GENZYME CORP, S-3, 1997-09-04

GENZYME CORP
S-3, 1997-09-04
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)

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<PAGE> 1
As filed with the Securities and Exchange Commission on September 4, 1997.

Registration No. 333-
---------------------

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

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

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

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

GENZYME CORPORATION
(Exact name of registrant as specified in its charter)

MASSACHUSETTS 06-1047163
(State or other jurisdiction (I.R.S. Employer
of incorporation or organization) Identification Number)

ONE KENDALL SQUARE, CAMBRIDGE, MASSACHUSETTS 02139 (617) 252-7500
(Address, including zip code, and telephone number, including area
code, of registrant's principal executive offices)

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

PETER WIRTH, ESQ.
Executive Vice President and Chief Legal Officer
Genzyme Corporation
One Kendall Square
Cambridge, Massachusetts 02139
(617) 252-7500
(Name, address, including zip code, and telephone number, including area code,
of agent for service)

with copies to:

MAUREEN P. MANNING, ESQ. GEOFFREY E. LIEBMANN, ESQ.
Palmer & Dodge LLP Cahill Gordon & Reindel
One Beacon Street 80 Pine Street
Boston, Massachusetts 02108 New York, New York 10005
(617) 573-0100 (212) 701-3000

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

Approximate date of commencement of proposed sale to the public:

As soon as practicable after the effective date of this Registration Statement.

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

If the only securities being registered on this Form are being offered pursuant
to dividend or interest reinvestment plans, please check the following box. [ ]

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

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

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

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

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

<PAGE> 2

CALCULATION OF REGISTRATION FEE
- ----------------------------------------------------------------------------------------------------
Title of each class of securities Proposed maximum aggregate
to be registered offering price (1) Amount of registration fee
- ----------------------------------------------------------------------------------------------------
<S> <C> <C>
Genzyme Tissue Repair Division $40,000,000 $12,121.21
Common Stock
- ----------------------------------------------------------------------------------------------------
(1) Estimated solely for the purpose of calculating the registration fee pursuant to Rule 457(o)
under the Securities Act of 1933.

</TABLE>

THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT 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 SAID SECTION 8(a),
MAY DETERMINE.

<PAGE> 3
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 SEPTEMBER 4, 1997

_____________ SHARES

GENZYME TISSUE REPAIR

GENZYME TISSUE REPAIR DIVISION COMMON STOCK
($.01 PAR VALUE)

______________

All of the shares of Genzyme Tissue Repair Division Common Stock ("GTR
Stock") offered hereby are being sold by Genzyme Corporation ("Genzyme"). The
GTR Stock is listed on the Nasdaq National Market under the symbol "GENZL." On
September 3, 1997, the last reported sale price of the GTR Stock on the Nasdaq
National Market was $11.00 per share.

The GTR Stock is common stock of Genzyme and is intended to reflect the
value and track the performance of Genzyme Tissue Repair ("GTR"), which is a
leading developer of biological products for the surgical repair or replacement
of damaged tissue. The GTR Stock is one of three series of Genzyme's common
stock currently outstanding, the others being Genzyme General Division Common
Stock and Genzyme Molecular Oncology Division Common Stock. See "Description of
Genzyme Capital Stock" for a description of the rights and privileges of shares
of each series of Genzyme common stock.

______________

FOR A DISCUSSION OF CERTAIN FACTORS THAT SHOULD BE CONSIDERED IN CONNECTION WITH
AN INVESTMENT IN GTR STOCK, SEE "RISK FACTORS" BEGINNING ON PAGE 6 HEREIN.

______________

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 AD-
EQUACY OF THIS PROSPECTUS. ANY REPRESENTATION
TO THE CONTRARY IS A CRIMINAL OFFENSE.

<TABLE>
<CAPTION>
Underwriting
Price to Discounts and Proceeds to
Public Commissions Company(1)
-------- ------------- -----------
<S> <C> <C> <C>
Per Share............... $ $ $
Total (2)............... $ $ $
</TABLE>

(1) Before deduction of expenses payable by Genzyme estimated at $ .
(2) Genzyme has granted the Underwriters an option, exercisable for 30 days
from the date of this Prospectus, to purchase a maximum of additional
shares to cover over-allotments of shares. If the option is exercised in
full, the total Price to Public will be $ , Underwriting Discounts
and Commissions will be $ and Proceeds to Company will be $ .

______________

The shares are offered by the several Underwriters when, as and if issued
by Genzyme, delivered to and accepted by the Underwriters and subject to their
right to reject orders in whole or in part. It is expected that the shares will
be ready for delivery on or about , 1997.

CREDIT SUISSE FIRST BOSTON COWEN & COMPANY PAINEWEBBER INCORPORATED

THE DATE OF THIS PROSPECTUS IS ________ ___, 1997.

<PAGE> 4

[The graphic image depicted here consists of a diagram of a human knee
and two photographs of an actual patient's knee before and after autologous
chondrocyte implantation. The diagram shows the structure of the human knee and
depicts an articular cartilage defect labeled "lesion". Three additional
components of the human knee, the "lateral femoral condyle", the "medial femoral
condyle" and the "trochlea" are also depicted and labeled in the diagram. The
first photograph depicts the cartilage defect (1.1 by 4.0 cm) in the medial
femoral condyle of a 22 year old female patient before autologous chondrocyte
implantation. The second photograph shows the cartilage defect, which is now
healed, 46 months after autologous chondrocyte implantation. The borders of the
transplant are indicated by arrows.]

Panel A: Human Knee with defect in the medial femoral condyle.

Panel B: Cartilage defect in the medial femoral condyle of a 22 year old female
before autologous chondrocyte implantation.

Panel C: Healed cartilage defect of the same patient 46 months after autologous
chondrocyte implantation.

CERTAIN PERSONS PARTICIPATING IN THIS OFFERING MAY ENGAGE IN TRANSACTIONS THAT
STABILIZE, MAINTAIN, OR OTHERWISE AFFECT THE PRICE OF THE GTR STOCK, INCLUDING
OVER-ALLOTMENT, STABILIZING TRANSACTIONS, SYNDICATE SHORT COVERING
TRANSACTIONS, PENALTY BIDS AND PASSIVE MARKET MAKING. FOR A DESCRIPTION OF
THESE ACTIVITIES, SEE "UNDERWRITING."

<PAGE> 5

PROSPECTUS SUMMARY

The following summary is qualified in its entirety by the more detailed
information and the financial statements appearing elsewhere in this Prospectus
and in the documents incorporated into this Prospectus by reference. Unless
otherwise indicated or the context otherwise requires, (i) information in this
Prospectus assumes that the Underwriters' over-allotment option will not be
exercised and (ii) all references herein to shares of GTR Stock, Genzyme General
Division Common Stock ("GGD Stock") and Genzyme Molecular Oncology Division
Common Stock ("GMO Stock") also include the associated preferred stock purchase
rights represented by the same certificates. See "Description of Genzyme Capital
Stock." The shares of GTR Stock offered hereby involve a high degree of risk.
Investors should carefully consider the information set forth under the heading
"Risk Factors."

GENZYME TISSUE REPAIR

Genzyme Tissue Repair is a leading developer of biological products for
the surgical repair or replacement of damaged tissue. GTR's lead product,
Carticel(TM) autologous cultured chondrocytes ("Carticel (TM) ACC"), received
U.S. Food and Drug Administration ("FDA") approval in August 1997 for the
treatment of damaged articular knee cartilage. GTR also markets the Epicel(SM)
Service for the treatment of severe burns and is developing two NeuroCell(TM)
products to treat Parkinson's and Huntington's diseases as well as
TGF-(beta)2 to treat chronic skin ulcers.

Autologous chondrocyte implantation ("ACI") was developed by GTR's
exclusive collaborators in Sweden in 1987. ACI is a procedure in which a
patient's own (autologous) healthy articular cartilage cells (chondrocytes) are
cultured in the lab and implanted in the same patient's knee joint to repair
cartilage damage due to a variety of injuries, including acute or chronic
trauma. Carticel(TM) ACC, which has been marketed by GTR since 1995, is the
only FDA-approved autologous cultured chondrocyte product. Since 1987, over
1,000 patients have undergone the ACI procedure, including more than 600 using
Carticel(TM) ACC. A substantial body of clinical data from these patients
supports the safety and efficacy of the procedure. GTR's analysis of the first
84 patients treated with Carticel(TM) ACC for which 12-month data are available
indicates that over 80% of patients improved based on clinician and patient
evaluations. See "Business - Cartilage Repair - Carticel(TM) ACC - Clinical
Results." In contrast, approximately 80% of patients treated with existing
therapies, such as microfracture, drilling and abrasion, are expected to have
poor long-term outcomes.

GTR believes there is a significant market opportunity to treat patients
with articular cartilage damage in the knee. In 1994, there were approximately
189,000 surgical procedures performed in the U.S. to treat damage to articular
knee cartilage. GTR estimates that at least half of these procedures were for
injuries involving damage to the femoral condyle, the area of the knee for
which treatment with Carticel(TM) ACC has been approved by the FDA. GTR
estimates that the European market for knee cartilage repair is similar in size
to the U.S. market.

Carticel(TM) ACC was the first product approved under new FDA
regulations developed for manipulated autologous cell products. GTR believes
that the absence of FDA approval previously limited market acceptance of
Carticel(TM) ACC because many third party payers require such approval for
reimbursement. GTR believes that the recent FDA approval of Carticel(TM) ACC
will therefore facilitate the development of broader reimbursement coverage for
the product.

In addition to Carticel(TM) ACC, GTR has a diverse pipeline of other
tissue repair products that also address significant medical problems for which
there are currently no effective therapies. GTR is developing two cellular
therapies for neurodegenerative diseases -- NeuroCell(TM)-PD for the treatment
of Parkinson's disease and NeuroCell(TM)-HD for the treatment of Huntington's
disease. These products involve implantation of fetal porcine (pig) brain cells
into Parkinson's and Huntington's disease patients to replace damaged brain
tissue. The NeuroCell(TM) products are being developed in a joint venture with
Diacrin, Inc. ("Diacrin") and are currently in Phase I clinical trials. GTR also
markets the Epicel(SM) Service, which provides cultured autologous skin cells

<PAGE> 6

as permanent skin replacement for patients with severe burns, and is developing
TGF-(beta)2, a recombinant growth factor iN Phase II clinical trials, to treat
chronic skin ulcers.

GTR's strategy is to use its expertise in cell processing, therapeutic
protein development and biomaterials engineering to develop and sell a portfolio
of novel products and services for unmet medical needs in the orthopedic,
neurology and wound closure markets. GTR believes that, as a division of
Genzyme, its ability to pursue this strategy is enhanced through its access to
Genzyme's infrastructure.

THE OFFERING
<TABLE>
<CAPTION>
<S> <C>
GTR Stock offered by Genzyme..................... ___________ shares
GTR Stock to be outstanding after the offering .. ___________ shares(1)
Use of proceeds.................................. To fund the research and
development activities of
GTR, including its joint
venture with Diacrin, for
working capital, to pay
expenses related to the
marketing of Carticel(TM)
ACC and for general corporate
purposes.
Nasdaq National Market symbol.................... GENZL
</TABLE>

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

(1) Based on shares outstanding on July 31, 1997. Excludes (i) 2,390,200
shares of GTR Stock reserved for issuance upon exercise of outstanding
options with a weighted average exercise price of $10.67 per share, (ii)
893,847 shares of GTR Stock that Genzyme may from time to time issue,
sell or otherwise distribute without allocating any proceeds to GTR
("GTR Designated Shares") and (iii) 2,577,245 shares of GTR Stock
currently reserved for issuance upon conversion of amounts payable under
a convertible note of Genzyme (the "GTR Note") in the principal amount
of $13 million. The actual number of shares issued upon conversion of
the GTR Note may be more or less than the number currently reserved.
See "Risk Factors - Risks Related to GTR - Dilution."

