EPIX MEDICAL INC
S-1/A, 1997-01-17
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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   As filed with the Securities and Exchange Commission on January 17, 1997
    

   
                                                    Registration No. 333-17581
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                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549
                                -------------

   
                               AMENDMENT No. 1
                                      to
                                   FORM S-1
                            REGISTRATION STATEMENT
                                    Under
                          THE SECURITIES ACT OF 1933
                                -------------
    


                              EPIX Medical, Inc.
            (Exact Name Of Registrant As Specified In Its Charter)

<TABLE>
<CAPTION>
 <S>                             <C>                           <C>
           DELAWARE                          2835                   04-3030815
(STATE OR OTHER JURISDICTION OF  (PRIMARY STANDARD INDUSTRIAL    (I.R.S. EMPLOYER
 INCORPORATION OR ORGANIZATION)   CLASSIFICATION CODE NUMBER)  IDENTIFICATION NUMBER)
</TABLE>

       71 Rogers Street, Cambridge, Massachusetts 02142 (617) 499-1400
             (Address, Including Zip Code, and Telephone Number,
      Including Area Code, of Registrant's Principal Executive Offices)

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

                               MICHAEL D. WEBB
                    President and Chief Executive Officer
                              EPIX MEDICAL, INC.
                               71 Rogers Street
                        Cambridge, Massachusetts 02142
                                (617) 499-1400
          (Name, Address, Including Zip Code, and Telephone Number,
                  Including Area Code, of Agent For Service)
                                -------------

                                  Copies to:
<TABLE>
<CAPTION>
       <S>                                <C>
         WILLIAM T. WHELAN, ESQ.             STEVEN D. SINGER, ESQ.
          Palmer & Dodge LLP                   Hale and Dorr LLP
           One Beacon Street                   60 State Street
       Boston, Massachusetts 02108        Boston, Massachusetts 02109
       (617) 573-0100                          (617) 526-6000
</TABLE>
                                -------------

   Approximate date of commencement of proposed sale to the public: As soon
as practicable after the effective date of this Registration Statement.

   If any of the securities being registered on this Form are to be offered
on a delayed or continuous basis pursuant to Rule 415 under the Securities
Act of 1933, check the following box. [ ]

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

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

   
   If delivery of the prospectus is expected to be made pursuant to Rule 434,
check the following box. [ ]
    
   The Registrant hereby amends this Registration Statement on such date or
dates as may be necessary to delay its effective date until the Registrant
shall file a further amendment which specifically states that this
Registration Statement shall thereafter become effective in accordance with
Section 8(a) of the Securities Act of 1933 or until the Registration
Statement shall become effective on such date as the Commission, acting
pursuant to Section 8(a), may determine.
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<PAGE>




Information contained herein is subject to completion or amendment. A
registration statement relating to these securities has been filed with the
Securities and Exchange Commission. These securities may not be sold nor may
offers to buy be accepted prior to the time the registration statement
becomes effective. This Prospectus shall not constitute an offer to sell or
the solicitation of an offer to buy nor shall there be any sale of these
securities in any State in which such offer, solicitation or sale would be
unlawful prior to registration or qualification under the securities laws of
any such State.

   
                SUBJECT TO COMPLETION, DATED JANUARY 17, 1997
    


PROSPECTUS

                                   [LOGOTYPE]
                                  EPIX MEDICAL

                               2,000,000 Shares
                                 Common Stock

  All of the 2,000,000 shares of Common Stock offered hereby are being sold
by EPIX Medical, Inc. ("EPIX" or the "Company"). Prior to this offering,
there has been no public market for the Common Stock of the Company. It is
currently estimated that the initial public offering price will be between
$9.00 and $11.00 per share. See "Underwriting" for a discussion of the
factors to be considered in determining the initial public offering price.
The Company has applied for quotation of the Common Stock on the Nasdaq
National Market under the symbol EPIX.

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

           The shares offered hereby involve a high degree of risk.
See "Risk Factors" commencing on page 5.

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

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

================================================================================
                     Price to         Underwriting      Proceeds to
                      Public          Discount (1)      Company (2)
- --------------------------------------------------------------------------------
Per Share           $                  $                $
- --------------------------------------------------------------------------------
Total (3)           $                  $                $
================================================================================

(1) See "Underwriting" for indemnification arrangements with the several
    Underwriters.

(2) Before deducting expenses payable by the Company estimated at $700,000.

(3) The Company has granted to the Underwriters a 30-day option to purchase
    up to 300,000 additional shares of Common Stock solely to cover
    over-allotments, if any. If all such shares are purchased, the total
    Price to Public, Underwriting Discount and Proceeds to Company will be $,
    $ and $, respectively. See "Underwriting."

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

  The shares of Common Stock are offered by the several Underwriters subject
to prior sale, receipt and acceptance by them and subject to the right of the
Underwriters to reject any order in whole or in part and certain other
conditions. It is expected that certificates for such shares will be
available for delivery on or about      , 1997, at the office of the agent of
Hambrecht & Quist LLC in New York, New York.

HAMBRECHT & QUIST                                  WESSELS, ARNOLD & HENDERSON

          , 1997

<PAGE>

MS-325: NONINVASIVE CARDIOVASCULAR IMAGING
- --------------------------------------------------------------------------------
[EPIX LOGO]

EPIX Medical, Inc. is developing targeted contrast agents to improve the
capability of magnetic resonance imaging ("MRI") to diagnose a variety of
diseases. The Company's principal product under development, MS-325, is an
injectable vascular contrast agent. The Company believes that MS-325 will
simplify the diagnostic pathway for a number of diseases and in many cases
replace highly invasive and expensive X-ray angiography.

- --------------------------------------------------------------------------------
X-RAY ANGIOGRAPHY

[bullet] X-ray angiography is generally considered to be the definitive
         diagnostic exam for assessing cardiovascular disease.

[bullet] Approximately 3.3 million diagnostic X-ray 
         angiograms are performed annually 
         in the U.S.

[bullet] X-ray angiography is highly invasive,
         painful and expensive.

[bullet] A catheter is fed into the patient 
         through an arterial puncture in the
         groin area to introduce contrast media 
         and enable an X-ray to be taken.

[bullet] Complications from X-ray angiography 
         include renal failure, limb loss
         and death.


[Photograph of x-ray angiography]

[Photograph of x-ray angiography]

- -------------------------------------------------------------------------------
THE EPIX 
SOLUTION

[bullet] EPIX is developing MS-325 to provide
         physicians with a clinically superior, 
         noninvasive and cost-effective  
         diagnostic procedure.

[bullet] The patient receives a single injection 
         of MS-325 in an arm vein and then 
         enters an MRI scanner.

[bullet] MS-325 binds to the blood protein 
         albumin and is designed to be excreted 
         safely through the kidneys over time.

[bullet] A Phase I clinical trial of MS-325 
         commenced in September 1996.

[Photograph of MRI exam]

- --------------------------------------------------------------------------------
MS-325 IS CURRENTLY BEING EVALUATED IN A PHASE I CLINICAL TRIAL AND NEITHER 
MS-325 NOR OTHER CONTRAST AGENTS UNDER DEVELOPMENT HAVE RECEIVED MARKETING 
APPROVAL FROM THE FDA OR ANY FOREIGN REGULATORY BODY. 


   IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR
EFFECT TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE
COMMON STOCK OF THE COMPANY AT A LEVEL ABOVE THAT WHICH MIGHT OTHERWISE
PREVAIL IN THE OPEN MARKET. SUCH TRANSACTIONS MAY BE EFFECTED ON THE NASDAQ
NATIONAL MARKET, IN THE OVER-THE-COUNTER MARKET OR OTHERWISE. SUCH
STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.


                                      2



<PAGE>

HUMAN STUDIES WITH MS-325
- --------------------------------------------------------------------------------
[EPIX LOGO]

EPIX Medical is currently evaluating the safety of MS-325 in a Phase I clinical
trial. The MRI images below were obtained from subjects enrolled in this trial.

- --------------------------------------------------------------------------------
Carotid Arteries

Enhanced right carotid artery showing 
the profile of the human subject.

[Photo: MRI of carotid artery]


- --------------------------------------------------------------------------------
Coronary Arteries


Left:
Cross section of the heart, showing the 
enhanced right coronary artery (arrow).

Top Right:
Three-dimensional computer-rendered 
view of portions of the ascending aorta 
and right coronary artery (arrow).

Bottom Right:
Major coronary arteries in a different 
subject; RCA=right coronary artery, 
LAD= left anterior descending artery, 
LCx= left circumflex artery.

[Photo: MRI of coronary arteries (3 views)]


- -------------------------------------------------------------------------------
Pulmonary Vessels


Enhanced pulmonary arteries and veins 
of the lungs.


[Photo: MRI of pulmonary vessels]

THE IMAGES ABOVE ARE FROM A PHASE I CLINICAL TRIAL OF THE EPIX VASCULAR IMAGING
AGENT, MS-325, AN INJECTABLE CONTRAST AGENT FOR USE IN MAGNETIC RESONANCE
IMAGING. MS-325 IS CURRENTLY BEING EVALUATED IN CLINICAL TRIALS AND HAS NOT
RECEIVED MARKETING APPROVAL FROM THE FDA OR ANY FOREIGN REGULATORY BODY.

<PAGE>


- --------------------------------------------------------------------------------
HUMAN STUDIES WITH MS-325

[Diagram of aorta and renal arteries]


Aorta and Renal Arteries


The renal arteries extend 
from the aorta to the kidneys 
(shown on either side of
the image). The aorta then
bifurcates into the iliac
arteries.


[Photo: MRI of aorta and renal arteries]


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

[Diagram of thigh vessels]

Thigh Vessels


Left:
The left femoral artery (arrow) 
can be viewed at any angle 
from the 3D dataset.

Right:
The femoral artery can be
isolated and displayed using
computer techniques.


[Photo: MRI of thigh vessels]

[Photo: MRI of isolated femoral artery]

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

[Diagram of calf vessels]

Calf Vessels


Left:
Arteries can be seen with 
attendant pairs of veins on 
either side.

Center:
Isolated left tibial arterial 
tree.

Right:
Isolated left saphenous vein.


[Photo: MRI of calf vessels]

[Photo: MRI of isolated tibial artery]

[Photo: MRI of isolated saphenous vein]


- --------------------------------------------------------------------------------
THE IMAGES ABOVE ARE FROM A PHASE I CLINICAL TRIAL OF THE EPIX VASCULAR IMAGING
AGENT, MS-325, AN INJECTABLE CONTRAST AGENT FOR USE IN MAGNETIC RESONANCE
IMAGING. MS-325 IS CURRENTLY BEING EVALUATED IN CLINICAL TRIALS AND HAS NOT
RECEIVED MARKETING APPROVAL FROM THE FDA OR ANY FOREIGN REGULATORY BODY.



<PAGE>


                              PROSPECTUS SUMMARY 

  The following summary is qualified in its entirety by the more detailed 
information and Financial Statements and Notes thereto appearing elsewhere in 
this Prospectus. The Common Stock offered hereby involves a high degree of 
risk. See "Risk Factors." 

                                 The Company 

   
  EPIX Medical, Inc. ("EPIX" or the "Company") is developing targeted contrast 
agents both to improve the capability and expand the use of magnetic 
resonance imaging ("MRI") as a diagnostic tool for a variety of diseases. The 
Company's principal product under development, MS-325, is an injectable 
vascular contrast agent designed for multiple vascular imaging indications, 
including coronary artery disease ("CAD") and peripheral vascular disease 
("PVD"). The Company believes that MS-325 will significantly enhance the 
quality of images and provide physicians with a clinically superior, 
noninvasive and cost-effective method for diagnosing cardiovascular disease. 
The Company further believes that MS-325 will simplify the diagnostic pathway 
for a number of diseases and in many cases replace highly invasive and 
expensive X-ray angiography, which is currently considered the definitive 
diagnostic exam for assessing cardiovascular disease. The Company is 
presently conducting Phase I clinical trials of MS-325, and 35 subjects have 
received MS-325 to date with no clinically significant adverse effects 
reported. 
    

  The Company's objective is to become a worldwide leader in MRI contrast 
agents by pursuing a strategy based on commercializing MS-325 and developing 
new applications for its proprietary technology platform. EPIX has entered 
into strategic alliances with Mallinckrodt Group Inc. ("Mallinckrodt"), the 
fourth largest seller of contrast agents in the world, and Daiichi 
Radioisotope Laboratories, Ltd. ("Daiichi"), an affiliate of the leading 
contrast agent company in Japan, for the development and commercialization of 
MS-325 and other vascular contrast agents. 

   
  The use of MRI has grown steadily over the past 10 years due to reduced cost 
and improved imaging capabilities and now provides an effective diagnostic 
modality for a broad range of applications. MRI manufacturers have improved 
the hardware and software of their systems, reducing the time per procedure 
drastically while significantly enhancing resolution. While MRI is currently 
used extensively to image many organs and tissues in the body, its use in 
imaging the arteries and veins has been limited. Prior attempts to develop 
contrast agents to facilitate the clinical usefulness of MRI for the 
cardiovascular system have had limited success. Unlike most currently 
available cardiovascular contrast agents, which are non-specific, MS-325 is a 
targeted intravascular contrast agent designed to bind to a common blood 
protein, albumin. Because of its affinity for albumin, MS-325 provides the 
image acquisition time and signal strength needed to obtain a high contrast, 
high resolution image of the cardiovascular system. EPIX believes that MS-325 
will lead to significantly expanded use of MRI to diagnose cardiovascular and 
other diseases. 
    

  Cardiovascular disease is a growing worldwide problem. It is estimated that 
approximately 500,000 people in the United States die of CAD each year, 
making it the leading cause of death. PVD affects arteries throughout the 
body, resulting in approximately 600,000 vascular operations, 400,000 strokes 
and 100,000 amputations (primarily related to PVD) each year in the United 
States. Diagnosis of CAD and PVD is currently very complex and expensive, 
requires multiple tests and ultimately relies upon a painful and costly X-ray 
angiogram for a definitive diagnosis. Approximately 3.3 million diagnostic 
X-ray angiograms were performed in the United States in 1995 at an estimated 
cost of $5.9 billion. The Company believes that MS-325, together with 
anticipated hardware and software solutions to problems associated with 
cardiac motion, will enable widespread clinical use of MRI to diagnose CAD. 
The Company also believes that MS-325 will significantly expand the use of 
currently available MRI equipment in diagnosing PVD. If such a product were 
available today, the Company believes that it could eliminate many X-ray 
angiograms and ancillary tests, dramatically improving the current approach 
to the diagnosis of cardiovascular disease. The Company believes, based on 
1995 estimated procedure costs, that savings to the United States healthcare 
system for CAD alone could exceed $2.0 billion. 

   
  MS-325 is a magnetically active, injectable small molecule. It binds to the 
blood protein albumin, remains at high concentrations in the bloodstream 
throughout the MRI exam, and is designed to be excreted safely through the 
kidneys over time. The Company is also investigating additional imaging 
applications for MS-325, including tumor imaging. The Company believes that 
its proprietary technology platform will enable it to create additional 
contrast agents that target particular tissue and fluid types. Research 
efforts are ongoing in the areas of thrombosis and functional brain imaging. 
    

  The Company was incorporated in Delaware in 1988 and commenced operations in 
1992. The Company's principal executive offices are located at 71 Rogers 
Street, Cambridge, Massachusetts, 02142-1118, and its telephone number is 
(617) 499-1400. The Company recently changed its name from Metasyn, Inc. 

                                      3 
<PAGE> 

                                 The Offering 

   
<TABLE>
<S>                                                <C>
Common Stock offered by the Company                2,000,000 shares 

Common Stock to be outstanding after the offering  8,314,740 shares (1) 

Use of proceeds                                    To fund research and development, clinical trials, working 
                                                   capital requirements and other general corporate purposes. 

Proposed Nasdaq National Market Symbol             EPIX 
</TABLE>
    
                        Summary Financial Information 
                    (in thousands, except per share data) 

<TABLE>
<CAPTION>
                                                                                                   Nine Months     
                                     Period from inception      Year Ended      Nine Months           Ended        
                                      (November 29, 1988)        March 31,         Ended          September 30,    
                                       through March 31,    -------------------  December 31,  --------------------
                                              1993            1994      1995       1995 (2)       1995      1996 
                                      --------------------- --------  --------- --------------  --------- --------- 
<S>                                          <C>             <C>       <C>          <C>         <C>        <C>
Statement of Operations Data: 
Revenues                                     $1,000          $1,700    $   412      $   900     $   900    $9,635 
Operating income (loss)                        (311)           (579)    (2,820)      (4,770)     (3,438)    2,471 
Net income (loss)                              (270)           (616)    (2,778)      (4,893)     (3,475)    2,338 
Pro forma: 
 Net income (loss) per share (3)                                                    $ (0.70)               $ 0.30 
 Shares used in per share 
   calculations                                                                       6,973                 7,711 
</TABLE>

   
<TABLE>
<CAPTION>
                                                                 September 30, 1996 
                                                      ------------------------------------------ 
                                                       Actual   Pro Forma (4)   As Adjusted (5) 
                                                      --------- --------------  ---------------- 
<S>                                                    <C>         <C>              <C>
Balance Sheet Data: 
Cash and cash equivalents                              $11,735     $11,735          $29,635 
Working capital                                         10,882      10,882           28,782 
Total assets                                            13,815      13,815           31,715 
Capital lease obligations, less current portion            198         198              198 
Redeemable convertible preferred stock                  17,166          --               -- 
Total stockholders' equity (deficit)                    (5,151)     12,015           29,915 
</TABLE>

- ---------------------- 
(1) Based on the number of shares outstanding at December 31, 1996. Excludes 
    1,277,803 shares of Common Stock reserved for issuance upon the exercise 
    of outstanding options at a weighted average exercise price of $2.30 per 
    share, of which options to purchase 392,933 shares were exercisable, and 
    79,696 shares of Common Stock issuable upon exercise of outstanding 
    warrants at a weighted average exercise price of $3.98 per share. See 
    "Capitalization," "Dilution" and "Description of Capital Stock." 
    

(2) The Company changed its fiscal year end from March 31 to December 31 
    commencing with the fiscal year ended December 31, 1995. 

(3) See Note 2 to Notes to Financial Statements for a description of the 
    calculation of pro forma net income (loss) per share. 

(4) Reflects the automatic conversion of all outstanding shares of preferred 
    stock into shares of Common Stock contemporaneously with the closing of 
    this offering. 

(5) As adjusted to give effect to sale of the 2,000,000 shares of Common 
    Stock offered hereby at an assumed initial public offering price of 
    $10.00 per share and the application of the net proceeds therefrom. See 
    "Use of Proceeds" and "Capitalization." 

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

   
  Except as otherwise noted, all information in this Prospectus (i) reflects a 
1-for-1.5 reverse stock split effected on December 6, 1996, (ii) assumes no 
exercise of the Underwriters' over-allotment option, (iii) reflects the 
conversion of all outstanding shares of preferred stock into an aggregate of 
4,750,289 shares of Common Stock effective upon the closing of this offering 
and (iv) reflects an amendment to the Company's Restated Certificate of 
Incorporation to be effective upon the closing of this offering to create a 
class of authorized but undesignated preferred stock. See "Description of 
Capital Stock," "Underwriting" and Notes to Financial Statements. 
    


                                      4 
<PAGE> 

                                 RISK FACTORS 

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

  Early Stage of Development; No Product Sales to Date. The Company commenced 
operations in 1992 and is a development stage company. The Company currently 
has no products for sale nor is there any guarantee that it will ever have 
marketable products. All of the Company's product candidates are in research 
or development, and no revenues have been generated from product sales. To 
date, the Company has financed its operations through private sales of equity 
securities, equipment lease financings and license payments from its 
strategic partners. To achieve profitable operations, the Company, alone or 
with others, must successfully develop, obtain regulatory approval for, 
introduce, market and sell products. The Company does not expect to receive 
revenue from the sale of any of its product candidates for the next several 
years. There can be no assurance that the Company's product development 
efforts will be successfully completed, that required regulatory approvals 
will be obtained in a timely manner, if at all, that its product candidates 
can be manufactured at an acceptable cost and with acceptable quality or that 
any approved products can be successfully marketed. See "Management's 
Discussion and Analysis of Financial Condition and Results of Operations" and 
"Business." 

  Dependence on MS-325. MS-325 is currently the Company's only product 
candidate in human clinical trials, and there is no guarantee that any of its 
other development projects will yield a product candidate suitable for entry 
into clinical trials. The failure of MS-325 to achieve regulatory approval 
and market acceptance would have a material adverse effect on the Company's 
business, financial condition and results of operations. See "Business--EPIX 
Products and Development Programs." 

  Dependence on MRI Advancements for Cardiac Applications. Existing MRI 
scanners do not have the capability to perform coronary angiography without 
improvements in current MRI hardware and software. The success of cardiac 
applications of MS-325 is therefore dependent on advancements in MRI hardware 
and software. Although several leading MRI manufacturers, academic centers 
and others are developing advanced hardware and software, there can be no 
assurance when, or if, these techniques will enable MS-325 to provide 
clinically relevant images in cardiac indications currently being pursued. 
See "Business--Magnetic Resonance Imaging Background" and "--The EPIX 
Solution--The EPIX Approach to CAD Diagnosis." 

  Uncertainty of Market Acceptance of Technology and Products. The commercial 
success of MS-325 and the Company's other product candidates, when and if 
approved for marketing by the United States Food and Drug Administration (the 
"FDA") and corresponding foreign agencies, will depend on their acceptance by 
the medical community and third-party payors as clinically useful, 
cost-effective and safe. While contrast agents are currently used in an 
estimated 25% of all MRI exams, there are no targeted vascular agents 
approved by the FDA in use. Furthermore, clinical use of MRI for vascular 
imaging has been limited, and use of MRI for cardiac imaging has occurred 
mainly in research. Market acceptance, and thus sales of the Company's 
product candidates, will depend on several factors, including safety, price, 
ease of administration, effectiveness and the rate of adoption of up-to-date 
MRI technology. Market acceptance will also depend on the ability of the 
Company and its strategic partners to educate the medical community and 
third-party payors about the benefits of diagnostic imaging with MRI enhanced 
with the Company's product candidates compared to imaging with other 
modalities. The Company's MRI contrast agents represent a new approach to 
imaging the cardiovascular system ("CVS"), and market acceptance both of MRI 
as an appropriate imaging technique for the CVS and of the Company's product 
candidates is critical to the Company's success. There can be no assurance 
that the Company's product candidates will gain market acceptance. Failure to 
achieve market acceptance would have a material adverse effect on the 
Company's business, financial condition and results of operations. See 
"Business--Business Strategy" and "--Competition." 

  Intense Competition and Risk of Technological Obsolescence. Medical 
technology is subject to intense competition and rapid technological change. 
The Company has many competitors, including pharmaceutical, biotechnology and 
chemical companies, a number of which, including both of the Company's 
strategic partners, are actively developing and marketing products that could 
compete with the Company's product candidates. 


                                      5 
<PAGE> 

Many of these competitors have substantially greater capital and other 
resources than the Company and may represent significant competition for the 
Company. Such companies may succeed in developing technologies and products 
that are more effective or less costly than any of those that may be 
developed by the Company, and such companies may be more successful than the 
Company in developing, manufacturing and marketing products. Furthermore, 
there are several well-established medical imaging modalities that currently 
compete, and will continue to compete, with MRI including X-ray angiography, 
computer assisted tomography ("CT"), nuclear medicine and ultrasound. Other 
companies are actively developing the capabilities of the competing 
modalities to enhance their effectiveness in CVS imaging. There can be no 
assurance that the Company will be able to compete successfully in the future 
or that developments by others will not render MS-325 or the Company's future 
product candidates obsolete or non-competitive or that the Company's 
strategic partners or customers will not choose to use competing technologies 
or products. See "Business--Competition." 

  Dependence on Licensed Technology. The Company and Massachusetts General 
Hospital ("MGH") have entered into a license agreement (the "MGH License") 
pursuant to which the Company is the exclusive licensee to certain 
technology, including certain patents and patent applications, which relates 
to the Company's product candidates, including MS-325. The MGH License 
imposes various commercialization, sub-licensing, royalty and other 
obligations on the Company. Failure of the Company to comply with these and 
other requirements could result in the conversion of the license from being 
exclusive to non-exclusive in nature or termination of the license agreement 
itself. Any such event would have a material adverse effect on the Company's 
business, financial condition and results of operations. See 
"Business--Patents and Proprietary Rights." 

  Dependence on Strategic Partners. The Company is dependent on strategic 
partners for support in product development and the regulatory approval 
process as well as a variety of activities including manufacturing, marketing 
and distribution of its products in the United States and abroad, when and if 
its product candidates are approved for marketing by the FDA and 
corresponding foreign agencies. To date, the Company has entered into two 
strategic alliances: a collaboration agreement with Mallinckrodt to develop 
and commercialize MS-325 and other MRI vascular agents worldwide, excluding 
Japan, and a development and license agreement with Daiichi for the 
development and commercialization of MS-325 in Japan. The Company may not 
receive milestone payments from these alliances should MS-325 fail to meet 
certain performance targets in clinical trials. Further, the Company's 
receipt of revenues from strategic alliances is affected by the level of 
efforts of its partners. There can be no assurance that the Company's 
partners will devote the resources necessary to complete development, and 
commence marketing, of MS-325 in their respective territories, or that they 
will successfully market MS-325. Both Mallinckrodt and Daiichi currently 
manufacture imaging agents for other modalities that will compete against 
MS-325. Mallinckrodt and the Company will share responsibility for setting 
the price of the product worldwide, except Japan, and Daiichi will be 
responsible for setting the product price in Japan. There can be no assurance 
that either Mallinckrodt or Daiichi will do so in a manner that maximizes 
revenues for the Company. In addition, Daiichi has the right to terminate its 
agreement on short notice under certain circumstances, and there is no 
guarantee that it will not exercise this right. The failure of the Company to 
receive milestone payments, a reduction or discontinuance of efforts by the 
Company's partners or the termination of these alliances would have a 
material adverse effect on the Company's business, financial condition and 
results of operations. 

  There can be no assurance that the Company will be successful in entering 
into additional strategic alliances for the development and commercialization 
of future product candidates, nor that these alliances, if entered into, will 
be on terms favorable to the Company or will be successful. If the Company 
were unable to enter into future strategic alliances with capable partners on 
commercially reasonable terms, the development and commercialization of 
future product candidates would be delayed and possibly postponed 
indefinitely. See "Business--Strategic Alliances" and "--Manufacturing." 

  Unproven Safety and Effectiveness of Product Candidates; Uncertainties 
Related to Clinical Trials. The Company's product candidates are in research 
and development and will require additional research and development, 
extensive clinical testing and regulatory approval prior to any commercial 
sales. The Company cannot predict if or when any of its products under 
development will be commercialized. The Company currently has only one 
product candidate, MS-325, in clinical trials. The Company will be required 
to complete successfully clinical trials in the United States to demonstrate 
the safety and efficacy of MS-325, currently in Phase I clinical trials, 
prior to obtaining FDA approval. There can be no assurance that clinical 
trials will be successful, or that they will be completed in a timely manner. 
Although no clinically significant adverse effects from MS-325 in 

                                      6 
<PAGE> 

Phase I clinical trials have been reported to date, results are based on 
preliminary data only, and there can be no assurance that serious side 
effects will not be reported as the clinical trial proceeds. The results from 
early clinical trials may not be predictive of results that will be obtained 
in large scale clinical trials, as a number of companies have suffered 
significant setbacks in advanced clinical trials, even after promising 
results in earlier trials. There can be no assurance that Phase II or Phase 
III clinical trials for MS-325 will be conducted or that such trials, if 
begun, will demonstrate any efficacy or will be completed successfully in a 
timely manner, if at all. The rate of completion of the Company's clinical 
trials is dependent upon, among other things, the rate of patient enrollment. 
Patient enrollment is a function of many factors, including the size of the 
patient population, the nature of the clinical protocol under which MS-325 
will be studied, the proximity of the patient to a clinical site and the 
eligibility criteria for the study. Delays in planned patient enrollment may 
result in increased costs, regulatory filing delays, or both. Furthermore, 
the Company, the FDA or other regulatory authorities may suspend or terminate 
clinical trials at any time. Failure to complete successfully any of its 
clinical trials on a timely basis or at all would have a material adverse 
effect on the Company's business, financial condition and results of 
operations. See "Business--Government Regulation." 

  Uncertainty Regarding Patents and Proprietary Rights. The Company considers 
the protection of its proprietary technologies to be material to its business 
prospects. The Company pursues a comprehensive patent program for its product 
candidates in the United States and in other countries where it believes that 
significant market opportunities exist. The Company owns or has an exclusive 
license to patents and patent applications on the critical aspects of its 
core technology as well as many specific applications of this technology. 
However, the patent positions of pharmaceutical and biopharmaceutical firms 
including the Company generally include complex legal and factual questions. 
There can be no assurance that the issued patents owned or licensed to the 
Company, or any patents that may be issued in the future, will effectively 
protect the Company's technology or provide a competitive advantage. There 
can be no assurance that any of the patents or patent applications owned or 
licensed by the Company will not be challenged, invalidated or circumvented 
in the future. 

  The Company's commercial success will also depend on its ability to operate 
without infringing upon the patents of others in the United States and 
abroad. If any third-party patents are upheld as valid and enforceable in any 
judicial or administrative proceeding, the Company could be prevented from 
practicing the subject matter claimed in such patents, or would be required 
to obtain licenses from the owners of each such patent, or to redesign its 
products or processes to avoid infringement. There are pending or issued 
patents, held by parties not affiliated with the Company, relating to 
technologies used by the Company in the development or use of certain of the 
Company's contrast agents. In particular, the Company is aware of certain 
patents in the United States, Japan and elsewhere owned by or licensed to one 
party that relate to MRI contrast agents and which may cover certain of the 
Company's MRI contrast agents, including MS-325. Mallinckrodt, one of the 
Company's strategic partners, has rights from this third party under those 
patents which the Company and Mallinckrodt believe will permit Mallinckrodt 
to manufacture, market and sell MS-325 and other products developed pursuant 
to the collaboration agreement between the Company and Mallinckrodt were 
MS-325 and those other products to be held to fall within the claims of those 
third-party patents. If the agreement with Mallinckrodt is terminated by 
either party, the Company would likely be required to enter into a strategic 
alliance with another party having a license from this third party or obtain 
a license from this third party directly or from others licensed by this 
third party in order to manufacture, market and sell MS-325 and other 
chelate-based MRI contrast agents. However, there can be no assurance that 
the Company would be able to consummate a strategic alliance with a party 
having this third-party license or obtain licenses from third parties on 
commercially reasonable terms, if at all. The patent rights of this third 
party in Japan will expire in 2002, before such time as the Company presently 
anticipates that Daiichi will have material sales of MS-325 in Japan and, 
therefore, the Company believes that the existence of such patents in Japan 
is unlikely to have a material adverse effect on the Company. However, in the 
event that Daiichi commercializes MS-325 in Japan before 2002, it may be 
required to obtain an appropriate license from this third party or from 
others licensed by this third party, or take other measures to avoid 
infringement of third-party patents, including delaying the commencement of 
product sales. There can be no assurance that the Company's current or future 
activities will not be challenged in the future, that additional patents will 
not be issued containing claims materially constraining the proposed 
activities of the Company, that the Company will not be required to obtain 
licenses from third parties, or that the Company will not become involved in 
costly, time-consuming litigation regarding patents in the field of contrast 
agents, including actions brought to challenge or invalidate the Company's 
own patent rights. See "Business--Patents and Proprietary Rights." 

                                      7 
<PAGE> 

  Many of the Company's competitors are continuing to actively pursue patent 
protection for activities and discoveries similar to the Company's. There can 
be no assurance that these competitors, many of which have substantially 
greater resources than the Company and have made substantial investments in 
competing technologies, will not seek to assert that the Company's products 
or chemical processes infringe their existing patents and/or will not seek 
new patents that claim to cover aspects of the Company's technology. 
Furthermore, patent applications in the United States are maintained in 
secrecy until patents issue, and patent applications in foreign countries are 
maintained in secrecy for a specified period after filing. Publication of 
discoveries in the scientific or patent literature tends to lag behind actual 
discoveries and the filing of related patent applications. In addition, 
patents issued and patent applications filed relating to pharmaceuticals are 
numerous. Therefore, there can be no assurance that the Company is aware of 
all competitive patents, either pending or issued, that relate to products or 
processes used or proposed to be used by the Company. 

  The pharmaceutical and biotechnology industries have been characterized by 
extensive litigation regarding patents and other intellectual property 
rights. Litigation may be necessary to enforce any patents issued to the 
Company and/or determine the scope and validity of others' proprietary 
rights. The Company may have to participate in interference proceedings 
declared by the United States Patent and Trademark Office or by foreign 
agencies to determine the priority of inventions. Any involvement in 
litigation surrounding these issues could result in extensive costs to the 
Company as well as be a significant distraction for management. Such costs 
could have a material adverse effect on the Company's business, financial 
condition and results of operations. 

  The Company also relies upon trade secrets, technical know-how and 
continuing technological innovation to develop and maintain its competitive 
position. The Company typically requires its employees, consultants and 
advisors to execute confidentiality and assignment of inventions agreements 
in connection with their employment, consulting or advisory relationships 
with the Company. There can be no assurance, however, that these agreements 
will not be breached or that the Company will have adequate remedies for any 
breach. Furthermore, there can be no assurance that competitors will not 
independently develop substantially equivalent proprietary information and 
techniques or otherwise gain access to the Company's proprietary technology, 
or that the Company can meaningfully protect its rights in unpatented 
proprietary technology. Several of the Company's management and scientific 
personnel were formerly associated with other pharmaceutical and 
biotechnology companies and academic institutions. In some cases, these 
individuals are conducting research in similar areas with which they were 
involved prior to joining the Company. As a result, the Company, as well as 
these individuals, could be subject to claims of violation of trade secrets 
and similar claims. 

  The Company intends to vigorously protect and defend its intellectual 
property. Costly and time-consuming litigation brought by the Company may be 
necessary to enforce patents issued to the Company, to protect trade secrets 
or know-how owned by the Company, or to determine the enforceability, scope 
and validity of the proprietary rights of others. See "Business--Patents and 
Proprietary Rights." 

  Extensive Government Regulation; No Assurance of Regulatory Approval. The 
Company is subject to extensive governmental regulatory requirements and a 
lengthy approval process for its product candidates. The development and 
commercial use of the Company's product candidates will be regulated by 
numerous federal, state and local governmental authorities in the United 
States, including the FDA and comparable foreign regulatory agencies abroad. 
The nature of the Company's research and development and manufacturing 
processes requires the use of hazardous substances and testing on certain 
laboratory animals. Accordingly, the Company is subject to extensive federal, 
state and local laws, rules, regulations and policies governing the use, 
generation, manufacture, storage, air emission, effluent discharge, handling 
and disposal of certain materials and wastes, as well as the use of and care 
for laboratory animals. Although the Company believes it is in compliance 
with all such laws and maintains policies and procedures to ensure that it 
remains in compliance, there can be no assurance that accidents will not 
happen that would expose the Company to legal risk and/or financial loss. 
Furthermore, there can be no assurance that current laws will not be changed 
or that new laws will not be passed that force the Company to change its 
policies and procedures, an event which could impose significant costs on the 
Company. 

  The regulatory approval process for new MRI contrast agents, including 
required preclinical studies and clinical trials, is lengthy and expensive. 
Although certain employees of the Company have experience in obtaining 
regulatory approvals, the Company itself has only limited experience in 
filing or pursuing applications necessary to gain regulatory approvals. 
Preclinical testing of the Company's product development candidates is 
subject 

                                      8 
<PAGE> 

to Good Laboratory Practices ("GLP") as prescribed by the FDA and the 
manufacture of any products developed by the Company will be subject to Good 
Manufacturing Practices ("GMP") as prescribed by the FDA. There can be no 
assurance that the necessary FDA clearances and subsequent approvals will be 
obtained in a timely manner, if at all. There can be no assurance as to the 
length of the clinical trial period or the number of patients that will be 
required to be tested in the clinical trials in order to establish the safety 
and efficacy of MS-325 or any future product candidates of the Company. The 
Company may encounter unanticipated delays or significant costs in its 
efforts to secure necessary approvals. There can be no assurance, even after 
the performance of clinical trials and the passage of time and the 
expenditure of such resources, that regulatory approval will be obtained for 
MS-325 or any other product candidates that may be developed by the Company. 
The Company's analysis of data obtained from preclinical and clinical 
activities is subject to confirmation and interpretation by regulatory 
authorities which could delay, limit or prevent FDA regulatory approval. 
Future United States legislative or administrative actions also could prevent 
or delay regulatory approval of the Company's product candidates. Even if 
regulatory approvals are obtained, they may include significant limitations 
on the indicated uses for which a product may be marketed. A marketed product 
also is subject to continual FDA and other regulatory agency review and 
regulation. Later discovery of previously unknown problems or failure to 
comply with the applicable regulatory requirements may result in restrictions 
on the marketing of a product or withdrawal of the product from the market, 
as well as possible civil or criminal sanctions. Further, many academic 
institutions and companies conducting research and clinical trials in the MRI 
contrast agent field are using a variety of approaches and technologies. Any 
adverse results obtained by such researchers in preclinical studies or 
clinical trials could adversely affect the regulatory environment for MRI 
contrast agents generally. In addition, if marketing approval is obtained, 
the FDA may require post-marketing testing and surveillance programs to 
monitor the product's efficacy and side effects. Results of these 
post-marketing programs may prevent or limit the further marketing of the 
monitored product. 

  The Company and its strategic partners are also subject to numerous and 
varying foreign regulatory requirements governing the design and conduct of 
clinical trials and the manufacturing and marketing of its products. The 
foreign regulatory approval process may include all of the risks associated 
with obtaining FDA approval set forth above, and there can be no assurance 
that foreign regulatory approvals will be obtained on a timely basis, if at 
all. See "Business--Government Regulation." 

  History of Operating Losses and Accumulated Deficit; Uncertainty of Future 
Profitability. The Company's future financial results are uncertain. The 
Company has experienced significant losses since it commenced operations in 
1992. As of September 30, 1996, the Company had accumulated net losses of 
approximately $6.2 million. These losses have resulted primarily from 
expenses associated with the Company's research and development activities, 
including preclinical and clinical trials, and general and administrative 
expenses. The Company anticipates that its research and development expenses 
will increase significantly in the future and it expects to incur substantial 
losses over at least the next several years. There can be no assurance that 
the Company will ever be able to generate revenues from the sale of products. 
Moreover, even if the Company generates product revenues, there can be no 
assurance that the Company will be able to achieve or sustain profitability. 
The Company's results of operations have varied and will continue to vary 
significantly from quarter to quarter and depend on, among other factors: the 
timing of fees and milestone payments received from strategic partners; the 
formation of new strategic alliances by the Company; the timing of 
expenditures in connection with research and development activities, 
including clinical trials; the timing of product introductions and associated 
launch, marketing and sales activities; and the timing and extent of product 
acceptance for different indications and geographical areas of the world. See 
"Management's Discussion and Analysis of Financial Condition and Results of 
Operations." 

  Future Capital Needs; Uncertainty of Additional Funding. Since inception, 
the Company has funded its operations primarily through private sales of 
equity securities, equipment lease financings and license payments from its 
strategic partners. The Company believes that the proceeds of this offering, 
together with existing cash and cash equivalents, will be sufficient to fund 
its operations through June 1998. The Company believes that it will need to 
raise substantial additional funds for research, development and other 
expenses, through equity or debt financings, strategic alliances or 
otherwise, prior to commercialization of any of its product candidates. The 
Company's future liquidity and capital requirements will depend upon numerous 
factors, including the following: the progress and scope of clinical trials; 
the timing and costs of filing future regulatory submissions; the timing and 
costs required to receive both United States and foreign governmental 
approvals; the cost of filing, 

                                      9 
<PAGE> 

prosecuting, defending and enforcing patent claims and other intellectual 
property rights; the extent to which the Company's products gain market 
acceptance; the timing and costs of product introductions; the extent of the 
Company's ongoing research and development programs; the costs of training 
physicians to become proficient with the use of the Company's products; and, 
if necessary once regulatory approvals are received, the costs of developing 
marketing and distribution capabilities. There can be no assurance that 
additional financing will be available on terms acceptable to the Company, or 
at all. The Company's inability to fund its capital requirements would have a 
material adverse effect on the Company's business, financial condition and 
results of operations. If adequate funds are not available, the Company may 
be required to curtail operations significantly or to obtain funds by 
entering into arrangements with strategic partners or others that may require 
the Company to relinquish rights to certain of its technologies, product 
candidates, products or potential markets. To the extent that additional 
capital is raised through the sale of equity or securities convertible into 
equity, the issuance of such securities could result in dilution to the 
Company's existing stockholders. See "Management's Discussion and Analysis of 
Financial Condition and Results of Operations." 

  Limited Manufacturing Capability. The Company does not have, nor does it 
currently have plans to develop, full-scale manufacturing capability for 
MS-325. While it does manufacture small amounts of MS-325 for research and 
development efforts, the Company intends to rely on Mallinckrodt as the 
primary manufacturer of MS-325 for Phase III clinical trials as well as for 
any future human clinical trials and commercial use. If Mallinckrodt is 
unable to produce MS-325 in adequate amounts and at a reasonable cost or to 
comply with any applicable regulations, including GMP, it could have a 
material adverse effect on the Company's business, financial condition and 
results of operations. Furthermore, should Mallinckrodt fail to fulfill its 
manufacturing responsibilities satisfactorily, the Company could be forced to 
find an alternative manufacturer. There can be no assurance that the Company 
would be able to find such an alternative manufacturer. In the event the 
Company were forced to develop its own FDA-approved full-scale manufacturing 
capability, it would require significant expenditures of capital and 
management attention and resources and could require the Company to obtain a 
license from a third party, and would result in a delay in the approval or 
commercialization of MS-325. There can be no assurance that the Company would 
be able to obtain such a license on commercially reasonable terms, if at all. 
See "Risk Factors--Uncertainty Regarding Patents and Proprietary Rights" and 
"Business--Strategic Alliances" and "--Manufacturing." 

  Dependence on Suppliers. The Company currently procures the raw materials 
for the various components of MS-325 from a broad variety of vendors and, 
wherever possible, maintains relationships with multiple vendors for each 
component. There are a number of components of MS-325 for which the largest 
suppliers may have significant control over the market price due to 
controlling market shares. If any one of the Company's suppliers decided to 
increase prices significantly or reduce quantities of components of MS-325 
available for sale to the Company, it could have a material adverse effect on 
the Company's ability to commercialize MS-325 and on the Company's business, 
financial condition and results of operations. See "Business--Manufacturing." 

  Potential Product Liability Exposure and Insurance. The clinical testing, 
manufacturing and marketing of the Company's product candidates may expose 
the Company to product liability claims, and there can be no assurance that 
the Company will not experience material product liability losses in the 
future. The Company currently has limited product liability insurance for the 
use of its product candidates in clinical research, but there can be no 
assurance that such coverage will continue to be available on terms 
acceptable to the Company or that such coverage will be adequate for 
liabilities actually incurred. The Company does not have product liability 
insurance coverage for the commercial sale of its products but intends to 
obtain such coverage if and when its product candidates are commercialized. 
However, there can be no assurance that the Company will be able to obtain 
adequate additional product liability insurance coverage on acceptable terms, 
if at all. A successful claim brought against the Company in excess of 
available insurance coverage, or any claim or product recall that results in 
significant adverse publicity against the Company, may have a material 
adverse effect on the Company's business, financial condition and results of 
operations. See "Business--Product Liability Insurance." 

  Uncertainty of Adequate Reimbursement. The Company could be adversely 
affected by changes in reimbursement policies of governmental or private 
healthcare payors, particularly to the extent any such changes affect 
reimbursement for procedures in which the Company's product candidates would 
be used. Failure by physicians, hospitals and other users of the Company's 
products to obtain sufficient reimbursement from third- party payors for the 
procedures in which the Company's product candidates would be used or adverse 
changes 

                                      10 
<PAGE> 

in governmental and private third-party payors' policies toward reimbursement 
for such procedures would have a material adverse effect on the Company's 
business, financial condition and results of operations. If the Company 
obtains the necessary foreign regulatory approvals, market acceptance of the 
Company's product candidates in international markets would be dependent, in 
part, upon the availability of reimbursement within prevailing healthcare 
payment systems. Reimbursement and healthcare payment systems in 
international markets vary significantly by country, and include both 
government sponsored health care and private insurance. The Company intends 
to seek international reimbursement approvals, although there can be no 
assurance that any such approvals will be obtained in a timely manner, if at 
all, and failure to receive international reimbursement approvals could have 
an adverse effect on market acceptance of the Company's products in the 
international markets in which such approvals are sought. See 
"Business--Reimbursement." 

  Dependence Upon Key Personnel. The Company's future business and operating 
results depend in significant part upon the continued contributions of its 
key technical and senior management personnel, many of whom would be 
difficult to replace and certain of whom perform important functions for the 
Company beyond those functions suggested by their respective job title or 
description. The Company's future business and operating results also depend 
in significant part upon its ability to attract and retain qualified 
management, operational and technical personnel. Competition for such 
personnel is intense, and there can be no assurance that the Company will be 
successful in attracting or retaining such personnel. Although the Company 
maintains key life insurance on the lives of certain officers, the loss of 
any key employee, the failure of any key employee to perform in his or her 
current position, or the Company's inability to attract and retain skilled 
employees, as needed, could have a material adverse effect on the Company's 
business, financial condition and results of operations. See 
"Management--Executive Officers and Directors." 

  No Public Market; Possible Volatility of Share Price. Prior to this 
offering, there has been no public market for the Common Stock, and there can 
be no assurance that an active trading market will develop or be sustained 
after this offering. The initial public offering price will be determined 
through negotiations among the Company and the representatives of the 
Underwriters based on several factors and may not be indicative of the market 
price of the Common Stock after this offering. The market prices of the 
capital stock of medical technology companies have historically been very 
volatile, and the market price of the shares of Common Stock may be highly 
volatile. The market price of the shares of the Common Stock may be 
significantly affected by factors such as actual or anticipated fluctuations 
in the Company's operating results, announcements of technological 
innovations, new products or new contracts by the Company or its competitors, 
developments with respect to patents or proprietary rights, conditions and 
trends in the pharmaceutical and other technology industries, adoption of new 
accounting standards affecting such industries, changes in financial 
estimates by securities analysts, general market conditions and other 
factors. In addition, the stock market has from time to time experienced 
significant price and volume fluctuations that have particularly affected the 
market prices for the common stock of development stage companies. These 
broad market fluctuations may adversely affect the market price of the Common 
Stock. In the past, following periods of volatility in the market price of a 
particular company's securities, class action securities litigation has often 
been brought against that company. Such litigation, if brought against the 
Company, could result in substantial costs and a diversion of management's 
attention and resources. See "Underwriting." 

  Anti-Takeover Effect of Certain Charter and By-Law Provisions and Delaware 
Law. The Company's Restated Certificate of Incorporation as it is proposed to 
be amended and restated concurrently with the closing of this offering (the 
"Restated Certificate") authorizes the Board of Directors to issue, without 
stockholder approval, up to 1,000,000 shares of preferred stock ("Preferred 
Stock") with voting, conversion and other rights and preferences that could 
adversely affect the voting power or other rights of the holders of Common 
Stock. The issuance of Preferred Stock or of rights to purchase Preferred 
Stock could be used to discourage an unsolicited acquisition proposal. In 
addition, the possible issuance of Preferred Stock could discourage a proxy 
contest, make more difficult the acquisition of a substantial block of the 
Company's Common Stock or limit the price that investors might be willing to 
pay for shares of the Company's Common Stock. The Restated Certificate 
provides for staggered terms for the members of the Board of Directors. A 
staggered Board of Directors and certain provisions of the Company's By-laws 
(the "By-laws") and of Delaware law applicable to the Company could delay or 
make more difficult a merger, tender offer or proxy contest involving the 
Company. The Company, for example, will be subject to Section 203 of the 
General Corporate Law of Delaware which, subject to certain exceptions, 
restricts certain transactions and business combinations between a 
corporation and a stockholder 

                                      11 
<PAGE> 

owning 15% or more of the corporation's outstanding voting stock (an 
"interested stockholder") for a period of three years from the date the 
stockholder becomes an interested stockholder. These provisions may have the 
effect of delaying or preventing a change of control of the Company without 
action by the stockholders and, therefore, could adversely affect the price 
of the Company's Stock. See "Management," "Description of Capital 
Stock--Preferred Stock" and "--Anti-Takeover Measures." 

   
  Control by Directors and Officers. Upon completion of this offering, the 
present directors, executive officers and principal stockholders of the 
Company and their affiliates will beneficially own approximately 67.7% of the 
outstanding Common Stock of the Company. As a result, these stockholders will 
be able to significantly influence corporate actions requiring stockholder 
approval, including the election of directors and approval of significant 
corporate transactions. Such concentration of ownership may have the effect 
of delaying or preventing a change in control of the Company. See "Principal 
Stockholders." 
    

  Broad Discretion of Management to Allocate Offering Proceeds. The Company 
expects to use the net proceeds of this offering for research and development 
and funding of clinical trials in support of regulatory and reimbursement 
approvals and for working capital and general corporate purposes. The Company 
is not yet able to estimate precisely the allocation of the proceeds among 
such uses, and the timing and amount of expenditures will vary depending upon 
numerous factors. The Company's management will have broad discretion to 
allocate the proceeds of this offering and the timing of expenditures. See 
"Use of Proceeds." 

   
  Shares Eligible for Future Sale; Registration Rights. Future sales of Common 
Stock in the public market following this offering could adversely affect the 
market price of the Common Stock. Upon completion of this offering, the 
Company will have 8,314,748 shares of Common Stock outstanding, assuming no 
exercise of options and warrants outstanding on December 31, 1996. Of these 
shares, the 2,000,000 shares sold in this offering (plus any additional 
shares sold upon exercise of the Underwriters' over-allotment option) will be 
freely transferable without restriction under the Securities Act of 1933, as 
amended (the "Securities Act"), unless they are held by "affiliates" of the 
Company as that term is used under the Securities Act and the regulations 
promulgated thereunder. Of the 6,314,740 remaining shares, approximately 
112,357 shares of Common Stock will be eligible for sale under Rules 144 and 
701 under the Securities Act on the ninety-first day after the effectiveness 
of this offering. Stockholders of the Company, holding in the aggregate 
6,202,382 shares of Common Stock, have agreed, subject to certain limited 
exceptions, not to sell or otherwise dispose of any of the shares held by 
them as of the date of this Prospectus for a period of 180 days after the 
date of this Prospectus (the "lock-up period") without the prior written 
consent of Hambrecht & Quist LLC. However, Hambrecht & Quist LLC may in its 
sole discretion and at any time without notice, release all or any portion of 
the securities subject to lock-up agreements. At the end of the 
aforementioned lock-up period, an additional 3,950,721 shares of Common Stock 
(plus approximately 318,638 shares issuable upon exercise of vested options 
and outstanding warrants) will be eligible for immediate resale, subject to 
compliance with Rules 144 and Rule 701 under the Securities Act. An 
additional 2,177,587 shares of Common Stock held by existing stockholders 
will become eligible for sale at various times over a period of less than two 
years and could be sold earlier if the holders exercise any available 
registration rights. The holders of 4,750,289 shares of Common Stock have the 
right in certain circumstances to require the Company to register their 
shares under the Securities Act for resale to the public beginning at the end 
of the lock-up period. If such holders, by exercising their demand 
registration rights, cause a large number of shares to be registered and sold 
in the public market, such sales could have an adverse effect on the market 
price for the Company's Common Stock. If the Company were required to include 
in a Company-initiated registration shares held by such holders pursuant to 
the exercise of their piggyback registration rights, such sales may have an 
adverse effect on the Company's ability to raise needed capital and could 
also have an adverse effect on the market price for the Company's Common 
Stock. In addition, approximately 90 days after the date of this Prospectus, 
the Company expects to file a registration statement on Form S-8 registering 
a total of approximately 1,560,654 shares of Common Stock subject to 
outstanding stock options or reserved for issuance under the Company's stock 
option and stock purchase plans. See "Management--Director Compensation," 
"--Stock Plans," "Description of Capital Stock," "Shares Eligible for Future 
Sale--Registration Rights" and "Underwriting." 
    

  Immediate and Substantial Dilution. Purchasers of the shares of Common Stock 
offered hereby will experience immediate and substantial dilution in the net 
tangible book value of their investment from the initial 

                                      12 
<PAGE> 

public offering price. Additional dilution will occur upon exercise of 
outstanding options and warrants. See "Dilution," "Description of Capital 
Stock--Stock Purchase Warrants" and "Shares Eligible for Future Sale." 

  Absence of Dividends. To date, the Company has neither declared nor paid any 
cash dividends on shares of its Common Stock and does not anticipate paying 
any cash dividends in the foreseeable future. See "Dividend Policy." 

  Forward-looking Statements. This Prospectus contains forward-looking 
statements, which may be deemed to include the Company's plans to continue 
the development and achieve commercial introduction of its product 
candidates. Actual results could differ from those projected in any 
forward-looking statement for the reasons detailed in the other sections of 
this "Risk Factors" section or elsewhere in this Prospectus. 

                                      13 
<PAGE> 

                               USE OF PROCEEDS 

  The net proceeds to the Company from the sale of the 2,000,000 shares of 
Common Stock offered by the Company hereby, at an assumed initial public 
offering price of $10.00 per share, are estimated to be $17,900,000 
($20,690,000 if the Underwriters' over-allotment option is exercised in 
full). The Company expects to use the net proceeds for research and 
development and funding of clinical trials in support of regulatory and 
reimbursement approvals and for working capital and general corporate 
purposes. The Company is not yet able to estimate precisely the allocation of 
the proceeds among such uses, and the timing and amount of expenditures will 
vary depending upon numerous factors. The Company's Board of Directors and 
management retain complete discretion with respect to the allocation of such 
proceeds and the timing of expenditures. Although the Company may use a 
portion of the net proceeds for possible licensing or acquisition of products 
and technologies that are complementary to those of the Company, or 
acquisitions of businesses that are complementary to those of the Company, 
there are no current plans or commitments in this regard. Pending such uses, 
the Company plans to invest the net proceeds in investment grade, 
interest-bearing securities. The Company intends to invest and use the 
proceeds so as not to be considered an "investment company" under the 
Investment Company Act of 1940, as amended. 

   
  The Company believes that the net proceeds from the offering and its 
existing cash and cash equivalents will be sufficient to fund its operations 
through June 1998. Thereafter, the Company may require additional funds to 
support its operating requirements or for other purposes and may seek to 
raise such additional funds through public or private equity financing or 
from other sources. There can be no assurance that additional financing will 
be available at all or that, if available, such financing would be obtainable 
on terms favorable to the Company and would not be dilutive. See "Risk 
Factors--Future Capital Needs; Uncertainty of Additional Funding," "-- Broad 
Discretion of Management to Allocate Offering Proceeds" and "Management's 
Discussion and Analysis of Financial Condition and Results of 
Operations--Liquidity and Capital Resources." 
    

