the  particular  matter for which consent is being
given.

37.  INTENTIONALLY DELETED.

38.  QUIET  POSSESSION.  Upon payment by Tenant of the rent for the Premises and
the  performance of all of the covenants,  conditions and provisions on Tenant's
part to be observed  and  performed  under this Lease,  Tenant  shall have quiet
possession  of the  Premises  for the entire term  hereof  subject to all of the
provisions of this Lease.  Landlord covenants and agrees to act in good faith to
coordinate its construction  activities in the Building, if any, with Tenant and
to act  reasonably in performing  such  construction  so as to not  unreasonably
interfere with Tenant's  Permitted Use of the Premises.  Tenant agrees to act in
good faith to permit Landlord to perform its construction in a reasonable manner
and at reasonable  times in order to allow  Landlord to avoid  interfering  with
Tenant's Permitted Use of the Premises.

39.    OPTIONS.

       39.1  DEFINITION.  As used in  this  Lease,  the  word  "OPTION"  has the
following  meaning:  (a) the right to extend  the term of this Lease or to renew
this Lease or to extend or renew any lease that Tenant has on other  property of
Landlord;  (b) the right of first  refusal to lease the Premises or the right of
first offer to lease the Premises or the right of first refusal


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<PAGE>
to lease  other  property of Landlord or the right of first offer to lease other
property of Landlord;  (c) the right to purchase the  Premises,  or the right of
first refusal to purchase the Premises,  or the right of first offer to purchase
the Premises,  or the right to purchase other property of Landlord, or the right
of first refusal to purchase other  property of Landlord,  or the right of first
offer to purchase other property of Landlord.

       39.2 OPTIONS PERSONAL TO ORIGINAL  TENANT.  Each Option granted to Tenant
in this Lease is personal to the original  Tenant named in Paragraph 1.1 hereof,
and cannot be voluntarily or  involuntarily  assigned or exercised by any person
or entity other than said original  Tenant or a Permitted  Transferee  while the
original Tenant is in full and actual possession of the Premises and without the
intention of thereafter  assigning or subletting.  The Options,  if any,  herein
granted to Tenant are not assignable (except to a Permitted Transferee),  either
as a part of an assignment of this Lease or separately or apart  therefrom,  and
no Option may be  separated  from this Lease in any manner,  by  reservation  or
otherwise.

       39.3 MULTIPLE OPTIONS.  In the event that Tenant has any multiple Options
to extend or renew this Lease,  a later option  cannot be  exercised  unless the
prior Options to extend or renew this Lease have been validly exercised.

       39.4 EFFECT OF DEFAULT ON OPTIONS.

                (a)  Tenant   shall  have  no  right  to   exercise  an  Option,
notwithstanding any provision in the grant of Option to the contrary: (i) during
the period  commencing  with the giving of any notice of Default under Paragraph
13.1 and  continuing  until the  noticed  Default is cured,  or (ii)  during the
period  of time any  monetary  obligation  due  Landlord  from  Tenant is unpaid
(without regard to whether notice thereof is given Tenant),  or (iii) during the
time  Tenant is in Breach of this  Lease,  or (iv) in the event that  Tenant has
materially  defaulted  under  Paragraph  13.1 three (3) or more times during the
twelve  (12) month  period  immediately  preceding  the  exercise of the Option,
whether or not the Defaults are cured.

                (b) All rights of Tenant under the provisions of an Option shall
terminate and be of no further force or effect, notwithstanding Tenant's due and
timely exercise of the Option if after such exercise and during the term of this
Lease, (i) Tenant fails to pay to Landlord a monetary obligation of Tenant for a
period of thirty  (30) days after  such  obligation  becomes  due  (without  any
necessity  of  Landlord  to give  notice  thereof  to  Tenant),  or (ii)  Tenant
materially  defaults  under  Paragraph  13.1 three (3) or more times  during any
twelve (12) month  period,  whether or not the Defaults  are cured,  or (iii) if
Tenant commits a Breach of this Lease.

40.  RULES AND  REGULATIONS.  Tenant  agrees that it will abide by, and keep and
observe all reasonable  rules and regulations  ("RULES AND  REGULATIONS")  which
Landlord  may make  from  time to time for the  management,  safety,  care,  and
cleanliness  of the  grounds,  the parking  and  unloading  of vehicles  and the
preservation of good order, as well as for the convenience of other occupants or
tenants of the Building and the Industrial  Center and their invitees.  Landlord
agrees that it shall abide by, keep and observe the Rules and Regulations in its
occupancy  of the  Building,  in the  event  that  Landlord  occupies  any other
premises of the Building during the Term of this Lease.

41. SECURITY MEASURES. Security services or measures provided by Landlord to the
Building  are  provided  to  Tenant  without  warrranty  by  Landlord  as to the
effectiveness of such services or measures to protect the Premises,  Tenant, its
agents and invitees and their property against the acts of third parties.

42.  RESERVATIONS.  Landlord  reserves the right,  from time to time,  to grant,
without the consent or joinder of Tenant, such easements, rights of way, utility
race ways,  and  dedications  that Landlord  deems  necessary,  and to cause the
recordation of parcel maps and  restrictions;  provided that any such easements,
rights  of way,  utility  raceways,  dedications,  maps and  restrictions  which
materially  interfere  with the use of the  Premises  by  Tenant  or  materially
increase Tenant's monetary  obligations under this Lease shall not be granted by
Landlord  without  Tenant's  consent  (except  that such  limitations  shall not
prevent  Landlord  granting an interest in the  Industrial  Center in compliance
with  Applicable  Requirements).  If Landlord seeks to make any of the foregoing
changes  which  require  Tenant's   consent,   Tenant's  consent  shall  not  be
unreasonably delayed or withheld. Tenant agrees to sign any documents reasonably
requested by Landlord to effectuate any such easement rights, dedication, map or
restrictions.

43.  PERFORMANCE  UNDER PROTEST.  If at any time a dispute shall arise as to any
amount or sum of money to be paid to the other under the provisions  hereof, the
Party against whom the  obligation  to pay the money is asserted  shall have the
right to make payment "under  protest" and such payment shall not be regarded as
a voluntary  payment and there shall survive the right on the part of said Party
to institute  suit for recovery of such sum. If it shall be adjudged  that there
was no legal  obligation  on the part of said  Party to pay such sum or any part
thereof,  said Party shall be entitled to recover such sum or so much thereof as
it was not legally required to pay under the provisions of this Lease.

44.  AUTHORITY.  If either Party hereto is a corporation,  trust,  or general or
limited  partnership,  each  individual  executing  this Lease on behalf of such
entity  represents and warrants that he or she is duly authorized to execute and
deliver  this  Lease  on its  behalf.  If  Tenant  is a  corporation,  trust  or
partnership,  Tenant  shall within  thirty (30) days after  request by Landlord,
deliver to Landlord evidence satisfactory to Landlord of such authority.

45. CONFLICT.  Any conflict between the printed provisions of this Lease and the
typewritten or handwritten  provisions shall be controlled by the typewritten or
handwritten provisions.

46. OFFER.  Preparation of this Lease by either Landlord or Tenant or Landlord's
agent or Tenant's  agent and  submission of same to Tenant or Landlord shall not
be deemed an offer to lease.  This Lease is not  intended  to be  binding  until
executed and delivered by all Parties hereto.

47. AMENDMENTS. This Lease may be modified only in writing signed by the parties
in interest at the time of the modification.  The Parties shall amend this Lease
from time to time to reflect any  adjustments  that are made to the Base Rent or
other rent payable under this Lease.  As long as they do not  materially  change
Tenant's   obligations   hereunder   Tenant  agrees  to  make  such   reasonable
non-monetary  modifications  to this Lease as may be  reasonably  required by an
institutional  insurance  company or pension plan Lender in connection  with the
obtaining of normal financing or refinancing

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of the property of which the Premises are a part;  provided that Landlord  shall
reimburse  Tenant  its  reasonable  actual  out-of-pocket  legal  fees and costs
associated with such modification up to an amount of $1,000 per request.

48. MULTIPLE  PARTIES.  Except as otherwise  expressly  provided herein, if more
than one person or entity is named  herein as either  Landlord  or  Tenant,  the
obligations   of  such   multiple   parties  shall  be  the  joint  and  several
responsibility  of all  persons or  entities  named  herein as such  Landlord or
Tenant.

49. COUNTERPARTS. This Lease may be executed in any number of counterparts, each
of which  shall be  deemed to be an  original  and all of which  together  shall
comprise but a single instrument.








