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                                                                  EXHIBIT 10.19


                                   AGREEMENT

                                    Between

                              NEW YORK UNIVERSITY

                                      and

                         CALYPTE BIOMEDICAL CORPORATION

                               Research Agreement
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                                June 4, 1993

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

Dear Isaac:

I have read the Research Agreement ("the Agreement") between New York
University and Calypte Biomedical Corporation dated 8/13/93.  The contents of
the Agreement are fully acceptable to me.

I warrant that I am not bound by or party to any agreement which prohibits or
would prohibit the execution and delivery by NYU of the Agreement or the
performance or observance by NYU of any term or condition of the Agreement.

I agree to act, to the best of my ability, in accordance with the terms of the
Agreement insofar as they relate to me.


                                Sincerely yours,


                                /s/ ALVIN FRIEDMAN-KIEN, M.D.
                                
                                Alvin Friedman-Kien, M.D.



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                                  NYU/CALYPTE
                               RESEARCH AGREEMENT



                                   I N D E X
                                   ---------                               
                                

                                                                 
Section   I.         Definitions                                         page  2

Section   2.         Effective Date                                      page  4

Section   3.         Performance of the NYU Research Project             page  4

Section   4.         Funding of the NYU Research Project                 page  5

Section   5.         Title                                               page  7

Section   6.         Patents and Patent Applications                     page  8

Section   7.         License Rights                                      page  10

Section   8.         Option to Acquire Shares                            page  12

Section   9.         Publication                                         page  13

Section  10.         Expiry and Termination                              page  14

Section  11.         No Assignment                                       page  16

Section  12.         Confidential Information                            page  16

Section  13.         Representations and Warranties by CORPORATION       page  17

Section  14.         Representations and Warranties by NYU               page  18

Section  15.         Use of Name                                         page  19

Section  16.         Miscellaneous                                       page  20

                     Appendix I  - Research Project

                     Appendix II - Stock Purchase Agreement

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                                  NYU/CALYPTE
                               RESEARCH AGREEMENT


         This Agreement, made and effective as of August 12th, 1993, (the
"Effective Date") is by and between:

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

                                      AND

         CALYPTE BIOMEDICAL CORPORATION (hereinafter "CORPORATION"), a
corporation organized and existing under the laws of the State of California
having its principal office at 1440 Fourth Street, Berkeley, California 94710.

                                    RECITALS

         WHEREAS, NYU is willing to perform the NYU Research Project (as
hereinafter defined) under the direction of Dr. Alvin Friedman-Kien of NYU
(hereinafter "the NYU Scientist");

         WHEREAS, CORPORATION is prepared to sponsor the NYU Research Project;

         WHEREAS, subject to the terms and conditions hereinafter set forth,
CORPORATION desires to sponsor and NYU is willing to perform the NYU Research
Project (as hereinafter defined);


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

         1.      Definitions.

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

                 a.       "Corporation's Confidential Information" shall mean
                          all confidential or proprietary information of
                          CORPORATION disclosed in writing, or reduced to
                          writing within thirty (30) days of an oral
                          disclosure, and marked "Confidential" by CORPORATION
                          in connection with this Agreement, including without
                          limitation, any product or marketing plan.

                 b.       "Field" shall mean the analysis of HIV antibodies in
                          urine.


                 c.       "Joint Inventions" shall mean any invention made by
                          at least one employee or consultant (not being an
                          employee or student of NYU) of CORPORATION and one
                          employee or student of NYU during the Research Period
                          of the NYU Research Project (as hereinafter defined).

                 d.       "NYU Inventions" shall mean any invention relating to
                          the NYU Research Project (as hereinafter defined)
                          made solely by the NYU Scientist, employees or
                          students of NYU during the Research Period and in the
                          course of the performance of the NYU Research
                          Project.

                 e.       "NYU Know-How" shall mean any information and
                          materials including, but not limited to,
                          pharmaceutical, chemical, biological and biochemical
                          products, technical and


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                          non-technical data, materials, methods and processes
                          and any drawings, plans, diagrams, specifications
                          and/or other documents containing such information,
                          discovered, developed or acquired by, or on behalf of
                          the NYU Scientist, employees or students of NYU
                          during the term and in the course of the NYU Research
                          Project.

                 f.       "NYU Research Project" shall mean the investigations
                          during the Research Period (as hereinafter defined)
                          into the Field under the supervision of the NYU
                          Scientist in accordance with the research program
                          described in annexed Appendix I which forms an
                          integral part hereof.

                 g.       "Research Technology" shall mean all NYU Inventions
                          and NYU Know-How, and NYU's interest in Joint 
                          Inventions.

                 h.       "Research Period" shall mean the three-year period
                          commencing on the Effective Date hereof and any
                          extensions thereof as to which NYU and CORPORATION
                          shall mutually agree in writing.

                 i.       "Rights Period" shall mean the period from the
                          Effective Date to the date one year after the end of
                          the Research Period or, in the event of early
                          termination of this Agreement pursuant to Section
                          3.a. hereof, one year after the date of CORPORATION's
                          written notice to NYU that CORPORATION elects to
                          terminate the Agreement.


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         2.      Effective Date.

                 This Agreement shall be effective as of the Effective Date and
                 shall remain in full force and effect until it expires or is
                 terminated in accordance with Section 10. hereof.

         3.      Performance of the NYU Research Project.

                 a.       In consideration of the sums to be paid to NYU as
                          set forth in Section 4 below, NYU undertakes to
                          perform the NYU Research Project under the
                          supervision of the NYU Scientist during the Research
                          Period.  If, during the Research Period the NYU
                          Scientist shall cease to supervise the NYU Research
                          Project, then NYU shall promptly so notify
                          CORPORATION and CORPORATION shall have the option to
                          terminate this Agreement and shall have no further
                          obligation for funding of the NYU Research Project.
                          CORPORATION shall promptly advise NYU in writing if
                          CORPORATION so elects.  Nothing herein contained
                          shall be deemed to impose an obligation on NYU to
                          find a replacement for the NYU Scientist.

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

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                 c.       Within sixty (60) days after the end of each year of
                          the Research Period, NYU shall prepare a detailed
                          written report describing and summarizing the results
                          of the work conducted on the NYU Research Project
                          during the preceding year.

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

                 e.       NYU agrees to make available and/or transfer to
                          CORPORATION, at CORPORATION's request, a sample
                          and/or copy of the NYU Know-How provided such NYU
                          Know-How is available in transferable quantities
                          and/or reproducible form.

                 f.       During the term of this Agreement the Research
                          Technology shall be used only for scientific research
                          and shall not be used on human beings or in the
                          diagnosis of human beings.

         4.      Funding of the NYU Research Project.

                 a.       As compensation to NYU for work to be performed on
                          the NYU Research Project during the Research Period,
                          subject to any earlier termination of the Research
                          Project pursuant to Section 3.a. hereof, CORPORATION
                          will pay NYU the total sum of
                                                          , payable in six (6)
                          equal and consecutive installments every six (6)
                          months in

Confidential portion has been omitted and filed separately with the Commission



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                          the amount of
                                   each, commencing upon the Effective Date and
                          according to the following schedule:


                                                              
                          Effective Date                         

                          February 12, 1994                      

                          August 12, 1994                        

                          February 12, 1995                      

                          August 12, 1995                        

                          February 12, 1996                      


                 b.       Nothing in this Agreement shall be interpreted to
                          prohibit NYU (or the NYU Scientist) from obtaining
                          additional financing or research grants for the NYU
                          Research Project from government agencies, which
                          grants or financing may render all or part of the NYU
                          Research Project and the results thereof subject to
                          the patent rights of the U.S.  Government and its
                          agencies, as set forth in Title 35 U.S.C. Section 200
                          et seq. However, NYU and the NYU Scientist are
                          prohibited from obtaining additional financing or
                          research grants for the NYU Research Project from
                          other third parties.

Confidential portion has been omitted
and filed separately with the Commission



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                 c.       In the event CORPORATION desires to fund the NYU
                          Research Project beyond the first three years of the
                          Research Period, CORPORATION shall give written
                          notice to NYU at least three (3) months prior to the
                          termination of the Research Period and NYU and
                          CORPORATION shall negotiate in good faith a budget
                          and research plan to extend the Research Period, and
                          the terms of this Agreement (other than the research
                          plan and budget) shall continue in full force and
                          effect with respect to such extended Research Period.

                 d.       The funds or compensation paid by CORPORATION to NYU
                          for work to be performed under this Agreement shall
                          be placed in a separate account and expended in
                          performance of the NYU Research Project as set forth
                          herein.

         5.      Title.

                 a.       All right, title and interest, in and to the Research
                          Technology, and in and to any drawings, plans,
                          diagrams, specifications, and other documents
                          containing any of the Research Technology shall vest
                          solely in NYU.

                 b.       For so long as the NYU Scientist is employed by NYU,
                          any and all inventions made by the NYU Scientist and
                          relating to the Field shall be owned solely by NYU,
                          unless such inventions are jointly made by
                          CORPORATION personnel and the NYU Scientist and/or
                          NYU personnel and/or NYU students, in which case such
                          inventions shall be Joint Inventions and jointly
                          owned with all right, title and interest vesting
                          jointly in NYU and CORPORATION as defined under the
                          laws of the United States of America.