<PAGE> 7

GTR SUMMARY FINANCIAL DATA
(In thousands, except per share data)

<TABLE>
<CAPTION>
FOR THE SIX
MONTHS ENDED
FOR THE YEARS ENDED DECEMBER 31, JUNE 30,
-------------------------------------- ------------------------
1994 1995 1996 1996 1997
-------- -------- -------- -------- ---------
<S> <C> <C> <C> <C> <C>
COMBINED STATEMENT OF OPERATIONS DATA:

Net service sales................................ $ 324 $ 5,220 $ 7,312 $ 3,361 $ 4,641
-------- -------- -------- -------- ---------

Operating costs and expenses:
Cost of services sold.......................... 287 4,731 11,193 5,882 5,991
Selling, general and administrative............ 964 12,927 27,111 12,976 12,658
Research and development....................... 3,638 10,938 10,880 4,704 4,996
Purchase of in-process research
and development.............................. 11,215 - - - -
-------- -------- -------- -------- ---------
Total operating costs and expenses........... 16,104 28,596 49,184 23,562 23,645
-------- -------- -------- -------- ---------

Operating loss................................... (15,780) (23,376) (41,872) (20,201) (19,004)

Other income and (expenses):
Equity in loss of joint venture................ - - (1,727) - (3,416)
Interest and investment income, net............ 29 1,346 1,284 959 (840)
-------- -------- -------- -------- ---------
Total other income and (expenses)............ 29 1,346 (443) 959 (4,256)
-------- -------- -------- -------- ---------

Net loss attributable to GTR Stock............... $(15,751) $(22,030) $(42,315) $(19,242) $ (23,260)

Per GTR common share:
Net loss....................................... $ (4.40) $ (2.28) $ (3.38) $ (1.55) $ (1.76)
Weighted average shares outstanding............ 3,578 9,659 12,525 12,411 13,208

AT DECEMBER 31, AT JUNE 30, 1997
------------------------------------- -----------------------
1994 1995 1996 ACTUAL AS ADJUSTED(1)
------- ------- ------- -------- -----------
<S> <C> <C> <C> <C> <C>
COMBINED BALANCE SHEET DATA:

Cash and investments............................. $24,808 $47,573 $16,230 $20,900 $
Working capital.................................. 20,557 44,374 14,232 19,834
Total assets..................................... 28,435 52,649 42,593 47,260
Long-term obligations............................ - - 18,000 30,099
Division equity.................................. 23,313 45,926 18,084 11,523

</TABLE>

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

(1) As adjusted to reflect the net proceeds of this offering, estimated to
be $__________.

<PAGE> 8

RISK FACTORS

Statements made in this Prospectus relating to revenue expectations,
expectations regarding reimbursement for GTR's products, plans for product
development, sales and marketing and the timing of clinical trials and
regulatory approvals, or that otherwise relate to future periods, are
forward-looking statements within the meaning of Section 27A of the Securities
Act of 1933, as amended (the "Securities Act"), and Section 21E of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"). Actual results
could differ materially from those anticipated in the forward-looking statements
as a result of certain risks described below or elsewhere in this Prospectus
(including Genzyme's Annual Report on Form 10-K for 1996 and other documents
incorporated herein by reference). Such risks should be considered carefully in
evaluating an investment in GTR Stock.

RISKS RELATED TO GENZYME TRACKING STOCK

Prior to June 18, 1997, Genzyme had outstanding two classes of common
stock, GGD Stock and GTR Stock. Effective June 18, 1997, the GGD Stock and GTR
Stock were redesignated as separate series of a single class of common stock and
a new series of the same class of common stock, GMO Stock, was issued. As a
result, Genzyme currently has three series of common stock outstanding: GGD
Stock, GTR Stock and GMO Stock, which are intended to reflect the value and
track the performance of Genzyme's three operating divisions: Genzyme General
("Genzyme General"), GTR and Genzyme Molecular Oncology ("GMO"). Prospective
investors in GTR Stock should carefully consider the following risks relating to
an investment in Genzyme "tracking stock."

STOCKHOLDERS OF ONE COMPANY; FINANCIAL IMPACTS ON ONE DIVISION COULD AFFECT THE
OTHERS. Genzyme General, GTR and GMO are each divisions of Genzyme.
Notwithstanding the allocation of Genzyme's products and programs among
divisions for financial statement presentation purposes, Genzyme continues to
hold title to all of the assets and is responsible for all of the liabilities
allocated to each of its divisions. Holders of each series of Genzyme common
stock have no specific claim against the assets attributed for financial
statement presentation purposes to the division whose performance is associated
with the series of stock they hold. Liabilities or contingencies of any division
that affect Genzyme's resources or financial condition could affect the
financial condition or results of operations of the other divisions. Prospective
investors in GTR Stock should, therefore, read Genzyme's consolidated financial
statements in conjunction with the financial statements of GTR.

NO RIGHTS OR ADDITIONAL DUTIES WITH RESPECT TO THE DIVISIONS; POTENTIAL
CONFLICTS. Holders of each series of Genzyme common stock have only the rights
of stockholders of Genzyme and, except in limited circumstances, do not have any
rights specifically related to the division to which such series of common stock
relates.

The existence of separate series of common stock may give rise to
occasions when the interests of holders of each series of Genzyme common stock
may diverge or appear to diverge. Although Genzyme is aware of no precedent
concerning the manner in which Massachusetts law would be applied to the duties
of a board of directors in the context of multiple series of common stock with
divergent interests, Genzyme believes, based on the advice of counsel, that a
Massachusetts court would hold that a board of directors owes an equal duty to
all stockholders regardless of class or series and does not have separate or
additional duties to any group of stockholders. That duty is the fiduciary duty
to act in good faith and in a manner it reasonably believes to be in the best
interests of the corporation. Genzyme has been advised that, under Massachusetts
law, a good faith determination by a disinterested and adequately informed board
of directors that an action is in the best interests of the corporation, taking
into account the interests of the holders of each series of common stock and the
alternatives reasonably available, should represent an appropriate defense to
any challenge by or on behalf of the holders of any series of common stock that
such action could have a disparate effect on different series of common stock.
However, a Massachusetts court hearing a case involving such a challenge may
decide to apply principles of Massachusetts law other than those described
above, or may develop new principles of Massachusetts law, in order to decide
such a case.

<PAGE> 9

Disproportionate ownership interests of members of the Genzyme Board of
Directors (the "Genzyme Board") in any series of common stock or disparities in
the value of such stock could create or appear to create potential conflicts of
interest when directors are faced with decisions that could have different
implications for each series of common stock. Nevertheless, Genzyme believes
that a director would be able to discharge his or her fiduciary responsibilities
even if his or her interests in shares of such series were disproportionate or
had disparate values. The Genzyme Board may also from time to time establish one
or more committees to review matters presented to it that raise conflict issues,
which committee(s) would report to the full Genzyme Board on such matters.

NO ADDITIONAL SEPARATE VOTING RIGHTS. Holders of each series of Genzyme common
stock vote together as a single class on all matters as to which common
stockholders generally are entitled to vote (including the election of
directors). Except in certain limited circumstances provided under Massachusetts
law, in Genzyme's Restated Articles of Organization (the "Genzyme Charter"), and
in the management and accounting policies adopted by the Genzyme Board, holders
of each series of common stock have no right to vote on matters separately.
Accordingly, except in limited circumstances, holders of shares of one series of
common stock could not bring a proposal to a vote of the holders of that series
of common stock only, but would be required to bring any proposal to a vote of
all common stockholders.

On all matters as to which common stockholders generally are entitled to
vote, each share of GGD Stock has one vote, each share of GTR Stock has, through
December 31, 1998, .33 vote and each share of GMO Stock has, through
December 31, 1998, .25 vote. On January 1, 1999 and on January 1 every two years
thereafter, the number of votes to which each share of GTR Stock and GMO Stock
is entitled will be adjusted to equal the ratio of the Fair Market Value of one
share of GTR Stock and GMO Stock, respectively, to the Fair Market Value of one
share of GGD Stock as of such date. Fair Market Value as of any date means the
average of the daily closing prices as reported by the Nasdaq National Market
(or the appropriate exchange on which such shares are then traded) for the 20
consecutive trading days commencing on the 30th trading day prior to such date.
In the event such closing prices are unavailable, Fair Market Value will be
determined by the Genzyme Board.

Certain matters as to which the holders of common stock are entitled to
vote may involve a divergence or the appearance of a divergence in the interests
of holders of each series of Genzyme common stock. If, when a stockholder vote
is taken on any matter as to which a separate vote by each series is not
required and the holders of any series of common stock would have more than the
number of votes required to approve any such matter, the holders of that series
would control the outcome of the vote on such matter. Holders of GGD Stock, GTR
Stock and GMO Stock currently have approximately 92.6%, 6.2% and 1.2%,
respectively, of the total voting power of Genzyme. Following completion of this
offering and assuming that the Underwriters' over-allotment option is not
exercised, holders of GGD Stock, GTR Stock and GMO Stock will have approximately
___%, ___% and ___%, respectively, of the total voting power of Genzyme. As a
result, on matters which are submitted to a vote of common stockholders, the
preferences of the holders of GGD Stock are likely to dominate and determine the
outcome of such vote unless and until the relative number of shares outstanding
and/or the market value of each series of Genzyme common stock materially
changes. See "Description of Genzyme Capital Stock - Voting Rights."

EXCHANGE OF GTR STOCK AND GMO STOCK. The Genzyme Board can, in its sole
discretion, determine to exchange shares of GTR Stock and GMO Stock for cash or
shares of GGD Stock (or any combination thereof) at a 30% premium over Fair
Market Value of the GTR Stock or GMO Stock at any time. In addition, following a
disposition of all or substantially all of the assets of GTR or GMO, the shares
of GTR Stock or GMO Stock, as the case may be, are subject to mandatory exchange
by Genzyme for cash and/or shares of GGD Stock at a 30% premium over Fair Market
Value of such series of common stock as determined by the trading prices during
a specified period prior to public announcement of the disposition.
Consequently, holders of GTR Stock and GMO Stock may receive a greater or lesser
premium for their shares than any premium paid by a third party buyer of all or
substantially all of the assets of GTR or GMO. In addition, the right of the
Genzyme Board to exchange shares of GMO Stock or GTR Stock at a 30% premium over
the Fair Market Value of such shares does not preclude the Genzyme Board from
making an offer to exchange such shares on

<PAGE> 10

terms other than those provided in the Genzyme Charter. Although any alternative
offer would be subject to acceptance by the holders of the shares to be
exchanged, such offer could be made at a price representing a discount from the
then current market price of the shares or otherwise on terms less favorable
than those provided in the Genzyme Charter. See "Management and Accounting
Policies Governing the Relationship of Genzyme Divisions - Open Market Purchases
of Shares of Common Stock."

NO ADJUSTMENT TO LIQUIDATING DISTRIBUTIONS. In the event of a voluntary or
involuntary dissolution, liquidation or winding up of the affairs of Genzyme
(other than pursuant to a merger, business combination or sale of substantially
all assets), holders of outstanding shares of each series of Genzyme common
stock would receive the assets, if any, remaining for distribution to common
stockholders on a per share basis in proportion to the respective per share
liquidation units of such series. Currently, each share of GGD Stock has 100
liquidation units, each share of GTR Stock has 58 liquidation units and each
share of GMO Stock has 25 liquidation units. Because the liquidation units will
not be adjusted to reflect changes in the relative market value or performance
of each of the divisions of Genzyme, the per share liquidating distribution to a
holder of GGD Stock, GTR Stock or GMO Stock is not likely to correspond to the
value of the assets of Genzyme General, GTR or GMO, respectively, at the time of
a dissolution, liquidation or winding up of Genzyme.