                [Remainder of This Page Intentionally Left Blank]







<PAGE>

LANDLORD AND TENANT HAVE  CAREFULLY  READ AND REVIEWED  THIS LEASE AND EACH TERM
AND PROVISION  CONTAINED  HEREIN,  AND BY THE EXECUTION OF THIS LEASE SHOW THEIR
INFORMED AND VOLUNTARY  CONSENT  THERETO.  THE PARTIES HEREBY AGREE THAT, AT THE
TIME THIS LEASE IS EXECUTED, THE TERMS OF THIS LEASE ARE COMMERCIALLY REASONABLE
AND EFFECTUATE THE INTENT AND PURPOSE OF LANDLORD AND TENANT WITH RESPECT TO THE
PREMISES.


The  parties  hereto  have  executed  this  Lease at the  place and on the dates
specified above their respective signatures.


Executed at:  San Diego, CA            Executed at  La Jolla, California

on:  7/18/96                           on:  7/17/96


By LANDLORD:                           By TENANT:


MATRIX PHARMACEUTICAL, INC.            ADVANCED TISSUE SCIENCES, INC.
a Delaware corporation                 a Delaware corporation

     RONALD P. LYNCH                         ARTHUR J. BENVENUTO
By:________________________            By:________________________

     Ronald P. Lucas                         Arthur J. Benvenuto
Name:______________________            Name:__________________________________

     V.P. of Operations                      Chairman and CEO
Title:_____________________            Title:_____________________

Address:  34700 Campus Drive           Address:  10933 North Torrey Pines Road
          Fremont, California 94555              La Jolla, California  92037


Telephone:  (510) 742-9900             Telephone:  (619) 450-5730

Facsimile:  (510) 742-8510             Facsimile:  (619) 450-5732


<PAGE>


                                  ADDENDUM "A"

                   TO INDUSTRIAL/COMMERCIAL MULTI-TENANT LEASE

                                     BETWEEN

               MATRIX PHARMACEUTICAL, INC., A DELAWARE CORPORATION

                                       AND

                         ADVANCED TISSUE SCIENCES, INC.
                             A DELAWARE CORPORATION


       This Addendum "A" to Lease  ("Lease  Addendum") is attached to and made a
part of that certain INDUSTRIAL MULTI-TENANT LEASE, dated July 15, 1996, made by
and between MATRIX PHARMACEUTICAL,  INC., a Delaware corporation, as "Landlord,"
and ADVANCED TISSUE  SCIENCES,  INC., a Delaware  corporation,  as "Tenant" (the
"LEASE"),  and constitutes  additional  covenants and agreements  thereto as set
forth in the  Lease,  with the  covenants  and  agreements  contained  herein to
prevail in the event of any  conflicts  between  the  covenants  and  agreements
contained herein and those in the Lease.


THE FOLLOWING ADDENDA  PARAGRAPHS 1 THROUGH 14 ARE HEREBY  INCORPORATED INTO THE
LEASE.

1. BASE RENT SCHEDULE:  Tenant shall pay Base Rent for the Premises according to
the schedule outlined below:

       Months 1 - 12:                     $119,025.00/month
       Months 13 - 24:                    $123,786.00/month
       Each six-month
       Option Term:                       $128,737.44/month

2. ROOM 114.  Tenant  shall have the right to use, on a  non-preferential  space
available  basis in  conjunction  with  Landlord  and any other  tenants  of the
Building,  Room 114 located on the first floor of the Building and  indicated on
Exhibit "A" ("ROOM 114"), for purposes  reasonably related to Tenant's Permitted
Use.  Scheduling  of Room 114 will be handled by Landlord,  through the Building
Receptionist,  on a  non-preferential  space  available  basis by Tenant's prior
reservation of Room 114 at least 24 hours in advance.

3. OPTION TO EXTEND. Tenant shall have two (2) consecutive options to extend the
Term of this Lease for one (1) additional period of six (6) months each (each of
such options are referred to herein  individually as a "Premises  Option").  The
period of each of the Premises  Options is referred to herein  individually as a
"Option  Term".  Tenant shall have no right or interest to exercise the Premises
Option unless,  not later than one hundred twenty (120) days prior to the end of
the then-current  Term or Option Term, Tenant provides Landlord with (a) written
notice  of its  exercise  of  the  Premises  Option  (the  "Extension  Notice").
Furthermore,  Tenant  shall have no right or interest to exercise  either of the
Premises  Options  unless:  (a) no uncured Breach has occurred and is continuing
under  this  Lease and no Breach on the part of Tenant  under this Lease is then
continuing under the Lease; and (b) during the term of the Lease, (i) Tenant has
not filed for or sought protection under any bankruptcy statute, and (ii) Tenant
has not failed to obtain a vacation from any involuntary  bankruptcy  proceeding
within one  hundred  twenty  (120) days  after  such  filing.  All of the terms,
covenants, conditions, provisions and agreements of the Lease shall apply to the
Option Term. Time is of the essence with respect to Tenant's exercise of each of
the Premises Options. The period of time within which the Premises Option may be
exercised  shall not be extended or enlarged by reason of Tenant's  inability to
exercise the Premises Option because of the provisions of this Paragraph 3.

4. WORKER'S COMPENSATION  INSURANCE.  Tenant shall, at its own cost and expense,
keep and  maintain  in full  force  during  the term,  a policy or  policies  of
worker's compensation insurance, in statutory amounts and limits, and employer's
liability  insurance with limits as follows:  bodily injury each accident in the
amount of not less than One Million Dollars ($1,000,000),  bodily injury/disease
each employee in an amount not less than One Million Dollars ($1,000,000), and a
bodily  injury/disease  policy  limit  of not  less  than  One  Million  Dollars
($1,000,000).

5. SECURITY.  Tenant acknowledges that safety and security devices, services and
programs  provided by  Landlord,  which are  intended to deter crime and enhance
safety,  may not in given  instances  prevent theft or other  criminal  acts, or
insure  safety of persons  or  property.  The risk that any  safety or  security
device,  service or  program  may not be  effective,  or may  malfunction  or be
circumvented,  is  assumed  by Tenant  with  respect to  Tenant's  property  and
interests,  and Tenant  shall  obtain  insurance  coverage to the extent  Tenant
desires  additional  protection  against criminal acts and other losses.  Tenant
agrees to cooperate with any reasonable  safety or security program developed by
Landlord or  required by law.  Tenant  hereby  covenants  that Tenant and all of
Tenant's employees, agents, contractors and invitees shall limit their access to
such areas of the Building  and  Industrial  Center as may be made  available to
such  persons  by the use of such  security  access  cards  as are  provided  by
Landlord to Tenant.  Except for those doors which are internal to the  Premises,
Tenant shall

<PAGE>

not re-key any doors or change the card  access  system in any way  without  the
prior consent of Landlord,  whose consent  shall not be  unreasonably  withheld.
Tenant  shall,  however,  provide  Landlord  with copies of all keys to interior
doors of the Premises for emergency access.

6. ENVIRONMENTAL ASSESSMENT. Prior to the Commencement Date, Landlord shall have
conducted (or received from the immediately-preceding tenant of the Premises) an
"Entrance Assessment," consisting of an updated Phase I Environmental Assessment
and such other tests as are listed on the "Assessment  Criteria" attached hereto
as  Exhibit  "F",  by  an  environmental  consultant  reasonably  acceptable  to
Landlord.  A copy of such  Entrance  Assessment  shall be delivered to Tenant as
soon as  available  as  anticipated  by  Paragraph  3.3 of the  Lease,  and said
Assessment  shall be deemed to be the  baseline  environmental  condition of the
Premises  upon  Tenant's  occupancy.  To the  extent  such  Entrance  Assessment
indicates the existence of any Hazardous Substances in the Premises in violation
of Applicable  Requirements,  remediation of such Hazardous  Substance condition
shall be  performed  at  Landlord's  cost and  shall  be  remediated  as soon as
possible after the date Landlord  receives  notice of such  Hazardous  Substance
condition.  The cost of the Entrance Assessment shall be paid by Landlord. Prior
to  Tenant's   surrender  of  the  Premises,   Tenant  shall  conduct  an  "Exit
Assessment," consisting of an updated Phase I Environmental  Assessment and such
other tests as are listed on the Assessment  Criteria attached hereto as Exhibit
"F", by an environmental consultant selected by Tenant and reasonably acceptable
to  Landlord  and shall  include  Tenant's  biological  waste  storage  unit and
Tenant's  hazardous  and/or  radioactive  materials  storage  unit(s),  it  any.
Landlord shall receive a copy of the report(s) of the Exit Assessment,  and said
report(s)  shall be deemed the  environmental  condition  of the  Premises  upon
Tenant's  surrender of the Premises.  The cost of the Exit  Assessment  shall be
paid by Tenant.  The  Entrance  and Exit  Assessments  shall be  performed by an
independent  environmental consultant with expertise in performing environmental
analyses of biotechnology laboratory and manufacturing facilities.

