LYNX THERAPEUTICS INC
S-3, 1997-10-31
MEDICINAL CHEMICALS & BOTANICAL PRODUCTS
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    As filed with the Securities and Exchange Commission on October 31, 1997
                                                           Registration No. 333-
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   -----------

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

                                   -----------

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

           Delaware                                   94-3161073
(State or other jurisdiction of          (I.R.S. Employer Identification Number)
incorporation or organization)

                                   -----------

                              3832 Bay Center Place
                            Hayward, California 94545
                                 (510) 670-9300
    (Address, including zip code, and telephone number, including area code,
                  of registrant's principal executive offices)

                                   -----------

                                Edward C. Albini
                             Chief Financial Officer
                             Lynx Therapeutics, Inc.
                              3832 Bay Center Place
                            Hayward, California 94545
                                 (510) 670-9300
                               Fax: (510) 670-9302
            (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

                                   -----------

                                   Copies to:
                              James C. Kitch, Esq.
                               COOLEY GODWARD LLP
                              Five Palo Alto Square
                               3000 El Camino Real
                        Palo Alto, California 94306-2155
                                 (650) 843-5000
                               Fax (650) 857-0663

                                   -----------

                  Approximate date of commencement of proposed
              sale to the public: As soon as practicable after the
                 effective date of this Registration Statement.
                                   -----------
If the only securities  being registered on this Form are being offered pursuant
to dividend or interest reinvestment plans, please check the following box. [ ]

If any of the  securities  being  registered on this Form are to be offered on a
delayed or continuous  basis  pursuant to Rule 415 under the  Securities  Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [X]

If this form is filed to register additional securities for an offering pursuant
to Rule 462(b) under the Securities Act, please check the following box and list
the  Securities  Act  registration  statement  number of the  earlier  effective
registration statement for the same offering. [ ]

If this form is a  post-effective  amendment filed pursuant to Rule 462(c) under
the  Securities  Act,  check  the  following  box and  list the  Securities  Act
registration  statement number of the earlier effective  registration  statement
for the same offering. [ ]

If delivery  of the  prospectus  is  expected  to be made  pursuant to Rule 434,
please check the following box. [ ]

<TABLE>
                                                   CALCULATION OF REGISTRATION FEE
<CAPTION>
====================================================================================================================================
                                                                                          Proposed Maximum
     Title of Class of              Amount to be        Proposed Maximum Offering        Aggregate Offering           Amount of
Securities to be Registered        Registered (1)          Price Per Share (2)               Price (2)            Registration Fee
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                              <C>                        <C>                              <C>                      <C> 
Common Stock, $0.01 par
value per share                  2,675,500 shares           $14.00                           $37,457,000              $11,351
====================================================================================================================================
<FN>
(1)  All  2,675,500  shares of Common Stock  offered  hereby are being  offered and sold by the Selling  Stockholders.  See "Selling
     Stockholders."

(2)  The price of $14.00  per  share,  which  was the  average  of the high and low  prices  of the  Common  Stock  reported  on the
     Over-the-Counter ("OTC") market on October 27, 1997, is set forth solely for the purpose of calculating the registration fee in
     accordance with Rule 457(c) of the Securities Act of 1933, as amended.
</FN>
</TABLE>
                                   -----------

     The Registrant  hereby amends this  Registration  Statement on such date or
dates as may be necessary to delay its effective date until the Registrant shall
file a  further  amendment  that  specifically  states  that  this  Registration
Statement shall  thereafter  become effective in accordance with Section 8(a) of
the  Securities  Act of 1933 or until the  Registration  Statement  shall become
effective on such date as the Commission,  acting pursuant to said Section 8(a),
may determine.

<PAGE>

INFORMATION   CONTAINED  HEREIN  IS  SUBJECT  TO  COMPLETION  OR  AMENDMENT.   A
REGISTRATION  STATEMENT  RELATING  TO THESE  SECURITIES  HAS BEEN FILED WITH THE
SECURITIES  AND EXCHANGE  COMMISSION.  THESE  SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION  STATEMENT  BECOMES
EFFECTIVE.  THIS  PROSPECTUS  SHALL  NOT  CONSTITUTE  AN  OFFER  TO  SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE  SECURITIES
IN ANY STATE IN WHICH SUCH OFFER,  SOLICITATION  OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.


                  SUBJECT TO COMPLETION, DATED OCTOBER 31, 1997

PROSPECTUS


                                2,675,500 Shares


                             LYNX THERAPEUTICS, INC.


                                  Common Stock

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

         All of the shares of Common Stock,  par value $0.01 per share,  of Lynx
Therapeutics,  Inc. ("Lynx" or the "Company")  offered hereby (the "Shares") are
being  offered  and  sold  by  certain  persons  listed  herein  under  "Selling
Stockholders"  (collectively,  the  "Selling  Stockholders").  The  Shares  were
purchased by the Selling Stockholders from the Company in a private placement in
1997.  All of the Shares are being offered  hereby by the Selling  Stockholders,
and the Company will not receive any of the proceeds from the sale of the Shares
by the Selling  Stockholders.  The Company's Common Stock is currently traded on
the  over-the-counter  ("OTC")  market.  The last  reported  sales  price of the
Company's  Common  Stock on the OTC  market on October  30,  1997 was $14.50 per
share.

         The Selling Stockholders, directly or through agents, broker-dealers or
underwriters,  may sell the Shares  offered hereby from time to time on terms to
be determined at the time of sale, in transactions on the Nasdaq National Market
or in privately negotiated transactions. The Selling Stockholder and any agents,
broker-dealers  or  underwriters  that  participate in the  distribution  of the
Common  Stock may be deemed  to be  "underwriters"  within  the  meaning  of the
Securities Act of 1933, as amended (the  "Securities  Act"),  and any commission
received by them and any profit on the resale of the Common  Stock  purchased by
them may be  deemed  to be  underwriting  discounts  or  commissions  under  the
Securities Act. See "Selling Stockholders" and "Plan of Distribution."

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

       THE COMMON STOCK OFFERED HEREBY INVOLVES A HIGH DEGREE OF RISK. SEE
                   "RISK FACTORS" COMMENCING ON PAGE 3 HEREOF.

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

    THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
     AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
      SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
          PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
              REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

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

         No underwriting commissions or discounts will be paid by the Company in
connection  with this  offering.  Estimated  expenses  payable by the Company in
connection with this offering are $60,000. The aggregate proceeds to the Selling
Stockholders  from  the sale of the  Shares  will be the  purchase  price of the
Shares sold less the aggregate agents' commissions and underwriters'  discounts,
if any,  and  other  expenses  of  issuance  and  distribution  not borne by the
Company. See "Plan of Distribution."

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

                 The date of this Prospectus is October , 1997.

<PAGE>

                              AVAILABLE INFORMATION

         The Company is subject to the information reporting requirements of the
Securities  Exchange  Act of 1934,  as  amended  (the  "Exchange  Act"),  and in
accordance  therewith file reports,  proxy statements and other information with
the  Securities  and  Exchange  Commission  (the  "SEC").  Such  reports,  proxy
statements  and other  information  may be  inspected  and  copied at the public
reference  facilities  maintained by the SEC at Room 1024,  Judiciary Plaza, 450
Fifth Street,  N.W.,  Washington,  D.C. 20549, and at the SEC's regional offices
located at Seven World Trade Center,  Suite 1300, New York, New York 10048,  and
at Citicorp  Center,  500 West Madison  Street,  Suite 1400,  Chicago,  Illinois
60661-2511.  Copies of such  material  may be  obtained  by mail from the Public
Reference  Section  of the SEC at  Judiciary  Plaza,  450  Fifth  Street,  N.W.,
Washington,  D.C. 20549, at prescribed  rates. The SEC also maintains a Web site
that contains  reports,  proxy and information  statements and other information
regarding  registrants  that  file  electronically  with the SEC at the  address
http://www.sec.gov.   The  Company's   reports,   proxy   statements  and  other
information  can also be inspected and copied at the offices of The Nasdaq Stock
Market, 1735 K Street, N.W., Washington DC 20006.

         The Company has filed with the SEC a registration statement on Form S-3
(herein  referred  to,  together  with  all  amendments  and  exhibits,  as  the
"Registration  Statement")  under the  Securities  Act of 1933,  as amended (the
"Securities  Act").  This Prospectus does not contain all of the information set
forth in the  Registration  Statement,  certain  parts of which are  omitted  in
accordance with the rules and  regulations of the SEC. For further  information,
reference  is  hereby  made  to  the  Registration  Statement.   Copies  of  the
Registration Statement and the exhibits and schedules are available as described
above.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

         The following documents, filed or to be filed with the Commission under
the Exchange Act are hereby incorporated by reference into this Prospectus:

         (a) The Company's  Annual Report on Form 10-K for the fiscal year ended
December 31, 1996;

         (b) The Company's  Quarterly Reports on Form 10-Q, as amended,  for the
quarterly periods ended March 31, and June 30, 1997; and

         (c) The  description  of the Common Stock  contained  in the  Company's
Registration Statement on Form 10 (No. 0-22570), as amended,  initially filed on
October 5, 1993.

         All documents filed by the Company  pursuant to Sections 13(a),  13(c),
14 or 15(d) of the Exchange Act after the date of this  Prospectus  and prior to
the  termination of the offering shall be deemed to be incorporated by reference
herein and to be a part  hereof from the date of filing of such  documents.  Any
statement  contained in this Prospectus or in a document  incorporated or deemed
to be  incorporated  by  reference  herein  shall be  deemed to be  modified  or
superseded  for  purposes  of this  Prospectus  to the extent  that a  statement
contained  herein  or in any  subsequently-filed  document  which  also is or is
deemed to be  incorporated  by  reference  herein  modifies or  supersedes  such
statement.  Any such  statement so modified or  superseded  shall not be deemed,
except as so modified or superseded, to constitute a part of this Prospectus.

         The Company will provide  without charge to each person,  including any
beneficial  owner,  to whom this  Prospectus is delivered,  upon written or oral
request of such person,  a copy of any and all of the  documents  that have been
incorporated  by  reference  herein (not  including  exhibits to such  documents
unless such exhibits are  specifically  incorporated by reference herein or into
such  documents).  Such  request  may be directed  to Lynx  Therapeutics,  Inc.,
Attention:  Chief Financial Officer, 3832 Bay Center Place, Hayward,  California
94545, telephone (510) 670-9300.

                           FORWARD LOOKING STATEMENTS

         This Prospectus contains forward-looking  statements within the meaning
of Section 27A of the  Securities  Act and Section 21E of the Exchange Act which
are subject to the "safe harbor"  created by those  sections.  When used in this
Prospectus,  the words  "anticipate,"  "believe,"  "estimate,"  and "expect" and
similar expressions as they relate to the Company or its management are intended
to identify  such  forward-looking  statements.  The Company's  actual  results,
performance,  or achievements could differ materially from the results expressed
in, or  implied  by,  these  forward-looking  statements  as a result of certain
factors,  including  those set forth in "Risk  Factors"  and  elsewhere  in this
Prospectus.

                                        2

<PAGE>

                                   THE COMPANY

         Lynx Therapeutics, Inc. (the "Company") was incorporated in Delaware in
February  1992. The Company's  executive  offices are located at 3832 Bay Center
Place, Hayward, California 94545, and its telephone number is (510) 670-9300.

                                  RISK FACTORS

         This Prospectus contains forward-looking  statements that involve risks
and  uncertainties.  Actual results could differ materially from those discussed
in the  forward-looking  statements  as a result of certain  factors,  including
those set forth below and  elsewhere  in this  Prospectus.  The  following  risk
factors should be considered  carefully in addition to the other  information in
this Prospectus before purchasing the shares of Common Stock offered hereby.

Unproven Business Strategy; Uncertainty of Product Success or Market Acceptance

         The  Company's  strategy  of using  its  massively  parallel  signature
sequencing   technologies  for  gene  sequencing  for  the  purpose  of  rapidly
identifying  genes,  defining and  characterizing  gene  function,  and enabling
high-resolution genomic mapping is unproven.  While certain other companies have
similar technology or have adopted a similar strategy,  the application of these
technologies and strategies is in too early a stage to determine  whether it can
be successfully implemented.

         The Company's genomic database subscription business and the use of its
products  to  assist in and  improve  the  efficiency  of the  traditional  drug
discovery  process  is in too  early  a stage  to  determine  whether  it can be
successful.  There can be no assurance that companies will accept the usefulness
of the Company's  products and related  services.  In addition,  the Company has
limited  experience in providing  software-based  database products or services.
The Company's ability to achieve  profitability  depends on attracting customers
for its  database  and  sequencing  products  and  services.  The  nature of the
Company's products and services are such that there is a limited number of large
pharmaceutical  companies  that are  potential  customers  for such products and
services,  two of which have signed  agreements with the Company to date.  There
can be no assurance that any of the Company's product  development  efforts will
be  successfully  completed  or that the  Company's  products  will gain  market
acceptance.

Early Stage of Development; Technological Uncertainty

         Lynx is at an early stage of development and must be evaluated in light
of the uncertainties and complications  present in an early stage  biotechnology
company. All of Lynx's products and services are in research or development, and
have not generated  significant  revenues.  To date, most of Lynx's efforts have
been dedicated to the development of its original  oligodeoxynucleotide  ("ODN")
chemistry technology and recently developed  technologies for massively parallel
signature sequencing of cloned cDNA. The massively parallel signature sequencing
program  is in the  development  stage  and is  dependent  upon  the  successful
integration of independent  technologies,  each of which has its own development
risks.  There can be no assurance that these  technologies  will be successfully
developed  or, if they are,  that they can be  integrated  successfully.  Lynx's
research in molecular biology and medicinal  chemistry and its assessment of the
potential  pharmaceutical  effectiveness  of ODN compounds  have, to date,  been
entirely  dependent on collaborative  efforts.  While Lynx and its collaborators
have demonstrated that some of Lynx's antisense compounds are active in cellular
in vitro  systems and in animal  models,  there can be no  assurance  that these
results  are  indicative  of results  that will be  obtained  in human  clinical
testing.  Pharmaceutical or biotechnology based products, if any, resulting from
Lynx's  research and  development  programs are not expected to be  commercially
available  for a number of years  even if they are  successfully  developed  and
proven to be safe and effective.

Competition

         There  are a  finite  number  of genes in the  human  genome.  The race
amongst competitors in the genomics field is not just to identify these genes by
their sequences, but also to determine gene function, particularly gene function
in disease. Even when all genes are known, and their sequences  determined,  the
hunt for  functional  information  in the wide  variety of diseases  and disease
conditions will continue,  and characterization of genes (by their sequences) in
various samples will still be needed.  While Lynx believes that it contributes a
uniquely  efficient gene analysis  technique to that hunt,  other companies have
substantially   greater  research  and  product  development   capabilities  and
financial, scientific, and marketing resources than the Company.

                                        3

<PAGE>

         In its gene  analysis  programs,  Lynx will be  competing in some sense
with both  purveyors and users of current DNA analysis  technology.  Competition
from   fully   integrated   pharmaceutical   companies   and  more   established
biotechnology  companies  also is intense and is expected to increase.  Academic
institutions,  governmental  agencies  and other  public  and  private  research
organizations  also  conduct  research,  seek patent  protection  and  establish
collaborative arrangements for products and data access. While Lynx at this time
is not aware of a technology  that is  equivalent  or superior to its  massively
parallel  signature  sequencing,  there are other companies that provide data or
access to data  similar  to that which  Lynx  intends to offer.  There can be no
assurance that research and development efforts by others will not render any of
the Company's potential products and services noncompetitive.

Patents and Proprietary Rights

         Lynx's  success  will depend on its  ability to obtain  patents for its
technologies and products, maintain trade secrets and operate without infringing
on the  proprietary  rights of others,  both in the  United  States and in other
countries.  Patent  matters in  biotechnology  are highly  uncertain and involve
complex  legal and  factual  questions.  Accordingly,  the  availability  of and
breadth of claims allowed in biotechnology and pharmaceutical  patents cannot be
predicted.   Lynx  has  filed  and  will  continue  to  file  applications,   as
appropriate,  for patents  covering  both its  products  and  processes  and has
licensed a number of patents  and patent  applications  covering  certain of its
technologies,  processes and  compounds.  No assurance can be given that patents
will issue from any of the pending  applications  or that,  if patents do issue,
the claims allowed will be sufficiently broad to protect Lynx's  technology.  In
addition,  no assurance  can be given that any patents  issued to or licensed by
Lynx will not be challenged,  invalidated, infringed or circumvented or that the
rights  granted  thereunder  will  provide   competitive   advantages  to  Lynx.
Competitors  may have been issued  patents,  may have filed  applications or may
obtain  additional  patents  and  proprietary  rights  relating  to  products or
processes  competitive  with  those of the  Company  or which  could  block  the
Company's efforts to obtain patents.

         The  commercial  success  of Lynx will also  depend in part on Lynx not
infringing  patents  issued to  competitors  and on  others  not  breaching  the
technology  licenses upon which Lynx's products might be based.  There can be no
assurance  that  Lynx  will be able to  obtain  a  license  to any  third  party
technology  that it may require to conduct its business or that, if  obtainable,
such technology can be licensed at a reasonable cost.  Failure by Lynx to obtain
a  license  to  any  technology  that  it  may  require  to  commercialize   its
technologies or products may have a material adverse effect on Lynx.