                               DIVIDEND POLICY 

  To date, the Company has neither declared nor paid any cash dividends on 
shares of its Common Stock and does not anticipate paying any cash dividends 
in the foreseeable future. 

                                      14 
<PAGE> 

                                CAPITALIZATION 

   
  The following table sets forth, at September 30, 1996, (i) the actual 
capitalization of the Company, (ii) the pro forma capitalization of the 
Company, giving effect to the conversion upon the closing of the offering of 
6,738,076 shares of Preferred Stock into 4,750,288 shares of Common Stock and 
(iii) the capitalization of the Company on an as adjusted basis to give 
effect to the issuance and sale by the Company of 2,000,000 shares of Common 
Stock (at an assumed initial public offering price of $10.00 per share and 
after deducting underwriting discounts and commissions and offering 
expenses). This table should be read in conjunction with the Financial 
Statements of the Company and the Notes thereto included elsewhere in this 
Prospectus. 


<TABLE>
<CAPTION>
                                                                                   September 30, 1996 
                                                                        -------------------------------------- 
                                                                          Actual     Pro forma    As Adjusted 
                                                                         --------- ------------  -------------- 
                                                                                     (in thousands) 
<S>                                                                       <C>         <C>           <C>
Capital lease obligations, less current portion                           $   198     $   198       $   198 
                                                                         --------- ------------  -------------- 
Series B Redeemable Convertible Preferred Stock, $.01 par value; 
  2,655,138 shares authorized; 2,643,736 shares issued and outstanding 
  actual; none issued and outstanding pro forma and as adjusted             3,961          --            -- 
                                                                         --------- ------------  -------------- 
Series C Redeemable Convertible Preferred Stock, $.01 par value; 
  1,445,536 shares authorized; 1,432,318 shares issued and outstanding 
  actual; none issued and outstanding pro forma and as adjusted             3,234          --            -- 
                                                                         --------- ------------  -------------- 
Series D Redeemable Convertible Preferred Stock, $.01 par value; 
  1,740,002 shares authorized; 1,700,002 shares issued and outstanding 
  actual; none issued and outstanding pro forma and as adjusted             5,071          --            -- 
                                                                         --------- ------------  -------------- 
Series E Redeemable Convertible Preferred Stock, $.01 par value; 
  868,329 shares authorized; 868,329 shares issued and outstanding 
  actual; none issued and outstanding pro forma and as adjusted             4,900          --            -- 
                                                                         --------- ------------  -------------- 
Stockholders' equity deficit (1): 
    Series A Convertible Preferred Stock, $.01 par value; 104,388 
      shares authorized; 93,691 shares issued and outstanding actual; 
      none issued and outstanding pro forma and as adjusted                 1,038          --            -- 
    Common Stock, $.01 par value; 15,000,000 shares authorized; 
      1,539,673 shares issued and outstanding actual; 6,289,969 shares 
      issued and outstanding pro forma; 8,289,969 shares issued and 
      outstanding as adjusted (2)                                              15          63            83 
    Additional paid-in capital                                                 94      18,187        36,067 
    Accretion of dividends on redeemable convertible preferred stock          (63)         --            -- 
    Accumulated deficit                                                    (6,235)     (6,235)       (6,235) 
                                                                         --------- ------------  -------------- 
    Total stockholders' equity (deficit)                                   (5,151)     12,015        29,915 
                                                                         --------- ------------  -------------- 
     Total capitalization                                                 $12,213     $12,213       $30,113 
                                                                         ========= ============  ============== 
</TABLE>

- ---------------------- 
(1) Effective upon the closing of this offering, the Company's Restated 
    Certificate of Incorporation will be further amended and restated to, 
    among other matters, reduce the number of authorized shares of Preferred 
    Stock from 6,813,393 to 1,000,000, none of which will be outstanding upon 
    the closing of the offering. See "Description of Capital Stock--Preferred 
    Stock." 
    

(2) Excludes (i) 1,292,517 shares of Common Stock issuable upon exercise of 
    options outstanding at September 30, 1996 at a weighted average exercise 
    price of $2.20 per share, of which options to purchase 329,330 shares of 
    Common Stock were exercisable, and (ii) 79,696 shares of Common Stock 
    issuable of upon exercise of warrants outstanding at September 30, 1996 
    at a weighted average exercise price of $3.98 per share. See 
    "Management--Stock Plans," "Description of Capital Stock" and Notes 8 and 
    9 to Notes to Financial Statements. 

                                      15 
<PAGE> 

                                   DILUTION 

  As of September 30, 1996, the Company had a pro forma net tangible book 
value of approximately $12.0 million, or $1.91 per share of Common Stock. Pro 
forma net tangible book value per share represents the amount of total 
tangible assets, less total liabilities, divided by the number of shares of 
Common Stock then outstanding after giving effect to the conversion of all 
outstanding shares of Preferred Stock into shares of Common Stock upon the 
completion of this offering. After giving effect to the sale of 2,000,000 
shares of Common Stock offered hereby at an assumed initial public offering 
price of $10.00 per share and after deduction of the estimated underwriting 
discounts and commissions and offering expenses payable by the Company, the 
adjusted pro forma net tangible book value of the Company as of September 30, 
1996 would have been $29.9 million, or $3.61 per share of Common Stock. This 
represents an immediate increase in pro forma net tangible book value of 
$1.70 per share to existing investors and an immediate dilution of $6.39 per 
share of to new investors. The following table illustrates this per share 
dilution: 

<TABLE>
   <S>                                                                            <C>      <C>
   Assumed initial offering price per share                                                $10.00 
     Pro forma net tangible book value per share before the offering              $1.91 
     Increase attributable to new investors                                        1.70 
                                                                                  ------- 
   Adjusted pro forma net tangible book value per share after the offering                   3.61 
                                                                                          --------- 
   Dilution per share to new investors                                                     $ 6.39 
                                                                                          ========= 

</TABLE>

  The following table summarizes on a pro forma basis as of September 30, 1996 
the difference between the number of shares of Common Stock purchased from 
the Company, the total consideration paid and the average price per share 
paid: 

<TABLE>
<CAPTION>
                             Shares Purchased       Total Consideration 
                          ---------------------- ------------------------- 
                                                                            Average Price 
                            Number     Percent       Amount      Percent      Per Share 
                         ------------  --------- --------------  ---------  --------------- 
<S>                        <C>          <C>       <C>             <C>          <C>
Existing stockholders      6,289,969     75.9%    $18,494,711      48.0%       $ 2.94 
New investors              2,000,000     24.1      20,000,000      52.0         10.00 
                         ------------  --------- --------------  ---------  --------------- 
    Total                  8,289,969    100.0%    $38,494,711     100.0% 
                         ============  ========= ==============  ========= 
</TABLE>

  The foregoing computations assume no exercise of warrants or stock options 
outstanding at September 30, 1996, at which date there were 1,292,517 shares 
of Common Stock issuable upon exercise of outstanding options at a weighted 
average exercise price of $2.20 per share, of which options to purchase 
329,330 shares of Common Stock were exercisable, and 79,696 shares of Common 
Stock issuable of upon exercise of outstanding warrants at a weighted average 
exercise price of $3.98 per share. See "Management--Stock Plans" and 
"Description of Capital Stock." 

                                      16 
<PAGE> 

                           SELECTED FINANCIAL DATA 

  The following selected financial data for the period from inception 
(November 29, 1988) through March 31, 1993, the nine months ended December 
31, 1995, and for each of the two years in the period ended March 31, 1995 
are derived from Financial Statements of the Company which have been audited 
by Ernst & Young LLP, independent auditors. The financial statements as of 
December 31, 1995 and March 31, 1995 and the nine months ended December 31, 
1995 and for each of the two years in the period ended March 31, 1995 and the 
report of Ernst & Young LLP relating thereto are included elsewhere herein. 
The financial data for the nine months ended September 30, 1996 and 1995 are 
derived from unaudited financial statements included elsewhere herein. The 
unaudited financial statements include all adjustments, consisting of normal 
recurring accruals, which the Company considers necessary for a fair 
presentation of the financial position and the results of operations for 
these periods. Operating results for the nine months ended September 30, 1996 
are not indicative of the results that may be expected for the entire year 
ending December 31, 1996. The following data should be read in conjunction 
with "Management's Discussion and Analysis of Financial Condition and Results 
of Operations," the Financial Statements, related Notes and other financial 
information included herein. 

<TABLE>
<CAPTION>
                                                                                                    Nine Months      
                                    Period from inception       Year Ended       Nine Months           Ended         
                                     (November 29, 1988)         March 31,         Ended          September 30,     
                                      through March 31,    ---------------------  December 31,  ---------------------- 
                                             1993            1994        1995       1995 (1)        1995       1996 
                                     --------------------- --------- ----------- -------------- ----------- ---------- 
                                                           (in thousands, except per share data) 
<S>                                         <C>             <C>        <C>           <C>          <C>        <C>
Statement of Operations Data: 
Revenues                                    $ 1,000         $1,700     $   412       $   900      $   900    $ 9,635 
Operating expenses: 
 Research and development                      470           1,382       2,407         4,165        2,989     4,952 
 General and administrative                    841             897         825         1,505        1,349     2,212 
                                     --------------------- --------- ----------- -------------- ----------- ---------- 
  Total operating expenses                   1,311           2,279       3,232         5,670        4,338     7,164 
                                     --------------------- --------- ----------- -------------- ----------- ---------- 
Operating income (loss)                       (311)           (579)     (2,820)       (4,770)      (3,438)    2,471 
Interest income (expense), net                  41             (38)         42          (123)         (37)     (133) 
                                     --------------------- --------- ----------- -------------- ----------- ---------- 
Net income (loss)                           $ (270)         $  (617)   $(2,778)      $(4,893)     $(3,475)   $2,338 
                                     ===================== ========= =========== ============== =========== ========== 
Pro forma: 
 Net income (loss) per share (2)                                                     $ (0.70)                $ 0.30 
 Shares used in per share 
   calculations (2)                                                                    6,973                  7,711 
</TABLE>

<TABLE>
<CAPTION>
                                                                March 31,           
                                                     ------------------------------  December 31,    September 30, 
                                                       1993       1994      1995       1995 (1)          1996 
                                                      --------  --------- --------- --------------  --------------- 
                                                                             (in thousands) 
<S>                                                   <C>       <C>        <C>          <C>             <C>
Balance Sheet Data: 
Cash and cash equivalents                             $  114    $ 4,154    $  1,079     $   150         $11,735 
Working capital (deficit)                               (142)     3,574        516       (1,327)         10,882 
Total assets                                           1,118      5,050      2,141        1,211          13,815 
Capital lease obligations, less current portion           13        292        107          342             198 
Redeemable convertible preferred stock                    --      3,941      3,949        3,956          17,166 
Total stockholders' equity (deficit)                     773        200     (2,552)      (7,336)         (5,151) 
</TABLE>

- ---------------------- 
(1) The Company changed its fiscal year end from March 31 to December 31 
    commencing with the fiscal year ended December 31, 1995. 

(2) See Note 2 to Notes to Financial Statements for a description of the 
    calculation of pro forma net income (loss) per share. 

                                      17 
<PAGE> 

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

  The following discussion and analysis should be read in conjunction with 
"Selected Financial Data" and the Company's Financial Statements and Notes 
thereto included elsewhere in this Prospectus. Except for the historical 
information contained herein, the discussion in this Prospectus contains 
certain forward-looking statements that involve risks and uncertainties, such 
as statements of the Company's plans, objectives, expectations and 
intentions. The cautionary statements made in this Prospectus should be read 
as being applicable to all related forward-looking statements wherever they 
appear in this Prospectus. The Company's actual results could differ 
materially from those discussed here. Factors that could cause or contribute 
to such differences include those discussed in "Risk Factors," as well as 
those discussed elsewhere herein. 

Overview 

  The Company was incorporated in 1988. Since commencing operations in 1992, 
the Company has been engaged principally in the research and development of 
its product candidates as well as seeking various regulatory clearances and 
patent protection. The Company has had no revenues from product sales and has 
incurred losses since inception through September 30, 1996 aggregating 
approximately $6.2 million. The Company has received revenues in connection 
with various licensing and collaboration agreements. In August 1996, the 
Company entered into a strategic alliance with Mallinckrodt pursuant to which 
it received $6.0 million in up-front license fees. The agreement provides for 
an additional $2.0 million payment upon the earlier of a specified date or 
the achievement of an MS-325 development milestone. In March 1996, the 
Company entered into a strategic alliance with Daiichi. Under this agreement, 
the Company received $3.0 million in license fees and $5.0 million from the 
sale of Preferred Stock, and is entitled to receive up to $3.3 million in 
future payments based upon the Company's achievement of certain product 
development milestones. 

  The Company reported profitable operating results for the nine-month period 
ended September 30, 1996 due to significant license fees and milestone 
payments received from Mallinckrodt and Daiichi. However, the Company expects 
continued operating losses for the next several years as it incurs expenses 
to support research, development and efforts to obtain regulatory approvals. 

  The Company's initial product candidate, MS-325, is currently the Company's 
only product candidate undergoing human clinical trials. The Company filed an 
Investigational New Drug ("IND") application for MS- 325 in July 1996 and 
initiated Phase I clinical trials in September 1996. 

  In 1995, the Company changed its fiscal year end from March 31 to December 
31. The Company anticipates fluctuation in its quarterly results of 
operations due to several factors, including: the timing of fees and 
milestone payments received from strategic partners; the formation of new 
strategic alliances by the Company; the timing of expenditures in connection 
with research and development activities; the timing of product introductions 
and associated launch, marketing and sales activities; and the timing and 
extent of product acceptance for different indications and geographical areas 
of the world. 

Results of Operations 
Comparison of Nine Months Ended September 30, 1996 and 1995 

  Revenues. Revenues for the nine-month period ended September 30, 1996 were 
$9.6 million as compared to $900,000 for the corresponding period of 1995. 
Revenues for the nine-month period ended September 30, 1996 included $6.0 
million in license fees and approximately $665,000 of development contract 
revenue from Mallinckrodt. Revenues for the period also included $3.0 million 
in license fees (net of 10% foreign withholding tax) received from Daiichi 
for the rights to commercialize MS-325 in Japan. Revenues for the nine-month 
period ended September 30, 1995 consisted entirely of payments received from 
a pharmaceutical company as consideration for an option for certain rights to 
the Company's future contrast agents in Japan. The option expired and the 
rights to the agent were subsequently licensed to a third party. 

  Research and development expenses. Research and development expenses for the 
nine-month period ended September 30, 1996 were $5.0 million as compared to 
$3.0 million for the corresponding period of 1995. This increase was due 
primarily to increased MS-325 development costs associated with the 
commencement of Phase I clinical trials in September 1996. 

                                      18 
<PAGE> 

   
  General and administrative expenses. General and administrative expenses for 
the nine-month period ended September 30, 1996 were $2.2 million as compared 
to $1.3 million for the corresponding period of 1995. The $900,000 increase 
was due to increased personnel costs associated with recruitment and 
compensation of additional senior managers (approximately $235,000) and 
increased expenses for strategic consulting and business development 
activities ($128,000). Significant secondary causes of the increase include 
higher patent costs as well as increased agency fees and legal expenses 
associated principally with the formation of collaborative agreements. In 
addition, general and administrative expenses for the 1996 period included 
$250,000 of nonrecurring expense incurred in connection with the 
restructuring of a liver agent development program which was terminated by 
the Company in 1995. The Company had terminated the program after reassessing 
the anticipated future product development costs under the program measured 
against the size of the potential market for products. As part of a 
negotiated termination of the agreement covering the development program, the 
Company paid the contracting party $250,000 and gave a non-exclusive license 
to the technology developed to date under the program in exchange for royalty 
payments on future sales of products by the contracting party. The Company 
expects total general and administrative expenses to increase as the 
Company's product candidates advance through clinical trials and to eventual 
commercialization. 
    

  Interest income and expense. Interest income for the nine-month period ended 
September 30, 1996 was $140,000 as compared to $63,000 for the corresponding 
period of 1995. This increase was due to higher average cash available for 
investment. Interest expense for the nine-month period ended September 30, 
1996 was $274,000 as compared to $100,000 for the corresponding period of 
1995. This increase was due to higher borrowings under promissory notes and 
bridge loans. 

Comparison of Nine Months Ended December 31, 1995 and Years Ended March 31, 
1995 and 1994 

  Revenues. Revenues for the nine-month period ended December 31, 1995 
consisted of the aforementioned $900,000 received as consideration for an 
option for certain rights to contrast agents which has since expired. Revenue 
for the years ended March 31, 1995 and 1994 of $411,000 and $1.7 million, 
respectively, consisted principally of research and license fees received 
from a Japanese company in connection with a liver agent development program 
which was terminated by the Company in 1995. 

  Research and development expenses. Research and development expenses were 
$4.2 million for the nine-month period ended December 31, 1995 as compared 
to $2.4 million for the year ended March 31, 1995 and $1.4 million for the 
year ended March 31, 1994. The respective year-to-year increases were 
attributable to increased payments to third parties for research studies, 
hiring of additional staff and building the infrastructure required to 
perform research, development and regulatory activities with respect to the 
Company's product candidates, principally MS-325. 

   
  General and administrative expenses. General and administrative expenses 
were $1.5 million for the nine-month period ended December 31, 1995 as 
compared to $825,000 for the year ended March 31, 1995 and $897,000 for the 
year ended March 31, 1994, reflecting the investment in personnel and 
facilities to support the Company's expanded operations. General and 
administrative expenses for the nine-month period ended December 31, 1995 
exceeded those for the year ended March 31, 1995 largely due to increased 
salaries ($150,000) and higher legal costs ($117,000), due principally to the 
formation of various collaborations. Also contributing to the increase were 
increased patent costs attributable to the timing and increased scope of 
patent activities and nonrecurring license fee expense incurred in connection 
with the development of MS-325. General and administrative expenses for the 
year ended March 31, 1994 exceeded those for the year ended March 31, 1995 
due primarily to a finder's fee paid in 1994 to a third party in connection 
with identifying possible collaborative partners for the Company's liver 
agent development program. 
    

  Interest income and expense. Interest income for the nine-month period ended 
December 31, 1995 was $28,000 as compared to $121,000 and $29,000 for the 
years ended March 31, 1995 and 1994, respectively. The decrease in interest 
income for the nine-month period ended December 31, 1995 as compared to the 
prior fiscal period was due to lower average cash available for investment. 
Interest income for the year ended March 31, 1995 increased over the prior 
fiscal year primarily due to higher average invested cash balances resulting 
from the Series B Convertible Preferred Stock financing completed in March 
1994. Interest expense for the nine-month period ended December 31, 1995 was 
$151,000 as compared to $79,000 and $67,000 for the years ended March 31, 
1995 and 1994, respectively. The increased interest expense for the 
nine-month period ended 

                                      19 
<PAGE> 

December 31, 1995 was due primarily to additional interest expense related to 
the convertible promissory notes issued in May and November 1995. 

Liquidity and Capital Resources 

   
  The Company has financed its operations since inception principally through 
the sale of its Preferred Stock, with proceeds therefrom totaling $18.4 
million (including $3.8 million from convertible debt securities that were 
converted to Preferred Stock) and payments aggregating $13.6 million received 
from third parties, including Mallinckrodt and Daiichi, in connection with 
collaboration and license arrangements. In addition, the Company arranged 
capital lease lines under which it has borrowed $1.4 million to date to 
partially fund approximately $2.2 million of capital expenditures. From 
inception through September 30, 1996, the Company has incurred $19.7 million 
of costs attributable to operating activities, including $13.4 million 
related to the research and development of technology and new product 
candidates, including MS-325. 
    

   
  During the nine-month period ended September 30, 1996, operating activities 
provided $2.6 million of cash, as license fees received in connection with 
collaboration agreements more than offset operating expenses during the 
period. During the same period investing activities used $756,000 of cash 
primarily for the purchase of fixed assets, consisting principally of 
laboratory and office equipment. Financing activities during the nine-month 
period ended September 30, 1996 provided $9.8 million of cash primarily in 
the form of net proceeds from the sale of the Company's preferred stock, 
totaling $9.3 million and the issuance of notes payable aggregating $900,000, 
which were subsequently converted into preferred stock of the Company. 
    

   
  Operating activities during the nine-month period ended December 31, 1995 
used $3.5 million in cash primarily for continued spending on research and 
development of MS-325 and for general and administrative expenses. Proceeds 
from a sale leaseback arrangement more than offset capital expenditures 
during the same period; consequently, financing activities provided $136,000 
of cash during the period. Other significant cash flow events during the 
period included $2.7 million of proceeds received from the issuance of 
promissory notes which were subsequently converted in 1996 into preferred 
stock of the Company. 
    

   
  The Company does not anticipate the receipt of license fees from new 
collaboration agreements at any time in the immediate future. Because of 
anticipated spending to support development of MS-325 and new research 
programs, the Company does not expect positive cash flow from operating 
activities for any future quarterly or annual period prior to 
commercialization of MS-325. The Company anticipates continued investments in 
fixed assets, including equipment and facilities expansion to support new and 
continuing research and development programs. The Company intends to seek 
additional debt financing to support any necessary facilities expansion and 
equipment requirements that may occur in the foreseeable future. 
    

   
  Should the Company be unable to negotiate an extension of its existing lease 
or obtain equipment lease financing at reasonable terms, the Company would be 
required to find new facilities, modify its current capital plans, seek 
alternative sources of debt or equity financing or use existing cash to fund 
such expenditures. 
    

   
  The Company has reported only tax losses to date and therefore has not paid 
federal or state income taxes since inception. The Company accounts for 
income taxes under Statement of Financial Accounting Standards No. 109 (FAS 
109). Realization of deferred taxes is dependent on future events and 
earnings, if any, the timing and extent of which are uncertain. Accordingly, 
the benefit of deferred tax assets has been fully reserved as of September 
30, 1996 and 1995. At September 30, 1996, the Company had net operating loss 
carryforwards of approximately $7.8 million available to offset future 
taxable income. These amounts expire at various times through 2010. As a 
result of ownership changes resulting from recent sales of equity securities, 
the Company's ability to use the loss carryforwards is subject to limitations 
as defined in Sections 382 and 383 of the Internal Revenue Code of 1986, as 
amended (the "Code"). The Company currently estimates that the annual 
limitation on its use of net operating losses through May 31, 1996 will be 
approximately $900,000. Pursuant to Section 382 of the Code, the change in 
ownership resulting from this offering and any other future sale of stock may 
limit utilization of future losses in any one year. The Company is also 
eligible for research and development tax credits approximating $300,000 at 
September 30, 1996, which can be carried forward to offset federal taxable 
income. The annual limitation and the timing of attaining profitability may 
result in the expiration of net operating loss and tax credit carryforwards 
before utilization. 
    


                                      20 
<PAGE> 

   
  The Company's principal source of liquidity consists of cash and cash 
equivalents totaling $11.7 million at September 30, 1996. The Company is 
eligible to receive an additional $2.0 million of revenues from Mallinckrodt 
and $3.3 million from Daiichi upon the attainment of certain product 
development milestones. The Company's agreement with Mallinckrodt requires 
Mallinckrodt to fund a portion of the future development costs of MS-325 up 
to a specified maximum amount. The Company expects that its cash needs will 
increase significantly in future periods due to pending and planned clinical 
trials and other increased operating expenses. The Company estimates that the 
net proceeds of this offering and existing cash and cash equivalents will be 
sufficient to meet the Company's capital requirements through June 1998. The 
Company's future capital requirements will, however, depend on many factors, 
including the progress of the Company's research and development programs and 
clinical trials, the time and costs required to gain regulatory approvals, 
the ability of the Company to obtain and retain continued funding from third 
parties under collaborative agreements, the costs of filing, prosecuting and 
enforcing patents, patent applications, patent claims and trademarks, the 
status of competing products and the market acceptance of the Company's 
products, if and when approved. The Company may be required to raise 
substantial additional funds to complete development of any product 
candidate, whether or not it receives milestone payments under its 
collaborations with Mallinckrodt and Daiichi, or to commercialize any 
products if and when approved by the FDA. The Company may be required to 
obtain such additional funds through future public or private sales of equity 
securities, equipment lease financings or through strategic alliances. There 
can be no assurance that additional financing will be available on acceptable 
terms, if at all. 
    


                                      21 
<PAGE> 
                                   BUSINESS 

Overview 

   
  The Company is developing targeted contrast agents both to improve the 
capability and expand the use of MRI as a diagnostic tool for a variety of 
diseases. Contrast agents that are targeted or specific are designed to bind 
to a particular organ or organ system. The Company's principal product under 
development, MS-325, is an injectable vascular contrast agent designed for 
multiple vascular imaging indications, including CAD and PVD. The Company 
believes that MS-325 will significantly enhance the quality of images and 
provide physicians with a clinically superior, noninvasive (i.e., no more 
invasive than a peripheral intravenous injection ("I.V.")) and cost-effective 
method for diagnosing cardiovascular disease. The Company further believes 
that MS-325 will simplify the diagnostic pathway for a number of 
cardiovascular diseases and in many cases replace highly invasive (i.e., more 
invasive than a peripheral I.V. up to and including a surgical procedure) and 
expensive X-ray angiography, which is currently considered the definitive 
diagnostic exam for assessing cardiovascular disease. The Company is 
presently conducting Phase I clinical trials of MS-325, and 35 subjects have 
received MS-325 to date with no clinically significant adverse effects 
reported. The Company has entered into strategic alliances with Mallinckrodt 
and Daiichi for the development and commercialization worldwide of MS-325 and 
other vascular contrast agents. 

  MS-325 is a magnetically active, injectable small molecule. It binds to the 
blood protein albumin, remains at high concentrations in the bloodstream 
throughout the MRI exam, and is designed to be excreted safely through the 
kidneys over time. Because of its affinity for albumin, MS-325 provides the 
image acquisition time and signal strength needed to obtain a high contrast, 
high resolution image of the cardiovascular system. The Company is also 
investigating additional imaging applications for MS-325, including tumor 
imaging. The Company believes that its proprietary technology platform will 
enable it to create additional contrast agents that target particular tissue 
and fluid types. Research efforts are ongoing in the areas of thrombosis 
(blood clots) and functional brain imaging. 
    

Magnetic Resonance Imaging Background 

  In MRI, images are obtained by placing a portion of the patient's body in a 
magnetic field and applying safe, low-energy radio waves. The different 
organs and tissues in the body respond uniquely to the MRI's electromagnetic 
field and these responses are then scanned and converted into a 
three-dimensional image. MRI can easily provide high contrast, high 
resolution images of anatomy deep inside the body. 

   
  The use of MRI, which was developed in the 1970s, has grown steadily over 
the past decade due to declining costs, increased clinical effectiveness, 
reduced exam times and more comprehensive coverage by third-party payors. As 
an example, a standard MRI brain exam, which in 1985 required 60 minutes and 
cost approximately $1,500, now takes only 30 minutes, costs approximately 
half as much and can identify tumors that are over 50% smaller than those 
detectable in 1985. The installed base of MRI scanners in the United States 
grew from fewer than 400 scanners in 1985 to an estimated 3,900 in 1995, 
during which year there were an estimated 8.5 million MRI exams performed. 
    

  Underlying MRI's economic and clinical advancement is the consistent and 
rapid technological progress achieved by MRI equipment manufacturers such as 
General Electric, Siemens and Philips. Over the past 10 years, MRI equipment 
manufacturers have achieved significant improvements in both MRI hardware and 
software while reducing the price of a new machine by more than 35%. The 
primary hardware components in an MRI scanner are the magnet, gradients, 
radio frequency coils and computer processors and memory. Since 1985, 
gradients have quadrupled in speed and power, and enhancements in radio 
frequency coils have improved the signal-to-noise ratio by over 100%. 
Improvements in computer processors, memory and software, including new 
techniques to improve scanning, image processing and motion compensation, 
have been even more dramatic. 

  Images obtained in certain applications of MRI can be enhanced through the 
use of contrast agents. Contrast agents are injected into a vein in the 
patient's arm prior to a scan and are designed to amplify the contrast 
between various tissues, organs and anatomic structures. Currently available 
MRI contrast agents are primarily non-specific gadolinium compounds which 
diffuse throughout the body following injection. They are effective at 
enhancing images of certain tissue types, primarily in the brain and spine, 
but lack the efficacy to be clinically useful for many vascular applications. 
Non-specific contrast agents are used in an estimated 25% of MRI exams and 
their usage has grown approximately 40% over the last four years. 

  MRI has been established as the modality of choice for a broad range of 
indications, including brain tumors, many spinal disorders and knee injuries. 
Nevertheless, MRI has been used sparingly as an imaging modality for the 

                                      22 
<PAGE> 

vascular system due to its limited ability to image arteries and veins in 
patients. In particular, cardiac motion currently precludes MRI of the 
coronary arteries. Several leading MRI manufactures, academic centers and 
others are developing hardware and software solutions to the problem of 
cardiac motion. In both CAD and PVD, clinically significant magnetic 
resonance images of the arterial anatomy are also limited by MRI's inability 
to provide sufficient contrast between the arteries and the surrounding 
tissues. Further, MRI studies using the existing non-specific contrast agents 
are limited by their rapid diffusion out of the vascular system. 
Consequently, many experts believe MRI contrast agents which remain in the 
vascular system for extended periods of time will be necessary to obtain 
sufficient contrast for clinically relevant vascular images. 

The EPIX Solution 

  The Company believes that MS-325, together with the anticipated hardware and 
software solutions to the cardiac motion problem, will enable widespread 
clinical use of MRI to diagnose CAD. The Company also believes that MS-325 
will significantly expand the use of currently available MRI equipment in 
diagnosing PVD. MS-325 has been designed to be used with MRI to provide 
physicians with a clinically superior, noninvasive and cost-effective 
diagnostic pathway by eliminating many X-ray angiograms and ancillary tests. 

   MS-325: Cardiology Indications 

  Background. It is estimated that approximately 500,000 people in the United 
States die of CAD each year, making it the leading cause of death. CAD is 
characterized by the accumulation of plaque on the arterial walls, leading to 
a disruption in blood flow to the heart muscle. This interruption of blood to 
the heart can cause ischemia (lack of oxygen) or infarction (death of heart 
tissue) and result in significant morbidity or death. In order to diagnose a 
patient who exhibits apparent symptoms of CAD, prescribe an effective 
treatment and monitor the results of intervention, a physician often requires 
information on the anatomy and function of the heart and, specifically, the 
coronary arteries. Due, in part, to the lack of cost-effective, noninvasive, 
comprehensive diagnostic imaging procedures, diagnosis of CAD is currently a 
complex and expensive process. Based on independent sources, the Company 
believes that in 1995 over six million patients in the United States 
underwent over 11 million various diagnostic tests for the diagnosis of CAD 
at an estimated cost of approximately $7.0 billion. The Company believes that 
MRI-based cardiac evaluations using MS-325 would simplify the process of 
diagnosing CAD, significantly improving patient outcomes and lowering total 
medical costs. 

   
  Traditional Approach to CAD Diagnosis. The current diagnostic process for 
CAD is complex, expensive and can involve multiple, often inconclusive, 
tests. While the specific diagnostic pathway may vary for any given patient, 
several appointments for multiple diagnostic exams may be necessary prior to 
formulation of a treatment plan. Figure 1 below outlines the traditional 
approach to CAD diagnosis. Percentages included in Figures 1, 2 and 3 below 
are derived both from data compiled by the Company and published by 
independent sources. 
    

       Figure 1--Coronary Artery Disease: Traditional diagnostic pathway
- --------------------------------------------------------------------------------



<TABLE>
<S>            <C>                    <C>               <C>               <C>
                7% Acute/Critical                        60% Drug Therapy
              ----   Ischemia                           ----  or Rule Out
              |                                         |         CAD
              |                       Traditional       |
  Initial     |                       Non-Invasive      |
Chest Pain    |                         Imaging         |                  50%    Drug   
  Workup      |                       o Stress echo-    |                 ---- Therapy or
              |                         cardiogram      |                 |    No Therapy
o EKG         |    Indeterminate                        |                 |
o Exercise    |51%  Non-acute         o Nuclear stress  |                 |27%
  stress test ----  Myocardial   ----   perfusion study |    Coronary     ----  PTCA
              |     Infarction                          |40%  X-ray       |
6.75 Million  |42%                       3.44 Million   ---- Angiography  |
  Patients    ---- Rule Out CAD             Patients                      |23%
                                                             1.38 Million ----  CABG
                                                               Patients   
</TABLE>



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

                                      23 
<PAGE> 

   
  An estimated 6.75 million patients enter the CAD diagnostic pathway in the 
United States after experiencing chest pain or shortness of breath. An 
electrocardiogram ("EKG") is often performed at this stage. Approximately 7% 
of these patients present with severe pain and acute or critical ischemia and 
are immediately triaged for treatment. For the remaining 93%, the physician 
completes a work-up, history and physical exam to determine whether the 
patient exhibits symptoms consistent with CAD and has any of the risk factors 
for CAD, such as smoking, high cholesterol, family history, excess weight, 
diabetes or high blood pressure. A patient with an abnormal EKG or 
significant risk factors will likely be referred to a cardiologist for 
further testing. The cardiologist will typically continue the work-up with an 
exercise stress test. Based on EKG and exercise stress test results, CAD is 
ruled out for approximately 42% of all patients entering the diagnostic 
pathway. For the remaining 51% of all patients, results of the exercise 
stress test are indeterminate and the cardiologist generally will perform a 
stress echocardiogram and/or a nuclear stress perfusion study. Approximately 
60% of patients undergoing these tests receive either drug therapy or no 
further treatment. For the remaining 40% of patients, for whom the stress 
echocardiogram or a nuclear stress perfusion study is positive or 
indeterminate, a coronary X-ray angiogram is often prescribed. Approximately 
50% of the patients who receive coronary X-ray angiograms are either treated 
with drugs or require no therapy. If the coronary X-ray angiogram indicates 
surgically correctable disease, the patient will be scheduled for a 
percutaneous transluminal coronary angioplasty ("PTCA"), a procedure designed 
to enlarge partially blocked arteries, or referred to a cardiac surgeon for a 
coronary artery bypass graft ("CABG"), a surgical procedure designed to 
circumvent a blocked or partially blocked artery or arteries with a vascular 
graft. 
    

  As indicated above, the following tests are generally part of the 
traditional diagnostic pathway for CAD: 

  (bullet) EKGs measure the electrical potential of the heart using several 
           surface electrodes. Varying patterns of monitored electrical 
           activity may indicate heart abnormalities, including ischemic heart 
           disease or a previous heart attack. 

  (bullet) Exercise stress tests measure a patient's ability to exercise 
           without chest pain. For certain patients with extreme results, the 
           test can be used to confirm or exclude the presence of blockages 
           which significantly decrease blood flow and sometimes to prescribe 
           drug therapy. However, for most patients the test is inconclusive. 
           The test provides no information on the anatomy of the coronary 
           arteries. 

  (bullet) Stress echocardiograms use transthoracic ultrasound to measure 
           motion of the walls of the heart under physical or pharmacological 
           stress. In most cases, a lack of blood flow to a particular area of 
           the heart will be reflected in atypical motion of the heart wall. 
           The test is noninvasive and costs between $300 and $900. While a 
           normal stress echocardiogram usually eliminates the possibility of 
           blockages which significantly decrease blood flow, the test is 
           often inconclusive and provides no information on the anatomy of 
           the coronary arteries. Over 800,000 stress echocardiograms were 
           performed in the United States in 1995 at an estimated cost of over 
           $250 million. 

  (bullet) Nuclear stress perfusion studies, which measure the flow of blood 
           to cardiac tissue, can be used either as the critical diagnostic 
           test prior to X-ray angiography or to confirm the impact on blood 
           flow of an intermediate blockage identified through X-ray 
           angiography. These tests are noninvasive, use small quantities of 
           ionizing radiation and cost between $600 and $1,400. A patient is 
           injected with a radiopharmaceutical and then a gamma camera is used 
           to detect uptake of the agent in the heart muscle. A deficiency in 
           blood flow to particular regions of the heart is shown on the 
           resultant images. While the test can identify the effects of CAD, 
           it provides no information on the anatomy of the coronary arteries 
           and it cannot determine the location of blockages. Approximately 
           2.7 million nuclear stress perfusion studies were conducted in the 
           United States in 1995 at an estimated cost of $1.9 billion. 

  (bullet) Coronary X-ray angiography is currently considered by many to be 
           the definitive diagnostic exam for imaging the coronary artery 
           anatomy. It uses conventional X-ray technology enhanced with 
           iodinated contrast media. Coronary X-ray angiography is highly 
           invasive and costs between $2,000 and $6,000 per procedure. The 
           procedure requires an interventional cardiologist to puncture the 
           femoral artery in the patient's groin area and feed a catheter up 
           into the patient's heart. During X-ray imaging, up to 100 
           milliliters of contrast media are injected into the catheter, 
           effectively replacing blood flow in the heart and associated 
           arteries for approximately two seconds. This cardiac 
           catheterization must be performed in a surgical setting and 
           requires patient monitoring for at least six hours after the 
           procedure. 

                                      24 
<PAGE> 

           Approximately 5% of patients undergoing a coronary X-ray angiogram 
           experience serious side effects, including renal failure, limb loss 
           and death, which may be caused by both the insertion of the 
           catheter and the high dosage of iodinated radio-opaque dye. In 
           addition, coronary X-ray angiography does not always provide 
           sufficient information for clinical decision-making. While the 
           procedure identifies the location of arterial blockages, in many 
           cases it cannot conclusively determine their impact on blood flow. 
           Therefore, for many blockages, a nuclear stress perfusion study 
           must be performed to enable the physician to make a definitive 
           diagnosis. Due to the expensive nature of coronary X-ray 
           angiography, its high risk of complications, and the fact that 
           approximately 50% of the patients undergoing coronary X-ray 
           angiograms ultimately are diagnosed as having conditions that do 
           not warrant invasive therapy, physicians employ a battery of tests 
           to triage patients in an effort to avoid this procedure. However, 
           because a diagnostic coronary X-ray angiogram is currently the only 
           test that can image the coronary artery anatomy, approximately 1.4 
           million such procedures were performed in the United States in 1995 
           at an approximate cost of $3.8 billion. 

   
  The EPIX Approach to CAD Diagnosis. The Company believes that MS-325, 
coupled with anticipated advances in software and hardware for MRI equipment, 
will enable physicians to use cardiac MRI to perform a noninvasive, 
integrated cardiac exam for the diagnosis of CAD. Such a procedure is 
designed to provide information on coronary artery anatomy, including 
location of arterial blockages, perfusion and cardiac function, in one 
sitting early in the diagnostic pathway. Because the procedure is intended to 
provide physicians with more comprehensive diagnostic information at an 
earlier stage of the diagnostic pathway, physicians will be able to make a 
more informed diagnosis, and arrange for appropriate patient treatment, 
sooner than would otherwise be possible, thereby achieving better patient 
outcomes at a lower cost. Although several leading MRI manufacturers, 
academic centers and others are developing advanced hardware and software, 
there can be no assurance when, or if, these techniques will enable MS-325 to 
provide clinically relevant images in cardiac indications currently being 
pursued. See "Risk Factors--Dependence on MRI Advancements for Cardiac 
Applications." Figure 2 below outlines the EPIX approach to the diagnosis of 
CAD. 
    

           Figure 2--Coronary Artery Disease: EPIX diagnostic pathway
- --------------------------------------------------------------------------------


<TABLE>
<S>            <C>                    <C>               <C>               <C>
                7% Acute/Critical                        80%  Drug Therapy
              ----   Ischemia                           ---- or Rule Out CAD
              |                                         |                 
              |                       EPIX Solution     |
  Initial     |                        MS-325/MRI       |
Chest Pain    |                                         | 9% Coronary
  Workup      |                       o Anatomy         ----  X-ray       ---- CABG
              |                                         |    Angiography  
o EKG         |    Indeterminate      o Perfusion       |                 
o Exercise    |51%  Non-acute                           |    0.31 Million 
  stress test ----  Myocardial   ---- o Function        |      Patients   
              |     Infarction                          |11%              
6.75 Million  |42%                    3.44 Million      ---- PTCA         
  Patients    ---- Rule Out CAD         Patients
</TABLE>


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

  The Company believes that the use of MS-325 with MRI to perform integrated 
cardiac exams will simplify and improve the diagnostic work-up for CAD by 
enabling noninvasive cardiologists (approximately 80% of all cardiologists) 
to visualize the coronary arteries noninvasively early in the work-up. Under 
the EPIX approach for CAD assessment, a patient who has an indeterminate EKG 
and exercise stress test would be referred for a noninvasive, integrated 
cardiac exam. Unlike the invasive nature of coronary X-ray angiography, the 
patient would receive a single injection of MS-325 in a vein in the arm prior 
to the exam and then enter the MRI scanner. The exam is expected to provide 
the physician with three-dimensional anatomic detail of the coronary arteries 
as well as the perfusion and functional information currently provided by 
stress echocardiograms and nuclear stress perfusion studies. Based on the 
results of the MS-325-based integrated cardiac exam, the cardiologist 

                                      25 
<PAGE> 

   
would either prescribe no treatment, prescribe drug therapy or refer the 
patient to an interventional cardiologist (i.e., a cardiologist who performs 
invasive procedures) for a PTCA or surgical planning for a CABG. Because the 
MRI exam using MS-325 is expected to provide all of the anatomic information 
currently provided by a coronary X-ray angiogram, the need for coronary X-ray 
angiography as a diagnostic tool will be reduced. Only in the limited number 
of cases where CABG is deemed necessary would the patient be subjected to 
invasive coronary X-ray angiography for surgical planning. 
    

  The Company believes that the EPIX simplified diagnostic pathway could 
result in significant cost savings to the United States healthcare system for 
the diagnosis of CAD. These savings are predicated on providing noninvasive 
coronary artery anatomic information earlier in the CAD work-up. In 1995, for 
the approximately 3.44 million patients in the United States completing the 
traditional diagnostic pathway, the total cost of the diagnostic work-up for 
CAD was approximately $5.4 billion. Under the EPIX approach to diagnosis of 
CAD, both stress echocardiograms and nuclear stress perfusion studies could 
be eliminated. In addition, because an MRI exam with MS-325 is expected to 
provide physicians with anatomic information early in the CAD work-up, the 
Company believes that half of the patients who undergo coronary X-ray 
angiography but do not ultimately require invasive therapy will be able to 
avoid a coronary X-ray angiogram. The estimated total cost for the 3.44 
million patients completing the EPIX diagnostic pathway for CAD would be $3.2 
billion, yielding approximately $2.2 billion in savings to the United States 
healthcare system based on estimated 1995 procedure costs. 

             Figure 3--Estimated Savings: Traditional CAD diagnostic
                     pathway versus EPIX diagnosit pathway
- --------------------------------------------------------------------------------



Traditional

                   60% Drug Therapy
   $500           ----  or Rule Out
                  |         CAD
Traditional       |
Non-Invasive      |
  Imaging         |                  50%    Drug   
o Stress echo-    |                 ---- Therapy or
  cardiogram      |                 |    Rule Out CAD
                  |                 |
o Nuclear stress  |     $2,700      |27%
  perfusion study |    Coronary     ----  PTCA
                  |40%  X-ray       |
                  ---- Angiography  |
                                    |23%
  3.44 Million                      ----  CABG
    Patients              
                     1.38 Million 
                       Patients   

      Estimated Total U.S. Cost = $5.4 billion



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



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



EPIX

                   80%  Drug Therapy
                  ---- or Rule Out CAD
   $700           |                 
EPIX Solution     |
 MS-325/MRI       |     $2,700
                  | 9% Coronary
o Anatomy         ----  X-Ray       ---- CABG
                  |    Angiography  
o Perfusion       |                 
                  |    0.31 Million 
o Function        |      Patients   
                  |11%              
3.44 Million      ---- PTCA         
  Patients

   Estimated Total U.S. Cost = $3.2 billion



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



  Post-Intervention Monitoring and "Relooks." The Company believes that, after 
either a PTCA or a CABG, optimal patient management would include follow-up 
exams to determine re-forming of blockages ("restenosis") as well as proper 
functioning of grafts. However, while it is estimated that approximately 
400,000 PTCAs and 500,000 CABGs were performed in the United States in 1995, 
only a small proportion of the patients undergoing these procedures received 
follow-up coronary X-ray angiography ("relooks"). Due to the risk, discomfort 
and expense associated with coronary X-ray angiography, follow-up imaging 
currently is limited, which can lead to increased patient management costs 
and poorer outcomes due to undiagnosed restenosis and other complications. 
The Company believes that the availability of MS-325 may lead to an increase 
in follow-up exams using MRI. Furthermore, the Company believes that MS-325 
would enable noninvasive cardiologists to visualize the coronary arteries of 
the increasing number of patients who have been treated with thrombolytic 
therapy (streptokinase and TPA). 

                                      26 
<PAGE> 

   MS-325: Radiology Indications 

  Background. PVD affects arteries throughout the body and results in 
significant morbidity and mortality. There are approximately 600,000 vascular 
operations, 400,000 strokes and 100,000 amputations (primarily related to 
PVD) each year in the United States. Similar to CAD, blockage of arteries 
outside the heart can lead to ischemia (lack of oxygen) or infarction (death 
of tissue). Complications from PVD include pain, limitations in mobility, 
amputation of the extremities, hypertension, kidney failure in the case of 
renal arteries, or stroke in the case of carotid or cerebral arteries. The 
need for imaging the vascular system outside the heart extends to many areas 
of the body, including the carotid arteries, vessels of the leg, the aorta 
and pulmonary arteries. 

   
  Traditional Approach to PVD Diagnosis. A patient with PVD may present with a 
wide range of symptoms, such as leg pain, gangrene, hypertension, renal 
failure, stroke or transient ischemic attack ("TIA"), a brief episode of 
cerebral ischemia usually characterized by blurred vision, slurred speech, 
numbness or paralysis. The appropriate initial diagnostic tests vary 
according to the particular PVD indication. Traditional imaging modalities 
for diagnosing PVD, such as ultrasound, nuclear medicine and CT, frequently 
do not provide definitive diagnostic information. For example, ultrasound and 
renal nuclear scans have poor image quality, leading to exams which are 
frequently indeterminate. CT can be used for certain radiological 
applications, but can only image a limited area during each scan due to the 
large amounts of potentially toxic X-ray contrast media required. 
    

  With the exception of imaging carotid arteries, MRI has not made a 
significant impact on the diagnosis of PVD to date. Non-contrast MRI studies 
of the vascular system, which measure blood flow and not anatomy, are often 
ineffective when used in patients with disease because of their limitations 
in imaging the blood flow associated with PVD, which may be either minimal or 
turbulent. Even for the imaging of carotid arteries, where flow-based MRI has 
had a substantial clinical impact, the lack of direct anatomic data limits 
its ability to provide a quantitative measurement of stenosis required for 
accurate diagnosis. MRI studies using existing non-specific contrast agents 
are limited by the rapid diffusion of the agents out of the vascular system. 

  As with the diagnostic work-up of CAD, a peripheral X-ray angiogram is 
generally considered to be the definitive diagnostic exam for radiological 
indications. In the work-up of PVD of the lower extremities, for example, the 
patient typically presents with leg pain, gangrene or limited mobility. The 
surgeon checks the patient's pulse in the ankles and performs two noninvasive 
exams, impedance plethysmography and ankle brachial index measurements, which 
confirm that the patient has PVD and often localizes the disease within the 
limb. An ultrasound exam is sometimes performed at this stage. Peripheral 
X-ray angiography is then performed to visualize the extent of the disease 
and to plan for surgery. Like coronary X-ray angiograms, peripheral X-ray 
angiograms are performed in a surgical setting and involve the puncture of 
the femoral artery in the groin area, the placement of a catheter in the 
artery and the replacement of blood by X-ray contrast media. While peripheral 
X-ray angiograms have slightly lower morbidity rates compared to coronary 
X-ray angiograms, the risks are significant with complications, including 
limb loss and renal failure, occurring at a rate of 1.7%. The cost of 
peripheral X-ray angiography is estimated to range from less than $1,000 to 
almost $3,000 per procedure. Despite the drawbacks of peripheral X-ray 
angiography, approximately 1.9 million of these procedures were performed in 
the United States in 1995. Figure 4 below outlines the traditional diagnostic 
pathway for various forms of PVD. 

                                      27 
<PAGE> 

     Figure 4--Peripheral Vascular Disease: Traditional diagnostic pathway
- --------------------------------------------------------------------------------



<TABLE>
<S>                         <C>                              <C>              <C>
          Anatomic Area           Current Diagnostic Exams

- ----------------------                   
Carotid                            Ultrasound              
Artery                ----            MRI              ----|             |
- ----------------------                                     |             |
                                                           |             |
- ----------------------                                     |             |
Aorta                 ----            CT                   |             ----   Surgery
- ----------------------             Ultrasound          ----|             |
                                                           | Peripheral  |
- ----------------------                                     |   X-ray     |
Renal                          Renal nuclear scan          | Angiography |
Arteries              ----         Ultrasound          ----|             |    Percutaneous
- ----------------------                                     |             ---- Transluminal
                                                           |             |    Angioplasty
- ----------------------             Impedance               |             |       (PTA)
Extremities           ----    plethysmography (IPG)        |             |
- ----------------------      Ankle Brachial Index (ABI) ----|             |
                        |          Ultrasound              
                        |
                        |
                        |
          [GRAPHIC OF HUMAN BODY]
</TABLE>



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

   
  The EPIX Approach to PVD Diagnosis. The Company believes that the use of 
MS-325 with MRI will simplify and improve the PVD diagnostic pathway by 
enabling radiologists to visualize peripheral arteries noninvasively early in 
the work-up with resolution sufficient to provide a definitive diagnosis and 
surgical plan. Although several available MRI contrast agents also provide 
high resolution, they diffuse out of the cardiovascular system rapidly, 
making it possible to obtain detailed anatomic images only over a limited 
area. MS-325 is designed to remain in the blood vessels for over an hour 
providing sufficient time for detailed images of large portions of the 
vascular system. By significantly increasing the contrast of the vascular 
system and using the MRI equipment currently in widespread use, the Company 
believes that MS-325 will enable MRI to overcome the principal problem that 
has limited its clinical effectiveness in diagnosing PVD. 
    

  An MRI exam utilizing MS-325 is intended to provide sufficient anatomic 
detail for a definitive diagnosis and the anatomic data necessary for 
surgical planning. Unlike peripheral X-ray angiography which, due to its 
invasive and painful nature, high cost and risk of complications, is often 
deferred in favor of noninvasive, often inconclusive exams, an MRI exam 
utilizing MS-325 is intended for use early in the PVD work-up. Phase I 
clinical trials, although not completed, have yielded measurements of signal 
intensity over time consistent with the Company's belief that MRI with MS-325 
will provide physicians with diagnostic information clinically equivalent to 
peripheral X-ray angiography earlier in the diagnostic pathway. Consequently, 
the Company believes that MS-325-based MRI exams would not only replace a 
large portion of the approximately 1.9 million peripheral X-ray angiograms 
performed in the United States each year, but would also be used in a 
significant number of instances where ultrasound, nuclear medicine or other 
noninvasive modalities are currently employed but lack definitive diagnostic 
capability as described above. Based upon estimated 1995 procedure costs, the 
Company believes that the use of MS-325 with MRI to diagnose PVD could yield 
savings to the United States healthcare system of nearly $1.0 billion. 

  Thrombosis is another vascular disease outside the heart that is diagnosed 
with a variety of radiological imaging techniques. Commonly referred to as 
"blood clots," thrombosis can occur in the legs, arms, pelvis, lungs 

                                      28 
<PAGE> 

   
and neck, and is the cause of over 400,000 deaths per year in the United 
States. Blood clots can cause death from a pulmonary embolus (an obstruction 
in the pulmonary vasculature), stroke or heart attack. Ultrasound and nuclear 
stress perfusion studies are used early in the work-up in an attempt to defer 
peripheral X-ray angiography because of cost, mortality and complications. 
These noninvasive modalities are often indeterminate. Although limited in use 
because of the mortality and complication rate, peripheral X-ray angiography, 
as in PVD, continues to be considered by many to be the definitive diagnostic 
tool. The Company believes that an MRI exam using MS-325 will be able to 
noninvasively provide diagnostic information which is clinically equivalent 
to peripheral X-ray angiography for the diagnosis of blood clots in selected 
cases. 
    

Business Strategy 

  The Company's objective is to become a leader in MRI contrast agents. It 
will seek to do so by pursuing a strategy based on commercializing MS-325 and 
developing new applications for its proprietary technology platform. The 
Company's key business objectives are to: 

  Establish the safety and clinical utility of MS-325 for multiple vascular 
imaging indications. The Company is conducting Phase I clinical trials to 
establish the safety of MS-325 for human use, after which it intends to 
conduct Phase II and Phase III clinical trials for multiple cardiology and 
radiology indications. The Company intends to conduct the clinical trial 
programs for cardiology and radiology indications concurrently to the extent 
possible. 

  Achieve market acceptance of MS-325.  The Company intends to collect 
pharmacoeconomic and clinical data that demonstrates that MRI enhanced with 
MS-325 is superior to the traditional diagnostic pathway. Through its 
strategic partners' extensive worldwide marketing and sales networks, the 
Company intends to present this data to both physicians and third-party 
payors. The Company believes that third-party payors will promote the use of 
MS-325 because of its potential for substantial cost savings and clinical 
benefits. 

  Broaden the use of MS-325 to additional clinical indications. The Company 
intends to evaluate MS-325 for use in the diagnosis of various tumors. For 
example, the Company is currently planning a Phase II clinical trial for the 
use of MS-325 in the diagnosis of breast cancer. Based on the physical 
properties of MS-325 and preclinical studies, the Company believes that 
MS-325 has potential application as part of a noninvasive imaging procedure 
that would enable physicians to discriminate between malignant and benign 
breast masses in patients with indeterminate mammograms or palpable lumps. 

  Develop new targeted MRI contrast agents. In addition to evaluating the use 
of MS-325 in diagnosing thrombosis, the Company is developing 
thrombosis-specific MRI contrast agents based on its proprietary technology 
platform. The Company is also pursuing a discovery program for functional 
brain imaging. 

  Maximize the value of strategic alliances. The Company currently has 
strategic alliances with Mallinckrodt and Daiichi. The Company entered into 
these alliances, and will seek to enter into future strategic alliances with 
pharmaceutical and imaging agent industry leaders, in order to obtain access 
to resources and infrastructure to leverage the Company's strengths. 