MANAGEMENT AND ACCOUNTING POLICIES SUBJECT TO CHANGE. The Genzyme Board has
adopted certain management and accounting policies applicable to the preparation
of the financial statements of the divisions of Genzyme, the allocation of
corporate expenses, assets and liabilities and other accounting matters, the
reallocation of assets between divisions and other matters. These policies may,
except as stated therein, be modified or rescinded in the sole discretion of the
Genzyme Board without the approval of Genzyme's stockholders, subject to the
Genzyme Board's fiduciary duty to all holders of Genzyme's capital stock. The
Genzyme Board may also adopt additional policies depending upon the
circumstances. See "Management and Accounting Policies Governing the
Relationship of Genzyme Divisions."

USE OF OPERATING LOSSES BY OTHER GENZYME DIVISIONS. Genzyme's management and
accounting policies provide that to the extent any division of Genzyme is unable
to utilize its operating losses or other projected tax benefits to reduce its
current or deferred income tax expense, such losses or benefits may be
reallocated to another division on a quarterly basis. Accordingly, although the
actual payment of taxes is a corporate liability of Genzyme as a whole, separate
financial statements will be prepared for each division and any losses that
cannot be utilized by a division will not be carried forward to reduce the taxes
allocable to such division's earnings in the future. This could result in a
division with losses (such as GTR and GMO currently) being charged a greater
portion of the total corporate tax liability and reporting lower earnings after
taxes in the future than would have been the case if such division had retained
its losses or other benefits in the form of a net operating loss carryforward.

RISKS RELATED TO GTR

Prospective investors should carefully consider the following risks
associated with an investment in GTR Stock.

NO ASSURANCE OF COMMERCIAL SUCCESS OF Carticel(TM) ACC. In August 1997, the FDA
approved GTR's Biologics License Application ("BLA") for Carticel(TM) ACC. As a
condition to such approval, GTR has agreed to conduct two confirmatory
post-marketing studies, one of which will compare the long-term clinical effects
of treatment with Carticel(TM) ACC to certain other available treatments and
the other of which will compare treatment with Carticel(TM) ACC against a
placebo implant. Should these post-marketing studies demonstrate that treatment
with Carticel(TM) ACC is not superior to the alternatives studied, the FDA may
suspend or terminate GTR's license to market the product. If GTR were prohibited
from marketing Carticel(TM) ACC in the U.S., its results of operations would be
materially adversely affected.

The commercial success of Carticel(TM) ACC will also depend materially
on the ability of GTR to increase the approval rate for reimbursement of the
product from third party payers. To date, approvals of reimbursement
applications have been lower than anticipated by GTR. Although GTR expects that
the recent

<PAGE> 11

approval of the BLA for Carticel(TM) ACC will facilitate the development of
broader reimbursement coverage for the product, there can be no assurance that
this will be the case. If the reimbursement approval rate does not improve, the
commercialization of the Carticel(TM) ACC and GTR's results of operations may
be materially adversely affected.

The process used by GTR to grow autologous chondrocytes is not
patentable, and GTR does not yet have significant patent protection covering the
other methodologies used in providing Carticel(TM) ACC. Consequently, GTR is
unable to prevent a competitor from developing the ability to grow cartilage
cells and from offering a product that is similar or superior to Carticel(TM)
ACC. GTR's results of operations could be materially adversely affected if a
competitor were to develop such know-how and obtain FDA approval for an
autologous chondrocyte product. GTR is aware of at least one other company that
is culturing autologous chondrocytes for cartilage repair in Europe. See "Risk
Factors - Risks Related to GTR - Intense Competition."

GTR is marketing Carticel(TM) ACC to orthopedic surgeons. The commercial
success of the product depends on the extent to which sufficient numbers of
surgeons who are trained by GTR incorporate the product into their existing
practices. There can be no assurance that GTR will be successful in marketing
Carticel(TM) ACC to such surgeons or that such surgeons will use Carticel(TM)
ACC to the extent anticipated by GTR.

GTR OPERATING LOSSES AND CASH REQUIREMENTS. GTR is expected to experience
significant operating losses at least through 1998 as the market introduction of
Carticel(TM) ACC continues and its research and development and clinical
programs progress. There can be no assurance that GTR will ever achieve a
profitable level of operations or that profitability, if achieved, can be
sustained on an ongoing basis. GTR anticipates that the net proceeds from this
offering, together with existing cash balances allocated to GTR or approved for
reallocation from Genzyme General and cash generated from the sale of Carticel
(TM) ACC and the Epicel(SM) Service, will be sufficient to fund GTR's
operations through the end of 1998. Significant additional funds may be required
to continue operations at anticipated levels beyond 1998, however, and GTR may
be required to delay, scale back or eliminate certain of its programs or to
license third parties to commercialize technologies or products that it would
otherwise undertake itself if it does not have sufficient capital or is not
successful in raising additional capital.

GTR's cash requirements may vary from those now planned as a result of
numerous factors, including revenue fluctuations, reimbursement denials for
GTR's products, results of research and development and clinical testing by GTR
and its collaborators, competing technological and market developments and the
cost and timing of clinical trials and regulatory approvals. In addition, if GTR
commits to fund additional joint ventures or strategic collaborations or uses
cash to effect acquisitions, its cash requirements may increase significantly.

FLUCTUATION IN GTR'S QUARTERLY RESULTS. Revenues generated from the sale of
Carticel(TM) ACC are expected to fluctuate as GTR enrolls and trains additional
orthopedic surgeons and the product gains market and third party payer
acceptance. GTR's management is unable to predict the timing or magnitude of
such fluctuations, although GTR expects that its revenues from the sale of
Carticel(TM) ACC may be lower in the summer months as fewer operative
procedures are typically performed during those months. Sales of the Epicel(SM)
Service for the treatment of severe burns also comprise a material percentage of
GTR's revenues. Revenues realized from the Epicel(SM) Service fluctuate from
quarter to quarter due to the dependency of such revenues on many unpredictable
factors, including the number and survival rate of patients for which the Epicel
(SM) Service is the indicated treatment. Since GTR is required to maintain
extensive tissue culture facilities and a staff of trained personnel for both
Carticel(TM) ACC and the Epicel(SM) Service, a significant portion of GTR's
costs are fixed and, therefore, fluctuations in demand can have a material
adverse effect on GTR's results of operations.

COLLABORATION WITH DIACRIN, INC. - NO CURRENTLY APPROVED
XENOTRANSPLANTATION-BASED PRODUCTS; RELIANCE ON CELL TRANSPLANTATION TECHNOLOGY.
GTR has formed a joint venture with Diacrin to develop and commercialize
products based on transplantable fetal porcine brain cells for the treatment of
Parkinson's disease and Huntington's disease. Human therapeutic products based
on the transplantation of cells obtained from animals ("xenotransplantation")
represent a novel therapeutic approach that has not been subject to extensive
clinical

<PAGE> 12

testing. Xenotransplantation also poses a risk that viruses or other animal
pathogens will be unintentionally transmitted to a human patient. The FDA has
issued draft regulatory guidelines to reduce the risk of contamination of
xenotransplanted cellular products with infectious agents. Although GTR's
management believes the processes used to produce the porcine cell products
under development by the joint venture would comply with the guidelines as
drafted, such guidelines may undergo substantial revision before definitive
guidelines are issued by the FDA. There can be no assurance that definitive
guidelines will be issued by the FDA or that processes used by the joint venture
will comply with any guidelines that may be issued.

No xenotransplantation-based therapeutic product has been approved by the
FDA and there can be no assurance that any products developed by the joint
venture will be approved by the FDA or regulatory authorities in other
countries. There can also be no assurance that xenotransplantation-based
products, including the joint venture's product candidates, will be accepted by
the medical community or third party payers or that the degree of such
acceptance will not limit the size of the market for such products.

The success of the joint venture is also dependent upon the successful
development of cell transplantation technology. This technology currently has
limited clinical applications and there can be no assurance that it will result
in the development of any therapeutic products. If the cell transplantation
technology does not result in the development of such products, the joint
venture may be required to change dramatically the scope and direction of its
product development activities.

RELIANCE ON AGREEMENTS WITH KEY COLLABORATORS. Carticel(TM) ACC has been
developed based on the work of a group of Swedish physicians, the two leaders of
which are performing consulting services for GTR relating to the
commercialization and further development of the product. These two physicians
are parties to research and development consulting agreements with GTR (the
"Consulting Agreements") which prohibit them, without GTR's consent, from
performing consulting services for others in the field of cartilage and bone
repair. In addition, pursuant to the Consulting Agreements, each physician (i)
is prohibited from engaging in any business activity that is in competition with
the products or services being developed, manufactured or sold by GTR during the
term of Consulting Agreements (currently through 1998) and for a period of one
year after termination thereof, (ii) is subject to non-disclosure obligations
and (iii) has assigned to GTR all rights to inventions resulting from work
performed by each physician as a consultant to GTR, subject to royalties payable
to the inventing physician. There can be no assurance that the two physicians
will honor their obligations under the Consulting Agreements or that such
agreements will be renewed beyond 1998. In addition, there can be no assurance
that individuals who are familiar with the know-how underlying Carticel(TM) ACC
through their association with these physicians will not disclose such
information to GTR's competitors. The occurrence of either of these events could
have a material adverse effect on GTR's results of operations.

GTR is conducting additional research relating to Carticel(TM) ACC
pursuant to a sponsored research agreement with the University of Gotenburg in
Sweden and certain physicians, including the two referred to above. The
sponsored research agreement requires that all members of the investigative team
maintain the confidentiality of all information pertaining to GTR and its
business that may become known to them in connection with their work under the
agreement. The agreement also states that all inventions conceived or reduced to
practice during the course of the research program will be the property of GTR,
subject to royalties payable to the inventing physician. There can be no
assurance that the sponsored research agreement will be honored by the
individuals performing services thereunder.

INTENSE COMPETITION. GTR is engaged in a segment of the human health care
products industry that is extremely competitive. Competitors in the U.S. and
elsewhere are numerous and include major pharmaceutical, chemical and
biotechnology companies, many of which have substantially greater capital
resources, marketing experience, research and development staffs and facilities
than GTR. These companies may succeed in developing products that are more
effective than any that have been or may be developed by GTR and may also be
more successful than GTR in producing and marketing these products. GTR is aware
of at least one company that is culturing autologous chondrocytes for cartilage
repair in Europe and numerous additional companies developing competing products
for cartilage repair and the treatment of Parkinson's disease,

<PAGE> 13

Huntington's disease, burns, chronic wounds and multiple sclerosis. See
"Business - Cartilage Repair - Carticel(TM) ACC - Competition" and " -
Neurodegenerative Diseases - Diacrin/Genzyme LLC - Competition."

UNCERTAINTY REGARDING PATENTS AND PROTECTION OF PROPRIETARY TECHNOLOGY.
Genzyme's success depends, to a large extent, on its ability to maintain a
competitive technological position in its product areas. Proprietary rights
relating to Genzyme's products are protected from unauthorized use by third
parties only to the extent that they are covered by patents or are maintained in
confidence as trade secrets. Genzyme has filed for patents and has rights to
numerous patents and patent applications worldwide. While certain of Genzyme's
patents have been allowed or issued, there can be no assurance that such patents
or any additional patents that are allowed or issued, if any, will effectively
protect the proprietary technology of Genzyme. In addition, patent litigation is
widespread in the biotechnology industry and it is not possible to predict how
any such litigation will affect Genzyme.

No consistent policy has emerged from the U.S. Patent and Trademark
Office regarding the breadth of claims allowed in biotechnology patents and,
therefore, the degree of future protection for Genzyme's proprietary rights is
uncertain. The allowance of broader claims may increase the incidence and cost
of patent interference proceedings in the U.S. and the risk of infringement
litigation in the U.S. and abroad. Conversely, the allowance of narrower claims,
while reducing the risk of infringement, may limit the value of Genzyme's
proprietary rights under its patents, licenses and pending patent applications.