         Litigation,  which could result in substantial  costs to Lynx, may also
be necessary  to enforce any patents  issued or licensed to Lynx or to determine
the  scope and  validity  of third  party  proprietary  rights.  There can be no
assurance  that the Company's  issued  patents would be held valid by a court of
competent jurisdiction. Even if the outcome of such litigation is favorable, the
cost of such litigation and the diversion of the Company's resources during such
litigation  could  have a material  adverse  effect on the  Company.  An adverse
outcome could subject the Company to  significant  liabilities to third parties,
require disputed rights to be licensed from third parties or require the Company
to cease  using such  technology,  any of which  could  have a material  adverse
effect on the Company.  If  competitors  of the Company  prepare and file patent
applications  in the United  States that claim  technology  also  claimed by the
Company,  the  Company  may  have to  participate  in  interference  proceedings
declared by the Patent and Trademark Office to determine  priority of invention,
which could  result in  substantial  cost to the  Company,  even if the eventual
outcome is favorable to Lynx.

         Lynx also relies on trade secrets and  proprietary  know-how,  which it
seeks to protect in part by  confidentiality  agreements with its collaborators,
employees and consultants.  There can be no assurance that these agreements will
not be breached,  that Lynx would have adequate  remedies for any breach or that
its trade secrets will not otherwise become known or be independently  developed
by  competitors.  To the extent that the Company or its  consultants or research
collaborators  use  intellectual  property owned by others in their work for the
Company,  disputes  may also  arise as to the  rights in  related  or  resulting
know-how and inventions.

Need to Establish Collaborative Relationships; Dependence on Partners

         Lynx's   business   strategy   includes   entering  into   subscription
arrangements,  strategic  alliances or  licensing  arrangements  with  corporate
partners, primarily pharmaceutical and biotechnology companies,  relating to the
development and commercialization of certain of its potential technologies, data
bases and products. There can be

                                        4

<PAGE>

no  assurance  that  Lynx  will be able to  negotiate  attractive  collaborative
arrangements or that such collaborations will be available to Lynx on acceptable
terms so that any such relationships,  once established,  will be scientifically
or commercially successful.  Lynx currently has two corporate agreements for its
massively parallel signature sequencing technology,  with Hoechst AG and Hoechst
Marion Roussel (collectively  referred to as "Hoechst") and BASF AG ("BASF"). In
exchange for access to the  technology  and for a specified  number of massively
parallel signature sequencing analyses per year, Lynx has received signing fees,
and  may  receive  milestone  payments  (upon  demonstration  by Lynx  that  the
technology  can  substantially   reproduce  data  obtained  by  other  means  in
well-studied  systems) and subscription  fees.  Additionally,  under the Hoechst
agreement,  Lynx  received  an initial  equity  investment  and will  receive an
additional equity investment, subject to achievement of a milestone.

         There can be no  assurance  that  Hoechst  or BASF or any other  future
collaborator  will not pursue  their  existing or  alternative  technologies  in
preference  to  those  being  developed  in  collaboration   with  the  Company.
Furthermore,  there  can be no  assurance  that  the  Company  will  be  able to
negotiate additional collaborative  arrangements on acceptable terms, if at all,
or that such collaborations  will be successful.  To the extent that the Company
chooses not to or is unable to establish  such  arrangements,  it would  require
substantially  greater capital to undertake  research and development of certain
of its potential technologies, data bases and products at its own expense.

         Lynx will be dependent on  collaborative  arrangements  relating to the
development  of LR 3280 for the  treatment  of  restenosis  and other  potential
antisense  compounds.  Although LR 3280 is in Phase II clinical trials in Europe
for the prevention of restenosis following balloon angioplasty and is the object
of  development  and   commercialization   agreements  with  two  pharmaceutical
companies,  there can be no assurance  that the Company's  clinical  trials will
demonstrate  sufficient  safety and efficacy  necessary to obtain the  requisite
regulatory  approvals  or will result in  marketable  products.  While Lynx will
depend on partners for funding and development  expertise in connection with the
Company's antisense  research,  the amount and timing of resources to be devoted
to these  activities  by such  corporate  partners,  if any,  are not within the
control of the Company. In addition,  there can be no assurance that the Company
will be able to negotiate such  collaborative  arrangements on acceptable terms,
if at all, or that such collaborations will be successful.

Absence of Sales and Marketing Experience

         Lynx has no  experience  in the sales,  marketing  or  distribution  of
pharmaceutical  products or services.  To market the products or services of its
massively  parallel  signature  sequencing  technologies,  Lynx must  define the
particular  products  and  services  that it will offer and  develop a sales and
marketing group with the appropriate technical expertise.  Lynx does not plan to
market  any of its  future  pharmaceutical  products  directly.  There can be no
assurance  that Lynx will be able to build such a sales force or that its direct
sales and marketing efforts will be successful.

History of Operating Losses

         The Company has a limited  history of  operations  and has  experienced
significant  operating  losses since its  inception in 1992.  The Company had an
accumulated  deficit of approximately  $39.0 million through September 30, 1997.
To achieve and sustain profitable operations, the Company, alone or with others,
must  develop   successfully,   obtain  regulatory  approval  for,  manufacture,
introduce,  market and sell its  products.  The time frame  necessary to achieve
market  success is  uncertain.  There can be no assurance  that the Company will
ever generate  sufficient  product  revenues to become  profitable or to sustain
profitability.

Use of Hazardous Materials

         Lynx's  research  and  development  may involve the  controlled  use of
hazardous  materials,  chemicals,  viruses  and various  radioactive  compounds.
Although Lynx believes that its safety  procedures for handling and disposing of
such materials will comply with the standards  prescribed by state,  federal and
local  regulations,  the risk of accidental  contamination  or injury from these
materials  cannot be  completely  eliminated.  In the event of such an accident,
Lynx could be held liable for any damages  that result,  and any such  liability
could exceed the resources of Lynx.

                                       5
<PAGE>

Dependence Upon Key Personnel

         Lynx is highly dependent on the principal members of its management and
scientific  staff,  the  loss of whose  services  could  significantly  delay or
prevent the achievement of research,  development and business objectives,  thus
having a material adverse effect on Lynx. Furthermore,  recruiting and retaining
qualified  scientific  personnel to perform research and development work in the
future will be critical to Lynx's  success.  Although  Lynx  believes it will be
successful  in  attracting  and  retaining  skilled and  experienced  scientific
personnel,  there can be no  assurance  that Lynx  will be able to  attract  and
retain such personnel on acceptable terms,  given the competition among numerous
pharmaceutical and health care companies,  universities and non-profit  research
institutions  for  experienced  scientists.  The  Company  is  dependent  on its
Chairman  and Chief  Executive  Officer,  Sam  Eletr,  Ph.D.,  the loss of whose
services would have a material  adverse  effect on the Company.  The Company has
recently  applied for key-man life  insurance on Dr. Eletr.  The Company has not
entered into an employment agreement with him.

Potential Volatility of Stock Price; Limited Market for Stock

         The Common  Stock is  currently  traded on the OTC market.  The Company
anticipates  qualifying its Common Stock to trade on the Nasdaq  National Market
("Nasdaq") by the end of 1997.  There can be no assurance  that the Common Stock
will be listed on Nasdaq or that a  sufficient  trading  market will  develop at
that time. In addition, should the Common Stock be traded on the Nasdaq National
Market,  the securities  markets have from time to time experienced  significant
price and volume fluctuations that may be unrelated to the operating performance
of particular companies.  The market prices of the common stock of many publicly
held, early stage biotechnology  companies have in the past been, and can in the
future be expected to be, especially  volatile.  Factors such as fluctuations in
the Company's operating results,  announcements of technological  innovations or
new commercial products by the Company or its competitors, release of reports by
securities  analysts,  developments or disputes concerning patent or proprietary
rights,  developments  in the  Company's  relationships  with  current or future
collaborative  partners,  if any,  and  general  market  conditions  may  have a
significant and adverse impact on the market price of the Common Stock.

Control by Officers, Directors and Principal Stockholders

         As of September 30, 1997,  directors,  executive officers and principal
stockholders  of the Company  will  beneficially  own  approximately  31% of the
outstanding   shares  of  the  Company's  capital  stock.   Accordingly,   these
stockholders,  individually  and as a group,  may be able to control the Company
and direct its affairs and business, including any determination with respect to
a change in control of the  Company,  future  issuances of Common Stock or other
securities by the Company,  declaration of dividends on the Common Stock and the
election of directors.


Shares Eligible for Future Sale

         On March 31, 1998, the outstanding  shares of Series B Preferred Stock,
Series C Preferred Stock and Series D Preferred Stock will automatically convert
into shares of Common Stock on a  ten-for-one  basis.  Sales of shares of Common
Stock,  including  shares  issued  upon  conversion  of  outstanding  shares  of
Preferred Stock and shares issued upon the exercise of outstanding  options,  in
the public market could  adversely  affect the market price of the Common Stock.
Such  sales also might make it more  difficult  for the  Company to sell  equity
securities or  equity-related  securities in the future at a time and price that
the Company deems appropriate.

                                        6

<PAGE>

<TABLE>
                              SELLING STOCKHOLDERS

         The following  table sets forth the names of the Selling  Stockholders,
the  number  of  shares  of  Common  Stock,  on  an  as-converted  basis,  owned
beneficially by each Selling  Stockholder prior to this offering,  the number of
shares of Common Stock being offered for the account of each Selling Stockholder
and the number of shares of Common Stock, on an as-converted  basis, to be owned
by each Selling Stockholder after completion of this offering.  This information
is based upon  information  provided  by the Selling  Stockholders.  Because the
Selling  Stockholders  may  offer  all,  some or none of its  Common  Stock,  no
definitive  estimate as to the number of shares thereof that will be held by the
Selling Stockholders after such offering can be provided.

<CAPTION>
                                                    Shares Beneficially          Shares             Shares Beneficially
                                                       Owned Prior to            Being                  Owned After
                                                        Offering (1)             Offered              Offering (1)(2)
                                                  ------------------------       --------            ----------------
            Selling Stockholder                    Number            Percent%                       Number        Percent%
            -------------------                    ------            --------                       ------        --------
<S>                                                       <C>           <C>      <C>                  <C>            <C>
WPG-Farber, Weber Fund, L.P...............                459,000       7.8      459,000              0              -
WPG-Farber, Weber Overseas, L.P...........                 22,500        *        22,500              0              -
Star Creation Ltd.........................                 18,500        *        18,500              0              -
Lombard Odier Zuerich Ltd.................                400,000       6.8      400,000              0              -
Four Partners.............................                360,000       6.1      360,000              0              -
FBB Associates............................                 40,000        *        40,000              0              -
INVESCO Global Health Sciences Fund.......                350,000       5.9      350,000              0              -
H&Q Healthcare Investors..................                150,000       2.5      150,000              0              -
H&Q Life Sciences Investors...............                100,000       1.7      100,000              0              -
BioCentive Limited........................                150,000       2.5      150,000              0              -
PHARMA/wHealth............................                150,000       2.5      150,000              0              -
Caduceus Capital, Ltd.....................                110,000       1.9      110,000              0              -
Caduceus Capital, L.P.....................                 40,000        *        40,000              0              -
Axa U.S. Growth Fund LLC..................                 57,500        *        57,500              0              -
Parvest U.S. Partners II C.V..............                120,000(3)    2.0       20,000            100,000          1.7
U.S. Growth Fund Partners C.V.............                210,000(4)    3.5       20,000            190,000          3.1
Double Black Diamond II LLC...............                 10,000        *        10,000              0              -
Almanori Limited..........................                  2,200        *         2,200              0              -
David Sherry..............................                  2,500        *         2,500              0              -
Multinvest Limited........................              4,300 (5)        *         1,300              3,000          *
Partech International Salary Deferral
  Plan U/A Dated 1/1/92
  FBO: Thomas G. McKinley.................                  3,000(6)     *         1,000              2,000          *
Partech International Salary Deferral
  Plan U/A Dated 1/1/92
  FBO: Scott Matson.......................                    500        *           500              0              -
CDC - Valeurs de Croissance...............                 75,000       1.3       75,000              0              -
Punk, Ziegel & Knoell Investors LLC.......                 28,000        *        28,000              0              -
William J. Punk, Jr.......................                  5,000        *         5,000              0              -
Julia P. Gregory..........................                  3,000        *         3,000              0              -
European Medical Ventures Fund SCA........                163,000(7)    2.7       30,000            133,000          2.2
David Bellet..............................                 10,000        *        10,000              0              -
The Pidwell Family Living Trust                                                                                      -
  Dated 6/25/87...........................                  5,000        *         5,000              0
Tony Di Bona..............................                  1,000        *         1,000              0              -
Douglas E. Kelly SEP-IRA..................                  1,000        *         1,000              0              -
Mark Platshon.............................                  2,500        *         2,500              0              -
Sam Eletr, Ph.D. (8)......................                463,759       7.5       50,000            413,759          6.8
<FN>
 *       Represents beneficial ownership of less than 1%.

(1)      Percentage  of ownership  is based on 5,886,253  shares of Common Stock
         outstanding  as of  October  1, 1997 and the number of shares of Common
         Stock, on an as-converted basis, owned as of such date. The

                                        7

<PAGE>

         number of shares of Series B Preferred Stock,  Series C Preferred Stock
         and  Series D  Preferred  Stock  outstanding  as of October 1, 1997 was
         332,288, 123,299 and 40,000,  respectively.  The Series B, Series C and
         Series  D  Preferred  Stock  are  convertible  into  Common  Stock on a
         ten-for-one  basis.  Beneficial  ownership is  determined in accordance
         with the rules of the Securities  and Exchange  Commission and includes
         sole or shared voting or investment  power with respect to shares shown
         as beneficially owned.

(2)      Assumes the sale of all Shares offered  hereby.  The Company has agreed
         to pay all  reasonable  fees and  expenses  incident  to the  filing of
         offering. See "Plan of Distribution."

(3)      Represents  10,000 shares of Series C Preferred Stock and 20,000 shares
         of Common Stock.

(4)      Represents  15,000 shares of Series B Preferred Stock,  4,000 shares of
         Series C Preferred Stock and 20,000 shares of Common Stock.

(5)      Represents  300 shares of Series C Preferred  Stock and 1,300 shares of
         Common Stock.

(6)      Represents  200 shares of Series C Preferred  Stock and 1,000 shares of
         Common Stock.

(7)      Represents  13,300 shares of Series C Preferred Stock and 30,000 shares
         of Common Stock.

(8)      Includes 217,500 shares of Common Stock issuable upon exercise of stock
         options  held by Dr.  Eletr that are  exercisable  within 60 days.  Dr.
         Eletr is  Chairman  of the  Board and Chief  Executive  Officer  of the
         Company.
</FN>
</TABLE>

                                        8

<PAGE>

                              PLAN OF DISTRIBUTION

         The Shares may be offered by the Selling Stockholders from time to time
on the OTC market and the Nasdaq  National  Market in the future,  in  privately
negotiated  transactions  or a  combination  of such  methods of sale,  at fixed
prices that may be changed,  at market prices prevailing at the time of sale, at
prices related to such  prevailing  market prices or at negotiated  prices.  The
Selling Stockholders may effect such transactions by selling the Shares directly
or by or through agents or  broker-dealers  who may receive  compensation in the
form of discounts,  concessions or commissions from the Selling  Stockholders or
the purchasers of the Shares for whom such broker-dealers may act as agent or to
whom  they  sell  as  principal  or both  (which  compensation  to a  particular
broker-dealer might be in excess of customary commissions).

         The Selling  Stockholders and any underwriters,  dealers or agents that
participate in the distribution of the Shares may be deemed to be "underwriters"
within the meaning of the  Securities  Act, and any  discounts,  commissions  or
concessions received by them and any provided pursuant to the sale of the Shares
by them might be deemed to be underwriting  discounts and commissions  under the
Securities  Act. In order to comply with the securities  laws of certain states,
if  applicable,  the  Shares  will be sold in such  jurisdictions  only  through
registered or licensed  brokers or dealers.  In addition,  in certain states the
Shares may not be sold unless they have been registered or qualified for sale or
an exemption from the registration or qualification requirement is available and
is complied with.

         Pursuant to an  agreement  with the Selling  Stockholders,  the Company
will pay  substantially all of the expenses incident to the offering and sale to
the public of the Shares offered hereby, other than commissions, concessions and
discounts of  underwriters,  dealers or agents.  Such expenses  (excluding  such
commissions  and  discounts)  are estimated to be  approximately  $60,000.  Such
agreement provides for the cross-indemnification of the Selling Stockholders and
the  Company  to the extent  permitted  by law,  for  losses,  claims,  damages,
liabilities  and  expenses  arising,  under  certain  circumstances,  out of any
registration of the Shares.

                                  LEGAL MATTERS

         The  validity  of the  issuance of the shares of Common  Stock  offered
hereby  will be passed upon for the Company by Cooley  Godward  LLP,  Palo Alto,
California ("Cooley Godward"). As of the date of this Prospectus, Cooley Godward
beneficially owns 700 shares of Series B Preferred Stock, 300 shares of Series C
Preferred  Stock and 10,000  shares of Common Stock  issuable  upon  exercise of
stock options held by James C. Kitch, a partner of Cooley Godward,  on behalf of
Cooley Godward. In addition, Mr. Kitch is a director of the Company.