Technology 

   Background 

   
  The products under development by the Company are based upon its proprietary 
biophysics technology platform. The Company's product candidates are small 
molecule chelates (soluble metal-organic complexes) containing a magnetically 
active metal element which elicit a strong MRI signal and are designed to be 
safely excreted through the kidneys over time. The Company has developed 
significant expertise in the design, synthesis and characterization of 
metal-containing complexes for in vivo use. While the contrast agents 
primarily used in MRI today are non-targeted in that they diffuse 
indiscriminately throughout the tissues of the body, the Company believes 
that its proprietary technology platform will enable it to design contrast 
agents which are capable of targeting specific tissues or organs by binding 
to particular proteins. The Company's proprietary biophysics technology 
platform consists of two key elements: 
    

   Receptor-Induced Magnetic Enhancement 

  Receptor-induced magnetic enhancement ("RIME") technology, which was 
developed by Dr. Randall Lauffer, the Company's founder, while at 
Massachusetts General Hospital ("MGH"), allows targeting of a 

                                      29 
<PAGE> 

contrast agent to particular tissue and fluid types in the body while 
simultaneously multiplying the signal enhancing effect of the agent and is 
now exclusively licensed by the Company under patents held by MGH. RIME 
technology involves the design of metal complexes that bind to particular 
proteins and receptor molecules in the body. This binding causes increased 
concentration and retention of the contrast agent in the specific tissues and 
fluids that contain targeted receptor molecules. The binding also causes a 
special magnetic effect based on the complex biophysics of MRI contrast 
agents. One of the factors that determines an MRI contrast agent's signal 
enhancing effect is its rotation, or tumbling rate, in solution. When an 
agent binds to a large molecule through the RIME process, the agent's 
tumbling rate decreases substantially, resulting in a corresponding increase 
in the strength of the agent's magnetic signal, which is detectable by MRI. 

   Enzyme Sensing Technology 

  Developed by EPIX scientists, enzyme sensing technology is an extension of 
the RIME technology that allows MRI to probe biological events on the 
molecular level for the first time, thereby increasing the sensitivity of 
MRI. The Company is developing small molecule contrast agents that become 
active in the presence of certain enzymes which allows them to bind to their 
target receptor molecules and express their full RIME signal enhancement. 
Because the presence of elevated levels of particular enzymes occur only in 
certain biological situations, enzyme sensing technology would allow MRI to 
scan for specific biological events currently undetectable with MRI. 

EPIX Products and Development Programs 

   MS-325 

  The Company's lead product candidate, MS-325, is a targeted vascular 
contrast agent intended for use with MRI. MS-325 is a gadolinium-based small 
molecule chelate, engineered with the Company's proprietary RIME technology. 
Animal studies have demonstrated that, when injected into the bloodstream, 
MS-325 binds reversibly to the blood protein albumin and is designed to be 
excreted safely through the kidneys over time. This allows the agent to 
remain at high concentrations in the bloodstream during the imaging procedure 
and then be gradually excreted from the body. The Company has designed the 
half-life of the agent to allow for the optimal imaging window of at least 
one hour. In animal studies, MS-325 has exhibited signal enhancement that is 
significantly stronger than currently available agents. In an image enhanced 
by MS-325 using standard MRI techniques, the blood, which is infused with 
gadolinium, gives off a strong magnetic signal and appears bright while the 
surrounding tissue gives off a very low magnetic signal and appears dark. 

  While MS-325 is based on the Company's proprietary technology platform, its 
chemical composition is similar to currently available MRI contrast agents 
which have a strong safety record and are known to cause few, if any, side 
effects. Furthermore, due to the increased magnetic signal elicited by 
MS-325, the Company expects it to be used at a similar or lower dose than 
currently available MRI contrast agents. As a result of these factors, the 
Company believes that MS-325 will have a safety profile comparable to 
currently available MRI contrast agents. 

  The Company submitted an IND application for MS-325 to the FDA on July 22, 
1996 and commenced a Phase I clinical trial on September 6, 1996. Thirty-five 
subjects participated in the clinical safety monitoring portion of the trial, 
which ended on November 22, 1996. Eighteen of these subjects, who were 
divided into three different dosing groups, participated in a typical Phase I 
safety study in which the dose of MS-325 was gradually increased from one 
group to the next. The remaining 17 subjects, who received the highest dose 
tested, were also imaged in order to confirm the appropriateness of the dose 
and to evaluate the imaging characteristics of MS-325. Vital signs, blood 
chemistries and other biological and physical markers were monitored in all 
subjects. Based on preliminary results, no clinically significant adverse 
effects have been reported. The Company anticipates that the final audit of 
the Phase I data will be completed by February 1997. Assuming successful 
completion of the Phase I clinical trial, the Company intends to conduct 
concurrent but separate Phase II and Phase III clinical trials for different 
cardiology and radiology indications. 

  In addition to the diagnosis of CAD and PVD, the Company intends to pursue 
the use of MS-325 for additional clinical indications, including thrombosis, 
commonly referred to as "blood clots." The Company believes that MRI with 
MS-325 could eliminate the need for selected ultrasound and nuclear medicine 
studies of thrombosis while providing, noninvasively, diagnostic information 
which is clinically equivalent to that provided by peripheral X-ray 
angiography. 

  The Company further believes that, based on the physical properties of 
MS-325 and preclinical studies, MS- 325 has potential application as part of 
a noninvasive imaging procedure that would enable physicians to 

                                      30 
<PAGE> 

discriminate between malignant and benign breast masses in patients with 
indeterminate mammograms or palpable lumps. Another potential application for 
MS-325 in the diagnosis of breast cancer is in defining the size of malignant 
lesions. The Company believes that an MRI breast exam using MS-325 could 
allow better determination of eligibility for breast-conserving therapy. 

   Other Research and Development Programs 

   
  Thrombosis Imaging. The Company is developing new agents designed 
specifically for imaging blood clots. The Company is seeking to develop a 
targeted contrast agent and protocol that would enable MRI to illuminate 
blood clots against a dark background. The Company believes that its 
proprietary technology platform could also enable MRI to differentiate old 
and new clot formations and that such a product would change the diagnostic 
pathway for many of the conditions associated with thrombotic disease, 
including pulmonary embolism and deep vein thrombosis. The Company believes 
that use of the new approach would lead to better medical outcomes due to 
earlier definitive diagnosis. Early diagnosis is especially important for 
clots in the pelvis and vena cava, the large vein through which blood returns 
to the heart, because of their increased likelihood of migrating to the lungs 
where the clots can be fatal. The Company believes that a thrombosis-specific 
contrast agent could largely replace the noninvasive modalities currently in 
use, including nuclear medicine ventilation/ perfusion scans. 
    

  Functional Brain Imaging. Functional brain imaging involves measuring small 
changes in the brain to, in effect, "watch" the brain function in real time. 
In the past, these cognitive function mapping studies were done using 
modalities such as electro-encephalograms and nuclear medicine, both of which 
are generally recognized to have low resolution and provide limited clinical 
information. Recently however, investigators at a number of institutions, 
including MGH, have developed a new brain imaging technique using MRI. Even 
in its present experimental form, the technique is rapidly being adopted by 
many leading neuroscience centers throughout the world. The technique detects 
small increases in blood volume or flow that accompany the greater metabolic 
activity in stimulated brain regions, thus allowing one to watch, in real 
time, different regions of the brain "light up" as a person thinks, moves or 
views objects. At present, studies are being conducted using a specialized 
MRI technique which does not employ a contrast agent. However, these studies 
are currently difficult to interpret since blood flow changes induced by 
cognitive activity are subtle and associated signals are weak. Clinical 
applications of functional brain imaging are potentially broad, including 
pre-surgical planning, neurodegenerative disease diagnosis and psychiatry. 

  EPIX is currently conducting preclinical testing of prototype brain imaging 
agents with researchers at MGH based on the Company's proprietary technology 
platform. The Company is seeking to establish the feasibility of developing 
an agent that would be able to magnify the signal from small volume changes 
in blood flow to particular areas of the brain. The Company believes that 
such a contrast agent could enable highly illuminated three-dimensional MRI 
scans of brain function. 

Strategic Alliances 

  The Company's strategy includes entering into alliances with leaders in the 
pharmaceutical and diagnostic imaging industries to facilitate the 
development, manufacture, marketing, sale and distribution of its products. 
To date, the Company has formed strategic alliances with Mallinckrodt and 
Daiichi for the development and commercialization of MS-325. See "Risk 
Factors--Dependence on Strategic Partners." 

   Mallinckrodt Group Inc. 

  Pursuant to a collaboration agreement between the Company and Mallinckrodt, 
which was executed in August 1996, the Company granted Mallinckrodt an 
exclusive license to develop and commercialize MS-325 worldwide, excluding 
Japan. The agreement also provides for potential collaboration and cost 
sharing arrangements in connection with future MRI vascular agent programs, 
whether developed by the Company or Mallinckrodt or in-licensed by either 
party. The operations of the collaboration are supervised by a joint steering 
committee comprised of an equal number of representatives of both parties. 
Mallinckrodt and the Company will collaborate on the clinical development of 
MS-325, beginning with Phase I clinical trials. The Company has primary 
responsibility for conducting Phase I and Phase II clinical trials and for 
manufacturing MS-325 for such trials. Mallinckrodt will assume primary 
responsibility for development and manufacturing starting with Phase III 
clinical trials. Mallinckrodt will also be responsible for the marketing and 
distribution of MS-325 worldwide, excluding Japan. The agreement imposes 
certain development due diligence obligations on both of the parties and 
certain marketing due diligence obligations on Mallinckrodt. 

                                      31 
<PAGE> 

  The Company received a $6.0 million license fee upon execution of the 
agreement with Mallinckrodt. The agreement provides for an additional $2.0 
million payment upon the earlier of a specified date or the achievement of an 
MS-325 milestone. Mallinckrodt and the Company will share in the worldwide, 
excluding Japan, development and manufacturing scale-up and product launch 
costs of MS-325 and all future MRI vascular agents which may be covered by 
the agreement. The parties' current obligations with respect to MS-325 
development costs are limited to a specified amount. Under the arrangement, 
the Company will share in future operating profits, if any. 

  The agreement provides that Mallinckrodt may not develop, market or sell any 
MRI vascular agent worldwide except Japan other than those that are part of 
the collaboration without the approval of the joint steering committee (in 
which case they, if approved, would become part of the collaboration). 

   Daiichi Radioisotope Laboratories, Ltd. 

  Pursuant to a development and license agreement, which was entered into in 
March 1996, the Company granted Daiichi an exclusive license to develop and 
commercialize MS-325 in Japan. Under this arrangement, Daiichi will assume 
primary responsibility for clinical development, regulatory approval, 
marketing and distribution of MS-325 in Japan. The Company retained the right 
and obligation to manufacture MS-325 for development activities and 
commercial sale under the agreement. However, Daiichi may, under certain 
circumstances, elect to formulate MS-325 purchased from the Company into a 
final product. The agreement imposes certain development due diligence 
obligations on both parties and marketing due diligence obligations on 
Daiichi. The agreement may be terminated by Daiichi upon 30 days prior 
written notice if Daiichi determines in its reasonable opinion that MS- 325 
lacks clinical efficacy, presents serious side effects or otherwise exhibits 
unacceptable properties. In connection with this strategic alliance, the 
Company received an up-front fee from Daiichi in the amount of $3.0 million 
and Daiichi is required to make future payments to EPIX up to an aggregate 
amount of $3.3 million, upon the achievement of certain MS-325 development 
milestones. Daiichi also made a $5.0 million equity investment in the 
Company. Daiichi will make royalty payments to the Company on net sales of 
MS-325 in Japan. 

  In 1992, the Company entered into an agency agreement with Sumitomo 
Corporation ("Sumitomo") whereby the Company engaged Sumitomo as its 
exclusive agent to assist the Company in entering into arrangements with 
third parties for the development and commercialization of vascular, liver 
and tumor MRI agents in Japan. Sumitomo assigned this agreement to Summit 
Pharmaceuticals International Corporation ("Summit") in 1995. In accordance 
with the agreement, the Company paid Summit a specified percentage on all 
amounts received by the Company from Daiichi to date and will make payments 
to Summit on future milestone payments it receives from Daiichi, if any. The 
Company will be obliged to make such payments with respect to future 
arrangements with partners headquartered in Japan if entered into prior to 
the first anniversary of the termination of the agency agreement. 

Competition 

  The healthcare industry is characterized by extensive research efforts and 
rapid technological change, and there are many companies that are working to 
develop products similar to the Company's. There are currently no 
FDA-approved targeted vascular contrast agents for use with MRI. However, 
there are a number of non- specific MRI agents approved for marketing in the 
United States and certain foreign markets that are likely to compete with the 
Company's products for certain applications. Magnevist(R) by Schering-AG, 
Dotarem(R) by Guerbet, S.A., Omniscan(R) by Nycomed Imaging ASA, and 
ProHance(R) by Bracco S.p.A. are all such products. The Company is aware of 
other agents under development that may have application in vascular imaging. 
There can be no assurance that the Company's competitors will not succeed in 
the future in developing products that are more effective than any that are 
being developed by the Company. The Company believes that its ability to 
compete within the MRI contrast agent market is dependent on a number of 
factors, including the success and timeliness with which it completes FDA 
trials, the breadth of applications, if any, for which it receives approval, 
and the effectiveness, cost, safety and ease of use of the Company's products 
in comparison to the products of the Company's competitors. The success of 
the Company will also be based on physician acceptance of MRI as a primary 
imaging modality for certain cardiovascular and other applications. See "Risk 
Factors-- Uncertainty of Market Acceptance of Technology and Products." 

  The Company has many competitors including pharmaceutical, biotechnology and 
chemical companies, a number of which, including both of the Company's 
strategic partners, are actively developing and marketing 

                                      32 
<PAGE> 

products that, if commercialized, would compete with the Company's product 
candidates. Many of these competitors have substantially greater capital and 
other resources than the Company and may represent significant competition 
for the Company. Such companies may succeed in developing technologies and 
products that are more effective or less costly than any of those that may be 
developed by the Company, and such companies may be more successful than the 
Company in developing, manufacturing and marketing products. Furthermore, 
there are several well-established medical imaging modalities that currently 
compete, and will continue to compete, with MRI, including X-ray angiography, 
CT, nuclear medicine and ultrasound. Other companies are actively developing 
the capabilities of the competing modalities to enhance their effectiveness 
in CVS imaging. There can be no assurance that the Company will be able to 
compete successfully in the future or that developments by others will not 
render MS-325 or the Company's future product candidates obsolete or 
non-competitive or that the Company's collaborators or customers will not 
choose to use competing technologies or products. 

Patents and Proprietary Rights 

  EPIX considers the protection of its proprietary technologies to be material 
to its business prospects. The Company pursues a comprehensive patent program 
in the United States and in other countries where it believes that 
significant market opportunities exist. 

  The Company owns or has exclusively licensed patents and patent applications 
on the critical aspects of its core technology as well as many specific 
applications of this technology. EPIX has exclusively licensed two patents in 
the United States broadly covering RIME technology, albumin binding with 
metal chelates, and liver targeting metal chelates, and has received notice 
of allowance for similar patent applications in Japan and Europe. The Company 
has exclusively licensed four additional patents in the United States and 
received notice of allowance of an additional U.S. patent covering novel 
metal chelates, with similar patent applications in Japan and Europe. 
Finally, the Company has patent applications pending in the United States, 
Japan and Europe covering various aspects of its RIME technology. The 
Company's patent protection for MS-325 currently extends to 2007 in the 
United States, Japan and Europe. If the currently pending patent applications 
issue, this protection will be extended until 17 years after the date of 
issue in the United States, and until 2016 in Europe and Japan. 

  An issued patent grants to the owner the right to exclude others from 
practicing inventions claimed therein. In the United States, a patent filed 
before June 8, 1995 is enforceable for 17 years from the date of issuance or 
20 years from the deemed date of filing the underlying patent applications, 
whichever is longer. Patents based on applications filed from June 8, 1995 
expire 20 years from the deemed date. The General Agreement on Tariffs and 
Trade provides that patents whose applications were filed on or after June 8, 
1995 are effective for 20 years from filing. This new rule is generally 
regarded as unfavorable to pharmaceutical companies, where the time period 
between patent filing and commercialization of the patented product may be 
extended many years because of the lengthy development cycle and regulatory 
process. 

  The patent positions of pharmaceutical and biopharmaceutical firms involve 
complex legal and factual questions. There can be no assurance that the 
Company's issued patents, or any patents that may be issued in the future, 
will effectively protect the Company's technology or provide a competitive 
advantage. There can be no assurance that any of the Company's patents or 
patent applications will not be challenged, invalidated or circumvented in 
the future. 

  The Company's commercial success will also depend on its ability to operate 
without infringing upon the patents of others in the United States and 
abroad. If any third-party patents are upheld as valid and enforceable in any 
judicial or administrative proceeding, the Company could be prevented from 
practicing the subject matter claimed in such patents, or would be required 
to obtain licenses from the patent owners of each such patent, or to redesign 
its products or processes, to avoid infringement. There can be no assurance 
that such licenses would be available or, if available, would be available on 
terms acceptable to the Company or that the Company would be successful in 
any attempt to redesign its products or processes to avoid infringement. 
Accordingly, an adverse determination in a judicial or administrative 
proceeding or failure to obtain necessary licenses could prevent the Company 
from manufacturing and selling its products, which would have a material 
adverse effect on the Company's business, financial condition and results of 
operations. 

  There are pending or issued patents, held by parties not affiliated with the 
Company, relating to technologies used by the Company in the development or 
use of certain of the Company's product candidates. In particular, 

                                      33 
<PAGE> 

the Company is aware of certain patents in the United States, Japan and 
elsewhere owned by or licensed to one party that relate to MRI contrast 
agents and which may cover certain of the Company's MRI product candidates, 
including MS-325. Mallinckrodt, one of the Company's partners, has rights 
from this third party under those patents which the Company and Mallinckrodt 
believe will permit Mallinckrodt to manufacture, market and sell MS-325 and 
other products developed pursuant to the collaboration agreement between the 
Company and Mallinckrodt were MS-325 and those other products to be held to 
fall within the claims of those third-party patents. If the agreement with 
Mallinckrodt is terminated by either party, the Company would be required to 
enter into a strategic alliance with another party having a license from this 
third party or obtain a license from this third party directly or from others 
licensed by this third party in order to manufacture, market and sell MS- 325 
and other chelate-based MRI contrast agents. However, there can be no 
assurance that the Company would be able to consummate a strategic alliance 
with a party having this third-party license or obtain a license on 
commercially reasonable terms, if at all. The patent rights of this third 
party in Japan will expire in 2002, before such time as the Company presently 
anticipates that Daiichi will have material sales of MS-325 in Japan and, 
therefore, the Company believes that the existence of such patents in Japan 
is unlikely to have a material adverse effect on the Company. However, in the 
event that Daiichi commercializes MS-325 in Japan before 2002, it may be 
required to obtain an appropriate license or take other measures to avoid 
infringement of the third party patents, including delaying the commencement 
of product sales. There can be no assurance that the Company's current or 
future activities will not be challenged, that additional patents will not be 
issued containing claims materially constraining the proposed activities of 
the Company, that the Company will not be required to obtain licenses from 
third parties, or that the Company will not become involved in costly, 
time-consuming litigation regarding patents in the field of contrast agents, 
including actions brought to challenge or invalidate the Company's own patent 
rights. At the same time, the Company is aware of certain products under 
development by the third party referred to above and others which it believes 
may infringe certain of the Company's exclusively licensed patents. The 
Company intends to pursue license or cross-license arrangements with or, if 
necessary and appropriate, infringement proceedings against, these parties 
upon their seeking final regulatory approval for the marketing and sale of 
any such products. See "Risk Factors--Uncertainty Regarding Patents and 
Proprietary Rights. " 

  Many of the Company's competitors are continuing to actively pursue patent 
protection for activities and discoveries similar to the Company's. There can 
be no assurance that these competitors, many of which have substantially 
greater resources than the Company and have made substantial investments in 
competing technologies, will not in the future seek to assert that the 
Company's products or chemical processes infringe their existing patents 
and/or will not seek new patents that claim to cover aspects of the Company's 
technology. Furthermore, patent applications in the United States are 
maintained in secrecy until patents issue, and patent applications in foreign 
countries are maintained in secrecy for a specified period after filing. 
Publication of discoveries in the scientific or patent literature tends to 
lag behind actual discoveries and the filing of related patent applications. 
In addition, patents issued and patent applications filed relating to 
biopharmaceuticals are numerous. Therefore, there can be no assurance that 
the Company is aware of all competitive patents, either pending or issued, 
that relate to products or processes used or proposed to be used by the 
Company. 

  The Company and MGH have entered into a license agreement pursuant to which 
MGH has granted the Company an exclusive worldwide license to the patents and 
patent applications which relate to the Company's only product candidate, 
MS-325. The MGH License imposed certain due diligence obligations with 
respect to the development of products covered by the license, all of which 
have been fulfilled to date. The MGH License requires the Company to pay 
royalties on net sales of MS-325 by the Company. The Company must also pay 
MGH a percentage of all royalties received by the Company from its 
sublicensees. Accordingly, the Company will be required to make payments to 
MGH on profits generated under the Mallinckrodt collaboration, if any, and on 
royalties received from Daiichi under its license agreement, if any. Failure 
of the Company to comply with these requirements could result in the 
conversion of the license from being exclusive to non-exclusive in nature or 
termination of the license agreement itself. Any such event would have a 
material adverse effect on the Company's business, financial condition and 
results of operations. 

  The pharmaceutical and biotechnology industries have been characterized by 
extensive litigation regarding patents and other intellectual property 
rights. Litigation may be necessary to enforce any patents issued to the 
Company and or determine the scope and validity of others' proprietary 
rights. The Company may have to participate in interference proceedings 
declared by the United States Patent and Trademark Office or by foreign 

                                      34 
<PAGE> 

agencies to determine the priority of inventions. Any involvement in 
litigation surrounding these issues could require extensive costs to the 
Company as well as be a significant distraction for management. Such costs 
could have a material adverse effect on the Company's business, financial 
condition and results of operations. 

  The Company also relies upon trade secrets, technical know-how, and 
continuing technological innovation to develop and maintain its competitive 
position. The Company typically requires its employees, consultants, and 
advisors to execute confidentiality and assignment of inventions agreements 
in connection with their employment, consulting or advisory relationships 
with the Company. These agreements require disclosure and assignment to the 
Company of ideas, developments, discoveries and inventions made by employees, 
consultants and advisors. There can be no assurance, however, that these 
agreements will not be breached or that the Company will have adequate 
remedies for any breach. Furthermore, no assurance can be given that 
competitors will not independently develop substantially equivalent 
proprietary information and techniques or otherwise gain access to the 
Company's proprietary technology, or that the Company can meaningfully 
protect its rights in unpatented proprietary technology. 

  The Company intends to vigorously protect and defend its intellectual 
property. Costly and time-consuming litigation brought by the Company may be 
necessary to enforce patents issued to the Company, to protect trade secrets 
or know-how owned by the Company, or to determine the enforceability, scope, 
and validity of the proprietary rights of others. See "Risk 
Factors--Uncertainty Regarding Patents and Proprietary Rights." 

Manufacturing 

   
  The Company currently manufactures, as part of its ongoing development 
efforts, small non-GMP batches of MS-325 in its laboratories located in 
Cambridge, Massachusetts. The Company has contracted for the manufacture in 
accordance with GMP of MS-325 from outside contractors for use in preclinical 
and Phase I and II clinical trials. As part of its strategic alliance with 
the Company, Mallinckrodt will serve as primary manufacturer for MS-325 
thereafter. If Mallinckrodt is unable to produce MS-325 in adequate amounts 
and at a reasonable cost or to comply with any applicable regulations, 
including GMP, it could have a material adverse effect on the Company's 
business, financial condition and results of operations. Furthermore, should 
Mallinckrodt fail to fulfill its manufacturing responsibilities 
satisfactorily, the Company could be forced to find an alternative 
manufacturer. There can be no assurance that the Company would be able to 
find such an alternative manufacturer. In the event the Company was forced to 
develop its own FDA-approved full-scale manufacturing capability, it would 
require significant expenditures of capital and management attention and 
resources and could require the Company to obtain a license from a third 
party, and would result in a delay in the approval or commercialization of 
MS-325. There can be no assurance that the Company would be able to obtain 
such a license on commercially reasonable terms, if at all. The Company 
currently procures the raw materials for the various components of MS-325 
from a broad variety of vendors and, wherever possible, maintains 
relationships with multiple vendors for each component. There are a number of 
components of MS- 325 for which the largest suppliers may have significant 
control over the market price due to controlling market shares. If any one of 
the Company's suppliers decided to increase prices significantly or reduce 
quantities of any component of MS-325 available for sale to the Company, it 
could have a material adverse effect on the Company's ability to 
commercialize MS-325 and on the Company's business, financial condition and 
results of operations. See "Business--Strategic Alliances," "Risk 
Factors--Uncertainty Regarding Patents and Proprietary Rights," "--Limited 
Manufacturing Capability" and "--Dependence on Suppliers." 
    

Government Regulation 

  The manufacture and commercial distribution of the Company's product 
candidates are subject to extensive governmental regulation in the United 
States and other countries. Pharmaceuticals, including contrast imaging 
agents for use with MRI, are regulated in the United States by the FDA under 
the Food, Drug and Cosmetic Act ("FD&C Act") and require FDA approval prior 
to commercial distribution. Pursuant to the FD&C Act, pharmaceutical 
manufacturers and distributors must be registered with the FDA and are 
subject to ongoing FDA regulation, including periodic FDA inspection of their 
facilities and review of their operating procedures. Noncompliance with 
applicable requirements can result in failure to receive approval, withdrawal 
of approval, total or partial suspension of production, fines, injunctions, 
civil penalties, recalls or seizure of products and criminal prosecution, 
each of which would have a material adverse effect on the Company's business, 
financial conditions and results of operations. 

                                      35 
<PAGE> 

  In order to undertake clinical trials and market pharmaceutical products for 
diagnostic or therapeutic use in humans, the procedures and safety standards 
established by the FDA and comparable agencies in foreign countries must be 
followed. In the United States, a company seeking approval to market a new 
pharmaceutical must obtain FDA approval of a new drug application ("NDA"). 
Before an NDA may be filed, however, a certain procedure is typically 
followed. This includes: (i) performance of preclinical laboratory and animal 
studies; (ii) submission to the FDA of an application for an IND, which must 
become effective before human clinical trials may commence; (iii) completion 
of adequate and well-controlled human clinical trials to establish the safety 
and efficacy of the pharmaceutical for its intended application; (iv) 
submission to the FDA of an NDA; and (v) approval of the NDA by the FDA prior 
to any commercial sale or shipment of the agent. 

  Preclinical studies include laboratory evaluation of product chemistry and 
animal studies to assess the potential safety and efficacy of the product and 
its formulation. The results of the preclinical studies are submitted to the 
FDA as part of an IND, and unless the FDA objects, the IND will become 
effective 30 days following its receipt by the FDA. Clinical trials are 
conducted in accordance with protocols that detail the objectives of the 
study, the parameters to be used to monitor safety and the efficacy criteria 
to be evaluated. Each protocol together with information about the clinical 
investigators who will perform the studies and the institutions at which the 
trials will be performed are submitted to the FDA as part of the IND. An 
independent institutional review board ("IRB") at each institution at which 
the trial will be conducted will also be asked by the principal investigator 
at that institution to approve, according to FDA regulations governing IRBs, 
the trials that will be performed at that institution. The IRB will consider, 
among other things, ethical factors, the protection of human subjects and the 
possible liability of the institution. 

  Clinical trials under the IND are typically conducted in three sequential 
phases, but the phases may overlap. In Phase I, the initial introduction of 
the pharmaceutical into humans, the pharmaceutical is tested for safety, 
dosage tolerance, metabolism, distribution, excretion and clinical 
pharmacology in healthy adult subjects. Imaging agents may also be subject to 
a Phase IB trial under which an agent's imaging characteristics in humans are 
first evaluated. Phase II involves a detailed evaluation of the safety and 
efficacy of the agent in a range of doses in patients with the disease or 
condition being studied. Phase III clinical trials typically consist of 
evaluation of safety and efficacy in a larger patient population and at more 
institutions. 

  The Company submitted an IND for MS-325 to the FDA on July 22, 1996 and 
commenced Phase I clinical trials on September 6, 1996. The clinical safety 
monitoring portion of the trial ended on November 22, 1996. Upon the 
successful completion of the Phase I clinical trials, the Company intends to 
conduct concurrent but separate Phase II and Phase III clinical trials for 
different cardiology and radiology indications. The process of completing 
clinical testing and obtaining FDA approval for a new product is likely to 
take a number of years. When the study as described in the IND is complete, 
and assuming that the results support the safety and efficacy of the product 
for that indication, the Company intends to submit an NDA to the FDA. The NDA 
approval process can be expensive, uncertain and lengthy. Although the FDA is 
supposed to complete its review of an NDA within 180 days of the date that it 
is filed, the review time is often significantly extended by the FDA which 
may require more information or clarification of information already provided 
in the NDA. During the review period, an FDA advisory committee likely will 
be asked to review and evaluate the application and provide recommendations 
to the FDA about approval of the pharmaceutical. In addition, the FDA will 
inspect the facility at which the pharmaceutical is manufactured to ensure 
compliance with GMP and other applicable regulations. Failure of the 
third-party manufacturers to comply or come into compliance with GMP 
requirements could significantly delay FDA approval of the NDA. The FDA may 
grant an unconditional approval of an agent for a particular indication or 
may grant approval conditioned on further post-marketing testing and/or 
surveillance programs to monitor the agent's efficacy and side effects. 
Results of these post-marketing programs may prevent or limit the further 
marketing of the agent. In addition, additional studies and a supplement to 
the initially approved NDA will be required to gain approval for the use of 
an approved product in indications other than those for which the NDA was 
approved initially. 

  While the Company, because of its agreement with Mallinckrodt, does not 
currently intend to manufacture any of its products itself once they are 
approved, it may choose to do so in the future. Should the Company decide to 
manufacture its products, the Company would be required to obtain a license 
from a third party having rights to patents which may cover certain of the 
Company's contrast agents. There can be no assurance that the Company would 
be able to obtain such a license from the third party. Furthermore, the 
Company's 

                                      36 
<PAGE> 

manufacturing facilities would be subject to inspection and approval by the 
FDA before the Company could begin commercial distribution of product from 
its own manufacturing facilities. See "Business--Patents and Proprietary 
Rights" and "Risk Factors--Uncertainty Regarding Patents and Proprietary 
Rights." 

  After an NDA is approved, the Company would continue to be subject to 
pervasive and continuing regulation by the FDA, including record keeping 
requirements, reporting of adverse experience from the use of the agent and 
other requirements imposed by the FDA. FDA regulations also require FDA 
approval of an NDA supplement for certain changes if they affect the safety 
and efficacy of the pharmaceutical, including, but not limited to, new 
indications for use, labeling changes, the use of a different facility to 
manufacture, process or package the product, changes in manufacturing methods 
or quality control systems and changes in specifications for the product. 
Failure by the Company to receive approval of an NDA supplement could have a 
material adverse effect on the Company's business, financial condition and 
results of operations. 

  The advertising of most FDA-regulated products is subject to FDA and Federal 
Trade Commission jurisdiction, but the FDA has sole jurisdiction over 
advertisements for prescription drugs. The Company is and may be subject to 
regulation under state and Federal law regarding occupational safety, 
laboratory practices, handling of chemicals, environmental protection and 
hazardous substance control. The Company also will be subject to other 
present and possible future local, state, federal and foreign regulation. 
Failure to comply with regulatory requirements could have a material adverse 
effect on the Company's business, financial conditions and results of 
operations. 

  Approval and marketing of pharmaceutical products outside of the United 
States are subject to regulatory requirements that vary widely from country 
to country. In the European Union ("EU"), the general trend has been towards 
coordination of common standards for clinical testing of new agents, leading 
to changes in various requirements imposed by each EU country. The level of 
regulation in the EU and other foreign jurisdictions varies widely. The time 
required to obtain regulatory approval from comparable regulatory agencies in 
each foreign country may be longer or shorter than that required for FDA 
approval. In addition, in certain foreign markets the Company may be subject 
to governmentally mandated prices for its products. 

  Regulations regarding the approval, manufacture and sale of the Company's 
product candidates are subject to change. The Company cannot predict what 
impact, if any, such changes might have on its business, financial condition 
or results of operations. 

  The Company's research, development and manufacturing processes require the 
use of hazardous substances and testing on certain laboratory animals. As a 
result, the Company is also subject to federal, state, and local laws, 
regulations and policies governing the use, generation, manufacture, storage, 
air emission, effluent discharge, handling and disposal of certain materials 
and waste as well as the use of and care of laboratory animals. These laws 
and regulations are all subject to change. The Company cannot predict what 
impact, if any, such changes might have on its business, financial condition 
or results of operations. 

Reimbursement 

  The Company expects that sales volumes and prices of its products will be 
dependent in large measure on the availability of reimbursement from 
third-party payors and that individuals seldom would be willing or able to 
pay directly for all the costs associated with procedures which in the future 
may incorporate the use of the Company's products. The Company expects that 
its products will be purchased by hospitals, clinics, doctors and other users 
that bill various third-party payors, such as Medicare, Medicaid and other 
government insurance programs, and private payors including indemnity 
insurers, Blue Cross Blue Shield plans and managed care organizations 
("MCOs") such as health maintenance organizations. Most of these third-party 
payors provide coverage for MRI for some indications when it is medically 
necessary, but the amount that a third-party payor will pay for MRI may not 
include a separate payment for a contrast imaging agent that is used with 
MRI. Reimbursement rates vary depending on the procedure performed, the 
third-party payor, the type of insurance plan and other factors. For example, 
Medicare pays hospitals a prospectively determined amount for an in-patient 
stay based on a Medicare beneficiary's discharge diagnosis related group 
("DRG"). This payment includes payment for any procedure, including MRI, that 
is performed while a beneficiary is in the hospital. No additional payment is 
made for contrast agents used during the procedure. Other third-party payors 
may pay a hospital an additional amount for an MRI procedure performed on an 
in-patient according to another methodology such 

                                      37 
<PAGE> 

as a fee schedule or a percentage of charge. Such payment may or may not 
include a payment for a contrast imaging agent. In the outpatient setting, 
Medicare and other third-party payors may pay for all, some portion of, or 
none of the cost of contrast agents used with MRI. 

  Third-party payors carefully review and increasingly challenge the prices 
charged for procedures and medical products. In the past few years, the 
amounts paid for radiology procedures in particular have come under careful 
scrutiny and have been subject to decreasing reimbursement rates. In 
addition, an increasing percentage of insured individuals are receiving their 
medical care through MCOs which monitor and often require preapproval of the 
services that a member will receive. Many MCOs are paying their providers on 
a capitated basis which puts the providers at financial risk for the services 
provided to their patients by paying them a predetermined payment per member 
per month. The percentage of individuals covered by MCOs is expected to grow 
in the United States over the next decade. Even Medicare is shifting many of 
its beneficiaries into managed care plans. The Company believes that the 
managed care approach to healthcare and the growth in capitated arrangements 
and other arrangements under which the providers are at financial risk for 
the services that are provided to their patients will facilitate the market 
acceptance of its products, as it believes that the use of its products will 
significantly lower the overall costs and improve the effectiveness of 
managing patient populations. There can be no assurance, however, that the 
Company's products will be available, will lower costs of care for any 
patients or that providers will choose to utilize them even if they do, or if 
reimbursement will be available. 

  In foreign markets, reimbursement is obtained from a variety of sources, 
including governmental authorities, private health insurance plans and labor 
unions. In most foreign countries, there are also private insurance systems 
that may offer payments for alternative therapies. Although not as prevalent 
as in the United States, health maintenance organizations are emerging in 
certain European countries. The Company may need to seek international 
reimbursement approvals, although there can be no assurance that any such 
approvals will be obtained in a timely manner or at all. Failure to receive 
international reimbursement approvals could have a material adverse effect on 
market acceptance of the Company's product candidates in the international 
markets in which such approvals are sought. 

  The Company believes that reimbursement in the future will be subject to 
increased restrictions such as those described above, both in the United 
States and in foreign markets. The Company believes that the overall 
escalating cost of medical products and services has led to, and will 
continue to lead to, increased pressures on the health care industry, both 
foreign and domestic, to reduce the cost of products and services, including 
products offered by the Company. There can be no assurance, in either the 
United States or foreign markets, that third party reimbursement and coverage 
will be available or adequate, that current reimbursement amounts will not be 
decreased in the future or that future legislation, regulation, or 
reimbursement policies of third-party payors will not otherwise adversely 
affect the demand for the Company's product candidates or its ability to sell 
its product candidates on a profitable basis, particularly if MRI exams 
enhanced with the Company's contrast agents are more expensive than competing 
vascular imaging techniques that are equally effective. The unavailability or 
inadequacy of third-party payor coverage or reimbursement could have a 
material adverse effect on the Company's business, financial condition and 
results of operations. 

Product Liability Insurance 

  The clinical and commercial development of pharmaceuticals, including 
contrast imaging agents such as those being developed by the Company, may 
entail exposure to product liability claims. While the Company has never been 
subject to any liability claims stemming from the manufacture of or 
preclinical or clinical trials of its products, there can be no assurance 
that it will not face such claims in the future. While the Company currently 
has product liability insurance coverage for the clinical research use of its 
product candidates, there can be no assurance that such coverage limits will 
be adequate nor that a successful product liability lawsuit would not have a 
material adverse effect on the Company. The Company does not have product 
liability insurance coverage for the commercial sale of its products but 
intends to obtain such coverage if and when its products are commercialized. 
If and when MS-325 or other EPIX product candidates are approved for 
marketing by the FDA, or similar foreign regulatory bodies, there can be no 
assurance that sufficient product liability insurance will be available on 
terms acceptable to the Company or at all. 

                                      38 
<PAGE> 

Facilities 

  The Company leases a total of 17,050 square feet of space at 71 Rogers 
Street and adjacent locations, all in Cambridge, Massachusetts. The lease 
runs until December 31, 1997. The Company believes that its current 
facilities are adequate to meet its requirements for the foreseeable future. 

Employees 

  As of November 30, 1996 the Company employed 36 persons on a full-time 
basis, of which 26 were involved in research and development and 10 in 
administration and general management. Fifteen of the Company's employees 
hold Ph.D. or M.D. degrees. The Company believes that its relations are good 
with all of its employees. None of the Company's employees is a party to a 
collective bargaining agreement. See "Management--Executive Officers and 
Directors." 

Legal Proceedings 

  The Company is not a party to any material legal proceedings. 

                                      39 
<PAGE> 

                                  MANAGEMENT 

Executive Officers and Directors 

   
  The following table sets forth certain information regarding the executive 
officers, directors and key employees of the Company as of December 31, 1996: 
    


<TABLE>
<CAPTION>
 Name                                  Age  Position 
- -------------------------------------  ---------------------------------------------------------- 
<S>                                    <C>  <C>
Michael D. Webb                         38  President, Chief Executive Officer, Secretary and 
                                              Director 

James E. Smith, Ph.D.                   53  Executive Vice President, Research and Development 

Randall B. Lauffer, Ph.D.               39  Chief Scientific Officer and Director 

E. Kent Yucel, M.D.                     40  Senior Vice President and Chief Medical Officer 

Susan M. Flint                          45  Vice President, Regulatory Affairs 

Stephen C. Knight, M.D.                 36  Vice President, Strategic Planning and Corporate 
                                              Development 

Jeffrey R. Lentz                        43  Vice President, Finance and Administration, Chief 
                                              Financial Officer, Treasurer and Assistant 
                                              Secretary 

Christopher F. O. Gabrieli (1)(2)       36  Chairman of the Board 

Luke B. Evnin, Ph.D. (1)(2)             33  Director 

Stanley T. Crooke, M.D., Ph.D. (1)      51  Director and Chairman of the Scientific Advisory 
                                              Board 
</TABLE>

- ---------------------- 
(1) Member of the Compensation Committee. 

(2) Member of the Audit Committee. 

  Michael D. Webb joined EPIX in December 1994 from Ciba-Corning Diagnostics, 
Inc., where he was most recently Senior Vice President, Worldwide Marketing 
and Strategic Planning. During his tenure at Ciba from April 1989 to December 
1994, Mr. Webb's achievements included the development and commercialization 
of the ACS:180(r) immunodiagnostics system. From 1984 to 1989, Mr. Webb was a 
senior consultant at Booz, Allen & Hamilton, Inc., specializing in healthcare 
and life sciences. Mr. Webb holds an MM degree in marketing and finance from 
the J.L. Kellogg Graduate School of Management at Northwestern University. 

  Dr. James E. Smith has over 20 years experience in the in vivo diagnostics 
industry. Prior to joining EPIX in February 1996, Dr. Smith worked for 16 
years at Du Pont Merck Pharmaceutical Company, where his experience included 
research and development, regulatory, QA/QC and manufacturing for the radio- 
pharmaceutical division, most recently as Senior Director of 
Radiopharmaceutical Research and Development. Dr. Smith has published and 
lectured on radiopharmaceutical research and development. Dr. Smith received 
his Ph.D. degree in inorganic chemistry from the University of Washington. 

  Dr. Randall B. Lauffer, Chief Scientific Officer, founded the Company in 
November 1988 and served as Chief Executive Officer until December 1994 and 
as Chairman until October 1996. From November 1983 to March 1992, Dr. Lauffer 
was a member of the faculty of Harvard Medical School, serving most recently 
as Assistant Professor of Radiology from 1987 to 1992. During this time he 
was also Director of the NMR Contrast Media Laboratory at MGH as well as an 
NIH Postdoctoral Fellow and an NIH New Investigator. Dr. Lauffer is the 
primary inventor of the Company's core technology and is the originator of 
several types of MRI technology, including hepatobiliary (liver-enhancing) 
agents, vascular agents, tissue blood flow agents, and strategies to increase 
the magnetic efficiency of MRI agents in the body. He has written over 50 
scientific publications and two books, and has been named on several U.S. 
patents. Dr. Lauffer holds a Ph.D. degree in inorganic chemistry from Cornell 
University. 

                                      40 
<PAGE> 

  Dr. E. Kent Yucel joined the Company in June 1996. From March 1993 to July 
1996, he was Chief of Vascular and Interventional Radiology and Director of 
MRI at Boston Medical Center and Professor of Radiology at Boston University 
Medical School. From July 1988 to February 1993 he served as Assistant 
Professor of Radiology at MGH and Harvard Medical School. Dr. Yucel was 
Principal Investigator for a Phase III vascular imaging trial of Prohance(R), 
the nonspecific MRI agent now sold by Bracco. Dr. Yucel is the editor and 
co-author of Magnetic Resonance Angiography (McGraw-Hill, 1995). Dr. Yucel 
received his M.D. degree from Harvard Medical School. 

  Ms. Susan M. Flint joined the Company in April 1995. She is a Regulatory 
Affairs specialist with over twenty years of experience in regulatory 
submissions and clinical trials. She was a regulatory affairs/clinical 
research consultant to various companies, including EPIX, from April 1993 to 
April 1995. Ms. Flint previously held the position of Director of Clinical 
Trials at Advanced Magnetics, Inc. from February 1989 to March 1993 and 
Director of Regulatory Affairs at Du Pont Pharmaceutical Company from June 
1975 to January 1989. She has filed a number of applications for INDs and ten 
NDAs, along with several medical device applications. Ms. Flint is certified 
by the Regulatory Affairs Professional Society. She received her M.S. degree 
in pharmacology from Northeastern University. 

  Dr. Stephen C. Knight joined the Company in July 1996. From April 1991 to 
June 1996, Dr. Knight was a senior consultant with Arthur D. Little 
specializing in biotechnology, pharmaceuticals and valuation. Dr. Knight was 
also a consultant at APM, Inc., a consulting company. Prior to 1990, Dr. 
Knight performed research at AT&T Bell Laboratories, the National Institute 
of Neurological and Communicative Diseases and Stroke, and Yale University. 
He serves on the board of directors of Pharmos, Inc. Dr. Knight holds an M.D. 
from the Yale University School of Medicine and an MPPM degree from the Yale 
School of Organization and Management. 

  Jeffrey R. Lentz joined the Company in May 1996 as Vice President, Finance 
and Administration. He is also the Company's Chief Financial Officer and 
Treasurer. Prior to joining the Company, Mr. Lentz worked from August 1994 to 
May 1996 in private practice as a consultant and in venture capital. Mr. 
Lentz served as Director of Finance with Nova Biomedical Corporation from 
March 1993 to August 1994 and as a senior manager with Ernst & Young LLP from 
November 1986 to November 1992. Mr. Lentz is a certified public accountant 
and holds an M.S. degree from Northeastern University. 

  Christopher F. O. Gabrieli has served as a director of the Company since 
February 1994. He has been a General Partner at Bessemer Venture Partners in 
Wellesley Hills, Massachusetts since September 1986, where he is responsible 
for the firm's venture capital investment activities in healthcare and the 
life sciences. He currently serves on the boards of directors of Isis 
Pharmaceuticals, where he was a co-founder, Opta Food Ingredients and several 
privately held biomedical companies. Prior to joining Bessemer, Mr. Gabrieli 
was a founder, President and director of GMIS, Inc., a supplier of clinical 
information systems. Mr. Gabrieli is a graduate of Harvard College. 

  Dr. Luke B. Evnin has served as a director of the Company since February 
1994. He is a General Partner at Accel Partners, where he has been involved 
in the firm's biomedical investing activities since September 1990. He 
currently serves on the boards of directors of several private companies 
including Iotek, Sonix Technologies, and Signal Pharmaceuticals. Dr. Evnin 
received his Ph.D. degree from the Department of Biochemistry at the 
University of California at San Francisco. 

   
  Dr. Stanley T. Crooke has served as a director of the Company since January 
1996. Since 1987, he has been Chairman and Chief Executive Officer of Isis 
Pharmaceuticals in Carlsbad, California. Dr. Crooke serves on the boards of 
directors of GeneMedicine, SIBIA and the Biotechnology Industry Organization. 
Dr. Crooke holds an M.D. degree and a Ph.D. degree in pharmacology, both from 
Baylor College of Medicine, where Dr. Crooke has served as an adjunct 
professor of pharmacology. 
    

  The Company, the holders of the Company's Series A and Series B Convertible 
Preferred Stock and certain of the holders of the Company's Common Stock (the 
"Common Holders"), including Dr. Lauffer, are parties to an Amended and 
Restated Stockholders' Voting Agreement pursuant to which each such 
stockholder has agreed to elect (i) two directors designated by the Common 
Holders and the Series A stockholders, voting together as a class, (ii) two 
directors designated by the Series B stockholders, one to be designated by 
Accel IV L.P. and certain related persons and one to be designated by 
Bessemer Venture Partners III L.P. and (iii) two directors mutually agreeable 
to Dr. Lauffer and the holders of a majority of then outstanding shares of 
Series 

                                      41 
<PAGE> 

B Convertible Preferred Stock. Drs. Lauffer and Evnin and Mr. Gabrieli were 
elected pursuant to this agreement. This agreement will automatically 
terminate upon the consummation of this offering. 

  The Company's Restated Certificate, to be filed concurrently with the 
closing of this offering, provides for a classified board of directors 
consisting of three classes, with each class being as nearly equal in number 
as possible. The term of one class expires and their successors are elected 
for a term of three years at each annual meeting of the Company's 
stockholders. The Company has designated two class I directors (Drs. Evnin 
and Lauffer), one class II director (Dr. Crooke) and two class III directors 
(Messrs. Gabrieli and Webb). These class I, class II and class III directors 
will serve until the annual meeting of stockholders to be held in 1997, 1998 
and 1999, respectively, and until their respective successors are duly 
elected and qualified, or until their earlier resignation or removal. The 
Restated Certificate provides that directors may be removed only for cause by 
a majority of stockholders. See "Description of Capital Stock--Anti-Takeover 
Measures." There are no family relationships among any of the directors or 
executive officers. 

Board Committees 

  The Company has standing Audit and Compensation Committees of the Board of 
Directors. The Audit Committee consists of Dr. Evnin and Mr. Gabrieli. The 
primary function of the Audit Committee is to assist the Board of Directors 
in the discharge of its duties and responsibilities by providing the Board 
with an independent review of the financial health of the Company and of the 
reliability of the Company's financial controls and financial reporting 
systems. The Audit Committee reviews the general scope of the Company's 
annual audit, the fee charged by the Company's independent accountants and 
other matters relating to internal control systems. 

  The Compensation Committee of the Board of Directors determines the 
compensation to be paid to all executive officers of the Company, including 
the Chief Executive Officer. The Compensation Committee's duties include the 
administration of the Company's Amended and Restated 1992 Equity Incentive 
Plan (the "Equity Plan") and the 1996 Employee Stock Purchase Plan. The 
Compensation Committee is currently composed of Drs. Crooke and Evnin and Mr. 
Gabrieli. 

Scientific Advisory Board 

  The Company's Scientific Advisory Board consists of individuals with 
demonstrated expertise in various fields who advise the Company concerning 
long-term scientific planning, research and development. Members also 
evaluate the Company's research program, recommend personnel to the Company 
and advise the Company on technology matters. While the Scientific Advisory 
Board has not met collectively, its members have been available individually 
to advise the Company on specific scientific and technical issues. Scientific 
Advisory Board members are compensated on a time and expenses basis and some 
members have received nonstatutory stock options under the Equity Plan. The 
Company has entered into consulting agreements with a number of the 
Scientific Advisory Board members. 

  No member of the Scientific Advisory Board is employed by the Company, and 
members may have other commitments to or consulting or advisory contracts 
with their employers or other entities that may conflict or compete with 
their obligations to the Company. Accordingly, such persons are expected to 
devote only a small portion of their time to the Company. The current members 
of the Company's Scientific Advisory Board are: 

  Stanley T. Crooke, M.D., Ph.D., Chairman of the Scientific Advisory Board. 
See "Management--Executive Officers and Directors." 

  Lawrence H. Cohn, M.D., is Professor of Surgery at Harvard Medical School 
and Chief of Cardiac Surgery at the Brigham and Women's Hospital in Boston. 
He is a member of the Council on Cardiovascular Surgery at the American Heart 
Association and serves on the editorial boards of the Journal of the American 
College of Cardiology, American Heart Journal, the Journal of Cardiovascular 
Surgery, and the Harvard Heart Letter. Dr. Cohn is an author of over 300 
scientific papers in the area of cardiovascular surgery. 

  Richard S. J. Frackowiak, M.D., is Professor and Head of the Wellcome 
Department of Cognitive Neurology and Director of the Leopold Muller 
Functional Imaging Laboratory at the Institute of Neurology in London. He is 
also Consultant Neurologist at the National Hospital for Neurology and 
Neurosurgery. Dr. Frackowiak is Editor-in-Chief of NeuroImage: a Journal of 
Brain Function and Deputy Chief Editor of the Journal of 

                                      42 
<PAGE> 

Cerebral Blood Flow and Metabolism. He has published over 200 scientific 
papers in the area of function brain imaging. 

  Jean-Marie Lehn, Ph.D., is Professor of Chemistry at the Universite Louis 
Pasteur, Strasbourg, France. He has authored over 400 scientific papers in 
the areas of organic, bio-organic and inorganic chemistry. Dr. Lehn shared 
the 1987 Nobel Prize in Chemistry for the design of the first cryptand, a 
cage-like complexing agent for metal ions. 

  Kenneth N. Raymond, Ph.D., is Professor of Chemistry at the University of 
California, Berkeley. He is Chair of the Inorganic Division of the American 
Chemical Society and serves on the editorial boards of Advances in Inorganic 
Chemistry, the Journal of Biological Inorganic Chemistry, the Journal of 
Coordination Chemistry, and BioMetals. Dr. Raymond has published over 260 
scientific papers on the structural, biological and medical aspects of metals 
such as iron and gadolinium. 

  Bruce R. Rosen, M.D., Ph.D., is an Associate Professor of Radiology at 
Harvard Medical School and Co- Director of the Massachusetts General Hospital 
NMR Center. He is also Director of the Radiological Sciences Joint Program at 
the Harvard/Massachusetts Institute of Technology Division of Health Sciences 
and Technology. Dr. Rosen serves on the Board of Trustees of the 
International Society of Magnetic Resonance in Medicine and is on the 
editorial boards of Magnetic Resonance Imaging and the Journal of Computer 
Assisted Tomography. He is also Associate Editor of Human Brain Mapping. Dr. 
Rosen has published over 100 scientific papers in MRI, including the first 
studies of real-time cognitive activity in the human brain. 

  Burton E. Sobel, M.D., is the E. L. Amidon Professor and Chairman of the 
Department of Medicine and Professor of Biochemistry at the University of 
Vermont. He is also Physician-in-Chief at Fletcher Allen Health Care in 
Burlington, VT. Dr. Sobel is a Fellow of the American College of Cardiology 
and the Royal Society of Medicine and has various editorial positions with 
Circulation, American Journal of Cardiology, Coronary Artery Disease, and 
Fibrinolysis. He has published extensively in the area of coronary artery 
disease. 

  Christopher T. Walsh, Ph.D., is the Hamilton Kuhn Professor and Chairman of 
the Department of Biological Chemistry and Molecular Pharmacology at Harvard 
Medical School. He is a member of the National Academy of Sciences, the 
Institute of Medicine, and the National Institutes of Health General Medical 
Sciences Council. Dr. Walsh serves on the Scientific Advisory Boards of KOSAN 
Biosciences and IDUN Pharmaceuticals, and he is a director of LeukoSite. He 
has over 400 publications in the areas of enzymatic reactions and the 
mechanisms of drug action. 

Director Compensation 

  Directors currently receive no compensation for their service on the 
Company's Board of Directors except pursuant to the 1996 Director Stock 
Option Plan (the "Director Plan") described below. 

  1996 Director Stock Option Plan. In December 1996, the Board of Directors 
and stockholders of the Company adopted the Director Plan. All of the 
directors who are not employees of the Company (the "Eligible Directors") are 
currently eligible to participate in the Director Plan. There are 66,666 
shares of Common Stock reserved for issuance under the Director Plan. Upon 
the election or reelection of an Eligible Director, such director is 
automatically granted an option to purchase 6,666 shares of Common Stock (the 
"Option"). Each Option becomes exercisable with respect to 1,333 shares on 
each anniversary date of grant for a period of five years, provided that the 
optionee is still a director of the Company at the opening of business on 
such date. The Options have a term of ten years. The exercise price for the 
Options is equal to the last sale price for the Common Stock on the business 
day immediately preceding the date of grant, as reported on the Nasdaq 
National Market. The exercise price may be paid in cash or shares of Common 
Stock, or a combination of both. 