7. HAZARDOUS  SUBSTANCES.  In further  definition of Tenant's  obligations under
Subparagraph 6.2 of the Lease, Tenant shall not allow any Hazardous Substance to
be used, generated,  manufactured,  released, stored or disposed of on, under or
about, or transported from, the Premises,  unless:  (a) such use is specifically
disclosed  to and  approved by Landlord in writing  prior to such use (either by
disclosure herein in Exhibit "D" or, after the Commencement  Date, by Landlord's
written  approval within ten (10) business days of delivery of Tenant's  written
request  for such  approval  to  Landlord);  and (b) such  use is  conducted  in
compliance with the provisions of Paragraph 6 of the Lease. Landlord may approve
such use subject to reasonable conditions to protect the Premises and Landlord's
interests.  Landlord may withhold its approval if Landlord reasonably determines
that such  proposed  use  involves a material  risk of a release or discharge of
Hazardous Substances in violation of any Applicable  Requirements or that Tenant
has not provided reasonable assurances of its ability to remedy such a violation
and fulfill its  obligations  under Paragraph 6 of the Lease and this Section 7.
Failure by Landlord to  reasonably  approve or  disapprove  Tenant's  use of any
Hazardous Substance proposed by Tenant within such 10-day period shall be deemed
Landlord's approval of such use in compliance with Paragraph 6 of the Lease.

       7.1  Remedial  Work.  Tenant  shall  perform  any  monitoring,   testing,
investigation,  clean-up,  removal,  detoxification,  preparation  of closure or
other required  plans and any other  remedial work required by any  governmental
agency or reasonably  recommended by Landlord or the  environmental  consultants
performing  the Exit  Assessment,  as a result of any  release or  discharge  or
potential  release  or  discharge  of  Hazardous  Substances  and  resulting  in
contamination or any violation or potential violation of Applicable Requirements
by Tenant or any  successor or subtenant of Tenant or their  respective  agents,
contractors,  employees, licensees or invitees (collectively,  "Remedial Work").
Landlord  shall  have the  right to  intervene  in any  governmental  action  or
proceeding  involving any Remedial Work, and to approve  performance of the work
(which  approval  shall not be  unreasonably  delayed or withheld),  in order to
reasonably  protect  Landlord's  interests.  Tenant  shall  not  enter  into any
settlement  agreement,  consent decree or other  compromise  with respect to any
claims relating to Hazardous Substances without notifying Landlord and providing
ample opportunity for Landlord to intervene.

       7.2 Compliance With Insurance Requirements.  Tenant shall comply with the
requirements of Landlord's and Tenant's insurers regarding Hazardous  Substances
and with such insurers'  recommendations  based upon prudent industry  practices
regarding management of Hazardous Substances.

       7.3 Indemnity. Tenant's indemnification obligations under the Lease shall
include the all of Landlord's reasonably  foreseeable  consequential damages and
the cost of any Remedial Work arising out of Hazardous  Substances  brought onto
the Industrial Center by or for Tenant, its successors and subtenants, or anyone
under Tenant's control.  Neither the consent by Landlord to the use, generation,
storage,  release,  disposal or transportation  of Hazardous  Substances nor the
strict  compliance  with all  Applicable  Requirements  shall excuse Tenant from
Tenant's  indemnification  obligations  pursuant  to  Paragraph  6 of the Lease.
Tenant's  indemnity  provisions of Subparagraph  6.2(c) of the Lease shall be in
addition to and not a limitation of the indemnification  provisions of Paragraph
8.7 of the Lease.  Tenant's obligations pursuant to Paragraph 6 of the Lease and
this  Section 7 shall  survive  the  termination  or  expiration  of the  Lease.
Landlord's  indemnification  obligations  under the  Subparagraph  6.2(c) of the
Lease shall include all of Tenant's reasonably foreseeable consequential damages
and the cost of any Remedial  Work arising out of Hazardous  Substances  brought
onto the  Industrial  Center  by or for  Landlord  or  anyone  under  Landlord's
control.  Landlord's  obligations  pursuant to Paragraph 6 of the Lease and this
Section 7 shall survive the termination or expiration of the Lease.


                                        2
<PAGE>

       7.4  Default.  The release or  discharge  of any  Hazardous  Substance in
violation  of  Applicable  Requirements  or  the  violation  of  any  Applicable
Requirements  by Tenant  or any  successor  or  subtenant  of Tenant  shall be a
Default by Tenant  under the Lease.  In addition  to or in lieu of the  remedies
available  under the Lease as a result of such  Default  (after  the  applicable
notice  and cure  periods,  if any),  Landlord  shall  have the  right,  without
terminating  the  Lease,  to  require  Tenant  to  suspend  its  operations  and
activities  on the  Premises  to the  extent  reasonably  necessary  to  protect
Landlord's  interest in the  Industrial  Center and until  Landlord is satisfied
that  appropriate  Remedial  Work  has been or is  being  adequately  performed;
Landlord's  election of this remedy shall not  constitute a waiver of Landlord's
right thereafter to declare a Default and pursue other remedies set forth in the
Lease.

8. RADIOACTIVE  MATERIALS/BIOHAZARD  WASTE STORAGE.  In addition to its lease of
the Premises,  and non-exclusive  rights to the Common areas,  Tenant shall have
the exclusive  right to use, in  accordance  with all  Applicable  Requirements,
Radioactive Materials Storage Unit 5 in the Industrial Center. Tenant shall also
have the  non-exclusive  right to install and operate,  in  accordance  with all
Applicable  Requirements,  a biohazard waste disposal bin for Tenant's exclusive
use on the Industrial Center,  for the temporary storage of biohazardous  waste.
Radioactive Materials Storage Unit 5 shall be located in its current location in
the Industrial  Center,  and the biohazard waste disposal bin shall be installed
by Tenant in a location  mutually  agreed upon by landlord and Tenant;  provided
that Landlord  shall have the right to relocate  Radioactive  Materials  Storage
Unit 5 and the biohazard waste disposal bin  (collectively,  the "UNITS") within
the Industrial  Center from time to time, as Landlord may  reasonably  determine
necessary  for  safe  and  efficient  operation  of the  Industrial  Center,  in
accordance with Applicable Requirements and at Landlord's sole cost and expense.
Notwithstanding anything to the contrary contained in the Lease, Tenant shall be
responsible for all fees and costs (including, without limitation, licensing and
permitting  fees) of  keeping  the Units in good  order,  condition  and  repair
(including,  without  limitation,  repairing  and  maintaining  all  safety  and
security  systems  associated with such Units) in accordance with all Applicable
Requirements.

       8.1 Notice.  Tenant shall  provide  Landlord  with written  notice of the
chemicals,  wastes and  substances  to be stored in the Units as an amendment to
Exhibit "D" hereto,  and shall comply with all Applicable  Requirements  and the
provisions of this Lease with respect to said Hazardous Substances.

       8.2 Surrender. At the earlier of the termination of the Lease or Tenant's
termination  of its use of any of the  Units,  Tenant  will  retain a  qualified
environmental  consultant,  at its sole cost, who is acceptable to Landlord,  to
perform an Exit  Assessment of  Radioactive  Materials  Storage Unit 5 and those
portions of the Common  Areas:  (a) where the biohazard  waste  disposal bin was
located prior to its removal,  and (b) over which the path of access between the
Premises and the Units was located.  Such Exit assessment shall consist of, at a
minimum,  Sections A.1 and B of the Exit  Assessment  Criteria in Exhibit "F" to
the Lease, and all additional  sampling and surveys necessary to assure that all
Hazardous  Substances,  including but not limited to any radioactive  materials,
have been removed from the Units.  Landlord shall be provided with a copy of the
such Exit Assessment as prepared by Tenant's consultant.

9.  CONFIDENTIALITY.  Unless  otherwise  agreed to in  writing by  Landlord  and
Tenant, each party shall keep confidential all confidential documents, financial
statements,  reports, assessments or other information provided to, or generated
by the other party relating to Landlord, Tenant and/or the Industrial Center and
shall not  disclose  any such  information  to any  person  other than (i) those
employees  and  agents  of  Landlord  and  Tenant   reasonably   receiving  such
information  for  valid  business  purposes;  (ii)  those who are  actively  and
directly participating in the evaluation of the Premises, Building or Industrial
Center or financing of the Building or Industrial  Center;  (iii)  governmental,
administrative,  regulatory or judicial  authorities in the investigation of the
compliance  of  the  Property  with  applicable  legal  requirements;  and  (iv)
representative(s)  of the Securities  Exchange  Commission ("SEC") to the extent
such information is required by any official request,  order, rule or regulation
of the SEC or applicable legal requirements. However, Tenant expressly covenants
and agrees  that  except as  required  by law,  it shall not  disclose  any code
compliance,  environmental  or other  regulatory  matters relating to Landlord's
interest  in the  Industrial  Center  or this  Lease  to  governmental  or other
authorities  without the express  prior written  approval by Landlord.  Upon the
expiration  or earlier  termination  of this Lease for any reason,  Tenant shall
promptly turn over to Landlord all confidential documents, financial statements,
reports,  assessments  or other  information  provided to Tenant by Landlord and
pertaining to Landlord's operations in the Industrial Center, obtained by Tenant
pursuant to this Lease.  The  provisions  of this  paragraph  shall  survive the
termination of this Lease.