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         6.      Patents and Patent Applications.

                 a.       NYU will require the NYU Scientist and its employees
                          and students working on the NYU Research Project to
                          disclose potential NYU Inventions and/or Joint
                          Inventions to NYU's Office of Industrial Liaison
                          promptly upon the making thereof.  NYU will disclose
                          all such NYU Inventions and/or Joint Inventions to
                          CORPORATION in writing within sixty (60) days after
                          such NYU Invention and/or Joint Invention was
                          disclosed to NYU's Office of Industrial Liaison.

                 b.       CORPORATION shall promptly disclose to NYU in writing
                          the making of any Joint Invention by any employee or
                          consultant of CORPORATION within sixty (60) days
                          after such invention was disclosed to CORPORATION.

                 c.       At the initiative of CORPORATION or NYU, the parties
                          shall consult with each other regarding the filing
                          and prosecution of all patent applications with
                          respect to the NYU Inventions or Joint Inventions.
                          Such patent applications shall be filed, prosecuted
                          and maintained by patent counsel jointly selected by
                          NYU and CORPORATION.  Copies of all such patent
                          applications and patent office actions shall be
                          forwarded to each of NYU and CORPORATION on a timely
                          basis.  NYU and CORPORATION shall each also have the
                          right to have such patent applications and patent
                          office actions independently reviewed by other patent
                          counsel separately retained by NYU or CORPORATION.

                 d.       If CORPORATION requests and provides written
                          approval, all applications and proceedings with
                          respect to the NYU Inventions and Joint Inventions
                          shall be filed, prosecuted and maintained

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                 by NYU at the expense of CORPORATION.  Against the submission
                 of detailed quarterly invoices, CORPORATION shall reimburse
                 NYU for all reasonable out-of pocket costs and fees incurred
                 by NYU during the term of this Agreement, in connection with
                 the filing, maintenance, prosecution, and issuance of the NYU
                 Inventions and/or Joint Inventions; provided, however, NYU
                 shall not be entitled to reimbursement for patent filing,
                 prosecution and maintenance expenses in excess of ten thousand
                 dollars ($10,000) per year with respect to any NYU Inventions
                 or Joint Inventions unless NYU has obtained the prior written
                 consent of CORPORATION to such expenses.  In the event
                 CORPORATION refuses consent for such expenditures relating to
                 a NYU Invention, NYU shall be free to pursue patent protection
                 with respect to such NYU Invention at NYU's sole expense and
                 all rights to such NYU Invention shall revert to NYU and
                 CORPORATION shall have no rights with respect to such NYU
                 Invention.  In the event CORPORATION refuses consent for
                 expenditures relating to a Joint Invention, NYU shall be free
                 to pursue patent protection with respect to such Joint
                 Invention at NYU's sole expense.  However, all right, title
                 and interest shall remain jointly owned and vested in NYU and
                 CORPORATION.

                 e.       CORPORATION shall have the right to comment on and
                          approve the strategy and prosecution of the patent
                          applications.  NYU shall not abandon any applications
                          without first consulting with CORPORATION and
                          obtaining CORPORATION's consent for such abandonment
                          unless abandonment is in favor of a subsequent

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                          patent application claiming the subject matter of the
                          proposed abandoned application and the patentability
                          of the subject matter is not negatively affected.
                          The parties agree to cooperate with each other
                          regarding the patent applications for NYU Inventions
                          and Joint Inventions and NYU agrees to use its best
                          efforts to obtain and maintain any patent
                          applications and patents on NYU Inventions and Joint
                          Inventions.

                 f.       Nothing herein contained shall be deemed to be a
                          warranty by NYU that NYU can or will be able to
                          obtain any patent or patents on any patent
                          application or applications with respect to the NYU
                          Inventions or Joint Inventions or any portion
                          thereof, or that any of such patents will afford
                          adequate or commercially worthwhile protection.

                 g.       Nothing herein contained shall be deemed to be a
                          warranty by CORPORATION that CORPORATION can or will
                          be able to obtain any patent or patents on any patent
                          application or applications with respect to Joint
                          Inventions or any portion thereof, or that any such
                          patents will afford adequate or commercially
                          worthwhile protection.

         7.      License Rights.

                 a.       Subject to rights of the U.S. Government and its
                          agencies, if any, and to the provisions of this
                          Section 7.a., NYU shall grant CORPORATION an
                          exclusive, worldwide, license with right to
                          sublicense to make, have made, use and/or sell any
                          products or materials, related to or covered by the
                          NYU Inventions, and/or

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                 NYU's interest in Joint Inventions, and/or NYU Know-How.("the
                 License").  The License shall be set forth in an executed
                 license agreement, containing other terms and provisions as
                 shall be negotiated in good faith and using best efforts by
                 NYU and CORPORATION.  The term of the license agreement shall
                 remain in force, unless previously terminated under the
                 executed license agreement, until the expiration date of the
                 last to expire patent rights or in the case of non-patentable
                 rights, for a period of at least ten (10) years from the
                 execution date of the license agreement.  CORPORATION shall
                 have nine (9) months from the first disclosure by NYU of an
                 NYU Invention, Joint Inventions, or NYU Know-How to request
                 and conclude an agreement with respect to the License.  If
                 CORPORATION has not concluded such an agreement with NYU
                 within nine (9) months after such disclosure, CORPORATION's
                 rights under this Section 7.a. shall terminate and NYU shall
                 have the right to commence negotiations with a third party
                 with respect to NYU Inventions, NYU's share of Joint
                 Inventions and NYU Know-How disclosed to CORPORATION.

                 b.       During the Rights Period.  NYU shall not disclose the
                          Research Technology to any third party except with
                          CORPORATION's prior written consent or pursuant to
                          Sections 9 and 12 hereof, until and unless such
                          Research Technology has been offered to CORPORATION
                          pursuant to Section 7.a. above and CORPORATION has
                          failed to conclude a license agreement as provided in
                          Section 7.a. above.

                 c.       If, during the Rights Period, NYU shall negotiate a
                          license agreement with a third party relating to any
                          part of the Research
   15
                          Technology after the expiration Of CORPORATION's
                          rights as provided in Section 7.a. NYU shall offer
                          CORPORATION the right to enter into such license
                          agreement upon the same terms and conditions
                          negotiated with such third party; such right shall be
                          exercisable by CORPORATION for a period of thirty
                          (30) days after receipt by CORPORATION of a copy of
                          such negotiated agreement from NYU.  If CORPORATION
                          fails to execute such negotiated agreement within
                          such 30-day period, NYU shall have no further
                          obligation to CORPORATION and shall be free to
                          execute such negotiated agreement with a third party.

         8.      Option to Acquire Shares

                 CORPORATION hereby grants NYU the option to purchase shares of
                 the CORPORATION's Common Stock, in the quantities, and on the
                 terms, set forth in the Stock Purchase Agreement which is
                 annexed hereto as Appendix II.  The option described herein
                 shall be exercisable by NYU during the period commencing upon
                 the Effective Date and terminating six (6) months thereafter
                 ("the option period").  If NYU chooses to exercise such
                 option, it shall given written notice thereof to the
                 CORPORATION within the option period.  Closing for the
                 purchase of the stock shall be at such time, date and place as
                 are mutually satisfactory to the CORPORATION and NYU, provided
                 that such closing shall occur not later than two (2) weeks
                 after delivery by NYU of the notice that it is exercising its
                 option to purchase stock.  Payment for the stock purchased by
                 NYU shall be made in full at the closing by


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                 check payable to the CORPORATION.  On or before the closing,
                 NYU and CORPORATION shall enter into the Stock Purchase
                 Agreement annexed as Appendix H.

         9.      Publication.

                 a.       Prior to submission for publication or presentation
                          of a manuscipt describing the results of any aspect
                          of the NYU Research Project, NYU shall send
                          CORPORATION a copy of the manuscript to be submitted
                          or presented, and shall allow CORPORATION sixty (60)
                          days from the date of such mailing to determine
                          whether the manuscript i) discloses Corporation's
                          Confidential Information or ii) contains subject
                          matter for which patent protection should be sought
                          for an NYU Invention or Joint Invention prior to
                          publication or presentation of such manuscript.
                          Should CORPORATION believe the subject matter of the
                          manuscript discloses Corporation's Confidential
                          Information or contains a patentable invention, then
                          prior to the expiration of such 60-day period from
                          the mailing date of such manuscript to CORPORATION by
                          NYU, CORPORATION shall given written notification to
                          NYU of its determination.

                 b.       After the expiration of the sixty (60) day period
                          from the date of mailing such manuscript to
                          CORPORATION, unless NYU has received the written
                          notice specified above from CORPORATION, NYU shall be
                          free to submit such manuscript for publication or
                          presentation to publish the disclosed research
                          results in any manner consistent with academic
                          standards.



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                 c.       Upon receipt of such written notice from CORPORATION
                          that such manuscript discloses Corporation's
                          Confidential Information, NYU shall delete such
                          information from the publication or presentation.

                 d.       Upon receipt of such written notice from CORPORATION
                          that the manuscript contains patentable inventions,
                          NYU will thereafter delay submission of the
                          manuscript for an additional period of up to sixty
                          (60) days to permit the preparation and filing in
                          accordance with Section 6. hereof of U.S. patent
                          application by NYU on the subject matter to be
                          disclosed in such manuscript.  After expiration of
                          such 60-day period, or the filing of a patent
                          application on each such invention, whichever shall
                          occur first, NYU shall be free to submit or present
                          the manuscript and to publish the disclosed results.

                 e.       CORPORATION shall have the right to render comments
                          on the manuscript, if any, to NYU and/or the NYU
                          Scientist.  NYU shall consider CORPORATION's
                          comments, but NYU's decision as to what the
                          publication or presentation shall contain will be
                          final, subject to compliance with c. and d. above.