Executive Compensation 

   
  The following table sets forth certain compensation information for the 
Chief Executive Officer of the Company and the one other executive officer of 
the Company whose salary and bonus for the year ended December 31, 1996 
exceeded $100,000 (together, the "Named Executive Officers"): 
    

                                      43 
<PAGE> 

   
                           Summary Compensation Table
<TABLE>
<CAPTION>
                                                                              Long-Term 
                                                 Annual Compensation     Compensation Awards 
                                              ------------------------- --------------------- 
                                                                        Securities Underlying 
Name and Principal Position            Year       Salary       Bonus         Options (#)       All Other Compensation 
- -------------------------------------  ------ --------------  --------- --------------------- ------------------------ 
<S>                                    <C>      <C>           <C>              <C>                     <C>
Michael D. Webb,                       1996      $175,000          --           83,333                      -- 
 President and Chief Executive         1995      $175,000          --               --                 $30,000(1) 
  Officer 

Randall B. Lauffer, Ph.D.,             1996      $160,000          --               --                 $ 1,100(2) 
 Chief Scientific Officer              1995      $158,367          --               --                 $ 1,100(2) 

James E. Smith, Ph.D.,                 1996      $200,615(4)       --          106,666                      -- 
 Executive Vice President,             1995      $ 82,238(5)       --               --                      -- 
 Research and Development (3) 

Susan M. Flint (6),                    1996      $112,300          --           16,666                      -- 
 Vice President, Regulatory Affairs    1995      $ 26,282(7)       --           46,666                      -- 

Stephen C. Knight, M.D.,               1996      $ 80,000     $30,000          133,333                      -- 
 Vice President, Strategic Planning 
  and Corporate Development (8) 

</TABLE>
    

   
- ---------------------- 
(1) Consists of payment made upon commencement of employment with the 
    Company. 
    

(2) Consists of life insurance premiums paid by the Company on behalf of Dr. 
    Lauffer on a policy for the benefit of Dr. Lauffer. 

   
(3) Dr. Smith became an employee of the Company in February 1996. Prior 
    thereto, he was engaged as a consultant to the Company. 
    

   
(4) Includes $37,200 compensation earned for consulting services. 
    

   
(5) Includes $82,238 compensation earned for consulting services. 
    

   
(6) Ms. Flint became an employee of the Company in April 1995. Prior thereto,
    she was engaged as a consultant to the Company.
    

   
(7) Consists of $26,282 compensation earned for consulting services. 
    

   
(8) Dr. Knight became an employee of the Company in July 1996. 
    

   
  The following table sets forth certain information regarding options granted 
during the fiscal year ended December 31, 1996 by the Company to the Named 
Executive Officers. 
    

                      Option Grants In Last Fiscal Year 

   
<TABLE>
<CAPTION>
                                                                                       Potential Realizable     
                                               Individual Grant                                Value            
                           --------------------------------------------------------   at Assumed Annual Rates   
                             Number of      Percent of                                    of Stock Price        
                             Securities   Total Options                                    Appreciation         
                             Underlying     Granted to    Exercise or                  for Option Terms (1)     
                              Options      Employees in    Base Price   Expiration   -------------------------  
Name                        Granted (#)    Fiscal Year     ($/share)       Date          5%           10% 
- -------------------------- ------------- --------------- ------------- ------------ ------------  ------------ 
<S>                        <C>           <C>             <C>           <C>          <C>           <C>
Michael D. Webb                83,333(2)       11.1%        $ 5.250        8/7/06     $275,140      $697,260 

Randall B. Lauffer, Ph.D.           0          --            --                --           --            -- 

James E. Smith, Ph.D.         100,000(3)       13.3%        $ 0.825        2/1/06     $ 51,884      $131,484 
                               33,333(4)        4.4%        $ 5.250        8/7/06     $110,055      $278,902 

Susan M. Flint                 16,666(5)        2.2%        $ 5.250        8/7/06     $ 55,026      $139,447 

Stephen C. Knight, M.D.       133,333(6)       17.7%        $ 4.500       6/17/06     $377,336      $956,243 
</TABLE>
    
                                      44 
<PAGE> 

   
- ---------------------- 
(1) The dollar amounts under these columns are the result of calculations at 
    the 5% and 10% rates set by the Securities and Exchange Commission and, 
    therefore, are not intended to forecast possible future appreciation, if 
    any, in the price of the underlying Common Stock. No gain to the 
    optionees is possible without an increase in price of the underlying 
    Common Stock, which will benefit all stockholders proportionately. 
    

(2) The option becomes exercisable as to 16.8% of the shares covered by such 
    option: 

   
(bullet) upon the earlier of (i) commencement of Phase III clinical trials 
         for MS-325 or a clinically equivalent vascular agent as determined by 
         the Company's Board of Directors or (ii) August 7, 2005; 
    

   
(bullet) upon the earlier of (i) the first anniversary of the date of 
         commencement of Phase III clinical trials for MS-325 or a clinically 
         equivalent vascular agent as determined by the Company's Board of 
         Directors or (ii) August 7, 2005; 
    

   
(bullet) upon the earlier of (i) the second anniversary of the date of 
         commencement of Phase III clinical trials for MS-325 or a clinically 
         equivalent vascular agent as determined by the Company's Board of 
         Directors or (ii) August 7, 2005;
    

   
(bullet) upon the earlier of (i) the first anniversary of the date of receipt 
         of NDA approval for MS-325 or a clinically equivalent vascular agent 
         as determined by the Company's Board of Directors or (ii) August 7, 
         2005; and 
    

   
(bullet) upon the earlier of (i) the second anniversary of the date of 
         receipt of NDA approval for MS-325 or a clinically equivalent 
         vascular agent as determined by the Company's Board of Directors or 
         (ii) August 7, 2005. 
    

   
    The option also becomes exercisable as to 16% of the shares covered by such 
    option upon the earlier of (i) the date of receipt of NDA approval for 
    MS-325 or a clinically equivalent vascular agent as determined by the 
    Company's Board of Directors or (ii) August 7, 2005. 
    

   
(3) The option became exercisable as to 16% of the shares covered by such 
    option on February 23, 1996. The option also became exercisable as to 20% 
    of the shares on August 21, 1996 (30 days after the FDA's receipt of the 
    Company's MS-325 IND filing for MS-325). The option becomes exercisable as 
    to 16% of the shares covered by such option February 23 of each of 1997, 
    1998, 1999 and 2000. 
    

   
(4) The option becomes exercisable as to 50% of the shares covered by such 
    option upon the earlier of (i) commencement of Phase III clinical trials 
    for MS-325 or a clinically equivalent vascular agent as determined by the 
    Company's Board of Directors or (ii) August 7, 2004. The option also becomes
    exercisable as to 50% of the shares covered upon the earlier of (i) receipt
    of NDA approval for MS-325 or a clinically equivalent vascular agent as 
    determined by the Company's Board of Directors or (ii) August 7, 2004. 
    

   
(5)  The option becomes exercisable as to 50% of the shares covered by such
     option upon the earlier of (i) commencement of Phase III clinical trials
     for MS-325 or a clinically equivalent vascular agent as determined by the
     Company's Board of Directors or (ii) August 7, 2004. The option also
     becomes exercisable as to 50% of the shares covered by such option upon the
     earlier of (i) receipt of NDA approval for MS-325 or a clinically
     equivalent vascular agent as determined by the Board of Directors or (ii)
     August 7, 2004.
    

   
(6) The option became exercisable as to 12.5% of the shares covered by such 
    option on July 17, 1996. The option becomes exercisable as to 12.5% of 
    the shares covered by such option on July 17 of each of 1997, 1998, 1999, 
    2000 and 2001. The option also becomes exercisable as to 25% of the shares 
    covered by such option on the earlier of (i) completion of a major 
    corporate milestone which he has personally led for the Company as 
    determined by the Company's Chief Executive Officer and on approval by 
    the Company's Board of Directors or (ii) June 17, 2005. 
    


                                      45 
<PAGE> 

   
The following table sets forth certain information concerning exercisable and 
unexercisable stock options held by the Named Executive Officers as of 
December 31, 1996: 

             Aggregated Option Exercises In Last Fiscal Year And 
                        Fiscal Year-End Option Values 
    


   
<TABLE>
<CAPTION>
                                                      Number of Securities                                        
                                                           Underlying                                             
                                                           Unexercised                 Value of Unexercised       
                           Shares                          Options at                  In-The-Money Options       
                          Acquired                       Fiscal Year-End              at Fiscal Year-End(1)       
                             in        Value     -------------------------------  ------------------------------- 
Name                      Exercise  Realized(1)  Exercisable       Unexercisable   Exercisable    Unexercisable 
- ----------------------- ----------- ------------ -------------- ---------------- --------------  ---------------- 
<S>                        <C>        <C>           <C>             <C>             <C>            <C>
Michael D. Webb            33,333     $268,197      105,179         241,955         $846,270       $1,547,105 
Randall B. Lauffer, 
  Ph.D. (2)                    --           --           --              --               --               -- 
James E. Smith, Ph.D.          --           --       42,666          97,000          327,462          598,450 
Susan M. Flint                 --           --       14,667          48,665          118,012          311,632 
Stephen C. Knight, M.D.        --           --       16,666         116,667           66,664          466,668 
</TABLE>
    

   
- ---------------------- 
(1) Based on the difference between the fair market value of the underlying 
    shares of Common Stock on December 31, 1996 as determined by the Board of 
    Directors and the option exercise price. 
    

   
(2) Dr. Lauffer does not hold any stock options. 
    


                                      46 
<PAGE> 

Stock Plans 

  Amended and Restated 1992 Equity Incentive Plan. The Company's 1992 Equity 
Incentive Plan was adopted in July 1992 and amended and restated in December 
1996 (as amended and restated, the "Equity Plan"). The Equity Plan is 
designed to provide the Company flexibility in awarding equity incentives by 
providing for multiple types of incentives that may be awarded. The purpose 
of the Equity Plan is to attract and retain key employees of and consultants 
of the Company and to enable them to participate in the long-term growth of 
the Company. The Equity Plan provides for the grant of stock options 
(incentive and nonstatutory), stock appreciation rights, performance shares, 
restricted stock or stock units for the purchase of an aggregate of 1,599,901 
shares of Common Stock, subject to adjustment for stock-splits and similar 
capital changes. Awards under the Equity Plan can be granted to officers, 
employees and other individuals as determined by the committee of the Board 
of Directors which administers the Equity Plan, each of whose members is a 
"non- employee director" within the meaning of Rule 16b-3 under the 
Securities Act. The Compensation Committee of the Board of Directors 
administers the Equity Plan. The Compensation Committee selects the 
participants and establishes the terms and conditions of each option or other 
equity right granted under the Equity Plan, including the exercise price, the 
number of shares subject to options or other equity rights and the time at 
which such options become exercisable. The exercise price of all "incentive 
stock options" within the meaning of Section 422 of the Code, granted under 
the Equity Plan must be at least equal to 100% of the fair market value of 
the option shares on the date of grant. The term of any incentive stock 
option granted under the Equity Plan may not exceed ten years. 

  As of December 31, 1996, options to purchase an aggregate of 1,497,644 
shares of Common Stock had been granted under the Equity Plan. Options to 
purchase 172,574 shares were exercised as of such date and options to 
purchase 47,267 shares were cancelled. Of the options to purchase an 
aggregate of 1,277,803 shares of Common Stock that were outstanding as of 
such date, options to purchase 392,933 shares were exercisable. No stock 
appreciation rights or award other than option grants have been granted under 
the Equity Plan. 

  1996 Employee Stock Purchase Plan. In December 1996, the Company adopted the 
Company's 1996 Employee Stock Purchase Plan (the "Purchase Plan") under which 
employees may purchase shares of Common Stock at a discount from fair market 
value. There are 66,666 shares of Common Stock reserved for issuance under 
the Purchase Plan. To date, no shares of Common Stock have been issued under 
the Purchase Plan. The Purchase Plan is intended to qualify as an employee 
stock purchase plan within the meaning of Section 423 of the Code. Rights to 
purchase Common Stock under the Purchase Plan are granted at the discretion 
of the Compensation Committee, which determines the frequency and duration of 
individual offerings under the Purchase Plan and the dates when stock may be 
purchased. Eligible employees participate voluntarily and may withdraw from 
any offering at any time before stock is purchased. Participation terminates 
automatically upon termina- tion of employment. The purchase price per share 
of Common Stock in an offering is 85% of the lesser of its fair market value 
at the beginning of the offering period or on the applicable exercise date 
and may be paid through payroll deductions, periodic lump sum payments or a 
combination of both. The Purchase Plan terminates in December 2006. 

Compensation Committee Interlocks and Insider Participation 

   
  The Compensation Committee is responsible for determining salaries, 
incentives and other forms of compensation for directors, officers and other 
employees of the Company. The Compensation Committee also administers various 
incentive compensation and benefit plans. See "Management--Stock Plans." The 
Compensation Committee currently consists of Drs. Crooke and Evnin and Mr. 
Gabrieli. Dr. Evnin is a General Partner of Accel Partners, a venture capital 
firm and a principal stockholder of the Company. Mr. Gabrieli is a General 
Partner of Bessemer Venture Partners, a venture capital firm and a principal 
stockholder of the Company. See "Certain Transactions" and "Principal 
Stockholders." 
    


                                      47 
<PAGE> 

                             CERTAIN TRANSACTIONS 

  In May 1995, the Company issued convertible promissory notes to Accel IV 
L.P., Bessemer Venture Partners III L.P. and certain related persons in the 
aggregate principal amount of $1,500,000 bearing interest at a rate of 10% 
per annum and convertible into shares of Series C Convertible Preferred Stock 
at a conversion price of $4.54 per share (the "1995 Convertible Notes"). Dr. 
Luke B. Evnin, a director of the Company, is a General Partner of Accel IV 
Associates L.P., the General Partner of Accel IV L.P. See footnotes (2) and 
(10) to the table set forth under "Principal Stockholders." Christopher F.O. 
Gabrieli, Chairman of the Company, is a General Partner of Deer III & Co., 
the General Partner of Bessemer Venture Partners III L.P. See footnotes (3) 
and (9) to the table set forth under "Principal Stockholders." 

  In November and December 1995, Accel IV L.P., Bessemer Venture Partners III 
L.P. and certain related persons made bridge loans to the Company in an 
aggregate principal amount of $1,200,000 in exchange for promissory notes 
bearing interest at a rate of 10% per annum and convertible into shares of 
the Company's securities in the Company's next permanent equity financing 
(the "1995 Bridge Notes"). 

  In January 1996, the 1995 Convertible Notes were amended and restated (the 
"Amended 1995 Convertible Notes") to, among other things, change the 
conversion price to between $1.51 and $2.25 per share, depending on certain 
events of conversion. At such time, the Company also issued additional 
convertible promissory notes to the holders of the Amended 1995 Convertible 
Notes in an aggregate principal amount of $1,515,862 (the "1996 Convertible 
Notes") with the same terms as the Amended 1995 Convertible Notes in exchange 
for cash and the surrender of the 1995 Bridge Notes (including accrued 
interest thereon). 

  In February 1996, Accel IV L.P., Bessemer Venture Partners III L.P. and 
certain related persons made bridge loans to the Company in the aggregate 
principal amount of $600,000 in exchange for promissory notes bearing 
interest at a rate of 10% per annum (the "1996 Bridge Notes"). 

  In March 1996, the Company entered into a Development and License Agreement 
with Daiichi. Pursuant to such agreement, the Company granted Daiichi an 
exclusive license to develop and market MS-325 in Japan in exchange for an 
up-front fee of $3.0 million and future milestone payments for up to an 
aggregate of $3.3 million and royalty payments on net sales of MS-325 in 
Japan. In addition, pursuant to the agreement with Daiichi, in May and August 
1996, the Company sold an aggregate of 868,329 shares of Series E Convertible 
Preferred Stock to Daiichi (which will convert into an aggregate amount of 
578,886 shares of Common Stock upon the closing of this offering) at a price 
of $5.76 per share. 

  In May 1996, the Company sold 1,700,002 shares of Series D Convertible 
Preferred Stock (which will convert into 1,133,325 shares of Common Stock 
upon the closing of this offering) at a price of $3.00 per share (the "Series 
D Financing"). In connection with the Series D Financing, Accel IV L.P., 
Bessemer Venture Partners III L.P. and certain related persons surrendered 
their respective 1996 Bridge Notes as partial payment for their respective 
shares of Series D Preferred Stock and each received cash payments from the 
Company in the aggregate amount of $9,698 for accrued interest on their 
respective 1996 Bridge Notes. Through the Series D Financing, Accel IV L.P. 
and certain related persons purchased 266,668 shares (244,267 shares held by 
Accel IV L.P., 9,867 shares held by Accel Investors '93 L.P., 5,067 shares 
held by Accel Keiretsu L.P., 5,867 shares held by Ellmore C. Patterson 
Partners and 1,600 shares held by Prosper Partners), Bessemer Venture 
Partners III L.P. and certain related persons purchased 266,667 shares 
(213,696 shares held by Bessemer Venture Partners III L.P. and 40,983 shares 
held by certain related persons, including 9,990 shares held directly by Mr. 
Gabrieli and 1,998 shares held by the Gabrieli Family Foundation, of which 
Mr. Gabrieli is President), affiliates of Advent International Corporation 
purchased 666,667 shares (365,000 shares held by Rovent II Limited 
Partnership, 200,000 shares held by Advent Performance Materials Limited 
Partnership, 66,667 shares held by Adwest Limited Partnership and 35,000 
shares held by Advent Partners Limited Partnership) and Fidelity Ventures 
Ltd. purchased 500,000 shares. 

  Concurrently with the Series D Financing, Accel IV L.P., Bessemer Ventures 
Partners III L.P. and certain related persons converted the entire principal 
amount of their respective Amended 1995 Convertible Notes and 1996 
Convertible Notes, plus accrued interest, into 1,432,318 shares of Series C 
Convertible Preferred Stock (which will convert into 954,872 shares of Common 
Stock upon the closing of this offering) as follows: 656,006 shares held by 
Accel IV L.P.; 26,498 shares held by Accel Investors '93 L.P.; 13,607 shares 
held by Accel Keiretsu L.P.; 15,755 shares held by Ellmore C. Patterson 
Partners; 4,296 shares held by Prosper Partners); 642,837 shares 

                                      48 
<PAGE> 

held by Bessemer Venture Partners III L.P.; and 43,386 shares held by certain 
persons related to Bessemer Venture Partners III L.P., including 25,328 
shares held directly by Mr. Gabrieli and 4,605 shares held by the Gabrieli 
Family Foundation. 

  In May 1996, the Company repurchased from Randall B. Lauffer, Ph.D., a 
director and executive officer of the Company, 66,666 shares of Common Stock 
at a price per share of $4.05. 

  In June 1995 and April 1996, the Company made two loans to Dr. Lauffer, each 
in the principal amount of $50,000 and bearing interest at the rate of 7.31% 
and 6.51% per annum, respectively (the Applicable Federal Rates for long term 
loans announced for such months), and each secured by a pledge of 14,814 
shares of the Company's Common Stock held by Dr. Lauffer. As of November 30, 
1996, the outstanding amounts on these loans were $55,352.82 and $52,140.27, 
respectively. In May 1996, the Company made a loan to Dr. Lauffer in the 
principal amount of $180,000 bearing interest at the rate of 6.83% per annum 
(the Applicable Federal Rate for long term loans announced for May 1996) and 
secured by a pledge of 44,444 shares of the Company's Common Stock held by 
Dr. Lauffer. As of November 30, 1996, the outstanding amount on this loan was 
$186,197.52. Each of these loans is subject to acceleration upon the 
voluntary termination of Dr. Lauffer's employment, among other events. 

                                      49 
<PAGE> 

                            PRINCIPAL STOCKHOLDERS 

   
  The following table and footnotes set forth certain information regarding 
the beneficial ownership of the Company's Common Stock as of December 31, 
1996 by (i) persons known by the Company to beneficially own 5% or more of 
the Company's Common Stock, (ii) the Named Executive Officers, (iii) each 
director of the Company and (iv) all current executive officers and directors 
as a group: 
    

   
<TABLE>
<CAPTION>
                                                                                    Percentage of Shares  
                                                                                   Beneficially Owned (1) 
                                                              Number of Shares    ----------------------- 
                                                             Beneficially Owned      Before      After 
Beneficial Owners                                                    (1)            Offering    Offering 
 ---------------------------------------------------------- --------------------- ----------- ----------- 
<S>                                                               <C>                 <C>         <C>
Accel IV L.P. and certain related persons (2)                     1,586,353           25.1%       19.1% 
 One Embarcadero Center 
  Suite 3820 
  San Francisco, CA 94111 

Bessemer Venture Partners III 
  L.P. and certain related persons (3)                            1,575,395           24.9        18.9 
 Bessemer Venture Partners 
  1025 Old Country Road 
  Suite 205 
  Westbury, NY 11590 

Daiichi Radioisotope Laboratories, Ltd. (4)                         578,885            9.2         7.0 
 17-10, Kyobashi 1-chome Chuo-ku 
  Tokyo, 104 Japan 

Affiliates of Advent International Corporation (5)                  455,009            7.2         5.5 
 101 Federal Street 
  Boston, MA 02110 

Fidelity Ventures Ltd. (6)                                          357,636            5.7         4.3
  82 Devonshire Street, R25C
  Boston, MA 02109

Michael D. Webb (7)                                                 171,845            2.7         2.0 

Randall B. Lauffer, Ph.D. (8)                                     1,266,664           20.1        15.2 

Christopher F.O. Gabrieli (9)                                     1,575,395           24.9        18.9 

Luke B. Evnin, Ph.D. (10)                                          1,586,353           25.1        19.1 

Stanley T. Crooke, M.D., Ph.D. (11)                                  11,041             *           * 

All current executive officers and directors as a group 
  (10 persons) (12)                                               4,678,626           72.5%       55.7% 
</TABLE>
    

- ---------------------- 
* Indicates less than 1%. 

   
 (1) Reflects the conversion, contemporaneously with the closing of this 
     offering, of all outstanding shares of preferred stock of the Company 
     into an aggregate of 4,750,288 shares of Common Stock. The number of 
     shares of Common Stock deemed outstanding after this offering includes 
     the 2,000,000 shares of Common Stock of the Company being offered for 
     sale in this offering. The persons and entities named in the table have 
     sole voting and investment power with respect to the shares beneficially 
     owned by them, except as noted below. Share numbers include shares of 
     Common Stock issuable pursuant to the outstanding options and warrants 
     that may be exercised within the 60-day period following December 31, 
     1996. 
    

   
 (2) Consists of the following shares and warrants exercisable within the 
     60-day period following December 31, 1996: 1,440,897 shares and a 
     warrant to purchase 12,213 shares held by Accel IV L.P.; 58,200 shares 
     and a warrant to purchase 493 shares held by Accel Investors '93 L.P.; 
     34,604 shares and a warrant to purchase 293 shares held by Ellmore C. 
     Patterson Partners; 29,885 shares and a warrant to purchase 253 shares 
     held by 
    


                                      50 
<PAGE> 

   
     Accel Keiretsu L.P.; and 9,435 shares and a warrant to purchase 80 
     shares held by Prosper Partners. Accel IV Associates L.P. is the General 
     Partner of Accel IV L.P. and has voting and investment control over the 
     shares held by Accel IV L.P. Arthur C. Patterson, James R. Swartz, James 
     W. Bryer, Paul H. Klingenstein, Luke B. Evnin, Eugene D. Hill, III, G. 
     Carter Sednaoui and the Swartz Family Partnership L.P. are the General 
     Partners of Accel IV Associates L.P. Messrs. Patterson, Swartz, 
     Klingenstein, Bryer, Evnin and Sednaoui are the General Partners of 
     Accel Investors '93 L.P. and have voting and investment control over 
     shares held by Accel Investors '93 L.P. Mr. Patterson is the sole 
     General Partner of Ellmore C. Patterson Partners and has voting and 
     investment control over shares held by Ellmore C. Patterson Partners. 
     Accel Partners & Co. L.P. is the General Partner of Accel Keiretsu L.P. 
     and has voting and investment control over shares held by Accel Keiretsu 
     L.P. Messrs. Patterson and Swartz are the co-owners and partners of 
     Accel Partners & Co. L.P. Messrs. Klingenstein and Sednaoui are the 
     attorneys-in-fact for Prosper Partners and disclaim beneficial ownership 
     of shares held by Prosper Partners. 
    

   
 (3) Includes the following shares held by the following persons and entities 
     related to Bessemer Venture Partners III L.P. as to which Bessemer 
     Venture Partners III L.P. has voting and investment control: William T. 
     Burgin (1,969); Robert H. Buescher (3,366); G. Felda Hardymon (18,366); 
     Christopher F.O. Gabrieli (32,357); David J. Cowan (5,125); Brimstone 
     Island Co. L.P. (1,969); Gabrieli Family Foundation (6,604); Diane N. 
     McPartlin (528); Ravi B. Mhatre (666); Gautam A. Prakash (3,713); Robi 
     L. Soni (1,705); Rodney A. Cohen (1,222); Richard R. Davis (4,045); Adam 
     P. Godfrey (1,662); Barbara M. Henagan (2,997); Belisarius Corp. 
     (7,667); Robert J.S. Roriston (947); Russell D. Sternlicht (639); 
     Quentin Corp. (11,152); and BVP III Special Situations L.P. (26,465). 
     Also includes a warrant to purchase 13,333 shares exercisable within the 
     60-day period following December 31, 1996 held by Bessemer Venture 
     Partners III L.P. Does not include shares held by the following persons 
     related to Bessemer Venture Partners III L.P. as to which shares 
     Bessemer Venture Partners III L.P. does not possess voting or investment 
     control: Michael Barash (1,666); Neill H. Brownstein (6,184); C. 
     Samantha Chen (1,124); Rachel J. Erickson (660); and John K. Rodakis 
     (1,321). Messrs. Burgin, Buescher, Gabrieli, Hardymon and Cowen are the 
     voting General Partners of Deer III & Co., the General Partner of 
     Bessemer Venture Partners III L.P. and BVP III Special Situations L.P. 
     and disclaim beneficial ownership of shares and the warrant held by 
     Bessemer Venture Partners III L.P. and shares held by BVP III Special 
     Situations L.P. except to the extent of their partnership interest. 
    

 (4) Osamu Ikeda, M.D., President and Chief Executive Officer of Daiichi 
     Radioisotope Laboratories, Ltd., has voting and investment control over 
     these shares. 

   
 (5) Includes the ownership by the following venture capital funds managed by 
     Advent International Corporation: 249,125 shares held by Rovent II 
     Limited Partnership, 136,506 shares held by Advent Performance Materials 
     Limited Partnership, 45,501 shares held by Adwest Limited Partnership, 
     23,877 shares held by Advent Partners Limited Partnership. In its 
     capacity as manager of these funds, Advent International Corporation 
     exercises sole voting and investment power with respect to all shares 
     held by these funds. Advent International Corporation exercises its 
     voting and investment power through a group of three persons, none of 
     whom may act independently and a majority of whom must act in concert to 
     exercise voting or investment power over the beneficial holdings of such 
     entity. Therefore, no individual in this group is deemed to share voting 
     or investment power. 
    

   
 (6) Includes 16,375 shares subject to option exercisable within the 60-day
     period following December 31, 1996 held by FMR Corp. FMR Corp. is the 
     parent and sole owner of Fidelity Capital Associates, Inc., the General
     Partner of Fidelity Ventures Ltd.

 (7) Includes 105,176 shares subject to options exercisable within the 60-day 
     period following December 31, 1996. 
    

 (8) Includes 26,666 shares held by Dr. Lauffer's wife and 16,000 shares held 
     in a trust for the benefit of Dr. Lauffer's children as to which Dr. 
     Lauffer disclaims beneficial ownership. Also includes 1,000,000 shares 
     held by a trust for the benefit of Dr. Lauffer as to which shares Dr. 
     Lauffer has voting and investment control. 

 (9) See footnote (3) above. Mr. Gabrieli disclaims beneficial ownership of 
     these shares except to the extent of his proportionate pecuniary 
     interest therein or with respect to shares held in his name. 

(10) See footnote (2) above. Dr. Evnin disclaims beneficial ownership of 
     these shares except to the extent of his proportionate pecuniary 
     interest in shares held by Accel IV L.P. and Accel Investors '93 L.P. 

   
(11) Consists of options exercisable within the 60-day period following 
     December 31, 1996. 
    

   
(12) See footnotes (2), (3) and (7)--(11) above. Includes an additional 
     140,464 shares subject to options exercisable within the 60-day period 
     following December 31, 1996. 
    


                                      51 
<PAGE> 

                         DESCRIPTION OF CAPITAL STOCK 

   
  The authorized capital stock of the Company currently consists of 15,000,000 
shares of Common Stock, $0.01 par value per share, and 6,813,393 shares of 
Preferred Stock, $0.01 par value per share. Upon the closing of this 
offering, the authorized capital stock of the Company will consist of 
15,000,000 shares of Common Stock and 1,000,000 shares of Preferred Stock 
after giving effect to the amendment and restatement of the Company's 
Restated Certificate of Incorporation to delete references to the Series A, 
Series B, Series C, Series D and Series E Convertible Preferred Stock. Prior 
to this offering, there were outstanding an aggregate of (i) 1,564,451 shares 
of Common Stock and (ii) 6,738,076 shares of Preferred Stock, consisting of 
93,691 shares of Series A Convertible Preferred Stock, 2,643,736 shares of 
Series B Convertible Preferred Stock, 1,432,318 shares of Series C 
Convertible Preferred Stock, 1,700,002 shares of Series D Convertible 
Preferred Stock and 868,329 shares of Series E Convertible Preferred Stock, 
which shares will automatically convert into an aggregate of 4,750,288 shares 
of Common Stock upon the closing of this offering. As of the date of this 
Prospectus, the Company had 60 shareholders. Upon the closing of this 
offering, the Company will have 8,314,739 shares of Common Stock outstanding. 
    

  The following summary of certain provisions of the Common Stock and 
Preferred Stock does not purport to be complete and is subject to, and 
qualified in its entirety by (i) the provisions of the Company's Restated 
Certificate and By-laws (each as filed and effected, respectively, on or 
before the closing of this offering and included as exhibits to the 
Registration Statement) and (ii) the provisions of applicable law. 

Common Stock 

  Holders of Common Stock are entitled to one vote per share on matters to be 
voted upon by the stockholders. There are no cumulative voting rights. 
Holders of Common Stock are entitled to receive dividends if, as and when 
declared by the Board of Directors out of funds legally available therefor. 
See "Dividend Policy." Upon the liquidation, dissolution or winding up of the 
Company, holders of Common Stock are entitled to share ratably in the assets 
of the Company available for distribution to its stockholders, subject to the 
preferential rights of any then outstanding shares of Preferred Stock. No 
shares of Preferred Stock will be outstanding immediately following the 
closing of this offering. The Common Stock outstanding upon the effective 
date of the Registration Statement, and the shares offered by the Company 
hereby, upon issuance and sale, will be fully paid and nonassessable. 

Preferred Stock 

   
  The Company is currently authorized to issue 6,813,393 shares of Preferred 
Stock. Upon the consummation of the offering, all of the issued and 
outstanding shares of Preferred Stock will be converted into an aggregate of 
4,750,289 shares of Common Stock. Immediately following such conversion, all 
currently outstanding shares of Preferred Stock will be cancelled, retired 
and eliminated from the Company's authorized shares of capital stock and the 
number of authorized shares of Preferred Stock will be decreased to 1,000,000 
shares. 
    

  Upon consummation of the offering, the Company's Board of Directors will 
have the authority to issue up to 1,000,000 shares of Preferred Stock in one 
or more series and to fix the relative rights, preferences, privileges, 
qualifications, limitations and restrictions thereof, including dividend 
rights, dividend rates, conversion rights, voting rights, terms of 
redemption, redemption prices, liquidation preferences, sinking fund terms 
and the number of shares constituting any series or the designation of such 
series, without further vote or action by the stockholders. The Company 
believes that the power to issue Preferred Stock will provide flexibility in 
connection with possible corporate transactions. The issuance of Preferred 
Stock could adversely affect the voting power of the holders of Common Stock 
and restrict their rights to receive payment upon liquidation and could have 
the effect of delaying, deferring or preventing a change-in-control of the 
Company. See "Description of Capital Stock--Anti-Takeover Measures." The 
Company has no present plans to issue any shares of Preferred Stock. 

Stock Purchase Warrants 

  During the period from December 1992 to May 1996, the Company issued 
warrants to purchase an aggregate of 75,317 shares of Preferred Stock in 
connection with equipment leasing transactions and equity financings, 
including (i) two warrants exercisable for an aggregate amount of 10,697 
shares of Company's Series A Convertible Preferred Stock at an exercise price 
of $11.21. per share (which will be exercisable for an aggregate of 36,618 
shares of Common Stock at an exercise price of $3.27 per share upon 
consummation of this offering), (ii) a warrant exercisable for 11,402 shares 
of Company's Series B Convertible Preferred Stock at an exercise price of 
$1.51 per share (which will be exercisable for 7,601 shares of Common Stock 
at an exercise price of $2.27 upon consummation of this offering), (iii) a 
warrant exercisable for 13,218 shares of Company's Series C 

                                      52 
<PAGE> 

Convertible Preferred Stock at an exercise price of $4.54 per share (which 
will be exercisable for 8,812 shares of Common Stock at an exercise price of 
$6.81 upon consummation of this offering) and (iv) six warrants exercisable 
for an aggregate of 40,000 shares of Company's Series D Convertible Preferred 
Stock at an exercise price of $3.00 per share (which will be exercisable for 
an aggregate of 26,665 shares of Common Stock at an exercise price of $4.50 
upon consummation of this offering) (collectively, the "Preferred Stock 
Warrants"). The Preferred Stock Warrants will expire five years after the 
date of the closing of the offering. The exercise price of each Preferred 
Stock Warrant is subject to adjustment in the event of a stock split, 
combination or dividend by the Company. The number and kind of securities for 
which each Preferred Stock Warrant is exercisable is subject to adjustment in 
the event of a merger or reclassification by the Company. 

Anti-Takeover Measures 

  In addition to the Board of Directors' ability to issue shares of Preferred 
Stock, the Restated Certificate and the By-laws contain several other 
provisions that are commonly considered to discourage unsolicited takeover 
bids. The Restated Certificate includes a provision classifying the Board of 
Directors into three classes with staggered three- year terms, and the 
By-laws include a provision prohibiting stockholder action by written consent 
except as otherwise provided by law. Under the Restated Certificate and 
By-laws, the Board of Directors may enlarge the size of the Board and fill 
any vacancies on the Board. The Restated Certificate requires the approval of 
the holders of at least 66-2/3% of the outstanding capital stock of the 
Company prior to (i) the merger of the Company into another entity, (ii) the 
sale or disposition of all or substantially all of the Company's assets, 
(iii) the issuance or transfer by the Company of its securities having a 
market value in excess of $500,000 and (iv) engaging in any other business 
combination transaction, unless such transaction has been approved by a 
majority of the Board of Directors. Further, provisions of the By-laws and 
the Restated Certificate provide that the stockholders may amend the By-laws 
or certain provisions of the Restated Certificate only with the affirmative 
vote of 66-2/3% of the Company's capital stock. The By-laws provide that 
nominations for directors may not be made by stockholders at any annual or 
special meeting unless the stockholder intending to make a nomination 
notifies the Company of its intention a specified period in advance and 
furnishes certain information. The By-laws also provide that special meetings 
of the Company's stockholders may be called only by the President or the 
Board of Directors and require advance notice of business to be brought by a 
stockholder before the annual meeting. 

  Upon the consummation of the offering made hereby, the Company will be 
subject to the provisions of Section 203 of the Delaware General Corporation 
Law, a law regulating corporate takeovers (the "Anti-Takeover Law"). In 
certain circumstances, the Anti-Takeover Law prevents certain Delaware 
corporations, including those whose securities are listed on the Nasdaq 
National Market, from engaging in a "business combination" (which includes a 
merger or sale of more than ten percent of the corporation's assets) with an 
"interested stockholder" (a stockholder who owns 15% or more of the 
corporation's outstanding voting stock) for three years following the date on 
which such stockholder became an "interested stockholder" subject to certain 
exceptions, unless the transaction is approved by the board of directors and 
the holders of at least 66-2/3% of the outstanding voting stock of the 
corporation (excluding shares held by the interested stockholder). The 
statutory ban does not apply if, upon consummation of the transaction in 
which any person becomes an interested stockholder, the interested 
stockholder owns at least 85% of the outstanding voting stock of the 
corporation (excluding shares held by persons who are both directors and 
officers or by certain employee stock plans). A Delaware corporation subject 
to the Anti-Takeover Law may "opt out" of the Anti-Takeover Law with an 
express provision either in its certificate of incorporation or by-laws 
resulting from a stockholders' amendment approved by at least a majority of 
the outstanding voting shares; such an amendment is effective following 
expiration of twelve months from adoption. The Company has not "opted out" of 
the Anti-Takeover Law. 

  The foregoing provisions of the Restated Certificate and By-laws and 
Delaware law could have the effect of discouraging others from attempting 
hostile takeovers of the Company and, as a consequence, they may also inhibit 
temporary fluctuations in the market price of the Common Stock that might 
result from actual or rumored hostile takeover attempts. Such provisions may 
also have the effect of preventing changes in the management of the Company. 
It is possible that such provisions could make it more difficult to 
accomplish transactions which stockholders may otherwise deem to be in their 
best interests. 

Transfer Agent 

  The transfer agent and registrar for the Common Stock is Boston EquiServe. 

                                      53 
<PAGE> 

                       SHARES ELIGIBLE FOR FUTURE SALE 

   
  Upon completion of this offering, the Company will have 8,314,740 shares of 
Common Stock outstanding, assuming no exercise of the Underwriters' 
over-allotment option or of any other outstanding options. Of these shares, 
the 2,000,000 shares sold in this offering will be freely transferable, 
without restriction or further registration under the Securities Act, except 
for shares purchased by "affiliates" of the Company as that term is defined 
in Rule 144 under the Securities Act. 
    

   
  The remaining 6,314,740 outstanding shares of Common Stock are owned by 
existing stockholders and are deemed "Restricted Shares" under Rule 144. 
These may not be resold, except pursuant to an effective registration 
statement or an applicable exemption from registration. Of these remaining 
shares, approximately 112,357 shares of Common Stock will be eligible for 
sale under Rules 144 and 701 on the ninety-first day after the effectiveness 
of this offering. Stockholders of the Company, holding in the aggregate 
6,202,383 shares of Common Stock, have agreed to enter into the 180-day 
lock-up agreements described below. At the end of such 180-day period, an 
additional 3,950,721 shares of Common Stock will be eligible for sale under 
Rules 144 and 701. The remaining Restricted Shares will become eligible from 
time to time thereafter upon the expiration of the minimum two-year holding 
period prescribed by Rule 144. 
    

  In general, under Rule 144, as currently in effect, a person (or persons 
whose shares are aggregated), including an affiliate, who has beneficially 
owned Restricted Shares for at least two years from the later of the date 
such Restricted Shares were acquired from the Company and (if applicable) the 
date they were acquired from an affiliate, is entitled to sell, within any 
three-month period, a number of shares that does not exceed the greater of 1% 
of the then outstanding shares of Common Stock or the average weekly trading 
volume in the public market during the four calendar weeks preceding such 
sale. Sales under Rule 144 are also subject to certain requirements as to the 
manner and notice of sale and the availability of public information 
concerning the Company. All sales of shares of the Company's Common Stock, 
including Restricted Shares, held by affiliates of the Company must be sold 
under Rule 144, subject to the foregoing volume limitations and other 
restrictions. 

   
  The Commission has proposed an amendment to Rule 144 which would reduce the 
holding period required for shares subject to Rule 144 from two years to one 
year. If this proposal is adopted as of the expected closing of this 
offering, an additional 1,946,033 shares of Common Stock would become 
eligible for sale by existing stockholders to the public after the expiration 
of the 180-day lock-up period. 
    

  The Company's directors and executive officers and certain of its 
stockholders have agreed that they will not, without the prior written 
consent of the representatives of the Underwriters, offer to sell, sell, 
contract to sell, grant any option to sell or otherwise dispose of or require 
the Company to file with the Commission a registration statement under the 
Securities Act to register any shares of Common Stock or securities 
convertible or exchangeable for shares of Common Stock or warrants or other 
rights to acquire shares of Common Stock during the 180-day period following 
the effective date of the Registration Statement. 

  The Company plans to file registration statements under the Securities Act 
to register approximately 1,427,322, 66,666 and 66,666 shares of Common Stock 
issuable under the Equity Plan, the Director Plan and the Stock Purchase 
Plan, respectively, 90 days after the date of this Prospectus. Upon 
registration, such shares will be eligible for immediate resale upon 
exercise, subject, in the case of affiliates, to the volume, manner of sale 
and notice requirements of Rule 144. 

   
  No prediction can be made as to the effect, if any, that market sales of 
additional shares or the availability of such additional shares for sale will 
have on the market price of the Common Stock. Nevertheless, sales of 
substantial amounts of Common Stock in the public market may have an adverse 
impact on the market price for the Common Stock. See "Risk Factors--Shares 
Eligible for Future Sale; Registration Rights" and "-- Immediate and 
Substantial Dilution." 
    

Registration Rights 

   
  The holders of the 4,750,289 shares of Common Stock to be issued on 
conversion of the Series A Preferred Stock, Series B Preferred Stock, Series 
C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (the 
"Registrable Shares") are entitled to certain rights with respect to 
registration of the Registrable Shares under the Securities Act beginning at 
the end of the lock-up period. If the Company proposes to register any of its 
securities under the Securities Act, either for its own account or for the 
account of other security holders, 
    


                                      54 
<PAGE> 

such holders are entitled to notice of such registration and are entitled to 
include such Registrable Shares in the registration. The rights are subject 
to certain conditions and limitations, among them, the right of the 
underwriters of a registered offering to limit the number of shares included 
in such registration. Holders of Registrable Shares benefiting from these 
rights may also require the Company to file at its expense a registration 
statement under the Securities Act with respect to their shares of Common 
Stock and, subject to certain conditions and limitations, the Company is 
required to use its best efforts to effect such registration. Furthermore, 
such holders may, subject to certain conditions and limitations, require the 
Company to file additional registration statements on Form S-3 with respect 
to such Registrable Shares. Such holders did not have the right to have 
shares of Common Stock registered under the Securities Act as part of this 
offering. 

                                      55 
<PAGE> 

                                 UNDERWRITING 

  Subject to the terms and conditions of the Underwriting Agreement, the 
Underwriters named below, through their Representatives, Hambrecht & Quist 
LLC and Wessels, Arnold & Henderson, L.L.C., have severally agreed to 
purchase from the Company the following respective numbers of shares of 
Common Stock: 

                                                Number of 
       Name                                       Shares 
       --------------------------------------- ----------- 
       Hambrecht & Quist LLC 
       Wessels, Arnold & Henderson, L.L.C. 

                                               ----------- 
       Total                                    2,000,000 
                                               =========== 

  The Underwriting Agreement provides that the obligations of the Underwriters 
are subject to certain conditions precedent, including the absence of any 
material adverse change in the Company's business and the receipt of certain 
certificates, opinions and letters from the Company, its counsel and 
independent auditors. The nature of the Underwriters' obligation is such that 
they are committed to purchase all shares of Common Stock offered hereby if 
any of such shares are purchased. 

  The Underwriters propose to offer the shares of Common Stock directly to the 
public at the initial public offering price set forth on the cover page of 
this Prospectus and to certain dealers at such price less a concession not in 
excess of $     per share. The Underwriters may allow, and such dealers may 
reallow, a concession not in excess of $     per share to certain other 
dealers. After the initial public offering of the shares, the offering price 
and other selling terms may be changed by the Representatives of the 
Underwriters. The Representatives have informed the Company that the 
Underwriters do not intend to confirm sales to accounts over which they 
exercise discretionary authority. 

  The Company has granted to the Underwriters an option, exercisable no later 
than 30 days after the date of this Prospectus, to purchase up to 300,000 
additional shares of Common Stock at the initial public offering price, less 
the underwriting discount, set forth on the cover page of this Prospectus. To 
the extent that the Underwriters exercise this option, each of the 
Underwriters will have a firm commitment to purchase approximately the same 
percentage thereof which the number of shares of Common Stock to be purchased 
by it shown in the above table bears to the total number of shares of Common 
Stock offered hereby. The Company will be obligated, pursuant to the option, 
to sell shares to the Underwriters to the extent the option is exercised. The 
Underwriters may exercise such option only to cover over-allotments made in 
connection with the sale of shares of Common Stock offered hereby. 

  The offering of the shares is made for delivery when, as and if accepted by 
the Underwriters and subject to prior sale and to withdrawal, cancellation or 
modification of the offering without notice. The Underwriters reserve the 
right to reject an order for the purchase of shares in whole or in part. 

  The Company has agreed to indemnify the Underwriters against certain 
liabilities, including liabilities under the Securities Act, and to 
contribute to payments the Underwriters may be required to make in respect 
thereof. 

  Certain existing stockholders of the Company, including the executive 
officers and directors, who will own in the aggregate 6,202,383 shares of 
Common Stock after the offering, have agreed that they will not, without the 
prior written consent of Hambrecht & Quist LLC, offer, sell or otherwise 
dispose of any shares of Common Stock, options or warrants to acquire shares 
of Common Stock or securities exchangeable for or convertible into shares of 
Common Stock owned by them during the 180-day period following the date of 
this Prospectus. The Company has agreed that, it will not, without the prior 
written consent of Hambrecht & Quist LLC, offer, sell or otherwise dispose of 
any shares of Common Stock, options or warrants to acquire shares of Common 
Stock or securities exchangeable for or convertible into shares of Common 
Stock, other than pursuant to its equity benefit plans, during the 180-day 
period following the date of this Prospectus. 

  Prior to this offering, there has been no public market for the Common 
Stock. The initial public offering price for the Common Stock will be 
determined by negotiation among the Company and the Representatives. 

                                      56 
<PAGE> 

Among the factors to be considered in determining the initial public offering 
price are prevailing market and economic conditions, revenues and earnings of 
the Company, market valuations of other companies engaged in activities 
similar to those of the Company, estimates of the business potential and 
prospects of the Company, the present state of the Company's business 
operations, the Company's management and other factors deemed relevant. The 
estimated initial public offering price range set forth on the cover of this 
preliminary prospectus is subject to change as a result of market conditions 
and other factors. 

                                LEGAL MATTERS 

  The validity of the shares of Common Stock offered hereby will be passed 
upon for the Company by Palmer & Dodge LLP, Boston, Massachusetts. William T. 
Whelan, a partner of Palmer & Dodge LLP, is an Assistant Secretary of the 
Company. Certain legal matters are being passed upon for the Underwriters by 
Hale and Dorr LLP, Boston, Massachusetts. 

                                   EXPERTS 

  The financial statements of the Company at December 31, 1995 and March 31, 
1995 and for the nine months ended December 31, 1995, and for each of the two 
years in the period ended March 31, 1995 appearing in this Prospectus and 
Registration Statement have been audited by Ernst & Young LLP, independent 
auditors, as set forth in their report thereon appearing elsewhere herein, 
and are included in reliance upon such report given upon the authority of 
such firm as experts in accounting and auditing. 

                            ADDITIONAL INFORMATION 

  The Company has filed with the Securities and Exchange Commission (the 
"Commission") a Registration Statement on Form S-1 (the "Registration 
Statement") under the Securities Act, with respect to the shares of Common 
Stock offered hereby. This Prospectus does not contain all of the information 
set forth in the Registration Statement and the exhibits and schedules 
thereto. For further information with respect to the Company and the Common 
Stock offered hereby, reference is made to the Registration Statement and the 
exhibits and schedules thereto. All statements made in this Prospectus 
regarding the contents of any contract, agreement or other document filed as 
an exhibit to the Registration Statement are qualified by reference to the 
copy of such document filed as an exhibit to the Registration Statement. A 
copy of the Registration Statement may be inspected without charge at the 
offices of the Commission, 450 Fifth Street, N.W., Washington, D.C. 20549, 
and copies of all or any part thereof may be obtained from the Commission 
upon the payment of certain fees prescribed by the Commission. Such reports 
and other information can also be reviewed through the Commission's Web site 
(http://www.sec.gov). 

  Statements made in this Prospectus as to the contents of any contract, 
agreement or other document referred to are not necessarily complete. With 
respect to each such contract, agreement or other document filed as an 
exhibit to the Registration Statement, reference is made to the exhibit for a 
more complete description of the matter involved, and each such statement 
shall be deemed qualified in its entirety by such reference. 

  The Company intends to distribute to its stockholders annual reports 
containing financial statements audited by its independent auditors and will 
make available copies of quarterly reports for the first three quarters of 
each fiscal year containing unaudited financial information. 

                                      57 
<PAGE> 

                     [THIS PAGE INTENTIONALLY LEFT BLANK] 

<PAGE> 







                              EPIX MEDICAL, INC.
                     (A Company in the Development Stage)

                        INDEX TO FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
                                                                  Page
                                                                ---------
<S>                                                               <C>
Report of Independent Auditors                                     F-3
Financial Statements
Balance Sheets                                                     F-4
Statements of Operations                                           F-5
Statements of Redeemable Convertible Preferred
  Stock and Stockholders' Equity (Deficit)                         F-6
Statements of Cash Flows                                           F-8
Notes to Financial Statements                                     F-10
</TABLE>

                                     F-1
<PAGE>

                      [THIS PAGE INTENTIONALLY LEFT BLANK]

                                     F-2
<PAGE>

                        REPORT OF INDEPENDENT AUDITORS

Board of Directors and Stockholders
EPIX Medical, Inc.

     We have audited the accompanying balance sheets of EPIX Medical, Inc. (a
company in the development stage) as of December 31, 1995 and March 31, 1995,
and the related statements of operations, redeemable convertible preferred stock
and stockholders' equity (deficit), and cash flows for the nine months ended
December 31, 1995, and each of the two years in the period ended March 31, 1995.
These financial statements are the responsibility of the Company's management.
Our responsibility is to express an opinion on these financial statements based
on our audits.

     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

     Since the date of completion of the audit of the accompanying financial
statements and initial issuance of our report thereon dated April 12, 1996,
except for Note 14, as to which the date is May 14, 1996, which report contained
an explanatory paragraph regarding the Company's ability to continue as a going
concern, the Company, as discussed in Note 14, has received significant proceeds
from the sale of Preferred Stock and from strategic collaboration agreements.
Therefore the conditions that raised substantial doubt about whether the Company
will continue as a going concern no longer exist.

     In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of EPIX Medical, Inc. at
December 31, 1995 and March 31, 1995, and the results of its operations and its
cash flows for the nine months ended December 31, 1995, and each of the two
years in the period ended March 31, 1995, in conformity with generally accepted
accounting principles.

                                       /s/Ernst & Young LLP
                                       ---------------------------
                                       Ernst & Young LLP

Boston, Massachusetts
April 12, 1996, except for Note 14, as
 to which the date is August 30, 1996

                                     F-3
<PAGE>

                              EPIX MEDICAL, INC.
                     (A Company in the Development Stage)

                                BALANCE SHEETS

<TABLE>
   
<CAPTION>
                                                                        March 31      December 31    September 30
                                                                          1995           1995            1996
                                                                     -------------- --------------  --------------
Assets                                                                                               (Unaudited)
<S>                                                                    <C>            <C>            <C>
Current assets:
  Cash and cash equivalents                                            $ 1,079,355    $   149,686    $11,734,558
  Accounts receivable                                                                                    665,088
  Prepaid expenses                                                          49,496         58,940         74,695
  Other current assets                                                      23,000         13,178         10,267
                                                                       -----------    -----------    -----------
      Total current assets                                               1,151,851        221,804     12,484,608
Property and equipment, net                                                890,814        856,912        981,498
Notes receivable from officer                                                              51,878        290,437
Other assets                                                                98,082         80,171         58,735
                                                                       -----------    -----------    -----------
      Total assets                                                     $ 2,140,747    $ 1,210,765    $13,815,278
                                                                       ===========    ===========    ===========
Liabilities and Stockholders' Deficit                                                                (Unaudited)
Current liabilities:
  Current portion of capital lease obligations                         $   263,657    $   304,416    $   239,679
  Accounts payable and accrued expenses                                    372,183      1,244,201      1,362,574
                                                                       -----------    -----------    -----------
      Total current liabilities                                            635,840      1,548,617      1,602,253
Capital lease obligations, less current portion                            107,120        342,256        198,459
Promissory notes                                                                        2,700,000
Redeemable convertible preferred stock:
  Series B, $.01 par value, 2,655,138 shares authorized; 2,643,736
    shares issued and outstanding at March 31, 1995, December 31,
    1995 and September 30, 1996 ($6,170,731 liquidation value at
    September 30, 1996)                                                  3,949,383      3,955,505      3,961,636
  Series C, $.01 par value, 1,445,536 shares authorized; 1,432,318
    shares issued and outstanding at September 30, 1996 ($3,485,238
    liquidation value at September 30, 1996)                                                           3,233,694
  Series D, $.01 par value, 1,740,002 shares authorized; 1,700,002
    shares issued and outstanding at September 30, 1996 ($5,515,452
    liquidation value at September 30, 1996)                                                           5,071,027
  Series E, $.01 par value, 868,329 shares authorized; 868,329
    shares issued and outstanding at September 30, 1996 ($5,319,631
    liquidation value at September 30, 1996)                                                           4,899,755
Stockholders' deficit:
  Series A convertible preferred stock, $.01 par value, 104,388
    shares authorized; 93,691 shares issued and outstanding at March
    31, 1995, December 31, 1995 and September 30, 1996                   1,037,664      1,037,664      1,037,664
  Common stock, $.01 par value, 15,000,000 shares authorized;
    1,441,686, 1,563,808 and 1,539,673 shares issued and outstanding
    at March 31, 1995, December 31, 1995 and September 30, 1996,
    respectively                                                            14,417         15,638         15,396
  Additional paid-in capital                                                84,606        198,418         93,990
  Accretion of dividends on redeemable convertible preferred stock          (8,147)       (14,269)       (63,364)
  Deficit accumulated during the development stage                      (3,680,136)    (8,573,064)    (6,235,232)
                                                                       -----------    -----------    -----------
      Total stockholders' deficit                                       (2,551,596)    (7,335,613)    (5,151,546)
                                                                       -----------    -----------    -----------
      Total liabilities and stockholders' deficit                      $ 2,140,747    $ 1,210,765    $13,815,278
                                                                       ===========    ===========    ===========
</TABLE>
    


                           See accompanying notes.