10. LIMITATION OF LANDLORD'S  LIABILITY.  The obligations of Landlord under this
Lease shall not constitute  personal  obligations  of the individual  directors,
officers,  or shareholders  of Landlord,  and in  consideration  of the benefits
accruing  hereunder  to Tenant and  notwithstanding  anything  contained in this
Lease to the contrary, Tenant hereby covenants and agrees, for itself and all of
its successors and assigns,  that the liability of Landlord for its  obligations
under this Lease shall be limited  solely to, and Tenant's  and its  successors'
and assigns' sole and  exclusive  monetary  remedy shall be against,  Landlord's
interest in the Industrial Center (including,  without limitation,  the right to
offset against future payments of Base Rent (a) any claim finally adjudicated in
favor of Tenant or (b) any payments made by Tenant, for which Tenant is entitled
to  reimbursement  from Landlord in accordance  with the terms and conditions of
the  Lease).  Tenant  hereby  covenants  and  agrees,  for itself and all of its
successors  and  assigns,  that  Tenant  shall  not seek  recourse  against  the
individual  directors,  officers  or  shareholders  of  Landlord or any of their
personal assets for such satisfaction.


                                        3
<PAGE>

11. MORTGAGEE'S CONSENT.  This Lease is conditioned upon the written approval of
this Lease by the mortgagee of the Industrial Center as of the date of the Lease
(the Federal  Deposit  Insurance  Corporation as Receiver of The Merchants Bank)
and  Tenant  hereby  agrees to act  reasonably  in  negotiating  a  commercially
reasonable form of subordination,  non-disturbance and attornment agreement with
such mortgagee.  If such mortgagee refuses to consent to this Lease on or before
August 1, 1996,  this Lease shall  terminate  and  neither  party shall have any
continuing  obligation  to the other  with  respect to the  Premises;  provided,
however, that Landlord shall return the Security Deposit to Tenant.

12. RATIONING;  GOVERNMENT ACTION.  Notwithstanding  anything to the contrary in
this Lease, Landlord reserves the right to limit, restrict, or ration the use of
water,  electricity,  gas or any other  form of energy or any other  service  or
utilities  serving  the  Premises  or  the  Building,  in  compliance  with  the
requirements  of federal,  state or local  governmental  agencies,  or utilities
suppliers  in  reducing  energy or other  resources  consumption.  Tenant  shall
cooperate  reasonably with any voluntary energy conservation  program reasonably
initiated by Landlord in cooperation with the efforts of federal, state or local
governmental  agencies,  or utilities  suppliers in reducing the  consumption of
energy or other resources.  In addition,  Landlord shall not be liable to Tenant
nor shall this Lease be affected if any parking  privileges  appurtenant  to the
Premises are impaired by reason of any new moratorium,  initiative,  referendum,
statute,  regulation or other governmental decree or action, which is beyond the
reasonable  control of Landlord  and which could in any manner  prevent or limit
the  parking  rights of Tenant  hereunder.  In the event of any such  limitation
restriction  or  impairment  of  services  or  utilities  provided in this Lease
results from any Applicable  Requirement and materially interferes with Tenant's
Permitted  Use of the  Premises,  Tenant's  sole remedy  shall be the  equitable
abatement of Base Rent for the duration of the interruption or failure.

13. CORPORATE AUTHORITY. If Tenant executes the Lease as a corporation,  each of
the  persons  executing  the  Lease on behalf of  Tenant  hereby  covenants  and
warrants that: (i) Tenant is a duly  authorized and existing  corporation;  (ii)
Tenant is qualified to do business in the State of California;  (iii) Tenant has
full right and  authority to enter into the Lease;  and (iv) each of the persons
executing on behalf of Tenant is authorized  to do so. If Landlord  executes the
Lease as a  corporation,  each of the persons  executing  the Lease on behalf of
Landlord  hereby  covenants and warrants that: (i) Landlord is a duly authorized
and existing corporation; (ii) Landlord is qualified to do business in the State
of  California;  (iii)  Landlord has full right and  authority to enter into the
Lease;  and  (iv)  each of the  persons  executing  on  behalf  of  Landlord  is
authorized to do so.

14. NO  VIOLATIONS.  In addition  to any other  express  agreements  of Landlord
contained in the Lease, the following representations and warranties by Landlord
shall be true and correct as of the date of this  Lease:  To  Landlord's  actual
knowledge,  the  Premises  is  subject  to the  City  of  San  Diego  SR  zoning
requirements as of the date of this Lease, and neither Landlord's  entering into
the Lease nor Tenant's occupancy of the Premises nor the use of the Premises for
general office use and ordinary  scientific research in accordance with the City
of San Diego SR zoning requirements will in itself cause a material violation of
any governmental laws, ordinances,  rules,  regulations,  permits or restrictive
covenants,  including,  without  limitation,  those relating to safety,  health,
building,  fire and  zoning,  or any  judgments,  orders  or  decrees,  pending,
outstanding  or threatened  against the  Industrial  Center or against  Landlord
which would materially affect Tenant's use of the Premises or Landlord's ability
to perform its obligations under the Lease. To the best of Landlord's knowledge,
based upon Landlord's  title  insurance  policy for the Industrial  Center,  the
Federal  Deposit  Insurance  Corporation  as the Receiver for the Merchants Bank
holds the only mortgage encumbering the Industrial Center.

       IN WITNESS  WHEREOF,  the parties hereto have caused this Addendum "A" to
Lease to be executed on this 18th day of July, 1996.


LANDLORD:                               TENANT:

MATRIX PHARMACEUTICAL, INC.             ADVANCED TISSUE SCIENCES, INC.
a Delaware corporation                  a Delaware corporation


       RONALD P. LUCAS                          ARTHUR J. BENVENUTO
By:________________________             By:_____________________________

       Ronald P. Lucas                          Arthur J. Benvenuto
Name:______________________             Name:___________________________

       V.P. of Operations                       Chairman and CEO
Title:_____________________             Title:__________________________


                                        4
<PAGE>

                                   EXHIBIT "A"

                             BUILDING PLAN PREMISES
                                           --------

[HAND-DRAWN FLOOR PLAN WITH ROOM NUMBERS AND STAIRWAYS]



                                             LEGEND
                                             ------

                                / / / /  Common Areas of Building

<PAGE>


                                   EXHIBIT "A"

                             BUILDING PLAN PREMISES
                                           --------

[HAND-DRAWN  FLOOR PLAN WITH ROOM NUMBERS AND  STAIRWAYS,  INCLUDING  FIRE ALARM
SECURITY PANEL,  LUNCH PATIO AREA, FIRE  ANNOUNCLATOR  PANEL,  LOADING AREA, AND
BOILER ENCLOSURE AREA LOCATIONS.]



                                             LEGEND
                                             ------

                                / / / /  Common Areas of Building


<PAGE>



                                   EXHIBIT "B"


                              RULES AND REGULATIONS

       1. The  sidewalks,  entrances,  lobby,  elevators,  stairways  and public
corridors  shall be used only as a means of ingress and egress and shall  remain
unobstructed at all times. The entrance and exit doors of the Premises are to be
kept closed at all times except as required for orderly  passage to and from the
Premises.  Loitering in any part of the Building or  obstruction of any means of
ingress or egress shall not be permitted. Doors and windows shall not be covered
or obstructed.

       2. Plumbing  fixtures shall not be used for any purposes other than those
for which they were  constructed,  and no  rubbish,  newspapers,  trash or other
substances of any kind shall be thrown into them,  except as otherwise agreed in
writing by Landlord and Tenant.  Walls, floors and ceilings shall not be defaced
in any way and no one shall be permitted to mark,  drive nails,  screws or drill
into,  paint,  or in any way mar any  Building  surface,  except that  pictures,
certificates,  licenses and similar items normally used in Tenant's business may
be  carefully  attached to the walls by Tenant in a manner to be  prescribed  by
Landlord.  Upon removal of such items by Tenant any damage to the walls or other
surfaces, except minor nail holes, shall be repaired by Tenant.