         10.     Expiry and Termination.

                 a.       Unless earlier terminated pursuant to Section 3.a. or
                          this Section 10, this Agreement will terminate upon
                          the expiration of the Rights Period.  The provisions
                          of Sections 8, 9, 10, 12 and 15 hereof shall survive
                          and remain in full force and effect after any
                          expiration, cancellation or termination of this
                          Agreement, including early termination as set forth
                          below.

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                 b.       At any time prior to expiration of this Agreement
                          pursuant to Section 10.a. hereof, any party may
                          terminate this Agreement for cause, as "cause" is
                          described below, by giving written notice to the
                          other party.  Cause for termination by one party of
                          this Agreement shall be deemed to exist when there
                          has been a material breach or default by any party of
                          any of the terms of this Agreement, and when such
                          breaching or defaulting party has failed to cure such
                          breach within ninety (90) days after receipt of
                          written notice thereof from the non-breaching party.

                 c.       Any party to this Agreement may, upon giving notice
                          of termination, immediately terminate this Agreement
                          upon receipt of notice that any other party has
                          suspended its business.

                 d.       Any amount payable hereunder by one of the parties to
                          the other, which has not been paid by the date on
                          which such payment is due, shall bear interest from
                          such date until the date on which such payment is
                          made, at the rate of one percent (1%) per annum in
                          excess of the prime rate prevailing at the Citibank,
                          N.A., in New York, during the period of arrears and
                          such amount and the interest thereon may be collected
                          or set off against any amount due, whether in terms
                          of this Agreement or otherwise, to the party in
                          default by any non-defaulting party.

                 e.       Upon expiration or termination of this Agreement
                          pursuant to Sections 10.a. - 10.c. above, and without
                          execution of an agreement with respect to the License
                          as provided in Section 7.a., all rights in and to the
                          Research Technology shall revert to NYU


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                          and CORPORATION shall not be entitled to make any
                          further use of the Research Technology.  However, in
                          the event that NYU Inventions and/or Joint Inventions
                          are made during the Research Period, but the
                          resulting patent applications are filed after the
                          Research Period ends, CORPORATION shall have the
                          right to a License as provided in Section 7.a.

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

         11.     No Assignment.

                 Neither CORPORATION nor NYU shall have the right to assign,
                 delegate or transfer at any time to any party, in whole or in
                 part, any or all of the rights, duties and interest herein
                 granted without first obtaining the written consent of the
                 other to such assignment, which consent shall not be
                 unreasonably withheld.  However, CORPORATION shall have the
                 right to assign, delegate or transfer at any time, in whole or
                 in part, any or all of the rights, duties and interest herein
                 granted to a Corporation Entity upon giving written notice to
                 NYU.

         12.     Confidential Information.

                 Except as otherwise provided in this Section and in Section 9,
                 the parties agree that for the term of the Rights Period and
                 for five (5) years thereafter, NYU shall maintain all of
                 Corporation's Confidential



                                     - 16 -
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                 information disclosed to NYU in confidence and shall not
                 disclose it to any third party and CORPORATION shall maintain
                 any Research Technology in confidence and shall not disclose
                 it to any third party except to the extent the receiving party
                 can establish that such information:

                 1.       was already known to the receiving party, other than
                          under an obligation of confidentiality, at the time
                          of disclosure by the providing party;

                 2.       was generally available to the public or otherwise
                          part of the public domain at the time of its
                          disclosure to the receiving party;

                 3.       became generally available to the public or otherwise
                          part of the public domain after its disclosure and
                          other than through any act or omission of the
                          receiving party in breach of this Agreement; or

                 4.       was subsequently lawfully disclosed to the receiving
                          party by a third party.

                 Each party may disclose the other's information to the extent
                 such disclosure is reasonably necessary in prosecuting or
                 defending patents and litigation, complying with applicable
                 governmental regulations and laws, and conducting clinical
                 trials.

         13.     Representations and Warranties by CORPORATION.

                 CORPORATION hereby represents and warrants to NYU as follows:

                 (1)      CORPORATION is a corporation duly organized, validly
                          existing and in good standing under the laws of the
                          State of California. CORPORATION has been granted all
                          requisite power and authority to



                                     - 17 -
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                          carry on its business and to own and operate its
                          properties and assets.  The execution, delivery and
                          performance of this Agreement have been duly
                          authorized by the Board of Directors of CORPORATION;

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

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

         14.     Representations and Warranties by NYU.

                 NYU hereby represents and warrants to CORPORATION as follows:

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

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




                                     - 18 -
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                 (3)      There is no indenture, contract, or agreement to
                          which NYU and/or the NYU Scientist is a party or by
                          which NYU and/or the NYU Scientist is bound which
                          prohibits or would prohibit the execution and
                          delivery by NYU of this Agreement or the performance
                          or observance by NYU of any term or condition of this
                          Agreement; and

                 (4)      That all right, title and interest in and to the
                          Research Technology is owned solely by NYU and NYU
                          has the sole right to grant licenses thereto and to
                          enter into this Agreement.

         15.     Use of Name.

                 Without the prior written consent of the other party which
                 consent shall not be unreasonably withheld in accordance with
                 the business practices and policies of the party whose consent
                 is sought, neither CORPORATION nor NYU shall use the name of
                 the other party or any adaptation thereof or of any staff
                 member, employee or student of the other party, including
                 without limitation, in any product labeling, advertising or
                 sales literature.  However, in the event that disclosure is
                 required in connection with any public or private offering,
                 in connection with a lawsuit settlement involving NYU and/or
                 Joint Inventions, in conjunction with any application for
                 regulatory approval, or is otherwise required by law, either
                 party can make factual statements concerning this Agreement or
                 file copies of this Agreement so long as the other party has
                 an opportunity to review and comment on the statements prior
                 to such intended disclosure.  The comment period shall be ten
                 (10) working days from the receipt of such


                                     - 19 -
   23
                 statements unless the parties agree to an extension.  Except
                 as provided herein, neither NYU nor CORPORATION will issue
                 public announcements about this Agreement.

         16.     Miscellaneous.

                 a.       In carrying out this Agreement the parties shall
                          comply with all applicable local, state and federal
                          laws and regulations.

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

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

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

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





                                     - 20 -
   24

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

                          Attention:       Isaac T. Kohlberg 
                                           Vice President for
                                           Industrial Liaison
                                and

                          Office of Legal Counsel
                          New York University
                          Bobst Library
                          70 Washington Square South
                          New York, NY 10012

                          Attention:       Annette B. Johnson, Esq.  
                                           Associate General Counsel




 To CORPORATION:          Calypte Biomedical Corporation
                          1440 Fourth Street
                          Berkeley, California  94710

                          Attention:       David J. Robison, Ph.D.
                                           President and
                                           Chief Executive Officer


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

                 f.       This Agreement (and the annexed Appendices)
                          constitute the entire Agreement between the parties
                          and no variation, modification or waiver of any of
                          the terms or conditions hereof shall be deemed valid
                          unless made in writing and signed by both parties
                          hereto.

                                     - 21 -
   25
                 This Agreement supersedes any and all prior agreements or
                 understandings, whether oral or written, between CORPORATION
                 and NYU.

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

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

                 i.       It is not the intent of the parties to create a
                          partnership or joint venture or to assume partnership
                          responsibility or liability.  The obligations of the
                          parties shall be limited to those set out herein and
                          such obligations shall be several and not joint.  NYU
                          shall perform under this Agreement only as an
                          independent contractor.





                                     - 22 -
   26
                 j.       In the event of a delay caused by inclement weather,
                          fire, flood, strike, or other labor dispute, act of
                          God, act of governmental officials or agencies, or
                          any other cause beyond the control of a party, such
                          party shall be excused from performance hereunder for
                          the period of time attributable to such delay.

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

                              NEW YORK UNIVERSITY

                              By: /s/  ISAAC T. KOHLBERG
                                  ----------------------                
                                       Isaac T. Kohlberg

                              Title:  Vice President for 
                                      Industrial Liaison

                              Date: August, 10th, 1993

 
                              CALYPTE BIOMEDICAL CORPORATION

                              By: /s/  David J. Robison
                                  ---------------------      
                              Title:  President and CEO

                              Date:  August 12, 1993



                                     -23 -
   27

                                                                      APPENDIX I

                   DETECTION OF INFECTIOUS HIV-I IN URINE OF
                            SEROPOSITIVE INDIVIDUALS

ABSTRACT

We have previously described the high prevalence of antibodies to HIV-I in
urine from HIV-I seropositive individuals.  Recently, we reported the presence
of HIV-I proviral DNA, HIV-I RNA and p24 core protein in urine cell pellets
from AIDS patients.  Our data suggest that HIV-I could be transmissible via
urine from seropositive individuals.  Urine cell pellets and cell-free
sediments from twenty urine specimens of HIV positive patients will be
collected.  Part of the urine cell pellet from each specimen will be incubated
with TNFa which has been previously shown to be, able to stimulate the
expression of HIV-I.  The cells and sediments will then be cultured with PBMC
from HIV-I seronegative donors.  The infectivity of urine will be determined by
cytopathic effects (CPE), P24 antigen assay, Polyrmerase Chain Reaction (PCR)
and by Electron Microscopy.  This study should help to elucidate and confirm if
urine may serve as a potential infectious body fluid for HIV-I.