                                     F-4
<PAGE>

                              EPIX MEDICAL, INC.
                     (A Company in the Development Stage)

                           STATEMENTS OF OPERATIONS

<TABLE>
<CAPTION>
                                                                                                                 Period from
                                                                                                                  Inception
                                                                Nine months                                     (November 29,
                                 Year ended     Year ended         ended               Nine months ended          1988) to
                                  March 31       March 31       December 31              September 30           September 30
                                    1994           1995            1995               1995           1996           1996
                                ----------------------------   ---------------   --------------- -------------  ---------------
                                                                                          (Unaudited)            (Unaudited)
<S>                              <C>            <C>             <C>                <C>            <C>            <C>
Revenues                         $1,700,000     $   411,509     $   900,000        $   900,000    $9,635,088     $13,646,597
Operating expenses:
 Research and development         1,381,528       2,407,113       4,164,940          2,989,257     4,951,652      13,374,909
 General and administrative         897,117         824,769       1,504,811          1,348,358     2,212,086       6,280,189
                                 -----------    -----------     -----------        -----------    -----------    -----------
   Total operating expenses       2,278,645       3,231,882       5,669,751          4,337,615     7,163,738      19,655,098
                                 -----------    -----------     -----------        -----------    -----------    -----------
Operating income (loss)            (578,645)     (2,820,373)     (4,769,751)        (3,437,615)    2,471,350      (6,008,501)
Interest expense                    (66,976)        (78,672)       (151,057)          (100,077)     (273,640)       (570,345)
Interest income                      29,141         120,845          27,880             62,943       140,122         359,081
                                 -----------    -----------     -----------        -----------    -----------    -----------
Net income (loss)                $ (616,480)    $(2,778,200)    $(4,892,928)       $(3,474,749)   $2,337,832     $(6,219,765)
                                 ===========    ===========     ===========        ===========    ===========    ===========
Pro forma (unaudited):
 Net income (loss) per share                                    $     (0.70)                      $     0.30
                                                                ===========                       ===========
 Weighted-average common
   stock and equivalents                                          6,973,000                        7,711,000
                                                                ===========                       ===========
</TABLE>

                           See accompanying notes.

                                     F-5
<PAGE>

                              EPIX MEDICAL, INC.
                     (A Company in the Development Stage)

              STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK
                       AND STOCKHOLDERS' EQUITY (DEFICIT)

<TABLE>
<CAPTION>
   
                                                  Redeemable            Series A
                                                 Convertible           Convertible
                                               Preferred Stock       Preferred Stock      Common Stock
                                            ----------------------  ------------------ ------------------
                                             Shares      Amount    Shares    Amount     Shares    Amount
                                            --------- ------------  ------ ----------- --------- --------
<S>                                         <C>        <C>         <C>     <C>         <C>        <C>
Issuance of common stock in May 1989                                                     333,330  $ 3,333
Issuance of Series A preferred stock in
  March 1992 (net of legal costs of
  $12,336)                                                         93,691  $1,037,664
Cumulative net loss for the period
  November 29, 1988 (date of inception)
  through March 31, 1992
                                            --------- ------------  ------ ----------- --------- --------
Balance at March 31, 1992                                          93,691   1,037,664    333,330    3,333
Issuance of common stock in April 1992 as
  payment for consulting services received                                                 5,186       52
Net loss
                                            --------- ------------  ------ ----------- --------- --------
Balance at March 31, 1993                                          93,691   1,037,664    338,516    3,385
Issuance of common stock in February 1994
  as payment for consulting services
  received                                                                                 5,186       52
Three-for-one stock dividend declared and
  paid in March 1994                                                                   1,031,118   10,311
Issuance of Series B preferred stock in
  March 1994, net of issuance costs of
  $58,764                                   2,643,736  $ 3,941,236
Issuance of warrants in conjunction with
  financing
Net loss
                                            --------- ------------  ------ ----------- --------- --------
Balance at March 31, 1994                   2,643,736    3,941,236 93,691   1,037,664  1,374,820   13,748
Issuance of common stock upon exercise of
  options                                                                                 66,866      669
Issuance of warrants in conjunction with
  financing
Accretion of redeemable convertible
  preferred stock to redemption value                        8,147
Net loss
                                            --------- ------------  ------ ----------- --------- --------
Balance at March 31, 1995                   2,643,736    3,949,383 93,691   1,037,664  1,441,686   14,417


                                                       Cumulative
                                                      Accretion of
                                                      Dividends on    Deficit 
                                                       Redeemable   Accumulated      Total 
                                           Additional  Convertible     During    Stockholders' 
                                             Paid-in    Preferred   Development      Equity 
                                             Capital      Stock        Stage       (Deficit) 
                                            --------- ------------ -------------  ------------- 
<S>                                          <C>         <C>         <C>           <C>
Issuance of common stock in May 1989         $1,667                                    $5,000 


Issuance of Series A preferred stock in                         
  March 1992 (net of legal costs of $12,336)                                        1,037,664 
Cumulative net loss for the period                                   
  November 29, 1988 (date of inception)                          
  through March 31, 1992                                               $(27,911)      (27,911) 
                                            --------- ------------ -------------  ------------- 
Balance at March 31, 1992                     1,667                     (27,911)    1,014,753 
Issuance of common stock in April 1992 as 
  payment for consulting services received       26                                        78 
Net loss                                                               (242,078)     (242,078) 
                                            --------- ------------ -------------  ------------- 
Balance at March 31, 1993                     1,693                    (269,989)      772,753 
Issuance of common stock in February 1994 
  as payment for consulting services 
  received                                       26                                        78 
Three-for-one stock dividend declared and 
  paid in March 1994                          5,156                     (15,467) 
Issuance of Series B preferred stock in 
  March 1994, net of issuance costs of 
  $58,764 
Issuance of warrants in conjunction with 
  financing                                  43,391                                    43,391 
Net loss                                                               (616,480)     (616,480) 
                                            --------- ------------ -------------  ------------- 
Balance at March 31, 1994                    50,266                    (901,936)      199,742 
Issuance of common stock upon exercise of 
  options                                    27,415                                    28,084 
Issuance of warrants in conjunction with 
  financing                                   6,925                                     6,925 
Accretion of redeemable convertible 
  preferred stock to redemption value                    $(8,147)                      (8,147) 
Net loss                                                             (2,778,200)   (2,778,200) 
                                            --------- ------------ -------------  ------------- 
Balance at March 31, 1995                    84,606       (8,147)    (3,680,136)   (2,551,596) 

    



                                     F-6 


<PAGE> 
   
<S>                                         <C>       <C>          <C>     <C>         <C>       <C>

Issuance of common stock upon exercise of 
  options                                                                                 38,399      384 
Issuance of common stock in July 1995 
  under license agreement                                                                 83,723      837 
Accretion of redeemable convertible 
  preferred stock to redemption value                        6,122 
Issuance of warrants in conjunction with 
  financing 
Net loss 
                                            --------- ------------  ------ ----------- --------- -------- 
Balance at December 31, 1995                2,643,736    3,955,505 93,691   1,037,664  1,563,808   15,638 


Issuance of common stock upon exercise of 
  options (unaudited)                                                                     42,531      425 
Issuance of Series C preferred stock upon 
  conversion of Convertible Notes and 
  interest thereon in May 1996, net of 
  issuance costs of $12,560 (unaudited)     1,432,318    3,210,177 
Issuance of warrants in conjunction with 
  financing (unaudited) 
Issuance of Series D preferred stock for 
  cash in May 1996, net of issuance costs 
  of $31,043 (unaudited)                    1,500,002    4,468,963 
Issuance of Series D preferred stock upon 
  conversion of Bridge Notes in May 1996 
  (unaudited)                                 200,000      600,000 
Issuance of Series E preferred stock in 
  May and August 1996, net of issuance 
  costs of $117,628 (unaudited)               868,329    4,882,372 
Issuance of compensatory stock option 
  grants (unaudited) 
Repurchase of common stock from officer in 
  May 1996 (unaudited)                                                                   (66,666)    (667) 
Accretion of redeemable convertible 
  preferred stock to redemption value 
  (unaudited)                                               49,095 
Net income (unaudited) 
                                            --------- ------------  ------ ----------- --------- -------- 
Balance at September 30, 1996 (unaudited)   6,644,385  $17,166,112 93,691  $1,037,664  1,539,673  $15,396 
                                            ========= ============  ====== =========== ========= ======== 





<S>                                         <C>       <C>          <C>            <C>
Issuance of common stock upon exercise of 
  options                                      16,874                                  17,258 
Issuance of common stock in July 1995 
  under license agreement                      68,235                                  69,072 
Accretion of redeemable convertible 
  preferred stock to redemption value                     (6,122)                      (6,122) 
Issuance of warrants in conjunction with 
  financing                                    28,703                                  28,703 
Net loss                                                             (4,892,928)   (4,892,928) 
                                            --------- ------------ -------------  ------------- 
Balance at December 31, 1995                  198,418    (14,269)    (8,573,064)   (7,335,613) 
Issuance of common stock upon exercise of 
  options (unaudited)                          19,343                                  19,768 
Issuance of Series C preferred stock upon 
  conversion of Convertible Notes and 
  interest thereon in May 1996, net of 
  issuance costs of $12,560 (unaudited) 
Issuance of warrants in conjunction with 
  financing (unaudited)                        78,236                                  78,236 
Issuance of Series D preferred stock for 
  cash in May 1996, net of issuance costs 
  of $31,043 (unaudited) 
Issuance of Series D preferred stock upon 
  conversion of Bridge Notes in May 1996 
  (unaudited) 
Issuance of Series E preferred stock in 
  May and August 1996, net of issuance 
  costs of $117,628 (unaudited) 
Issuance of compensatory stock option 
  grants (unaudited)                           67,326                                  67,326 
Repurchase of common stock from officer in 
  May 1996 (unaudited)                       (269,333)                               (270,000) 
Accretion of redeemable convertible 
  preferred stock to redemption value 
  (unaudited)                                            (49,095)                     (49,095) 
Net income (unaudited)                                                2,337,832     2,337,832 
                                            --------- ------------ -------------  ------------- 
Balance at September 30, 1996 (unaudited)   $  93,990   $(63,364)   $(6,235,232)  $(5,151,546) 
                                            ========= ============ =============  ============= 
    
</TABLE>


                           See accompanying notes. 

                                     F-7 




<PAGE> 

                              EPIX MEDICAL, INC. 
                     (A Company in the Development Stage) 

                           STATEMENTS OF CASH FLOWS 

<TABLE>
<CAPTION>
                                                                    Nine months 
                                     Year ended     Year ended         ended 
                                      March 31       March 31       December 31 
                                        1994           1995             1995 
                                   -------------- ---------------  --------------- 

<S>                                <C>            <C>              <C>
Operating activities 
Net income (loss)                   $  (616,480)    $(2,778,200)    $(4,892,928) 
Adjustments to reconcile net 
  income (loss) to cash provided 
  (used) by operating activities: 
 Depreciation and  amortization         295,370         285,515         396,673 
 Expenses paid with equity 
   instruments                                                           67,816 
 Change in operating assets  and 
  liabilities: 
  Accounts receivable 
  Prepaid expenses and other 
    current assets                       50,928          (2,769)         16,411 
  Accounts payable and accrued 
    expenses                             80,922         (36,009)        872,018 
                                    -----------     -----------     ----------- 
Net cash provided (used) 
  by operating activities              (189,260)     (2,531,463)     (3,540,010) 
Investing activities 
Purchase of fixed assets               (106,299)       (367,830)       (324,429) 
Proceeds from sale leaseback of 
  fixed assets                          553,067          41,468         511,145 
Purchase of marketable securities    (2,356,510) 
Proceeds from sale of marketable 
  securities                                          2,356,510 
Issuance of note receivable from 
  officer                                                               (50,000) 
                                    -----------     -----------     ----------- 
Net cash provided (used) by 
  investing activities               (1,909,742)      2,030,148         136,716 
                                    -----------     -----------     ----------- 
</TABLE>

<TABLE>
<CAPTION>
                                  
                                  
                                  
                                                                   Period from 
                                                                    inception 
                                         Nine months ended        (November 29, 
                                           September 30              1988) to 
                                   -----------------------------   September 30 
                                        1995           1996            1996 
                                   --------------- -------------  --------------- 
                                            (Unaudited)            (Unaudited) 
<S>                                <C>             <C>             <C>
Operating activities 
Net income (loss)                    $(3,474,749)   $2,337,832     $(6,219,765) 
Adjustments to reconcile net 
  income (loss) to cash provided 
  (used) by operating activities: 
 Depreciation and  amortization          279,432       406,169       1,509,572 
 Expenses paid with equity 
   instruments                            67,816       136,526         204,342 
 Change in operating assets  and 
  liabilities: 
  Accounts receivable                                 (665,088)       (665,088) 
  Prepaid expenses and other 
    current assets                        16,357            32        (154,134) 
  Accounts payable and accrued 
    expenses                             185,999       341,110       1,585,311 
                                     -----------    -----------    ----------- 
Net cash provided (used) 
  by operating activities             (2,925,145)    2,556,581      (3,739,762) 
Investing activities 
Purchase of fixed assets                (402,969)     (542,812)     (2,230,971) 
Proceeds from sale leaseback of 
  fixed assets                           274,114        17,173       1,122,853 
Purchase of marketable securities                                   (2,356,510) 
Proceeds from sale of marketable 
  securities                           1,945,621                     2,356,510 
Issuance of note receivable from 
  officer                                (50,000)     (230,000)       (280,000) 
                                     -----------    -----------    ----------- 
Net cash provided (used) by 
  investing activities                 1,766,766      (755,639)     (1,388,118) 
                                     -----------    -----------    ----------- 
</TABLE>

                                     F-8 
<PAGE> 

                              EPIX MEDICAL, INC. 
                     (A Company in the Development Stage) 

                    STATEMENTS OF CASH FLOWS--(Continued) 

<TABLE>
<CAPTION>
                                                                            Nine months 
                                                Year ended    Year ended       ended 
                                                 March 31      March 31     December 31 
                                                   1994          1995          1995 
                                               ------------- -------------  ------------- 

<S>                                            <C>           <C>            <C>
Financing activities 
Repayment of capital lease obligations          $ (157,975)   $ (245,399)   $ (245,489) 
Proceeds from issuance of promissory notes                                   2,700,000 
Proceeds from issuance of bridge notes 
Proceeds from sale of Series B redeemable 
  convertible preferred stock                    3,941,236 
Proceeds from sale of Series D redeemable 
  convertible preferred stock 
Proceeds from sale of Series E redeemable 
  convertible preferred stock 
Proceeds from sale of Series A convertible 
  preferred stock 
Repurchase of stock from officer 
Sale of common stock                                              28,084        18,514 
Proceeds from issuance of warrants                                                 600 
                                                -----------   -----------   ----------- 
Net cash provided (used) by financing 
  activities                                     3,783,261      (217,315)    2,473,625 
                                                -----------   -----------   ----------- 
Increase (decrease) in cash and cash 
  equivalents                                    1,684,259      (718,630)     (929,669) 
Cash and cash equivalents at beginning of 
  period                                           113,726     1,797,985     1,079,355 
                                                -----------   -----------   ----------- 
Cash and cash equivalents at end of period      $1,797,985    $1,079,355    $  149,686 
                                                ===========   ===========   =========== 
Supplemental cash flow information 
Cash paid for interest                          $   66,976    $   78,672    $   51,441 
                                                ===========   ===========   =========== 
</TABLE>

<TABLE>
<CAPTION>
                                                                          Period from 
                                                Nine months ended          inception 
                                                   September 30           (November 29, 
                                           ----------------------------     1988) to 
                                                                         September 30 
                                               1995           1996           1996 
                                           ------------- --------------  -------------- 
                                                   (Unaudited)            (Unaudited) 
<S>                                        <C>           <C>
Financing activities 
Repayment of capital lease obligations      $ (200,315)   $  (217,173)    $  (869,763) 
Proceeds from issuance of promissory notes   1,500,000        300,000       3,000,000 
Proceeds from issuance of bridge notes                        600,000         600,000 
Proceeds from sale of Series B redeemable 
  convertible preferred stock                                               3,941,236 
Proceeds from sale of Series D redeemable 
  convertible preferred stock                               4,468,963       4,468,963 
Proceeds from sale of Series E redeemable 
  convertible preferred stock                               4,882,372       4,882,372 
Proceeds from sale of Series A convertible 
  preferred stock                                                           1,037,664 
Repurchase of stock from officer                             (270,000)       (270,000) 
Sale of common stock                            31,636         19,768          71,366 
Proceeds from issuance of warrants                                                600 
                                            -----------   -----------     ----------- 
Net cash provided (used) by financing 
  activities                                 1,331,321      9,783,930      16,862,438 
                                            -----------   -----------     ----------- 
Increase (decrease) in cash and cash 
  equivalents                                  172,942     11,584,872      11,734,558 
Cash and cash equivalents at beginning of 
  period                                       154,009        149,686              -- 
                                            -----------   -----------     ----------- 
Cash and cash equivalents at end of period  $  326,951    $11,734,558     $11,734,558 
                                            ===========   ===========     =========== 
Supplemental cash flow information 
Cash paid for interest                      $   47,885    $    81,319     $   278,408 
                                            ===========   ===========     =========== 
</TABLE>

                           See accompanying notes. 

                                     F-9 
<PAGE> 

                              EPIX MEDICAL, INC. 
                     (A Company in the Development Stage) 
                        NOTES TO FINANCIAL STATEMENTS 

1. BASIS OF PRESENTATION 

     EPIX Medical, Inc. ("EPIX" or the "Company") was formed on November 29,
1988 as a Delaware corporation and commenced operations in 1992. The Company is
developing targeted contrast agents both to improve the capability and expand
the use of magnetic resonance imaging ("MRI") as a diagnostic tool for a variety
of diseases. The Company's principal product under development, MS-325, is an
injectable contrast agent designed for multiple vascular imaging indications.

     The Company is a development-stage enterprise, as defined in Statement of
Financial Accounting Standards No. 7, and has, since inception, been engaged in
the research and development of its product candidates as well as seeking
regulatory clearances and patent protection and raising capital to fund
operations.

     Change of Year End

     Subsequent to March 31, 1995, the Company elected to change its fiscal year
end from March 31 to December 31.

     Use of Estimates

     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.

     Significant Revenues

     All of the revenues received during the year ended March 31, 1994 were
derived from a single source. For the year ended March 31, 1995 one source
represented 61% and another source represented 39% of the total revenues. All of
the revenues received during the nine months ended December 31, 1995 were
derived from a single source.

2. SIGNIFICANT ACCOUNTING POLICIES 

     Unaudited Interim Financial Statements

     The balance sheet as of September 30, 1996 and the related statements of
operations, redeemable convertible preferred stock and stockholders' equity
(deficit) and cash flows for the nine months ended September 30, 1995 and 1996
and the period from inception (November 29, 1988) to September 30, 1996, are
unaudited and, in the opinion of management, include all adjustments (consisting
only of normal recurring adjustments) necessary for a fair presentation. The
results of operations for the nine months ended September 30, 1996 are not
necessarily indicative of the results to be expected for the entire year.

     Cash and Cash Equivalents

     The Company considers all investments with original maturities of three
months or less to be cash equivalents. Cash equivalents consist of money market
accounts and short-term investments.

     Property and Equipment

     Property and Equipment are recorded at historical cost. Depreciation on
laboratory equipment and furniture, fixtures and other equipment is determined
using the straight-line method over the estimated useful lives of the related
assets, ranging from 3 to 5 years. Leasehold improvements are amortized using
the straight-line method over the shorter of the asset life or the remaining
life of the lease. Expenditures for maintenance and repairs are charged to
expense; betterments are capitalized.

     Capital Lease Obligations

     Assets and liabilities relating to capital leases are recorded at the
present value of the future minimum rental payments using interest rates
appropriate at the inception of the lease.

                                     F-10 
<PAGE> 

                              EPIX MEDICAL, INC. 
                     (A Company in the Development Stage) 
                  NOTES TO FINANCIAL STATEMENTS--(Continued) 

2. SIGNIFICANT ACCOUNTING POLICIES (Continued) 

   
     Income Taxes

     The Company provides for income taxes under Statement of Financial
Accounting Standards No. 109, "Accounting for Income Taxes." Under this method,
deferred taxes are recognized using the liability method, whereby tax rates are
applied to cumulative temporary differences between carrying amounts of assets
and liabilities for financial reporting purposes and the amounts used for income
tax purposes based on when and how they are expected to affect the tax return. A
valuation allowance is provided to the extent that there is uncertainty as to
the Company's ability to generate taxable income in the future to realize the
benefit from its net deferred tax asset.
    

   
     Fair Value of Financial Instruments

     In 1995 the Company adopted SFAS No. 107, "Disclosures about the Fair Value
of Financial Instruments," which requires the disclosure of the fair value of
financial instruments. At December 31, 1995, the Company's financial instruments
consist of cash, cash equivalents, notes receivable from a related party,
accounts payable and accrued expenses, capital lease obligations, promissory
notes payable and mandatorily redeemable preferred stock. Fair value of issued
equity instruments is based upon negotiated prices and includes cash and the
fair value of other consideration received.
    

   
     Mandatorily Redeemable Preferred Stock

     Mandatorily redeemable preferred stock is recorded upon issuance at fair
value, net of issuance costs, and periodically accreted to redemption value
using the interest method.
    

     Revenue Recognition

     Revenues from nonrefundable license fees are recognized upon execution of
the underlying license agreement. Option, license and milestone payments under
collaborative agreements are recorded as earned based upon the provisions of
each agreement. Payments received for which revenue has not been earned are
recorded as deferred revenue.

     Technology, Licenses and Patents

     Costs associated with technology, licenses and patents are expensed as
incurred.

     Stock-Based Compensation

     The Company has elected to follow Accounting Principles Board Opinion No.
25 "Accounting for Stock Issued to Employees" (APB 25) in accounting for its
stock-based compensation plans, rather than the alternative fair value
accounting method provided for under Statement of Financial Accounting Standards
No. 123, "Accounting for Stock- Based Compensation." Under APB 25, when the
exercise price of options granted under these plans equals the market price of
the underlying stock on the date of grant, no compensation expense is required.

     Pro Forma Net Income (Loss) Per Share (Unaudited)

     Pro forma net income (loss) per share is computed using the
weighted-average number of outstanding shares of Common Stock and Common Stock
equivalents, assuming conversion of Series A Convertible Preferred Stock
("Series A Preferred Stock"), Series B Redeemable Convertible Preferred Stock
("Series B Preferred Stock"), Series C Redeemable Convertible Preferred Stock
("Series C Preferred Stock"), Series D Redeemable Convertible Preferred Stock
("Series D Preferred Stock") and Series E Redeemable Convertible Preferred Stock
("Series E Preferred Stock") into Common Stock (as of their original date of
issuance), which will occur upon completion of the Company's proposed initial
public offering. Common Stock equivalents are excluded from the pro forma net
income (loss) per share computation when their effect is anti-dilutive; however,
pursuant to the requirements of the Securities and Exchange Commission, Common
Stock equivalent shares relating to stock

                                     F-11 
<PAGE> 

                              EPIX MEDICAL, INC. 
                     (A Company in the Development Stage) 
                  NOTES TO FINANCIAL STATEMENTS--(Continued) 

2. SIGNIFICANT ACCOUNTING POLICIES (Continued) 

options and warrants (using the treasury stock method and an assumed initial 
public offering price) and Convertible Preferred Stock issued during the 
twelve-month period prior to the initial public offering are included for all 
periods presented whether or not they are anti-dilutive. Historical earnings 
per share have not been presented because such amounts are not considered 
meaningful due to the significant change in the Company's capital structure 
that will occur in connection with the Company's proposed initial public 
offering. 

   
     Accounting Pronouncement

     In March 1995, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 121, "Accounting for Impairment of Long-Lived
Assets and for Long-Lived Assets to be Disposed Of," which establishes criteria
for the recognition and measurement of impairment loss associated with
long-lived assets. The Company has adopted this standard in 1996, and its
adoption did not have a material impact on the Company's financial position or
results of operations.
    

   
3. PROPERTY AND EQUIPMENT 
    

     Property and equipment consist of the following:

<TABLE>
<CAPTION>
                                                      March 31    December 31 
                                                        1995          1995 
                                                    ------------  ------------- 
<S>                                                 <C>           <C>
Laboratory equipment                                 $  918,466    $1,163,370 
Leasehold improvements                                  417,955       462,099 
Furniture, fixtures and other equipment                 157,068       215,869 
                                                      ---------     --------- 
                                                      1,493,489     1,841,338 
Less accumulated depreciation and amortization          602,675       984,426 
                                                      ---------     --------- 
                                                     $  890,814    $  856,912 
                                                      =========     ========= 
</TABLE>

4. LEASES 

     Under a $1.4 million lease line, the Company has entered into a number of
capital leases for equipment, including sale and leaseback transactions
involving certain equipment. Assets under capital leases, the majority of which
are laboratory equipment, totaled $800,737 and $1,320,994 at March 31, 1995 and
December 31, 1995, respectively. Accumulated amortization relating to assets
under capital leases was $383,809 and $661,257 at March 31, 1995 and December
31, 1995 respectively.

     Additionally, the Company leases office space under operating lease
arrangements. The initial term of the lease expires in December 1997 and is
renewable with 12 months notice for an additional five year term.

     Future minimum commitments under leases with non-cancelable terms of one or
more years are as follows at December 31, 1995:

<TABLE>
<CAPTION>
                                           Capital    Operating 
                                            Leases      Leases 
                                         ----------- ----------- 
<S>                                      <C>         <C>
1996                                       $381,280    $110,000 
1997                                        228,096     120,000 
1998                                        160,591 
                                           --------    -------- 
Total minimum lease payments                769,967    $230,000 
                                                       ======== 
Less amounts representing interest          123,295 
                                           -------- 
Present value minimum lease payments        646,672 
Less amounts due within one year            304,416 
                                           -------- 
                                           $342,256 
                                           ======== 
</TABLE>

     Rent expense amounted to approximately $79,819, $94,600 and $86,100 for the
twelve months ended March 31, 1994, March 31, 1995, and for the nine months
ended December 31, 1995 respectively, and approximately $312,500 for the period
from inception (November 29, 1988) to December 31, 1995.

                                     F-12 
<PAGE> 

                              EPIX MEDICAL, INC. 
                     (A Company in the Development Stage) 
                  NOTES TO FINANCIAL STATEMENTS--(Continued) 

5. ACCOUNTS PAYABLE AND ACCRUED EXPENSES 

     Included in accounts payable and accrued expenses were the following items
at March 31, 1995 and December 31, 1995:
<TABLE>
<CAPTION>
                                                  March 31,   December 31, 
                                                    1995          1995 
                                                 -----------  -------------- 
<S>                                              <C>          <C>
Accounts payable                                  $147,623     $  615,174 
Accrued development costs                                         435,562 
Accrued interest                                                   99,616 
Accrued licensing expense                           72,707         27,972 
Accrued payroll                                     86,601         15,990 
Accrued professional fees                           32,173 
Other accrued expenses                              33,079         49,887 
                                                  ---------     --------- 
Total accounts payable and accrued expenses       $372,183     $1,244,201 
                                                  =========     ========= 
</TABLE>

6. PROMISSORY NOTES 

     In May 1995, the Company issued Promissory Notes ("Promissory Notes") in an
aggregate amount of $1,500,000, which approximates fair value. The Promissory
Notes bear interest at the rate of 10% per year and become due upon demand on or
after February 15, 1996. The Promissory Notes and accrued interest thereon are
convertible, at any time after the date of issuance, into shares of the Series C
Preferred Stock, at an initial conversion price of $4.54 per share. The initial
conversion price per share shall be subject to adjustment from time to time as
provided in the agreement. In November and December 1995, the Company issued a
series of additional Promissory Notes aggregating $1,200,000 with the same terms
of interest and repayment. It is contemplated that the Convertible Notes (see
Note 14) for which the Promissory Notes may subsequently be exchanged will be
converted concurrent with a Series D Preferred Stock equity financing during
1996. Accordingly, all the Promissory Notes have been classified as long-term at
December 31, 1995.

7. CAPITAL STOCK 

     Shares of Series A Preferred Stock and Series B Preferred Stock are
convertible into shares of Common Stock by dividing $11.21 by the Series A
Preferred Stock conversion price in effect at the time of conversion and, in the
case of the Series B Preferred Stock, by dividing $1.51 by the Series B
Preferred Stock conversion price in effect at the time of conversion. The
conversion price for Series A and Series B Preferred Stock is subject to
adjustment from time to time based upon terms identified in the respective
agreements. The Company has reserved 320,730 and 1,762,484 shares of Common
Stock for issuance upon conversion of the Series A and Series B Preferred Stock,
respectively, at December 31, 1995.

   
     The stockholders of Series A and Series B Preferred Stock are entitled to
have voting rights equal to the number of Common Stocks into which the Preferred
Stocks may be converted at such time and shall be entitled to elect two
directors of the Company. Upon liquidation, the holders of Series B Preferred
Stock are also entitled to a cumulative liquidating cash dividend of 18% per
annum, compounded annually from the date of issuance, plus any other declared
but unpaid dividends thereon. In the event of liquidation, the holders of Series
A and Series B Preferred Stock are entitled to be paid an amount equal to $11.21
per share plus all declared and unpaid dividends in the case of Series A
Preferred Stock and $1.51 per share plus unpaid cumulative dividends and any
other declared but unpaid dividends thereon in the case of Series B Preferred
Stock, subject to adjustment, in the event of any stock dividends, stock split,
combination or other similar recapitalization affecting such shares. As of
December 31, 1995, aggregate cumulative unpaid dividends on Series B Preferred
Stock is $1,496,364 ($0.85 per share). At any time on or after February 1, 2000,
the holders of 67% or more of the then outstanding shares of Series B Preferred
Stock are entitled to require the Company to redeem shares of Series B Preferred
Stock then held by such stockholders. Upon exercise of the redemption right by
the Series B stockholders, the Company is required to pay such Series B
stockholders an amount equal to $1.51 per share, subject to adjustments from
time to time as identified in the agreement, plus all accrued but unpaid
dividends.
    


                                     F-13 
<PAGE> 

                              EPIX MEDICAL, INC. 
                     (A Company in the Development Stage) 
                  NOTES TO FINANCIAL STATEMENTS--(Continued) 

8. WARRANTS 

     In connection with a master line of leasing (see Note 5) the Company has
issued two warrants to purchase shares of the Company's Series A Preferred Stock
at an exercise price of $11.21 per share, subject to adjustment. The Company has
reserved 10,697 shares of Series A Preferred Stock and 36,618 shares of Common
Stock for issuance upon exercise of the warrants and subsequent conversion by
the Warrant Holders of Series A Preferred Stock into Common Stock. Warrants for
the purchase of 9,365 and 1,332 shares of the Company's Series A Preferred Stock
remain outstanding as of December 31, 1995 and expire the earlier of five years
from the date of an initial public offering or on December 21, 2002 and August
5, 2002, respectively.

     During the year ended March 31, 1995, and in connection with the master
lease line, the Company issued a warrant to purchase shares of the Company's
Series B Preferred Stock ("Series B Warrants") at an exercise price of $1.51 per
share, subject to adjustment. The Company has reserved 11,402 shares of the
Company's Series B Preferred Stock and 7,601 shares of Common Stock for issuance
upon exercise of the warrants and subsequent conversion by the Warrant Holders
of Series B Preferred Stock into Common Stock. Warrants to purchase 11,402
shares of the Company's Series B Preferred Stock remain outstanding as of
December 31, 1995 and expire on the earlier of five years from the date of an
initial public offering or June 6, 2004.

     During the nine months ended December 31, 1995, in connection with the
master lease line, the Company issued a warrant to purchase shares of the
Company's Series C Preferred Stock at an exercise price of $4.54 per share,
subject to adjustment. The Company has reserved 13,218 shares of the Company's
Series C Stock and 8,812 shares of Common Stock for issuance upon exercise of
the warrants and subsequent conversion by the Warrant Holders of Series C
Preferred Stock into Common Stock. Warrants to purchase 13,218 shares of the
Company's Series C Preferred Stock remain outstanding as of December 31, 1995
and expire on the earlier of five years from the date of an initial public
offering or August 2, 2005.

     The value ascribed to the warrants aggregating $79,019 has been accounted
for as additional paid in capital.

9. 1992 EQUITY INCENTIVE PLAN 

     On July 1, 1992, the Company adopted the 1992 Equity Incentive Plan (the
"Equity Plan"), which provides stock awards to purchase shares of Common Stock
to be granted to employees and consultants under incentive and nonstatutory
stock option agreements. Under the Plan, the exercise price for stock options
shall not be less than fair market value of the optioned stock at the date of
grant. The options are exercisable over a period determined by the Board of
Directors, but not longer than ten years after the date they are granted. Stock
option information is as follows:

<TABLE>
<CAPTION>
                                     Options       Option price    Available for 
                                   Outstanding   range per share       Grant        Exercisable 
                                  -------------- ---------------- ---------------  -------------- 
<S>                               <C>            <C>              <C>              <C>
March 31, 1993                        107,976         $0.42           725,259           6,975 
                                                                      ========        ======== 
 Granted                              142,648         $0.42 
                                     -------- 
March 31, 1994                        250,624         $0.42           582,611          34,592 
                                                                      ========        ======== 
 Granted                              359,131         $0.45 
 Exercised                            (66,866)        $0.42 
 Canceled                              (1,400)        $0.42 
                                     -------- 
March 31, 1995                        541,489      $0.42 - $0.45      224,880         143,207 
                                                                      ========        ======== 
 Granted                              133,993      $0.45 - $0.83 
 Exercised                            (38,399)     $0.42 - $0.45 
 Canceled                             (40,933)     $0.42 - $0.45 
                                     -------- 
December 31, 1995                     596,150      $0.42 - $0.83      131,820         200,631 
                                                                      ========        ======== 
 Granted (unaudited)                  738,898      $0.83 - $6.75 
 Exercised (unaudited)                (42,531)     $0.42 - $0.83 
                                     -------- 
September 30, 1996 (unaudited)      1,292,517      $0.42 - $6.75      159,563         329,330 
                                     ========                         ========        ======== 
</TABLE>

                                     F-14 
<PAGE> 

                              EPIX MEDICAL, INC. 
                     (A Company in the Development Stage) 
                  NOTES TO FINANCIAL STATEMENTS--(Continued) 

10. INCOME TAXES 

     The Company has incurred losses since inception and, due to the degree of
uncertainty related to the ultimate use of the loss carryforwards, fully
reserved this tax benefit. The Company has the following total deferred tax
assets as of March 31, 1995 and December 31, 1995:

<TABLE>
   
<CAPTION>
                                                    March 31,     December 31, 
                                                       1995           1995 
                                                  --------------  -------------- 
<S>                                               <C>             <C>
Deferred tax assets: 
 Net operating loss carryforwards                  $ 1,273,000     $ 3,137,000 
 Research and development tax credits                  100,000         300,000 
 Book over tax depreciation and amortization            79,800         113,400 
 Other                                                  18,800           9,900 
                                                     ---------      --------- 
Total deferred tax assets                            1,471,600       3,560,300 
Valuation allowances                                (1,471,600)     (3,560,300) 
                                                     ---------      --------- 
Deferred income taxes, net                         $       -0-     $       -0- 
                                                     =========      ========= 
</TABLE>
    

   
     As of December 31, 1995, the Company has net operating loss carryforwards
for income tax purposes of approximately $7.8 million, which expire through the
year 2010. The valuation allowance increased by $200,483, $1,212,900 and
$2,088,700 in the twelve months ended March 31, 1994 and March 31, 1995 and the
nine months ended December 31, 1995 respectively, due primarily to the
additional allowance for the net operating losses incurred in the respective
periods. The tax net operating loss carryforwards differ from the accumulated
deficit principally due to temporary differences in the recognition of certain
revenue and expense items for financial and tax reporting purposes.
    


11. DEFINED CONTRIBUTION PLAN 

     During the year ended March 31, 1995, the Company began a defined
contribution 401(k) plan which covers substantially all employees. The plan
permits participants to make contributions from 1% to 15% of their compensation
(as defined).

12. RELATED PARTY TRANSACTION 

     In June 1995, the Company received a promissory note from a director and
executive officer of the Company in exchange for the principal amount of
$50,000. The note is due in June 2005 and bears interest at an annual rate of
7.31% (the applicable Federal Rate at issuance). The note is subject to certain
acceleration clauses and is secured by a pledge of 14,814 shares of the
Company's Common Stock held by the borrower.

13. SIGNIFICANT AGREEMENTS 

     The Company has a license agreement with Massachusetts General Hospital
("MGH") for the exclusive license of a number of patents and patent applications
on which the Company's research and development efforts are significantly based.
In exchange, the Company will remit royalties based on a specified percentage of
revenues. Under this agreement, the Company is required to pay for all patent
application costs related to the licensed technology. On July 10, 1995, the
Company issued and sold to the MGH 83,723 shares of the Company's Common Stock
for $1,256 as consideration for certain modifications to the license. The
Company expensed the difference between proceeds received and fair value at the
time of issuance, approximately $68,000.

     In March 1992, the Company entered into an Agency Agreement with Sumitomo
Corp. ("Sumitomo") to assist the Company in entering into collaboration and
licensing arrangements with other companies in Japan for the development,
manufacture, distribution and sale of the Company's future products. At that
time, the Japanese Company purchased 66,923 shares of the Company's Series A
Preferred Stock, $.01 par value, for $11.21 per share. In October 1995, Sumitomo
assigned the Agency Agreement and its shares to Summit Pharmaceutical
International Corporation ("Agent"). Under the terms of the amended Agency
Agreement,

                                     F-15 
<PAGE> 

                              EPIX MEDICAL, INC. 
                     (A Company in the Development Stage) 
                  NOTES TO FINANCIAL STATEMENTS--(Continued) 

13. SIGNIFICANT AGREEMENTS (Continued) 

which expired and was extended for one year in March 1996, the Company is 
required to pay the Agent certain commissions and fees, based on a stipulated 
percentage of amounts received by the Company as license fees milestone 
payments or capital investments. 

     Also, in March 1992, the Company entered into a $3.5 million development
and license agreement with, a Japanese manufacturer and distributor ("Japanese
Manufacturer and Distributor") of medical products. Under the terms of the
agreement, the Company received funding for research and development through the
sale of Preferred Stock and license rights to the Company's liver MRI contrast
agent product candidate. The Company will also receive royalties on future sales
of the liver contrast agent. In exchange, the Japanese Manufacturer and
Distributor received exclusive rights to develop and commercialize the product
in Japan and certain rights in other countries in the Far East (see Note 14). In
March of 1992, the Japanese Manufacturer and Distributor purchased an equity
interest in the Company in accordance with the agreement by acquiring 26,768
shares of Series A Preferred Stock for $11.21 per share. As of December 31,
1995, the Company had received an aggregate of $2.7 million in revenues (net of
withholding tax) under this agreement.

14. SUBSEQUENT EVENTS 

     In January 1996, the Company issued convertible promissory notes for an
aggregate amount of $3,015,862 ("Convertible Notes") (see Note 6) in exchange
for $300,000 of cash and cancellation of $2.7 million of previously issued
promissory notes and accrued interest thereon. The Convertible Notes bear
interest at the rate of 10% per year and become due upon demand on or after
February 15, 1996. The Convertible Notes and accrued interest thereon are
convertible, at any time after the date of issuance, into shares of the
Company's Series C Preferred Stock at an initial conversion price that will be
between $1.51 and $2.25 depending upon certain events of conversion. The initial
conversion price per share shall be subject to further adjustment.

     The stockholders of Series C Preferred Stock will be entitled to have
voting rights equal to the number of shares of Common Stock into which such
shares of Preferred Stock may be converted at such time. In the event of
liquidation, the holders of Series C Preferred Stock will be entitled to be paid
an amount equal to the price per share at which shares of Series C Preferred
Stock are initially issued plus unpaid cumulative dividends plus any other
declared but unpaid dividends thereon, subject to adjustment in the event of any
stock dividends, stock split, combination or other similar recapitalization
affecting such shares.

     Shares of Series C Preferred Stock, upon issuance, will be convertible into
Common Stock by dividing the initial price per share at which such shares are
issued by the Series C Preferred Stock conversion price in effect at the time of
conversion. The initial conversion price for Series C Preferred Stock, $2.25 per
share, is subject to adjustment. The Company has reserved 954,872 shares of
Common Stock for issuance upon conversion of the Series C Preferred Stock.

   
     In February 1996, the Company also issued convertible promissory notes for
an aggregate amount of $600,000 ("Bridge Notes") which bear interest at a rate
of 10% per year and are due upon demand. The Bridge Notes and accrued interest
thereon are convertible, at any time after the date of issuance, on an
equivalent basis into securities of the next equity financing which is expected
to be Series D Preferred Stock, with an initial conversion price of $3.00 per
share which is subject to adjustment. The Company has reserved 1,133,325 shares
of Common Stock for issuance upon conversion of the Series D Preferred Stock.
    

     In March 1996, the Company entered into marketing, development and license
agreements with Daiichi Radioisotope Laboratories Ltd., a Japanese
pharmaceutical company ("Daiichi"). The agreements cover the Company's vascular
MRI contrast agent and provide for the Company to receive a license fee of $3.0
million (net of withholding tax), milestone payments of up to $3.3 million (net
of withholding tax) and proceeds from the issuance of 868,329 shares of Series E
Preferred Stock at price of $5.76 per share. The agreements also provides for
the Company to supply product to Daiichi and to receive royalties for sales made
by Daiichi in Japan.

                                     F-16 
<PAGE> 

                              EPIX MEDICAL, INC. 
                     (A Company in the Development Stage) 
                  NOTES TO FINANCIAL STATEMENTS--(Continued) 

14. SUBSEQUENT EVENTS (Continued) 

     In April 1996, the Company received a promissory note from a director and
executive officer of the Company in exchange for the principal amount of
$50,000. The note is due in April 2006 and bears interest at an annual rate of
6.51% (the applicable Federal Rate at issuance). The note is subject to certain
acceleration clauses and is secured by a pledge of 14,814 shares of the
Company's Common Stock held by the borrower.

     In May 1996, the Convertible Notes and accrued interest thereon were
converted into 1,432,318 shares of the Series C Preferred Stock.

     In May 1996, the Company issued 1,700,002 shares of Series D Preferred
Stock, priced at $3.00 per share, in exchange for cash and the Bridge Notes and
accrued interest thereon.

     In May 1996, the Company issued warrants to purchase 40,000 shares of the
Company's Series D Preferred Stock at an exercise price of $3.00 per share,
subject to adjustment. The Company has reserved 26,665 shares of Common Stock
for issuance upon exercise of the warrants and subsequent conversion of Series D
Preferred Stock.

     The sale of the Series E Preferred Stock, was completed in two separate
closings, one in May 1996 and the other in August 1996, for a total of 868,329
shares. The Company has reserved 578,885 shares of Common Stock for issuance
upon conversion of the Series E Preferred Stock.

   
     Under the Company's Restated Certificate of Incorporation adopted in May
1996, at any time prior on or after May 29, 2001, holders of two thirds of the
then outstanding shares of the Series B, Series C, Series D and Series E
Preferred Stock may require the Company to redeem such series of preferred stock
at specified redemption prices (equal, as of September 30, 1996, to the original
purchase price of each such series) plus any declared but unpaid dividends
thereon. The consent of the holders of a majority of the outstanding shares of
Series D Preferred Stock is required to effect a redemption of any securities
prior to the redemption of Series D Preferred Stock. The holders of Series C and
Series E Preferred Stock are entitled to a $.05 per share annual dividend if,
when and as declared by the Board of Directors which must be paid prior to
payment of any other dividends.
    

     In May 1996, the Company received a promissory note from an officer of the
Company in exchange for the amount of $180,000. The note is due in May 2006 and
bears interest at an annual rate of 6.83% (the applicable Federal Rate at
issuance). The note is subject to certain acceleration clauses and is secured by
a pledge of 44,444 shares of the Company's Common Stock held by the borrower.
The Company also repurchased from the same officer of the Company, 66,666 shares
of Common Stock at a price per share of $4.05.

   
     As a result of the above noted ownership change, the Company's ability to
utilize its tax loss carryforwards and tax credits is subject to limitations as
defined in Internal Revenue Code Sections 382 and 383. The Company currently
estimates that their annual limitation on the use of tax loss carryforwards
through May 31, 1996 will be approximately $900,000. Research and development
tax credits through May 31, 1996 of approximately $300,000 cannot be utilized
until such tax loss carryforwards are fully utilized.

     In August 1996, the Company entered into a strategic collaboration
agreement with Mallinckrodt Group Inc. ("Mallinckrodt "), a U.S. pharmaceutical
company, involving research, development and marketing of MS-325 and future MRI
vascular contrast agents developed or in-licensed by either party. Under the
terms of the agreement each party is obligated to fund a portion of the
development cost of MS-325 up to a specified maximum amount. Mallinckrodt will
have the right to manufacture MS-325 and to market the product worldwide except
Japan. The Company received a $6.0 million license fee payment upon execution of
the agreement and is eligible to receive an additional $2.0 million upon the
earlier of the completion of a specified milestone or a designated date. Under
the agreement, the Company will share in future operating profits from the sale
of products covered under the agreement.

                                     F-17 
<PAGE> 
    

                              EPIX MEDICAL, INC. 
                     (A Company in the Development Stage) 
                  NOTES TO FINANCIAL STATEMENTS--(Continued) 

14. SUBSEQUENT EVENTS (Continued) 

     In November 1996, the Board of Directors of the Company authorized
management to file a registration statement with the Securities and Exchange
Commission in order to permit the Company to sell shares of its Common Stock to
the public. If the offering is consummated under terms presently anticipated,
all of the Preferred Stock issued and outstanding will automatically convert
into 4,750,296 shares of Common Stock. Immediately following such conversion,
all currently outstanding shares of Preferred Stock will be canceled, retired
and eliminated from the Company's authorized shares of capital stock and the
number of authorized shares of Preferred Stock will be decreased to 1,000,000
shares.

     In December 1996, the Company adopted the Company's 1996 Employee Stock
Purchase Plan (the "Purchase Plan") under which employees may purchase shares of
Common Stock at a discount from fair market value. There are 66,666 shares of
Common Stock reserved for issuance under the Purchase Plan. To date, no shares
of Common Stock have been issued under the Purchase Plan. The Purchase Plan is
intended to qualify as an employee stock purchase plan within the meaning of
Section 423 of the code. Rights to purchase Common Stock under the Purchase Plan
are granted at the discretion of the Compensation Committee, which determines
the frequency and duration of individual offerings under the Purchase Plan and
the dates when stock may be purchased. Eligible employees participate
voluntarily and may withdraw from any offering at any time before stock is
purchased. Participation terminates automatically upon termination of
employment. The purchase price per share of Common Stock in an offering is 85%
of the lesser of its fair market value at the beginning of the offering period
or on the applicable exercise date and may be paid through payroll deductions,
periodic lump sum payments or a combination of both. The Purchase Plan
terminates in December 2006.

     In December 1996, the Board of Directors and stockholders of the Company
adopted the Company's 1996 Director Stock Option Plan (the "Director Plan"). All
of the directors who are not employees of the Company (the "Eligible Directors")
are currently eligible to participate in the Director Plan. There are 66,666
shares of Common Stock reserved for issuance under the Director Plan. Upon the
election or reelection of an Eligible Director, such director is automatically
granted an option to purchase 6,666 shares of Common Stock (the Option). Each
Option becomes exercisable with respect to 1,333 shares on each anniversary date
of grant for a period of five years, provided that the optionee is still a
director of the Company at the opening of business such date. The Options have a
term of ten years. The exercise price for the Options is equal to the last sale
price for the Common Stock on the business day immediately preceding the date of
grant, as reported on The Nasdaq National Market. The exercise price may be paid
in cash or shares of Common Stock, or a combination of both.

   In December 1996, the Company amended the 1992 Equity Plan. The Equity 
Plan is designed to provide the Company flexibility in awarding equity 
incentives by providing for multiple types of incentives that may be awarded. 
The purpose of the Equity Plan is to attract and retain key employees of and 
consultants of the Company and to enable them to participate in the long-term 
growth of the Company. The Equity Plan provides for the grant of stock 
options (incentive and nonstatutory), stock appreciation rights, performance 
shares, restricted stock or stock units for the purchase of an aggregate of 
1,599,901 shares of Common Stock, subject to adjustment for stock-splits and 
similar capital changes. Awards under the Equity Plan can be granted to 
officers, employees and other individuals as determined by the committee of 
the Board of Directors which administers the Equity Plan. The Compensation 
Committee selects the participants and establishes the terms and conditions 
of each option or other equity right granted under the Equity Plan, including 
the exercise price, the number of shares subject to options or other equity 
rights and the time at which such options become exercisable. The exercise 
price of all "incentive stock options" within the meaning of Section 422 of 
the Internal Revenue Code of 1986, as amended (the "Code"), granted under the 
Equity Plan must be at least equal to 100% of the fair market value of the 
option shares on the date of grant. The term of any incentive stock option 
granted under the Equity Plan may not exceed ten years. 

                                     F-18 
<PAGE> 

                              EPIX MEDICAL, INC. 
                     (A Company in the Development Stage) 
                  NOTES TO FINANCIAL STATEMENTS--(Continued) 

14. SUBSEQUENT EVENTS (Continued) 

     A reverse stock split was approved by the Board of Directors in December
1996, whereby one share of Common Stock is outstanding after the split for each
1.5 shares of Common Stock outstanding prior to the split. All share and per
share amounts related to Common Stock presented in the accompanying financial
statements have been restated to reflect the reverse stock split.

     In December 1996, the Company and the Japanese Manufacturer and Distributor
agreed to restructure an existing agreement to collaborate on the development
and commercialization of a liver MRI contrast agent. In connection with the
restructuring, the parties terminated further collaboration efforts and the
Japanese Manufacturer and Distributor relinquished its exclusive rights in Japan
to the liver MRI agent in exchange for a non-exclusive technology license and a
$250,000 payment from the Company. The Company is entitled to receive royalties
based upon specified percentage of future revenues, if any, from the sale of
liver MRI contrast agents by the Japanese Manufacturer and Distributor.

                                     F-19 
<PAGE> 

                     [THIS PAGE INTENTIONALLY LEFT BLANK] 


<PAGE>
[INSIDE PANEL PAGE]



TECHNOLOGY AND RESEARCH PIPELINE
- --------------------------------------------------------------------------------

[EPIX LOGO]


MS-325 and the Next
Generation of Targeted
MRI Agents

[bullet] MS-325 was designed by EPIX 
scientists to bind to the blood 
protein albumin and provide an 
enhanced magnetic signal. 

[bullet] EPIX scientists are developing 
additional targeting and signal 
enhancement technologies to 
expand the number of diseases 
which can be detected with MRI.

[Diagram of MS-325 molecular structure]
[Diagram caption: Chemical structure of MS-325]

[Diagram of MS-325 attached to albumin]
[Diagram caption: MS-325 fitting into albumin binding site]

[Diagram of MS-325 mechanism of action]
[Diagram caption: MS-325 mechanism of action: signal enhancement upon binding
to albumin]


- --------------------------------------------------------------------------------
EPIX Products and Research Areas

In addition to developing MS-325 for vascular applications, EPIX is conducting
research in the following areas:

[bullet] MS-325 for MRI exams to diagnose tumors, including breast cancer;

[bullet] Thrombus-seeking agents for the detection of blood clots throughout 
         the body; and

[bullet] Functional brain-imaging agents to enhance the use of MRI in
         differentiating among the many neurodegenerative and psychiatric
         diseases.

[Diagram demonstrating current areas of research]

[Diagram captions: Brain Activation
                   Thrombus
                   Vascular MS-325]

- --------------------------------------------------------------------------------
MS-325 IS CURRENTLY BEING EVALUATED IN CLINICAL TRIALS AND NEITHER MS-325 NOR
OTHER CONTRAST AGENTS UNDER DEVELOPMENT HAVE RECEIVED MARKETING APPROVAL FROM
THE FDA OR ANY FOREIGN REGULATORY BODY.





<PAGE>


================================================================================
 No dealer, salesperson or other person has been authorized to give any 
information or to make any representations other than those contained in this 
Prospectus and, if given or made, such information or representations must 
not be relied upon as having been authorized by the Company or the 
Underwriters. This Prospectus does not constitute an offer to sell or a 
solicitation of an offer to buy to any person in any jurisdiction in which 
such offer or solicitation would be unlawful, or to any person to whom it is 
unlawful. Neither the delivery of this Prospectus nor any offer or sale made 
hereunder shall, under any circumstances, create any implication that there 
has been no change in the affairs of the Company or that the information 
contained herein is correct as of any time subsequent to the date hereof. 

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

                              TABLE OF CONTENTS 

<TABLE>
<CAPTION>
                                                                Page 
                                                              --------- 
<S>                                                           <C>
Prospectus Summary                                                3 
Risk Factors                                                      5 
Use of Proceeds                                                  14 
Dividend Policy                                                  14 
Capitalization                                                   15 
Dilution                                                         16 
Selected Financial Data                                          17 
Management's Discussion and 
  Analysis of Financial Condi- 
  tion and Results of Operations                                 18 
Business                                                         22 
Management                                                       40 
Certain Transactions                                             48 
Principal Stockholders                                           50 
Description of Capital Stock                                     52 
Shares Eligible for Future Sale                                  54 
Underwriting                                                     56 
Legal Matters                                                    57 
Experts                                                          57 
Additional Information                                           57 
Index to Financial Statements                                   F-1 
</TABLE>
                                ------------- 

 Until , 1997 (25 days after the date of this Prospectus), all dealers 
effecting transactions in the Common Stock, whether or not participating in 
this distribution, may be required to deliver a Prospectus. This is in 
addition to the obligations of dealers to deliver a Prospectus when acting as 
Underwriters and with respect to their unsold allotments or subscriptions. 

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



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




                               2,000,000 Shares 

                                   [LOGOTYPE]
                                  EPIX MEDICAL



                                 Common Stock 





                                 ------------- 
                                  PROSPECTUS 
                                 ------------- 





                                HAMBRECHT & QUIST




                                WESSELS, ARNOLD &
                                    HENDERSON



                                         , 1997 

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

<PAGE> 





                                   PART II 

                    INFORMATION NOT REQUIRED IN PROSPECTUS 

Item 13. Other Expenses of Issuance and Distribution 

The following are the expenses of issuance and distribution of the Common Stock
registered hereunder on Form S-1 other than underwriting discounts and
commissions:

SEC registration fee                           $  7,667 
Nasdaq listing fee                             $ 40,037 
NASD filing fee                                $  3,030 
Blue Sky fees and expenses                     $ 10,000 
Printing, engraving and mailing expenses       $120,000 
Accounting fees and expenses                   $150,000 
Legal fees and expenses                        $275,000 
Transfer Agent and Registrar fees              $  5,500 
Miscellaneous expenses                         $ 88,766 
                                               --------
  Total                                        $700,000 

Item 14. Indemnification of Directors and Officers 

   Section 145 of the Delaware General Corporation Law grants the Registrant 
the power to indemnify each person who was or is a party or is threatened to 
be made a party to any threatened, pending or completed action, suit or 
proceeding, whether civil, criminal, administrative or investigative by 
reason of the fact that he is or was a director, officer, employee or agent 
of the Registrant, or is or was serving at the request of the Registrant as a 
director, officer, employee or agent of another corporation, partnership, 
joint venture, trust or other enterprise, against expenses (including 
attorneys' fees), judgments, fines and amounts paid in settlement actually 
and reasonably incurred by him in connection with any such action, suit or 
proceeding if (i) he acted in good faith and in a manner he reasonably 
believed to be in or not opposed to the best interests of the Registrant and 
(ii) with respect to any criminal action or proceeding, he had no reasonable 
cause to believe his conduct was unlawful, provided, however, no 
indemnification shall be made in connection with any proceeding brought by or 
in the right of the Registrant where the person involved is adjudged to be 
liable to the Registrant except to the extent approved by a court. 