       3. No awning,  shade,  sign,  advertisement or notice shall be inscribed,
painted,  displayed  or affixed on, in or to any window,  door or balcony or any
other part of the  outside or inside of the  Building  or the  demised  premises
unless  provided by  Landlord  or  approved  by  Landlord in writing.  No window
displays or other public  displays shall be permitted  without the prior written
consent of Landlord.  All tenant  identification on public corridor doors beyond
building standard will be installed by Landlord for Tenant but the cost shall be
paid by Tenant.  No  lettering  or signs  other than the name of Tenant  will be
permitted  on public  corridor  doors  with the size and type of  letters  to be
prescribed  by  Landlord.  The  directory  of  the  Building  will  be  provided
exclusively  for the display and location of Tenant only and  Landlord  reserves
the right to exclude all other names therefrom.  All requests for listing on the
Building  directory  shall be  submitted  to the office of  Landlord in writing.
Landlord  reserves  the  right to  approve  all  listing  requests.  Any  change
requested by Tenant of Landlord of the name or names posted on directory,  after
initial posting, will be charged to Tenant.

       4. The cost of any special electrical  circuits for items such as copying
machines, computers, microwaves, etc. (excluding those items listed in the Final
Plans  approved by Landlord),  shall be borne by Tenant unless the same are part
of the building standard  improvements.  Upon Landlord's  request,  Tenant shall
deliver to Landlord  within five (5) business days of such request a list of all
equipment  in the  Premises  (costing  in excess of $2,000 per item (or,  in the
event of  equipment  systems,  $2,000  per  system)),  which  shall  reflect  an
inventory of such equipment  performed no more than sixty (60) days prior to the
date such list is delivered to Landlord.

       5.  Tenant  shall not place a load upon any floor of the  Premises  which
exceeds the load per square foot which such floor is designed to carry and which
is then  allowed by law.  The weight,  size and  position of all safes and other
unusually  heavy  objects used or placed in the Building  shall be prescribed by
Landlord and shall, in all cases, stand on metal-plates of such size as shall be
prescribed  by  Landlord.  The  repair of any  damage  done to the  Building  or
property  therein by putting in or taking out or maintaining such safes or other
unusually heavy objects shall be paid for by Tenant.

       6. Except for Tenant's  initial move into to the Premises,  during normal
business hours Tenant shall not  intentionally  permit its freight,  fixtures or
other personal deliveries to block the entrance of the Building or the Premises,
impede  passage  through the entrance door or block any  passageways or doors in
the Building, nor shall Tenant permit its agents, employees or invitees to place
obstructions  in front of the  Building  or any  Building  doors  unless  due to
emergency and or scheduled necessary repairs. All freight,  furniture,  fixtures
and other personal  property shall be moved into, within and out of the Building
so as not  interfere  with any  other  tenant's  conduct  of  business  or quiet
enjoyment of the  Industrial  Center.  Except to the extent caused by Landlord's
active  negligence  or  willful  misconduct,   in  no  event  will  Landlord  be
responsible  for any loss or  damage to such  freight,  furniture,  fixtures  or
personal property from any cause.

       7. No  improper  noises,  vibrations  or odors will be  permitted  in the
Building.  No person will be  permitted to bring or keep within the Building any
animal,  bird or bicycle without  Landlord's prior  permission.  No person shall
throw trash, refuse, cigarettes or other substances of any kind any place within
or out of the Building except in the refuse containers provided therefor. Tenant
shall not be  permitted  to  interfere  in any way with  tenants or those having
business  with them.  Landlord  reserves  the right to exclude or expel from the
Building any person who, in the judgment of Landlord,  is  intoxicated  or under
the  influence  of  liquor  or drugs or who  shall in any  manner  do any act in
violation of the rules and regulations of the Industrial Center.

       8. Landlord shall provide  Tenant with an initial set of security  access
cards for the card access system, if any. All re-keying of office doors, changes
to the card  access  system and  replacement  of lost or stolen keys or security
access cards caused or initiated  by Tenant,  or any of its  employees,  agents,
invitees or contractors, after occupancy, will be at the expense of Tenant.


                                       B-1
<PAGE>

       9.  Tenant  shall not use the patios for  storage,  barbecues,  drying of
laundry or any other  activity  which would  detract from the  appearance of the
Building  or  Industrial  Center  or  interfere  in any way  with the use of the
Building or Industrial Center by other tenants.

       10.  If Tenant  uses the  Premises  after  regular  business  hours or on
non-business  days, Tenant shall lock any entrance doors to the Building used by
Tenant or take such other steps as are necessary to secure the Building's  doors
immediately after entering or leaving the Building.

       11.      INTENTIONALLY DELETED.

       12. If,  after  installation  of  Tenant's  initial  improvements  (which
initial  improvements  shall be deemed  installed by December 31, 1996),  Tenant
requires new or additional telegraphic,  telephonic, burglar or similar systems,
it  shall  first  obtain  Landlord's  approval,  which  approval  shall  not  be
unreasonably withheld.

       13. Tenant shall not waste  electricity,  water or  air-conditioning  and
agrees to cooperate  fully with Landlord to assure the most effective  operation
of the Building's  heating and  air-conditioning,  as Landlord shall  reasonably
determine.

       14. At  Landlord's  sole cost and  expense  (including  reimbursement  of
Tenant's expenses arising therefrom),  Landlord reserves the right,  exercisable
without  notice and without  liability to Tenant,  to change the name and street
address of the Building.

       15.      Tenant shall not retail any goods on the Premises.

       16. Tenant shall not install any radio or television antenna, loudspeaker
or other device on the roof or exterior walls of the Building.  Tenant shall not
interfere  with radio or  television  broadcasting  or reception  from or in the
Building  elsewhere.  Tenant  shall not  install,  maintain or operate  upon the
Premises  any  vending   machine   without  the  written  consent  of  Landlord.
Canvassing,  soliciting  and  distribution  of  handbills  or any other  written
material,  and peddling in the Building  are  prohibited,  and each tenant shall
cooperate to prevent same.

       17.  Tenant  shall  not use in any  space or in the  public  halls of the
Building any hand trucks except those equipped with rubber tires and side guards
or such other material-handling  equipment as Landlord may approve. Tenant shall
not bring any other vehicles of any kind into the Building.

       18. Tenant shall not park its vehicles in any parking areas designated by
Landlord as areas for parking by visitors to the Industrial Center. Tenant shall
not leave vehicles in the Industrial Center parking areas overnight nor park any
vehicles  in  the  Industrial  Center  parking  areas  other  than  automobiles,
motorcycles,  motor driven or non-motor driven bicycles or four-wheeled  trucks.
Landlord may, in its sole discretion,  designate separate areas for bicycles and
motorcycles.

       19. Landlord may waive any one or more of these Rules and Regulations for
the benefit of Tenant or any other tenant,  but no such waiver by Landlord shall
be construed as a waiver of such Rules and Regulations in favor of Tenant or any
other tenant, nor prevent Landlord from thereafter  enforcing any such Rules and
Regulations  against  any  or  all of the  tenants  of  the  Industrial  Center;
provided, however, that Landlord shall not unreasonably discriminate against any
tenant in making any such waiver.

       20. Tenant shall be deemed to have read these Rules and  Regulations  and
to have agreed to abide by them as a condition to his  occupancy of the Premises
and  shall be  responsible  for the  observance  of all the  rules  by  Tenant's
employees, agents, clients, customers, invitees and guests.

       21. The normal business hours of the Industrial Center shall be 7:00 a.m.
to 7:00 p.m., Monday through Friday, 8:00 a.m. to 12:00 p.m, Saturday,  holidays
excepted.  Receptionist  services shall be provided  between 8:00 a.m. and 12:00
p.m.,  and between  1:00 p.m. and 5:00 p.m.,  Monday  through  Friday,  holidays
excepted.  Unless  noticed  by  Landlord,  the  Building  shall be closed on the
following holidays:  President's Day, Memorial Day, Independence Day, Labor Day,
Thanksgiving  Day,  Christmas Day and New Year's Day.  Landlord shall publish to
all  tenants  from  time  to  time a list  of  holidays  to be  observed  by the
Industrial Center. Notwithstanding the foregoing, Tenant shall be allowed access
to its Premises 24 hours per day, 7 days per week.