                                     EXPERTS

         The  consolidated  financial  statements  of  Lynx  Therapeutics,  Inc.
appearing in the Company's  Annual Report on Form 10-K for the fiscal year ended
December 31, 1996, have been audited by Ernst & Young LLP, independent auditors,
as set forth in their report thereon included therein and incorporated herein by
reference.  Such consolidated  financial  statements are incorporated  herein by
reference in reliance  upon such report given upon the authority of such firm as
experts in accounting and auditing.

                                        9

<PAGE>
================================================================================

         NO DEALER,  SALESPERSON OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY  REPRESENTATIONS  OTHER THAN THOSE  CONTAINED IN THIS
PROSPECTUS AND, IF GIVEN OR MADE, SUCH INFORMATION OR  REPRESENTATIONS  MUST NOT
BE  RELIED  UPON  AS  HAVING  BEEN  AUTHORIZED  BY  THE  COMPANY,   ANY  SELLING
STOCKHOLDERS  OR BY ANY OTHER PERSON.  THIS  PROSPECTUS  DOES NOT  CONSTITUTE AN
OFFER TO SELL OR A SOLICITATION OF AN OFFER TO BUY ANY SECURITIES OTHER THAN THE
SHARES OF COMMON STOCK OFFERED  HEREBY,  NOR DOES IT CONSTITUTE AN OFFER TO SELL
OR A  SOLICITATION  TO BUY ANY OF THE SHARES OFFERED HEREBY TO ANY PERSON IN ANY
JURISDICTION  IN WHICH SUCH OFFER OR  SOLICITATION  WOULD BE  UNLAWFUL OR TO ANY
PERSON TO WHOM IT IS UNLAWFUL.  NEITHER THE DELIVERY OF THIS  PROSPECTUS NOR ANY
OFFER  OR SALE  MADE  HEREUNDER  SHALL,  UNDER  ANY  CIRCUMSTANCES,  CREATE  ANY
IMPLICATION  THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF THE COMPANY OR THAT
THE  INFORMATION  CONTAINED  HEREIN IS CORRECT AS OF ANY TIME  SUBSEQUENT TO THE
DATE HEREOF.

                                   ----------

                                TABLE OF CONTENTS
                                                                            Page
                                                                            ----
                                                                         
Available Information........................................................  2
Incorporation of Certain Documents by                                    
  Reference..................................................................  2
Forward Looking Statements...................................................  2
The Company..................................................................  3
Risk Factors.................................................................  3
Selling Stockholders.........................................................  7
Plan of Distribution.........................................................  9
Legal Matters................................................................  9
Experts......................................................................  9

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


                                2,675,500 Shares


                             Lynx Therapeutics, Inc.


                                  Common Stock


                                   ----------


                                   PROSPECTUS


                                   ----------


                                OCTOBER __, 1997


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

                                       10

<PAGE>

                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.  Other Expenses of Issuance and Distribution

         The following  table sets forth all expenses  payable by the Registrant
in  connection  with the sale of the  Common  Stock  being  registered.  All the
amounts  shown are  estimates  except  for the  registration  fee and the Nasdaq
Listing Fee.

                  Registration fee........................    $11,351
                  Nasdaq listing fee......................     18,500
                  Printing expenses.......................      1,500
                  Legal fees and expenses.................     25,000
                  Accounting fees and expenses............      2,000
                  Miscellaneous...........................      1,649
                                                              -------
                          TOTAL...........................    $60,000

Item 15.  Indemnification of Officers and Directors.

         Under  Section  145  of  the  Delaware  General  Corporation  Law,  the
Registrant  has broad powers to indemnify  its  directors  and officers  against
liabilities they may incur in such capacities,  including  liabilities under the
Securities  Act of 1933, as amended (the  "Securities  Act").  The  Registrant's
Bylaws also  provide  that the  Registrant  will  indemnify  its  directors  and
executive officers and may indemnify its other officers, employees and agents to
the fullest extent permitted by Delaware law.

         The  Registrant's   Certificate  of  Incorporation   provides  for  the
elimination  of  liability  for  monetary  damages for breach of the  directors'
fiduciary duty of care to the Registrant and its stockholders.  These provisions
do not eliminate the directors' duty of care and, in appropriate  circumstances,
equitable remedies such an injunctive or other forms of non-monetary relief will
remain available under Delaware law. In addition, each director will continue to
be subject to  liability  for  breach of the  director's  duty of loyalty to the
Registrant,  for acts or omissions  not in good faith or  involving  intentional
misconduct,  for knowing  violations of law, for any transaction  from which the
director derived an improper personal  benefit,  and for payment of dividends or
approval of stock  repurchases or  redemptions  that are unlawful under Delaware
law. The provision does not affect a director's responsibilities under any other
laws,  such as the  federal  securities  laws or state or federal  environmental
laws.


Item 16. Exhibits and Financial Statement Schedules

         (a)  Exhibits

         Exhibit
         Number      Description of Document
         ------      -----------------------
         4.1         Form of Common Stock Purchase Agreement, dated as of 
                     September 28, 1997, by and between the Company and the
                     investors listed therein.
         5.1         Opinion of Cooley Godward LLP.
         23.1        Consent of Ernst & Young LLP, Independent Auditors.
         23.2        Consent of Cooley Godward LLP.  Reference is made to
                     Exhibit 5.1.
         24.1        Power of Attorney.  Reference is made to page II-3.

                                      II-1

<PAGE>

Item 17.  Undertakings.

         The undersigned registrant hereby undertakes:

         (1) To file, during any period in which offers or sales are being made,
a  post-effective  amendment  to this  Registration  Statement  to  include  any
material  information  with respect to the plan of  distribution  not previously
disclosed  in  the  registration  statement  or  any  material  change  to  such
information in the registration statement.

         (2) That,  for the  purpose  of  determining  any  liability  under the
Securities Act of 1933, each such post-effective amendment shall be deemed to be
a new registration statement relating to the securities offered therein, and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof; and

         (3) To remove from registration by means of a post-effective  amendment
any of the securities being registered which remain unsold at the termination of
the offering.

         The  undersigned  registrant  hereby  undertakes  that, for purposes of
determining  any liability  under the Securities Act of 1933, each filing of the
registrant's  annual report pursuant to Section 13(a) or 15(d) of the Securities
Exchange  Act of 1934 that is  incorporated  by  reference  in the  registration
statement  shall be deemed to be a new  registration  statement  relating to the
securities  offered  therein,  and the offering of such  securities at that time
shall be deemed to be the initial bona fide offering thereof.

         Insofar as indemnification for liabilities arising under the Securities
Act may be  permitted to  directors,  officers  and  controlling  persons of the
registrant  pursuant  to  provisions  described  in Item 15, or  otherwise,  the
registrant  has been advised that in the opinion of the  Securities and Exchange
Commission  such  indemnification  is against  public policy as expressed in the
Securities Act and is, therefore,  unenforceable.  In the event that a claim for
indemnification  against  such  liabilities  (other  than  the  payment  by  the
registrant of expenses  incurred or paid by a director,  officer or  controlling
person of the  registrant  in the  successful  defense  of any  action,  suit or
proceeding)  is  asserted by such  director,  officer or  controlling  person in
connection with the securities being registered,  the registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit  to a  court  of  appropriate  jurisdiction  the  question  whether  such
indemnification  by it is against  public policy as expressed in the  Securities
Act and will be governed by the final adjudication of such issue.

                                      II-2

<PAGE>

                                   SIGNATURES

         Pursuant  to the  requirements  of the  Securities  Act  of  1933,  the
Registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-3 and has duly caused this Registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized,  in the City of  Hayward,  State of  California,  on the 31st day of
October, 1997.

                              LYNX THERAPEUTICS, INC.

                              By:    /s/ Sam Eletr
                                 -----------------------------------------------
                                       Sam Eletr, Ph.D.
                                       Chairman and Chief Executive Officer
                                       (Principal Executive Officer)

                                POWER OF ATTORNEY

         KNOW ALL PERSONS BY THESE  PRESENTS,  that each person whose  signature
appears below constitutes and appoints Sam Eletr and Edward C. Albini,  and each
or any one of them, his or her true and lawful  attorney-in-fact and agent, with
full power of substitution and resubstitution,  for him or her and in his or her
name, place and stead, in any and all capacities, to sign any and all amendments
(including  post-effective  amendments) to this Registration  Statement,  and to
file the same,  with all exhibits  thereto,  and other  documents in  connection
therewith,  with the  Securities  and Exchange  Commission,  granting  unto said
attorneys-in-fact  and agents,  and each of them, full power and authority to do
and perform each and every act and thing  requisite  and necessary to be done in
connection therewith, as fully to all intents and purposes as he or she might or
could  do  in  person,   hereby   ratifying   and   confirming   all  that  said
attorneys-in-fact  and agents,  or any of them, or their or his  substitutes  or
substitute, may lawfully do or cause to be done by virtue hereof.

<TABLE>
         Pursuant  to the  requirements  of the  Securities  Act of  1933,  this
Registration  Statement  has been signed below by the  following  persons in the
capabilities and on the dates indicated.
<CAPTION>
                    Signature                                         Title                              Date
                    ---------                                         -----                              ----
<S>                                                  <C>                                           <C> 
 /s/ Sam Eletr                                       Chairman and Chief Executive                  October 31, 1997
- ---------------------------------------              Officer
                Sam Eletr                              (Principal Executive Officer)

                                          

 /s/ Edward C. Albini                                Chief Financial Officer                       October 31, 1997
- ---------------------------------------                (Principal Financial and
            Edward C. Albini                            Accounting Officer)

 /s/ William K. Bowes, Jr.                           Director                                      October 31, 1997
- ---------------------------------------
          William K. Bowes, Jr.

/s/ Craig C. Taylor                                  Director                                      October 31, 1997
- ---------------------------------------
             Craig C. Taylor

 /s/ Sydney Brenner                                  Director                                      October 31, 1997
- ---------------------------------------
             Sydney Brenner

                                                     Director                                      October ___, 1997
- ---------------------------------------
          Kathleen D. La Porte

/s/ James C. Kitch                                   Director                                      October 31, 1997
- ---------------------------------------
             James C. Kitch

</TABLE>

                                      II-3

<PAGE>

                                INDEX TO EXHIBITS

Exhibit
Number     Description of Document
- ------     -----------------------

4.1        Form of Common Stock Purchase Agreement, dated as of 
           September 28, 1997, by and between the Company and
           the investors listed therein.
5.1        Opinion of Cooley Godward LLP.
23.1       Consent of Ernst & Young LLP, Independent Auditors.
23.2       Consent of Cooley Godward LLP.  Reference is made to Exhibit 5.1.
24.1       Power of Attorney.  Reference is made to page II-3.


                                                                     Exhibit 4.1

                     FORM OF COMMON STOCK PURCHASE AGREEMENT


<PAGE>

                             LYNX THERAPEUTICS, INC.

                         COMMON STOCK PURCHASE AGREEMENT

         This COMMON STOCK PURCHASE  AGREEMENT (this  "Agreement") is made as of
September 26, 1997, by and among LYNX THERAPEUTICS, INC., a Delaware corporation
(the "Company"),  with its principal  office at 3832 Bay Center Place,  Hayward,
California  94545, and the persons listed on the Schedule of Investors  attached
hereto  as  Exhibit  A  (individually,  a  "Purchaser,"  and  collectively,  the
"Purchasers").

SECTION 1         AUTHORIZATION AND SALE OF COMMON STOCK

         1.1 Authorization.  The Company has authorized the sale and issuance of
up to Two Million Seven Hundred Thousand (2,700,000) shares of its common stock,
par value $.01 per share (the "Common Stock"), pursuant to this Agreement.

         1.2  Sale of  Common.  Subject  to the  terms  and  conditions  of this
Agreement,  the  Company  agrees to issue and sell to each  Purchaser,  and each
Purchaser  severally  agrees to purchase  from the Company,  on the Closing Date
hereinafter  defined,  the number of shares of Common  Stock set forth  opposite
such Purchaser's  name on Exhibit A (collectively,  the "Shares") for a purchase
price of $10.00 per share (the "Purchase Price").

SECTION 2         CLOSING DATE; DELIVERY

         2.1 Closing  Date.  The closing of the  purchase and sale of the Shares
hereunder  (the  "Closing")  shall be held at the offices of Cooley Godward LLP,
Five Palo Alto Square,  3000 El Camino Real, Palo Alto,  California at 9:00 a.m.
(Pacific  Daylight Time), on the third business day following the date hereof or
at such  other  time  and  place  upon  which  the  Company  and the  Purchasers
purchasing  the majority of the Shares  shall agree.  The date of the Closing is
hereinafter referred to as the "Closing Date."

         2.2  Delivery.  At the  Closing,  the  Company  will  deliver  to  each
Purchaser a certificate,  registered in the Purchaser's name as shown on Exhibit
A,  representing  the number of shares of Common  Stock to be  purchased by such
Purchaser. Such delivery shall be against payment of the Purchase Price therefor
by wire transfer of immediately available funds in the amount set forth opposite
such  Purchaser's  name on Exhibit A to a bank account  designated in writing by
the  Company  to each  Purchaser  at least two (2)  business  days  prior to the
Closing Date.  Each Purchaser  shall only be obligated to pay the Purchase Price
of the Shares purchased by it.

SECTION 3         REPRESENTATIONS AND WARRANTIES OF THE COMPANY

         The  Company  represents  and  warrants to the  Purchasers  as follows,
effective as of the date hereof and the Closing Date:

         3.1  Organization  and  Standing.  The  Company is a  corporation  duly
organized,  validly existing and in good standing under the laws of the State of
Delaware.  The Company  has all  requisite  corporate  power to own or lease and
operate its  properties  and assets and to carry on its  business  as  presently
conducted  and as proposed to be  conducted.  The Company is duly  qualified  to
transact  business  and is in good  standing in each  jurisdiction  in which the
failure to be so qualified would have a material  adverse effect on its business
or properties.

         3.2 Corporate  Power. The Company has all requisite legal and corporate
power to execute and deliver this Agreement, to sell and issue the Shares and to
carry  out and  perform  its  obligations  under  the  terms  of this  Agreement
including all exhibits and schedules hereto.

         3.3  Capitalization.  The  authorized  capital  stock  of  the  Company
consists of (i) 20,000,000 shares of Common Stock, of which 3,207,903 shares are
issued and  outstanding as of September 10, 1997,  and (ii) 2,000,000  shares of
Preferred Stock, par value $.01 per share (the "Preferred"),  (a) 332,288 shares
of which have been designated Series B Convertible  Preferred Stock (the "Series
B Preferred"),  of which all 332,288 shares are issued and outstanding as of the
date  hereof,  (b)  123,299  shares  of  which  have  been  designated  Series C
Convertible  Preferred  Stock (the "Series C  Preferred"),  of which all 123,299
shares are issued and  outstanding as of the date hereof,  and (c) 40,000 shares
of which have been designated Series D Convertible  Preferred Stock (the "Series
D Preferred"),  of which all 40,000 shares are issued and  outstanding as of the
date hereof. The rights,

                                        2

<PAGE>

privileges  and  preferences  of the  Series B  Preferred  are as  stated in the
Certificate  of Amendment to Certificate of Designation of Preferences of Series
B  Convertible  Preferred  Stock,  dated  October  31,  1995,  as amended by the
Certificate of Amendment thereto dated December 23, 1996 (together,  the "Series
B Certificate of  Designation").  The rights,  privileges and preferences of the
Series  C  Preferred  are as  stated  in the  Certificate  of  Amendment  to the
Certificate of  Designation  of  Preferences  of Series C Convertible  Preferred
Stock,  dated  October 31,  1995,  as amended by the  Certificate  of  Amendment
thereto  dated  December  23,  1996  (together,  the  "Series C  Certificate  of
Designation").  The rights, privileges and preferences of the Series D Preferred
are as stated in the Series D  Certificate  of  Designation  of  Preferences  of
Series D Convertible  Preferred Stock, dated October 31, 1995, as amended by the
Certificate of Amendment thereto dated December 23, 1996 (together,  the "Series
D Certificate of Designation").  The Company has heretofore  delivered or caused
to be delivered to the Purchasers and Weil, Gotshal & Manges LLP, counsel to the
Purchasers  ("Purchasers'  Counsel"),  true,  correct and complete copies of the
Series B Certificate of  Designation,  the Series C Certificate of  Designation,
the Series D Certificate of Designation, the Amended and Restated Certificate of
Incorporation of the Company (as amended through the date hereof) and the Bylaws
of the Company (as amended  through the date  hereof).  The minute  books of the
Company  previously made available to Purchasers'  Counsel contain  complete and
accurate  records of all meetings  and  accurately  reflect all other  corporate
actions  of the  stockholders  and  board  of  directors  (including  committees
thereof) of the Company. All such issued and outstanding shares of Common Stock,
Series B  Preferred,  Series C Preferred  and Series D Preferred  have been duly
authorized and validly issued and are fully paid and nonassessable.  The Company
has  reserved  (i)  3,400,000  shares of Common  Stock for issuance to officers,
directors, employees and consultants as may be determined by the Company's Board
of  Directors  from time to time,  of which  options to purchase an aggregate of
1,577,522  shares of Common Stock are issued and outstanding as of September 10,
1997,  and  (ii)  152,400  shares  of  Common  Stock  for  issuance  to  Applied
Biosystems,  Inc. ("ABI") upon exercise of the stock purchase option, granted as
of October 1, 1992,  with an  exercise  price of $.001 per share (the  "Purchase
Option"). Except for (A) the conversion privileges of the Series B Preferred set
forth in the Series B Certificate of Designation,  (B) the conversion privileges
of the Series C Preferred set forth in the Series C Certificate of  Designation,
(C) the conversion  privileges of the Series D Preferred set forth in the Series
D Certificate of Designation,  (D) outstanding  options to purchase an aggregate
of  1,577,522  shares of Common  granted  pursuant to the  Company's  1992 Stock
Option Plan, (E) the Purchase  Option,  (F) rights provided in the  Shareholders
Agreement,  dated October 1, 1992, by and among the Company,  Chiron Corporation
and ABI (the "Chiron/ABI Agreement"), (G) rights provided in the Investor Rights
Agreement dated as of November 1, 1995, among the Company and certain holders of
Series B Preferred, certain holders of Series C Preferred and certain holders of
Series D  Preferred  (the  "Investor  Rights  Agreement"),  (H) the  rights  and
obligations of Hoechst Marion Roussel,  Inc. to purchase up to 400,000 shares of
Preferred  or  Common  Stock  pursuant  to that  certain  Series  D  Convertible
Preferred  Stock  Purchase  Agreement  dated as of October  2,  1995,  and (I) a
warrant  to be issued in  connection  with this  transaction  to Punk,  Ziegel &
Company to purchase up to 75,000  shares of Common  Stock (the "PZ&C  Warrant"),
(i) there are no outstanding rights of first refusal, preemptive rights or other
rights (contingent or otherwise),  options,  warrants,  convertible  securities,
conversion  rights,  or other  agreements  either directly or indirectly for the
purchase or  acquisition  from, or the issuance by, the Company of any shares of
its  capital  stock,  and (ii) the  Company  has no  obligation  (contingent  or
otherwise)  to purchase,  redeem or otherwise  acquire any shares of its capital
stock  or any  interest  therein  or to pay  any  dividend  or  make  any  other
distribution  in respect  thereof.  Except  for its joint  venture  interest  in
BASF-LYNX  Bioscience AG, the Company does not own, directly or indirectly,  any
interest  in any  joint  venture,  partnership,  corporation  or other  business
entity.  Except for the Chiron/ABI  Agreement and the Investor Rights Agreement,
to the Company's  knowledge,  there are no outstanding  stockholder  agreements,
voting  trusts,  proxies  or other  arrangements  or  understandings  among  the
stockholders of the Company relating to the voting of their respective shares.