Genzyme actively monitors the patent filings of its competitors in an
effort to guide the design and development of its products to avoid
infringement. Notwithstanding these efforts, there can be no assurance that the
patents issued or licensed to Genzyme will remain free of challenge by third
parties. In addition, currently pending patent applications filed by third
parties may, if issued, cover GTR's products and services as ultimately
developed, which could have an adverse impact on GTR's results of operations in
amounts that cannot presently be determined. Genzyme may, depending on the final
formulation of such products and services, need to acquire licenses to, or
contest the validity of, such patents or any other similar patents that may be
issued. The extent to which Genzyme may need to license such rights or contest
the validity of such patents depends on the scope and validity of such patents
and ultimately on the final design or formulation of its products and services
under development. The cost and ability to license any such rights and the
likelihood of successfully contesting the validity of such patents are
uncertain.

Genzyme has also relied upon trade secrets, proprietary know-how and
continuing technological innovation to develop and maintain its competitive
position. There can be no assurance that others will not independently develop
such know-how or otherwise obtain access to Genzyme's technology. While
Genzyme's employees, consultants and corporate partners with access to
proprietary information are generally required to enter into confidentiality
agreements, there can be no assurance that these agreements will be honored.
Certain of Genzyme's consultants have developed portions of Genzyme's
proprietary technology at their respective universities or in governmental
laboratories. There can be no assurance that such universities or governmental
authorities will not assert rights to intellectual property arising out of
university or government based research conducted by such consultants.

REGULATION BY GOVERNMENT AGENCIES. Many of the products and services GTR plans
to manufacture and sell will require approval by governmental agencies in the
U.S. and elsewhere. In particular, human therapeutic and diagnostic products are
subject to pre-marketing approval by the FDA and comparable agencies in foreign
countries. The process of obtaining these approvals varies according to the
nature and use of the product and can involve lengthy and detailed laboratory
and clinical testing, sampling activities and other costly and time-consuming
procedures. Regulation of GTR's products and services could also limit GTR's
reimbursement for its products and services and otherwise materially affect the
results of operations of GTR. In addition, there can be no assurance that any of
the required approvals will be granted on a timely basis, if at all. For a
discussion of certain regulatory risks relating to Carticel(R) ACC, see "Risk
Factors - Risks Related to GTR - No Assurance of Commercial Success of
Carticel(R) ACC."

<PAGE> 14

RAPID TECHNOLOGICAL CHANGE. The field of biotechnology is expected to continue
to undergo significant and rapid technological change. Although GTR will seek to
expand its technological capabilities in order to remain competitive, there can
be no assurance that research and discoveries by others will not render GTR's
products or services obsolete.

UNCERTAINTY REGARDING SUCCESS OF CLINICAL TRIALS. Several of GTR's products,
including NeuroCell(TM)-PD and NeuroCell(TM)-HD, are currently in or will
require clinical trials to test safety and efficacy in humans for various
conditions. There can be no assurance that GTR will not encounter problems in
clinical trials that will cause it to delay or suspend clinical trials. In
addition, there can be no assurance that such clinical testing, if completed,
will ultimately show these products to be safe and efficacious.

THIRD PARTY REIMBURSEMENT AND HEALTH CARE COST CONTAINMENT INITIATIVES. A
majority of GTR's revenues are attributable directly or indirectly to payments
received from third party payers, including government health administration
authorities and private health insurers. Significant uncertainty exists as to
the reimbursement status of newly approved health care products, and third party
payers are increasingly challenging the prices charged for health care products
and services. Third party payers are also increasingly attempting to contain
health care costs by limiting both coverage and the level of reimbursement for
new therapeutic products and by refusing in some cases to provide coverage for
uses of approved products for disease indications for which the FDA has not
granted marketing approval. There can be no assurance that third party insurance
coverage will be available for any products or services developed by GTR. If
adequate coverage and reimbursement are not provided by government and other
third party payers for GTR's products and services, its results of operations
may be materially adversely affected. For a discussion of risks relating to
reimbursement for Carticel(R) ACC, see "Risk Factors - Risks Related to GTR No
Assurance of Commercial Success of Carticel(R) ACC."

In addition, Congress has from time to time discussed the possible
implementation of broad based health care cost containment measures. While these
discussions have not led to the enactment of any specific health care cost
containment legislation, it is possible that health care measures will again be
proposed in Congress. The effects on GTR of any such measures that are
ultimately adopted cannot be predicted at this time.

PRODUCT LIABILITY AND LIMITATIONS OF INSURANCE. GTR may be subject to product
liability claims in connection with the use or misuse of its products during
testing or after commercialization. While GTR has taken, and continues to take,
what it believes are appropriate precautions, there can be no assurance that GTR
will avoid significant liability exposure. Genzyme has only limited amounts of
product liability insurance and there can be no assurance that such insurance
will provide sufficient coverage against any or all potential product liability
claims. If Genzyme attempts to obtain additional insurance in the future, there
can be no assurance that it will be able to do so on acceptable terms, if at
all, or that such insurance will provide adequate coverage against claims
asserted.

POSSIBLE VOLATILITY OF SHARE PRICE AND ABSENCE OF DIVIDENDS. The market prices
for securities of biotechnology companies have been volatile. Factors such as
announcements of technological innovations or new commercial products by Genzyme
or its competitors, governmental regulation, patent or proprietary rights
developments, public concern as to the safety or other implications of
biotechnology products and market conditions in general may have a significant
impact on the market price of GTR Stock. No cash dividends have been paid to
date on Genzyme common stock, nor does Genzyme anticipate paying cash dividends
on such stock in the foreseeable future.

POSSIBLE ADVERSE EFFECT OF ANTI-TAKEOVER PROVISIONS. Certain provisions of
Massachusetts law, the Genzyme Charter and By-Laws and the terms of Genzyme's
stockholder rights plan may have the effect of delaying, deferring or preventing
a change in control of Genzyme or a change in its management and thus deprive
stockholders of the opportunity to receive a premium for their shares. In
addition, Genzyme's authorized capital stock includes shares of undesignated
common and preferred stock that may be issued from time to time by the Genzyme
Board in one or more series. This ability to issue or the issuance of additional
series of common and preferred stock could have the effect of discouraging
attempts to acquire control of Genzyme.

<PAGE> 15

DILUTION. Pursuant to an agreement made at the time of formation of GTR, the
Genzyme Board may allocate up to $10 million from Genzyme General to GTR on or
before June 14, 1998 in exchange for 1,000,000 GTR Designated Shares. In
addition, the Genzyme Board has authorized the allocation of up to $20 million
in cash from Genzyme General to GTR (the "GTR Equity Line"). Any amounts
allocated to GTR under the GTR Equity Line will result in an increase in such
number of GTR Designated Shares determined by dividing (i) the amount of cash so
allocated by (ii) the average of the daily closing prices of GTR Stock for the
20 consecutive trading days commencing on the 30th trading day prior to the date
of such allocation. Of the $20 million authorized for allocation to GTR,
approximately $6.0 million had been allocated as of June 30, 1997.

The GTR Designated Shares are not issued or outstanding, but may be
issued from time to time by the Genzyme Board without allocating any proceeds to
GTR or distributed as a stock dividend to the holders of GGD Stock. As of
July 31, 1997, there were 893,847 GTR Designated Shares. Pursuant to the
management and accounting policies adopted by the Genzyme Board, Genzyme is
required to distribute or sell the GTR Designated Shares annually to the extent
that the number of such shares (excluding those reserved for GGD optionholders
and the holders of instruments convertible into GGD Stock) exceeds 10% of the
shares of GTR Stock outstanding. Genzyme is unable to predict the effect that
the sales or distributions described in this paragraph may have on the then
prevailing market price of GTR Stock.

In addition, Genzyme currently has reserved 2,577,245 shares of GTR Stock
for issuance upon conversion of amounts payable under the GTR Note. The actual
number of shares issued upon conversion of the GTR Note may be more or less than
the number currently reserved. The GTR Note is convertible into shares of GTR
Stock at a discount to the average of the closing bid prices of GTR Stock as
reported by the Nasdaq National Market for the 25 trading days immediately
preceding the applicable conversion date (the "Conversion Price"). This discount
began at 2% on August 27, 1997 and increases by an additional one percent per
month thereafter until May 27, 1998. After May 27, 1998, the Conversion Price
will be equal to the lesser of: (i) 89% of the Conversion Price calculated as of
the actual conversion date and (ii) 89% of the Conversion Price calculated as of
May 27, 1998. The conversion of amounts payable under the GTR Note at a price
that is less than the price to the public in this offering will result in
dilution to investors in this offering.

RISKS RELATED TO OTHER GENZYME DIVISIONS

Holders of GTR Stock are stockholders of Genzyme, which owns all of the
assets and is responsible for all of the liabilities of GTR. Liabilities or
contingencies of the other divisions of Genzyme that affect Genzyme's resources
or financial condition could affect the financial condition or results of
operations of GTR. Accordingly, the following risk factors should be considered
carefully in contemplating an investment in GTR Stock.

DEPENDENCE ON CEREDASE(R) ENZYME AND CEREZYME(R) ENZYME SALES. Genzyme General's
results of operations are highly dependent upon the sales of Ceredase(R) enzyme
and Cerezyme(R) enzyme. Sales of Ceredase(R) enzyme and Cerezyme(R) enzyme in
1996 were $264.6 million, representing 62% of consolidated product sales in
1996.

Genzyme produces Ceredase(R) enzyme from an extract of human placental
tissue supplied by a French company that is the only significant commercial
source of this material. The current supply available is not sufficient to
produce enough Ceredase(R) enzyme to supply all present patients. To address
supply constraints, Genzyme has developed Cerezyme(R) enzyme, a recombinant form
of the enzyme. In October 1996, Genzyme General received FDA approval to
manufacture Cerezyme(R) enzyme in a new, large-scale manufacturing plant located
in Boston, Massachusetts. Once an uninterrupted supply of Cerezyme(R) enzyme can
be produced by the new plant, patients receiving Ceredase(R) enzyme will be
converted to Cerezyme(R) enzyme. Genzyme General will be required to continue
providing Ceredase(R) enzyme until the process of patient conversion is
completed. Any disruption in the supply or manufacturing process of Ceredase(R)
enzyme during the conversion period or, thereafter, in the supply or
manufacturing process of Cerezyme(R) enzyme, may have a material adverse effect
on revenue.

<PAGE> 16

FUTURE CAPITAL NEEDS. Although Genzyme currently has substantial cash resources,
it has committed to utilize a portion of such funds for certain purposes, such
as (i) completing the market introduction in the U.S. and Europe of its line of
biomaterial products based on hyaluronic acid to limit the formation of
postoperative adhesions, (ii) completing the market introduction of Carticel
(TM) ACC and developing, producing and marketing other products through GTR,
(iii) providing up to $25 million under a line of credit established for the
benefit of GMO and (iv) making certain payments to third parties in connection
with strategic collaborations.

Genzyme had approximately $179 million in cash, cash equivalents and
short and long-term investments at June 30, 1997. As of June 30, 1997,
approximately $118 million was outstanding under Genzyme's $225 million
revolving credit facility with a syndicate of commercial banks, $95 million of
which was allocated to Genzyme General, $18 million of which was allocated to
GTR and $5 million of which was allocated to GMO. Amounts borrowed under this
facility are payable on November 15, 1999. Genzyme's cash resources will be
diminished upon repayment of amounts borrowed, plus accrued interest, under this
credit facility. In addition, Genzyme privately placed the GTR Note in February
1997 to fund GTR's operations. Pursuant to the terms of the GTR Note, the holder
will, in some circumstances, receive cash from Genzyme and in others receive
shares of GTR Stock in lieu of cash. To the extent Genzyme uses cash to pay the
principal and accrued interest on the GTR Note, its cash reserves will also be
diminished. As a result, Genzyme may have to obtain additional financing. There
can be no assurance that such financing will be available on favorable terms, if
at all.