                                       B-2
<PAGE>

                                   EXHIBIT "C"


                               EXISTING EQUIPMENT


   7/12/96            Lab Furn. (by Location)             Page 1


LOCATION            DESCRIPTION         MATRIX #            COMMENTS
  243     Bench, c-frame                2 each
  243     Exhaust snorkle               1 each
  243     Fume hood, 6 ft.                3254
  244     Bench, c-frame                1 each
  255     Bench, c-frame                1 each
  255     Bench, c-frame w/sink         1 each
  255     Bench, c-frame, porable       2 each
          w/wheels
  255     Exhaust snorkle               3 each
  262     Bench, cabinet                1 each
  262     Bench, photography paper      1 each
          storage
  262     Benchtops (no cabinets)        each
  262     Sink, darkroom photography    1 each
  263     Bench, c-frame                1 each
  263     Bench, c-frame w/sink         1 each
  263     Cabinet, glassware w/glass    1 each
          doors
  263     Exhaust snorkle               1 each
  263     Fume hood, 5 ft.                5185
  264     Bench, c-frame w/sink         1 each
  264     Bench, c-frame, portable      4 each
          w/wheels
  265     Bench, c-frame                2 each
  266     Bench, c-frame                1 each
  269     Bench, c-frame, center          3322
          island
  269     Bench, c-frame, center          3323
          island
  269     Bench, c-frame, center          3324
          island
  269     Bench, c-frame, center          3325
          island
  269     Bench, c-frame, center          3326
          island
  269     Bench, c-frame, center          3327
          island
  269     Bench, c-frame, center          3328
          island
  269     Bench, c-frame, center          3329
          island
  269     Bench, c-frame, center          5177
          island
  269     Bench, c-frame, center          5178
          island
  269     Bench, c-frame, center          5179
          island
  269     Bench, c-frame, center          5180
          island
  269     Bench, perimeter              2 each
  269     Bench, perimeter w/sink       6 each
  269     Bench, perimeter, 30" desk   26 each    Kneehole spaces -
                                                  continuous bench
  269     Cabinet, glassware w/glass    8 each
          doors
  269     Flammable storage cabinet,    1 each
          30" x 48"
  269     Freezer, upright - 20           3503
  269     Fume hood, 4 ft.                5181
  269     Fume hood, 5 ft.                3330
  269     Lab Chair, Cramer teal-blue     3152
  269     Lab Chair, Cramer teal-blue     3153
  269     Lab Chair, Cramer teal-blue     3154
  269     Lab Chair, Cramer teal-blue     3155
  269     Lab Chair, Cramer teal-blue     3156
  269     Lab Chair, Cramer teal-blue     3157
  269     Lab Chair, Cramer teal-blue     3158
  269     Lab Chair, Cramer teal-blue     3159
  269     Lab Chair, Cramer teal-blue     3160
  269     Lab Chair, Cramer teal-blue     3161
  269     Lab Chair, Cramer teal-blue     3162


                                       C-1
<PAGE>

   7/12/96            Lab Furn. (by Location)             Page 2


LOCATION            DESCRIPTION         MATRIX #            COMMENTS
  269     Lab Chair, Cramer teal-blue     3163
  269     Lab Chair, Cramer teal-blue     3164
  269     Lab Chair, Cramer teal-blue     3165
  269     Lab Chair, Cramer teal-blue     3166
  269     Lab Chair, Cramer teal-blue     3167
  269     Lab Chair, Cramer teal-blue     3168
  269     Lab Chair, Cramer teal-blue     3288
  269     Lab Chair, Cramer teal-blue     3289
  269     Lab Chair, Cramer teal-blue     3290
  269     Lab Chair, Cramer teal-blue     3291
  269     Lab Chair, Cramer teal-blue     3292
  269     Lab Chair, Cramer teal-blue     3293
  269     Lab Chair, Cramer teal-blue     3294
  269     Lab Chair, Cramer teal-blue     3295
  269     Lab Chair, Cramer teal-blue     3296
  269     Lab Chair, Cramer teal-blue     3297
  269     Lab Chair, Cramer teal-blue     3298
  269     Lab Chair, Cramer teal-blue     3299
  269     Lab Chair, Cramer teal-blue     3300
  269     Lab Chair, Cramer teal-blue     3301
  269     Lab Chair, Cramer teal-blue     3302
  269     Lab Chair, Cramer teal-blue     3303
  269     Lab Chair, Cramer teal-blue     3304
  269     Lab Chair, Cramer teal-blue     3305
  269     Lab Chair, Cramer teal-blue     3306
  269     Lab Chair, Cramer teal-blue     3307
  269     Lab Chair, Cramer teal-blue     3308
  269     Lab Chair, Cramer teal-blue     3309
  269     Lab Chair, Cramer teal-blue     3310
  269     Lab Chair, Cramer teal-blue     3311
  269     Lab Chair, Cramer teal-blue     3312
  269     Lab Chair, Cramer teal-blue     3313
  269     Lab Chair, Cramer teal-blue     3314
  269     Lab Chair, Cramer teal-blue     3315
  269     Lab Chair, Cramer teal-blue     3316
  269     Lab Chair, Cramer teal-blue     3317
  269     Lab Chair, Cramer teal-blue     3318
  269     Lab Chair, Cramer teal-blue     3319
  269     Lab Chair, Cramer teal-blue     3320
  269     Lab Chair, Cramer teal-blue     3321
  269     Lab Chair, Cramer teal-blue     3332
  269     Lab Chair, Cramer teal-blue       NT
  269     Refrigerator box, double door   3386
  269     Refrigerator box, double door   3387
  269     Refrigerator box, double door   3388
  269     Refrigerator box, double door   3389
  269     Refrigerator box, double door   3390
  269     Refrigerator box, double door   3391
  269     Refrigerator box, double door   5183
  269     Refrigerator box, double door   5184
  269     Refrigerator box, single door   5182
  270     Bench, c-frame                1 each


                                       C-2
<PAGE>

7/11/96             Office Furn. (by location)              Page 1


LOCATION            DESCRIPTION         MATRIX #            COMMENTS
  114     Desk chair                      5090
  114     Desk chair                      5091
  114     Desk chair                      5092
  114     Desk chair                      5093
  114     Storage cabinet                   NT
  114     Table, conference round         5095
  201     Desk chair                      5112
  201     Desk chair                      5118
  201     Desk chair                      5147
  201     File cabinet - 2 drawer         5152
  201     File cabinet - 2 drawer         5153
  201     Table worksurface               3410
  202     Desk chair                      5157
  202     Desk chair                      5051
  202     Desk chair                      5063
  202     File cabinet - 2 drawer         5158
  202     File cabinet - 2 drawer         5159
  202     Table worksurface               3334
  203     Desk chair                      3039
  203     Desk chair                      3487
  203     Desk chair                      3492
  203     File cabinet - 2 drawer         3495
  203     File cabinet - 2 drawer         3496
  205     Bookcase, 5 ft.                 3470
  205     Desk chair                      3471
  205     Desk chair                      3038
  205     Desk chair                      3473
  205     File cabinet - 2 drawer         3468
  205     File cabinet - 2 drawer         3469
  207     Desk chair                      3453
  207     Desk chair                      3474
  207     Desk chair                      3435
  207     File cabinet - 2 drawer         3477
  207     File cabinet - 2 drawer         3478
  208     Desk chair                      3488
  208     Desk chair                      3489
  208     Desk chair                      3486
  208     File cabinet - 2 drawer         3490
  208     File cabinet - 2 drawer         3491
  209     Desk chair                      3482
  209     Desk chair                      3480
  209     Desk chair                      3101
  209     File cabinet - 2 drawer         3481
  210     File cabinet - 2 drawer         3483
  213     Desk chair                      3427
  213     Desk worksurface                3423
  213     Desk worksurface                3424
  213     Desk worksurface                3425
  213     Desk worksurface                3426
  213     Side chair                      3070
  214     Boardroom chair                 5096
  214     Boardroom chair                 5097
  214     Boardroom chair                 5098
  214     Boardroom chair                 5099


                                       C-3
<PAGE>

7/11/96             Office Furn. (by location)              Page 2



LOCATION            DESCRIPTION         MATRIX #            COMMENTS
  214     Boardroom chair                 5100
  214     Boardroom chair                 5101
  214     Boardroom chair                 5102
  214     Boardroom chair                 5103
  214     Boardroom chair                 5104
  214     Boardroom chair                 5105
  214     Boardroom chair                 5106
  214     Boardroom chair                 5107
  214     Boardroom chair                 5108
  214     Boardroom chair                 5109
  214     Boardroom chair                 5110
  214     Boardroom chair                 5111
  214     Boardroom table                 5119
  214     Boardroom white board           5120
  219     Desk chair                      5144
  219     File cabinet - 2 drawer           NT
  219     File cabinet - 2 drawer           NT
  219     File cabinet - 2 drawer           NT
  219     Side chair                      3108
  220     Desk chair                      3047
  220     Desk chair                      3049
  220     Desk chair                      5141
  220     File cabinet - 2 drawer           NT
  220     File cabinet - 2 drawer           NT
  221     Desk chair                      3368
  221     Desk chair                      5142
  221     Desk chair                      3088
  221     File cabinet - 2 drawer           NT
  221     File cabinet - 2 drawer           NT
  222     Desk chair                      3048
  222     Desk chair                      5135
  222     Desk chair                      5125
  222     File cabinet - 2 drawer           NT
  222     File cabinet - 2 drawer           NT
  223     Desk chair                      3065
  223     Desk chair                      5123
  223     Desk chair                      3113
  223     File cabinet - 2 drawer         3444
  225     Desk chair                      3421
  225     File cabinet - 2 drawer         3419
  225     File cabinet - 4 drawer         3420
  225     Side chair                      3422
  226     Desk chair                      5162
  226     File cabinet - 2 drawer         5163
  226     File cabinet - 5 drawer           NT
  226     Side chair                      5160
  226     Side chair                      5161
  227     Desk chair                      3413
  227     File cabinet - 2 drawer         3112
  227     Side chair                      3114
  230     Desk chair                      3412
  230     Desk chair                      3414
  230     Desk chair                      3411
  230     File cabinet - 2 drawer         5077