BACKGROUND

Human immunodeficiency virus type I (HIV-I), the etiologic agent of the
acquired immunodeficiency syndrome (AIDS) has been isolated from the peripheral
blood mononuclear cells (PBMC), and serum from infected individuals; it has
also been found in other body fluids including cerebrospinal fluid, saliva,
tears, vaginal secretions, breast milk, semen, and alveolar fluid.(1-5) Our
laboratory reported that antibodies against HIV-I proteins are found in urine
of HIV seropositive individuals (7).  With the rapidly increasing incidence of
HIV-I infection, the question of whether infectious virons of HIV can be
detected in the urine from HIV-I-infected individuals becomes increasingly
important, since urine could serve as a means of HIV-I transmission.  Levy et
al., detected HIV-I in one of five urine specimens examined (8).  However,
Skolnik et al., were unable to detect HIV-I in the urine specimens from HIV-I
seropositive individuals examined (9).  Recently, we reported the presence of
HIV-I proviral DNA sequences in centifuged fresh cell pellets from urine of
HIV-I infected individuals (10).  Furthermore, we detected HIV-I RNA and p24
core protein in these urine cell pellets as well (11).  The question is raised
whether the urine from HIV-I infected host could potentially serve as an
infectious body fluid for transmission of AIDS. 1) Urine specimens in general
frequently contains small numbers of mononuclear cells (<2 x 106/24 hours);
these same cells when located in blood or lymph nodes are known to serve as
reservoirs of HIV. 2) A variety of renal diseases have been described in HIV-I
infected patients such as nephropathy associated with tubulointersitial
mononuclear cells infiltrate (12).  In addition, the incidence of urinary tract
infections is increased in the HIV-I infected host (12).  It is probable that
the number of mononuclear cells found in urine of AIDS patients may be greater
than that found in healthy subjects. 3) The structural cells and tissues of the
genitourinary tract, other than the mononuclear cells may be susceptible to
infectious HIV-I.  It has been shown that g1omerular endothelial and mesangial
cells can be infected by HIV-I in vitro (13).  Hypothetically, the cellular
components found in the urine of an HIV-infected host could contain infectious
virus.  As a matter of fact, we have shown that genomic fragments of HIV-I are
present in the cells found in the centrifuged urine pellets from some HIV-I
sempositive individuals (11).  These data suggest that HIV-I could be
transmissible via urine from HIV-I seropositive individuals which has not been
previously examined in great detail.

In the only previous report concerning the absence of infectious HIV-I in urine
of seropositive patients. 36ml of ultracentifuged urine pellets were used as
the source of
   28
HIV-I for cell culture; in that study the mononuclear cells found in urine
pellets were likely to have been disrupted during the ultracentrifugation
procedure.  The infectivity of HIV-I virions of HIV-I might be diminished in
presence of concentrated various salts or crystals usually found in urine, such
as oxylated and urates, which would be precipitated with the virus at 40C for
1.5 hours.  It has been shown that tumor necrosis factor alpha (TNFa) is
capable of inducing HIV-I expression in cells infected with HIV-I (14).  The
activity of HIV-I found in cells of urine might be enhanced by TNF-a and
therefore be more easily detected.  It is possible that HIV-I virions present
in urine might prove to be infectious if the conventional method used for
collection and detection are modified.

PRELIMINARY STUDIES AND RESULTS

See two previously published papers (attached).

SPECIFIC AIMS

To determine whether urine from HIV-I infected individuals is potentially an
infectious body fluid for the transmission of HIV-I.

EXPERIMENTAL DESIGN AND PROCEDURES

         A)      Initially the urine samples from a group of about 100 HIV-I
                 seropositive individual will be screened for the presence of
                 HIV-I sequences in their fresh urine pellets by Polyrmerase
                 Chain Reaction (PCR), Reverse Transcriptation-PCR (RTR-PCR),
                 and in situ hybridization as we have described previously
                 (10,11).

         B)      We expect to find at least 20 HIV-I positive urine specimens
                 to be used for the following studies (see schematic diagram).
                 Urine specimens will be first centrifugated at 3000 rpm at 40C
                 for 5 minutes to obtain the cell pellets and the urine
                 supernants will then be ultracentrifuged at 30,000 rpm at 4O C
                 for 1.5 hr to obtain cell-free virus, if present.  The urine
                 cell pellets will be washed X3 with HBSS containing
                 Gentarmycin 50gg/ml, and Amphotericin B l5gg/ml.  The
                 ultracentifugated cell-free sediment will be resuspended in
                 HBSS containing these antibiotics.  Half of the urine cell
                 pellets from each individual will then be resuspended in RPMI
                 1640 medium supplemented with 10% fetal calf serum and 100
                 units of TNF-a/ml (Genzyme) at 370C for 24 hours.  The cells
                 and sediments from urine will also be cultured with 5 x 106
                 PBMC from HIV-I seronegative donors in RPM2 1640 medium
                 containing 2gg/ml polybrene (Sigma, St. Louis) and 10%
                 interleukin-2 (Sigma), supplemented with Penicillin 25ORg/ml.
                 Streptomycin 250gg/ml, herpes buffer (0.01M), L-glutamine
                 (2mM) and 20% heat-inactivated fetal calf serum.  The donor
                 PMBC used will have been separated by ficoll-hypaque
                 differential centrifugation and then stimulated for 3 to 4
                 days with 10% IL-2 and 10gg/ml of phytohemagglutinin-p (PHA-p:
                 Sigma. St. Louis) in RPMI-1640 medium.

                 The cultures will be incubated at 370C in 5% CO2 atmosphere
                 for 6 weeks.  Half the media of each culture will be changed
                 twice a week.  Fresh PBMC stimulated with PHA-p will be added
                 to the cultures once each week for 6 weeks.

         C)      The presence of infectious HIV in Urine will be determined by:

                 1)       Cytopathic effect (CPE) including  syncytia by
                          microscopy examination,
   29
                 2)       Cultures will be tested twice weekly for the presence
                          of HIV-I P24 antigen. by ELISA (Abbott Laboratories)
                 3)       Aliquots of the cell cultures will be collected once
                          weekly to detect H1V-I DNA and/or RNA by PCR and
                          RT-PCR methods (11).
                 4)       Electromicroscopy examination of the culture for
                          possible detection of HIV-I infection will be
                          performed (15).

In summary, utilizing the modified methods proposed in this proposal, we hope
to ascertain whether the fragments of HIV-I we have recently detected and
described in the urine pellets of seropositive individuals could represent
infectious virus.

REFERENCES:

1.       Fujikawa, L.S.S.L., Salhuddin, D. Ablashi, et al., HTLV-III in the
         tears of AIDS patients.  Ophthalmology 1986 93: 1479-1481.
2.       Ho, D.D., T.R. Rata, R.T. Schooley, et al.  Infrequency of isolation
         of HTLV-III virus from saliva in AIDS. 1985 N. Engl. J. Med. 313:
         1606.
3.       Ho, D.D., T.R. Rata, R.T. Schooley, et al.  Isolation of HTLV-III from
         cerebrospinal fluid and neural tissues of patients with - neurologic
         syndromes related to the acquired immunodeficiency syndrome. 1985 N.
         Engl. J. Med. 313: 1493-1497.
4.       Thing, L., S. Sprecher-Goldberger, T. Jonckheer, et al.  Isolation of
         AIDS virus from cell-free beast milk of three health virus carriers.
         1985 Lancet ii 891-892.
5.       Vogt, M.W., D.J. Witt, D.Z. Craven, et al.  Isolation patterns of the
         human immunodeficiency virus from cervical secretions during the
         menstrual cycles of women at risk for the acquired immunodeficiency
         syndrome. 1987 Ann.  Intern.  Med. 106: 380-382.
6.       Ho, DD, Schooley RE, Rota RT: HTLV-III in the semen and blood of a
         healthy homosexual man.  Science 1984 226:451-453.
7.       Cao YZ, Friedman-Kien AE, Chuba VJ.  IgG antibodies to HIV-I in urine
         of HIV-I seropositive individuals.   Lance 1988, i:831-832.
8.       Levey, J.A., L.S. Kaminsky, W.J.W. Morrow, et al. Infection by the
         retrovirus associated with the acquired immunodeficiency syndrome.
         Ann. Intern. Med. 1985 103: 694-699.
9.       Skolnick PR, Kosloff BR, Bechtel LJ et al., Absence of infectious
         HIV-I in the urine of seropositive viremic subjects. 1989.  L Infect.
         Dis. 160:1056-1060.
10.      Li JJ, Friedman-Kien AE, Huang YQ.  HIV-I DNA proviral sequences in
         fresh urine pellets from HIV-I seropositive persons. 1990 Lancet
         6:1590-1591.
11.      Li, J.J., Huang, Y.Q., Poiesz, B.J. et al.  Detection of Human
         Immunodeficiency Virus Type I (HIV-I) in Urine Cell Pellets fro HIV-I
         Seropositive Individuals. 1992 30: 1051-1055.
12.      Mazbar SA, Schoenfeld PY, Humphre MG. Renal involvement in patients
         infected with HIV-I: Experience at San Francisco General Hospital.
         Kidney Int. 1990 37: 1325 - 1332.
13.      Green, D.F., Resnick, L., and Bourgolgere.  J.J. HIV infects
         glomerular endothelial and mesangial but not epithelial cells in
         vitro.  1992 41: 956-960.
14.      Poll G, Kinter A, Justement JS et al.  Tumor necrosis factor 2
         functions in an antocrine manner in the induction of human
         immunodeficiency virus expression.  Proc. Nat]. Acad. Sci. USA
         1990 87: 782-785.
15.      Huang YQ, Li JJ, Kim KS, Nicolaides A. Zhang WG, Le J., Poiesz BJ,
         Friedman-Kien AE. HIV-I infection and modelation of cytokines and
         growth factor expression In Kaposi's sarcoma-derived cells in vitro.
         AIDS 1993 7: 317-322.
   30
24 hour Urine Specimens from HIV-I seropositive Individuals


                                   centrifuge
                                    3000 rpm



         cell pellet                                  supernatant

                                                         centrifuge
                                                         30,000 rpm

         wash (3x)                                   cell-free pellet



         cell pellet     

incubate                No TNF2
with
TNF2

                     
         culture resulting cell                culture resulting pellet
         pellets with PBMC                     with PBMC



                    detection of HIV-I by CPE, PCR, P24, EM
   31
                                                                     Appendix II





                         CALYPTE BIOMEDICAL CORPORATION

                            STOCK PURCHASE AGREEMENT



         This agreement is made as of the    day of             1993, between
Calypte Biomedical Corporation, a California corporation (the "Company") and New
York University (the "Purchaser").