RISKS INHERENT IN INTERNATIONAL OPERATIONS. Foreign operations of Genzyme
accounted for 35% of consolidated net sales in 1996 as compared to 35% and 31%
in 1995 and 1994, respectively. In addition, Genzyme has direct investments in a
number of subsidiaries in foreign countries (primarily in Europe and Japan) and
purchases certain raw materials from a French supplier. Financial results of
Genzyme could be adversely affected by fluctuations in foreign exchange rates.
Fluctuations in the value of foreign currencies affect the dollar value of
Genzyme's net investment in foreign subsidiaries, with this fluctuation being
included in a separate component of stockholders' equity. Operating results of
foreign subsidiaries are translated into U.S. dollars at average monthly
exchange rates. In addition, the U.S. dollar value of transactions based in
foreign currency (collections on foreign sales or payments for foreign
purchases) also fluctuates with exchange rates. The largest foreign currency
exposure results from activity in British pounds, French francs, Swiss francs,
Dutch guilders, German marks and Japanese yen.

Genzyme attempts to manage this exposure by entering into forward
contracts with banks to the extent that the timing of currency flows can
reasonably be anticipated and by offsetting matching foreign currency
denominated assets with foreign currency denominated liabilities. Although
Genzyme has not hedged net foreign investments in the past, it may engage in
hedging transactions to manage and reduce its foreign exchange risk, subject to
certain restrictions imposed by the Genzyme Board. There can be no assurance
that Genzyme's attempts to manage its foreign currency exchange risk will be
successful.

<PAGE> 17

USE OF PROCEEDS

The net proceeds to be received from the sale of the shares of GTR Stock
offered hereby are estimated to be $__________ ($___________ if the
Underwriters' over-allotment option is exercised in full) and will be allocated
in full to GTR. While GTR currently has no commitments for use of the net
proceeds of this offering, GTR's management anticipates that approximately $___
million of the net proceeds of this offering will be used to fund the research
and development activities of GTR, including approximately $___ million to fund
GTR's obligations to the joint venture with Diacrin. The balance of such
proceeds will be used for working capital, to pay expenses related to the
marketing of Carticel(TM) ACC and for general corporate purposes. Until applied
to any of the foregoing uses, the net proceeds of this offering will be invested
in high-quality, short-term interest bearing investments or deposit accounts.

<PAGE> 18

CAPITALIZATION

The following table sets forth the capitalization of GTR as of June 30,
1997 and as adjusted to reflect the issuance of the shares of GTR Stock offered
hereby:

JUNE 30, 1997
--------------------------
(DOLLARS IN THOUSANDS)

ACTUAL AS ADJUSTED(1)
------- --------------
<S> <C> <C>
Long-term obligations.......................... $30,099 $
Division equity (2)............................ 11,523
------- -------

Total capitalization........................... $41,622 $
======= =======
</TABLE>

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

(1) As adjusted to reflect the application of the net proceeds of this
offering, estimated to be $____________.

(2) Excludes (i) 2,382,203 shares of GTR Stock reserved for issuance upon
exercise of outstanding options with a weighted average exercise price
of $10.67 per share, (ii) 3,160,939 GTR Designated Shares and (iii)
2,577,245 shares of GTR Stock currently reserved for issuance upon
conversion of amounts payable under the GTR Note. The actual number of
shares issued upon conversion of the GTR Note may be more or less than
the number currently reserved. See "Risk Factors - Risks Related to GTR
- Dilution."

16
<PAGE> 19

PRICE RANGE OF GTR STOCK
AND DIVIDEND POLICY

The GTR Stock is traded in the over-the-counter market and prices are
quoted on the Nasdaq National Market ("Nasdaq") under the symbol GENZL. The
following table sets forth, for the periods indicated, the high and low sale
prices for the GTR Stock as reported by Nasdaq.

HIGH LOW
------- ------
<S> <C> <C>
1995
First Quarter................................ 7 3/4 3 1/2
Second Quarter............................... 7 5/8 5 1/8
Third Quarter................................ 16 5/8 6 1/2
Fourth Quarter............................... 18 1/2 11 3/4

1996
First Quarter................................ 28 3/4 13 7/8
Second Quarter............................... 17 1/8 10 7/8
Third Quarter................................ 11 7/8 6 5/8
Fourth Quarter............................... 11 1/8 6 1/2

1997
First Quarter................................ 14 7/8 7
Second Quarter............................... 13 8 1/2
Third Quarter (through September 3, 1997).... 12 1/2 9
</TABLE>

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

On September 3, 1997, the closing sale price of GTR Stock as reported by
Nasdaq was $11.00 per share. There were 4,389 holders of record of GTR Stock as
of July 31, 1997.

Genzyme has never paid a cash dividend on shares of its capital stock; it
has retained all earnings for use in its business. Genzyme expects to continue
to follow the policy of retaining funds for reinvestment in its business.

<PAGE> 20

GENZYME TISSUE REPAIR
SELECTED FINANCIAL DATA

The following table represents selected historical combined statement of
operations and balance sheet data of GTR. The balance sheet data presented below
as of December 31, 1992, 1993, 1994, 1995 and 1996 and the statement of
operations data presented below for each of the years in the five-year period
ended December 31, 1996 are derived from GTR's financial statements, which have
been audited by Coopers & Lybrand L.L.P., independent accountants. The financial
statements as of December 31, 1995 and 1996 and for each of the years in the
three-year period ended December 31, 1996 and the report of Coopers & Lybrand
L.L.P. relating thereto are incorporated by reference in this Prospectus from
Genzyme's Annual Report on Form 10-K for the year ended December 31, 1996 and
the selected financial data presented below are qualified in their entirety by
reference thereto. The balance sheet data presented below as of June 30, 1997
and statement of operations data presented below for the six-month periods ended
June 30, 1996 and 1997 are derived from GTR's unaudited financial statements
which are also incorporated herein by reference from Genzyme's Quarterly Report
on Form 10-Q for the quarter ended June 30, 1997. In the opinion of management,
the unaudited financial statements have been prepared on a basis consistent with
the audited financial statements and include all adjustments, consisting only of
normal recurring accruals, necessary for a fair presentation of the financial
position and results of operations for these periods. The operating results for
the six months ended June 30, 1997 are not necessarily indicative of the
results that may be expected for the entire fiscal year. The data should be
read in conjunction with the historical financial statements and notes thereto
and related Management's Discussion and Analysis of Financial Condition and
Results of Operations of GTR presented herein. See also "Incorporation of
Certain Documents by Reference." Amounts are in thousands, except for per share
amounts.

<TABLE>
<CAPTION>
FOR THE SIX
MONTHS ENDED
FOR THE YEARS ENDED DECEMBER 31, JUNE 30,
------------------------------------------------------ ---------------------
1992 1993 1994 1995 1996 1996 1997
------ -------- -------- -------- -------- -------- --------
<S> <C> <C> <C> <C> <C> <C> <C>
STATEMENT OF OPERATIONS DATA:

Revenues:
Net service sales.......................... $ - $ - $ 324 $ 5,220 $ 7,312 $ 3,361 $ 4,641
Related party revenues:
Technology license fee(1)............... - 2,000 - - - - -
Revenues from research and
development contracts................ 2,666 2,684 - - - - -
------ -------- -------- -------- -------- -------- --------
Total revenues....................... 2,666 4,684 324 5,220 7,312 3,361 4,641
------ -------- -------- -------- -------- -------- --------

Operating costs and expenses:
Cost of services sold...................... - - 287 4,731 11,193 5,882 5,991
Selling, general and administrative........ 823 701 964 12,927 27,111 12,976 12,658
Research and development (including
research and development related
to contracts)........................... 2,351 2,805 3,638 10,938 10,880 4,704 4,996
Purchase of in-process research
and development(2)...................... - 25,000 11,215 - - - -
------ -------- -------- -------- -------- -------- --------
Total operating costs and expenses...... 3,174 28,506 16,104 28,596 49,184 23,562 23,645
------ -------- -------- -------- -------- -------- --------

Operating loss................................ (508) (23,822) (15,780) (23,376) (41,872) (20,201) (19,004)

Other income and (expenses):
Equity in loss of joint venture(3)......... - - - - (1,727) - (3,416)
Investment income.......................... - - 29 1,386 1,432 964 398
Interest expense........................... - - - (40) (148) (5) (1,238)
------ -------- -------- -------- -------- -------- --------
Total other income and (expenses)....... - - 29 1,346 (443) 959 (4,256)
------ -------- -------- -------- -------- -------- --------

Loss before income taxes...................... (508) (23,822) (15,751) (22,030) (42,315) (19,242) (23,260)
Provision for income taxes.................... - (38) - - - - -
Tax benefit allocated to Genzyme General...... - (255) - - - - -
------ -------- -------- -------- -------- -------- --------
Net loss attributable to GTR Stock(4)......... $ (508) $(24,115) $(15,751) $(22,030) $(42,315) $(19,242) $(23,260)

Per GTR common share:
Net loss(4)................................ $(0.17) $ (7.43) $ (4.40) $ (2.28) $ (3.38) $ (1.55) $ (1.76)
Weighted average shares outstanding(4) 3,019 3,245 3,578 9,659 12,525 12,411 13,208
</TABLE>

<PAGE> 21

AT DECEMBER 31, AT JUNE 30, 1997
----------------------------------------------------- ------------------------
1992 1993 1994 1995 1996 ACTUAL AS ADJUSTED(5)
----- ---- ------- ------- ------- ------- --------------
<S> <C> <C> <C> <C> <C> <C> <C>
COMBINED BALANCE SHEET DATA:

Cash and investments(6)....................... $ - $ - $24,808 $47,573 $16,230 $20,900 $
Working capital............................... (149) - 20,557 44,374 14,232 19,834
Total assets.................................. - - 28,435 52,649 42,593 47,260
Long-term obligations(7,8).................... - - - - 18,000 30,099
Division equity(3,8,9)........................ (149) - 23,313 45,926 18,084 11,523
</TABLE>

There were no cash dividends paid.

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

(1) GTR received a $2.0 million technology license fee from Neozyme Corporation
("Neozyme I") in July 1993 related to the expansion of the Vianain(R)
Debriding Product.

(2) GTR acquired (a) the rights to Neozyme I's Vianain(R) development program
in 1993 and (b) all of the outstanding stock of BioSurface Technology, Inc.
("BioSurface") in 1994. These acquisitions were accounted for as purchases.
In-process research and development acquired in connection with the
acquisitions was charged to operations.

(3) In 1996, in connection with the formation of the joint venture with
Diacrin, the Genzyme Board authorized the allocation of up to $20 million
in cash from Genzyme General to GTR. Of the $20 million authorized,
$1.9 million and $4.1 million were allocated in 1996 and the first six
months of 1997, respectively, resulting in the creation of 231,645 and
401,256 GTR Designated Shares, respectively. For the year ended
December 31, 1996 and the six months ended June 30, 1997, GTR realized
net losses from the joint venture of $1.7 million and $3.4 million,
respectively.

(4) Net loss attributable to GTR and net loss per share for the years ended
December 31, 1992 and 1993 give effect to the management and accounting
policies adopted by the Genzyme Board in connection with the creation of
GTR and, accordingly, are pro forma presentations.

(5) As adjusted to reflect the application of the net proceeds of this
offering, estimated to be $__________.

(6) Cash and investments includes cash, cash equivalents and short- and
long-term investments.

(7) As of December 1996, $18.0 million of borrowings were allocated to GTR
under Genzyme's $225.0 million revolving credit facility to fund
operations, all of which remained outstanding as of June 30, 1997.