   Article NINTH of the Registrant's Restated Certificate of Incorporation 
provides that a director shall not be personally liable to the Registrant's 
stockholders for monetary damages for breach of fiduciary duty as a director, 
except to the extent that the eliminations or limitation of liability is not 
permitted under the Delaware General Corporation Law as in effect when such 
liability is determined. 

   Article TENTH of the Registrant's Restated Certificate of Incorporation 
provides that the Registrant shall, to the fullest extent permitted by the 
Delaware General Corporation Law, as amended from time to time, indemnify 
each person who was or is a party or is threatened to be made a party to any 
threatened, pending or completed action, suit or proceeding by reason of the 
fact that he is or was, or has agreed to become a director or officer of the 
Registrant. The indemnification provided for in Article TENTH is expressly 
not exclusive of any other rights to which those seeking indemnification may 
be entitled under any law, agreement or vote of stockholders or disinterested 
directors or otherwise, and shall inure to the benefit of the heirs, 
executors and administrators of such persons. Article TENTH further permits 
the Board of Directors to authorize the grant of indemnification rights to 
other employees and agents of the Registrant and such rights may be 
equivalent to, or greater or less than, those set forth in Article TENTH. 

   Article V, Section 1 of the Registrant's By-laws provides that the 
Registrant shall, to the full extent permitted by the Delaware General 
Corporation Law, as amended from time to time, and the Certificate of 
Incorporation, indemnify each person whom it may indemnify thereto. 

   Article V, Section 2 of the Registrant's By-Laws provides that the 
Registrant shall have the power to purchase and maintain insurance on behalf 
of any person who is or was a director, officer, employee or agent of the 

                                     II-1 
<PAGE> 

Registrant, or is or was serving at the request of the Registrant as a 
director, officer, employee or agent of another corporation, partnership, 
joint venture, trust or other enterprise against any liability asserted 
against such person and incurred by such person in any such capacity or 
arising out of such person's status as such. 

   The Registrant's Restated Certificate of Incorporation and applicable 
provisions of Delaware law provide that directors of the Registrant will not 
be personally liable to the Registrant or its stockholders for monetary 
damages for breach of fiduciary duty as a director, whether or not an 
individual continues to be a director at the time such liability is asserted, 
except for liability (i) for any breach of the director's duty of loyalty to 
the Registrant or its stockholders, (ii) for acts or omissions not in good 
faith or which involve intentional misconduct or a knowing violation of law, 
(iii) pursuant to Section 174 of the Delaware General Corporation Law or (iv) 
for any transaction from which the director derives an improper personal 
benefit. 

   The Registrant expects to enter into agreements with certain officers and 
directors affirming the Registrant's obligation to indemnify them to the 
fullest extent permitted by law and providing various other protections. 

Item 15. Recent Sales of Unregistered Securities 

   Since 1993, the Registrant has sold and issued the following unregistered 
securities: 

   In March 1994, the Registrant sold 2,643,736 shares of Series B 
Convertible Preferred Stock at a purchase price of $1.513 per share to 
Bessemer Venture Partners III L.P., Accel IV L.P. and certain related 
persons. Such shares will convert into shares of Common Stock on a 1-for-1.5 
basis upon the consummation of the Registrant's initial public offering as a 
result of a 1-for-1.5 reverse stock split effected in December 1996. 

   In June 1994, the Registrant issued to Dominion Ventures, Inc., a warrant 
to purchase 11,402 shares of the Registrant's Convertible Series B Preferred 
Stock having an exercise price per share of $1.513. This warrant will be 
exercisable for 7,601 shares of Common Stock with an exercise price of $2.27 
per share upon consummation of the Registrant's initial public offering as a 
result of a 1-for-1.5 reverse stock split effected in December 1996. 

   In May 1995, the Registrant sold to Bessemer Venture Partners III L.P., 
Accel IV L.P. and certain related persons Convertible Promissory Notes (the 
"1995 Convertible Notes") having an aggregate principal amount of $1,500,000 
and convertible, as a whole, at the holders' option, into 355,256 shares of 
the Registrant's Series C Convertible Preferred Stock at a conversion price 
of $4.54 per share. 

   In August 1995, the Registrant issued to Dominion Fund II a warrant to 
purchase 13,218 shares of the Registrant's Series C Convertible Preferred 
Stock having an exercise price per share of $4.54. This warrant will be 
exercisable for 8,812 shares of Common Stock with an exercise price of $6.81 
per share upon consummation of the Registrant's initial public offering as a 
result of a 1-for-1.5 reverse stock split effected in December 1996. 

   In November and December 1995, Accel IV L.P., Bessemer Venture Partners 
III L.P. and certain related persons made bridge loans to the Company in an 
aggregate principal amount of $1,200,000 in exchange for promissory notes 
bearing interest at a rate of 10% per annum and convertible on a 
dollar-for-dollar basis for shares of the Company's securities in the 
Company's next permanent equity financing (the "1995 Bridge Notes"). 

   In January 1996, all of the 1995 Convertible Notes were amended and 
restated to, among other things, change the conversion price to between 1.51 
and $2.25 per share, depending on certain events of conversion, and the 
Registrant issued to Bessemer Venture Partners III L.P., Accel IV L.P. and 
certain related persons Convertible Promissory Notes (the "1996 Convertible 
Notes") having an aggregate principal amount of $1,515,862 and convertible, 
as a whole, at the holder's option, into shares of the Registrants' Series C 
Convertible Preferred Stock at a conversion price between $1.51 and $2.25 per 
share, depending on certain events of conversion, in exchange for cash and 
the surrender of the 1995 Bridge Notes and accrued interest thereon. 

   In May 1996, the Registrant sold 1,700,002 shares of Series D Convertible 
Preferred Stock at a purchase price of $3.00 per share to a group of 
sophisticated investors. Such shares will convert into shares of Common Stock 
on a 1-for-1.5 basis upon the consummation of the Company's initial public 
offering as a result of a 1-for-1.5 reverse stock split effected in December 
1996. 

   In May 1996, in connection with the Registrant's sale of Series D 
Convertible Preferred Stock, the Registrant issued warrants to purchase an 
aggregate of 40,000 shares of the Registrant's Series D Preferred Stock 

                                     II-2 
<PAGE> 

having an exercise price of $3.00 per share. The warrants were issued to 
Bessemer Venture Partners III L.P., Accel IV L.P., Accel Investors '93 L.P., 
Ellmore C. Patterson Partners, Accel Keiretsu L.P. and Prosper Partners. 
These warrants will be exercisable for an aggregate of 26,665 shares of 
Common Stock with an exercise price of $4.50 per share upon consummation of 
the Registrant's initial public offering as a result of a 1-for-1.5 reverse 
stock split effected in December 1996. 

   Concurrently with the sale of Series D Convertible Preferred Stock, the 
1995 Convertible Notes and the 1996 Convertible Notes were surrendered and 
converted into an aggregate of 1,432,318 shares of Series C Convertible 
Preferred Stock at a conversion price of $2.25 per share. Such shares will 
convert into shares of Common Stock on a 1-for-1.5 basis upon the 
consummation of the Registrant's initial public offering as a result of a 
1-for-1.5 reverse stock split effected in December 1996. 

   In May 1996, the Registrant sold to Daiichi Radioisotope Laboratories, 
Ltd. 520,997 shares of the Registrant's Series E Convertible Preferred Stock 
at a purchase price of approximately $5.76 per share. Such shares will 
convert into shares of Common Stock on a 1-for-1.5 basis upon the 
consummation of the Registrant's initial public offering as a result of a 
1-for-1.5 reverse stock split effected in December 1996. 

   In August 1996, the Registrant issued to Daiichi Radioisotope 
Laboratories, Ltd. 347,332 shares of the Registrant's Series E Convertible 
Preferred Stock at a purchase price of approximately $5.76 per share. Such 
shares will convert into shares of Common Stock on a 1-for-1.5 basis upon the 
consummation of the Registrant's initial public offering as a result of a 
1-for-1.5 reverse stock split effected in December 1996. 

   
   Between June 30, 1992 and December 31, 1996, the Registrant granted 
options to purchase 1,497,644 shares of Common Stock to its employees and 
consultants under its 1992 Equity Incentive Plan having exercise prices 
ranging from $0.42 to $8.50 per share. As of December 31, 1996, options to 
purchase 172,574 shares had been exercised, options to purchase 47,267 shares 
had been cancelled and options to purchase 1,277,803 shares remained 
outstanding. 
    

   No underwriter was engaged in connection with the foregoing issuance of 
securities. The above described issuances of the Registrant's Preferred Stock 
were made in reliance upon Section 4(2) of the Securities Act of 1933, as 
amended (the "Securities Act"), as transactions not involving any public 
offering. The Company has reason to believe that all of the foregoing 
purchasers were familiar with or had access to information concerning the 
operations and financial conditions of the Company, and all of those 
individuals were acquiring the shares for investment and not with a view to 
the distribution thereof. At the time of issuance, all of the foregoing 
shares of Preferred Stock were deemed to be restricted securities for 
purposes of the Act and the certificates representing such securities bore 
legends to that effect. 

Item 16. Exhibits and Financial Statement Schedules 

   (a) Exhibits 

<TABLE>
   
<CAPTION>
<S>        <C>
1.1*       Form of Underwriting Agreement. 
3.1*       Restated Certificate of Incorporation of the Registrant. 
3.2*       Certificate of Amendment of Restated Certificate of Incorporation of Registrant. 
3.3*       Form of Restated Certificate of Incorporation of Registrant. 
3.4*       By-Laws of the Registrant, as amended. 
3.5*       Form of Amended and Restated By-Laws of Registrant. 
4.1*       Specimen certificate for shares of Common Stock of the Registrant. 
5.1*       Opinion of Palmer & Dodge LLP. 
10.1+*     Agency Agreement between the Registrant and Sumitomo Corporation dated March 13, 1992. 
10.2+*     Amendment Agreement to the Agency Agreement between the Registrant and Sumitomo Corporation dated 
             June 26, 1992. 
10.3       Short Form Lease from Trustees of the Cambridge East Trust to the Registrant dated July 1, 1992. 
             Short Form Lease previously filed except for schedules filed herewith. 
10.4*      Form of Warrant to Purchase Shares of Series A Convertible Preferred Stock dated December 21, 
             1992. 
10.5*      Dominion Ventures Master Lease Agreement No. 8050 dated December 21, 1992. 
10.6*      First Amendment to Master Lease Agreement No. 8050 dated May 14, 1993. 
    

                                     II-3 
<PAGE> 

   
10.7*      Second Amendment to Master Lease Agreement No. 8050 dated August 5, 1993. 
10.8*      First Amendment Lease From Trustees of the Cambridge Trust to the Registrant dated October 20, 
             1993. 
10.9*      Warrant to Purchase Shares of Series B Convertible Preferred Stock dated June 6, 1994. 
10.10*     Second Amendment to Master Lease Agreement No. 8050 dated June 6, 1994. 
10.11+*    Amendment Agreement to the Agency Agreement between the Registrant and Sumitomo Corporation dated 
             September 15, 1994. 
10.12*     Second Amendment Lease From Trustees of the Cambridge East Trust to the Registrant dated 
             September 17, 1994. 
10.13*     Convertible Promissory Note Purchase Agreement by and among the Registrant and certain purchasers 
             named therein dated May 26, 1995. 
10.14+*    Amended and Restated License Agreement between the Registrant and The General Hospital 
             Corporation dated July 10, 1995. 
10.15*     Warrant to Purchase Shares of Series C Convertible Preferred Stock dated August 2, 1995. 
10.16*     Third Amendment to the Master Lease Agreement No. 8050 dated August 2, 1995. 
10.17*     Amendment No. 1 to Convertible Promissory Note Purchase Agreement by and among the Registrant and 
             certain purchasers named therein dated January 19, 1996. 
10.18+*    Extension Agreement to Agency Agreement between the Registrant and Sumitomo Corporation dated 
             March 5, 1996. 
10.19+*    Development and License Agreement dated March 29, 1996 by and among the Registrant and Daiichi 
             Radioisotope Laboratories, Ltd. 
10.20*     Third Amendment Lease From Trustees of the Cambridge East Trust to the Registrant dated May 1, 
             1996. 
10.21*     Series D Convertible Preferred Stock Purchase Agreement by and among the Registrant and certain 
             purchasers named therein dated May 29, 1996. 
10.22*     Third Amended and Restated Stockholders' Rights Agreement by and among the Registrant and certain 
             of its stockholders named therein dated May 29, 1996. 
10.23*     Form of Warrant to Purchase Shares of Series D Preferred Stock dated May 29, 1996. 
10.24*     Amendment No. 1 to Third Amended and Restated Stockholders' Rights Agreement dated May 31, 1996. 
10.25*     Series E Convertible Preferred Stock Purchase Agreement dated May 31, 1996 between the Registrant 
             and Daiichi Radioisotope Laboratories, Ltd. 
10.26+*    Strategic Collaboration Agreement between the Registrant and Mallinckrodt Medical, Inc. and 
             Mallinckrodt Group Inc. dated August 30, 1996. 
10.27*     Amendment No. 2 to Third Amended and Restated Stockholders' Rights Agreement dated December 6, 
             1996. 
10.28*     Amended and Restated 1992 Equity Incentive Plan. 
10.29*     Form of Incentive Stock Option Certificate. 
10.30*     Form of Nonstatutory Stock Option Certificate. 
10.31*     1996 Director Stock Option Plan. 
10.32*     1996 Employee Stock Purchase Plan. 
10.33*     Form of Consulting and Confidentiality Agreement between the Registrant and certain consultants 
             of the Registrant. 
10.34*     Form of Invention and Non-disclosure Agreement between the Registrant and certain employees of 
             the Registrant. 
10.35*     Form of Non-Competition and Non-Solicitation Agreement between the Registrant and certain 
             employees of the Registrant. 
10.36*     Form of Common Stock Purchase Agreement. 
10.37*     Form of Stock Purchase and Right of First Refusal Agreement. 
23.1*      Consent of Palmer & Dodge LLP (included in Exhibit 5.1). 
23.2       Consent of Ernst & Young LLP. Filed herewith. 
24.1*      Power of Attorney. 
24.2*      Certified resolutions of the Registrant authorizing power of attorney. 
27.1*      Financial Data Schedule. 
</TABLE>
    

                                     II-4 
<PAGE> 

- ------------- 
+ Certain confidential material contained in the document has been omitted 
  and filed separately with the Securities and Exchange Commission pursuant 
  to Rule 406 of the Securities Act. 

   
* Previously filed. 
    

   (b) Financial Statement Schedules 

   All schedules are omitted because they are not applicable or the required 
information is shown in the financial statements or notes thereto. 

Item 17. Undertakings 

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

   (b) The undersigned Registrant hereby undertakes to provide to the 
underwriters at the closing specified in the underwriting agreement 
certificates in such denominations and registered in such names as required 
by the underwriters to permit prompt delivery to each purchaser. 

   (c) The undersigned Registrant hereby undertakes that: 

     (1) For purposes of determining any liability under the Securities Act, 
the information omitted from the form of prospectus filed as part of this 
registration statement in reliance upon Rule 430A and contained in a form of 
prospectus filed by the registrant pursuant to Rule 424(b)(1) or (4) or 
497(h) under the Securities Act shall be deemed to be a part of this 
registration statement as of the time it was declared effective. 

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

                                     II-5 
<PAGE> 

                                  SIGNATURES 

   
   Pursuant to the requirements of the Securities Act of 1933, the Registrant 
has duly caused this Amendment No. 1 to the Registration Statement to be 
signed on its behalf by the undersigned, thereunto duly authorized, in the 
City of Cambridge, State of Massachusetts, on January 17, 1997. 
    

   
                                   EPIX MEDICAL, INC. 

                                   By: /s/ Michael D. Webb 
                                       ----------------------------------------
                                           Michael D. Webb 
                                           President and Chief Executive Officer
    

   
Pursuant to the requirements of the Securities Act of 1933, this Amendment 
No. 1 to the Registration Statement has been signed by the following persons 
in the capacities and on the dates indicated. 
    

<TABLE>
   
<CAPTION>
          Signature                               Title                             Date 
          ---------                               -----                             ---- 
<S>                                <C>                                       <C>
/s/ Michael D. Webb                  President, Chief Executive Officer 
- --------------------------------     and Director (Principal Executive 
    Michael D. Webb                  Officer)                                   January 17, 1997 
    

    Jeffrey R. Lentz*                Chief Financial Officer, and Vice 
- --------------------------------     President, Finance and 
    Jeffrey R. Lentz                 Administration (Principal Financial 
                                     Officer and Principal Accounting 
                                     Officer)                                   January 17, 1997 

    Christopher F. O. Gabrieli* 
- --------------------------------     Director and Chairman of the Board         January 17, 1997 
    Christopher F. O. Gabrieli           


    Stanley T. Crooke, M.D., Ph.D.*  Director                                   January 17, 1997 
- -------------------------------- 
    Stanley T. Crooke, M.D., Ph.D.  


    Luke B. Evnin, Ph.D.*            Director                                   January 17, 1997 
- ----------------------------------
    Luke B. Evnin, Ph.D.              


    Randall B. Lauffer, Ph.D.*       Director                                   January 17, 1997 
- -----------------------------------
    Randall B. Lauffer, Ph.D.          


*By /s/ Michael D. Webb 
   --------------------------------
        Michael D. Webb 
        Attorney-in-Fact 
</TABLE>

                                     II-6 
<PAGE> 

                                EXHIBIT INDEX 

<TABLE>
   
<CAPTION>
 Exhibit 
 Number                                            Description                                            Page 
 --------   -----------------------------------------------------------------------------------------     ------ 
<S>         <C>                                                                                           <C>
1.1*        Form of Underwriting Agreement. 
3.1*        Restated Certificate of Incorporation of the Registrant. 
3.2*        Certificate of Amendment of Restated Certificate of Incorporation of Registrant. 
3.3*        Form of Restated Certificate of Incorporation of Registrant. 
3.4*        By-Laws of the Registrant, as amended. 
3.5*        Form of Amended and Restated By-Laws of Registrant. 
4.1*        Specimen certificate for shares of Common Stock of the Registrant. 
5.1*        Opinion of Palmer & Dodge LLP. 
10.1+*      Agency Agreement between the Registrant and Sumitomo Corporation dated March 13, 1992. 
10.2*       Amendment to the Agency Agreement between the Registrant and Sumitomo Corporation dated 
              June 26, 1992. 
10.3        Short Form Lease from Trustees of the Cambridge East Trust to the Registrant dated July 
              1, 1992. Short Form Lease previously filed except for schedules filed herewith. 
10.4*       Form of Warrant to Purchase Shares of Series A Convertible Preferred Stock dated December 
              21, 1992. 
10.5*       Dominion Ventures Master Lease Agreement No. 8050 dated December 21, 1992. 
10.6*       First Amendment to Master Lease Agreement No. 8050 dated May 14, 1993. 
10.7*       Second Amendment to Master Lease Agreement No. 8050 dated August 5, 1993. 
10.8*       First Amendment Lease From Trustees of the Cambridge Trust to the Registrant dated 
              October 20, 1993. 
10.9*       Warrant to Purchase Shares of Series B Convertible Preferred Stock dated June 6, 1994. 
10.10*      Second Amendment to Master Lease Agreement No. 8050 dated June 6, 1994. 
10.11+*     Amendment Agreement to the Agency Agreement between the Registrant and Sumitomo 
              Corporation dated September 15, 1994. 
10.12*      Second Amendment Lease From Trustees of the Cambridge East Trust to the Registrant dated 
              September 17, 1994. 
10.13*      Convertible Promissory Note Purchase Agreement by and among the Registrant and certain 
              purchasers named therein dated May 26, 1995. 
10.14+*     Amended and Restated License Agreement between the Registrant and The General Hospital 
              Corporation dated July 10, 1995. 
10.15*      Warrant to Purchase Shares of Series C Convertible Preferred Stock dated August 2, 1995. 
10.16*      Third Amendment to the Master Lease Agreement No. 8050 dated August 2, 1995. 
10.17*      Amendment No. 1 to Convertible Promissory Note Purchase Agreement by and among the 
              Registrant and certain purchasers named therein dated January 19, 1996. 
10.18+*     Extension Agreement to Agency Agreement between the Registrant and Sumitomo Corporation 
              dated March 5, 1996. 
10.19+*     Development and License Agreement dated March 29, 1996 by and among the Registrant and 
              Daiichi Radioisotope Laboratories, Ltd. 
10.20*      Third Amendment Lease From Trustees of the Cambridge East Trust to the Registrant dated 
              May 1, 1996. 
10.21*      Series D Convertible Preferred Stock Purchase Agreement by and among the Registrant and 
              certain purchasers named therein dated May 29, 1996. 
10.22*      Third Amended and Restated Stockholders' Rights Agreement by and among the Registrant and 
              certain of its stockholders named therein dated May 29, 1996. 
10.23*      Form of Warrant to Purchase Shares of Series D Preferred Stock dated May 29, 1996. 
10.24*      Amendment No. 1 to Third Amended and Restated Stockholders' Rights Agreement dated May 
              31, 1996. 
    

<PAGE> 

   
 Exhibit 
 Number                                            Description                                            Page 
 --------   -----------------------------------------------------------------------------------------     ------ 
10.25*      Series E Convertible Preferred Stock Purchase Agreement dated May 31, 1996 between the 
              Registrant and Daiichi Radioisotope Laboratories, Ltd. 
10.26+*     Strategic Collaboration Agreement between the Registrant and Mallinckrodt Medical, Inc. 
              and Mallinckrodt Group Inc. dated August 30, 1996. 
10.27*      Amendment No. 2 to Third Amended and Restated Stockholders' Rights Agreement dated 
              December 6, 1996. 
10.28*      Amended and Restated 1992 Equity Incentive Plan. 
10.29*      Form of Incentive Stock Option Certificate. 
10.30*      Form of Nonstatutory Stock Option Certificate. 
10.31*      1996 Director Stock Option Plan. 
10.32*      1996 Employee Stock Purchase Plan. 
10.33*      Form of Consulting and Confidentiality Agreement between the Registrant and certain 
              consultants of the Registrant. 
10.34*      Form of Invention and Non-disclosure Agreement between the Registrant and certain 
              employees of the Registrant. 
10.35*      Form of Non-Competition and Non-Solicitation Agreement between the Registrant and certain 
              employees of the Registrant. 
10.36*      Form of Common Stock Purchase Agreement. 
10.37*      Form of Stock Purchase and Right of First Refusal Agreement. 
23.1*       Consent of Palmer & Dodge LLP (included in Exhibit 5.1). 
23.2        Consent of Ernst & Young LLP. Filed herewith. 
24.1*       Power of Attorney. 
24.2*       Certified resolutions of the Registrant authorizing power of attorney. 
27.1*       Financial Data Schedule. 
</TABLE>
    

- ------------- 
+ Certain confidential material contained in the document has been omitted 
  and filed separately with the Securities and Exchange Commission pursuant 
  to Rule 406 of the Securities Act. 


   
* Previously filed. 
    







                               EQUIPMENT SCHEDULE
                                       1-A

                   to Master Lease Agreement Number 8050 Dated
                                December 21, 1992

LESSOR:        Dominion Ventures, Inc.   LESSEE:  Metasyn, Inc.
               44 Montgomery Street               71 Rogers Street
               Suite 4200                         Cambridge, MA  02142
               San Francisco, CA   94104

All terms and conditions of the above referenced Master Lease Agreement are
hereby expressly incorporated into this Equipment Schedule and made a part
hereof as if such terms and conditions were fully set forth herein. By their
execution of the Equipment Schedule the parties reaffirm all terms and
conditions of the Master Lease Agreement except as they may be modified hereby.
This Equipment Schedule shall become effective upon execution on date same is
executed by Lessor.

TOTAL EQUIPMENT COST OF THIS SCHEDULE:  $142,142.84

FUNDING EXPIRATION DATE:  May 31, 1993

RENTAL AMOUNT:  $4,719.14

INITIAL TERM:   36 Months

FREQUENCY:  Monthly in Advance

EQUIPMENT DESCRIPTION:  See Exhibit A Attached Hereto

ADVANCE RENTAL APPLIED:  Last Month's

COMMENCEMENT DATE:  July 1, 1993

SECURITY DEPOSIT:  $0.00

EQUIPMENT LOCATION:                          LESSEE CONTACT:

Metasyn, Inc.                                Name:  Margot MacArthur
71 Rogers Street                             Phone: 617-876-5920
Cambridge, MA  02142

IN WITNESS WHEREOF,

DOMINION VENTURES, INC.                      METASYN, INC.


By:  /s/                                     By: /s/ Randall B. Lauffer
    ------------------------------              ------------------------------
Its:  Res                                    Its: CEO
    ------------------------------              ------------------------------

Date: 4/30/93
     ----------------------------

<PAGE>


Metasyn, Inc.
Schedule A, Exhibit A
Sale / Leaseback
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------------------------
                                                                                               Months
      Serial No./                                                          Unit        Total    Old       DVI            DVI 
Qty   Model No.              Description                                   Cost        Cost    4/5/93  Percentage     Valuation
- ----------------------------------------------------------------------------------------------------------------------------------
<S>   <C>                    <C>                                        <C>          <C>        <C>      <C>          <C>

Vendor:  Harvard University, Technology Product Center, 65 Rear Mt. Auburn Street, Cambridge, MA 02138
   4/22/92; PO #60-00014
 1   s/n:  CK2101614         Apple Mac IIsi 5/80 MO364LB                 $2,296.00   $2,296.00   11      65%          $1,492.40
 4   m/n:  CTSM084M          CP MEM 4M Mac IIci CPS                        $660.00     $660.00   11      65%            $429.00
                             M08AL480,installed                                                          
 1   s/n:  7035376           apple Monitor, Color M0401LL/B                $696.00     $696.00   11      65%            $452.40
 1                           Apple Keyboard Extended SEII                  $159.00     $159.00   11      65%            $103.35
 1   s/n:  CA049L8W          Apple PLW NT                                $1,274.00   $1,274.00   11      65%            $828.10
                                                                                                                      ---------
                                                                                                      Subtotal        $3,305.25
Vendor:  Tech Computer Centers, 199 Alewife Brook Parkway, Cambridge, MA 02138                                   
   5/18/92;  INV. # 030996                                                                                       
 1   s/n:  FC2156MMC53       Mac IIsi 5/80 (M0364LL/A)                   $2,499.00   $2,499.00   11      65%          $1,642.35
 4                           2mb Simms installed                            $97.25     $389.00   11      65%            $252.85
 1                           Apple Extended Keyboard (M0312)               $165.00     $165.00   11      65%            $107.25
 1   s/n:  7091898           15" Portrait Display Monitor (M0404)          $789.00     $789.00   11      65%            $512.85
 1   s/n:  CA1484E3          Laserwriter IIf (B0627LL/A)                 $2,999.00   $2,999.00   11      65%          $1,949.35
                                                                                                                      ---------
                                                                                                      Subtotal        $4,446.65
Vendor:  CompuCom Systems, 1228 Forest Parkway, West Depford, NJ  08066                                          
   5/22/92;  Inv.  80030716                                                                                      
 1   m/n:  APP3012           Apple SE, Mac II Extended Keyboard            $151.00     $151.00   10      65%             $98.15
 1   s/n:  7064320M040ILL    Apple Hi-Res RGB Monitor (Mac II)             $650.00     $650.00   10      65%            $422.50
 1   m/n:  KTCKTM8000/SI     8MB Memory Module F/Mac IIsi                  $372.00     $372.00   10      65%            $241.80
 1   s/n:  FC21579V153       Mac IIsi 5MB CPU HD80                       $2,266.00   $2,266.00   10      65%          $1,472.90
 1   s/n:  05-26052          Star Controller w/ Commun. SFW                $960.00     $960.00   10      65%            $624.00
                                                                                                                      ---------
                                                                                                      Subtotal        $2,859.35
Vendor:  business Interiors, 529 Main Street, Boston, MA  02129                                                  
   7/31/92;  Inv. 64130                                                                                          
     STEELCASE                                                                                       
 1   m/n:  MD6636LCRP         RBL Desk                                      $740.00     $740.00    8      70%           $518.28
 1   m/n:  MD4824LLP          RBL Return                                    $465.00     $465.00    8      70%           $325.50
 1   m/n:  PWR7230XX          RBL Worksurface                               $250.80     $250.80    8      70%           $175.56
 1   m/n:  99111MH            RBL Mobile Pedestal File, 1 box/1 file        $366.00     $366.00    8      70%           $256.20
 1   m/n:  853600             RBL Round Table                               $228.60     $228.60    8      70%           $160.02
 1   m/n:  4571214            RBL Rolly Rneumatic Chair                     $446.00     $446.00    8      70%           $312.48
</TABLE>


                                     Page 1
<PAGE>

Metasyn, Inc.
Schedule A, Exhibit A
Sale / Leaseback
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------------------------
                                                                                               Months
      Serial No./                                                          Unit        Total    Old       DVI         DVI 
Qty   Model No.              Description                                   Cost        Cost    4/5/93  Percentage   Valuation
- ----------------------------------------------------------------------------------------------------------------------------------
<S>   <C>                    <C>                                            <C>       <C>           <C>   <C>      <C>
 3    m/n:  421482NM         RBL Side Sled Chair                            $228.60     $685.80     8     70%        $480.06
 1    m/n:  TQ1207T36        RBL 36x12x80 Bookcase                          $200.00     $200.00     8     70%        $140.00
 1    m/n:  842361HF         RBL Lateral File, 3-Drawer                     $491.40     $491.40     8     70%        $343.98
 1    m/n:  1842TOP          RBL Custom Lateral File Top                    $113.33     $113.33     8     70%         $79.33
 1    m/n:  PWC53            RBL Channels - Wall                             $22.80      $22.80     8     70%         $15.96
 1    m/n:  MBS7216          RBL Shelf - Bookshelf                          $114.00     $114.00     8     70%         $79.80
 1    m/n:  PLP60RE          RBL Light Package - Task                       $112.20     $112.20     8     70%         $78.54
 1    m/n:  981870T          RBL Tackboard 70x18                             $87.60      $87.60     8     70%         $61.32
 1    m/n:  MD6630LCLP       MHM Desk                                       $711.60     $711.60     8     70%        $498.12
 1    m/n:  MR4824LRP        MHM Return                                     $465.00     $465.00     8     70%        $325.50
 1    m/n:  853030           MHM Square Table                               $218.40     $218.40     8     70%        $152.88
 1    m/n:  4571223          MHM Rolly Pneumatic Chair                      $380.40     $380.40     8     70%        $266.28
 2    m/n:  421382NM         MHM Side Sled Chair                            $228.60     $457.20     8     70%        $320.04
 2    m/n:  TQ1507T36        MHM Open Shelving 80x36x15                     $230.00     $460.00     8     70%        $322.00
 3    m/n:  842361HF         MHM Lateral File, 3-Drawer                     $491.40   $1,474.20     8     70%      $1,031.94
 1    m/n:  12618TOP         MHM Custom Lateral File Top                    $296.67     $296.67     8     70%        $207.67
 2    m/n:  MD6630LCLP       Desk                                           $711.60   $1,423.20     8     70%        $996.24
 2    m/n:  MR4824LRP        Return                                         $465.00     $930.00     8     70%        $651.00
 2    m/n:  2295             Open Bookcase 15x36x55 3 Shelf                 $255.00     $510.00     8     70%        $357.00
 4    m/n:  421482NM         Side Sled Chair                                $228.60     $914.40     8     70%        $640.08
 3    m/n:  330600AB         Double Pedestal Desk, 30x60                    $520.20   $1,560.60     8     70%      $1,092.42
 1    m/n:  2295             Boockcase, Open, 3-Shelf, 15x36x55             $255.00     $255.00     8     70%        $178.50
 3    m/n:  430312           Swivel/Tilt Chair                              $306.60     $919.80     8     70%        $643.86
 1    m/n:  85964236         Conference Table - Boat Shaped                 $596.40     $596.40     8     70%        $417.48
 8    m/n:  421312NM         Swivel Tilt conference Chair                   $309.00   $2,472.00     8     70%      $1,730.40
 4    m/n:  TQ1507T36        88x36 Wide Shelving                            $230.00     $920.00     8     70%        $644.00
 1    m/n:  MPNTM4136        Panel (Reception)                              $210.60     $210.60     8     70%        $147.42
 2    m/n:  MPNTM4130        Panel (Reception)                              $198.00     $396.00     8     70%        $277.20
 1    m/n:  MPNYM4142        Panel (Reception)                              $223.20     $223.20     8     70%        $156.24
 1    m/n:  MTWS3017M        Worksurface Transaction                        $116.40     $116.40     8     70%         $81.48
 1    m/n:  MTWS3617M        Worksurface Transaction                        $123.60     $123.60     8     70%         $86.52
 1    m/n:  MD6630LCR0       Reception Desk                                 $723.00     $723.00     8     70%        $506.10
 1    m/n:  PWR4224FXX       Worksurface Package                            $130.80     $130.80     8     70%         $91.56
 1    m/n:  MFES24           End Panel 24x27                                $116.40     $116.40     8     70%         $81.48
 1    m/n:  PWRS24CR         Cantilever                                      $22.80     $ 22.80     8     70%         $15.96
 1    m/n:  MP2824BBFL       Pedestal, 2 box, 1 file                        $236.40     $236.40     8     70%        $165.48
 1    m/n:  453530           Chair - Pneumatic                              $379.80     $379.80     8     70%        $265.86


                                     Page 2
<PAGE>

Metasyn, Inc.
Schedule A, Exhibit A
Sale / Leaseback

- ----------------------------------------------------------------------------------------------------------------------------------
                                                                                               Months
      Serial No./                                                          Unit        Total    Old       DVI        DVI 
Qty   Model No.              Description                                   Cost        Cost    4/5/93  Percentage  Valuation
- ----------------------------------------------------------------------------------------------------------------------------------
 1    m/n: 8418TOP          84x18 Common Top                               $163.33      $163.33     8      70%      $114.33
 2    m/n: 423481M          Side Chair (Visitor)                           $223.80      $447.60     8      70%      $313.32
 5    m/n: 1168-301         Maxwell Cloisonne 54"W                          $81.94      $409.70     8      70%      $286.79
 2    m/n: 842361HF         Lateral File                                   $491.40      $982.80     8      70%      $687.96
 2    m/n: 4571223          Rolly Pneumatic Chair                          $100.00      $200.00     8      70%      $140.00
 2    m/n: 451710           Stool Task                                      $57.04      $114.08     8      70%       $79.86
                                                                                                                 ----------
                                                                                                Subtotal         $17,000.00

Vendor:  Computers, Etc. Superstore, 216 Newbury Street, RT1S, Peabody, MA  01960
   8/9/92; Inv. # A212140
 1    s/n: LL101420         Shiva LanRover/L                               $499.00      $499.00     8      70%      $349.30
                            Remote Access Series for
                            Appletalk Network                                                                   -----------
                                                                                                Subtotal            $349.30
Vendor:  VWR, P.O. Box 232, Boston, MA  02101
   9/11/92;  Inv. #94819770
1     m/n: 55703-214        Explosion-Proof 14.7 cu.ft.                  $1,591.00    $1,591.00     7      70%    $1,113.70
                            Refrig.freezer
1     m/n: ZZMFG            Explosion-Proof Vacuum Pump,                 $1,144.00    $1,144.00     7      70%      $800.80
                            Belt Drive                                                                             ----------
                                                                                                 Subtotal         $1,914.50

Vendor:  MIT computer Connection, Stratton Student Center, Lower Level, Cambridge, MA
   9/8/92
2    s/n:  FC23621FC53      Mac IIsi 5/80                                 $1,505.00   $3,010.00     7      70%    $2,107.00
     s/n:  FC2361K)C53
8    m/n:  2x8 Simms        2x8 Simms Chip for Mac IIsi/ci (80               $60.00     $480.00     7      70%      $336.00
                            (4 in each machine)
2    m/n:  MO312            Apple Extended Keyboard                         $160.00     $320.00     7      70%      $224.00
2    m/n:  M0481LL/A        Mac IIsi NuBus Adapter Card                     $186.00     $370.00     7      70%      $259.00
1    s/n:  S12111SMD07      Mac 16" Display Monitor                       $1,160.00   $1,160.00     7      70%      $812.00
                             Video Card Installed                           $490.00     $490.00     7      70%      $343.00
1    s/n:  5257906          Apple High Resolution RGB Monitor              $ 580.00     $580.00     7      70%      $406.00
                                                                                                                   ---------
                                                                                                       Subtotal   $4,487.00

Vendor:  Fisher Scientific, 52 Fadem Road, springfield, NJ  07081
   9/17/92;  Inv. #9502225
 1   s/n:  1030954          Rotavapor                                     $2,295.00   $2,295.00     7      70%    $1,606.50

                                     Page 3

<PAGE>

Metasyn, Inc.
Schedule A, Exhibit A
Sale / Leaseback
- ----------------------------------------------------------------------------------------------------------------------------------
                                                                                               Months
      Serial No./                                                          Unit        Total    Old       DVI         DVI 
Qty   Model No.              Description                                   Cost        Cost    4/5/93  Percentage   Valuation
- ----------------------------------------------------------------------------------------------------------------------------------
 1   s/n:  M99874           Analytical Mettler Balance AE200            $2,085.00     $2,085.00     7      70%     $1,459.50
 1   s/n:  20800190         Oven                                          $385.00       $385.00     7      70%       $269.50
 1   s/n:  189694           Ultrasonic Clearner w/Digital Timer           $559.00       $559.00     7      70%       $391.30
   9/30/92;  Inv. #9605777
 1   m/n:  01-182-8         Explosion Proof Vacuum Pump
                            Direct Drive 40lb/min. 5u                     $920.00       $920.00     6      70%       $644.00
   10/2/92;  Inv. #9626838
 1   m/n:  01-911-174       Mettler Balance, PM 2000,
                            2100 gms; 0.01gm                            $1,494.00     $1,494.00     6      70%     $1,045.80
   11/4/92;  Inv. #9867025
 1   s/n:  922971000031     Fraction Collector, w/ 12/13 mm rac         $1,170.00     $1,170.00     5      80%       $936.00
   10/7/92;  Inv. #9660423
 1   m/n:  1500278-6        Rotovap MD M, Compact                       $1,650.00     $1,650.00     6      70%     $1,155.00
                            Condenses & Bath                                                                       ----------
                                                                                                        Subtotal   $7,507.60

Vendor:  The Holt Company, 24 Bedford Street, Waltham, MA  02254
   9/18/92;  Inv. #43028
 1   s/n:  1708361          In Focus Portable Overhead                    $395.00       $395.00     7      70%       $276.50
 1   s/n:  190902           Telex Slide Projector w/Auto Focus            $585.00       $585.00     7      70%       $409.50
                                                                                                                   ----------
                                                                                                        Subtotal     $686.00
Vendor:  VWR Scientific:  P.O. Box 232, Boston, MA  02101
   9/16/92;  Inv. #39064810
 1   m/n:  VLT60            Low Temp Immersion Proub Chiller              $735.00       $735.00     7      70%       $514.50
 1   m/n:  33918-330        Hot Plate Stirrer w/Temp Probe                $405.35       $405.35     7      70%       $283.75
                                                                                                                    ---------
                                                                                                        Subtotal     $798.25

Vendor:  Fisher Scientific, 52 Fadem Road, Springfield, NJ  07081
   10/7/92;  Inv. 9660428
 1   m/n:  RE111B           Rotor Evaporator 24/60                      $2,420.00     $2,420.00     6      70%     $1,694.00
     s/n:  0132111
 1   m/n:  01-115-4         Welch Vacuum Pump, 1.5 CFM,                   $857.00       $857.00     6      70%       $599.90
                                                                                                                    --------
                            115/230 V                                                                   Subtotal   $2,293.90


                                     Page 4
<PAGE>

Metasyn, Inc.
Schedule A, Exhibit A
Sale / Leaseback

- ----------------------------------------------------------------------------------------------------------------------------------
                                                                                               Months
      Serial No./                                                          Unit        Total    Old       DVI         DVI 
Qty   Model No.              Description                                   Cost        Cost    4/5/93  Percentage   Valuation
- ----------------------------------------------------------------------------------------------------------------------------------
Vendor:  Bruker Spectrospin (Canada) Ltd., 555 Steeles Avenue East, Milton, Ontario, Canada L9T 146
   1/14/93;  Inv. #T-546
 1   s/n:  PH2001            Minispec PC 120 as per quote              $39,950.00    $39,950.00     3     100%     $39,500.00
                                                                                                                  -----------
                             BM-923395                                                                 Subtotal    $39,500.00

Vendor:  Newark Electronics, 200 West Cumings Park, Woburn, MA  01802
   11/3/92;  Inv. #228442
 1   s/n:  193-00859         200 MHz Digital Storate Analog Scope         $998.00       $998.00     5      80%        $798.40
                                                                                                                   ----------
                                                                                                        Subtotal      $798.40

Vendor:  Bio-Rad, 85 Marcus Drive, Melville, NY  11747
   11/3/92;  Inv. #588563
 1   m/n:  2110              Econo Fraction Collector                     $555.00       $555.00     5      80%        $444.00
                                                                                                                   -----------
     s/n:  231BR-11308                                                                                  Subtotal      $444.00

Vendor:  Fisher Scientific, 52 Fadem Road, Springfield, NJ  07081
   1/4/93;  Inv. #0765815
1    m/n:  13-874-118C       Haake Refrigerating Circulator,            $2,150.00     $2,150.00     3     100%      $2,150.00
     s/n:  920099            D8-GH
   11/4/92;  Inv. #9867026
1    m/n:  01-094-22         Gas Pressure/Vacuum Pump                     $326.27       $326.27     5      80%        $261.02
                                                                                                                   ----------
     s/n:  0992                                                                                         Subtotal    $2,411.02

Vendor:  Mediquip, Inc., 2201 January Avenue, St. Louis, MO  63110
   1/8/93;  Inv. #14999
1    s/n:  3103PF            AMSCO Medallion 24x36x36 Lab              $20,329.00    $20,329.00     3     100%     $20,329.00
                             Sterilizer, Reconditioned,
                             Electro-Mechanical controls,
                             Single Manual Door, Recess Mounted
1                            Two Removable, Fixed Height                $1,425.00     $1,425.00     3     100%      $1,425.00
                             Shelves, for above
   1/19/93;  Inv. #15068
1    s/n:  88790-I           Glassware Washer with 30 Spindle           $8,000.00     $8,000.00     2     100%      $8,000.00
                             Header 7 Dolly Raci
                             Reconditioned Forma 8877
   12/27/92;  Inv. #14943
1    m/n:  LB-60             New Electric Steam Generator               $4,427.00     $4,427.00     3     100%      $4,427.00
                                                                                                                    -----------
     s/n:  31528             208v, 3PH/175 Amps                                                         Subtotal   $34,181.00


                                     Page 5

<PAGE>

Metasyn, Inc.
Schedule A, Exhibit A
Sale / Leaseback

- ----------------------------------------------------------------------------------------------------------------------------------
                                                                                               Months
      Serial No./                                                          Unit        Total    Old       DVI         DVI 
Qty   Model No.              Description                                   Cost        Cost    4/5/93  Percentage   Valuation
- ----------------------------------------------------------------------------------------------------------------------------------
Vendor:  Fisher Scientific, 52 Fadem Road, Springfield, NJ  07081
   11/10/92;  Inv. #9908524
1    m/n:  01-057-16A       Vacuum Pump 400 Liter 120V 50/60            $1,623.45     $1,623.45     5      80%       $1,298.76
     s/n:  SGL130522

1    m/n:  13-246-655G      IsoTemp 600 Series Lab Oven                 $1,086.25     $1,086.25     5      80%         $869.00
     s/n:  20400054
1    m/n:  17-156D          Eagle Safety Cabinet, 2 Dr., 2 Shelve         $467.50       $467.50     5      80%         $374.00
                                                                                                                      --------
                            45 Gallon                                                                   Subtotal     $2,541.76

Vendor:  APS Technologies, Kansas City, MO
   11/18/92;  Inv. #93-34372
1    s/n:  A114053          Archive Compression Ext.                    $1,599.00     $1,599.00     5      80%       $1,279.20
                                                                                                                     ----------
                            Brick with Retrospect                                                       Subtotal     $1,279.20

Vendor:  VWR Scientific, P.O. Box 232, Boston, MA  02101
   11/23/92;  Inv. #41776110
1    m/n:  27558-161        Buchi Rotavapor Re-111/E 24/40E             $2,499.00      $2,499.00    4      80%       $1,999.20
                                                                                                                     ----------
     s/n:  20400054                                                                                     Subtotal     $1,999.20

Vendor:  business Interiors, 529 Main Street, the Schrafft Center, Boston, MA  02129
   12/31/92;  Inv. #74004
1    m/n:  421271NM         Chair-Seg HI Back, Swivel tilt,               $440.40        $440.40    3     100%        $440.40
                                                                                                                      ---------
     Steelcase              UPH Arm, Pneu Hgt, Mono                                                      Subtotal     $444.40
                            Base-Cap:  6202 Grey V5

Vendor:  Sears Business Center, Executive Place IV, 54 Mall Road, Burlington, MA  01803
   1/14/93      
     s/n:  JPBF040242       HP laserJet 4M                              $1,766.01      $1,766.01    3      100%      $1,766.01
                                                                                                                      ----------
                                                                                                          Subtotal   $1,766.01

                                     Page 6


<PAGE>

Metasyn, Inc.
Schedule A, Exhibit A
Sale / Leaseback

- ----------------------------------------------------------------------------------------------------------------------------------
                                                                                               Months
      Serial No./                                                          Unit        Total    Old       DVI         DVI 
Qty   Model No.              Description                                   Cost        Cost    4/5/93  Percentage   Valuation
- ----------------------------------------------------------------------------------------------------------------------------------
Vendor:  fisher Scientific, 52 Fadem Road, Springfield, NJ  07081
   12/16/92;  Inv. #0684012
 1   m/n:  13-635-25         Accumet 25ph Meter, 120V, 60 Hz            $1,066.50      $1,066.50     4       80%         $853.20
                 s/n:  2273299
   12/30/92;  Inv. #0757311
 1   m/n:  RE111B            Buchi Evaporator, 24/40                    $2,425.00      $2,425.00     3      100%       $2,425.00
                                                                                                                     -----------
                 s/n:  1032110                                                                            Subtotal     $3,278.20

Vendor:  Balston Instruments, 260 neck Road, Box 8223, Haverhill, MA  01835
   1/5/93;  Inv. #107760
 1   s/n:  75511-            Completely Engineered Air Package          $5,262.00     $5,262.00      3      100%       $5,262.00
                             742061 Receiver Tank                         $374.00       $374.00      3      100%         $374.00
                                                                                                                      -----------
                                                                                                          Subtotal     $5,636.00

Vendor:  VWR Scientific, P.O. Box 232, Boston, MA  02101
   6/12/92;  Inv. #94805940
 1   m/n:  34741-152         Ice Maker Flaker, w/Bin, AF325             $2,835.00     $2,835.00     10       65%       $1,842.75
                                                                                                                       ----------
                                                                                                          Subtotal     $1,842.75

Vendor:  Yale Electric Sales Co., Inc., 296 Freeport Street, Dorchester, MA  02122
   6/17/92;  Inv. #72859
 1   m/n:  CTXY16F           Hotpoint Refrigerator                        $499.00      $499.00      10       65%         $324.35
     m/n:  1M1               Hope Ice Maker, Attached to refrigerator      $75.00       $75.00      10       65%          $48.75
                                                                                                                       ----------
                                                                                                          Subtotal       $373.10

                                                                                               Total this Schedule:  $142,142.84
</TABLE>

                                     Page 7


<PAGE>
                    CERTIFICATE OF INSPECTION AND ACCEPTANCE


This document is the "Acceptance Certificate" referred to in section 4 of the
Master Lease Agreement Number 8050 (the "Lease") dated as of December 21, 1992
between Dominion Ventures, Inc., ("Lessor") and Powersoft Corporation,
("Lessee"). This "Acceptance Certificate" relates to the equipment described in
Equipment Schedule A, (the "Equipment").

Lessee has not relied upon and acknowledges that Lessor has made no
representation or warranty of any kind, express or implied, with respect to the
Equipment, including without limitation its condition, merchantability or
fitness for any particular purpose. Lessee further acknowledges that Lessor has
accepted no responsibility for the transportation, installation or required
licensing necessary for the transfer, installation or use of the equipment.

Lessee certifies that the Equipment has been delivered to Lessee, has been
inspected by Lessee and has been found to be in good order and to satisfy the
specifications required by the Lease.

Lessee hereby represents and warrants to Lessor that (i) no event of default
under Section 25 of the Lease or event which, with the giving of notice or the
lapse of time, or both, would become such an event of default has occurred and
is continuing, except as disclosed in writing to Lessor, which disclosed event
has either been cured by Lessee or concerning which Lessee has provided evidence
to Lessor that Lessee is in the process of curing such default and is diligently
prosecuting such cure to completion (nothing herein shall constitute a waiver by
Lessor of any rights or remedies which it may have under the Lease with respect
to any event of default); and (ii) Lessee has obtained, and there are in full
force and effect, any insurance policies with respect to the Accepted Equipment
required to be obtained under the terms of the Lease.


                                          METASYN, INC.



Date:     4/28/93                         By: /s/ Randall B. Lauffer
                                             ------------------------------
                                          Title:  CEO



<PAGE>






                               EQUIPMENT SCHEDULE
                                       2-B

                   to Master Lease Agreement Number 8050
                             Dated December 21, 1992

LESSOR:  Dominion Ventures, Inc.   LESSEE:  Metasyn, Inc.
         44 Montgomery Street               71 Rogers Street
         Suite 4200                         Cambridge, MA 02142
         San Francisco, CA   94104

All terms and conditions of the above referenced Master Lease Agreement are
hereby expressly incorporated into this Equipment Schedule and made a part
hereof as if such terms and conditions were fully set forth herein. By their
execution of the Equipment Schedule the parties reaffirm all terms and
conditions of the Master Lease Agreement except as they may be modified hereby.
This Equipment Schedule shall become effective upon execution on date same is
executed by Lessor.

TOTAL EQUIPMENT COST OF THIS SCHEDULE:  $83,967.18

FUNDING EXPIRATION DATE:  June 30, 1993

RENTAL AMOUNT:  $2,787.71

INITIAL TERM:   36 Months

FREQUENCY:  Monthly in Advance

EQUIPMENT DESCRIPTION:  See Exhibit A Attached Hereto

ADVANCE RENTAL APPLIED:  Last Month's

COMMENCEMENT DATE:  July 1, 1993

SECURITY DEPOSIT:  $0.00

EQUIPMENT LOCATION:                                LESSEE CONTACT:

Metasyn, Inc.                                      Name:  Margot MacArthur
71 Rogers Street                                   Phone: 617-876-5920
Cambridge, MA  02142


IN WITNESS WHEREOF,

DOMINION VENTURES, INC.                      METASYN, INC.


By:  /s/ Randolph D. Werner                  By:  /s/ Randall B. Lauffer
   -----------------------------------           ------------------------------
Its: CFO                                     Its: CEO
   -----------------------------------           ------------------------------
Date:  6/16/93
   -----------------------------------



<PAGE>



                                  Metasyn, Inc.
                                  Schedule B
                                  Exhibit A
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------------
      Qty         Serial/Model #        Description                                  Unit Cost          Total Cost
- ----------------------------------------------------------------------------------------------------------------------
<S>              <C>                    <C>                                           <C>                   <C>

Vendor: Fisher Scientific, Dept. 177728-01, P.O. Box 405, Pittsburgh, PA 15230
    3/12/93      Invoice No. 1303012
       1         m/n: 09 548 105B       Buchi Rotavapor Rotary Evaporation             $2,206.00            $2,206.00
                 s/n:                   System, 24/40 w/jack 7 Bath
    4/15/93      Invoice No. 1548944
       1         m/n: 09 548 1088A      Plastic & Glass 24/40 RE-111B                  $2,630.00            $2,630.00
                 s/n:                   Buchi Rotavapor, Rotary Evaporation
                                        System

    5/12/93      Invoice No. 174544
       1         m/n: 01-913-275        Mettler Electronic Micro Balance               $7,618.00            $7,618.00
                                                                                                           -----------
                 s/n: 1032251           MT5 5.1Gx1GG 115/230V                           Subtotal            $12,454.00

Vendor:  Forma Scientific, Inc., P.O. Box 649, Marietta, OH 45750-0649
     4/6/93      Invoice No. 2381580
       1         m/n: 6097              Laboratory Dryer/Sterilizer-Oven               $6,873.30            $6,873.30
                                                                                                           -----------
                 s/n: N61573                                                            Subtotal            $6,873.30


Vendor: Hewlett Packard, P.O. Box 75629, Charlotte, NC 28275-5929
    4/21/93      Invoice No. 6PC2367
       1         s/n: 3137G02443        Programmable Fluorescence Detector             $9,600.00            $9,600.00
                                        with
       1                                HP-IB Interface (Option 305)                     $835.00              $835.00
       1                                Filter Kit I (Option 810)                        $285.00              $285.00
                                        Filter Kit iii (Option 812)                      $175.00              $175.00
                                                                                                          ------------
                                                                                        Subtotal           $10,895.00

Rainin Instrument Co., Inc., Mack Road, Box 4026, Woburn,  MA 01888-4026
     4/2/93                             Invoice No. 492116
       1         s/n:  C301481-9        SD-1 PREP HPLC SYSTEM CONSISTING OF
                     140037             THE FOLLOWING:
       2         m/n: 7105-032          Dynamax SD-1 Pump II 200ML/MIN US             $14,850.00           $29,700.00
       2         m/n: 7105-050          Dynamax SD-1 Pump w/o Heads US
       2         m/n: 7105-064          Pump Head Kit Titanium 200ML/MIN
       1         m/n: 81-410TO          Rainin TI Prep Dual Chamber Mixer 10ML         $1,125.00            $1,125.00
       2         m/n: 81-399            Mixer Mounting Bracket                            $36.00               $72.00
       2         m/n: 81-398            SD-1 Mixer L-Bracket                              $36.00               $72.00
       1         m/n: 81-400            Rainin Dynamax Dual Chamber Mixer                $585.00              $585.00
       1         m/n: 02-0199           Prime/Purge Valve                                 $87.12               $87.12
       1         m/n: 48-606            Prime/Purge Valve Bracket                         $35.10               $35.10
       1         m/n: 48-600            SS-MAST 5/18 x21"                                 $15.30               $15.30
       1         m/n: 81-5070           Dynamax Method Mgr, SD-1 Complete              $2,245.50            $2,245.50
       1         m/n: 38-DG115SI        Noise & Surge Suppressor w/6 Outlets              $44.95               $44.95
       1         m/n: 48-00XL           Drive Module HPXL                              $3,415.50            $3,415.50

                                     Page 1
<PAGE>

       1         m/n: 48-050-C          Pump Head Preparative 50ML/Min                 $1,075.50            $1,075.50
       1         m/n: 1-0165            Tee 3-Way 1/16                                    $45.41               $45.41
       1         m/n: 7125              Valve Sample Injection                           $547.20              $547.20
       1         m/n: 7161-020          Position Sensing Switch                           $69.30               $69.30
       1         m/n: 48-605            Injection Valve Bracket                           $67.50               $67.50
       1         m/n: 7024              Sample Loop 100UL                                 $28.80               $28.80
       1         m/n: 7026              Sample Loop 500UL                                 $34.20               $34.20
       1         m/n: 7028              Sample Loop 2.0ML                                 $59.40               $59.40
       1         m/n: 7200-030          Dynamax UV-1 UV/VIS Detector US                $4,495.50            $4,495.50
       1         m/n: 7200-075          Flowcell 9MM & !MM Prep Bulkhead TI              $805.50              $805.50
       1         m/n: U-446             Back Pressure Regulator SS 100PSI                 $82.80               $82.80
       2         m/n: 7060              Valve 6-Way                                      $355.50              $711.00
       2         m/n: 48-605            Injection Valve Bracket                           $67.50              $135.00
       1         m/n: 88-401            Dynamax Fraction Collector FC-1                $3,325.50            $3,325.50
       1         m/n: 88-420            Drain Valve 0-100ML/M F/FC-1                     $251.10              $251.10
       1         m/n: 88-417            Hi-Flow Funnel Rack F/267 Fractions              $308.70              $308.70
       1         m/n: 80-240-C8         Column Module C18 8U 41.4 x 250                $1,497.50            $1,497.50

     4/9/93                             Invoice No. 493701
       1         m/n: 80-220-C8         Column Module C18 8U 21.4 x 250                  $597.50              $597.50
                                                                                                        --------------
                                                                                       Subtotal            $51,534.88

Vendor: Parr Instrument, Company, 211 53rd St., Moline, IL 61265
    5/19/93                             Invoice No.: 7488
       1       s/n: 3911EG              Hydrogenation apparatus, 500 ML                $2,210.00            $2,210.00
                                        Shaker type, equipped with
                                        explosion proof motor, 115V 60HZ
                                                                                                         --------------
                                                                                        Subtotal             $2,210.00


                                                                            Total, This Schedule            $83,967.18

                                     Page 2

</TABLE>


<PAGE>

                    CERTIFICATE OF INSPECTION AND ACCEPTANCE


This document is the "Acceptance Certificate" referred to in section 4 of the
Master Lease Agreement Number 8050 (the "Lease") dated as of December 21, 1992
between Dominion Ventures, Inc., ("Lessor") and Powersoft Corporation,
("Lessee"). This "Acceptance Certificate" relates to the equipment described in
Equipment Schedule B, (the "Equipment").