1.       Purchase and Sale of Stock.

         The Company hereby sells to the Purchaser and the Purchaser hereby
         purchases from the Company,         shares of the Company's Common
         Stock (the "Shares") at a purchase price of        per share for an
         aggregate purchase price of       .  The Company will promptly, after
         delivery of this Agreement and a check for the aggregate purchase
         price, issue a certificate representing the Shares registered in the
         name of the Purchaser.

2.       Legends.

         All certificates representing any of the Shares shall have endorsed
thereon legends in substantially the following form:

         a.      "THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "ACT").  THESE
SECURITIES HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO, OR IN
CONNECTION WITH, THE DISTRIBUTION THEREOF.  THESE SECURITIES MAY NOT BE
OFFERED, SOLD, PLEDGED, OR TRANSFERRED UNLESS A REGISTRATION STATEMENT UNDER
THE ACT IS IN EFFECT AS TO THESE SECURITIES OR THERE IS AN OPINION OF COUNSEL,
SATISFACTORY TO THE CORPORATION, THAT AN EXEMPTION THEREFROM IS AVAILABLE."

         b.      Any legend required to be placed thereon by the California
Commissioner of corporations, or required by the applicable blue sky laws of
any state.

3.       Company's Representations.

         In connection with the purchase of the Shares, the Company hereby
represents and warrants to the Purchaser as follows:

         a.      Authorization; Valid Issuance.  All corporate action on the
part of the Company necessary for the authorization, execution and delivery of
this Agreement, the performance of all obligations of the Company hereunder and
the authorization, issuance and delivery of the Shares being sold hereunder has
been taken.  The Shares, when issued and delivered pursuant to this Agreement,
for the consideration set forth herein, will be duly and validly issued,
fully-paid, and non-assessable.

Confidential portion has been omitted and filed separately with the Commission
   32
         b.      Capitalization.  The authorized number of shares of Common
Stock of the Company is 52,000,000.  The authorized number of shares of
Preferred Stock of the Company is 42,075,510, of which 1,000,000 shares are
designated Series A Preferred Stock, 8,048,472 shares are designated Series B
Preferred Stock, 17,027,038 shares are designated Series C Preferred Stock, and
16,000,000 are designated Series D Preferred Stock.

         As of June 20, 1993, 5,207,780 shares of Common Stock are issued and
outstanding and 1,000,000, 8,048,472, 17,027,038, 9,999,998 shares of Series A
Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, and Series
D Preferred Stock, respectively, are issued and outstanding.  In addition, the
Company has issued a warrant exercisable for 120,000 shares of Series D
Preferred Stock, which warrant can be exercised at $0.84 per share.  Also, the
Company has issued options to acquire 2,655,461 shares of Common Stock, and has
2,254,458 shares of Common Stock available for issuance pursuant to the
Company's 1990 Stock Option Plan.

         The Series A Preferred Stock is not convertible into Common Stock.
Each share of Series B, Series C, and Series D Preferred Stock is currently
convertible into one share of Common Stock, subject to future adjustments set
forth in the Company's Restated Articles of Incorporation.  Accordingly, the
Company's fully-diluted capitalization (including the Common and Preferred
Stock outstanding, the warrant, and the outstanding options but excluding the
remaining Common Stock available for issuance pursuant to the Company's 1990
Stock option Plan) stated on a Common Stock-equivalent basis, excluding the
shares issued hereby, is 43,058,749 shares of Common Stock.

4.       Purchaser's Representations.

         In connection with its purchase of the Shares, the Purchaser hereby
represents and warrants to the Company as follows:

         a.      Investment Intent; Capacity to Protect Interests.  The
Purchaser is purchasing the Shares solely for investment and not with any
present intention of selling or otherwise disposing of the Shares or any
portion thereof in any transaction other than a transaction exempt from
registration under the Securities Act of 1933, as amended (the "Act").  The
Purchaser also represents that the entire legal and beneficial interest of the
Shares is being purchased, and will be held, for the Purchaser's account only,
and neither in whole nor in part for any other person.

         b.      Information concerning company.  The Purchaser has had the
opportunity to discuss the plans, operations, and financial condition of the
Company with its officers and has received all information the Purchaser has
deemed appropriate to enable the



                                      -2-
   33
Purchaser to evaluate the financial risk inherent in investing in the Shares.

         c.      Economic Risk.  The Purchaser realizes that the purchase of
the Shares involves a high degree of risk, and the Purchaser is able, without
impairing its financial condition, to hold the Shares for an indefinite period
of time and to suffer a complete loss of its value.

         d.      Accredited investor.  The Purchaser is an "accredited
investor" as defined under Regulation D of the Act.

         e.      Restricted Securities.  The Purchaser acknowledges that the
sale of the Shares has not been registered under the Act.  The Shares must be
held indefinitely unless subsequently registered under the Act or an exemption
from such registration is available, and the Company is under no obligation to
register the Shares.

         f.      Disposition under Rule 144.  The Purchaser understands:

                 1.       that the Shares are restricted securities within the
meaning of Rule 144 promulgated under the Act which limits the sale of the
Shares in a public market transaction;

                 2.       that the exemption from registration under Rule 144
will not be available, in any event, for at least two years from the date of
purchase of and actual payment for the Shares, and even then will not be
available unless (A) a public trading market then exists for the Common Stock
of the Company, (B) adequate information concerning the Company is then
available to the public, and (C) other terms and conditions of Rule 144 are
complied with; and

                 3.       that certain sales of the Shares may be made only in
limited amounts in accordance with such terms and conditions.

5.       Market Standoff Agreement.

         In the event that the Company should propose to offer its securities
to the general public in an initial public offering, the Purchaser agrees, at
the option of the managing underwriters of such offering, not to sell any
securities of the Company, other than securities registered in such offering,
for a period specified by the Company not to exceed 180 days from the effective
date of the registration statement filed with the Securities and Exchange
Commission, pursuant to which such offering is to be made.  The Purchaser
further agrees, upon the request of such managing underwriter or underwriters,
to execute and deliver such further agree-

                                      -3-
   34
ments and instruments, consistent herewith, as it or they may reasonably
request to effect this limitation.

6.       Right of First Refusal.

         Before any of the Shares registered in the name of the Purchaser or of
any transferee thereof may be sold or transferred (including transfer by
operation of law), such Shares shall first be offered to the Company as
follows:

         a.      The Purchaser shall deliver a notice to the Company stating
(i) the Purchaser's bona fide intention to sell or transfer such Shares, (ii)
the number of such Shares to be sold or transferred, and (iii) the price for
which the Purchaser proposes to sell or transfer such shares, and (iv) the name
of the proposed purchaser or transferee.

         b.      Within twenty (20) days after receipt of such notice, the
Company or its assignee may elect to purchase all, but not less than all,
Shares to which the notice refers, at the price per share specified in the
notice.  Full payment for all the Shares to which the notice refers shall be
made by cash or check to the Purchaser within thirty (30) days after receipt of
the notice.

         c.      If the Shares to which the notice refers are not elected to be
purchased as provided in Section 6b, the Purchaser may sell the Shares to any
person named in the notice at the price specified in the notice or at a higher
price, provided that such sale or transfer is consummated within sixty (60)
days of the date of the notice to the Company, and, provided further, that any
such sale is in accordance with all the terms and conditions hereof.

         d.      Any shares so transferred will continue to be subject to the
right of first refusal provided in this Section 6.

         The provisions of this Section 6 shall terminate on (i) the effective
date of a registration statement filed by the Company under the Act, with
respect to an underwritten public offering of Common Stock of the Company or
(ii) the closing date of a sale of substantially all of the assets or merger of
the Company pursuant to which shareholders of the Company receive securities of
a buyer whose shares are publicly traded.

7.       Registration Rights.

         The Purchaser is hereby granted the "piggyback" registration rights
set forth in Section 9.5 of that certain Agreement for the Purchase and Sale of
Series D Preferred Stock dated as of December 28, 1992 by and between the
Company and the purchasers set forth in Exhibit A to such agreement (the
"Series D Agreement") including, without limitation, the indemnification


                                      -4-
   35
rights set forth in Section 9.12, and the Purchaser shall obtain the benefit
of, and agrees to be bound by, the applicable terms and conditions of Section 9
of the Series D Agreement as though the Purchaser were a Holder and the Shares
were Registrable Securities under Section 9 of the Series D Agreement.
Attached hereto as Exhibit A is a copy of Section 9 of the Series D Agreement.

         The granting of the foregoing registration rights does not conflict
with any other obligation of the Company.

8.       Governing Law.

         This agreement shall be governed by the laws of the State of
California, without regard to their conflicts of laws provisions.

9.       Counterparts.

         This Agreement may be executed in two or more counterparts, each of
which shall be deemed an original, but all of which together shall constitute
one and the same instrument.

         IN WITNESS WHEREOF, the parties hereto have executed this agreement
as of the day and year first above written.