                                       C-4
<PAGE>

7/11/96             Office Furn. (by location)              Page 3




LOCATION            DESCRIPTION         MATRIX #            COMMENTS
  230     File cabinet - 2 drawer         3031
  231     Desk chair                      3068
  231     Desk chair                      5122
  231     Desk chair                      3365
  231     File cabinet - 2 drawer         3406
  232     Desk chair                      3066
  232     File cabinet - 2 drawer         3401
  232     File cabinet - 2 drawer         3402
  232     File cabinet - 5 drawer         3403
  240     Desk chair                      3415
  240     Desk chair                      3416
  240     Desk chair                      3367
  240     File cabinet - 2 drawer         3417
  240     File cabinet - 2 drawer         3418
  241     Desk chair                        NT
  241     Desk chair                      3054
  241     Desk chair                        NT
  241     File cabinet - 2 drawer           NT
  241     File cabinet - 2 drawer           NT
  267     Storage cabinet                 3331
  267     Table, worksurface              3335
  267     Table, worksurface              3338
  276     Table, conference               3397
  287     Desk chair                      3236
  287     Desk chair                      3238
  287     Desk chair                      3374
  287     File cabinet - 2 drawer         3235
  288     Desk chair                      3228
  288     Desk chair                      3232
  288     Desk chair                      3373
  288     File cabinet - 2 drawer         3231
  289     Desk chair                      3333
  289     Desk chair                        NT
  289     Desk chair                      3227
  289     File cabinet - 2 drawer         3230
  290     Bookcase, library               3198
  290     Bookcase, library               3199
  290     Bookcase, library               3200
  290     Bookcase, library               3201
  290     Bookcase, library               3202
  290     Bookcase, library               3203
  290     Bookcase, library               3204
  290     Bookcase, library               3205
  290     Bookcase, library               3206
  290     Bookcase, library               3207
  290     Bookcase, library               3208
  290     Bookcase, library               3209
  290     Bookcase, library               3210
  290     Bookcase, library               3211
  290     Bookcase, library               3213
  290     Bookcase, library               3214
  290     Bookcase, library               3215
  290     Bookcase, library               3216
  290     Bookcase, library               3217


                                       C-5

<PAGE>

7/11/96             Office Furn. (by location)              Page 4



LOCATION            DESCRIPTION         MATRIX #            COMMENTS
  290     Bookcase, library               3218
  290     Bookcase, library               3219
  290     Bookcase, library               3220
  290     Bookcase, library               3221
  290     Bookcase, library               3222
  290     Bookcase, library               3223
  290     File cabinet, 2 drawer          3226
  290     Stacking chair, orange            NT
  290     Stacking chair, orange            NT
  290     Stacking chair, orange            NT
  290     Stacking chair, orange            NT
  290     Stacking chair, orange            NT
  290     Stacking chair, orange            NT
  290     Stacking chair, orange            NT
  290     Stacking chair, orange            NT
 206-c1   Desk chair                      3456
 206-c1   Desk chair                      3457
 206-c1   Desk chair                      3370
 206-c1   File cabinet - 2 drawer         3465
 206-c10  Desk chair                      3433
 206-c10  Desk chair                      3434
 206-c10  File cabinet - 2 drawer         3436
 206-c10  File cabinet - 2 drawer         3437
 206-c10  File cabinet - 2 drawer         3438
 206-c11  Desk chair                      3429
 206-c11  File cabinet - 2 drawer         3430
 206-c11  Side chair                      3431
 206-c2   Desk chair                      3369
 206-c2   Desk chair                      3454
 206-c2   Desk chair                      3472
 206-c2   File cabinet - 2 drawer         3464
 206-c3   Desk chair                      3451
 206-c3   Desk chair                      3452
 206-c3   Desk chair                      3371
 206-c3   File cabinet - 2 drawer         3463
 206-c4   Desk chair                      3458
 206-c4   File cabinet - 2 drawer         3462
 206-c4   File cabinet - 3 drawer         3449
 206-c4   Side chair                      3459
 206-c5   Desk chair                      3450
 206-c5   File cabinet - 2 drawer         3461
 206-c5   File cabinet - 3 drawer         3448
 206-c5   Side chair                      3460
 206-c6   Desk chair                      3445
 206-c6   File cabinet - 2 drawer         3443
 206-c6   File cabinet - 3 drawer         3447
 206-c6   Side chair                      3446
 206-c7   Desk chair                      3455
 206-c7   File cabinet - 2 drawer         3439
 206-c7   Side chair                        NT
 206-c8   Desk chair                      3476
 206-c8   File cabinet - 2 drawer         3440
 206-c8   Side chair                      3441
 206-c9   Desk chair                      3475


                                       C-6
<PAGE>

7/11/96             Office Furn. (by location)              Page 5



LOCATION            DESCRIPTION         MATRIX #            COMMENTS
 206-c9   File cabinet - 2 drawer         3442
 206-c9   Side chair                      5145
 218-c1   Desk chair                      3110
 218-c1   File cabinet - 2 drawer         3104
 218-c1   File cabinet - 2  drawer        3105
 218-c10  Desk chair                      5133
 218-c10  File cabinet - 2 drawer         3092
 218-c10  Side chair                      3093
 218-c11  Desk chair                      3080
 218-c11  File cabinet - 2 drawer         3074
 218-c11  Side chair                      3075
 218-c12  Desk chair                      3077
 218-c12  File cabinet - 2 drawer         3076
 218-c13  Desk chair                      5136
 218-c13  File cabinet - 2 drawer         3079
 218-c13  Side chair                      3081
 218-c14  Desk chair                      3083
 218-c14  File cabinet - 2 drawer         3082
 218-c14  Side chair                      3084
 218-c2   Desk chair                      3107
 218-c2   File cabinet - 2 drawer         3109
 218-c2   Side chair                      3111
 218-c3   Desk chair                      5126
 218-c3   File cabinet - 4 drawer         3097
 218-c3   File cabinet - 4 drawer         3098
 218-c4   Desk chair                      5131
 218-c4   File cabinet - 4 drawer         3095
 218-c4   File cabinet - 4 drawer         3096
 218-c4   File cabinet - 4 drawer         3100
 218-c5   Desk chair                        NT
 218-c5   File cabinet - 2 drawer         3466
 218-c5   File cabinet - 2 drawer         3467
 218-c6   Desk chair                      5127
 218-c6   File cabinet - 2 drawer         3102
 218-c6   Side chair                      3103
 218-c7   Desk chair                      3094
 218-c7   File cabinet - 2 drawer         3085
 218-c7   File cabinet - 2 drawer         3086
 218-c8   Desk chair                      3099
 218-c8   File cabinet - 2 drawer         3087
 218-c8   Side chair                      3089
 218-c9   Desk chair                      3428
 218-c9   File cabinet - 2 drawer         3090
 218-c9   Side chair                      3091
 242-c1   Desk chair                      3363
 242-c1   File cabinet - 2 drawer         3404
 242-c1   File cabinet - 2 drawer         3405
 242-c2   Desk chair                      3361
 242-c2   File cabinet - 2 drawer         3400
 242-c2   Side chair                      3378
 242-c3   Desk chair                      3366
 242-c3   File cabinet - 2 drawer           NT
 242-c3   File cabinet - 4 drawer         3395
 242-c3   Side chair                      3071