Lessee has not relied upon and acknowledges that Lessor has made no
representation or warranty of any kind, express or implied, with respect to the
Equipment, including without limitation its condition, merchantability or
fitness for any particular purpose. Lessee further acknowledges that Lessor has
accepted no responsibility for the transportation, installation or required
licensing necessary for the transfer, installation or use of the equipment.

Lessee certifies that the Equipment has been delivered to Lessee, has been
inspected by Lessee and has been found to be in good order and to satisfy the
specifications required by the Lease.

Lessee hereby represents and warrants to Lessor that (i) no event of default
under Section 25 of the Lease or event which, with the giving of notice or the
lapse of time, or both, would become such an event of default has occurred and
is continuing, except as disclosed in writing to Lessor, which disclosed event
has either been cured by Lessee or concerning which Lessee has provided evidence
to Lessor that Lessee is in the process of curing such default and is diligently
prosecuting such cure to completion (nothing herein shall constitute a waiver by
Lessor of any rights or remedies which it may have under the Lease with respect
to any event of default); and (ii) Lessee has obtained, and there are in full
force and effect, any insurance policies with respect to the Accepted Equipment
required to be obtained under the terms of the Lease.


                                  METASYN, INC.



Date:     6/8/93                        By: /s/ Randall B. Lauffer
                                           ----------------------------
                                        Title:        CEO



<PAGE>






                               EQUIPMENT SCHEDULE
                                       3-C
                   to Master Lease Agreement Number 8050 Dated
                                December 21, 1992

LESSOR:  Dominion Ventures, Inc.   LESSEE:  Metasyn, Inc.
         44 Montgomery Street               71 Rogers Street
         Suite 4200                         Cambridge, MA 02142
         San Francisco, CA   94104

All terms and conditions of the above referenced Master Lease Agreement are
hereby expressly incorporated into this Equipment Schedule and made a part
hereof as if such terms and conditions were fully set forth herein. By their
execution of the Equipment Schedule the parties reaffirm all terms and
conditions of the Master Lease Agreement except as they may be modified hereby.
This Equipment Schedule shall become effective upon execution on date same is
executed by Lessor.

TOTAL EQUIPMENT COST OF THIS SCHEDULE:  $33,471.00

FUNDING EXPIRATION DATE:  June 30, 1993

RENTAL AMOUNT:  $1,111.24

INITIAL TERM:   36 Months

FREQUENCY:  Monthly in Advance

EQUIPMENT DESCRIPTION:  See Exhibit A Attached Hereto

ADVANCE RENTAL APPLIED:  Last Month's

COMMENCEMENT DATE:  July 1, 1993

SECURITY DEPOSIT:  $0.00

EQUIPMENT LOCATION:                       LESSEE CONTACT:
Metasyn, Inc.                             Name:  Margot MacArthur
71 Rogers Street                          Phone: (617)499-1400
Cambridge, MA  02142


IN WITNESS WHEREOF,

DOMINION VENTURES, INC.                    METASYN, INC.


By: /s/ Randolph Werner                    By:  /s/ Randall B. Lauffer
   -----------------------------               -------------------------------
Its: CFO                                   Its:  CEO
   -----------------------------               -------------------------------

Date:  6/30/93                             Date: 6/28/93
   -----------------------------               -------------------------------


<PAGE>

                                  Metasyn Inc.
                                  Exhibit A (Schedule 8050 3C)

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
                  INVOICE QTY  MODEL NUMBER/                                                        FEATURE   EQUIPMENT
VENDOR NAME       NUMBER       SERIAL NUMBER EQUIPMENT DESCRIPTION   FEATURE DESCRIPTION            COST      COST
- -----------------------------------------------------------------------------------------------------------------------------------
<S>               <C>     <C>  <C>           <C>                     <C>                          <C>         <C>
FISHER SCIENTIFIC          1   S/N: 1032386  BUCHI ROTARY  EVAPRTR   PLASTIC & GLASS 24/40RE-111C  $2,634.00   $4,354.00
                                                                     SYRINGE PUMP, 115VAC 50/60HZ  $1,720.00
FISHER SCIENTIFIC          2   S/N: 1032389  BUCHI ROTARY  EVAPRTR                                             $5,310.00
                                                                                                              ..........
                               S/N: 1032392  BUCHI ROTARY  EVAPRTR
FISHER SCIENTIFIC                                                                                              $9,664.00
PACKARD                    1   S/N: 403410   COBRA II/SPECTRAVW      COBRA II, M/N; 5003          $23,807.00  $23,807.00
                                                                                                              ..........
PACKARD                                                                                                       $23,807.00

       GRAND TOTAL                                                                                            $33,471.00

</TABLE>



<PAGE>

                    CERTIFICATE OF INSPECTION AND ACCEPTANCE


This document is the "Acceptance Certificate" referred to in section 4 of the
Master Lease Agreement Number 8050 (the "Lease") dated as of December 21, 1992
between Dominion Ventures, Inc., ("Lessor") and Powersoft Corporation,
("Lessee"). This "Acceptance Certificate" relates to the equipment described in
Equipment Schedule C, (the "Equipment").

Lessee has not relied upon and acknowledges that Lessor has made no
representation or warranty of any kind, express or implied, with respect to the
Equipment, including without limitation its condition, merchantability or
fitness for any particular purpose. Lessee further acknowledges that Lessor has
accepted no responsibility for the transportation, installation or required
licensing necessary for the transfer, installation or use of the equipment.

Lessee certifies that the Equipment has been delivered to Lessee, has been
inspected by Lessee and has been found to be in good order and to satisfy the
specifications required by the Lease.

Lessee hereby represents and warrants to Lessor that (i) no event of default
under Section 25 of the Lease or event which, with the giving of notice or the
lapse of time, or both, would become such an event of default has occurred and
is continuing, except as disclosed in writing to Lessor, which disclosed event
has either been cured by Lessee or concerning which Lessee has provided evidence
to Lessor that Lessee is in the process of curing such default and is diligently
prosecuting such cure to completion (nothing herein shall constitute a waiver by
Lessor of any rights or remedies which it may have under the Lease with respect
to any event of default); and (ii) Lessee has obtained, and there are in full
force and effect, any insurance policies with respect to the Accepted Equipment
required to be obtained under the terms of the Lease.


                                  METASYN, INC.



Date:     6/28/93                       By:    /s/ Randall B. Lauffer
     ------------------------------        ------------------------------
                                        Title:        CEO
                                           ------------------------------


<PAGE>





                               EQUIPMENT SCHEDULE
                                       4-D
                   to Master Lease Agreement Number 8050 Dated
                                December 21, 1992

LESSOR:  Dominion Ventures, Inc.   LESSEE:  Metasyn, Inc.
         44 Montgomery Street               71 Rogers Street
         Suite 4200                         Cambridge, MA 02142
         San Francisco, CA  94104

All terms and conditions of the above referenced Master Lease Agreement are
hereby expressly incorporated into this Equipment Schedule and made a part
hereof as if such terms and conditions were fully set forth herein. By their
execution of the Equipment Schedule the parties reaffirm all terms and
conditions of the Master Lease Agreement except as they may be modified hereby.
This Equipment Schedule shall become effective upon execution on date same is
executed by Lessor.

TOTAL EQUIPMENT COST OF THIS SCHEDULE:  $327,472.37

FUNDING EXPIRATION DATE:  June 30, 1993

RENTAL AMOUNT:  $10,872.08

INITIAL TERM:   36 Months

FREQUENCY:  Monthly in Advance

EQUIPMENT DESCRIPTION:  See Exhibit A Attached Hereto

ADVANCE RENTAL APPLIED:  Last Month's

COMMENCEMENT DATE:  July 1, 1993

SECURITY DEPOSIT:  $0.00

EQUIPMENT LOCATION:                       LESSEE CONTACT:

Metasyn, Inc.                             Name:  Margot MacArthur
71 Rogers Street                          Phone: (617)499-1400
Cambridge, MA  02142

IN WITNESS WHEREOF,

DOMINION VENTURES, INC.                   METASYN, INC.


By:  /s/ Randolph Werner                  By:  /s/ Randall B. Lauffer
    --------------------------------          ---------------------------------
Its:             CFO                      Its:            CEO
    --------------------------------          ---------------------------------
Date:          6/30/93                                    6/28/93
    --------------------------------          ---------------------------------




<PAGE>

                                  Metasyn, Inc.
                                  Schedule D - Sale/Leaseback
                                  Exhibit A
<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                                               Months
Qty    Serial/Model #       Description                                Unit Cost  Total Cost     Old     Percentage   Valuation
- -----------------------------------------------------------------------------------------------------------------------------------
<S>     <C>                 <C>                                       <C>         <C>             <C>     <C>          <C>
6/16/93
Vendor: Varian Instruments, 3120 Hansen Way, Palo Alto, CA 94304
     1/13/93    P.O. # 50-00193, Inv. 031-28399A,031-28399B
 1      s/n: 5008084        Unity 300 with Varian Superconducting     $212,500.00 $212,500.00      5       80%         $170,000.00
                                                                                  -----------                          -----------
                            Magnet & Peripherals                        Subtotal  $212,500.00                          $170,000.00

Vendor: Hewlett Packard Company, 29 Burlington Mall Road, Burlington, MA 01803
     1/29/93  P.O. # 50-00214, Inv. 6N21359

 1      s/n:32478A03958     HPLC 1090M Series II Liquid Chromato-      $46,300.00  $46,300.00      5       80%          $37,040.00
 1                          graph Mainframe plus
 1                          Ternary PV5 solvent delivery system
 1                          Variable volume injector 2/25 ul
 1                          Autosampler
 1                          Temperature controlled column compratment
 1                          Diode array dtector series II
 1                          Manual injector valve                       $1,500.00   $1,500.00      5       80%           $1,200.00
     1/29/93                Inv. 6MW1561
 1      s/n: 2510A03293     Spectroscopy System-Standard Version       $11,600.00  $11,600.00      5       80%           $9,280.00
                                                                                  ------------                         -----------
                                                                        Subtotal   $59,400.00                           $47,520.00

Vendor: Varian NMR Instruments, 3120 Hansen Way, Palo Alto, CA 94304
     2/4/93    P.O. # 50-00226, Inv. 28458D

 1      s/n: Z49M3836       SparcStation IPC Computer                   $4,920.00   $4,920.00      4       80%           $3,936.00
                                                                                   ----------                            ---------
                                                                        Subtotal    $4,920.00                            $3,936.00


                                     Page 1

<PAGE>
                                  Metasyn, Inc.
                                  Schedule D - Sale/Leaseback
                                  Exhibit A
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                                               Months
Qty    Serial/Model #       Description                                Unit Cost  Total Cost     Old     Percentage   Valuation
- -----------------------------------------------------------------------------------------------------------------------------------

Vendor: Business Interiors, 529 Main Street, The Schraftt Ct, Boston, MA 02129
     2/26/93   P.O. # 60-00232A, Inv. 477806

 4      Cat. # 842361RW     Lateral 3- Drawer File Cabinet                $491.40   $1,965.60      4       80%           $1,572.48
 4      Cat. # 4218top      Selfedge Top 42" x 18"                        $113.33     $453.32      4       80%             $362.66
 2      Cat. # 6636LCRP     Desk-Sgl Ped, RH, Lam, LK, CD                 $740.40   $1,480.80      4       80%           $1,184.64
 2      Cat. # MR4824LLP    Return-Dsk Ht, 1 Cabt LH, LAM                 $465.00     $930.00      4       80%             $744.00
 4      Cat. # 842561RW     Lateral File, 4 drawer, 1 shelf               $790.00   $3,160.00      4       80%           $2,528.00
 3      Cat. # MD6Y030LCD   Double Pedestal Desk, 30x60                   $852.00   $2,556.00      4       80%           $2,044.80
     2/19/93                Inv. 77319
 1      Cat. # 33060080     Single Pedestal Desk, 30 x 60                 $455.00     $455.00      4       80%             $364.00
 1      Cat. # 33K47LRH     Return Clamp                                  $325.00     $325.00      4       80%             $260.00
                                                                                  -----------                           ----------
                                                                        Subtotal   $11,325.72                            $9,060.58

Vendor: Brinkman Instruments, Inc.,  One Cantiague Road, Westbury, NY 11590
     3/8/93    P.O. #50-00249, Inv. 972465
 1      s/n: 7N71326        Titration Stand 2.665.0030, includes Magnet $3,265.00   $3,265.00      3      100%           $3,265.00
                            & Peripherals and
 4                          Interchangeable "Snap-In" Buret Unit 696-5,   $600.00   $2,400.00      3      100%           $2,400.00
                            5ml, with Anti-Diffusion Buret Tip 6.1541.010
 1                          Keyboard Unit 6.2124.000, for remote contro   $415.00     $415.00      3      100%             $415.00
                            of Dosimat 665                                        ------------                         -----------
                                                                        Subtotal    $6,080.00                            $6,080.00

Vendor: CompuCom Systems, 313 Speen Street, Natick, MA 01760
     1/21/93   P.O. #60-00250, Inv. 80216817

 1      s/n: SF12454S3724   Macintosh IIci 5 MB HD80 w/ Cache Card      $1,924.00   $1,924.00      5       80%           $1,539.20
                            Apple SE, MAC II Extended keyboard            $146.00     $146.00      5       80%             $116.80
 1      s/n: DCH2300A0157   Radius 2-Page Mono-Grayscale Monitor w/       $872.00     $872.00      5       80%             $697.60
                                                                                  ------------                          -----------
                                                                        Subtotal    $2,942.00                            $2,353.60


                                     Page 2

<PAGE>
                                  Metasyn, Inc.
                                  Schedule D - Sale/Leaseback
                                  Exhibit A
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                                               Months
Qty    Serial/Model #       Description                                Unit Cost  Total Cost     Old     Percentage   Valuation
- -----------------------------------------------------------------------------------------------------------------------------------

Vendor: The Baker Company, 24 Stiles Road, Suite 201, P.O. Box 650, Salem, NH 03079
     2/26/93   P.O. #50-00263.
                           Inv. 065330
 1      s/n: SL-47002V     4'Class Ii, Type A. Vert Downflow Biological $4,261.32   $4,261.32      4       80%           $3,409.06
                           Downflow Safety Cabinet
                           Inv. 065330-1
 1      s/n: 465906        4'Horizontal laminar Flow Clean Bench        $2,915.64   $2,915.64      4       80%           $2,332.51
                                                                                  -----------                          ------------
                                                                        Subtotal    $7,176.96                            $5,741.57

Vendor: Fisher Scientific, 52 Fadem Road, Springfield, NJ 07081
               P.O. # 50-00292
     4/2/93                 Inv. # 1462833
 1      s/n: 930821000021   CF-1 Fraction Collector 115V                $1,330.00   $1,330.00      3      100%           $1,330.00
     3/11/93                Inv. # 1292849
 1      s/n: 186281         UV Monitor                                  $2,397.00   $2,397.00      3      100%           $2,397.00
     2/15/93                Inv. # 1086546
 1      s/n: 186192         Gradient Monitor                            $1,330.00   $1,330.00      4       80%           $1,064.00
 1      s/n: 63B35368       Single Pen Recorder                           $940.00     $940.00
     3/4/93                 Inv. # 1237937
 1      s/n: 223259         Spectrum Peristaltic Pump                     $665.00     $665.00      3      100%             $665.00
                            P.O. # 50-00293A
     3/3/93                 Inv. 1226572
 1      s/n: 77503          Welch Vacuum Pump 115Vac 60 Hz              $1,115.00   $1,115.00      3      100%           $1,115.00
     2/19/93                Inv. # 1137490
 1      s/n: 41011007405    Welch Vacuum Pump 115Vac 60 Hz                $955.00     $955.00      4       80%             $764.00
     2/22/93                Inv. # 1148405
 2                          Precision Vacuum Pump Model D-25              $755.00   $1,510.00      4       80%           $1,208.00
 1                          Refrigerator/Freezer                        $1,153.00   $1,153.00      4       80%             $922.40



                                     Page 3



<PAGE>

                                  Metasyn, Inc.
                                  Schedule D - Sale/Leaseback
                                  Exhibit A
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                                               Months
Qty    Serial/Model #       Description                                Unit Cost  Total Cost     Old     Percentage   Valuation
- -----------------------------------------------------------------------------------------------------------------------------------
     2/19/93             Inv. # 1137490
 2      s/n: 30100004, 3    Isotemp 630G Oven                             $720.00   $1,440.00      4       80%           $1,152.00
                         P.O. # 50-00293B
     4/22/93             Inv. # 1603261
 1      s/n:                Electrical Bal. 4000/.1G115VDI-4KD          $1,030.00   $1,030.00      2      100%           $1,030.00
                                                                                   ----------                          ------------
                                                                        Subtotal   $13,865.00                            $11,647.40

Vendor: Nicolet Instrument Corp., 5225 Vernoa Rd., Madison, WI 53744
     3/26/93    P.O. # 50-002989, Inv. VT009037
 1      s/n: ACK9300157     Impact 400 Spectrometer                    $17,000.00  $17,000.00       3     100%          $17,000.00
                                                                                   ----------                           -----------
                                                                        Subtotal   $17,000.00                            $17,000.00

Vendor: Business Interiors, 529 Main Street, The Schrafft Ct., Boston, MA 02129
     3/24/96    P.O. # 60-00310, Inv. 479348
 4      Cat. # 230600AB     Double Pedestal Desks                         $509.60   $2,038.40       3     100%           $2,038.40
                                                                                   ----------                           -----------
                                                                        Subtotal    $2,038.40                             $2,038.40
Vendor: Computer City, 29-422, 341 Cochituate, Framingham, MA 01701
     4/10/93                                            P.O. # 50-00320, Inv. 013097
 1      s/n: F1312EAYCAB    Macintosh Centris 650 8/230                 $3,098.00   $3,098.00       2     100%           $3,098.00
 1      s/n: S12495PAE04    Macintosh 14" Color Display                   $498.00     $498.00       2     100%             $498.00
                                                                                   ----------                           -----------
                                                                        Subtotal    $3,596.00                             $3,596.00
Vendor: CompUSA, 500 Cochituate RD, Framingham, MA 01701
     3/28/93                                            P.O. # 60-00359
 1      s/n:  SG306D40VA2   Apple Mac Extended Keyboard                   $169.99     $169.99       3     100%             $169.99
 1      s/n: AP24435K5      Apple MAC LCIII4/80                         $1,239.98   $1,239.98       3     100%           $1,239.98
                                                                                   ----------                            -----------
          MO312                                                         Subtotal    $1,409.97                             $1,409.97



                                     Page 4

<PAGE>

                                  Metasyn, Inc.
                                  Schedule D - Sale/Leaseback
                                  Exhibit A
- ----------------------------------------------------------------------------------------------------------------------------------
                                                                                               Months
Qty    Serial/Model #       Description                                Unit Cost  Total Cost     Old     Percentage   Valuation
- -----------------------------------------------------------------------------------------------------------------------------------

Purchased by Kaplan Corp. for Metasyn
Vendor: Kewaunee Scientific Corporation, Statesville, NC 28677
     7/30/92   P.O. # 50-00424
 2                          Kemressin Fume Hoods                       $10,837.00  $10,837.00      11       65%           $7,044.05
     1/23/93   Inv. #4992
 8                          Kemressin Fume Hoods with following         $5,278.75  $42,230.00       5       80%          $33,784.00
                            attachments
 8                          Auxiliary Air Chambers                        $145.25   $1,162.00       5       80%             $929.60
 4                          Fume Hods Alarms                              $375.00   $1,500.00       5       80%           $1,200.00
 3                          Argon Fixture                                  $69.00     $207.00       5       80%             $165.60
 3                          Vacuum Fixture                                 $69.00     $207.00       5       80%             $165.60
                                                                                   -----------                            ---------
                                                                        Subtotal   $56,143.00                            $43,288.85

Vendor: Air Energy, Inc., 480 Nepponset St.,  Canton, MA 02021
     3/8/93   P.O. 50-00428 Inv. 12551
 1      s/n: 776946         Vacuum Pump Package                         $3,800.00   $3,800.00      3      100%           $3,800.00
                                                                                   ----------                           -----------
                                                                        Subtotal    $3,800.00                            $3,800.00

                                                                        Total, this Schedule:                          $327,472.37


</TABLE>

                                     Page 5

<PAGE>

                    CERTIFICATE OF INSPECTION AND ACCEPTANCE


This document is the "Acceptance Certificate" referred to in section 4 of the
Master Lease Agreement Number 8050 (the "Lease") dated as of December 21, 1992
between Dominion Ventures, Inc., ("Lessor") and Powersoft Corporation,
("Lessee"). This "Acceptance Certificate" relates to the equipment described in
Equipment Schedule D, (the "Equipment").

Lessee has not relied upon and acknowledges that Lessor has made no
representation or warranty of any kind, express or implied, with respect to the
Equipment, including without limitation its condition, merchantability or
fitness for any particular purpose. Lessee further acknowledges that Lessor has
accepted no responsibility for the transportation, installation or required
licensing necessary for the transfer, installation or use of the equipment.

Lessee certifies that the Equipment has been delivered to Lessee, has been
inspected by Lessee and has been found to be in good order and to satisfy the
specifications required by the Lease.

Lessee hereby represents and warrants to Lessor that (i) no event of default
under Section 25 of the Lease or event which, with the giving of notice or the
lapse of time, or both, would become such an event of default has occurred and
is continuing, except as disclosed in writing to Lessor, which disclosed event
has either been cured by Lessee or concerning which Lessee has provided evidence
to Lessor that Lessee is in the process of curing such default and is diligently
prosecuting such cure to completion (nothing herein shall constitute a waiver by
Lessor of any rights or remedies which it may have under the Lease with respect
to any event of default); and (ii) Lessee has obtained, and there are in full
force and effect, any insurance policies with respect to the Accepted Equipment
required to be obtained under the terms of the Lease.


                                METASYN, INC.



Date:     June 28, 1993         By: /s/ Randall B. Lauffer
                                   ---------------------------------------
                                Title:        CEO



<PAGE>


                                  BILL OF SALE


Metasyn, Inc., ("Seller"), for good and valuable consideration, does hereby
grant, bargain, sell, transfer and set over unto Dominion Ventures, Inc.,
("Buyer"), its successors, assigns, including any partnership, and the partners
therein (general and limited), the following:

Number     Part Number      Description            Total Cost

     See Attached Equipment List Exhibit A       $327,472.37


TO HAVE AND TO HOLD the Equipment to the Buyer, its successors and assigns, for
its and their own use and behalf forever.

And Seller hereby represents and warrants to Buyer, its successor and assigns,
that as of the date hereof:

1.   Seller has legal title to each item of Equipment and good and lawful right
     to sell such item of equipment.

2.   No item of Equipment is subject to any lien or encumbrance of any nature.

3.   Each item of Equipment is in good repair, condition and working order, in
     accordance with accepted industry practices.

4.   Each item of Equipment has been used predominantly in the United States.

5.   No item of Equipment has been leased or sublet to any governmental agency
     or tax exempt organization.

Seller covenants that it will warrant and defend such title against all claims
and demands whatsoever.

IN WITNESS WHEREOF, Seller has caused this instrument to be duly executed in its
name by its officers thereunto duly authorized this 28th day of June, 1993.


                             METASYN, INC.


                             By: /s/ Randall B. Lauffer
                                ---------------------------------
                             Title:      CEO
                                ---------------------------------
                             Date:      6/28/93
                                ---------------------------------


<PAGE>



                               EQUIPMENT SCHEDULE
                                       5E

                      to Master Lease Agreement Number 8050
                            Dated December 21, 1992

LESSOR: Dominion Ventures, Inc.   LESSEE:  Metasyn, Inc.
        44 Montgomery Street               71 Rogers Street
        Suite 4200                         Cambridge, MA  02142
        San Francisco, CA   94104

All terms and conditions of the above referenced Master Lease Agreement are
hereby expressly incorporated into this Equipment Schedule and made a part
hereof as if such terms and conditions were fully set forth herein. By their
execution of the Equipment Schedule the parties reaffirm all terms and
conditions of the Master Lease Agreement except as they may be modified hereby.
This Equipment Schedule shall become effective upon execution on date same is
executed by Lessor.

TOTAL EQUIPMENT COST OF THIS SCHEDULE:  $96,041.39

FUNDING EXPIRATION DATE:  September 30, 1993

RENTAL AMOUNT:  $3,188.57

INITIAL TERM:   36 Months

FREQUENCY:  Monthly in Advance

EQUIPMENT DESCRIPTION:  See Exhibit A Attached Hereto

ADVANCED RENTAL APPLIED:  Last Month's

COMMENCEMENT DATE:  October 1, 1993

SECURITY DEPOSIT:  $0.00

EQUIPMENT LOCATION:                  LESSEE CONTACT:

Metasyn, Inc.                        Name:  Margot MacArthur
71 Rogers Street                     Phone: (617) 499-1400
Cambridge, MA  02142

IN WITNESS WHEREOF,

DOMINION VENTURES, INC.              METASYN, INC.


By:  /s/ Randolph Werner             By: /s/ Randall B. Lauffer
     ----------------------------       -----------------------------
Its:           CFO                   Its: Chairman & CEO
     ----------------------------       -----------------------------
Date:        10/1/93                              9/22/93
     ----------------------------       -----------------------------

<PAGE>


                                  Metasyn, Inc.
                                  Schedule E - Sale/Leaseback
                                  Exhibit A
<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------------------------
                                                                                               Months                   DVI
Qty   Serial/Model #       Description                                Unit Cost  Total Cost     Old     Percentage   Valuation
- ---------------------------------------------------------------------------------------------------------------------------------
<S>     <C>                 <C>                                        <C>        <C>             <C>         <C>       <C>

Vendor: Andataco, 9550 Waples Street, San Diego, CA 92121
5/26/93 Inv. # 0054184-In
  1     s/n: 6006169        ExaByte 8-mm External Drive for            $1,619.00   $1,619.00         4          80%     $1,295.20
                            Sun IPC

Vendor: Computer City SuperCenter, 341 Cochituate Road, Framingham, MA 01701
Inv. Dat Inv. # 030204
5/26/93
  1     s/n: SFC310D1AC78    Macintosh Duo 230 2/4MB Ram & 120MB HD    $2,348.00   $2,348.00         4          80%     $1,878.40
  1     s/n: STF3031RDG09    Macintosh duo Dock                          $999.00     $999.00         4          80%       $799.20
  1     Ct. 21-10016         Apple Extended Keyboard                     $155.00     $155.00         4          80%       $124.00
6/2/93 Inv. # 032174
  1                          MacExpress Modem (installed in computer)    $299.00     $299.00         4          80%       $239.20

Vendor: USA Flex, 471 Brighton Dr, Bloomington, IL 60108
Inv. Dat Inv. # 7582646
6/10/93
  1     s/n: 8119337         Multisync 21" .28 Col Pitch               $2,299.00   $2,299.00         3         100%     $2,299.00
                             Computer Monitor
               with          MacFG 8x Color Interface Card               $659.00     $659.00         3         100%       $659.00

Vendor: New England Airco, 90 Research Road, Hingham, MA 02043
5/26/93 Inv. # 108228
  1     s/n: 9306071         Automatic Switchover System                 $515.00     $515.00         4          80%       $412.00
                             bt/w 2 cylinders

Vendor: Fisher Scientific, 52 Fadem Road, Springfield, NJ 07081
6/11/93 Inv. # 1975046
  1     s/n: L42123          Dry Ice Maker 16oz                          $506.25     $506.25         3         100%     $506.25



                                     Page 1

<PAGE>

                                  Metasyn, Inc.
                                  Schedule E - Sale/Leaseback
                                  Exhibit A
- ---------------------------------------------------------------------------------------------------------------------------------
                                                                                               Months                    DVI
Qty    Serial/Model #       Description                                Unit Cost  Total Cost     Old     Percentage   Valuation
- ---------------------------------------------------------------------------------------------------------------------------------

Vendor: Perkin-Elmer, 150 Wells Avenue, Newton Centre, MA 02159
6/22/93 Inv. # 0439550
  1     s/n: 20367           Model LC-240 Luminescence Detector        $7,693.00   $7,693.00         3          100%    $7,693.00

Vendor: Fisher Scientific, Dept 22363-01, Pittsburgh, PA 15230
6/23/93 Inv. # 2075108
  1     s/n: BDX-1274        Mini Tox Vacuum                             $680.00     $680.00         3          100%      $680.00
8/12/93
  1     s/n: 0696            Wheaton Unispense Peristaltic Pump        $1,245.83   $1,245.83         1          100%    $1,245.83
                             with Standard 110vac
Vendor: Chem Glass, 3861 N. Mill Road, Vineland, NJ 08360
6/28/93 Inv. # 274541
  1     s/n: 171513          Teflon KNF Vacuum Pump                      $910.00     $910.00         3          100%      $910.00

Vendor: Fisher Scientific, 52 Fadem Road, Springfield, NJ 07081
7/16/93 Inv. # 2221174
  1     s/n: 00503693        Denver Toploading Balance                   $770.00     $770.00         2          100%      $770.00
                             XL300 115V50/60HZ

7/29/93 Inv. 2333231
  1     s/n: 49606           Brinkman Polytron Homogenizer P10/35      $1,780.00   $1,780.00         2          100%    $1,780.00
  1     s/n: 4715MS12WB10    Fiber Optics Dual Illuminator               $600.00     $600.00         2          100%      $600.00

7/12/93 Inv. # 2187712
  1     s/n: 9664            Brinkman Standard Generator w/Saw Teeth     $920.00     $920.00         2          100%      $920.00

7/9/93 Inv. # 2177321
  1     M/N: PT10/35         StereoZoom Microscope w/Universal Stand   $1,460.00   $1,460.00         2          100%    $1,460.00


                                     Page 2

<PAGE>

                                  Metasyn, Inc.
                                  Schedule E - Sale/Leaseback
                                  Exhibit A
- ---------------------------------------------------------------------------------------------------------------------------------
                                                                                               Months                    DVI
Qty    Serial/Model #       Description                                Unit Cost  Total Cost     Old     Percentage   Valuation
- ---------------------------------------------------------------------------------------------------------------------------------

Vendor: Packard Instrument, 800 Research Parkway, Meriden, CT 06450
7/13/93 Inv. # 93631078
  1     s/n: 000001          Portable Utility Cart for use/              $800.00     $800.00         2          100%      $800.00
                             Gamma Counter
Vendor: Computer City,  341 Cochituate, Framingham, MA 01701
7/18/93 Inv. # 042775
  1     s/n: TF30613RLGO     Apple Color Onescanner                    $1,199.00   $1,199.00         2          100%    $1,199.00

Vendor: Yale Electronic, 296 Freeport Street, Dorchester, MA
7/21/93 Inv. # 1114201
  1     s/n: WB32300586      GE Manual Defrost Upright Freezer,          $525.00     $525.00         2          100%      $525.00
                             20.7 cu ft

Vendor: Northeast Scientific Co. 62 Wilshire Park, Needham, MA 02192
7/27/93 Inc. # 1714
  1     s/n: 71743           Capintech CRC7 w/RS-232 Interface         $5,750.00   $5,750.00         2          100%    $5,750.00

Vendor: Harvard Apparatus, 22 Pleasant St, So. Natick, MA 01760
7/21/93 Inv. 705647
  1     m/n: 130             Small Animal Decapitator                    $550.00     $550.00         2          100%      $550.00

Vendor: Beckman Instruments, Inc. 108 Columbia, MD 21045
7/19/93 Inv. # 232722CL00A
  1     s/n: L7Z93H02        L7-35 Ultracentrifuge Air 60hz           $24,705.00  $24,705.00         2          100%   $24,705.00
  1     s/n: 93U3331         Type 70, iTi Fixed Angle, Titanium rotor  $7,656.00   $7,656.00         2          100%    $7,656.00




                                     Page 3
<PAGE>

                                  Metasyn, Inc.
                                  Schedule E - Sale/Leaseback
                                  Exhibit A
- ---------------------------------------------------------------------------------------------------------------------------------
                                                                                               Months
Qty    Serial/Model #       Description                                Unit Cost  Total Cost     Old     Percentage   Valuation
- ---------------------------------------------------------------------------------------------------------------------------------
  1     s/n: GYB92L20        GS-15R Refrigerated Tabletop Centrifuge   $5,062.50   $5,062.50         2          100%    $5,062.50
  1     s/n: 93/92-11B       S4180 Swinging Bucket Rotor               $1,125.00   $1,125.00         2          100%    $1,125.00
  1     s/n: 115-92 23       F1010 Fixed Angle Rotor                     $765.00     $765.00         2          100%      $765.00

Vendor: CompuD, 6741 Van Nuys Boulevard, VanNuys, CA 91405
8/2/93 Inv. # 30958
  1     s/n: T4703           Powerbook 170 Computer, 4/120             $1,995.00   $1,995.00         1          100%    $1,995.00

Vendor: Fisher Scientific, 52 Fadem Road, Springfield, NJ 07081
9/1/93 Inv. # 2595542
  1     Ct. # 97-150G        Metal Standing Height Base, Cabinet, Gray   $593.00     $593.00         0          100%      $593.00
8/13/93 Inv. # 2451756
  1     Ct. 94MC1            Modular Worktop for Base Cabinet            $105.00     $105.00         1          100%      $105.00
8/24/93 Inv. # 2530942
  1     s/n: 240015          Freezer Dryer                             $4,065.00   $4,065.00         1          100%    $4,065.00
  1     s/n: THL100808       Maxima Vacuum Pump Model D8C              $1,335.00   $1,335.00         1          100%    $1,335.00
  1     s/n: 77503           Welch Duo Seal 1400 Pump                    $845.00     $845.00         1          100%      $845.00
8/25/93 Inv. # 2542754
  1     Ct. # 1026913        Drying Chamber 12 Port                      $695.00     $695.00         1          100%      $695.00
8/31/93 Inv. # 2583511
  1     s/n: C37JXDP-153     Welch DirecTorr Direct Drive, Pump 1.5CFM   $880.95     $880.95         0          100%      $880.95
                             115/230V

Vendor: Shreve Systems, 1200 Marshall Street, Shreveport, LA 71101
9/2/93 Inv. # 39336
  1     s/n: PB306009        Supermac Superview                          $279.00     $279.00         0          100%      $279.00

Vendor: Mac Xtra, 1075 Belleview Way, NE Suite 114, Belleview, WA 98004
9/8/93 Inv. # 010225
  1     in computer below     4 MB Memory Chip for Mac Centris 660 AV    $184.00     $184.00         0          100%      $184.00
  1     in computer below     8 MB Memory Chip for Mac LCIII             $350.00     $350.00         0          100%      $350.00


                                     Page 4
<PAGE>

                                  Metasyn, Inc.
                                  Schedule E - Sale/Leaseback
                                  Exhibit A
- ---------------------------------------------------------------------------------------------------------------------------------
                                                                                               Months                    DVI
Qty    Serial/Model #       Description                                Unit Cost  Total Cost     Old     Percentage   Valuation
- ---------------------------------------------------------------------------------------------------------------------------------
Vendor: CompUSA, Woburn, MA
9/1/93 Inv. # 920241
  1     s/n: S43271K8D087     Apple Mac 16" Monitor                    $1,299.00   $1,299.00         0          100%    $1,299.00

Vendor: Computer City,  341 Cochituate Road, Framingham, MA 01701
9/2/93 Inv. # 056314
  1     s/n: SXC331K7CE1      Mac Centris Computer 660AV 8/500         $2,799.00   $2,799.00         0          100%    $2,799.00
  1     s/n: SLC3264X5VA3     Mac LC III 4/160                         $1,348.00   $1,348.00         0          100%    $1,348.00
  1     s/n: 08119709-3615    NEC 4FGe Monitor                           $648.98     $648.98         0          100%      $649.98
  1     s/n: 3616179KB        NEC 4FGe Monitor                           $648.98     $648.98         0          100%      $649.98
  1     s/n: JPBF090260       HP lasser Jet 4M                         $1,895.00   $1,895.00         0          100%    $1,895.00
  1     with                  Power Envelope Feeder for LaserJet 4M      $249.00     $249.00         0          100%      $249.00
  1     s/n: AP3324865M0312   Apple Extended Keyboard II                 $148.00     $148.00         0          100%      $148.00
  1     s/n: AP3326VS5M0312   Apple Extended Keyboard II                 $148.00     $148.00         0          100%      $148.00

Vendor: MacWarehouse, 1720 Oak Street, Lakewood, NY 08701
9/3/93 Inv. # 081580340
  1     Sch. 1A-FC2153MMC53    Farallon EtherMac Card for Mac IIsi       $195.95     $195.95         0          100%      $195.95
  1     Sch. 1A-FC2179VC53     Farallon EtherMac Card for Mac IIsi       $195.95     $195.95         0          100%      $195.95
  1     Sch. 4D-SG306D40VA2    Farallon EtherMac Card for Mac LCIIIw/FPU $259.00     $259.00         0          100%      $259.00
  1     above Computer City    Farallon EtherMac Card for Mac LCIIIw/FPU $259.00     $259.00         0          100%      $259.00
        LCIII 4/160 on pg 5w/
        s/n: SLC3264X5VA3
  1     Sch. 4D-F12454S3724    Farallon EtherMac Card for Mac IIci       $159.00     $159.00         0          100%      $159.00
        above Computer City    Farallon EtherMac Card for Mac IIci       $159.00     $159.00         0          100%      $159.00
        Duo Dock on pg 1 w/
        s/n: STF3031RDG09
  1     above CompD,           Farallon EtherMac SCSI for PowerBook      $299.00     $299.00         0          100%      $299.00
        PowerBook 170,4/120 w/
        s/n: T4703


                                     Page 5

<PAGE>

                                  Metasyn, Inc.
                                  Schedule E - Sale/Leaseback
                                  Exhibit A
- ---------------------------------------------------------------------------------------------------------------------------------
                                                                                               Months
Qty    Serial/Model #       Description                                Unit Cost  Total Cost     Old     Percentage   Valuation
- ---------------------------------------------------------------------------------------------------------------------------------
  1     Sch. 1A-FC23621FC53    Farallon EtherMac SCSI for Mac Classic    $289.00     $289.00         0          100%      $289.00
  1     Sch. 1A-FC2361K053     Farallon EtherMac SCSI for Mac Classic    $289.00     $289.00         0          100%      $289.00
  1     Sch. 1A-CA1484E35M     EtherPrint Plus (10Base-T)                $415.00     $415.00         0          100%      $415.00
        6000 in Laserwriter iif

Vendor: Memory Direct, 7911 Professional Circle, Huntington Beach, CA 92648
9/7/93 Inv. # 24174
  4     Sch. 4D-F12454S3724    4x8 70 ns Simm Memory Chip                $150.00     $600.00         0          100%      $600.00
                                                                                   ----------                          -----------

                                                  Total                            $97,226.39                          $96,041.39
                                                                                   -----------                         -----------
</TABLE>

                                     Page 6




<PAGE>


                               EQUIPMENT SCHEDULE
                                     8050-6F

                   to Master Lease Agreement Number 8050 Dated
                                December 21, 1992

LESSOR:  Dominion Ventures, Inc.   LESSEE:  Metasyn, Inc.
         44 Montgomery Street               71 Rogers Street
         Suite 4200                         Cambridge, MA  02142
         San Francisco, CA   94104

All terms and conditions of the above referenced Master Lease Agreement are
hereby expressly incorporated into this Equipment Schedule and made a part
hereof as if such terms and conditions were fully set forth herein. By their
execution of the Equipment Schedule the parties reaffirm all terms and
conditions of the Master Lease Agreement except as they may be modified hereby.
This Equipment Schedule shall become effective upon execution on date same is
executed by Lessor.

TOTAL EQUIPMENT COST OF THIS SCHEDULE:  $23,370.53

FUNDING EXPIRATION DATE:  June 30, 1994

RENTAL AMOUNT:  $758.14

INITIAL TERM:   36 Months

FREQUENCY:  Monthly in Advance

EQUIPMENT DESCRIPTION:  See Exhibit A Attached Hereto

ADVANCE RENTAL APPLIED:  Last Month's

COMMENCEMENT DATE:  July 1, 1994

SECURITY DEPOSIT:  $0.00

EQUIPMENT LOCATION:                         LESSEE CONTACT:

Metasyn, Inc.                               Name:  Margot MacArthur
71 Rogers Street                            Phone: (617) 499-1400
Cambridge, MA  02142

IN WITNESS WHEREOF,

DOMINION VENTURES, INC.                     METASYN, INC.


By:   /s/ M. Ellie Campbell                 By:   /s/ Randall B. Lauffer
     ---------------------------------          ------------------------------
Its:  Director of Operations                Its:  CEO
     ---------------------------------          ------------------------------
Date: 6/28/94                               Date:  5/25/94
     ---------------------------------          ------------------------------



<PAGE>

                                                                   Metasyn, Inc.
                                                                   Schedule 8H
                                                                   Exhibit A
<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
     VENDOR      INVOICE  MODEL NUMBER/ QNTY EQUIPMENT             FEATURE                             FEATURE COST      Total Cost
     NAME        P.O. NO. SERIAL NUMBER      DESCRIPTION           DESCRIPTION
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                <C>       <C>         <C> <C>                 <C>                                      <C>          <C>

S/L: METASYN, INC. 263707    2X32-60      1  8MB SIMMS                                                                      $288.40
S/L: METASYN, INC. 833484    NET0059      1  ETHERNET CONTROLLER                                                          $1,099.00
                   6000770                                                                                              
S/L: METASYN, INC. 806673    NET0410      1  COMPUTER EQUIPMENT   (3) ETHERWAVE AUI TRANSCEIVER              $327.00        $426.00
                   6000770                                                                                              
                                                                  (1) WIRING KIT PUNCH DOWN BLOCK             $99.00    
S/L: METASYN, INC. 108958    RH51287      1  SOLA POWER CONDITION                                                         $1,593.00
S/L: METASYN, INC. 10326                  1  1GBYTE SCSI 3.5" HD                                                          $1,208.00
S/L: METASYN, INC. 339054    901          1  CIRCULATOR BATH                                                              $1,418.05
S/L: METASYN, INC.           AC-PB-180C   1  POWERBOOK PC                                                                  $2,685.83
                             IC326N4E796                                                                                
S/L: METASYN, INC. 348906    09 050 256   1  WATER PURIFIER                                                               $2,062.00
S/L: METASYN, INC. 263707    04 977 13KH  1  CENTRIFUGE                                                                     $878.00
S/L: METASYN, INC. 379899    04 976 200B  1  ROTOR HEMATOCRIT                                                               $218.00
S/L: METASYN, INC. 379899    04 976 100B  1  ANGLE ROTOR                                                                    $238.00
S/L: METASYN, INC. 63980     HP 1050      1  WAVELENGTH DETECTOR                                                          $7,674.00
S/L: METASYN, INC. 118236    610  1/29    1  QUADRA COMPUTER      (1) QUADRA 610 8/230                     $1,749.00      $1,904.00
                                                                  (1) APPLE EXTENDED KEYBOARD                $155.00    
S/L: METASYN, INC. 263707    ACC1286      1  COMPUTER EQUIPMENT   (1) VST THINPACK COMPLETE                  $189.00        $991.95
                                                                  (1) POWERPORT/GOLD                         $299.95    
                                                                  (1) NOTE BOOK TRAVELER EXECUTIVE CASE      $115.00    
                                                                  (1) ETHERMAC SCSI ADAPTOR TP FOR POWERBK   $299.00    
                                                                  (1) MAC EKG 2.0                             $89.00    
S/L: METASYN, INC. 348959    PB 180-10    1  MEMORY CHIP                                                                    $422.30
S/L: METASYN, INC. 992172    NET0219      1  COMPUTER EQUIPMENT   (1) ETHERMAC LC-10T CARD                   $139.00        $264.00
                                                                  (1) HARD DISK TOOLKIT                      $125.00    
                                                                                                                         ..........
S/L: METASYN, INC.                                                                                                       $23,370.53
                                                                                                                        
GRAND TOTAL                                                                                                              $23,370.53
                                                                                                                      
</TABLE>
<PAGE>

                                  EXHIBIT A-1
                               (SCHEDULE 8050-6F)



FEATURE   FEATURE
MODEL #   S/N       FEATURE DESCRIPTION                     FEATURE COST
- -------   ---       -------------------                     ------------

NET0410             (3) ETHERWAVE AUI TRANSCEIVER              $327.00 
                                                               
NET0063             (1) WIRING KIT PUNCH DOWN BLOCK             $99.00 
                                                               
                    (1) QUADRA 610 8/230                     $1,749.00 
                    (1) APPLE EXTENDED KEYBOARD                $155.00 
ACC1286             (1) VST THINPACK COMPLETE                  $189.00 
MOD0098             (1) POWERPORT/GOLD                         $299.95 
ACC0890             (1) NOTE BOOK TRAVELER EXECUTIVE CASE      $115.00 
DRI0886             (1) ETHERMAC SCSI ADAPTOR TP FOR POWERBK   $299.00 
                    (1) MAC EKG 2.0                             $89.00 
PN592A-TP           (1) ETHERMAC LC-10T CARD                   $139.00 
                    (1) HARD DISK TOOLKIT                      $125.00 

TOTAL FEATURE COST                                           $3,585.95


<PAGE>

                               EQUIPMENT SCHEDULE
                                     8050-7G

                   to Master Lease Agreement Number 8050 Dated
                                December 21, 1992

LESSOR: Dominion Ventures, Inc.   LESSEE:  Metasyn, Inc.
        44 Montgomery Street               71 Rogers Street
        Suite 4200                         Cambridge, MA  02142
        San Francisco, CA   94104

All terms and conditions of the above referenced Master Lease Agreement are
hereby expressly incorporated into this Equipment Schedule and made a part
hereof as if such terms and conditions were fully set forth herein. By their
execution of the Equipment Schedule the parties reaffirm all terms and
conditions of the Master Lease Agreement except as they may be modified hereby.
This Equipment Schedule shall become effective upon execution on date same is
executed by Lessor.

TOTAL EQUIPMENT COST OF THIS SCHEDULE:  $65,562.63

FUNDING EXPIRATION DATE:  June 30, 1994

RENTAL AMOUNT:  $2,126.85

INITIAL TERM:   36 Months

FREQUENCY:  Monthly in Advance

EQUIPMENT DESCRIPTION:  See Exhibit A Attached Hereto

ADVANCE RENTAL APPLIED:  Last Month's

COMMENCEMENT DATE:  July 1, 1994

SECURITY DEPOSIT:  $0.00

EQUIPMENT LOCATION:                          LESSEE CONTACT:

Metasyn, Inc.                                Name:  Margot MacArthur
71 Rogers Street                             Phone: (617) 499-1400
Cambridge, MA  02142

IN WITNESS WHEREOF,

DOMINION VENTURES, INC.                      METASYN, INC.


By:   /s/ M. Ellie Campbell                  By: /s/ Randall B. Lauffer
     -------------------------------            ------------------------------
Its: Director of Operations                  Its:  CEO
     -------------------------------            -------------------------------
Date:     6/28/94                            Date:   5/25/94
     -------------------------------            -------------------------------


<PAGE>

                                  Metasyn, Inc.
                                  SCHEDULE 8050-7G
<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
      VENDOR           INVOICE  MODEL NUMBER/ QNTY  EQUIPMENT            FEATURE                        FEATURE COST   EQUIPMENT
      NAME             P.O. NO. SERIAL NUMBER       DESCRIPTION          DESCRIPTION                                   COST
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                   <C>       <C>           <C> <C>                   <C>                                 <C>          <C>

BRINKMAN INSTRUMENTS, 109568    716/A-5        1  TITRINO MODEL                                                           $9,270.00
INC.                  5001115

BRINKMAN INSTRUMENTS, 109568    702/716        1  WORKCELL                                                                $2,265.00
INC.                  5001115

                                                                                                                        ...........
BRINKMAN INSTRUMENTS,                                                                                                     $11,535.00
INC.

COLUMBUS INSTRUMENTS  940428    MODEL B        1  OPTO-VARIMEX                                                            $2,290.00
INTER.                5001117

                                                                                                                         ..........
COLUMBUS INSTRUMENTS                                                                                                      $2,290.00
INTER.

COMPUTER CITY         19062     486DX2         1  486DX2/50 PC                                                            $1,866.00
                      50-01116
COMPUTER CITY         19062     34705277X140   1  14" SVGA MONITOR                                                          $349.00
                      50-01116
COMPUTER CITY         19062     486SL          1  486SL/25C PC                                                            $2,299.00
                      50-01116  147-100-006

                                                                                                                         ..........
COMPUTER CITY                                                                                                             $4,514.00

GOULD ELECTRONICS     231146    856            1  VIEW II TO ASCII                                                          $295.00
                      5001131
GOULD ELECTRONICS     231131    40-8474-00     1  WINDOGRAF RECORDER                                                      $6,795.75
                      5001131
GOULD ELECTRONICS     231131    13-6615-50     1  TRANSDUCER AMPLIFIER                                                      $760.75
                      5001131
GOULD ELECTRONICS     231131    6600           1  BIOELECTRIC AMP                                                         $1,015.75
                      5001131


                                                                                                                         ..........
GOULD ELECTRONICS                                                                                                         $8,867.25

HEWLETT-PACKARD       1386      HPLC2D         1  CHEMSTATION SFTWARE  (1) HPLC 2D CHEMSTATION SOFTWARE       $4,150.00   $4,550.00
                      1002      US23004909
                                                                       (1) INTERFACE BOARD FOR THE PC           $400.00
HEWLETT-PACKARD       6270      HP 1050        1  QUATERNARY PUMP                                                        $14,708.00
                      1002      3245A01999
HEWLETT-PACKARD       6270      HP 1050        1  AUTOSAMPLER                                                             $7,756.00
                      1002      3141A02064

                                                                                                                        ...........
HEWLETT-PACKARD                                                                                                          $27,014.00

RAININ INSTRUMENT CO. 72020     HPXL           1  HPLC SYSTEM          (1) DRIVE MODULE                       $3,415.50  $11,342.38
                      5001114
                                                                       (1) PRESSURE MODULE 8700PSI ANALYTICAL $1,705.50
                                                                       (1) PUMP HEAD ANALYTICAL 10ML/MIN      $1,075.50
                                                                       (1) VALVE PRIME/PURGE SS STANDARD         $91.48
                                                                       (1) PRIME/PURGE VALVE BRACKET             $35.10
                                                                       (1) SS MAST                               $15.30
                                                                       (1) SAMPLE INJECTOR W/SWITCH             $616.50
                                                                       (1) INJECTION VALVE BRACKET               $67.50
                                                                       (1) DYNAMAX ABSORBANCE DETECTOR UV-C   $4,320.00

                                                                                                                        ...........
RAININ INSTRUMENT CO.                                                                                                   $11,342.38
TOTAL                                                                                                                   $65,562.63
</TABLE>

<PAGE>

                                  EXHIBIT A-1
                               (SCHEDULE 8050-7G)



FEATURE   FEATURE
MODEL #   S/N          FEATURE DESCRIPTION                       FEATURE COST
- -------   ---          -------------------                       ------------
                                                              
                                                              
G1304A    US23004909   (1) HPLC 2D CHEMSTATION SOFTWARE         $4,150.00 
                                                              
                       (1) INTERFACE BOARD FOR THE PC             $400.00 
48-00XL                (1) DRIVE MODULE                         $3,415.50 
48-010-C               (1) PRESSURE MODULE 8700PSI ANALYTICAL   $1,705.50 
02-0199                (1) PUMP HEAD ANALYTICAL 10ML/MIN        $1,075.50 
02-0199                (1) VALVE PRIME/PURGE SS STANDARD           $91.48 
48-606                 (1) PRIME/PURGE VALVE BRACKET               $35.10 
48-600                 (1) SS MAST                                 $15.30 
7725I                  (1) SAMPLE INJECTOR W/SWITCH               $616.50 
48-605                 (1) INJECTION VALVE BRACKET                 $67.50 
                       (1) DYNAMAX ABSORBANCE DETECTOR UV-C     $4,320.00 
                                                              
TOTAL FEATURE COST                                             $15,892.38


<PAGE>

                               EQUIPMENT SCHEDULE
                                    8050-8H

                  to Master Lease Agreement Number 8050 Dated
                               December 21, 1992

LESSOR:   Dominion Ventures, Inc.            LESSEE:   Metasyn, Inc.
          44 Montgomery Street                         71 Rogers Street
          Suite 4200                                   Cambridge, MA 02142
          San Francisco, CA 94104

All terms and conditions of the above referenced Master Lease Agreement are
hereby expressly incorporated into this Equipment Schedule and made a part
hereof as if such terms and conditions were fully set forth herein. By their
execution of the Equipment Schedule the parties reaffirm all terms and
conditions of the Master Lease Agreement except as they may be modified hereby.
This Equipment Schedule shall become effective upon execution on date same is
executed by Lessor.