         3.4      Authorization.

                  (a) All  corporate  action  on the  part of the  Company,  its
directors and stockholders necessary for the authorization,  execution, delivery
and  performance  of the  Agreement by the  Company,  the  authorization,  sale,
issuance  and  delivery  of the  Shares  and the  performance  of the  Company's
obligations under the Agreement has been taken. The Agreement, when executed and
delivered by the Company,  will constitute valid and binding  obligations of the
Company  enforceable in accordance with their terms,  subject to laws of general
application relating to bankruptcy,  insolvency,  the relief of debtors, general
equity principles,  and limitations upon rights to indemnity.  The Shares,  when
issued in compliance  with the  provisions of this  Agreement,  will be duly and
validly  issued,  fully  paid,  and  nonassessable,  and will not be  issued  in
violation of any preemptive rights.

                  (b) The Company has heretofore delivered to the Purchasers and
Purchasers'  Counsel true,  correct and complete copies of the Waiver Agreements
that the Company obtained from certain of its current

                                        3

<PAGE>

security  holders (the "Waiver  Agreements").  As a result of the  execution and
delivery of the Waiver  Agreements,  the  preemptive  rights with respect to the
issuance of any capital  stock of the Company  contained in the Investor  Rights
Agreement have been legally and effectively waived.

                  (c) Assuming that ABI and Chiron are not  "affiliates"  of the
Company,  as that term is  defined in Rule  144(a) of the  Securities  Act,  the
capital stock of the Company held by ABI and Chiron is freely tradeable pursuant
to Rule 144(k) of the Securities Act. ABI's and Chiron's  preemptive rights have
terminated pursuant to Section 4.8 of the Chiron/ABI Agreement.

         3.5      Financial Information; SEC Reports.

                  (a)  The  Company  has  delivered  to  the  Purchasers  (i) an
unaudited  consolidated  balance  sheet  at  June  30,  1997  and  (ii)  audited
consolidated balance sheets at December 31, 1996, and December 31, 1995, in each
case,  together  with  the  related   consolidated   statements  of  operations,
stockholders'   equity  and  cash   flows  for  the   period   then  ended  (the
"Financials").  The Financials  have been prepared in accordance  with generally
accepted accounting  principles  consistently  applied by the Company throughout
the periods  involved,  except for accounting  changes  described in the related
notes thereto,  and present  fairly the financial  position of the Company as of
the respective dates of said balance sheets and the results of operations of the
Company  for the  respective  periods  covered.  The  Financials  at, or for the
quarterly period ending, June 30, 1997 are hereinafter  referred to as the "June
1997 Financials."

                  (b)  Since June 30, 1997 there has not been:

                           (i) any change in the assets, liabilities,  financial
condition  or operating  results of the Company from that  reflected in the June
1997  Financials,  except changes in the ordinary  course of business which have
not been,  in the  aggregate,  materially  adverse to the  financial  condition,
operating results, prospects or business of the Company;

                           (ii) any damage,  destruction or loss or interruption
in use of any material asset or property of the Company,  whether or not covered
by  insurance,  materially  and  adversely  affecting  the  assets,  properties,
financial condition, operating results, prospects or business of the Company (as
such business is presently conducted and as it is proposed to be conducted);

                           (iii) any waiver by the  Company of a valuable  right
or of a material debt owed to it;

                           (iv) any satisfaction or discharge of any lien, claim
or  encumbrance  or  payment of any  obligation  by the  Company,  except in the
ordinary course of business and which is not material to the assets, properties,
financial  condition,  operating  results or  business  of the  Company (as such
business is presently conducted and as it is proposed to be conducted);

                           (v) any change or amendment to a material contract or
arrangement  by which the Company or any of its assets or properties is bound or
subject, except for an amendment, dated as of September 1, 1997, to that certain
Technology  Development  and Services  Agreement dated as of October 2, 1995, by
and between the Company and Hoechst  Marion  Roussel,  Inc., a copy of which has
been provided to the Purchasers;

                           (vi) any change in any  compensation  arrangement  or
agreement  with any employee of or consultant to the Company,  other than normal
merit or longevity increases in the ordinary course of business;

                           (vii) any change in the  accounting or tax methods or
practices  of the  Company  or the  making or  changing  by the  Company  of any
material tax election; or

                           (viii) to the Company's knowledge, any other event or
condition of any character which  reasonably could be expected to materially and
adversely affect the assets, properties,  financial condition, operating results
or business of the Company (as such business is presently conducted and as it is
proposed to be conducted).

                  (c) Except to the extent  reflected or reserved against in the
balance  sheets  contained  in the  Financials  and except  for fees  payable in
respect of this transaction to Punk, Ziegel & Company, the Company does not have
any  indebtedness,  liability or obligation of any nature in an amount in excess
of $50,000,  whether absolute,  accrued,  contingent,  or otherwise  (including,
without limitation, liabilities as guarantor or otherwise with respect

                                        4

<PAGE>

to obligations of others) and whether due or to become due,  including,  without
limitation,  any  liabilities  for taxes of the Company for any period  prior to
such date, or arising out of any  transaction of the Company  entered into prior
to such date or arising  out of any state of facts  arising  prior to such date.
The Company does not know and has no reasonable  ground to know of any basis for
the assertion  against the Company of any claim or liability of any nature or in
any amount not fully reflected or reserved against in the Financials or referred
to in this Section 3.5.

                  (d) The  Company  has filed in a timely  manner all  documents
that the Company was required to file with the SEC under  Sections 13, 14(a) and
15(d) of the  Securities  Exchange  Act of 1934,  as amended,  and the rules and
regulations of the SEC promulgated  thereunder (the "Exchange Act"),  during the
twelve (12) months preceding the date of this Agreement.  As of their respective
filing  dates,  all  documents  filed by the  Company  with  the SEC  (the  "SEC
Reports")  complied  in all  material  respects  with  the  requirements  of the
Exchange Act, and did not contain, as of the respective date of such SEC Report,
any untrue  statement  of a  material  fact or omitted as of its date to state a
material fact necessary in order to make the statements  made therein,  in light
of the circumstances in which they were made, not misleading.

         3.6  Compliance  with Other  Instruments,  etc. The Company is not, and
will not by  virtue of  entering  into and  performing  this  Agreement  and the
transactions  contemplated  thereunder  be,  in  violation  of any  term  of its
Restated  Certificate of  Incorporation,  Series B Certificate  of  Designation,
Series C Certificate  of  Designation,  Series D Certificate  of  Designation or
Bylaws,  or  any  term  or  provision  of  any  mortgage,  indenture,  contract,
agreement,  instrument, judgment or decree to which it is a party or by which it
is bound,  and is not,  and will not by virtue of entering  into and  performing
this Agreement and the transactions  contemplated thereunder be, in violation of
any  order  addressed  specifically  to the  Company  nor,  to the  best  of the
Company's knowledge,  any order,  statute,  rule or regulation applicable to the
Company,  other than any of the foregoing such  violations  that do not,  either
individually  or in  the  aggregate,  have  a  material  adverse  effect  on the
Company's financial condition, operating results, prospects or business (as such
business is presently conducted or as it is planned to be conducted).


         3.7  Litigation,  etc.  There are no  actions,  suits,  proceedings  or
investigations  pending  or,  to the  best  knowledge  of the  Company,  overtly
threatened  against  the  Company  before  any  court  or  governmental  agency,
department,  commission or instrumentality;  nor to the knowledge of the Company
is  there  any  reasonable  basis  for  any  such  action,  proceeding,  suit or
investigation. There is no judgment, decree, injunction or order of any court in
effect against the Company.

         3.8 Employees. The Company has no collective bargaining agreements with
any of its employees and there is no labor union organizing  activity pending or
threatened  with respect to the Company.  To the best  knowledge of the Company,
there are no  pending or  overtly  threatened  material  unfair  labor  practice
charges or employee  grievance  charges with respect to the Company's  business.
Except for the Company's  401(k) plan,  health and insurance plan,  stock option
plan and employee  benefit plan,  there is no pension,  health,  profit sharing,
bonus, stock purchase, stock option,  hospitalization,  insurance, severance, or
any other employee  benefit or welfare  benefit plan with respect to any officer
or  employee  of the  Company.  The Company is not aware that any officer or key
employee,  or that any  group  of key  employees,  intends  to  terminate  their
employment with the Company.  The Company is not aware that any of its employees
is obligated under any contract (including licenses, covenants or commitments of
any nature) or other agreement,  or subject to any judgment,  decree or order of
any court or  administrative  agency,  that would interfere with the use of such
employee's  best  efforts to promote the  interests of the Company or that would
conflict  with the Company's  business as presently  conducted or proposed to be
conducted.  Neither  the  execution  nor  delivery  of this  Agreement,  nor the
carrying on of the Company's  business by the employees of the Company,  nor the
conduct of the  Company's  business as proposed,  will,  to the  Company's  best
knowledge,  conflict  with or  result in a breach of the  terms,  conditions  or
provisions  of, or  constitute  a  default  under,  any  contract,  covenant  or
instrument under which any of such employees is now obligated.  All employees of
the  Company  have  entered  into the  Company's  standard  form of  Proprietary
Information and Inventions Agreement.

         3.9  Registration  Rights.  Except as set forth in the Investor  Rights
Agreement,  the Chiron/ABI  Agreement and Section 7.2 hereto, the Company is not
under any  obligation  to register  (as defined in Section  1.10 of the Investor
Rights  Agreement)  any of its  presently  outstanding  securities or any of its
securities  that may  hereafter  be  issued.  As a result of the  execution  and
delivery of the Waiver  Agreements,  the  registration  rights  contained in the
Investor  Rights  Agreement  with  respect to the  issuance  and purchase of the
Shares have been legally and effectively waived.

                                        5

<PAGE>

         3.10 Compliance With Laws;  Permits.  The Company is in compliance with
all Laws (as defined  below)  applicable to it or to the conduct of its business
or operations or the use of its properties  (including  leased  properties)  and
assets,  except for such  non-compliance  as would not,  individually  or in the
aggregate,  have a material adverse effect on the Company's financial condition,
operating  results,  prospects  or  business  (as  such  business  is  presently
conducted  or  as  it  is  proposed  to  be  conducted).  The  Company  has  all
governmental  permits and  approvals  from state,  local or federal  authorities
which are  currently  required for the Company to operate its  business,  except
those the absence of which would not,  individually or in the aggregate,  have a
material adverse effect on the Company's financial condition, operating results,
prospects  or business  (as such  business is  presently  conducted  or as it is
proposed to be conducted).  As used herein, "Laws" shall mean all federal, state
or local laws (including common law), statute, code, ordinance, rule, regulation
or other requirement or guideline or judicial or administrative decision.

         3.11 Governmental Consent,  etc. No consent,  approval or authorization
of or  designation,  declaration  or  filing  with any  federal,  state or local
governmental authority, department, agency or instrumentality on the part of the
Company is required in connection  with the valid  execution and delivery of the
Agreement,  or the offer,  sale or issuance of the Shares or the consummation of
any other transaction  contemplated thereby, except the filing of (a) amendments
to the Series B  Certificate  of  Designation  and the Series C  Certificate  of
Designation,  as contemplated by Section 5.4 herein, with the Secretary of State
of the State of Delaware,  and (b) the required notices pursuant to Regulation D
promulgated  by the SEC,  which filing the Company agrees to make within fifteen
(15) days of the Closing.

         3.12  Offering.  Neither the Company nor any person or entity acting on
the  Company's  behalf  has  engaged  or will  engage  in any  form  of  general
solicitation  of general  advertising  (within the meaning of Regulation D under
the  Securities  Act) in connection  with any offer or sale of the Shares in the
United  States.  The Company  has not  issued,  offered or sold shares of Common
Stock   (including  for  this  purpose  any  securities   convertible   into  or
exchangeable or exercisable  for Common Stock) within the six-month  period next
preceding  the date hereof,  except as  disclosed  in the SEC  Reports,  and the
Company shall not, directly or indirectly, take, and shall not permit any of its
directors,  officers or affiliates,  directly or indirectly, to take, any action
(including,  without limitation, any offering or sale to any person or entity of
shares of Common Stock) so as to make  unavailable the exemption from Securities
Act registration  being relied upon by the Company for the offer and sale to the
Purchasers  of the  Shares  as  contemplated  by this  Agreement.  Assuming  the
accuracy of the  representations  and warranties of the Purchasers  contained in
Section 4 hereof, the offer, issuance and sale of the Shares are exempt from the
registration and prospectus delivery requirements of the Securities Act, and the
Shares have been  registered or qualified (or are exempt from  registration  and
qualification) under the registration,  permit, or qualification requirements of
all applicable state securities laws.

         3.13 Certain Transactions. Since June 30, 1997, the Company has not (a)
discharged or satisfied any  obligation or liability  other than in the ordinary
course of  business,  (b)  declared or made any payment or  distribution  to its
stockholders  or redeemed  or  purchased  any of its shares of capital  stock or
securities,  (c) mortgaged or subjected to encumbrances  any of its assets,  (d)
sold,  transferred  or leased to third  parties any of its assets  except in the
ordinary  course of business,  (e) canceled or compromised  any material debt or
any claim or waived  or  released  any right of  material  value,  suffered  any
physical  damage or destruction or loss  materially and adversely  affecting its
properties,  operations  or  business,  (f) made any  loans or  advances  to any
persons other than immaterial  amounts (both  individually and in the aggregate)
in the ordinary course of business or (g) entered into any material  transaction
other than in the ordinary  course of business or agreed to any of the foregoing
other than with respect to  transactions  relating to this Agreement  except for
purchases of unvested securities from terminated employees.

         3.14 Title to Properties  and Assets;  Right to Conduct  Business.  The
Company has good and marketable title to its properties and assets,  and, to the
best of its knowledge, has good title to all its leasehold estates, in each case
subject  to no  mortgage,  lien,  loan or  encumbrance,  except  such  liens and
encumbrances  which  arise  in  the  ordinary  course  of  business  and  do not
materially  impair the  operations  of the Company.  As of the date hereof,  the
Company owns no real property in fee.  With respect to property it leases,  such
property  is held by the  Company  under  valid and  subsisting  leases  and the
Company is in compliance with such leases in all material respects.  The Company
has, or in good faith after  commercially  reasonable  efforts  believes that it
will have, all rights  necessary to conduct its business as now conducted and as
proposed to be conducted.

         3.15 Patents and Trademarks.  To the best of its knowledge, the Company
owns the entire  right,  title and interest  in, or license  rights  under,  all
patents,   patent   applications,   trademarks,   service  marks,  trade  names,
copyrights,  trade  secrets,  information,   proprietary  rights  and  processes
(including designs, specifications, formulas,

                                        6

<PAGE>

composition,  methods  and  procedures  and  computer  software)  (collectively,
"Proprietary  Information")  necessary  for its business as now conducted and as
proposed to be conducted without any conflict with or infringement of the rights
of  others.  To the  best  knowledge  of the  Company,  none of the  Proprietary
Information is being  infringed,  misappropriated  or otherwise  violated by any
person or  entity.  No claim or demand of any person or entity has been made nor
is there  any  proceeding  that is  pending  or,  to the best  knowledge  of the
Company,  threatened,  which (i) challenges the rights of the Company in respect
of any  Proprietary  Information or (ii) asserts that the Company is infringing,
misappropriating, violating or otherwise in conflict with, or is required to pay
any royalty, license fee, charge or other amount with regard to, any Proprietary
Information.  None of the Proprietary  Information is subject to any outstanding
order, ruling, decree, judgment or stipulation by or with any court, arbitrator,
or  administrative  agency, or has been the subject or any litigation within the
last year, whether or not resolved in favor of the Company.