(8) On February 28, 1997, GTR raised $13 million through the private placement
of the GTR Note to an affiliate of Credit Suisse First Boston Corporation.
The GTR Note is convertible into shares of GTR Stock at a discount to the
average of the closing bid prices of GTR Stock as reported by the Nasdaq
National Market for the 25 trading days immediately preceding the
applicable conversion date (the "Conversion Price"). This discount began at
2% on August 27, 1997 and increases by an additional one percent per month
thereafter until May 27, 1998. After May 27, 1998, the Conversion Price
will be equal to the lesser of: (i) 89% of the Conversion Price calculated
as of the actual conversion date and (ii) 89% of the Conversion Price
calculated as of May 27, 1998. In the first quarter of 1997, GTR recorded
$11.5 million of proceeds attributed to the value of the debt and
$1.5 million attributed to the value of the conversion feature (recorded
as an increase to division equity). The $11.5 million will be accreted to
the face value of the debt by a charge to interest expense over the term
of the initial 15 month conversion period.

(9) In December 1994, the outstanding shares of Genzyme common stock were
redesignated as GGD Stock on a share-for-share basis and shares of GTR
Stock were distributed on the basis of .135 of one share of GTR Stock for
each share of Genzyme's previous common stock held by shareholders of
record on December 16, 1994. In December 1994, Genzyme issued 5,000,000
shares of GTR Stock valued at $25.3 million in connection with the
acquisition of BioSurface. In September 1995, GTR completed the sale of
3,000,000 shares of GTR Stock for net proceeds of $42.3 million. In each of
June 1996 and June 1997, GTR received $10 million from Genzyme General in
exchange for 1,000,000 GTR Designated Shares issued pursuant to the terms
of the purchase option agreement between Genzyme General and GTR.

<PAGE> 22

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

RESULTS OF OPERATIONS

FIRST SIX MONTHS OF 1997 AS COMPARED TO THE FIRST SIX MONTHS OF 1996

REVENUES: Service revenues for the six months ended June 30, 1997 were
$4.6 million, an increase of 38% over the same period in 1996. Sales of
Carticel(TM) ACC were $2.7 million for the six months ended June 30, 1997 as
compared to $1.3 million for the comparable period in 1996. The growth in
Carticel(TM) ACC sales is primarily attributable to increased acceptance of the
service by surgeons and a continued increase in the number of surgeons trained
in the procedure utilizing the service. Sales of the Epicel(SM) Service were
$1.9 million for the six months ended June 30, 1997 compared to $2.0 million for
the same period in 1996 due to a decrease in the number of burn incidents
requiring the service.

MARGINS AND OPERATING EXPENSES: GTR's cost of services sold exceeded revenue for
the six months ended June 30, 1997 by $1.4 million, compared to $2.5 million for
the same period in 1996 primarily due to the higher sales volume and
efficiencies gained in the manufacturing process.

Selling, general and administrative ("SG&A") expenses were $12.7 million
for the six months ended June 30, 1997, a decrease of 2% over the same period in
1996. GTR incurs direct SG&A charges as well as an SG&A charge based on actual
amounts incurred from Genzyme General for SG&A work performed by Genzyme General
on behalf of GTR. For the six months ended June 30, 1997, $4.1 million of SG&A
services were provided by Genzyme General as compared to $4.3 million for the
same period in 1996.

Research and development expenses were $5.0 million for the six months
ended June 30, 1997 as compared to $4.7 million for the same period in 1996.
Increased spending associated with the BLA for Carticel(TM) ACC was offset by a
decline in costs related to the Vianain(R) program. For the six months ended
June 30, 1997, $3.7 million of research and development services were provided
to GTR by Genzyme General, compared to $3.3 million in the corresponding period
of 1996.

OTHER INCOME AND EXPENSES: Investment income declined to $0.4 million for the
six months ended June 30, 1997 from $1.0 million in the same period in 1996, due
primarily to lower average cash balances.

Interest expense for the six months ended June 30, 1997 increased to
$1.2 million as a result of a 20% increase in borrowings under Genzyme's
revolving credit facility as compared to June 30, 1996, and the addition of
$11.5 million of debt from the private placement of the GTR Note. See
"Liquidity and Capital Resources" below.

On October 1, 1996, Diacrin/Genzyme LLC was established as a joint venture
between GTR and Diacrin to develop and commercialize products and processes
using fetal porcine cells for the treatment of Parkinson's disease and
Huntington's disease in humans. Under the terms of the joint venture agreement,
GTR is required to provide 80% of the first $50 million in funding for products
to be developed by the joint venture. Thereafter, all costs will be shared
equally between GTR and Diacrin. Profits from the joint venture will be shared
by the two parties. In the six months ended June 30, 1997, GTR provided
$4.1 million of funding to, and realized a net loss of $3.4 million from,
Diacrin/Genzyme LLC.

1996 AS COMPARED TO 1995

REVENUES: Revenues in 1996 increased 40% to $7.3 million from $5.2 million in
1995. Sales of Carticel(TM) ACC were $3.1 million, compared to $0.6 million in
1995, the year in which the service was launched. The increase in Carticel(TM)
ACC sales resulted primarily from the increase in the number of surgeons
trained in the

<PAGE> 23

procedure utilizing the service. Sales of the Epicel(SM) Service in 1996
decreased 9% to $4.2 million, due to a decrease in the number of burn incidents
requiring the service.

MARGINS AND OPERATING EXPENSES: GTR's costs of services sold exceeded revenues
by 53% in 1996, compared to a gross profit of 9% in 1995, due to increased
spending for the expansion of manufacturing capacity.

SG&A expenses in 1996 were $27.1 million, an increase of 110% over 1995.
The increase resulted from the expenses and staffing to support revenue growth
and increased surgeon training costs relating to Carticel(TM) ACC. GTR incurs
direct SG&A expenses as well as an SG&A charge, based on actual amounts
incurred, from Genzyme General for SG&A work performed by Genzyme General on
behalf of GTR. In 1996, $9.1 million of SG&A services were provided by Genzyme
General, compared to $4.4 million in 1995, due to an increase in the level of
operations related to Carticel(TM) ACC.

Research and development expenses were $10.9 million in each of 1996 and
1995. Increases in expenses associated with the TGF-(beta)2 program were offset
by decreases in the Vianain(R) program. In 1996, $6.9 million of research and
development services were provided by Genzyme General to GTR, compared to $4.7
million in 1995.

OTHER INCOME AND EXPENSES: Investment income was $1.4 million in each of 1996
and 1995, due primarily to level average cash balances during the year. Interest
expense in 1996 was $0.1 million, net of capitalized interest on construction in
progress of $0.2 million, compared to $40,000 in 1995. Interest expense
increased in 1996 due to interest on borrowings. See "Liquidity and Capital
Resources" for a description of the borrowings.

As of December 31, 1996, GTR had provided $1.9 million of funding to
Diacrin/Genzyme LLC and realized a net loss of $1.7 million from the joint
venture.

1995 AS COMPARED TO 1994

REVENUES: Revenues for 1995 were $5.2 million compared to $0.3 million in 1994.
Revenues in 1994 consisted solely of revenues from the sale of the Epicel(SM)
Service for the period from December 16, 1994, the acquisition date of
BioSurface, through December 31, 1994. Revenues for 1995 consisted primarily of
$4.6 million in sales of the Epicel(SM) Service and $0.6 million from sales of
Carticel(TM) ACC.

MARGINS AND OPERATING EXPENSES: Gross margins decreased to 9% in 1995 from 11%
in 1994 due to costs associated with the launch of Carticel(TM) ACC. SG&A
expenses for 1995 were $12.9 million, compared to $1.0 million in 1994 comprised
solely of expenses from BioSurface. In 1995, $4.4 million of SG&A services were
provided by Genzyme General to GTR compared to $0.8 million in 1994. The
increases in SG&A expenses and services provided by Genzyme General were due to
a full year of operations from BioSurface and to the launch in both the U.S. and
Europe of Carticel(TM) ACC.

Research and development expenses for 1995 were $10.9 million compared to
$3.6 million in 1994, which included $0.3 million from the operations of
BioSurface. The increase resulted from accelerated clinical trials activity for
certain tissue repair products and increased efforts relating to Carticel(TM)
ACC. In 1995, $4.7 million of research and development services were provided by
Genzyme General to GTR compared to $3.3 million in 1994.

OTHER INCOME AND EXPENSES: Investment income for 1995 was $1.4 million compared
to $29,000 for 1994. The increase over 1994 was due to higher average cash
balances from the allocation of $10 million from Genzyme General and the net
proceeds from a public offering in October 1995. In 1994, $11.2 million of
incomplete technology from the BioSurface acquisition was charged to operations
as in-process research and development.

LIQUIDITY AND FINANCIAL RESOURCES

<PAGE> 24

As of June 30, 1997, GTR had cash and cash equivalents of $20.9 million,
an increase of $4.7 million from December 31, 1996. GTR used $18.9 million of
cash for operations in the six months ended June 30, 1997. Investing activities
used $4.6 million of cash in the six months ended June 30, 1997, of which
$4.1 million represents GTR's additional investment in Diacrin/Genzyme LLC and
$0.5 million represents investments in other noncurrent assets. These
expenditures were financed primarily by $14.0 million of cash allocated to GTR
from Genzyme General, of which $10.0 million represented cash allocated pursuant
to Genzyme General's remaining option to allocate up to $20.0 million of cash to
GTR in exchange for GTR Designated Shares at $10 per share and $4.1 million
represented cash allocated to GTR to fund its investment in Diacrin/Genzyme LLC
and $13.0 million of proceeds from the private placement of the GTR Note in
February 1997. Of the $13.0 million in proceeds from the GTR Note, GTR recorded
$11.5 million of proceeds attributable to the value of the debt and $1.5 million
attributable to the value of the conversion feature (recorded as an increase to
division equity). The $11.5 million will be accreted to the face value of the
debt by a charge to interest expense over the term of the initial 15 month
conversion period. Proceeds from the issuance of common stock through exercises
of stock options and warrants contributed $1.1 million in the six months ended
June 30, 1997 and as of June 30, 1997, $18.0 million of funds borrowed by GTR in
December 1996 under Genzyme's revolving credit facility remained outstanding.

GTR's funding obligation to Diacrin/Genzyme LLC for 1997 is expected to be
approximately $10 million, of which $4.1 million had been provided by GTR as of
June 30, 1997. GTR's funding obligation to the joint venture for 1998 is
expected to be approximately $10 million.

GTR anticipates that the net proceeds from this offering, together with
existing cash balances allocated to GTR or approved for reallocation from
Genzyme General and cash generated from the sale of Carticel(TM) ACC and the
Epicel(SM) Service, will be sufficient to fund GTR's operations through the end
of 1998. Significant additional funds may be required to continue operations at
anticipated levels beyond 1998, however, and GTR may be required to delay, scale
back or eliminate certain of its programs or to license third parties to
commercialize technologies or products that it would otherwise undertake itself
if it does not have sufficient capital or is not successful in raising
additional capital.

<PAGE> 25

ADDITIONAL FINANCIAL DATA

Genzyme holds title to all of its assets and is responsible for all of its
liabilities, and the holders of GTR Stock have no specific claim against the
assets attributed for financial statement presentation purposes to GTR.
Liabilities or contingencies of any division that affect Genzyme's resources or
financial condition could affect the financial condition or results of
operations of all divisions. See "Risk Factors - Risks Related to Genzyme
Tracking Stock - Stockholders of One Company; Financial Impacts on One Division
Could Affect the Others." Therefore, the following consolidated balance sheet
data of Genzyme are presented as additional information.