                                
NEW YORK UNIVERSITY                CALYPTE BIOMEDICAL CORPORATION


By:                                By:
   --------------------------          --------------------------------
                                       David J. Robison, President
Title:                                 and Chief Executive Officer
      -----------------------

Address:
        ---------------------






                                      -5-
   36
                                   EXHIBIT A





                                   SECTION 9

                 RESTRICTIONS ON TRANSFER; REGISTRATION RIGHTS

         9.1     Restrictions on Transfer.  The Securities shall not be sold,
assigned, transferred, or pledged except upon the conditions specified in this
section, which conditions are intended to, among other things, ensure
compliance with the provisions of the Act (as defined herein).  Each Purchaser
shall cause any proposed transferee of the securities held by a Purchaser to
agree to take and hold such securities subject to the provisions and upon the
conditions specified in this Section.

         9.2     Certain Definitions.  As used in this Agreement, the following
definitions shall apply:

         "Act" means the Securities Act of 1933, as amended, or any successor
federal statute and the rules and regulations of the commission thereunder, as
shall be in effect at the time.

         "Commission" means the Securities and Exchange Commission or any other
federal agency at the time administering the Act.

         "Holder" means any holder of outstanding Registrable securities;
provided, however, that for all purposes under this Section, the holder of any
Shares shall be deemed to be the Holder of the Registrable Securities into
which such Shares are then convertible.

         "Initiating Holders" means any Holders of not less than 50% of the
Registrable Securities in the aggregate.


                                     -11-
   37
         The terms "register", "registered" and "registration" refer to a
registration effected by preparing and filing a registration statement in
compliance with the Act (and any post-effective amendments filed or required to
be filed), and the declaration or ordering of the effectiveness of such
registration statement.

         "Registrable Securities" means (i) the Conversion Stock; (ii) shares
of the Company's Common Stock issuable or issued upon conversion of the
Company's Series C Preferred, Stock; (iii) shares of the Company's Common Stock
issuable or issued upon conversion of the Company's Series B Preferred Stock;
(iv) exclusively for purposes of registrations pursuant to Section 9.5 hereof,
up to 43,193 shares of Common Stock issuable to Arthur R. Engel ("Engel"); and
(v) any shares of Common Stock of the Company issued or issuable, directly or
indirectly, in respect of the Conversion Stock, Series C Preferred Stock,
Series B Preferred Stock or such stock issued to Engel, upon any stock split,
stock dividend, recapitalization, or similar event, or any shares of Common
Stock otherwise issued or issuable with respect to such stock; provided,
however, that Registrable Securities shall not include any shares of Common
Stock which have previously been registered or sold to the public, or any
Registrable Securities sold by a person in a transaction in which his rights
under this Section 9 are not assigned.

         "Registration Expenses" means all reasonable expenses incurred by the
Company in complying with Sections 9.5 and 9.6, including, without limitation,
all registration, qualification and filing fees, printing expenses, escrow
fees, fees and disbursements of counsel for the Company, blue sky fees and
expenses, and the expense of any special audits incident to or required by any
such registration (but excluding the compensation of regular employees of the
Company which shall be paid in any event by the Company).  Registration
Expenses shall not include selling commissions, discounts or other compensation
paid to underwriters or other agents or brokers to effect the sale.

         "Restricted Securities" means the securities of the Company required
to bear the legends set forth in Section 9.3.

         9.3      Restrictive Legends.  Each stock certificate representing (i)
the Securities (including the Conversion Stock) or (ii) any other securities
issued in respect of the Securities upon any stock split, stock dividend,
recapitalization, merger, consolidation, or similar event, shall (unless
otherwise permitted by the provisions of Section 9.4) be stamped or otherwise
imprinted with legends in substantially the following form (in addition to any
legend required under applicable state securities laws):

         THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
         REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "ACT").
         THESE SECURITIES HAVE BEEN ACQUIRED FOR INVESTMENT AND


                                     -12-
   38
         NOT WITH A VIEW TO, OR IN CONNECTION WITH, THE DISTRIBUTION THEREOF.
         THESE SECURITIES MAY NOT BE OFFERED, SOLD, PLEDGED, OR TRANSFERRED
         UNLESS (I) A REGISTRATION STATEMENT UNDER THE ACT IS IN EFFECT AS TO
         THESE SECURITIES OR (II) THERE IS AN OPINION OF COUNSEL, SATISFACTORY
         TO THE CORPORATION, THAT AN EXEMPTION THEREFROM IS AVAILABLE.

         COPIES OF THE AGREEMENT COVERING THE PURCHASE OF THESE SECURITIES AND
         RESTRICTING THEIR TRANSFER MAY BE OBTAINED AT NO COST BY WRITTEN
         REQUEST MADE BY THE HOLDER OF RECORD OF THIS CERTIFICATE TO THE
         SECRETARY OF THE CORPORATION AT THE PRINCIPAL EXECUTIVE OFFICES OF THE
         CORPORATION.

         Each Purchaser and holder of any Securities consents to the Company
making a notation on its records and giving instructions to any transfer agent
of the Securities in order to implement the restrictions on transfer described
in this Section.

         9.4     Notice of Proposed Transfers.  Prior to any proposed transfer
of any Restricted Securities, unless there is in effect a registration
statement under the Act covering the proposed transfer, the holder thereof
shall give written notice (the "Notice") to the Company of such holder's
intention to make such transfer.  The Notice shall describe the manner and
circumstances of the proposed transfer in sufficient detail.  The holder shall
also provide to the Company a written opinion of legal counsel who shall be
satisfactory to the Company, addressed to the Company and satisfactory in form
and substance to the Company's counsel, to the effect that the proposed
transfer of the Restricted Securities may be effected without registration
under the Act, provided that no such opinion need be provided with respect to a
transfer to any partner of any Purchaser which is a partnership.  Each stock
certificate evidencing the Restricted Securities so transferred shall bear the
appropriate restrictive legends set forth in Section 9.3, except that such
certificate shall not bear such restrictive legends if in the opinion of
counsel for the Company such legends are not required in order to establish
compliance with any provisions of the securities laws.

         9.5     Company Registration.

                 (a)      Notice of Registration.  If at any time or from time
to time, the Company shall determine, to register any of its securities, either
for its own account or the account of a security holder or holders exercising
their respective demand registration rights, other than (i) a registration
relating solely to employee benefit plans, or (ii) a registration relating
solely to a Rule 145 transaction, the Company shall:

                 (i)      promptly give to each Holder written notice thereof;
and


                                       -13-
   39
                          (ii)    include in such registration (and any related
qualification under blue sky laws or other compliance), and in any underwriting
involved therein, all the Registrable Securities specified in a written request
by each Holder received by the Company within 15 days after the Company mails
such written notice, subject to the provisions below.

                 (b)      Underwriting.  The right of any Holder to
registration pursuant to this Section 9.5 shall be conditioned upon the
participation by such Holder in such underwriting, if any, and the inclusion of
the Registrable Securities of such Holder in the underwriting to the extent
provided herein.  All Holders proposing to distribute their securities through
such underwriting shall (together with the Company and the other holders
distributing their securities through such underwriting) enter into an
underwriting agreement in customary form with the managing underwriter selected
for such underwriting by the Company.  Notwithstanding any other provision of
this Section 9.5, if the managing underwriter determines that marketing factors
require a limitation of the number of shares to be underwritten, the managing
underwriter may limit the Registrable Securities held by Holders, provided that
the number of shares of Registrable Securities and other securities that may be
included in the registration and underwriting shall be allocated among all
Holders and other holders in proportion, as nearly as practicable, to the
respective amounts of securities entitled to inclusion (determined without
regard to any requirement of a request to be included in such registration) in
such registration held by all such Holders and other holders at the time of
filing the registration statement.  To facilitate the allocation of shares in
accordance with the, above provisions, the Company may round the number of
shares allocated to any Holder to the nearest 100 shares.  If any Holder or
other holder disapproves of the terms of any such underwriting, he may elect to
withdraw therefrom by written notice to the Company and the managing
underwriter.  Any securities excluded or withdrawn from such underwriting shall
be withdrawn from such registration.

                 (c)      Right to Terminate Registration.  The Company shall
have the right to terminate or withdraw any registration initiated by it under
this Section 9.5 prior to the effectiveness of such registration whether or not
any Holder has elected to include securities in such registration.

         9.6     Requested Registration.

                 (a)      Request for Registration.  In case the Company shall
receive from Initiating Holders a written request that the Company effect any
underwritten registration, qualification, or compliance with respect to
Registrable Securities held by such Initiating Holders, then the Company shall:


                                     -14-
   40
                          (i)     promptly give written notice of the proposed
registration, qualification, or compliance to all other Holders; and

                          (ii)    as soon as practicable, use its most diligent
efforts to effect all such registration, qualification, or compliance
(including, without limitation, the execution of an undertaking to file
post-effective amendments, appropriate qualification under applicable blue sky
or other state securities laws, and appropriate compliance with applicable
regulations issued under the Act and any other governmental requirements or
regulations) as may be so requested and as would permit or facilitate the sale
and distribution of all or such portion of such Registrable Securities as are
specified in such request, together with all or such portion of the Registrable
Securities of any Holders joining in such request as are specified in a written
request received by the Company within 30 days after receipt of such written
notice from the Company;

         provided, however, that the Company shall not be obligated to take any
action to effect any such registration, qualification, or compliance pursuant
to this Section 9.6:

                                  (A)      in any jurisdiction in which the
Company would be required to execute a general consent to service of process in
effecting such registration, qualification, or compliance unless the Company is
already subject to service in such jurisdiction and except as may be required
by the Act;

                                  (B)      during the period starting with the
date sixty days prior to the Company's estimated date of filing of, and ending
on the date six months immediately following the effective date of, any
registration statement pertaining to securities of the Company (other than a
registration of securities in a Rule 145 transaction or with respect to an
employee benefit plan or initiated by security holders);

                                 (C)      unless the aggregate gross offering
price thereof would be at least $10,000,000; or

                                  (D)      after the Company has effected one
such registration pursuant to this Section 9.6 and such registration has been
declared or ordered effective.