         3.16 Tax Returns.  The Company has accurately prepared and timely filed
all  federal,  state and other tax returns  which are required to be filed by it
and has timely paid all taxes  covered by such returns which have become due and
payable. The Company has not been advised, orally or in writing, that any of its
tax returns,  federal,  state, local or other, have been or are being audited as
of the date hereof. The Company is not delinquent in the payment of any taxes or
assessments (federal,  state, local or other), has no tax deficiency proposed or
assessed  and has not waived the statute of  limitations  or extended the period
for assessment or collection of any tax.

         3.17 No Defaults. The Company has, in all material respects,  performed
all  obligations  required to be  performed  by it to date and is not in default
under any of the  contracts,  loans,  notes,  mortgages,  indentures,  licenses,
security  agreements,   agreements,  leases,  documents,  commitments  or  other
arrangements  to which it is a party or by which it is otherwise  bound,  except
for such  defaults  which in the aggregate  would not have a materially  adverse
effect on the business,  prospects,  operating results or financial condition of
the Company,  and no event or condition  has occurred  which,  with the lapse of
time or the giving of notice, or both, would constitute such a default; nor does
the Company have  knowledge or any material  breach by the other parties to such
contracts, agreements or arrangements.

         3.18 Disclosure.  None of the representations or warranties made by the
Company in this Agreement and no information in the Exhibits hereto or otherwise
provided to the  Purchasers  by the Company  contain any untrue  statement  of a
material  fact or omit to state a material  fact  necessary in order to make the
statements contained herein and therein not misleading.

         3.19 Nasdaq NMS Qualification.  Immediately  following the issuance and
purchase of the Shares contemplated by this Agreement,  the Company will satisfy
the eligibility criteria for the Nasdaq National Market ("Nasdaq NMS") and, upon
submitting the appropriate  listing  application and listing  agreement with the
Nasdaq  National  Market,  the Common  Stock,  including  the  Shares,  would be
eligible  for  quotation  on Nasdaq NMS.  The Company will submit a copy of such
application  to the Nasdaq NMS for their  approval  and will  deliver a true and
correct copy of such  application to WPG Farber Weber (as defined in Section 7.5
below) and Purchasers' Counsel as soon as practicable after the Closing Date.

SECTION 4         REPRESENTATIONS, WARRANTIES AND COVENANTS OF THE PURCHASERS

         Each Purchaser hereby severally and not jointly represents and warrants
to the Company, effective as of the Closing Date, as follows:

         4.1  Authorization.  Purchaser  represents  and warrants to the Company
that:  (i) Purchaser  has all  requisite  legal and corporate or other power and
capacity  and has taken all  requisite  corporate or other action to execute and
deliver  this  Agreement,  to purchase  the Shares to be  purchased by it and to
carry out and  perform all of its  obligations  under this  Agreement;  and (ii)
assuming the due execution and delivery of this  Agreement by the Company,  this
Agreement  constitutes the legal, valid and binding obligation of the Purchaser,
enforceable  in accordance  with its terms,  except (a) as limited by applicable
bankruptcy, insolvency, reorganization, or similar laws relating to or affecting
the enforcement of creditors'  rights  generally and (b) as limited by equitable
principles generally.

         4.2 Investment  Experience.  Purchaser is an  "accredited  investor" as
defined  in Rule  501(a)  under the  Securities  Act of 1933,  as  amended  (the
"Securities  Act").  Purchaser is aware of the  Company's  business  affairs and
financial   condition  and  has  had  access  to  and  has  acquired  sufficient
information about the Company to reach an informed and knowledgeable decision to
acquire the Shares. Purchaser has such business and financial

                                        7

<PAGE>



experience  as is required to give it the capacity to protect its own  interests
in connection with the purchase of the Shares.

         4.3 Investment  Intent.  Purchaser is purchasing the Shares for its own
account as principal,  for investment purposes only, and not with a present view
to, or for, resale,  distribution or  fractionalization  thereof, in whole or in
part, within the meaning of the Securities Act.  Purchaser  understands that its
acquisition  of the Shares has not been  registered  under the Securities Act or
registered or qualified  under any state  securities law in reliance on specific
exemptions therefrom,  which exemptions may depend upon, among other things, the
bona fide nature of Purchaser's investment intent as expressed herein. Purchaser
has  completed or caused to be completed the  Purchaser  Questionnaire  attached
hereto as Exhibit B for use in preparation of the Shelf Registration (as defined
below),  will deliver the Purchaser  Questionnaire to the Company on or prior to
the Closing Date, and the responses  provided  therein shall be true and correct
as of the date  hereof and the  Closing  Date and will be true and correct as of
the effective date of the Shelf Registration.

         4.4      Registration or Exemption Requirements.

                  (a) Purchaser  further  acknowledges  and understands that the
Shares  must be held  indefinitely,  and they  may not be  resold  or  otherwise
transferred,  except in a transaction  registered  under the  Securities  Act or
otherwise  exempt from such  registration  requirements  of the Securities  Act.
Purchaser  understands  that the  certificate(s)  evidencing  the Shares will be
imprinted  with a legend  in  substantially  the form set forth in  Section  8.2
hereof that indicates  that the transfer of the Shares is prohibited  unless (i)
they are  registered  or such  registration  is not  required to  transfer  such
Shares, or (ii) the transfer is pursuant to an exemption from registration under
the Securities  Act and, if the Company shall so request in writing,  an opinion
of counsel reasonably satisfactory to the Company is obtained to the effect that
the transaction is so exempt and in compliance with applicable state law.

                  (b) Purchaser further  acknowledges that because the Company's
Common Stock is not currently listed on the Nasdaq NMS or a national  securities
exchange,  resale of the Shares may be limited  by  applicable  state law,  even
where a registration  statement  covering resale of the Shares has been declared
effective under the Securities Act. For example, certain states may limit resale
of the Shares to  qualified  institutions  or in  unsolicited  qualified  broker
transactions in the absence of qualification or another exemption in such state.

         4.5  Restriction on Short Sales.  Purchaser  represents and warrants to
and  covenants  with the  Company  that  Purchaser  has not engaged and will not
engage  in  any  short  sales  of  the  Company's  Common  Stock  prior  to  the
effectiveness of the Shelf  Registration (as defined below) except to the extent
that any such  short  sale is fully  covered  by shares  of Common  Stock of the
Company other than the Shares.

         4.6 No Legal,  Tax or Investment  Advice.  Purchaser  understands  that
nothing in this  Agreement  or any other  materials  presented  to  Purchaser in
connection with the purchase and sale of the Shares  constitutes  legal,  tax or
investment  advice.  Purchaser  has  consulted  such legal,  tax and  investment
advisors as it, in its sole  discretion,  has deemed necessary or appropriate in
connection with its purchase of the Shares.

SECTION 5         CONDITIONS TO CLOSING OF PURCHASERS

         Each  Purchaser's  obligation to purchase the Shares at the Closing is,
at the option of such Purchaser,  subject to the fulfillment or waiver as of the
Closing Date of the following conditions:

         5.1 Representations and Warranties.  The representations and warranties
made by the  Company in Section 3 hereof  shall be true and  correct on the date
hereof,  and shall be true and correct on the  Closing  Date with the same force
and effect as if they had been made on and as of said date.

         5.2 Legal  Opinion.  The Company  shall have  delivered a legal opinion
from  Cooley  Godward  LLP,  counsel to the  Company,  addressed  to each of the
Purchasers in the form attached hereto as Exhibit D.

         5.3 Officers' Certificate.  The Company shall deliver to the Purchasers
a  certificate,  dated as of the  Closing  Date,  signed by the Chief  Executive
Officer  and the Chief  Financial  Officer of the  Company  certifying  that the
representations and warranties set forth in Section 3 are true as of, and all of
the  closing  conditions  set forth in  Section 5 have been  satisfied  on,  the
Closing Date.

                                        8

<PAGE>

         5.4 Amendment of Certificates  of  Designation.  The Company shall have
caused the Series B Certificate of  Designation  and the Series C Certificate of
Designation  to be amended to provide that (i) the Series B Preferred and Series
C Preferred are not convertible into shares of Common Stock until March 31, 1998
and (ii) the  Series B  Preferred  and  Series C  Preferred  will  automatically
convert into shares of Common Stock at the applicable  conversion  rate on March
31, 1998.

         5.5 Covenants.  All covenants,  agreements and conditions  contained in
this  Agreement  to be  performed by the Company on or prior to the Closing Date
shall have been performed or complied with in all material respects.

         5.6      No Injunction, etc.

                           (a) No injunction,  judgment,  order,  writ,  decree,
law, rule or  regulation  shall exist that  restrains,  enjoins or prohibits the
consummation of any of the transactions contemplated hereby or awards damages or
other relief in respect of the consummation of any such transactions.

                           (b) No  Purchaser  shall  be  obligated  to  purchase
Shares which it has agreed to purchase  under this Agreement  unless,  as of the
date immediately  preceding the Closing Date, Purchasers have agreed to purchase
an aggregate of at least $15 million of Shares.

SECTION 6         CONDITIONS TO CLOSING OF COMPANY

         The  Company's  obligation  to sell and issue the Shares at the Closing
is, at the option of the Company,  subject to the  fulfillment  or waiver of the
following conditions:

         6.1  Representations and Warranties.  The  representations  made by the
Purchasers  in  Section  4  hereof  shall be true and  correct  in all  material
respects  on the date  hereof,  and shall be true and  correct  in all  material
respects on the Closing  Date with the same force and effect as if they had been
made on and as of such date.

         6.2 Covenants.  All covenants,  agreements and conditions  contained in
this Agreement to be performed by the Purchasers on or prior to the Closing Date
shall have been performed or complied with in all material respects.

SECTION 7         AFFIRMATIVE COVENANTS OF THE COMPANY

         The Company hereby covenants and agrees as follows:

         7.1 Financial Information.  The Company will mail the following reports
to each Purchaser  until such Purchaser  transfers,  assigns or sells the Shares
purchased by such Purchaser pursuant to this Agreement:

                  (a) As soon as  practicable  after the end of each fiscal year
and in any event  within one  hundred  (100)  days after the end of each  fiscal
year, a copy of its Annual Report on Form 10-K.

                  (b) As soon as practicable  after the end of each of the first
three  quarterly  periods in each fiscal year and in any event within fifty (50)
days after the end of the first,  second and third quarterly  accounting periods
of each fiscal year of the Company, a copy of its Quarterly Report on Form 10-Q.

         7.2      Registration Requirements.

                  (a) Shelf Registration. The Company shall use its best efforts
to prepare and file with the  Securities and Exchange  Commission  (the "SEC") a
Registration  Statement  pursuant to Rule 415 (or any  appropriate  similar rule
that may be adopted by the SEC) under the  Securities  Act  covering  the Shares
(including any amendment thereto, the "Shelf  Registration")  within thirty (30)
days of the Closing Date (the "Filing Date"). The Shelf Registration shall be on
Form S-3 or another appropriate form permitting  registration of such Shares for
resale by the Purchasers from time to time. The Company acknowledges that it has
received all information  from the Purchasers  necessary to register any Shares.
Each  Purchaser  agrees to  furnish  promptly  to the  Company  in  writing  all
information  required  from  time to time to be  disclosed  in order to make the
information previously furnished to the Company by such holder not misleading.

                                        9

<PAGE>

                  (b)  Effectiveness.  The Company shall use its best efforts to
cause the Shelf Registration to become effective under the Securities Act within
sixty  (60)  days of the  Filing  Date (the  "Effective  Date")  and to  prevent
stockholders other than the Purchasers from joining in such Shelf  Registration.
Subject to the requirements of the Securities Act including, without limitation,
requirements relating to updating through post-effective amendments,  prospectus
supplements  or  otherwise,  the Company  shall use its best efforts to keep the
Shelf Registration  continuously effective and in compliance with the Securities
Act until the earlier of (i) the second  anniversary of the Effective Date, (ii)
such date as all of the Shares have been resold or (iii) such time as all of the
Shares  held by the  Purchasers  may be sold within a given  three-month  period
without  compliance  with the  registration  requirements  of the Securities Act
pursuant to Rule 144 under the Securities Act ("Rule 144");  provided,  however,
that in the event of a Suspension Period, as set forth in Section 7.2(c) hereof,
the Company shall extend the period of effectiveness of such Shelf  Registration
by the number of days of each such Suspension  Period. The Company shall use its
best  efforts to take such  actions  under the laws of various  states as may be
required,  from time to time during the effectiveness of the Shelf Registration,
to cause the  resale of the  Shares  pursuant  to the Shelf  Registration  to be
lawful.  The Company will cause,  as of the Effective Date, all the Shares to be
listed for quotation on the Nasdaq NMS.

                  (c) Following the effectiveness of a Shelf  Registration filed
pursuant  to  this  section,   the  Company  may,  at  any  time,   suspend  the
effectiveness  of such  Shelf  Registration  for up to  fifteen  (15)  days,  as
appropriate (a "Suspension Period"), by giving notice to each Purchaser,  if the
Company  shall have  determined,  in good faith  through  action by its Board of
Directors,  that the Company may be required to disclose any material  corporate
development, which disclosure, in the good faith judgment of the Company's Board
of Directors,  could reasonably be expected to have a material adverse effect on
the Company;  and at least two (2) business days prior to implementing  any such
Suspension  Period, the Company shall deliver to each Purchaser a certificate to
that effect.  Notwithstanding the foregoing, no more than two Suspension Periods
(i.e.,  30 days) may occur in  immediate  succession  and no more than three (3)
Suspension  Periods  may  occur in any  calendar  year.  The  period of any such
suspension of the  registration  statement  shall be added to the period of time
the  Company  agrees to keep the Shelf  Registration  effective  as  provided in
Section 7.2(b). The Company shall use its best efforts to limit the duration and
number of any Suspension Periods, including,  without limitation,  preparing and
filing with the SEC post-effective  amendments to the Shelf Registration  and/or
prospectus  supplements  to the prospectus  included in the Shelf  Registration.
Each  Purchaser  agrees  that,  upon  receipt  of notice  from the  Company of a
Suspension Period in accordance with the provisions of this Section 7.2(c), such
Purchaser  shall  forthwith  discontinue  disposition  of shares covered by such
registration  statement or prospectus in accordance  with the provisions of this
Section  7.2(c)  until such  Purchaser  (i) is advised in writing by the Company
that the  applicable  Suspension  Period has been  terminated and the use of the
prospectus may be resumed, (ii) has received copies of a supplemental or amended
prospectus,  if applicable,  and (iii) has received  copies of any additional or
supplemental  filings which are  incorporated  or deemed to be  incorporated  by
reference in such prospectus.

                  (d)   Registration   Expenses.   The  Company  shall  pay  all
Registration  Expenses (as defined below) in connection  with any  registration,
qualification or compliance hereunder,  and each Purchaser shall pay all Selling
Expenses  (as  defined  below)  and  other  expenses  that are not  Registration
Expenses  relating  to  the  Shares  resold  by  such  Purchaser.  "Registration
Expenses" shall mean all expenses, except for Selling Expenses,  incurred by the
Company  in  complying  with  the  registration   provisions  herein  described,
including, without limitation, all registration,  qualification and filing fees,
printing expenses, escrow fees, fees and expenses in connection with listing the
Shares for  quotation on Nasdaq NMS, fees and  disbursements  of counsel for and
the  independent  auditors of the  Company,  blue sky fees and  expenses and the
expense of any special audits incident to or required by any such  registration.
"Selling Expenses" shall mean selling  commissions,  underwriting fees and stock
transfer  taxes  applicable  to the  Shares  and all fees and  disbursements  of
counsel for any Purchaser.

                  (e) In addition to the Company's other  obligations under this
Section  7.2, in  connection  with the  registration  of the Shares on the Shelf
Registration, the Company shall:

                           (i) (A) Prior to the filing with the SEC of the Shelf
Registration  (including  any  amendments  thereto),  provide  draft  copies and
reflect in such  documents all such comments as the  Purchasers  reasonably  may
propose and (B) furnish to each Purchaser whose Shares are included in the Shelf
Registration  (x) promptly after the same is prepared and publicly  distributed,
filed  with  the  SEC,  or  received  by the  Company,  one  copy  of the  Shelf
Registration, each prospectus, and each amendment or supplement thereto, and (y)
such  number of copies of the  prospectus  and all  amendments  and  supplements
thereto,  as such  Purchaser may  reasonably  request in order to facilitate the
disposition of the Shares owned by such Purchaser;

                                       10

<PAGE>

                           (ii) As promptly as practicable  after becoming aware
of such event, notify each Purchaser of the occurrence of any event, as a result
of which the prospectus included in the Shelf  Registration,  as then in effect,
includes  an untrue  statement  of a material  fact or omits to state a material
fact required to be stated therein or necessary to make the statements  therein,
in light of the  circumstances  under which they were made, not misleading,  and
promptly  prepare an amendment to the Shelf  Registration  and supplement to the
prospectus to correct such untrue statement or omission, and deliver a number of
copies of such  supplement and amendment to each Purchaser as such Purchaser may
reasonably request;

                           (iii) As promptly as practicable after becoming aware
of such event, notify each Purchaser who holds Shares being sold of the issuance
by the SEC of any stop order or other  suspension  of the  effectiveness  of the
Shelf  Registration at the earliest  possible time and take all lawful action to
effect  the  withdrawal,  recession  or  removal  of such  stop  order  or other
suspension; and

                           (iv) Make generally available to its security holders
as soon as practicable,  but in any event not later than 18 months after (i) the
effective date (as defined in Rule 158(c) under the Securities Act) of the Shelf
Registration,  and (ii) the effective date of each  post-effective  amendment to
the Shelf Registration, as the case may be, an earnings statement of the Company
and its subsidiaries  complying with Section 11(a) of the Securities Act and the
rules and regulations of the Commission thereunder (including,  at the option of
the Company, Rule 158).