The following table represents summary historical consolidated balance
sheet data of Genzyme as derived from Genzyme's financial statements. The data
should be read in conjunction with the historical financial statements and the
notes thereto, and related Management's Discussion and Analysis of Financial
Condition and Results of Operations of Genzyme incorporated by reference in this
Prospectus. See "Incorporation of Certain Documents by Reference." Amounts are
in thousands, except for per share amounts.

<TABLE>
<CAPTION>
AT DECEMBER 31, AT JUNE 30,
------------------------------------------------------------ -----------
1992 1993 1994 1995 1996 1997
-------- -------- -------- -------- ---------- -----------
<S> <C> <C> <C> <C> <C> <C>
CONSOLIDATED BALANCE SHEET DATA:
Cash and investments (1)...................... $248,325 $168,953 $153,460 $326,236 $ 187,955 $ 178,957
Working capital............................... 166,324 99,605 103,871 352,410 395,605 330,145
Total assets (2).............................. 481,896 542,052 658,408 905,201 1,270,508 1,223,987
Long-term debt and capital lease obligations
excluding current portion (2, 3, 4, 5)....... 105,369 144,674 126,729 124,473 241,998 158,314
Stockholders' equity (2, 4, 5, 6)............. 322,613 334,072 418,964 705,207 902,309 949,305
</TABLE>

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

(1) Cash and investments includes cash, cash equivalents and short- and
long-term investments.

(2) In May 1996, Genzyme acquired Genetrix, Inc. in a tax-free exchange of
GGD Stock which was accounted for as a purchase. In the aggregate,
approximately 1,380,000 shares of GGD Stock valued at $36.5 million were
issued. In July 1996, Genzyme acquired Deknatel Snowden Pencer, Inc.
("DSP") for cash of approximately $252 million financed by cash of $52
million and line of credit borrowings of $200 million. In December 1996,
Genzyme completed the acquisition of all of the callable common stock of
Neozyme II Corporation for $111.3 million in cash.

(3) In June 1996, Genzyme's $15.0 million credit line with a commercial bank
was increased to $215 million in connection with the acquisition of DSP.
In November 1996, this credit line was refinanced with a $225 million
revolving credit facility made available through a syndicate of banks.
As of June 30, 1997, Genzyme had outstanding debt of $118 million under
this credit facility, of which $95 million was allocated to Genzyme
General, $18 million was allocated to GTR and $5 million was allocated
to GMO. Amounts borrowed under this facility are due November 15, 1999.
In July 1996, Genzyme made a final payment of approximately $7.6 million
for a company acquired in 1994.

(4) In October 1991, Genzyme issued $100 million of 6 3/4% convertible
subordinated notes due October 2001 and received net proceeds of
$97.3 million. The notes were converted into shares of GGD Stock in
March 1996.

(5) On February 28, 1997, GTR raised $13 million through the private
placement of the GTR Note to an affiliate of Credit Suisse First Boston
Corporation. The GTR Note is convertible into shares of GTR Stock at a
discount to the average of the closing bid prices of GTR Stock as
reported by the Nasdaq National Market for the 25 trading days
immediately preceding the applicable conversion date (the "Conversion
Price"). This discount began at 2% on August 27, 1997 and increases by
an additional one percent per month thereafter until May 27, 1998. After
May 27, 1998, the Conversion Price will be equal to the lesser of: (i)
89% of the Conversion Price calculated as of the actual conversion date
and (ii) 89% of the Conversion Price calculated as of May 27, 1998. In
the first quarter of 1997, GTR recorded $11.5 million of proceeds
attributed to the value of the debt and $1.5 million attributed to the
value of the conversion feature (recorded as an increase to division
equity). The $11.5 million will be accreted to the face value of the
debt by a charge to interest expense over the term of the initial 15
month conversion period.

(6) On June 18, 1997, PharmaGenics, Inc. merged with and into Genzyme. As
consideration for the merger, the stockholders of PharmaGenics received
approximately 3,929,000 shares of GMO Stock. The aggregate purchase
price was $27.5 million plus estimated acquisition costs of $2.2 million,
assumed liabilities of $5.4 million and the recording of a deferred tax
liability of $7.6 million resulting from the temporary difference between
the book and tax basis of the completed technology. The portion of the
purchase price allocated to the completed technology was $20.0 million
which will be amortized over five years. GMO allocated $7.0 million to
in-process technology, which represents the value assigned to
PharmaGenics's programs which are still in the development stage and for
which there is no alternative use. GMO charged the amount allocated to
in-process technology to operations in June 1997, the period in which the
merger was consummated. As compensation to Genzyme General for its
contributions to GMO, 6,000,000 GMO Designated Shares have been reserved
for issuance for the benefit of Genzyme General or its stockholders.

<PAGE> 26

BUSINESS

OVERVIEW

GTR is a leading developer of biological products for the surgical repair
or replacement of damaged tissue. GTR's lead product, Carticel(TM) ACC for
repair of damaged knee cartilage, has been marketed since 1995 in the U.S. and
Europe as an unregulated device and in August 1997 became the first product to
receive FDA approval under new regulations relating to manipulated autologous
structural cell-based products. GTR expects that this approval will facilitate
the development of broader reimbursement coverage for the product. GTR also
markets the Epicel(SM) Service, which provides cultured autologous skin cells as
permanent skin replacement for patients with severe burns.

GTR is developing two cellular therapies for neurodegenerative diseases --
NeuroCell(TM)-PD for the treatment of Parkinson's disease and NeuroCell(TM)-HD
for the treatment of Huntington's disease. These products involve implantation
of fetal porcine brain cells into Parkinson's and Huntington's disease patients
to replace damaged brain tissue. The NeuroCell(TM) products are being developed
in a joint venture with Diacrin and are currently in Phase I clinical trials.

GTR's development portfolio includes an ongoing Phase II clinical trial of
TGF-(beta)2 for the treatment of chronic skin ulcers as well as research into
improved methods of repairing and replacing cartilage and skin. GTR's strategy
is to use its expertise in cell processing, therapeutic protein development and
biomaterials engineering to develop and sell a portfolio of novel products and
services for unmet medical needs in the orthopedic, neurology and wound closure
markets. GTR believes that, as a division of Genzyme, its ability to pursue this
strategy is enhanced through its access to Genzyme's infrastructure.

DESCRIPTION OF PRODUCTS AND SERVICES

CARTILAGE REPAIR - Carticel(TM) ACC

Background and Market Opportunity

Cartilage tissue consists of cells called chondrocytes, which secrete and
are embedded in a protein and carbohydrate based matrix. There are two types of
cartilage: hyaline and fibrous. Hyaline (also known as articular) cartilage is
the shiny white tissue that lines the ends of bones to provide the almost
frictionless motion of the various joints in the human body. Fibrous cartilage
serves a shock-absorbing function in the knee and in the spine between the
vertebrae. When articular cartilage tissue in a joint is damaged, it does not
regenerate and may further deteriorate over time. Even damage that creates a
small defect in articular cartilage can impair joint movement, restrict mobility
and cause pain and joint locking. Over time, chronic injuries to articular
cartilage may lead to debilitating osteoarthritis and can severely hinder a
person's ability to engage in the activities of daily living.

Many patients with articular cartilage damage undergo surgery to smooth
the surface of the damaged area and to remove loose fragments of cartilage in an
attempt to alleviate pain and swelling. Other common surgical procedures, such
as microfracture, drilling and abrasion, allow bone marrow cells to infiltrate
the defect, resulting in the formation of fibrous cartilage, which is less
durable and resilient than articular cartilage and often does not allow for
smooth joint movement. These procedures may provide only temporary relief,
especially if the patient's pre-injury activity level is maintained. More severe
and chronic forms of knee cartilage damage can lead to greater deterioration of
the joint cartilage and may eventually require total knee joint replacement.

GTR believes there is a significant market opportunity to improve the
clinical outcomes for patients with articular cartilage damage in the knee.
Based on a review of existing literature and physician surveys conducted
by GTR, GTR estimates that approximately 41% of patients undergoing common
treatments for damaged articular knee cartilage will seek further treatment
within one year. Approximately 80% of patients treated with

<PAGE> 27

existing therapies such as those noted above are expected to have poor outcomes
ten years after treatment, including 26% who will have undergone extensive
additional surgeries such as total knee replacement.

In 1994, there were an estimated 1.3 million procedures performed in the
U.S. to treat soft tissue damage in the knee, including articular cartilage,
ligaments and menisci. Of these, approximately 189,000 involved a diagnosis or
treatment of clinically significant articular cartilage defects in patients
between the ages of 14 and 54. GTR believes that at least half of these defects
were located on the femoral condyle (the lower end of the thigh bone), which is
the area of the knee for which use of Carticel(TM) ACC has been approved by the
FDA. Based on its experience to date, GTR estimates that the European market for
cartilage repair is similar in size to the U.S. market.

Description of Carticel(TM) ACC

GTR employs a proprietary process to grow a patient's own ("autologous")
cartilage cells for use in repairing damaged knee cartilage. This process
begins when an orthopedic surgeon provides GTR with a biopsy of healthy
cartilage taken arthroscopically from the patient. Technicians at GTR's cell
processing facilities in Cambridge and Framingham, Massachusetts use
proprietary methods to grow new cartilage cells from the sample for that
patient over a period of 21 days. In vitro studies have shown that this process
allows the cartilage cells to multiply while retaining their ability to form
hyaline cartilage. If necessary during the cell culturing process, GTR can
freeze and store the patient's cells for up to 24 months. Upon scheduling of
the implantation procedure by the surgeon, the cells are then delivered to the
hospital, where the surgeon implants them into the defect. In this procedure,
known as autologous chondrocyte implantation ("ACI"), the surgeon removes
damaged tissue and prepares the defect for introduction of the cultured cells.
A small piece of periosteum, the membrane that covers bone, is taken from the
patient's lower leg and sutured over the defect to hold the cells in place. The
cultured cells are then implanted under the periosteum.

The following figure indicates the steps required to implant autologous
cartilage cells:

[The graphic image that appears here consists of four numbered
illustrations. The first illustration shows the structure of the
human knee and an articular cartilage defect depicted with a dark
circle labeled "defect". It is captioned "Healthy cartilage biopsy
taken from patient." There is a line leading from this caption to
the area in the knee from which the cartilage biopsy is taken. The
second illustration, captioned "Biopsy sent to GTR for processing,"
portrays a technician examining a biopsy through a microscope. The
next segment is a drawing of cells in a test tube with a caption
"Cultured cells sent to surgeon." The final segment shows an
illustration of a knee with a periosteal flap sutured on top of the
defect and a syringe inserted underneath the periosteal flap from
the perimeter. This illustration is captioned "Cultured cartilage
cells injected under periosteal flap." There is also a caption to
this illustration which says "periosteal flap, taken from lower leg
bone and sutured on top of defect" and a line indicating the flap
sutured over the area of the defect.]

STEP 1: ARTHROSCOPIC BIOPSY PROCEDURE. The initial surgical
procedure is an arthroscopy. If the physician diagnoses an articular
cartilage defect, he or she will perform a biopsy procedure to
retrieve a tiny sample of healthy cartilage tissue.
STEP 2: BIOPSY PROCESSING AND CELL CULTURING. The biopsy tissue is
then sent to the specialized processing facility at GTR. Under
strict aseptic conditions, the cartilage cells from the biopsy are
nourished and grown in culture. Cell culturing usually requires
approximately three weeks, during which time the cartilage cells
will grow to many times their original number. Following culturing,
the cells will be ready for return to the physician for a scheduled
surgical implantation.
STEPS 3 & 4: SURGICAL IMPLANTATION. To complete the implantation
process, a second surgical procedure is performed. An incision is
made in the knee and the joint is opened. Damaged cartilage tissue
is removed, and the area of the defect is prepared to receive the
cultured cells. Another small

<PAGE> 28

incision is then made over the tibia (shin bone) to remove a piece
of periosteum, the thin tissue which covers the bone. The periosteum
is sutured over the cartilage defect to serve as a protective cover
for the cells which are implanted beneath it.