                                       C-7
<PAGE>

7/11/96             Office Furn. (by location)              Page 6



LOCATION            DESCRIPTION         MATRIX #            COMMENTS
 242-c4   Desk chair                      3362
 242-c4   File cabinet - 2 drawer         3239
 242-c4   Side chair                      3069
 242-c5   Desk chair                      3360
 242-c5   File cabinet - 2 drawer         3399
 242-c5   Side chair                      3376
 242-c6   Desk chair                      3364
 242-c6   File cabinet - 2 drawer         3407
 242-c6   Side chair                      3377
 256-c1   Desk chair                      3242
 256-c1   File cabinet - 2 drawer         3248
 256-c1   Side chair                      3246
 256-c2   Desk chair                      3243
 256-c2   File cabinet - 2 drawer         3253
 256-c2   Side chair                      3247
 256-c3   Desk chair                      3241
 256-c3   Desk chair                      5167
 256-c3   File cabinet - 2 drawer         3249
 256-c3   File cabinet - 2 drawer         3250
 256-c4   Desk chair                      3244
 256-c4   Desk chair                      3245
 256-c4   File cabinet - 2 drawer         3251
 256-c4   File cabinet - 2 drawer         3252
 268-c1   Desk chair                      3340
 268-c1   File cabinet - 2 drawer         3339
 268-c1   Side chair                      3341
 268-c2   Desk chair                      3342
 268-c2   File cabinet - 2 drawer         3344
 268-c2   Side chair                      3343
 268-c3   Desk chair                      3346
 268-c3   File cabinet - 2 drawer         3353
 268-c3   Side chair                      3358
 268-c4   Desk chair                      3345
 268-c4   File cabinet - 2 drawer         3352
 268-c4   Side chair                      3357
 268-c5   Desk chair                      3348
 268-c5   Desk chair                      3350
 268-c5   File cabinet - 2 drawer         3336
 268-c5   File cabinet - 2 drawer         3354
 268-c6   Desk chair                      3349
 268-c6   Desk chair                      3351
 268-c6   File cabinet - 2 drawer         3355
 268-c6   File cabinet - 2 drawer         3356
 273-c1   Desk chair                      5200
 273-c1   Desk chair                      5201
 273-c1   File cabinet - 2 drawer         5198
 273-c1   File cabinet - 2 drawer         5199
 273-c2   Desk chair                      3479
 273-c2   Desk chair                      5196
 273-c2   File cabinet - 2 drawer         5194
 273-c2   File cabinet - 2 drawer         5195
 273-c3   Desk chair                      5189
 273-c3   File cabinet - 2 drawer         5188
 273-c3   Side chair                      3150


                                       C-8
<PAGE>

7/11/96             Office Furn. (by location)              Page 7



LOCATION            DESCRIPTION         MATRIX #            COMMENTS
 273-c4   Desk chair                      5192
 273-c4   File cabinet - 2 drawer         5191
 273-c4   Side chair                      5193
 273-c5   Desk chair                      3147
 273-c5   File cabinet - 2 drawer         5202
 273-c5   Side chair                      3375
 273-c6   Desk chair                      5205
 273-c6   File cabinet - 2 drawer         5203
 273-c6   Side chair                      5207
 283-c1   Desk chair                        NT
 283-c1   File cabinet - 2 drawer         3240
 283-c1   File cabinet - 2 drawer         5213
 283-c2   Desk chair                      3432
 283-c2   Desk chair                      3347
 283-c2   File cabinet - 2 drawer         5214
 283-c2   File cabinet - 2 drawer           NT
 283-c3   Desk chair                      3237
 283-c3   Desk chair                      5212
 283-c3   File cabinet - 2 drawer         5208
 283-c3   File cabinet - 2 drawer         5209
 283-c4   Desk chair                      3050
 283-c4   Desk chair                        NT
 283-c4   File cabinet - 2 drawer         5210
 283-c4   File cabinet - 2 drawer         5211
 286-c1   Desk chair                      3372
 286-c1   Desk chair                      3229
 286-c1   Desk chair                      3183
 286-c1   File cabinet - 2 drawer         3182
 286-c2   Desk chair                      3224
 286-c2   Desk chair                      3185
 286-c2   Desk chair                      3187
 286-c2   File cabinet - 2 drawer         3188
 286-c2   File cabinet - 2 drawer         3189
 286-c3   Desk chair                      3179
 286-c3   File cabinet - 2 drawer         3181
 286-c3   Side chair                      3180
 286-c4   Desk chair                      3184
 286-c4   File cabinet - 2 drawer         3178
 286-c4   Side chair                      3177
 286-c5   Desk chair                      3173
 286-c5   File cabinet - 2 drawer         3171
 286-c5   Side chair                      3172
 286-c6   Desk chair                      3175
 286-c6   File cabinet - 2 drawer         3174
 286-c6   Side chair                      3176


Verified by:  Peter Hammar, Advanced Tissue Sciences
                    /s/  PH     2/15/95

              John Richardson, Matrix Pharmaceutical Inc.
                    /s/  John Richardson     2/15/96


                                       C-9
<PAGE>


                                   EXHIBIT "D"


                     LANDLORD-APPROVED HAZARDOUS SUBSTANCES


[17 ILLEGIBLE FORMS SETTING FORTH INFORMATION ON THE FOLLOWING:

                                                             Page
BENZO[A]PYRENE                                               D-1
CYCLOPHOSPHAMIDE                                             D-2
FORMALDEHYDE                                                 D-3
ACRYLAMIDE                                                   D-4
DIGOXIN                                                      D-5
LINDANE                                                      D-6
PARAQUAT                                                     D-7
SODIUM AZIDE                                                 D-8
THALLOUS SULFATE                                             D-9
BENZO[A]PYRENE                                               D-10
CARBON TETRACHLORIDE                                         D-11
CROCEIN SCARLET                                              D-12
DIPHENYL HYDANTOIN                                           D-13
ISONICOTINIC ACID HYDRAZIDE                                  D-14
DIMETHYL ARSENIC ACID                                        D-15
CARBON DIOXIDE                                               D-16
OXYGEN                                                       D-17



<PAGE>

Tenant uses various human and animal  tissues in its research to be conducted on
the  Premises.  Such  tissus are  subject to  Tenant's  SOPs and all  Applicable
Requirements.

Tenant shall bring tissue into the building in accordance with procedures agreed
upon between Landlord and Tenant.


                                      D-18

<PAGE>

                                   EXHIBIT "E"


                             LANDLORD'S ALTERATIONS




<PAGE>


[HAND-DRAWN  MAP OF OFFICE  AND LAB  LOCATIONS  SHOWING  ALTERATIONS,  INCLUDING
EXISTING FLOOR CRACKS.]

<PAGE>


[HAND-DRAWN  MAP OF OFFICE  AND LAB  LOCATIONS  SHOWING  ALTERATIONS,  INCLUDING
NOTATION:  *EXISTING  LAB BENCH AND SINK AND RELATED  PLUMBING  TO BE  RELOCATED
APPROX. 12 FEET AWAY AT LANDLORD'S SOLE COST AND EXPENSE.]




<PAGE>


                                   EXHIBIT "F"

                        ENTRANCE/EXIT ASSESSMENT CRITERIA


For purposes of compliance with the requirements of Sections 7 and 8 of Addendum
"A" to the Lease,  the term  "Assessment  Criteria" with respect to the Premises
and hazardous  radioactive  storage units utilized by Tenant shall refer to, and
include, the following studies and assessments:

     A. The following assessments and inspections:

       1.      Interior Site Assessment consisting of a visual inspection of all
               surfaces  (floors,  walls,  ceiling tiles,  benches,  interior of
               cabinets  and  fume  hoods)  for  signs  of   contamination   and
               deterioration.  Visual inspection of all bench and hood sinks and
               readily  accessible drain lines for signs of deterioration,  loss
               of integrity  and leakage.  The Interior  Site  Assessment  shall
               include  detailed  written  documentation of all observations and
               dated photos to document the existing condition thereof.

       2.      Wastewater Collection System Assessment consisting of a flush and
               clean-out of all discharge  piping and traps with  observation of
               effluent during the clean-out.

       3.      In  order  to  verify  that  there  is no  contamination  of  the
               laboratory hoods and exhaust system,  an inspection shall be made
               consisting of an inspection of the  laboratory  hoods and exhaust
               system with detailed documentation of all observances,  including
               without limitation,  observed solids, liquids, odors or Hazardous
               Materials entrapment. Such inspection shall include inspection of
               the roof area to determine  the  existence  of any  deterioration
               from condensation of hazardous materials in the exhaust system.

     B.   The  Assessment  Criteria shall also include such sampling and testing
          as  the  consultant  reasonably  recommends  based  upon  his  or  her
          observations.



<TABLE> <S> <C>


<ARTICLE>                     5
<CIK>                         0000882194
<NAME>                        Matrix Pharmaceutical, Inc.
<MULTIPLIER>                  1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                              DEC-31-1996
<PERIOD-START>                                 APR-01-1996
<PERIOD-END>                                   JUN-30-1996
<CASH>                                          25,843
<SECURITIES>                                   103,536
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                56,601
<PP&E>                                          20,656
<DEPRECIATION>                                   3,901
<TOTAL-ASSETS>                                 147,510
<CURRENT-LIABILITIES>                            4,797
<BONDS>                                              0
<COMMON>                                       222,018
                                0
                                          0
<OTHER-SE>                                        (904)
<TOTAL-LIABILITY-AND-EQUITY>                   147,510
<SALES>                                              0
<TOTAL-REVENUES>                                     0
<CGS>                                                0
<TOTAL-COSTS>                                   16,308
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 547
<INCOME-PRETAX>                                (14,284)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            (16,308)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (14,284)
<EPS-PRIMARY>                                    (0.76)
<EPS-DILUTED>                                     0.00
        


</TABLE>


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