                  (f) With a view to  making  available  to the  Purchasers  the
benefits of Rule 144  promulgated  under the Securities Act ("Rule 144") and any
other rule or  regulation  of the SEC that may at any time permit a Purchaser to
sell Shares to the public without registration or pursuant to registration,  the
Company covenants and agrees to: (i) make and keep public information available,
as those terms are  understood and defined in Rule 144, until the earlier of (A)
the second anniversary of the Closing Date or (B) such date as all of the Shares
shall have been  resold;  (ii) file with the SEC in a timely  manner all reports
and other  documents  required of the Company  under the Exchange Act; and (iii)
furnish to any Purchaser upon request, as long as the Purchaser owns any Shares,
(A) a written  statement by the Company that it has complied  with the reporting
requirements  of the  Exchange  Act,  (B) a copy of the most  recent  annual  or
quarterly  report  of the  Company,  and (C) such  other  information  as may be
reasonably  requested in order to avail any  Purchaser of any rule or regulation
of the SEC that permits the selling of any such Shares without registration.

                  (g) Prior to the Effective  Date,  the Company shall not enter
into any  agreement  or take any action with respect to its  securities  that is
inconsistent  with the rights granted to the Purchasers  under this Section 7.2,
could  reasonably  be  expected  to cause a delay of the Filing  Date and/or the
Effective Date or would  otherwise  conflict with the provisions of this Section
7.2.

         7.3      Indemnification and Contribution.

                  (a) The Company  agrees to indemnify  and hold  harmless  each
Purchaser  from and against  any  losses,  claims,  damages or  liabilities  (or
actions or  proceedings  in respect  thereof) to which such Purchaser may become
subject (under the Securities Act or otherwise) insofar as such losses,  claims,
damages or liabilities (or actions or proceedings in respect  thereof) arise out
of, or are based upon,  any untrue  statement or alleged  untrue  statement of a
material fact contained in the Shelf  Registration or the prospectus  (including
any  supplement)  contained  therein  or arise out of, or are  based  upon,  the
omission or alleged  omission to state  therein a material  fact  required to be
stated  therein or  necessary  to make the  statements  therein (in light of the
circumstances  under  which they were made in the case of the  prospectus),  not
misleading,  or  arise  out of  any  failure  by  the  Company  to  fulfill  any
undertaking  included  in the  Shelf  Registration,  and the  Company  will,  as
incurred,  reimburse such  Purchaser for any legal or other expenses  reasonably
incurred in  investigating,  defending  or  preparing to defend any such action,
proceeding or claim; provided,  however, that the Company shall not be liable in
any such case to the extent that such loss,  claim,  damage or liability  arises
out of, or is based upon (i) an untrue statement made in such Shelf Registration
in reliance upon and in  conformity  with written  information  furnished to the
Company by or on behalf of such Purchaser specifically for use in preparation of
the Shelf  Registration,  (ii) the failure of such  Purchaser to comply with the
covenants and  agreements  contained in Section 7.2 or 8.3 hereof,  or (iii) any
untrue  statement  in  any  prospectus  that  is  corrected  in  any  subsequent
prospectus  that was delivered to the Purchaser  prior to the pertinent  sale or
sales by the Purchaser.  The Company will reimburse the Purchasers for any legal
or other expenses reasonably  incurred in investigating,  defending or preparing
to defend any such action,  proceeding or claim notwithstanding the absence of a
judicial determination as to the propriety and enforceability of the obligations
under this section and the possibility that such payments might later be held to
be improper, provided, that (i) to the extent

                                       11

<PAGE>

any such payment is ultimately held to be improper,  the persons  receiving such
payments shall  promptly  refund them and (ii) such persons shall provide to the
Company,  upon  request,  reasonable  assurances  of their ability to effect any
refund, when and if due.

                  (b) Each  Purchaser,  severally  and not  jointly,  agrees  to
indemnify  and hold  harmless the Company  from and against any losses,  claims,
damages or liabilities  (or actions or proceedings in respect  thereof) to which
the Company may become subject  (under the Securities Act or otherwise)  insofar
as such losses,  claims,  damages or  liabilities  (or actions or proceedings in
respect thereof) arise out of, or are based upon any untrue statement or alleged
untrue  statement of a material fact contained in the Shelf  Registration or the
prospectus  (including any supplement) contained therein or arise out of, or are
based upon,  the omission or alleged  omission to state  therein a material fact
required to be stated  therein or necessary to make the  statements  therein (in
light  of the  circumstances  under  which  they  were  made in the  case of the
prospectus),  not  misleading,  in each  case,  to the  extent,  but only to the
extent,  that such untrue  statement or alleged untrue  statement or omission or
alleged  omission  was made in  reliance  upon and in  conformity  with  written
information  furnished  to  the  Company  by  or on  behalf  of  such  Purchaser
specifically  for  use in  preparation  of  the  Shelf  Registration,  provided,
however,  that no Purchaser  shall be liable in any such case for (i) any untrue
statement  included in any prospectus  which  statement has been  corrected,  in
writing,  by such  Purchaser and  delivered to the Company  before the sale from
which such loss occurred,  (ii) the failure of such Purchaser to comply with the
covenants and  agreements  contained in Section 7.2 or 8.3 hereof,  or (iii) any
untrue  statement  in  any  prospectus  that  is  corrected  in  any  subsequent
prospectus  that was delivered to the Purchaser  prior to the pertinent  sale or
sales by the Purchaser; provided further, that the obligations of each Purchaser
hereunder  shall be  limited  to an  amount  equal to the net  proceeds  to such
Purchaser  of Shares  sold  under the Shelf  Registration.  The  Purchaser  will
reimburse  the Company for any legal or other  expenses  reasonably  incurred in
investigating,  defending or preparing to defend any such action,  proceeding or
claim  notwithstanding  the  absence  of a  judicial  determination  as  to  the
propriety  and  enforceability  of the  obligations  under this  section and the
possibility  that such  payments  might later be held to be improper,  provided,
that (i) to the extent any such payment is ultimately  held to be improper,  the
persons receiving such payments shall promptly refund them and (ii) such persons
shall provide to the  Purchaser,  upon request,  reasonable  assurances of their
ability to effect any refund, when and if due.

                  (c)  Promptly  after  receipt by any  indemnified  person of a
notice of a claim or the  beginning of any action in respect of which  indemnity
is to be sought  against an  indemnifying  person  pursuant to this Section 7.3,
such indemnified person shall notify the indemnifying  person in writing of such
claim or of the  commencement  of such action (but the omission to so notify the
indemnifying party shall not relieve it from any liability that it otherwise may
have to the indemnified party,  except to the extent that the indemnifying party
is materially  prejudiced and forfeits substantive rights and defenses by reason
of such failure), and, subject to the provisions hereinafter stated, in case any
such action shall be brought against an indemnified  person and the indemnifying
person  shall have been  notified  thereof,  the  indemnifying  person  shall be
entitled to participate therein,  and, in the case of any claim as to which both
the indemnified party and the indemnifying party are parties, to the extent that
it shall  wish,  the  indemnifying  party may assume the defense  thereof,  with
counsel reasonably satisfactory to the indemnified person. After notice from the
indemnifying  person to such  indemnified  person of the  indemnifying  person's
election to assume the defense  thereof,  the  indemnifying  person shall not be
liable to such indemnified person for any legal expenses  subsequently  incurred
by such  indemnified  person in connection with the defense  thereof;  provided,
however,  that if there exists or shall exist a conflict of interest  that would
make it inappropriate in the reasonable  judgment of the indemnified  person for
the same counsel to represent both the indemnified  person and such indemnifying
person or any affiliate or associate  thereof,  the indemnified  person shall be
entitled to retain its own counsel at the expense of such  indemnifying  person.
If the  indemnifying  party shall assume the defense of any such claim, it shall
not, without prior written consent of the indemnified party (which consent shall
not unreasonably be withheld), settle or compromise any such claim or consent to
the entry of any judgment that does not include an unconditional  release of the
indemnified party from all liabilities with respect to such claim or judgment.

                  (d) If the indemnification provided for in this Section 7.3 is
unavailable  to or  insufficient  to hold  harmless an  indemnified  party under
subsection  (a) or (b)  above in  respect  of any  losses,  claims,  damages  or
liabilities (or actions or proceedings in respect thereof)  referred to therein,
then each  indemnifying  party shall contribute to the amount paid or payable by
such indemnified party as result of such losses,  claims, damages or liabilities
(or actions in respect  thereof) in such proportion as is appropriate to reflect
the  relative  fault of the  Company on the one hand and the  Purchasers  on the
other in  connection  with the  statements or omissions  which  resulted in such
losses,  claims, damages or liabilities (or actions in respect thereof), as well
as any other  relevant  equitable  considerations.  The relative  fault shall be
determined by reference to, among other things, whether the

                                       12

<PAGE>

untrue or alleged untrue statement of a material fact or the omission or alleged
omission to state a material fact relates to information supplied by the Company
on the one hand or a Purchaser  on the other and the parties'  relative  intent,
knowledge,  access to  information  and  opportunity  to correct or prevent such
statement or omission. The Company and the Purchasers agree that it would not be
just  and  equitable  if  contribution  pursuant  to this  subsection  (d)  were
determined by pro rata  allocation  (even if the Purchasers  were treated as one
entity for such  purpose) or by any other  method of  allocation  which does not
take  account  of  the  equitable  considerations  referred  to  above  in  this
subsection  (d). The amount paid or payable by an indemnified  party as a result
of the losses,  claims,  damages, or liabilities (or actions in respect thereof)
referred to above in this subsection (d) shall be deemed to include any legal or
other expenses  reasonably incurred by such indemnified party in connection with
investigating  or  defending  any such  action  or  claim.  Notwithstanding  the
provisions of this  subsection (d), no Purchaser shall be required to contribute
any amount in excess of the amount by which the amount received by the Purchaser
from the sale of the Shares to which such loss relates exceeds the amount of any
damages which such  Purchaser  has  otherwise  been required to pay by reason of
such untrue or alleged  untrue  statement  or omission or alleged  omission.  No
person  guilty of  fraudulent  misrepresentation  (within the meaning of Section
11(f) of the Securities Act) shall be entitled to  contribution  from any person
who was  not  guilty  of  such  fraudulent  misrepresentation.  The  Purchasers'
obligations  in this  subsection  (d) to contribute are several in proportion to
their respective sales of Shares to which such loss relates and not joint.

                  (e) The  obligations of the Company and the  Purchasers  under
this Section 7.3 shall be in addition to any liability which the Company and the
respective  Purchasers may otherwise have and shall extend,  upon the same terms
and  conditions,  to each  person,  if any,  who  controls  the  Company  or any
Purchaser within the meaning of the Act.

         7.4 Key Person Insurance. As soon as practicable after the Closing Date
and in any event  within sixty (60) days of the Closing  Date,  the Company will
obtain  key-person  life  insurance  in the amount of  $1,500,000  on Sam Eletr,
Ph.D.,  for a period of three (3) years from the  Closing  Date,  with  proceeds
payable to the Company.


         7.5 Board  Representation.  For a period  of three  (3) years  from the
Closing  Date, so long as WPG- Farber,  Weber Fund,  L.P.  ("WPG Farber  Weber")
holds at least 400,000 shares of Common Stock of the Company, the Company agrees
to nominate a designee of WPG Farber Weber reasonably  acceptable to the Company
(the  "Nominee"),  for election to the Board of Directors of the Company at each
meeting of the Company's  stockholders,  or pursuant to each written  consent of
the Company's stockholders, held or solicited for the purpose of the election of
directors  of the  Company.  If WPG Farber  Weber  elects not to have a designee
nominated  to the  Company's  Board of  Directors,  WPG  Farber  Weber  shall be
entitled to have one  representative  as an observer  (with no right to vote) at
each  meeting  of the  Board  of  Directors  of the  Company,  and the  Board of
Directors of the Company  shall  furnish (or cause to be  furnished)  WPG Farber
Weber,  to the attention of such person as WPG Farber Weber may designate as its
observer (the "Observer"), and at the same time and in the same manner furnished
to directors of the Company, notice of each such meeting and any other materials
relevant to such meeting so provided to the directors of the Company  (including
resolutions  to be  adopted  by the  directors  at  any  meeting  or by  written
consent);  provided, however, that (i) such Observer acknowledges that he or she
will have access to confidential,  nonpublic, material, insider information, and
(ii) such  Observer  may be excluded  from  portions of meetings of the Board of
Directors of the Company if Company's  Counsel  determines  that such Observer's
presence could jeopardize the attorney-client privilege.

         7.6 Nasdaq NMS Listing.  The Company shall use its best efforts as soon
as  practicable  after the  Closing  Date,  and in any  event no later  than the
Effective  Date,  to cause the Common  Stock to be listed for  inclusion  on the
Nasdaq NMS and shall take all  actions  necessary  to comply  with the rules and
regulations  of the Nasdaq NMS in order to maintain the  inclusion of the Common
Stock on the Nasdaq NMS.

SECTION 8 RESTRICTIONS ON TRANSFERABILITY OF SHARES:  COMPLIANCE WITH SECURITIES
          ACT

         8.1   Restrictions  on   Transferability.   The  Shares  shall  not  be
transferable  in the absence of a  registration  under the  Securities Act or an
exemption  therefrom  or in the  absence  of  compliance  with  any term of this
Agreement.  The Company shall be entitled to give stop transfer  instructions to
its transfer  agent with respect to the Shares in order to enforce the foregoing
restrictions.

         8.2 Restrictive Legend. Each certificate representing Shares shall bear
substantially  the following  legends (in addition to any legends required under
applicable securities laws):

                                       13

<PAGE>

         THE SHARES  REPRESENTED  BY THIS  CERTIFICATE  HAVE BEEN  ACQUIRED  FOR
         INVESTMENT  PURPOSES  ONLY  AND  HAVE NOT  BEEN  REGISTERED  UNDER  THE
         SECURITIES ACT OF 1933 OR ANY STATE SECURITIES LAWS. THE SHARES MAY NOT
         BE SOLD OR  TRANSFERRED  IN THE  ABSENCE  OF  SUCH  REGISTRATION  OR AN
         EXEMPTION THEREFROM.

         ADDITIONALLY,   THE  TRANSFER  OF  THE  SHARES   REPRESENTED   BY  THIS
         CERTIFICATE IS SUBJECT TO CERTAIN RESTRICTIONS  SPECIFIED IN THE COMMON
         STOCK PURCHASE  AGREEMENT  DATED SEPTEMBER __, 1997 BETWEEN THE COMPANY
         AND THE ORIGINAL PURCHASER, AND NO TRANSFER OF SHARES SHALL BE VALID OR
         EFFECTIVE  ABSENT  COMPLIANCE  WITH SUCH  RESTRICTIONS.  ALL SUBSEQUENT
         HOLDERS OF THIS  CERTIFICATE WILL HAVE AGREED TO BE BOUND BY CERTAIN OF
         THE  TERMS  OF THE  AGREEMENT,  INCLUDING  SECTIONS  4.4 AND 8.3 OF THE
         AGREEMENT.  COPIES  OF THE  AGREEMENT  MAY BE  OBTAINED  AT NO  COST BY
         WRITTEN  REQUEST MADE BY THE REGISTERED  HOLDER OF THIS  CERTIFICATE TO
         THE SECRETARY OF THE COMPANY.

         8.3  Transfer  of Shares  after  Registration.  Each  Purchaser  hereby
covenants  with the Company not to make any sale of the Shares except either (i)
in accordance with the Shelf Registration,  in which case Purchaser covenants to
comply with the  requirement  of  delivering  a current  prospectus,  or (ii) in
accordance with Rule 144, in which case Purchaser  covenants to comply with Rule
144.  Purchaser  further  acknowledges  and  agrees  that  such  Shares  are not
transferable on the books of the Company unless the certificate submitted to the
Company's  transfer  agent  evidencing  such Shares is accompanied by a separate
certificate  executed by an officer of, or other person duly  authorized by, the
Purchaser in the form attached hereto as Exhibit C.

         8.4  Purchaser  Information.  Each  Purchaser  covenants  that  it will
promptly  notify the  Company in writing of any changes in the  information  set
forth in the Shelf  Registration  regarding such  Purchaser or such  Purchaser's
"Plan of Distribution."