TOTAL EQUIPMENT COST OF THIS SCHEDULE:  $17,570.00

FUNDING EXPIRATION DATE: June 30, 1994

RENTAL AMOUNT: $569.97

INITIAL TERM:  36 MONTHS

FREQUENCY: Monthly in Advance

EQUIPMENT DESCRIPTION:   See Exhibit A Attached Hereto

ADVANCE RENTAL APPLIED:  Last Month's

COMMENCEMENT DATE:  July 1, 1994

SECURITY DEPOSIT:   $0.00

EQUIPMENT LOCATION:                LESSEE CONTACT:

Metasyn, Inc.                      Name:  Margot MacArthur
71 Rogers Street                   Phone: (617) 499-1400
Cambridge, MA 02142

IN WITNESS WHEREOF,

DOMINION VENTURES, INC.           METASYN, INC.

By:  /s/ Randolph Werner           By: /s/ Randall B. Lauffer
   -----------------------------       -------------------------------

Its:     CFO                       Its:        CEO
   -----------------------------       -------------------------------

Date:     7/6/94                  
   ----------------------------



<PAGE>

                                  Metasyn, Inc.
                                  Schedule 8H
                                  Exhibit A


                             SCHEDULE 8050-8H


<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
      VENDOR           INVOICE  MODEL NUMBER/ QNTY  EQUIPMENT            FEATURE                        FEATURE COST   EQUIPMENT
      NAME             P.O. NO. SERIAL NUMBER       DESCRIPTION          DESCRIPTION                                   COST
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                   <C>       <C>           <C> <C>                   <C>                                 <C>          <C>

GOULD ELECTRONICS      232457     P23XL        1   PRESS 6600 AMPS                                                        $995.00
                       50-01131

                                                                                                                         .........
GOULD ELECTRONICS                                                                                                         $995.00

IN/US SYSTEMS, INC.    940414     2A           1    RADIO ISOTOPE                                                      $16,575.00
                       50-01108   50269
                                                                                                                        .........
IN/US SYSTEMS, INC.                                                                                                    $16,575.00

                                                                                                                       $17,570.00
</TABLE>


<PAGE>

                               EQUIPMENT SCHEDULE
                                     8050-9I
                   to Master Lease Agreement Number 8050 Dated
                                December 21, 1992

LESSOR:  Dominion Ventures, Inc.     LESSEE:  Metasyn, Inc.
         44 Montgomery Street                 71 Rogers Street
         Suite 4200                           Cambridge, MA  02142
         San Francisco, CA   94104

All terms and conditions of the above referenced Master Lease Agreement are
hereby expressly incorporated into this Equipment Schedule and made a part
hereof as if such terms and conditions were fully set forth herein. By their
execution of the Equipment Schedule the parties reaffirm all terms and
conditions of the Master Lease Agreement except as they may be modified hereby.
This Equipment Schedule shall become effective upon execution on date same is
executed by Lessor.

TOTAL EQUIPMENT COST OF THIS SCHEDULE:  $273,149.72

FUNDING EXPIRATION DATE:  May 31, 1996

RENTAL AMOUNT:  $8,768.11

INITIAL TERM:   36 Months

FREQUENCY:  Monthly in Advance

EQUIPMENT DESCRIPTION:  See Exhibit A Attached Hereto

ADVANCE RENTAL APPLIED:  Last Month's

COMMENCEMENT DATE:  October 1, 1995

SECURITY DEPOSIT:  $0.00

EQUIPMENT LOCATION:                       LESSEE CONTACT:
Metasyn, Inc.                             Name:  Margot MacArthur
71 Rogers Street                          Phone: (617) 499-1400
Cambridge, MA  02142

IN WITNESS WHEREOF,

DOMINION VENTURES, INC.                   METASYN, INC.


By:  /s/ M. Ellie Campbell                By:  /s/ Michael D. Webb
   --------------------------                -------------------------
Its:                                      Its: President & CEO
   --------------------------                -------------------------
Date:  8/25/95                            Date:    8/10/95
   -------------------------                 -------------------------


<PAGE>


                         Metasyn, Inc. Annex A (8050-91)
<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
Vendor          Invoice  Model Number/    Qnty    Equipment          Feature                          Feature         Equipment
Name             Number  Serial Number            Description        Description                      Cost            Cost
- -----------------------------------------------------------------------------------------------------------------------------------
<S>             <C>      <C>                <C>   <C>                <C>                              <C>               <C>
Metasyn (S/L)    433945  4222331             1    Modl 422 Series Sngl                                                      547.55
Metasyn (S/L)    8458    RB272718UP6         1    5.1 Sq. Ft. Rabbit Cag                                                  2,775.00
Metasyn (S/L)    34939   51S01               1    270 MB Extern Syquest                                                     659.00
                         8410202751
Metasyn (S/L)    18561   Do401018            1    Daystar Turbo  0401                                                       769.00
Metasyn (S/L)    18497   Ase34000            1    4Gig Seagate Hd                                                         2,500.00
                         K4133454
Metasyn (S/L)    950119  0360 B D 30         2    Opto Varimex mini                                                       4,780.00
                         94427-1, 94427
Metasyn (S/L)    108861  1210513             1    Power Mac  6100/66                                                      1,899.00
                         Xb50425q41a                                                                                        950.22
Metasyn (S/L)    112640  M3089ll/a           2    Appl Multiscan Monit
                         SCJ05101060539x, 6
Metasyn (S/L)    33808   302625              1    Power mac 8100/80                                                       3,895.00
Metasyn (S/L)    33808   M0312               1    Appl Extend Keyboard                                                      155.00
Metasyn (S/L)    33808   M2611lll/a          1    Appl Multi Scan Disp                                                      985.00
                         S14181zg1xx
Metasyn (S/L)    18833   6381-M50            1    IBM Valuepoint Dx                                                       1,197.00
                         1s6381m502323d
Metasyn (S/L)    18833   5001178             1    Nec Monitor                                                               349.00
                         8119756
Metasyn (S/L)    7411    0                   1    Computer Equipment Powerbook Duo 280c                 3,399.00          5,778.00
                                                                     Powerbook Merc Intern Data/Fax       310.00
                                                                     Powerbook Duo Dock II                922.00
                                                                     Appl Multiscan 17 Dsiplay            994.00
                                                                     Appldesign Keyboard                   80.00
                                                                     Appl. Desktop Bus Mouse II            73.00
Metasyn (S/L)    800019  Acpu67840           1    Appl. Power Mac 6100                                                    1,689.00
Metasyn (S/L)    433945  2540ekp             1    Autoclave 2540 Ekp                                                      4,346.00
                         9412336
Metasyn (S/L)    381377  43189               1    Anion Self Regenerat                                                      795.00
Metasyn (S/L)    379754  44094               1    ED40 Electrochem Det                                                    6,930.00
Meatsyn (S/L)    379754  44132               1    Conductivity Cell                                                         891.00
Metasyn (S/L)    375582  0                   1    Lab Equipment      GP40 Gradient Pump                11,500.00         23,865.00
                                                                     Solvent Org 4x2p                     975.00
                                                                     As3500 Autosampler                10,900.00
                                                                     As3500 Maintenance Kit               490.00
Metasyn (S/L)    8273    2150s               1    Archive 2150s TD                                                          560.00
Metasyn (S/L)    710054  1913503c            1    Mettler Toledo Anlyt                                                    1,695.00
Metasyn (S/L)    507001  9548161a            1    Recirc Water Aspirat                                                      722.00
Metasyn (S/L)    752297  1449845             1    Dyna-Mix Stirrer                                                          592.50
Metasyn (S/L)    867902  9101120V            1    Circulator MDL                                                          1,595.00
Metasyn (S/L)    749300  13872               1    carver 12 Ton Press                                                     1,150.00
Metasyn (S/L)    458064  xl300               1    Di Topload Balance                                                        985.00
Metasyn (S/L)    439403  1363525             1    Accumet 25 Ise Meter                                                      925.00
Metasyn (S/L)    244240  3911                2    11cf Wide Rng  Incuba                                                  15,980.00
Metasyn (S/L)    15162   0                   1    Lab Equipment      1050 Quarternary Pump             11,760.00         25,348.00
                                                                     1050 Program Autosampler           7,496.00
                                                                     1050 Var Wavelength Detect         4,592.00
                                                                     Add Lc Instrument Control Module   1,500.00
Metasyn (S/L)    502895  0                   1    Lab Equipment      1050 Series Diode Array detector  13,100.00         16,500.00
                                                                     Stainless Steel Flow  Cell           750.00
                                                                     Hplc 2D Sngl Instrument              515.00
                                                                     Hplc 3D Sngl Instrument              515.00
                                                                     Add LC Instrument Control          1,500.00
                                                                     Universal Remote Cable               120.00
Metasyn (S/L)    4050    M 250 Type          4    Temp Controller                                                         3,814.04
Metasyn (S/L)    76368   13388               1    Quant 1080MB Mac HD                                                       749.00
                         206776



<PAGE>

                                  Metasyn, Inc.
                                  Schedule 8H
                                  Exhibit A

- -----------------------------------------------------------------------------------------------------------------------------------
Vendor          Invoice  Model Number/    Qnty    Equipment          Feature                                  Feature     Equipment
Name             Number  Serial Number            Description        Description                              Cost        Cost
- -----------------------------------------------------------------------------------------------------------------------------------

METASYN (S/L)   224616   25450               2    FLAMMBLE SAFE CABINE                                                    $1,082.00
METASYN (S/L)   600012   ACPU67840           3    POWER MAC 6100                                                          $5,067.00
METASYN (S/L)   50715    0                   1    COMPUTER EQUIPMENT    POWER MAC 6100                        $1,799.00   $3,548.00
                                                                        17' APPL COLOR MONITOR                  $999.00
                                                                        (2) APPL DESIGN KEYBOARD                $150.00
                                                                        (4) 4MB SIMMS                           $600.00
METASYN (S/L)   40704    2HX36-70            2    8MB INTERLEAVED HODU                                                      $658.00
METASYN (S/L)   2174     0                   1    COMPUTER EQUIPMENT    2 GB SYS DISK 19" MONITOR            $24,705.73  $72,238.41
                                                                        4MM INTERN DIGIT AUDIO SCSI TAPE      $1,474.97
                                                                        INTERN DUAL SPEED CD ROM SCSI           $733.80
                                                                        QUANTA PROTEIN MODEL SGI             $11,364.15
                                                                        QUANTA SGI                           $12,352.34
                                                                        CHARM SGI                             $5,187.98
                                                                        STEREO VIEW EYEWEAR                   $1,102.54
                                                                        QSR SGI                               $9,881.70
                                                                        SMALL MOLECULE PRO                    $5,485.20
METASYN (S/L)   5852     0                   4    LAB EQUIPMENT         MTP MODEL 1810 CAGE                  $23,750.00  $29,525.00
                         1
                                                                        STAINLESS STEEL TREATMENT COMPONENTS  $2,070.00
                                                                        PAN RACK                              $1,075.00
                                                                        RACK FOR RAT BOX CAGES                $1,255.00
                                                                        TRANSFER CART                         $1,375.00
METASYN (S/L)   21223    0                   1    LAB FURNITURE         (2) STEELCASE LATERAL FILE            $1,064.70   $2,756.30
                                                                        STEELCASE PEDESTAL DESK                 $740.40
                                                                        STEELCASE DESK RETURN                   $451.20
                                                                        (2) LATERAL FILE FORMICA TOP            $500.00
METASYN (S/L)   12855    0                   1    LAB FURNITURE         STEELCASE LATERAL FILE CAB              $550.80   $1,216.80
                                                                        STEELCASE LATERAL FILE CAB              $666.00
METASYN (S/L)   2014     7HDD-10 M700X       1    GAST COMPRESSOR                                                           $998.00
METASYN (S/L)   127157   0                   1    LAB EQUIPMENT         DYNAMAX SD-200 PUMP                   $3,415.50   $5,017.50
                                                                        PUMP HEAD KIT                         $1,075.50
                                                                        RAININ MICROBORE MIXER                   $526.50
METASYN (S/L)   73217    81-400              1    MIXER                                                                     $650.00
METASYN (S/L)   397033   0                   1    COMPUTER EQUIPMENT    (2) POWER MAC 8100                    $1,082.00   $1,168.40
                                                                        (4) POWER MAC 9100                       $86.40
METASYN (S/L)   2790     54970-535           1    VACUUM PUMP 1.5L                                                        $1,650.00
METASYN (S/L)   110709   0                   1    LAB EQUIPMENT         VAPOR PRESSURE OSMOMETER              $4,195.00   $4,345.00
                                                                        RANGE MULTIPLIER SWITCH                 $100.00
                                                                        PROCESS HOLD SWITCH                      $50.00
METASYN (S/L)   307210   GFU21M4             1    GIBSON FREEZER                                                            $519.00
METASYN (S/L)            737/3               1    COULOMETER                                                              $6,080.00
METASYN (S/L)                                1    MODEM                                                                     $260.00

                                                                                                                       ............

METASYN (S/L)                                                                                                           $273,149.72

GRANT TOTAL                                                                                                             $273,149.72
</TABLE>

<PAGE>

                    CERTIFICATE OF INSPECTION AND ACCEPTANCE


This document is the "Acceptance Certificate" referred to in section 4 of the
Master Lease Agreement Number 8050 (the "Lease") dated as of December 21, 1992
between Dominion Ventures, Inc., ("Lessor") and Metasyn, Inc. ("Lessee"). This
"Acceptance Certificate" relates to the equipment described in Equipment
Schedule 8050-9I, (the "Equipment").

Lessee has not relied upon and acknowledges that Lessor has made no
representation or warranty of any kind, express or implied, with respect to the
Equipment, including without limitation its condition, merchantability or
fitness for any particular purpose. Lessee further acknowledges that Lessor has
accepted no responsibility for the transportation, installation or required
licensing necessary for the transfer, installation or use of the equipment.

Lessee certifies that the Equipment has been delivered to Lessee, has been
inspected by Lessee and has been found to be in good order and to satisfy the
specifications required by the Lease.

Lessee hereby represents and warrants to Lessor that (i) no event of default
under Section 25 of the Lease or event which, with the giving of notice or the
lapse of time, or both, would become such an event of default has occurred and
is continuing, except as disclosed in writing to Lessor, which disclosed event
has either been cured by Lessee or concerning which Lessee has provided evidence
to Lessor that Lessee is in the process of curing such default and is diligently
prosecuting such cure to completion (nothing herein shall constitute a waiver by
Lessor of any rights or remedies which it may have under the Lease with respect
to any event of default); and (ii) Lessee has obtained, and there are in full
force and effect, any insurance policies with respect to the Accepted Equipment
required to be obtained under the terms of the Lease.


                                             METASYN, INC.



Date:       8/10/95                          By: /s/ Michael D. Webb
      ------------------------                 -------------------------
                                             Title: President & CEO
                                               -------------------------


<PAGE>





                                  BILL OF SALE


Metasyn, Inc., ("Seller"), for good and valuable consideration, does hereby
grant, bargain, sell, transfer and set over unto Dominion Ventures, Inc.,
("Buyer"), its successors, assigns, including any partnership, and the partners
therein (general and limited), the following:

Number        Part Number          Description                 Total Cost

         See Attached Equipment List Exhibit A                 $273,149.72

TO HAVE AND TO HOLD the Equipment to the Buyer, its successors and assigns, for
its and their own use and behalf forever.

And Seller hereby represents and warrants to Buyer, its successor and assigns,
that as of the date hereof:

1.   Seller has legal title to each item of Equipment and good and lawful right
     to sell such item of equipment.

2.   No item of Equipment is subject to any lien or encumbrance of any nature.

3.   Each item of Equipment is in good repair, condition and working order, in
     accordance with accepted industry practices.

4.   Each item of Equipment has been used predominantly in the United States.

5.   No item of Equipment has been leased or sublet to any governmental agency
     or tax exempt organization.

Seller covenants that it will warrant and defend such title against all claims
and demands whatsoever.

IN WITNESS WHEREOF, Seller has caused this instrument to be duly executed in its
name by its officers thereunto duly authorized this 10th day of August, 1995.


                                          METASYN, INC.


                                          By: /s/ Michael D. Webb
                                             -------------------------
                                          Title: President & CEO
                                             -------------------------




<PAGE>


                                  Metasyn, Inc.
                                  Annex A
                                  SCHEDULE 8050-I9

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
Vendor          Invoice  Model Number/    Qnty    Equipment          Feature                                  Feature     Equipment
Name             Number  Serial Number            Description        Description                              Cost        Cost
- -----------------------------------------------------------------------------------------------------------------------------------
<S>             <C>      <C>                <C>   <C>                <C>                                    <C>           <C>

METASYN (S/L)    224616  25450              2     FLAMMBLE SAFE CABINE                                                     $1,082.00
METASYN (S/L)    600012  ACPU67840          3     POWER MAC 6100                                                          $5,067.00
METASYN (S/L)    50715   0                  1     COMPUTER EQUIPMENT   POWER MAC 6100                         $1,799.00   $3,548.00
                                                                       17' APPL COLOR MONITOR                   $999.00
                                                                       (2) APPL DESIGN KEYBOARD                 $150.00
                                                                       (4) 4MB SIMMS                            $600.00
METASYN (S/L)    40704   2HX36-70           2     8MB INTERLEAVED HODU                                                      $658.00
METASYN (S/L)    2174    0                  1     COMPUTER EQUIPMENT   2 GB SYS DISK 19" MONITOR             $24,705.73  $72,238.41
                                                                       4MM INTERN DIGIT AUDIO SCSI TAPE       $1,474.97
                                                                       INTERN DUAL SPEED CD ROM SCSI            $733.80
                                                                       QUANTA PROTEIN MODEL SGI              $11,364.15
                                                                       QUANTA SGI                            $12,352.34
                                                                       CHARM SGI                              $5,187.98
                                                                       STEREO VIEW EYEWEAR                    $1,102.54
                                                                       QSR SGI                                $9,881.70
                                                                       SMALL MOLECULE PRO                     $5,485.20
METASYN (S/L)    5852    0                  4     LAB EQUIPMENT        MTP MODEL 1810 CAGE                   $23,750.00  $29,525.00
                         1
                                                                       STAINLESS STEEL TREATMENT COMPONENTS   $2,070.00
                                                                       PAN RACK                               $1,075.00
                                                                       RACK FOR RAT BOX CAGES                 $1,255.00
                                                                       TRANSFER CART                          $1,375.00
METASYN (S/L)    21223   0                  1     LAB FURNITURE        (2) STEELCASE FILE                     $1,064.70   $2,756.30
                                                                       STEELCASE PEDESTAL DESK                  $740.40
                                                                       STEELCASE DESK RETURN                    $451.20
                                                                       (2) LATERAL FILE FORMICA TOP             $500.00
METASYN (S/L)    12855   0                  1     LAB FURNITURE        STEELCASE LATERAL FILE CAB               $550.80   $1,216.80
                                                                       STEELCASE LATERAL FILE CAB               $666.00
METASYN (S/L)    2014    7HDD-10 M700X      1     GAST COMPRESSOR                                                           $998.00
METASYN (S/L)    127157  0                  1     LAB EQUIPMENT        DYNAMAX SD-200 PUMP                    $3,415.50   $5,017.50
                                                                       PUMP HEAD KIT                          $1,075.50
                                                                       RAININ MICRBORE MIXER                    $526.50
METASYN (S/L)    73217   81-400             1     MIXER                                                                     $650.00
METASYN (S/L)    397033  0                  1     COMPUTER EQUIPMENT   (2) POWER MAC 8100                     $1,082.00   $1,168.40
                                                                       (4) POWER MAC 9100                        $86.40
METASYN (S/L)    2790    54970-535          1     VACUUM PUMP 1.5L                                                        $1,650.00
METASYN (S/L)    110709  0                  1     LAB EQUIPMENT        VAPOR PRESSURE OSMOMETER               $4,195.00   $4,345.00
                                                                       RANGE MULTIPLIER SWITCH                  $100.00
                                                                       PROCESS HOLD SWITCH                       $50.00
METASYN (S/L)    307210  GFU21M4            1     GIBSON FREEZER                                                            $519.00
METASYN (S/L)            737/3              1     COULOMETER                                                              $6,080.00
METASYN (S/L)                               1     MODEM                                                                     $260.00

                                                                                                                        ...........

METASYN (S/L)                                                                                                           $273,149.72

GRAND TOTAL                                                                                                             $273,149.72

</TABLE>
<PAGE>

                         Metasyn, Inc. Annex A (8050-91)

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
Vendor        Invoice  Model Number/    Qnty    Equipment          Feature                                  Feature     Equipment
Name           Number  Serial Number            Description        Description                              Cost        Cost
- -----------------------------------------------------------------------------------------------------------------------------------
<S>            <C>      <C>             <C>   <C>                <C>                                    <C>           <C>
Metasyn (S/L)  433945   4222331          1    Modl 422 Series Sngl                                                        547.55
Metasyn (S/L)  8458     RB272718UP6      1    5.1 Sq. Ft. Rabbit Cag                                                    2,775.00
Metasyn (S/L)  34939    51S01            1    270 MB Extern Syquest                                                       659.00
                        8410202751
Metasyn (S/L)  18561    Do401018         1    Daystar Turbo  0401                                                         769.00
Metasyn (S/L)  18497    Ase34000         1    4Gig Seagate HD                                                           2,500.00
                        K4133454
Metasyn (S/L)  950119   0360 B D 30      2    Opto Varimex mini                                                         4,780.00
                        94427-1, 94427
Metasyn (S/L)  108861   1210513          1    Power Mac  6100/66                                                        1,899.00
                        Xb50425q41a                                                                                       950.22
Metasyn (S/L)  112640   M3089ll/a        2    Appl Multiscan Monit
                        Sc05101060539x, 6
Metasyn (S/L)  33808    302625           1    Power man 8100/80                                                         3,895.00
Metasyn (S/L)  33808    M0312            1    Appl Extend Keyboard                                                        155.00
Metasyn (S/L)  33808    M2611lll/a       1    Appl Multi Scan Disp                                                        985.00
                        S14181zg1xx
Metasyn (S/L)  18833    6381-M50         1    IBM Valuepoint Dx                                                         1,197.00
                        1s6381m502323d
Metasyn (S/L)  18833    5001178          1    NEC Monitor                                                                 349.00
                        8119756
Metasyn (S/L)  7411     0                1    Computer Equipment    Powerbook Duo 280c                  3,399.00
                                                                    Powerbook Merc Intern Data/Fax        310.00
                                                                    Powerbook Duo Dock II                 922.00
                                                                    Appl Multiscan 17 Dsiplay             994.00
                                                                    Appldesign Keyboard                    80.00
                                                                    Appl. Desktop Bus Mouse II             73.00
Metasyn (S/L)  800019   Acpu67840        1    Appl. Power Mac 6100                                                      1,689.00
Metasyn (S/L)  433945   2540ekp          1    Autoclave 2540 Ekp                                                        4,346.00
                        9412336
Metasyn (S/L)  381377   43189            1    Anion Self Regenerat                                                        795.00
Metasyn (S/L)  379754   44094            1    Ed40 Electrochem Det                                                      6,930.00
Meatsyn (S/L)  379754   44132            1    Conductivity Cell                                                           891.00
Metasyn (S/L)  375582   0                1    Lab Equipment         Gp40 Gradient Pump                11,500.00        23,865.00
                                                                    Solvent Org 4x2p                     975.00
                                                                    As3500 Autosampler                10,900.00
                                                                    As3500 Maintenance Kit               490.00
Metasyn (S/L)  8273     2150s            1    Archive 2150s TD                                                            560.00
Metasyn (S/L)  710054   1913503c         1    Mettler Toledo Anlyt                                                      1,695.00
Metasyn (S/L)  507001   9548161a         1    Recirc Water Aspirat                                                        722.00
Metasyn (S/L)  752297   1449845          1    Dyna-Mix Stirrer                                                            592.50
Metasyn (S/L)  867902   9101120V         1    Circulator MDL                                                            1,595.00
Metasyn (S/L)  749300   13872            1    carver 12 Ton Press                                                       1,150.00
Metasyn (S/L)  458064   xl300            1    Di Topload Balance                                                          985.00
Metasyn (S/L)  439403   1363525          1    Accumet 25 Ise Meter                                                        925.00
Metasyn (S/L)  244240   3911             2    11cf Wide Rng  Incuba                                                    15,980.00
Metasyn (S/L)  15162    0                1    Lab Equipment         1050 Quarternary Pump             11,760.00        25,348.00
                                                                    1050 Program Autosampler           7,496.00
                                                                    1050 Var Wavelength Detect         4,592.00
                                                                    Add Lc Instrument Control Module   1,500.00
Metasyn (S/L)  502895   0                1    Lab Equipment         1050 Series Diode Array detector  13,100.00        16,500.00
                                                                    Stainless Steel Flow  Cell           750.00
                                                                    Hplc 2D Sngl Instrument              515.00
                                                                    Hplc 3D Sngl Instrument              515.00
                                                                    Add LC Instrument Control          1,500.00
                                                                    Universal Remote Cable               120.00
Metasyn (S/L)  4058     M 250 Type       4    Temp Controller                                                           3,814.04
Metasyn (S/L)  76368    13388            1    Quant 1080MB Mac Hd                                                         749.00
                        206776

</TABLE>


<PAGE>

                               EQUIPMENT SCHEDULE
                                     8050-10
                   to Master Lease Agreement Number 8050 Dated
                                December 21, 1992

LESSOR: Dominion Ventures, Inc.     LESSEE:  Metasyn, Inc.
        44 Montgomery Street                 71 Rogers Street
        Suite 4200                           Cambridge, MA  02142
        San Francisco, CA   94104

All terms and conditions of the above referenced Master Lease Agreement are
hereby expressly incorporated into this Equipment Schedule and made a part
hereof as if such terms and conditions were fully set forth herein. By their
execution of the Equipment Schedule the parties reaffirm all terms and
conditions of the Master Lease Agreement except as they may be modified hereby.
This Equipment Schedule shall become effective upon execution on date same is
executed by Lessor.

TOTAL EQUIPMENT COST OF THIS SCHEDULE:  $158,217.47

FUNDING EXPIRATION DATE:  May 31, 1996

RENTAL AMOUNT:  $5,078.78

INITIAL TERM:   36 Months

FREQUENCY:  Monthly in Advance

EQUIPMENT DESCRIPTION:  See Exhibit A Attached Hereto

ADVANCE RENTAL APPLIED:  Last Month's

COMMENCEMENT DATE:  October 1, 1995

SECURITY DEPOSIT:  $0.00

EQUIPMENT LOCATION:                          LESSEE CONTACT:
Metasyn, Inc.                                Name:  Margot MacArthur
71 Rogers Street                             Phone: (617) 499-1400
Cambridge, MA  02142

IN WITNESS WHEREOF,

DOMINION VENTURES, INC.                      METASYN, INC.


By: /s/ M. Ellie Campbell                    By:  /s/ M.D. Webb
   ------------------------------               ------------------------------
Its: Director of Operations                  Its: President & CEO
   ------------------------------               ------------------------------
Date: 10/5/95                                Date: 9/28/95
   ------------------------------               ------------------------------



<PAGE>







                       METASYN, INC. EXHIBIT A (8050-010)

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
VENDOR        INVOICE  MODEL NUMBER/    QNTY    EQUIPMENT          FEATURE                              FEATURE     EQUIPMENT
NAME           NUMBER  SERIAL NUMBER            DESCRIPTION        DESCRIPTION                          COST        COST
- -----------------------------------------------------------------------------------------------------------------------------------
<S>            <C>      <C>             <C>   <C>                <C>                                    <C>           <C>
METASYN (S/L)  729427   1363550          1   PH/ION COND MTR                                                            1,400.00
METASYN (S/L)  729428                    1   LAB EQUIPMENT         VACUUM OVEN 120V                     1,587.06       11,953.77
                                                                   REFRIG FLAM MDL 813 120V             1,312.20
                                                                   BAL EL PM400                         1,729.84
                                                                   BAL EL PM400                         1,694.89
                                                                   (2) ROTOVAPOR 24/40                  5,629.78
METASYN (S/L)  801283                    1   LAB EQUIPMENT         UV CABINET LW/SW COMP                  566.67        8,784.75
                                                                   (2) BUCHI VACOBOX B171               8,218.08
METASYN (S/L)  777026   011154           1   WELCH DIR. DD-PUMP                                                           859.00
METASYN (S/L)  787541                    1   LAB EQUIPMENT         MICROSCOPE STANDARD 25               1,243.35        2,638.15
                                                                   OPTICS PKG-A PLANS-GEN               1,102.00
                                                                   CONDSO.9ZBRIFLD                        292.80
METASYN (S/L)  729427   0540022          4   HEIDOLPH STIRR MODEL                                                       4,082.12
METASYN (S/L)  806275                    1   LAB EQUIPMENT         PUMP MDL  D-150                      1,235.00        2,835.00
                                                                   (2) PUMP MDL D-25                    1,600.00
METASYN (S/L)  4203     210/T-T-S        2   MDL 210/T-T SYSTEM                                                         1,988.00
METASYN (S/L)  40783    70               4   8MB SIMMS 2X36                                                             1,316.00
METASYN (S/L)  26956                     1   LAB EQUIPMENT         (2) KEWAUNEE FUME HOOD SUPERSTAR    14,380.20       26,518.20
                                                                   DISTILLATION HOOD                   12,138.00
METASYN (S/L)  517846   23M62L           3   5' CREDENZA                                                                1,571.70
METASYN (S/L)  115398                    1   COMPUTER EQUIPMENT    (3) POWERMAS 6100/66                 5,697.00        7,122.33
                                                                   (3) 15" APPLE COLOR MONITOR          1,425.33
METASYN (S/L)  547984                    1   LAB EQUIPMENT         HP 1050 QUART PUMP                  11,760.00       33,545.60
                                                                   HP 105 PROGRAMMABLE AUTOSAMPLER      7,496.00
                                                                   HP 1050 VARIABLE WAVELENGTH DETECT   4,592.00
                                                                   ODS, 100 X 4.6, 5U                     197.60
                                                                   SINGLE INSTRUMENT LC 2D CHEMSTATION  9,500.00
METASYN (S/L)  554082                    1   LAB EQUIPMENT         HP 6890 GAS CHROMATOGRAPH            8,130.00       16,700.00
                                                                   CAPILLARY  S/S1 INLET W/EPC          2,770.00
                                                                   FLAME IONIZATION DETECTOR            2,770.00
                                                                   INET INTERFACT FOR HP INTEGRATORS      535.00
                                                                   HP 6890 SERIES INTEGRATOR            2,495.00
METASYN (S/L)  251234   25450            1   FLAMMABLE CABINET                                                            510.20
METASYN (S/L)  610509   617189           1   HELIOS DRY LASER IMG                                                      35,824.00
METASYN (S/L)  41001    MAXTS303DB       1   3 BANK TECHLINE ILLU                                                         568.65
                                                                                                                      ----------
METASYN (S/L)                                                                                                         158,217.47

GRAND TOTAL                                                                                                           158,217.47

</TABLE>

<PAGE>


                               EQUIPMENT SCHEDULE
                                     8050-11
                   to Master Lease Agreement Number 8050 Dated
                                December 21, 1992

LESSOR: Dominion Ventures, Inc.     LESSEE:  Metasyn, Inc.
        44 Montgomery Street                 71 Rogers Street
        Suite 4200                           Cambridge, MA  02142
        San Francisco, CA   94104

All terms and conditions of the above referenced Master Lease Agreement are
hereby expressly incorporated into this Equipment Schedule and made a part
hereof as if such terms and conditions were fully set forth herein. By their
execution of the Equipment Schedule the parties reaffirm all terms and
conditions of the Master Lease Agreement except as they may be modified hereby.
This Equipment Schedule shall become effective upon execution on date same is
executed by Lessor.

TOTAL EQUIPMENT COST OF THIS SCHEDULE:  $82,878.29

FUNDING EXPIRATION DATE:  May 31, 1996

RENTAL AMOUNT:  $2,660.39

INITIAL TERM:   36 Months

FREQUENCY:  Monthly in Advance

EQUIPMENT DESCRIPTION:  See Exhibit A Attached Hereto

ADVANCE RENTAL APPLIED:  Last Month's

COMMENCEMENT DATE:  January 1,1996

SECURITY DEPOSIT:  $0.00

EQUIPMENT LOCATION:                      LESSEE CONTACT:
Metasyn, Inc.                            Name:  Margot MacArthur
71 Rogers Street                         Phone: (617) 499-1400
Cambridge, MA  02142

IN WITNESS WHEREOF,

DOMINION VENTURES, INC.                  METASYN, INC.


By:  /s/ M. Ellie Campbell               By:  /s/ Michael D. Webb
   -----------------------------            -------------------------------
Its: Director of Operations              Its: President & CEO
   -----------------------------            -------------------------------
Date:     11/15/95                       Date:     11/7/95
   -----------------------------            -------------------------------



<PAGE>





                         Metasyn, Inc. Annex A (8050-11)



<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
Vendor             Invoice Model Number/    Qnty    Equipment          Feature                              Feature     Equipment
Name               Number  Serial Number            Description        Description                          Cost        Cost
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                <C>      <C>             <C>   <C>                <C>                                    <C>           <C>
Brinkman 
Instruments, Inc.           20-92-892-1      1    Generator Electrode                                                        505.00
                                                                                                                             ------
Brinkman 
Instruments, Inc.                                                                                                            505.00


Fisher Scientific  877395   0509072V         1    Microcent Compact                                                          497.00
Fisher Scientific  876014   0509012          1    Compac Rotor W/Seal                                                         53.50
                                                                                                                             ------

Fisher Scientific                                                                                                            550.50

Mac Warehouse      60691    Net0299          1    Ether 10-T Starlet 8                                                       149.00
Mac Warehouse      44620    Lot              1    Computer Equipment   Power Mac 7200/90                      1,825.00     6,173.00
                                                                       Power Mac 6100/66                      2,200.00
                                                                       Apple Multiple Scan 17"                  975.00
                                                                       Apple Multiple Scan 15"                  465.00
                                                                       (2) Apple Design keyboard                158.00
                                                                       16MB Dimm                                550.00     --------
Mac Warehouse                                                                                                              6,322.00

Metasyn (S/L)      10562    Lot                   Computer Equipment   Power Mac AV Card                        500.00     1,400.00
                                                                       Radius Spigot Power AV                   900.00
Metasyn (S/L)      232562   Lot                   Lab Equipment        Pump, Vac, Sngl 115V                     575.00       646.25
                                                                       Serv Kit                                  71.25
Metasyn (S/L)      810315   13  265  5       1    Refrig Circ Micro                                                        2,485.00
Metasyn (S/L)      816894   Lot                   Lab Equipment        Glassware Washer  4Bskt               14,775.00    17,878.00
                                                                       Final Rinse Tank Polyethelene            384.75
                                                                       (4) Universal Manifold Spin Head       1,840.00
                                                                       (2) Bskt Open Sides 8in                  192.00
                                                                       (3) Spindles 6in                         247.50
                                                                       (3) Spindles 12in                        258.75
                                                                       (2) Spindles 18in                        180.00
Metasyn(S/L)                Lot                   Lab Equipment        Final Rinse Pump                         523.25       842.45
                                                                       (2) Cover For Bskt                        79.20
                                                                       Vial Basket                              240.00
Metasyn (S/L)      800836   12  070  24      1    Binoc Phototube                                                            767.00
Metasyn (S/L)      841920   12  00  135      1    TV Adapt C-MNT/Photu                                                       550.00
Metasyn (S/L)      556429   Lot                   Lab Equipment        1050 Quarternary Pump                 11,760.00    34,273.60
                                                                       1050 Programmable Autosampler          7,496.00
                                                                       1050 Variable Wavelength Detector      4,592.00
                                                                       Stainless Steel Flow Cell, 8mm           728.00
                                                                       ODS, 100 x 4.6, 5U                       197.60
                                                                       Sngl Instruc LC 2D Chemstation         9,500.00
Metasyn (S/L)      831714   Lot                   Computer Equipment   Multi Scan 15" Display                   479.00     3,002.99
                                                                       Apple Design Keyboard                     84.99
                                                                       (2) Simm 8MB 8ONS 72 Pin                 560.00
                                                                       Power Mac 6100/66                      1,879.00    ---------
  Metasyn (S/L)                                                                                                           61,845.29


Rainin Instrumnt C 173876   Lot              1    Lab Equipment        HPLC Autoinjector                     11,155.50    13,655.50
                                                                       HPLC Method Manager                    2,500.00
                                                                                                                         ----------
Rainin Instrumnt                                                                                                          13,655.50

GRAND TOTAL                                                                                                               82,878.29

</TABLE>

<PAGE>


                    CERTIFICATE OF INSPECTION AND ACCEPTANCE


This document is the "Acceptance Certificate" referred to in section 4 of the
Master Lease Agreement Number 8050 (the "Lease") dated as of December 21, 1992
between Dominion Ventures, Inc., ("Lessor") and Metasyn, Inc. ("Lessee"). This 
"Acceptance Certificate" relates to the equipment described in Equipment 
Schedule 8050-11, (the "Equipment").

Lessee has not relied upon and acknowledges that Lessor has made no
representation or warranty of any kind, express or implied, with respect to the
Equipment, including without limitation its condition, merchantability or
fitness for any particular purpose. Lessee further acknowledges that Lessor has
accepted no responsibility for the transportation, installation or required
licensing necessary for the transfer, installation or use of the equipment.

Lessee certifies that the Equipment has been delivered to Lessee, has been
inspected by Lessee and has been found to be in good order and to satisfy the
specifications required by the Lease.

Lessee hereby represents and warrants to Lessor that (i) no event of default
under Section 24 of the Lease or event which, with the giving of notice or the
lapse of time, or both, would become such an event of default has occurred and
is continuing, except as disclosed in writing to Lessor, which disclosed event
has either been cured by Lessee or concerning which Lessee has provided evidence
to Lessor that Lessee is in the process of curing such default and is diligently
prosecuting such cure to completion (nothing herein shall constitute a waiver by
Lessor of any rights or remedies which it may have under the Lease with respect
to any event of default); and (ii) Lessee has obtained, and there are in full
force and effect, any insurance policies with respect to the Accepted Equipment
required to be obtained under the terms of the Lease.


                                       METASYN, INC.



Date:     11/7/95                      By: /s/ Michael D. Webb
     ----------------------------         -----------------------------
                                       Title: President & CEO
                                          ----------------------------


<PAGE>



                               EQUIPMENT SCHEDULE
                                     8050-12
                   to Master Lease Agreement Number 8050 Dated
                                December 21, 1992

LESSOR: Dominion Ventures, Inc.     LESSEE:  Metasyn, Inc.
        44 Montgomery Street                 71 Rogers Street
        Suite 4200                           Cambridge, MA  02142
        San Francisco, CA   94104

All terms and conditions of the above referenced Master Lease Agreement are
hereby expressly incorporated into this Equipment Schedule and made a part
hereof as if such terms and conditions were fully set forth herein. By their
execution of the Equipment Schedule the parties reaffirm all terms and
conditions of the Master Lease Agreement except as they may be modified hereby.
This Equipment Schedule shall become effective upon execution on date same is
executed by Lessor.

TOTAL EQUIPMENT COST OF THIS SCHEDULE:  $4,308.28

FUNDING EXPIRATION DATE:  May 31, 1996

RENTAL AMOUNT:  $138.30

INITIAL TERM:   36 Months

FREQUENCY:  Monthly in Advance

EQUIPMENT DESCRIPTION:  See Exhibit A Attached Hereto

ADVANCE RENTAL APPLIED:  Last Month's

COMMENCEMENT DATE:  April 1,1996

SECURITY DEPOSIT:  $0.00

EQUIPMENT LOCATION:                       LESSEE CONTACT:
Metasyn, Inc.                             Name:  Margot MacArthur
71 Rogers Street                          Phone: (617) 499-1400
Cambridge, MA  02142

IN WITNESS WHEREOF,

DOMINION VENTURES, INC.                   METASYN, INC.


By:    /s/  M. Ellie Campbell             By:  /s/ M.D. Webb
     -----------------------------           -------------------------------
Its:   Director of Operations             Its: President and CEO
     -----------------------------           -------------------------------
Date:        1/31/96                                   
     -----------------------------           -------------------------------



<PAGE>


                         Metasyn, Inc. Annex A (8050-12)




<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
Vendor             P.O.    Model Number/    Qnty    Equipment          Feature                              Feature     Equipment
Name               Number  Serial Number            Description        Description                          Cost        Cost
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                <C>      <C>             <C>   <C>                <C>                                    <C>           <C>
Carl Zeiss, Inc.   960060                         Computer Equipment  PVM-1353MD Color Video Monitor         1,292.28    3,158.28
                                                                      CCD Colr Rgb Cmra                      1,100.00
                                                                      P. Supply F. TK1070U                     185.00
                                                                      JVC Rgb Cable                            114.00
                                                                      Connect tube .5x                         467.00
Carl Zeiss, Inc.                                                                                                         3,158.28
                                                                                                                         --------

Cole-Parmer        243355    H-07056-25      2    Pump Vac Sngl 115V                                                     1,150.00
                                                                                                                        ---------
Cole Palmer                                                                                                              1,150.00

Grand  Total                                                                                                             4,308.28

</TABLE>


<PAGE>



                               EQUIPMENT SCHEDULE
                                     8050-13
                   to Master Lease Agreement Number 8050 Dated
                                December 21, 1992

LESSOR: Dominion Ventures, Inc.     LESSEE:  Metasyn, Inc.
        44 Montgomery Street                 71 Rogers Street
        Suite 4200                           Cambridge, MA  02142
        San Francisco, CA   94104

All terms and conditions of the above referenced Master Lease Agreement are
hereby expressly incorporated into this Equipment Schedule and made a part
hereof as if such terms and conditions were fully set forth herein. By their
execution of the Equipment Schedule the parties reaffirm all terms and
conditions of the Master Lease Agreement except as they may be modified hereby.
This Equipment Schedule shall become effective upon execution on date same is
executed by Lessor.

TOTAL EQUIPMENT COST OF THIS SCHEDULE:  $24,955.75  /s/ MDW Metasyn
                                                  -------
                                                    /s/ MEC DVI
                                                  -------
FUNDING EXPIRATION DATE:  May 31, 1996

RENTAL AMOUNT:  $801.08   /s/  MDW  Metasyn
                       --------
                          /s/  MEC  DVI
                       --------
INITIAL TERM:   36 Months

FREQUENCY:  Monthly in Advance

EQUIPMENT DESCRIPTION:  See Exhibit A Attached Hereto

ADVANCE RENTAL APPLIED:  Last Month's

COMMENCEMENT DATE:  April 1,1996

SECURITY DEPOSIT:  $0.00

EQUIPMENT LOCATION:                              LESSEE CONTACT:
Metasyn, Inc.                                    Name:  Margot MacArthur
71 Rogers Street                                 Phone: (617) 499-1400
Cambridge, MA  02142

IN WITNESS WHEREOF,

DOMINION VENTURES, INC.                        METASYN, INC.


By:   /s/  M. Ellie Campbell                   By:  /s/  M.B. Webb
     ------------------------------               -----------------------------
Its: Director of Operations                    Its: President & CEO
     ------------------------------               -----------------------------
Date: 4/10/96                                       4/9/96
     ------------------------------               -----------------------------



<PAGE>



                               EQUIPMENT SCHEDULE
                                     8050-13
                   to Master Lease Agreement Number 8050 Dated
                                December 21, 1992

LESSOR: Dominion Ventures, Inc.     LESSEE:  Metasyn, Inc.
        44 Montgomery Street                 71 Rogers Street
        Suite 4200                           Cambridge, MA  02142
        San Francisco, CA   94104

All terms and conditions of the above referenced Master Lease Agreement are
hereby expressly incorporated into this Equipment Schedule and made a part
hereof as if such terms and conditions were fully set forth herein. By their
execution of the Equipment Schedule the parties reaffirm all terms and
conditions of the Master Lease Agreement except as they may be modified hereby.
This Equipment Schedule shall become effective upon execution on date same is
executed by Lessor.

TOTAL EQUIPMENT COST OF THIS SCHEDULE:   $24,955.75          Metasyn
                                                     -------
                                                     /s/ MEC DVI
                                                     -------
FUNDING EXPIRATION DATE:  May 31, 1996

RENTAL AMOUNT:  XXXXXXX  $801.08             Metasyn
                                   --------
                                   /s/  MEC  DVI
                                   --------
INITIAL TERM:   36 Months

FREQUENCY:  Monthly in Advance

EQUIPMENT DESCRIPTION:  See Exhibit A Attached Hereto

ADVANCE RENTAL APPLIED:  Last Month's

COMMENCEMENT DATE:  April 1,1996

SECURITY DEPOSIT:  $0.00

EQUIPMENT LOCATION:                              LESSEE CONTACT:
Metasyn, Inc.                                    Name:  Margot MacArthur
71 Rogers Street                                 Phone: (617) 499-1400
Cambridge, MA  02142

IN WITNESS WHEREOF,

DOMINION VENTURES, INC.                        METASYN, INC.


By:   /s/  M. Ellie Campbell                   By:  /s/  M.D. Webb
     ------------------------------               -----------------------------
Its: Director of Operations                    Its: President & CEO
     ------------------------------               -----------------------------
Date: 4/10/96 
     ------------------------------               -----------------------------


<PAGE>


                         Metasyn, Inc. Appex A (8050-13)
<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
Vendor             P.O.    Model Number/    Qnty    Equipment          Feature                              Feature     Equipment
Name               Number  Serial Number            Description        Description                          Cost        Cost
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                <C>      <C>             <C>   <C>                   <C>                                <C>           <C>
Co. Comp, Inc.      3234                          Computer Equipment    Yamaha CD Recorder W/Caddy          3,580.00      3,750.00
                                                                        3M Certified Recordable 74 min.       170.00
                                                                                                                          --------
Co. Comp, Inc.                                                                                                            3,750.00

Cole-Parmer         5003195                       Computer Equipment    Pumphd, Mflex Easy Load               315.00      1,250.00
                                                                        Drive, Mflex Bench 115V               935.00
                                                                                                                          --------
Cole-Parmer                                                                                                               1,250.00

Fisher Scientific   3220    1  989  08       1    Monitor HCN Toxilog                                                       913.75
 
                                                                                                                          --------
Fisher Scientific                                                                                                           913.75

Hewlett-Packard                                   Lab Equipment          Autosampler For HP 6890 GC         9,020.00
                                                                         HP - IB Cable                        220.00
                                                                         ADD GC Instrument Control Module   1,575.00     10,815.00
                                                                                                                          --------
Hewlett-Packard                                                                                                          10,815.00

Mac Warehouse      50-0323                        Computer Equipment     Power Mac 7200/75                  1,339.00      8,227.00
                                                                         (2) Power Mac 7500/100 16MB        5,198.00
                                                                         Apple Design Keyboard                 79.00
                                                                         (4) 8MB Dimm-7ons                    796.00
                                                                         (2) Sportster 28.8 Fax               390.00
Mac Warehouse      5003237     MONO084        1   Apple Multi Scan 15"                                                      425.00
                                                                                                                          --------
Mac Warehouse                                                                                                             8,227.00

Grand Total                                                                                                              24,955.75

</TABLE>



<PAGE>

                               EQUIPMENT SCHEDULE
                                     8050-14
                   to Master Lease Agreement Number 8050 Dated
                                December 21, 1992

LESSOR:   Dominion Ventures, Inc.     LESSEE:  Metasyn, Inc.
          44 Montgomery Street                 71 Rogers Street
          Suite 4200                           Cambridge, MA  02142
          San Francisco, CA   94104

All terms and conditions of the above referenced Master Lease Agreement are
hereby expressly incorporated into this Equipment Schedule and made a part
hereof as if such terms and conditions were fully set forth herein. By their
execution of the Equipment Schedule the parties reaffirm all terms and
conditions of the Master Lease Agreement except as they may be modified hereby.
This Equipment Schedule shall become effective upon execution on date same is
executed by Lessor.

TOTAL EQUIPMENT COST OF THIS SCHEDULE:  $26,574.00

FUNDING EXPIRATION DATE:  May 31, 1996

RENTAL AMOUNT:  $853.03

INITIAL TERM:   36 Months

FREQUENCY:  Monthly in Advance

EQUIPMENT DESCRIPTION:  See Exhibit A Attached Hereto

ADVANCE RENTAL APPLIED:  Last Month's

COMMENCEMENT DATE:  July 1,1996

SECURITY DEPOSIT:  $0.00

EQUIPMENT LOCATION:                           LESSEE CONTACT:
Metasyn, Inc.                                 Name:  Doreen Murray
71 Rogers Street                              Phone: (617) 499-1400
Cambridge, MA  02142

IN WITNESS WHEREOF,

DOMINION VENTURES, INC.                       METASYN, INC.


By:  /s/ Michael K. Lee                       By:  /s/ M.D. Webb
   -------------------------------               -----------------------------
Its: Managing Gen. Partner                    Its: President and CEO
   -------------------------------               -----------------------------
Date: 6/11/96
   -------------------------------               -----------------------------



<PAGE>


                         Metasyn, Inc. Annex A (8050-14)


<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
Vendor             P.O.    Model Number/    Qnty    Equipment          Feature                              Feature     Equipment
Name               Number  Serial Number            Description        Description                          Cost        Cost
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                <C>      <C>             <C>   <C>                <C>                                    <C>           <C>

J-Kem Scientific   50-0324    Lot                 Lab Equipment       Data Collection Module                   890.00      1,325.00
                   3                                                  6 Channel Amplifier Module               435.00
                                                                                                                           --------
J-Kem Scientific                                                                                                           1,325.00

Johnstone Supply   60-0329    Ns-Tfe-1211         Air Conditioner                                                          1,156.00
                   A                                                                                                       --------
Johnstone Supply                                                                                                           1,156.00
Mac Warehouse      60-0294    CPU0103        (2)  Apple Powerbook                                                          8,600.00
                   3
Mac Warehouse      60-3616    Lot                 Computer Equipment  Power Mac 7200/75                      1,475.00     15,493.00

                   2                                                  (2) Power Mac 7500/100                 5,500.00
                                                                      Power Mac 8500/120                     3,695.00
                                                                      (3) Apple Multiple scan 15" Display    1,275.00
                                                                      Applevision 1710                         949.00
                                                                      (4) Apple Design Keyboard                316.00
                                                                      Geoport Adapter For Power Mac            129.00
                                                                      (5) 8MB Dimm-7ons (168 Pin)            1,125.00
                                                                      Duo Dock Plus                            839.00
                                                                      288 Platinum Teleport                    190.00
                                                                                                                           --------

Mac Warehouse                                                                                                             24,093.00

Grand Total                                                                                                               26,574.00

</TABLE>
<PAGE>



                        METASYN, INC. (SCHEDULE 8050-14)

EQUIPMENT   FEATURE
DESCRIPTION MODEL #      FEATURE DESCRIPTION                  FEATURE COST
- ----------  -------      -------------------                  ------------
                                                              
LAB EQUIPMENT            Data Collection Module                   890.00  
          TC-6           Channel Amplifier Module                 435.00  
AIR CONDITIONER
(2) APPLE POWERBOOK
COMPUTER EQUIPMENT
          CPU0071        Power Mac 7200/75                      1,475.00  
          CPU0075        (2) Power Mac 7500/100                 5,500.00  
          CPU0072        Power Mac 8500/120                     3,695.00  
          MONO084        (3) Apple Multiple scan 15" Display    1,275.00  
          MONO140        Applevision 1710                         949.00  
          INPO451        (4) Apple Design Keyboard                316.00  
          ACC1626        Geoport Adapter For Power Mac            129.00  
          CHP0139        (5) 8MB Dimm-7ons (168 Pin)            1,125.00  
          DR11093        Duo Dock Plus                            839.00  
          DMD1452        Platinum Teleport                        190.00  
                                                 

TOTAL FEATURE COST                                             16,818.00



<PAGE>

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------
P.O.      EQUIPMENT           MODEL NUMBER/  FEATURE                              FEATURE           EQUIPMENT
NO.       DESCRIPTION         SERIAL NUMBER  DESCRIPTION                          COST              COST
- --------------------------------------------------------------------------------------------------------------
<S>      <C>                  <C>            <C>                                   <C>             <C>

- -0329     Air Conditioner     NS-TFE-1211                                                           1,156.00
- -0324     Lab Equipment       LOT            Data Collection Module                   890.00        1,325.00
                                             6 Channel Amplifier Module               435.00 
                                                                                                    8,600.00
                                                
- -0294     (2) Apple Powerbook CPU0103

- -3616     COMPUTER EQUIPMENT  LOT            Power Mac 7200/75                      1,475.00       15,493.00

                                             (2) Power Mac 7500/100                 5,500.00 
                                             Power Mac 8500/120                     3,695.00 
                                             (3) Apple Multiple scan 15" Display    1,275.00 
                                             Applevision 1710                         949.00 
                                             (4) Apple Design Keyboard                316.00 
                                             Geoport Adapter For Power Mac            129.00 
                                             (5) 8MB Dimm-7ons (168 Pin)            1,125.00 
                                             Duo Dock Plus                            839.00 
                                             Platinum Teleport                        190.00 

TOTAL EQUIPMENT COST                                                                               26,574.00

</TABLE>




                                                                  Exhibit 23.2 

                       Consent of Independent Auditors 

   We consent to the reference to our firm under the captions "Selected 
Financial Data" and "Experts" and to the use of our report dated April 12, 
1996 (except for Note 14, as to which the date is August 30, 1996) in the 
Amendment No. 1 to the Registration Statement (Form S-1 No. 333-17581) and 
the related Prospectus of EPIX Medical, Inc. for the registration of 
2,300,000 shares of its common stock. 


                                                          /s/Ernst & Young LLP
                                                          ---------------------
                                                             Ernst & Young LLP 

Boston, Massachusetts 
January 16, 1997 





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