         Subject to the foregoing clauses (A) through (D), the Company shall
file a registration statement covering the Registrable Securities so requested
to be registered as soon as practicable, and in any event within 120 days,
after receipt of the request or requests of the Initiating Holders; provided,
however, that if the Company shall furnish to the Initiating Holders a
certificate signed by the president of the Company stating that in the good
faith judgment of the board of directors of the Company, it would be seriously
detrimental to the Company or its shareholders for such registration


                                     -15-
   41
statement to be filed on or before the date filing would be required and it is
therefore essential to defer the filing of such registration statement, the
Company shall have the right to defer such filing for a reasonable period not
to exceed an additional 120 days.

                 (b)      Underwriting.  The right of any Holder to
registration pursuant to this Section 9.6 shall be conditioned upon such
Holder's participation in such underwriting and the inclusion of such Holder's
Registrable Securities in the underwriting to the extent requested (unless
otherwise mutually agreed by a majority in interest of the Initiating Holders
and such Holder) to the extent provided herein.

         The Company shall (together with all Holders and holders of other
securities proposing to distribute their securities through such underwriting)
enter into an underwriting agreement in customary form with the managing
underwriter selected for such underwriting by a majority in interest of the
Initiating Holders.  Notwithstanding any other provision of this Section 9.6,
if the managing underwriter advises the Initiating Holders in writing that
marketing factors require a limitation of the number of shares to be
underwritten, then the Company shall so advise all Holders and the other
holders distributing their securities through such underwriting, and no other
securities will be included in such registration until all Registrable
Securities requested to be included in such registration have been included
therein and the Registrable securities included in such registration shall be
allocated among all Holders. electing to participate in such registration as
nearly as practicable in proportion to the number of Registrable Securities
held by each such holder.  No Registrable Securities or other securities
excluded from the underwriting by reason of the underwriter's marketing
limitation shall be included in such registration.  To facilitate the
allocation of shares in accordance with the above provisions, the Company or
the underwriters may round the number of shares allocated to any Holder to the
nearest 100 shares.

         If any Holder of Registrable Securities disapproves of the terms of
the underwriting, such person may elect to withdraw therefrom by written notice
to the Company, the managing underwriter and the Initiating Holders.  The
Registrable Securities and/or other securities so withdrawn shall also be
withdrawn from registration, and such Registrable Securities shall not be
transferred in a public distribution prior to 90 days after the effective date
of such registration, or such other shorter period of time as the underwriters
may require.  If by the withdrawal of such Registrable Securities a greater
number of Registrable Securities held by other Holders may be included in such
registration (up to the maximum of any limitation imposed by the underwriters), 
then the Company shall offer to all Holders who have included Registrable
Securities in such underwriting the right to include additional Registrable
Securities in the same proportion and manner used in determining the
underwriter limitation in this Section 9.6(b). If as a result of such
withdrawals, the

                                     -16-

   42
Holders whose Registrable Securities are to be registered do not own a majority
of the outstanding Registrable Securities, then the request for such
registration shall be deemed to have been withdrawn.

         If the managing underwriter has not limited the number of Registrable
Securities to be underwritten, the Company may include securities for its own
account or for the account of others in such registration if the underwriter so
agrees and if the number of Registrable Securities which would otherwise have
been included in such registration and underwriting will not thereby be
limited.

         9.7     Form S-3-Registration.  In case the Company shall receive from
a Holder or Holders a written request that the Company effect a registration on
Form S-3 and any related qualification or compliance with respect to an amount
of the Registrable Securities owned by such Holder or Holders for which the
anticipated aggregate offering price would be at least $1,000,000, the Company
shall:

                 (a)      promptly give written notice of the proposed
registration, and any related qualification or compliance to all other Holders;
and

                 (b)      as soon as practicable, effect such registration and
all such qualifications and compliances as may be so requested and as would
permit or facilitate the sale and distribution of all or such portion of such
Holder's or Holders' Registrable Securities as are specified in such request,
together with all or such portion of the Registrable Securities of any other
Holder or Holders joining in such request as are specified in a written request
given within 15 days after receipt of such written notice from the Company;
provided, however, that the Company shall not be obligated to effect any such
registration, qualification, or compliance pursuant to this Section 9.7: (1) if
Form S-3 is not available for such offering by the Holders; (2) if the Company
shall furnish to the Holders a certificate signed by the president of the
Company stating that in the good faith judgment of the board of directors of
the Company, it would be seriously detrimental to the Company and -its
shareholders for such Form S-3 Registration to be effected at such time, in
which event the company shall have the right to defer the filing of the Form
S-3 registration statement for a period of not more than one hundred twenty
(120) days after receipt of the initiating request of the Holder or Holders
under this Section 9.7; provided, however, that the Company shall not utilize
this right more than once in any twelve (12) month period; (3) if the Company
has, within the six (6) month period preceding the date of such request,
already effected a registration on Form S-3 for the Holders pursuant to this
Section 9.7; or (4) in any jurisdiction in which the Company would be required
to execute a general consent to service of process in effecting such
registration, qualification or compliance unless the Company is already subject
to service in such jurisdiction and except as may be required by the Securities
Act.


                                     -17-
   43
         Subject to the foregoing, the Company shall effect such registration,
qualification, or compliance (including, without limitation, the execution of
an undertaking to file post-effective amendments, appropriate qualification
under applicable blue sky or other state securities laws and appropriate
compliance with applicable regulations issued under the Securities Act and any
other governmental requirements or regulations) covering the Registrable
Securities and other securities so requested to be registered as soon as
practicable after receipt of the request or requests of the Holders.
Registrations effected pursuant to this Section 9.7 shall not be counted as a
request for registration or registrations effected pursuant to Sections 9.5 or
9.6.

         If the registration to be effected pursuant to this Section 9.7 is to
be an underwritten public offering, it shall be managed by an underwriter or
underwriters acceptable to the Company selected by a majority in interest of
the Holders requesting registration.  In such event, the right of any Holder to
registration pursuant to Section 9.7 shall be conditioned upon the
participation by such Holder in such underwriting and the inclusion of the
registrable securities of such Holder in the underwriting to the extent
provided herein.  If the managing underwriter so selected determines that
marketing factors require a limitation of the number of shares to be
underwritten, the managing underwriter may limit the Registrable Securities
held by such Holders to be included in such registration.  The Company shall so
advise such Holders, and the number of shares of Registrable Securities that
may be included in the registration shall be allocated among such Holders in
proportion to the respective amounts of Registrable Securities which would be
held by each of such Holders at the time of filing of the registration
statement.  Any Registrable Securities that are so excluded from the
underwriting shall be excluded from the registration.  As used throughout this
Section, the term "Form S-3" shall be deemed to include any equivalent
successor form for registration pursuant to the Act.

         9.8     Expenses of Registration.

                 (a)      All Registration Expenses incurred in connection with
the registration, qualification or compliance 'pursuant to Sections 9.5 and 9.6
shall be borne by the Company; provided, however, that the Company shall not be
required to pay for expenses of any registration proceeding begun pursuant to
Section 9.6, the request of which has been subsequently withdrawn by the
Initiating Holders, in which case such expenses shall be borne by the
Initiating Holders of securities (including Registrable Securities) requesting
or causing such withdrawal pro rata in accordance with the number of shares
initially sought to be registered; except that if Holders of a majority of the
Registrable Securities so elect, all Registration Expenses relating to any
withdrawn registration initiated under Section 9.6 will be paid by the Company,
and such withdrawn registration shall be counted as


                                     -18-
   44
the one demand registration -to which Holders are entitled under Section 9.6.

                 (b)      All Registration Expenses and selling expenses
incurred in connection with a registration, qualification, or compliance
pursuant to Section 9.7 shall be borne pro rata by the Holder or Holders
requesting the registration on Form S-3 according to the number of Registrable
Securities included in such registration.

         9.9     Letter or Opinion of Counsel in Lieu of Registration.  If in
the opinion of counsel for the Company concurred in by counsel for the Holders,
no registration under the Act is required in connection with the disposition of
the Registrable Securities covered by any request made under Sections 9.5 and
9.6 in the manner in which they propose to dispose of the Registrable
Securities included in such request, the Company need not comply with such
request or requests; provided, however, that the Company shall not be so
relieved of its obligations under Sections 9.5 and 9.6 unless such opinion of
counsel for the Company shall have been mailed by the Company to such Holders
within fifteen (15) days after the Company's receipt of their request or
requests; and provided, further, that if counsel for the Company has opined
that no registration is required in connection with any such disposition, such
counsel shall further opine as to whether the removal of any legend from
certificates representing all shares to which such opinion refers is
permissible, and, if so, the Company shall remove from such certificates all
legends no longer required thereon and shall rescind any stop-transfer
instructions previously communicated to its transfer agent relating to such
shares.

         9.10    Lock-up.  Each Purchaser (or other holder of any Securities)
hereby agrees not to offer, sell, or otherwise dispose of any of the Company's
Common Stock held of record or beneficially owned by such person during such
period, not to exceed 120 days, following the effective date of the
registration statement for the Company's initial underwritten public offering
as is requested by the managing underwriter for such offering, provided that
all officers, directors and holders or 1% or more of the outstanding capital
stock of the Company and all other persons with registration rights are bound
by similar restrictions.  Such restriction shall not apply to shares registered
in such offering.  In order to enforce this provision, the Company may impose
stop-transfer instructions with respect to such shares until the end of such
period.