SECTION 9         PREEMPTIVE RIGHTS

         9.1 Preemptive Right.  Except as set forth below, if, at any time prior
to the  expiration  of the period set forth in Section  9.7 below,  the  Company
should desire to issue any Equity  Securities (as defined below),  it shall give
each  Purchaser  the first  right to  purchase  its Pro Rata  Share (as  defined
below),  or any part thereof,  of all of such offered  Equity  Securities on the
same terms as the Company is willing to sell such Equity Securities to any other
person.  The  Purchaser's  "Pro Rata Share" of such Equity  Securities  shall be
equal  to the  percentage  of the  outstanding  Equity  Securities  held  by the
Purchaser  on the date of the  Company's  written  notification  referred  to in
Section 9.2 below, assuming for purposes of such calculation (i) that all Equity
Securities  reserved under the Company's  equity incentive plans for issuance to
employees,  officers and  directors  of, and  consultants  to, the Company,  are
issued  and  outstanding,  and (ii) that all  Equity  Securities  issuable  upon
exercise of options,  warrants or convertible securities existing as of the date
hereof are issued and outstanding.

         9.2  Notification.  Prior to any sale or issuance by the Company of any
Equity Securities,  the Company shall notify each Purchaser,  in writing, of its
intention to sell and issue such securities,  setting forth in reasonable detail
the terms under which it  proposes  to make such sale.  Within  twenty (20) days
after  notice,  the  Purchaser  shall notify the Company  whether the  Purchaser
exercises  its  option and  elects to  purchase  its Pro Rata Share (or any part
thereof) of the Equity Securities so offered.

         9.3 Issuance;  Preemptive  Rights  Waived or Lapsed.  If, within twenty
(20) days after the Company  gives its aforesaid  notice the Purchaser  does not
notify the Company  that the  Purchaser  desires to purchase all of its Pro Rata
Share of the  Equity  Securities  described  in such  notice  upon the terms and
conditions set forth in such notice,  or notifies the Company that it desires to
purchase less than all of its Pro Rata Share,  the Company may,  during a period
of ninety (90) days following the end of such 20-day period, sell and issue such
securities as to which the  Purchaser  does not indicate a desire to purchase to
another  person upon the same general terms and conditions as those set forth in
the  notice  to the  Purchaser,  but at a price at  least as great as the  price
offered to the  Purchaser;  provided,  that failure by the Purchaser to exercise
its option to purchase with respect to one offering, sale and issuance shall not
affect its option to purchase Equity Securities in any subsequent offering, sale
and  purchase.  In the event the Company has not sold the Equity  Securities  or
entered  into an  agreement  to sell the Equity  Securities  within  said 90-day
period,  the Company shall not  thereafter  issue or sell any Equity  Securities
without first offering such  securities to the Purchaser in the manner  provided
above.

                                       14

<PAGE>

         9.4 Issuance;  Preemptive  Rights  Exercised.  If a Purchaser gives the
Company  notice  that  the  Purchaser  desires  to  purchase  any of the  Equity
Securities offered by the Company, payment for the Equity Securities shall be by
check or wire  transfer,  against  delivery of the  securities  at the executive
offices  of the  Company  within ten (10) days after  giving  the  Company  such
notice,  or, if later,  the closing date for the sale by the Company of all such
Equity Securities proposed to be sold. The Company shall take all such action as
may be required by any regulatory  authority in connection  with the exercise by
the  Purchaser of the right to purchase  Equity  Securities as set forth in this
Section 9.

         9.5  Excluded  Securities.  The  preemptive  rights  contained  in this
Section 9 shall not apply to (a) the  granting  of  options to  purchase  Common
Stock or  issuance  by the  Company  of  Common  Stock to  employees,  officers,
directors  or  consultants  of the Company  under stock option plans or purchase
agreements or other  purchase  arrangements  approved by the Company's  Board of
Directors including,  without limitation,  the PZ&C Warrant, (b) the issuance of
Equity  Securities in connection with the acquisition of a third party by merger
or acquisition of more than fifty-one percent (51%) of the outstanding shares or
substantially  all of the assets of such third  party on terms  approved  by the
Company's  Board  of  Directors,  (c)  the  issuance  of  Equity  Securities  in
connection with venture  leasing  transactions or issued to the seller or lessor
of equipment in equipment purchase and lease transactions  approved by the Board
of Directors,  (d) the issuance of Equity Securities pursuant to the exercise of
options,  warrants or convertible  securities outstanding as of the date hereof,
(e) the issuance of Equity Securities in connection with any stock split,  stock
dividend  or  recapitalization  of the  Company,  (f)  the  issuance  of  Equity
Securities offered generally to the public pursuant to a registration  statement
(including  any such  issuance of rights to purchase  capital  stock  offered to
stockholders or  optionholders  of the Company at such time) or (g) the issuance
of Common  Stock of the  Company  upon  conversion  or  exercise  of any  Equity
Security  which  was not  subject  to the  preemptive  rights  set forth in this
Section 9 or for which the preemptive rights were not exercised.

         9.6 Assignment.  A Purchaser's  right to purchase any Equity Securities
pursuant  to this  Section 9 may not be assigned  by the  Purchaser  without the
prior written consent of the Company.

         9.7  Termination.  All rights  and  duties set forth in this  Section 9
shall  terminate  upon  the  first  to  occur  of (i)  June  30,  2002  or  (ii)
consummation of the IPO (as defined below).

         9.8 Waiver. Any term of this Section 9 may be amended or waived (either
generally   or  in  a   particular   instance   and  either   retroactively   or
prospectively),  only with the  written  consent of the Company and holders of a
majority of the outstanding Shares.

         9.9      Definitions.      For purposes of this Section 9:

                  (a)  "Equity  Securities"  means (i)  Common  Stock,  Series B
Preferred Stock,  Series C Preferred Stock, Series D Preferred Stock and rights,
options or warrants to purchase Common Stock, Series B Preferred Stock, Series C
Preferred  Stock or Series D Preferred  Stock,  (ii) any security of the Company
having voting rights in the election of the Board of Directors,  not  contingent
upon a failure to pay dividends,  (iii) any security of the Company  convertible
into or  exchangeable  for any of the  foregoing,  and  (iv)  any  agreement  or
commitment to issue any of the foregoing. All references to a certain percentage
of the outstanding  Equity  Securities  shall be calculated on an  as-converted,
as-exercised basis.

                  (b) "IPO" means the first firmly  underwritten public offering
of Common  Stock of the Company  that is pursuant  to a  registration  statement
filed  with,  and  declared  effective  by,  the SEC under the  Securities  Act,
covering the offer and sale of the Company's Common Stock to the public.

SECTION 10        MISCELLANEOUS

         10.1  Waivers and  Amendments.  With the  exception of Sections 7 and 9
hereof,  the terms of this  Agreement  may be waived or amended with the written
consent of the  Company  and each  Purchaser.  With  respect to Sections 7 and 9
hereof,  with the written  consent of the Company and the record holders of more
than fifty percent (50%) of the Shares then  outstanding and held by Purchasers,
the terms of the  Agreement  may be waived or amended and any such  amendment or
waiver shall be binding upon the Company and all holders of Shares.  No delay or
omission to exercise any right,  power or remedy  accruing to a Purchaser,  upon
any breach or default of the Company under this Agreement, shall impair any such
right, power or remedy of the Purchaser nor shall it be construed to be a waiver
or any such  breach or  default,  or an  acquiescence  therein,  or of or in any
similar  breach or  default  thereafter  occurring;  nor shall any waiver of any
single breach or default be deemed a waiver of any other

                                       15

<PAGE>

breach or default  theretofore  or  thereafter  occurring.  Any waiver,  permit,
consent or approval of any kind or character on the part of the Purchaser of any
breach  or  default  under  this  Agreement,  or any  waiver  on the part of the
Purchaser of any provisions or conditions of this Agreement,  must be in writing
and  shall  be  effective  only to the  extent  specifically  set  forth in such
writing.

         10.2 Broker's Fee. Each of the parties hereto hereby  represents  that,
on the basis of any actions and  agreements by it, there are no other brokers or
finders  entitled to  compensation  of any kind or nature in connection with the
sale of the  Shares  to the  Purchasers,  except  for  the fee to be paid  and a
warrant for up to 75,000  shares of Common  Stock to be issued by the Company to
Punk, Ziegel & Company.

         10.3 Governing Law. This Agreement shall be governed in all respects by
and construed in accordance with the laws of the State of California without any
regard to conflicts of laws principles.

         10.4     Survival.

                  (a) The representations,  warranties, covenants and agreements
made in this Agreement  shall survive any  investigation  made by the Company or
the Purchasers and the closing of the transactions contemplated hereby.

                  (b) The Company shall  indemnify and hold harmless each of the
Purchasers against and from all liability, demands, claims, actions or causes of
action, assessments,  losses, penalties,  costs, damages or expenses,  including
all reasonable  attorneys' and expert witness fees, sustained or incurred by any
such Purchaser and its successors or assigns:

                           (i) as a result of or arising  out of or by virtue of
any incorrect  representation  or warranty made by the Company to the Purchasers
herein or in any closing  document  delivered to the  Purchasers  in  connection
herewith; or

                           (ii) as a result of or arising out of or by virtue of
the failure of the Company to comply with,  or the breach by the Company of, any
of the  covenants of this  Agreement  to be performed by the Company  under this
Agreement.

                  (c) Each Purchaser, severally and not jointly, shall indemnify
and hold harmless the Company against and from all liability,  demands,  claims,
actions or causes of action,  assessments,  losses, penalties, costs, damages or
expenses, including all reasonable attorneys' and expert witness fees, sustained
or incurred by the Company and its successors or assigns:

                           (i) as a result of or arising  out of or by virtue of
any incorrect  representation  or warranty made by such Purchaser to the Company
herein or in any closing document  delivered by such Purchaser to the Company in
connection herewith; or

                           (ii) as a result of or arising out of or by virtue of
the failure of such  Purchaser to comply with,  or the breach by such  Purchaser
of, any of the  covenants of this  Agreement  to be performed by such  Purchaser
under this Agreement.

         10.5     Successors and Assigns.

                  (a) The  provisions  hereof shall inure to the benefit of, and
be binding upon, the successors, assigns, heirs, executors and administrators of
the  parties to this  Agreement.  Notwithstanding  the  foregoing,  prior to the
Effective  Date no  Purchaser  shall  assign  this  Agreement  without the prior
written consent of the Company. The Company shall not have the right to delegate
or assign its  obligations  hereunder  without the prior written  consent of the
record  holders of more than fifty percent (50%) of the Shares then  outstanding
and held by the Purchasers.

         10.6 Entire Agreement. This Agreement and the other documents delivered
pursuant  hereto  constitute  the full and entire  understanding  and  agreement
between the parties with regard to the subjects hereof and thereof.

         10.7  Notices,  etc. All notices and other  communications  required or
permitted  under this Agreement  shall be effective upon receipt and shall be in
writing and may be delivered in person, by telecopy,  overnight delivery service
or registered or certified  United States mail,  addressed to the Company or the
Purchasers, as the

                                       16

<PAGE>

case may be, at their  respective  addresses  set forth at the beginning of this
Agreement  or on  Exhibit  A, or at such  other  address  as the  Company or the
Purchasers  shall have furnished to the other party in writing.  All notices and
other  communications  shall be  effective  upon the  earlier of actual  receipt
thereof by the person to whom  notice is  directed or (i) in the case of notices
and communications sent by personal delivery or telecopy, one business day after
such  notice  or  communication   arrives  at  the  applicable  address  or  was
successfully sent to the applicable telecopy number, (ii) in the case of notices
and communications  sent by overnight delivery service,  at noon (local time) on
the second business day following the day such notice or communication was sent,
and (iii) in the case of notices and communications  sent by United States mail,
seven days after such notice or  communication  shall have been deposited in the
United States mail.

         10.8 Severability of this Agreement. If any provision of this Agreement
shall be judicially  determined  to be invalid,  illegal or  unenforceable,  the
validity,  legality and enforceability of the remaining  provisions shall not in
any way be affected or impaired thereby.

         10.9  Counterparts.  This  Agreement  may be  executed in any number of
counterparts,  each of which  shall be an  original,  but all of which  together
shall constitute one instrument.

         10.10 Further  Assurances.  Each party to this  Agreement  shall do and
perform or cause to be done and  performed  all such further acts and things and
shall execute and deliver all such other agreements,  certificates,  instruments
and documents as the other party hereto may reasonably request in order to carry
out  the  intent  and   accomplish  the  purposes  of  this  Agreement  and  the
consummation of the transactions contemplated hereby.

         10.11 Expenses.  The Company and each such Purchaser shall bear its own
expenses  incurred  on its  behalf  with  respect  to  this  Agreement  and  the
transactions  contemplated  hereby,  including fees of legal counsel;  provided,
however,  that the Company shall pay to WPG Farber Weber as soon as  practicable
after the Closing Date,  the reasonable  actual legal fees and expenses,  not to
exceed $25,000, for one legal counsel to the Purchasers.

         10.12   Announcements.   The  parties  hereto  agree  that  all  public
announcements regarding the transactions contemplated by this Agreement shall be
approved in advance by the Company and WPG Farber Weber; provided,  however that
neither party will be precluded hereby from making such disclosures as it may be
required  to make in  order  to  comply  with  all  applicable  laws or  listing
agreements.

                                       17

<PAGE>

         The foregoing  agreement is hereby  executed as of the date first above
written.

                                        "COMPANY"

                                        LYNX THERAPEUTICS, INC.
                                           a Delaware corporation


                                        By:_____________________________________
                                             Sam Eletr
                                             Chief Executive Officer


<PAGE>

<TABLE>
                                    EXHIBIT A

                              SCHEDULE OF INVESTORS

<CAPTION>
Investor Name                                                          Shares                        Purchase
                                                                       Purchased                     Price


<S>                                                                    <C>                           <C>       
WPG-Farber, Weber Fund, L.P.                                           459,000                       $4,590,000
David Present
590 Madison Avenue
27th Floor
New York, NY  10022
212/857-3402
212/421-0418 (Fax)

WPG-Farber, Weber Overseas, L.P.                                       22,500                        $225,000
Daivd Present
590 Madison Avenue
27th Floor
New York, NY  10022
212/857-3402
212/421-0418 (Fax)

Star Creation Ltd.                                                     18,500                        $185,000
David Present
590 Madison Avenue
27th Floor
New York, NY  10022
212/857-3402
212/421-0418 (Fax)

Lombard Odier Zuerich Ltd.                                             400,000                       $4,000,000
Daniel Richner, Ph.D.
Todistrasse 36
8027 Zuerich
411/287-1788
411/287-1714 (Fax)

Four Partners                                                          360,000                       $3,600,000
Barry Bloom
Tisch Financial Management
655 Madison Avenue
New York, NY  10021
212/521-2930
212/521-2983 (Fax)

FBB Associates                                                         40,000                        $400,000
Julian Baker
667 Madison Avenue
New York, NY  10021
212/545-3034
212/545-2915 (Fax)

INVESCO Global Health Sciences Fund                                    350,000                       $3,500,000
c/o INVESCO Trust Company
Buck Phillips
7800 East Union Avenue
Denver, CO  80237
303/930-6521
303/930-2423 (Fax)

                                       22

<PAGE>
Investor Name                                                          Shares                        Purchase
                                                                       Purchased                     Price


H&Q Healthcare Investors                                               150,000                       $1,500,000
Paul A. Howard
50 Rowes Wharf
Boston, MA 02110-3328
617/574-0564
617/574-0562 (Fax)

H&Q Life Sciences Investors                                            100,000                       $1,000,000
Paul A. Howard
50 Rowes Wharf
Boston, MA 02110-3328
617/574-0564
617/574-0562 (Fax)

BioCentive Limited                                                     150,000                       $1,500,000
c/o Winchester
Williams House
20 Reid Street
Hamilton HMPX, Bermuda
441/296-2000
441/296-1199 (Fax)
c/o Mehta and Isaly
Contact: Joel Mesznik
122 East 42nd Street, 49th Floor
New York, NY 10168
212/949-0707
212/949-6203 (Fax)

PHARMA/wHEALTH                                                         150,000                       $1,500,000
Mehta and Isaly
Samuel Isaly
Carl Gordon
41 Madison Avenue, 40th Floor
New York, NY  10010-2202
212/685-0800
212/685-1084 (Fax)

Caduceus Capital, Ltd.                                                 110,000                       $1,100,000
Mehta and Isaly
Samuel Isaly
Carl Gordon
41 Madison Avenue, 40th Floor
New York, NY  10010-2202
212/685-0800
212/685-1084 (Fax)

Caduceus Capital, L.P.                                                 40,000                        $400,000
Mehta and Isaly
Samuel Isaly
Carl Gordon
41 Madison Avenue, 40th Floor
New York, NY  10010-2202
212/685-0800
212/685-1084 (Fax)

                                       23

<PAGE>
Investor Name                                                          Shares                        Purchase
                                                                       Purchased                     Price


Axa U.S. Growth Fund LLC                                               57,500                        $575,000
Partech International
Thomas G. McKinley
50 California Street
Suite 3200
San Francisco, CA  94111
415/788-2929
415/788-6763 (Fax)

Parvest U.S. Partners II C.V.                                          20,000                        $200,000
Partech International
Thomas G. McKinley
50 California Street
Suite 3200
San Francisco, CA  94111
415/788-2929
415/788-6763 (Fax)

U.S. Growth Fund Partners C.V.                                         20,000                        $200,000
Partech International
Thomas G. McKinley
50 California Street
Suite 3200
San Francisco, CA  94111
415/788-2929
415/788-6763 (Fax)

Double Black Diamond II LLC                                            10,000                        $100,000
Partech International
Thomas G. McKinley
50 California Street
Suite 3200
San Francisco, CA  94111
415/788-2929
415/788-6763 (Fax)