         9.11    Registration Procedures.  If and whenever the company is
required by the provisions of this Section to use its most diligent efforts to
effect promptly the registration of Registrable Securities, the Company shall:

                 (a)      Prepare and file with the Commission a registration
statement with respect to such Registrable Securities and use its most


                                     -19-
   45
diligent efforts to cause such registration statement to become and remain
effective as provided herein.

                 (b)      Prepare and file with the Commission such amendments
and supplements to such registration statement and the prospectus used in
connection therewith as may be necessary to keep such registration statement
effective and current and to comply with the provisions of the Act with respect
to the sale or other disposition of all Registrable Securities covered by such
registration statement, including such amendments and supplements as may be
necessary to reflect the intended method of disposition of the prospective
seller or sellers of such Registrable Securities, but for no longer than one
hundred eighty (180) days subsequent to the effective date of such registration
in the case of a registration statement on Form S-1 or S-18 (or any similar
form of registration statement required to set forth substantially identical
information) and for no longer than ninety (90) days in the case of a
registration statement on Form S-3.

                 (c)      Furnish to each prospective seller of Registrable
Securities such number of copies of a prospectus, including a preliminary
prospectus, in conformity with the requirements of the Act, and such other
documents, as such seller may reasonably request in order to facilitate the
public sale or other disposition of the Registrable Securities of such seller.

         9.12    Indemnification.  In the event any of the Registrable
Securities are included in a registration statement under this Section:

                 (a)      The Company will indemnify each Holder, each of its
officers and directors and partners and such Holder's separate legal counsel
and independent accountants, and each person controlling such Holder within the
meaning of Section 15 of the Securities Act, and each underwriter, if any, and
each person who controls any underwriter within the meaning of Section 15 of
the Act, against all expenses, claims, losses, damages or liabilities (or
actions in respect thereof), including any of the foregoing incurred in
settlement of any litigation, commenced or threatened, arising out of or based
on any untrue statement (or alleged untrue statement) of a material fact
contained in any registration statement, prospectus, offering circular or other
document, or any amendment or supplement thereto, incident to any such
registration, qualification or compliance, or based on any 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 in
which they were made, not misleading, or any violation by the Company of any
rule or regulation promulgated under the Act applicable to the Company in
connection with any such registration, qualification or compliance, and the
company will reimburse each such Holder, each of its officers and directors and
partners and such Holders' separate legal counsel and independent accountants
and each person controlling such Holder, each such


                                     -20-
   46
underwriter and each person who controls any such underwriter, for any legal
and any other expenses reasonably incurred in connection with investigating,
preparing or defending any such claim, loss, damage, liability or action,
provided that the Company will not be liable in any such case to the extent
that any such claim, loss, damage, liability or expense arises out of or is
based on any untrue statement or omission or alleged untrue statement or
omission, made in reliance upon and in conformity with written information
furnished to the Company by an instrument duly executed by such Holder or
underwriter and stated to be specifically for use therein.

                 (b)      Each Holder will, if Registrable Securities held by
such Holder are included in the securities as to which such registration,
qualification or compliance is being effected, indemnify the Company, each of
its directors and officers and its legal counsel and independent accountants,
each underwriter, if any, of the Company's securities covered by such a
registration statement, each person who controls the Company or such
underwriter within the meaning of Section 15 of the Act, and each other such
Holder, each of its officers and directors and each person controlling such
Holder within the meaning of Section 15 of the Act, against all claims, losses,
damages and liabilities (or actions in respect thereof) arising out of or based
on any untrue statement (or alleged untrue statement) of a material fact
contained in any such registration statement, prospectus, offering circular or
other document, or any omission (or alleged omission) to state therein a
material fact required to be stated therein or necessary to make the statements
therein not misleading, and will reimburse the Company, such Holders, such
directors, officers, persons, underwriters or controlling persons for any legal
or any other expenses reasonably incurred in connection with investigating or
defending any such claim, loss, damage, liability or action, in each case to
the extent, but only to the extent, that such untrue statement (or alleged
untrue statement) or omission (or alleged omission) is made in such
registration statement, prospectus, offering circular or other document in
reliance upon and in conformity with written information furnished to the
Company by an instrument duly executed by such Holder and stated to be
specifically for use therein; provided, however, that the obligations of each
Holder hereunder shall be limited to an amount equal to the proceeds to each
such Holder of Registrable Securities sold as contemplated herein.

                 (c)      Each party entitled to indemnification under this
Section (the "Indemnified Party") shall give notice to the party required to
provide indemnification (the "Indemnifying Party") promptly after such
Indemnified Party has actual knowledge of any claim as to which indemnity may
be sought, and shall permit the Indemnifying Party to assume the defense of any
such claim or any litigation resulting therefrom, provided that counsel for the
Indemnifying Party, who shall conduct the defense of such claim or litigation,
shall be approved by the Indemnified Party (whose approval shall not
unreasonably be withheld), and the Indemnified Party may


                                     -21-
   47
participate in such defense at such party's expense.  No Indemnifying Party, in
the defense of any such claim or litigation, shall, except with the consent of
each Indemnified Party, consent to entry of any judgment or enter into any
settlement which does not include as an unconditional term thereof the giving
by the claimant or plaintiff to such Indemnified Party of a release from all
liability in respect of such claim or litigation.'

                 (d)      If the indemnification provided for in this Section
is held by a court of competent jurisdiction to be unavailable to an
Indemnified Party with respect to any loss, liability, claim, damage or expense
referred to herein, then the Indemnifying Party, in lieu of indemnifying the
Indemnified Party, shall contribute to the amount paid or payable by such
Indemnified Party with respect to such loss, liability, claim, damage or
expense in the proportion that is appropriate to reflect the relative fault of
the Indemnifying Party and the Indemnified Party in connection with the
statements or omissions that resulted in such loss, liability, claim, damage or
expense, as well as any other relevant equitable considerations.  The relative
fault of the Indemnifying Party and the Indemnified Party shall be determined
by reference to, among other things, whether the untrue or alleged untrue
statement of material fact or the omission to state a material fact relates to
information supplied by the Indemnifying Party or by the Indemnified Party, and
the parties-' relative intent, knowledge, access to information and opportunity
to correct or prevent such statement or omission.

         9.13    Information by Holder.  The Holder or Holders of Registrable
Securities included in any registration shall furnish to the Company such
information regarding such Holder or Holders and the distribution proposed by
such Holder or Holders as the Company may request in writing and as shall be
required in connection with any registration, qualification or compliance
referred to in this Section.

         9.1.4   Rule 144 Reporting.  With a view to making available the
benefits of certain rules and regulations of the Commission which may at-any
time permit the sale of the Restricted Securities to the public without
registration, after such time as a public market exists for the.  Common Stock
of the Company, the Company shall use its best efforts to:

                 (a)      Make and keep public information available, as those
terms are understood and defined in Rule 144 under the Act, beginning 90 days
after (i) the effective date of the first registration statement filed by the
Company for an offering of its securities to the general public, (ii) the
Company registers a class of securities under Section 12 of the Securities
Exchange Act of 1934, as amended (the "Exchange Act") , or (iii) the Company
issues an offering circular meeting the requirements of Regulation A under the
Act;


                                     -22-
   48
                 (b)      File with the Commission in a timely manner all
reports and other documents required of the Company under the Act and the
Securities Exchange Act of 1934, as amended (at any time after it has become
subject to such reporting requirements); and

                 (c)      Furnish to any Holder promptly upon request a written
statement as to its compliance with the reporting requirements of Rule 144 (at
any time after-90 days after the effective date of the first registration
statement filed by the Company for an offering of its securities to the general
public) , and of the Act and the Exchange Act (at any time after it has become
subject to such reporting requirements), a copy of the most recent annual or
quarterly report of the Company, and such other reports and documents of the
Company and other information in the possession of or reasonably obtainable by
the Company as a Holder may reasonably request in availing itself of any rule
or regulation of the Commission allowing a Holder to sell any such securities
without registration.

         9.15    Assignment of Registration Rights.  The rights to cause the
Company to register securities granted under this Section may be assigned to a
transferee or assignee in connection with the transfer or assignment of shares
of Registrable Securities only if (i) such shares represent at least 1% of the
outstanding shares of the Company's capital stock (assuming conversion of all
Preferred Stock to Common Stock) on the date of such assignment, or (ii) the
transfer of such shares occurs in a distribution from a Purchaser which is a
partnership to a partner thereof.

         9.16    Amendment of Registration Rights.  The registration rights
provided in this Section may be-Amended with the written consent of the Company
and the holders of 51% of the Registrable Securities.

         9.17    Amendment of Old Agreement.  Holders of the outstanding shares
of Series C Preferred Stock and Series B Preferred Stock hold registration
rights provided under an Agreement for the Purchase and Sale of Series C
Preferred Stock dated as of October 18, 1991, and the Addendum thereto dated as
of February 28, 1992, (collectively, the "Old Agreement").  Section 9.16 of the
Old Agreement provides that Section 9 of the Old Agreement may be amended with
the written consent of the Company and holders of 51% of the "Registrable
Securities," as such term is defined in the Old Agreement.  The Purchasers
include holders of in excess of 51% of such "Registrable Securities." By their
execution hereof, the Company and the Purchasers which have registration rights
under the Old Agreement agree that, effective at the First Closing hereunder,
the rights of holders of "Registrable Securities" under the Old Agreement shall
be superseded in their entirety by the registration rights under Section 9 of
this Agreement.



                                     -23-