Almanori Limited                                                       2,200                         $22,000
Partech International
Thomas G. McKinley
50 California Street
Suite 3200
San Francisco, CA  94111
415/788-2929
415/788-6763 (Fax)

David Sherry                                                           2,500                         $25,000
Partech International
Thomas G. McKinley
50 California Street
Suite 3200
San Francisco, CA  94111
415/788-2929
415/788-6763

                                       24

<PAGE>
Investor Name                                                          Shares                        Purchase
                                                                       Purchased                     Price


Multinvest Limited                                                     1,300                         $13,000
Partech International
Thomas G. McKinley
50 California Street
Suite 3200
San Francisco, CA  94111
415/788-2929
415/788-6763

Partech International Salary Deferral Plan                             1,000                         $10,000
U/A Dated 1/1/92
FBO: Thomas G. McKinley
Partech International
50 California Street
Suite 3200
San Francisco, CA  94111
415/788-2929
415/788-6763 (Fax)

Partech International Salary Deferral Plan                             500                           $5,000
U/A Dated 1/1/92
FBO: Scott Matson
Partech International
50 California Street
Suite 3200
San Francisco, CA  94111
415/788-2929
415/788-6763 (Fax)

CDC - Valeurs de Croissance                                            75,000                        $750,000
Albert Miguel-Montanes
33, Avenue du Maine
BP 173
Paris 75755 Cedex 15
FRANCE
011-33 1 40 64 22 00
011-33 1 40 64 22 25 (Fax)

Punk, Ziegel & Knoell Investors LLC                                    28,000                        $280,000
Julia Gregory
520 Madison Ave., 7th Floor
New York, NY  10022
212/308-9494
212/308-2203 (Fax)

William J. Punk, Jr.                                                   5,000                         $50,000
Punk, Ziegel & Knoell Investors LLC
520 Madison Ave., 7th Floor
New York, NY  10022
212/308-9494
212/308-2203 (Fax)

Julia P. Gregory                                                       3,000                         $30,000
Punk, Ziegel & Knoell Investors LLC
520 Madison Ave., 7th Floor
New York, NY  10022
212/308-9494
212/308-2203 (Fax)

                                       25

<PAGE>
Investor Name                                                          Shares                        Purchase
                                                                       Purchased                     Price


European Medical Ventures Fund SCA                                     30,000                        $300,000
c/o FINOVELEC
Bernard Daugeras
6 Ruse Ancelle
92200 Neuilly Sur
Seine, FRANCE
011-33 1/55 61 51 56
011-33 1/46 40 79 38 (Fax)

David Bellet                                                           10,000                        $100,000
125 East 72nd Street
Apt. 11-D
New York, NY  10021
212/808-5278
212/808-9073 (Fax)

The Pidwell Family Living Trust dated 6/25/87                          5,000                         $50,000
c/o Asset Management Associates, Inc.
2275 E. Bayshore Road
Suite 150
Palo Alto, CA  94303
Contact: Tony Di Bona
650/494-7400
650/856-1826 (Fax)

Tony Di Bona                                                           1,000                         $10,000
155 South Palomar Drive
Redwood City, CA  94062-3237
650/494-7400
650/856-1826 (Fax)

Douglas E. Kelly SEP-IRA                                               1,000                         $10,000
c/o Asset Management Associates, Inc.
2275 E. Bayshore Road
Suite 150
Palo Alto, CA  94303
Contact: Tony Di Bona
650/494-7400
650/856-1826 (Fax)

Mark Platshon                                                          2,500                         $25,000
3125 Barney Avenue
Menlo Park, CA 94025
Contact: Tony Di Bona
650/494-7400
650/856-1826 (Fax)

Sam Eletr, Ph.D.                                                       50,000                        $500,000
Lynx Therapeutics, Inc.
3832 Bay Center Place
Hayward, CA 94545
510/670-9300
510/670-9303 (Fax)

                      Total                                            2,675,500                     $26,755,000

</TABLE>
                                       26

<PAGE>

                                    EXHIBIT B

                         INSTRUCTION SHEET FOR PURCHASER

                   (to be read in conjunction with the entire
                        Common Stock Purchase Agreement)

A.       Complete the following items in the Common Stock Purchase Agreement:

         1.       Provide the information  regarding the Purchaser  requested on
                  the  signature  page.  The  Agreement  must be  executed by an
                  individual authorized to bind the Purchaser.

         2.       Exhibit B-1 - Stock Certificate Questionnaire:
                  Provide the  information  requested  by the Stock  Certificate
                  Questionnaire;

         3.       Exhibit B-2 - Registration Statement Questionnaire:
                  Provide  the   information   requested  by  the   Registration
                  Statement Questionnaire.

         4.       Exhibit B-3 - Purchaser Certificate:

                  Provide  the  information  requested  by the  Certificate  for
                  Individual   Purchasers  or  the  Certificate  for  Corporate,
                  Partnership,   Trust,  Foundation  and  Joint  Purchasers,  as
                  applicable.

         5.       Return the signed  Purchase  Agreement  including the properly
                  completed Exhibit B to:

                           Punk, Ziegel & Company
                           520 Madison Avenue, 7th Floor
                           New York, NY 10022
                           Attn: Ellen Smith

B.       Instructions regarding the transfer of funds for the purchase of Shares
         will be telecopied  to the Purchaser by the Placement  Agent at a later
         date.

C.       Upon the resale of the Shares by the Purchaser  after the  Registration
         Statement  covering  the  Shares  is  effective,  as  described  in the
         Purchase Agreement, the Purchaser:

                  (i)      must  deliver a current  prospectus,  and  annual and
                           quarterly   reports  of  the  Company  to  the  buyer
                           (prospectuses,  and annual and quarterly  reports may
                           be  obtained  from  the  Company  at the  Purchaser's
                           request); and

                  (ii)     must  send a letter  in the form of  Exhibit C to the
                           Company   so  that  the   Shares   may  be   properly
                           transferred.

<PAGE>

                                   EXHIBIT B-1

                             LYNX THERAPEUTICS, INC.

                         STOCK CERTIFICATE QUESTIONNAIRE

         Pursuant to Section 4.3 of the  Agreement,  please  provide us with the
following information:

1.       The exact  name that the Shares
         are to be  registered  in (this
         is the name that will appear on
         the stock certificate(s)).  You
         may  use  a  nominee   name  if
         appropriate:
                                             ___________________________________

2.       The  relationship  between  the
         Purchaser of the Shares and the
         Registered   Holder  listed  in
         response to item 1 above:
                                             ___________________________________

3.       The  mailing   address  of  the
         Registered   Holder  listed  in
         response to item 1 above:
                                             ___________________________________
                                             ___________________________________
                                             ___________________________________
                                             ___________________________________
                                             ___________________________________

4.       The Tax  Identification  Number
         of the Registered Holder listed
         in response to item 1 above:
                                             ___________________________________

<PAGE>

                                   EXHIBIT B-2

                             LYNX THERAPEUTICS, INC.

                      REGISTRATION STATEMENT QUESTIONNAIRE


         In  connection  with the  preparation  of the  Registration  Statement,
please provide us with the following information regarding the Purchaser.

         1. Please state your organization's name exactly as it should appear in
the Registration Statement:


         2.  Have you or your  organization  had any  position,  office or other
material relationship within the past three years with the Company?

             ______    Yes               ______    No

         If yes, please indicate the nature of any such relationships below:

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

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

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

<PAGE>

                                   EXHIBIT B-3

                             LYNX THERAPEUTICS, INC.

                      CERTIFICATE FOR INDIVIDUAL PURCHASERS


         If the  investor is an  individual  Purchaser  (or married  couple) the
Purchaser must complete, date and sign this Certificate.

                                   CERTIFICATE


         I certify that the  representations  and  responses  below are true and
accurate:

         In order for the  Company to offer and sell the  Shares in  conformance
with state and  federal  securities  laws,  the  following  information  must be
obtained regarding your investor status. Please initial each category applicable
to you as an investor in the Company.

         _________         (1)  A  natural   person  whose  net  worth,   either
individually or jointly with such person's spouse exceeds $1,000,000;

         _________         (2) A natural  person  who had an income in excess of
$200,000,  or joint  income with that  person's  spouse in excess of $300,000 in
1995 and 1996, and reasonably  expects to have  individual  income  reaching the
same level in 1997;

         _________         (3) An executive officer or director of the Company.

         My principal residence is in the state of ____________________________.

Dated:   _________         _____________________________________________________
                                    Name(s) of Purchaser

                                    ____________________________________________
                                    Signature



                                    ____________________________________________
                                    Signature


<PAGE>



                                   EXHIBIT B-3

                             LYNX THERAPEUTICS, INC.

                     CERTIFICATE FOR CORPORATE, PARTNERSHIP,
                     TRUST, FOUNDATION AND JOINT PURCHASERS


         If the investor is a  corporation,  partnership,  trust,  pension plan,
foundation,  joint purchaser  (other than a married couple) or other entity,  an
authorized  officer,  partner,  or  trustee  must  complete,  date and sign this
Certificate.

                                   CERTIFICATE

         The undersigned  certifies that the representations and responses below
are true and accurate:

         (a)      The investor has been duly formed and is validly  existing and
has full power and  authority  to invest in the Company.  The person  signing on
behalf of the  undersigned  has the  authority to execute and deliver the Common
Stock  Purchase  Agreement on behalf of the  Purchaser and to take other actions
with respect thereto.

         (b)      Indicate the form of entity of the undersigned:

                  _________         Limited Partnership

                  _________         General Partnership

                  _________         Corporation

                  _________         Revocable  Trust  (identify each grantor and
                                    indicate under what  circumstances the trust
                                    is revocable by the grantor): ______________
                                    ____________________________________________
                                    ____________________________________________
                                    ____________________________________________
                                    ____________________________________________
                                    ___________________________________________.
                                    (Continue on a separate  piece of paper,  if
                                    necessary.)

                  _________         Other Type of Trust  (indicate type of trust
                                    and, for trusts  other than pension  trusts,
                                    name the grantors and beneficiaries):
                                    ____________________________________________
                                    ____________________________________________
                                    ____________________________________________
                                    ____________________________________________
                                    (Continue on a separate  piece of paper,  if
                                    necessary.)

                  _________         Other form of organization (indicate form of
                                    organization):
                                    ___________________________________________.

         (c)      Indicate the date the undersigned entity was formed:_________.

         (d)      In order  for the  Company  to offer  and sell the  Shares  in
conformance with state and federal  securities  laws, the following  information
must be obtained  regarding your investor  status.  Please initial each category
applicable to you as an investor in the Company.



                  _________  1.     A bank as defined in Section  3(a)(2) of the
                  Securities  Act, or any savings and loan  association or other
                  institution as defined in Section 3(a)(5)(A) of the Securities
                  Act whether acting in its individual or fiduciary capacity;



                  _________  2.     A broker or dealer  registered  pursuant  to
                  Section 15 of the Securities Exchange Act of 1934;

                                        1

<PAGE>

                  _________  3.     An  insurance  company as defined in Section
                  2(13) of the securities Act;

                  _________  4.     An investment  company  registered under the
                  Investment  Company  Act of  1940  or a  business  development
                  company as defined in Section 2(a)(48) of that Act;

                  _________  5.     A Small Business Investment Company licensed
                  by the U.S. Small Business Administration under Section 301(c)
                  or (d) of the Small Business Investment Act of 1958;

                  _________  6.     A  plan  established  and  maintained  by  a
                  state,   its   political   subdivisions,   or  any  agency  or
                  instrumentality of a state or its political subdivisions,  for
                  the benefit of its employees, if such plan has total assets in
                  excess of $5,000,000;

                  _________  7.     An employee  benefit plan within the meaning
                  of the Employee Retirement Income Security Act of 1974, if the
                  investment decision is made by a plan fiduciary, as defined in
                  Section 3(21) of such act, which is either a bank, savings and
                  loan association,  insurance company, or registered investment
                  adviser,  or if the employee  benefit plan has total assets in
                  excess  of  $5,000,000  or,  if  a  self-directed  plan,  with
                  investment   decisions   made  solely  by  persons   that  are
                  accredited investors;

                  _________  8.     A private  business  development  company as
                  defined in Section  202(a)(22) of the Investment  Advisers Act
                  of 1940;

                  _________  9.     An   organization   described   in   Section
                  501(c)(3)  of  the  Internal   Revenue  Code,  a  corporation,
                  Massachusetts or similar  business trust, or partnership,  not
                  formed for the specific purpose of acquiring the Shares,  with
                  total assets in excess of $5,000,000;

                  _________ 10.     A trust,  with  total  assets  in  excess of
                  $5,000,000,  not formed for the specific  purpose of acquiring
                  the Shares,  whose  purchase  is  directed by a  sophisticated
                  person who has such  knowledge and experience in financial and
                  business matters that such person is capable of evaluating the
                  merits and risks of investing in the Company;

                  _________ 11.     An entity in which all of the equity  owners
                  qualify  under  any  of  the  above   subparagraphs.   If  the
                  undersigned  belongs to this investor  category only, list the
                  equity owners of the  undersigned,  and the investor  category
                  which each such equity owner satisfies:
                  ______________________________________________________________
                  ______________________________________________________________
                  ______________________________________________________________
                  (Continue on a separate piece of paper, if necessary.)

         (e)      The state of  incorporation  or  formation  of the investor is
__________________  and the investor's  principal office is located in the state
of ___________________________________.

Dated: __________ ,19__

______________________________
Name of investor




______________________________
Signature and title of authorized
officer, partner or trustee

                                        2

<PAGE>

                                    EXHIBIT C

                   PURCHASER'S CERTIFICATE OF SUBSEQUENT SALE

To:      Kathy San Roman
         Lynx Therapeutics, Inc.
         3832 Bay Center Place
         Hayward, CA 94545

         The  undersigned,  the Purchaser or an officer of, or other person duly

authorized by the Purchaser, hereby certifies that _____________________________

institution  was  the  Purchaser  of  the  shares   evidenced  by  the  attached

certificate,  and  as  such,  proposes  to  transfer  such  shares  on or  about

__________  either (check the  applicable  box) [ ] (i) in  accordance  with the

registration statement,  file number _____ in which case the Purchaser certifies

that the  requirement of delivering a current  prospectus has been complied with

or will be complied with in connection with such sale, or [ ] (ii) in accordance

with Rule 144 under the Securities  Act of 1933 ("Rule 144"),  in which case the

Purchaser  certifies  that  it  has  complied  with  or  will  comply  with  the
requirements of Rule 144.

Print or type:

         Name of Purchaser: ____________________________________________________

         Name of Individual
         representing Purchaser
         (if an Institution): __________________________________________________

         Title of Individual
         representing Purchaser
         (if an Institution): __________________________________________________

Signature by:
         Purchaser or
         Individual representing
         Purchaser: ____________________________________________________________



                                                                     EXHIBIT 5.1

October 31, 1997

Lynx Therapeutics, Inc.
3832 Bay Center Place                                      JAMES C. KITCH
Hayward, CA  94545                                         650 843-5027
                                                           [email protected]

Ladies and Gentleman:

You have  requested  our opinion with respect to certain  matters in  connection
with  the  filing  by Lynx  Therapeutics,  Inc.,  a  Delaware  corporation  (the
"Company"),  of a Resale  Registration  Statement on Form S-3 (the "Registration
Statement")  with the Securities and Exchange  Commission (the  "Commission") on
October  31,  1997,  covering  the  offering  of up to  2,675,500  shares of the
Company's  Common  Stock  with a par value of $0.01 (the  "Shares").  All of the
Shares are to be sold by certain  stockholders as described in the  Registration
Statement.

In  connection  with  this  opinion,  we  have  examined  and  relied  upon  the
Registration  Statement and related Prospectus  included therein,  the Company's
Restated  Certificate of Incorporation  and Bylaws,  and the originals or copies
certified  to  our  satisfaction  of  such  records,  documents,   certificates,
memoranda and other  instruments as in our judgment are necessary or appropriate
to enable  us to  render  the  opinion  expressed  below.  We have  assumed  the
genuineness and authenticity of all documents submitted to us as originals,  and
the  conformity to originals of all  documents  where due execution and delivery
are a prerequisite to the effectiveness thereof.

On the basis of the foregoing,  and in reliance  thereon,  we are of the opinion
that the Shares are validly issued, fully paid and nonassessable.

We consent to the reference to our firm under the caption "Legal Matters" in the
Prospectus  included  in the  Registration  Statement  and to the filing of this
opinion as an exhibit to the Registration Statement.

Very truly yours,

COOLEY GODWARD LLP



By:      /s/ James C. Kitch
   --------------------------------
         James C. Kitch

                                        4



                                                                    EXHIBIT 23.1

              CONSENT OF ERNST & YOUNG LLP, INDEPENDENT ACCOUNTANTS


We  consent to the  reference  to our firm under the  caption  "Experts"  in the
Registration  Statement (Form S-3) and related  Prospectus of Lynx Therapeutics,
Inc.  for the  registration  of  2,675,500  shares  of  common  stock and to the
incorporation  by reference  therein of our report dated February 4, 1997,  with
respect to the  consolidated  financial  statements of Lynx  Therapeutics,  Inc.
included in its Annual Report (Form 10-K) for the year ended  December 31, 1996,
filed with the Securities and Exchange Commission.



                                                           /s/ Ernst & Young LLP


Palo Alto, California
October 27, 1997

                                        5



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