In addition to cartilage cell processing, GTR trains orthopedic surgeons,
collects and analyzes outcomes data and assists physicians and patients in
obtaining reimbursements from third party payers.

Surgeon Training

GTR's comprehensive surgeon training program consists of lectures and
hands-on bioskills sessions involving practice of the surgical procedures
(including biopsy harvesting, implantation and surgical follow up), as well as
an orientation on reimbursement and billing procedures. GTR conducts physician
training at its facilities in Cambridge, Massachusetts and Naarden, the
Netherlands and has begun to conduct surgeon training in conjunction with
academic institutions in the U.S. and Europe. As of June 30, 1997, GTR had
trained 1,086 surgeons in the U.S. and 622 surgeons in Europe.

Clinical Results

A substantial body of clinical data supports the safety and efficacy of
ACI. The ACI procedure was initially developed by GTR's exclusive collaborators
at the University of Gotenburg and Sahlgrenska University Hospital in Gotenburg,
Sweden. The Swedish group published its initial clinical data regarding ACI in
the October 6, 1994 edition of the New England Journal of Medicine. That article
reported that 19 of the first 23 patients with damaged articular cartilage in
the knee had restored or improved joint function at least two years after
treatment with the ACI procedure, based on the surgeon's evaluation of the
patient's overall knee condition.

Since initiating the clinical use of ACI in Sweden in October 1987, the
Swedish group has treated over 400 patients with the procedure. The clinical
outcomes of these patients provide a substantial resource for evaluating the
safety and efficacy of the procedure. These data were not collected through a
protocol established in advance of treatment and therefore the exact type and
amount of follow-up data available on each patient varies. In addition to the
400 patients treated in Sweden, more than 600 patients had been treated in the
U.S. and Europe with Carticel(TM) ACC as of June 30, 1997. In order to document
clinical outcomes of patients treated with Carticel(TM) ACC, GTR has established
a prospective, standardized registry of information on patients treated.

Based on analysis of clinical outcomes from more than 1,000 patients
treated with ACI, GTR believes that it is a safe and effective procedure for the
repair of damaged articular cartilage. GTR also believes that outcomes for
patients treated with Carticel(TM) ACC, unlike those for patients treated with
other therapies, may improve over time, as a result of the continued maturation
of the implanted cartilage cells.

Swedish Outcomes Data - FDA Analysis

As part of the BLA, GTR submitted to the FDA a review of the clinical
outcomes for the first 153 patients treated in Sweden between October 1987 and
May 1995. This review focused on the safety of the procedure and was completed
by an independent clinical research organization. A team of FDA medical
reviewers visited Sweden in November 1996 and conducted an independent
evaluation of the data from this series of patients.

The FDA's analysis included 52 of the 153 patients. Patients included in
the review had received treatment for cartilage defects on the femoral condyle
(with and without simultaneous treatment of a damaged anterior cruciate ligament
("ACL")) or as a result of osteochondritis dissecans ("OCD"), a separation of
bone and cartilage fragments from the surface of the knee joint. The median
follow-up period for this analysis was 25 months, with a range of 18 to 94
months. The FDA reviewers assigned each patient to one of three outcome
categories -- "resumed all activities," "some improvement" or "no improvement"
- -- based on a review of self-assessment questionnaires completed by the patient
or, if a questionnaire was not available, the reviewers' own

<PAGE> 29

interpretation of supporting medical documents. The reviewers' assessment
focused on a comparison of the patient's condition prior to surgery with that at
the time of evaluation. Patients whose cartilage defects were located in other
areas of the knee, who had cartilage defects in multiple locations or whose
outcomes were judged by the reviewers to be "unknown" or "unevaluable" were
excluded from this analysis. A total of 73% of the 52 patients included in the
FDA analysis showed at least some improvement according to the medical
reviewer's grading system. The following table summarizes the results of the FDA
medical reviewers' analysis:

<TABLE>
<CAPTION>
CLINICAL OUTCOME
----------------------------------------------
Resumed All Some
Indication Activities Improvement No Improvement Total
---------- ----------- ----------- -------------- -----
<S> <C> <C> <C> <C>
Femoral condyle 7 (29%) 8 (33%) 9 (38%) 24

Femoral condyle with ACL 4 (25%) 9 (56%) 3 (19%) 16
--

OCD 6 (50%) 4 (33%) 2 (17%) 12
------- ------- --------

TOTAL 17 (33%) 21 (40%) 14 (27%) 52
</TABLE>

The reviewers also noted that there appeared to be some association
between those patients who demonstrated complete or substantial filling of the
defect upon arthroscopic examination and those patients whose functional
outcomes were categorized as "resumed all activities" or "some improvement."

Swedish Outcomes Data - Collaborators' Analysis

GTR's exclusive Swedish collaborators, Lars Peterson, M.D., Ph.D. and
Anders Lindahl, M.D., Ph.D., conducted additional analyses of long-term outcomes
from ACI, which were presented at a meeting of the American Academy of
Orthopedic Surgeons in February 1997. This presentation reported the results of
a study of 92 of the first 100 patients treated with ACI in Sweden who had
reached at least a two-year follow-up. The study included data on some patients
for whom clinical follow-up was completed in December 1996 (after the FDA
medical reviewers completed their review).

Of the 92 patients studied, 59 had defects on the femoral condyle (with
and without simultaneous treatment of a damaged ACL) or as a result of OCD. The
median time of follow-up was 34 months, with a range from 26 to 107 months. The
results of this study showed that 96% of those patients with a single defect on
the femoral condyle were judged by the surgeon to have had good to excellent
results based on an assessment of five different established knee outcome rating
scales. A retrospective analysis of the medical records of the patients in this
study, using the five rating scales, revealed that prior to treatment with the
ACI procedure their knees were, on average, in poor condition. The results of
this evaluation are tabulated below.

<TABLE>
<CAPTION>
Indication Number Of Patients Clinical Assessment
---------- ------------------ -------------------
<S> <C> <C>
Femoral condyle 24 23 (96%) Good/Excellent

Femoral condyle with ACL 16 12 (75%) Good/Excellent

OCD 19 17 (89%) Good/Excellent
-- -----------------------

TOTAL 59 52 (88%) Good/Excellent
</TABLE>

<PAGE> 30

As part of this study, Dr. Peterson and his colleagues took 25 biopsies of
the ACI grafts from 14 out of the 92 patients. The examination revealed that 13
of the 25 biopsies (from 12 of the 14 patients) were composed of hyaline-like
cartilage (similar to the kind normally found on joint surfaces) with a surface
layer of fibrous cartilage (believed to be the remnants of periosteum that was
used to hold the autologous cells in place). Six biopsies were composed of a
combination of hyaline-like and fibrous cartilage, and the remaining six
biopsies were composed solely of fibrous cartilage. At the February 1997
meeting, Dr. Peterson expressed his belief that the existence of hyaline-like
repair tissue was associated with improved clinical outcomes, while the
existence of fibrous repair tissue was associated with poor outcomes.
Additional data will need to be collected to prove the statistical validity of
a correlation between histology and clinical outcomes.

Carticel(TM) ACC Registry and Outcomes Data

In order to document clinical outcomes of patients treated with
Carticel(TM) ACC, GTR has established a prospective, standardized registry of
information on patients treated. Demographic data on each patient as well as
clinician and patient evaluations of overall knee condition and symptomatology
are collected at the time of initial diagnosis (pre-treatment), at the time of
chondrocyte implantation, at six months post-implantation and then annually
starting at 12 months post-treatment. The registry also includes data on adverse
events. All outcomes data collection is coordinated by an independent clinical
research firm.

Reports of results from the registry are generated twice each year and are
reviewed by an independent board of orthopedic surgeons. Each surgeon who
participates in the registry program receives a summary of his or her own
patients' outcomes as well as a summary of the aggregate outcomes of all
patients in the registry.

At a meeting of the American Orthopaedic Society for Sports Medicine held
in June 1997, a member of GTR's independent board of orthopedic surgeons
presented data from the third periodic registry report. The report included
analysis on 84 patients who had been treated more than 12 months prior to the
time of data collection and 191 patients who had been treated at least six
months prior to data collection. These patients had defects on the femoral
condyle as well as on other locations in the knee. The report reflects
participation by approximately 80% of eligible surgeons and patients. Prior to
treatment with Carticel(TM) ACC, more than 75% of patients in the report had
failed to improve following one or more prior attempts at cartilage repair
using traditional techniques. Approximately 32% had undergone three or more
prior cartilage repair procedures.

Comparison of mean patient outcomes at six and 12 months post-treatment to
baseline condition showed statistically significant improvement at both six
months and 12 months following treatment with Carticel(TM) ACC. Mean overall
patient condition was judged to have improved significantly between the
six month and 12 month evaluations by both clinician and patient. These
improvements were seen in four key measures: clinician and patient evaluations
of overall knee condition, patient reported pain and knee examination results
(swelling in the knee).

The following table summarizes assessments of overall patient condition by
the clinician and patient at 12 months compared to such patients' condition
before surgery, for the patients in the registry for whom such data were
available:

<TABLE>
<CAPTION>
Clinician's Evaluation Patient's Evaluation
--------------------------------------- ---------------------------------------
Indication Improvement No Change Worsening Improvement No Change Worsening
---------- ----------- --------- --------- ----------- --------- ---------
<S> <C> <C> <C> <C> <C> <C>
Femoral condyle 49 (82%) 8 (13%) 3 (5%) 54 (89%) 2 (3%) 5 (8%)

Other locations
in knee 16 (76%) 4 (19%) 1 (5%) 16 (76%) 1 (5%) 4 (19%)
</TABLE>

<PAGE> 31

As of June 30, 1997, 631 patients had been treated worldwide with
Carticel(TM) ACC. Eighty eight percent (88%) of patients reported no
complications, and less than 5% reported adverse events determined by the
surgeons to be at least possibly related to treatment with Carticel(TM) ACC.
The most frequently reported adverse events were "overgrown" tissue at the site
of the cartilage repair, adhesions, superficial wound infection, inflammation
of membranes in the joint and post-operative bruising.

Commercial Results in the U.S.

In 1995, when GTR began marketing Carticel(TM) ACC, autologous cell
products were not regulated by the FDA. GTR believes that the absence of
regulatory approval has limited broader policy coverage of the product since
reimbursement authorities and insurance companies often require regulatory
approval prior to providing reimbursement coverage. Prior to receipt of FDA
approval to market Carticel(TM) ACC in August 1997, GTR's revenues from the
product have been largely dependent on GTR's ability to obtain insurance
authorizations on an individual patient basis.

As of June 30, 1997, approximately 50% of the 1,086 surgeons trained in
the therapeutic use of Carticel(TM) ACC in the U.S. had sent at least one
patient biopsy to GTR for processing and had initiated a request for insurance
coverage. As of such date, approximately 16% of trained U.S. surgeons had
subsequently performed their first patient treatment with Carticel(TM) ACC.
Surgeon surveys indicate that the primary barrier to patient treatment is the
difficulty experienced to date in obtaining reimbursement.

As of June 30, 1997, trained surgeons in the U.S. had identified over
2,800 patients whose cartilage injuries are potentially treatable with
Carticel(TM) ACC and had sent cartilage biopsies from 2,294 of these patients to
GTR for processing. Of the patients from whom biopsies were taken, approximately
502 had been treated and over 400 were known by GTR to be seeking treatment as
of June 30, 1997. GTR believes the remainder of these patients may have either
been treated with an alternative method, were asymptomatic or were not seeking
treatment due to the difficulty in obtaining reimbursement.

Through June 30, 1997, GTR had received approximately $5.1 million in
revenues from U.S. sales of Carticel(TM) ACC since its market introduction in
March 1995.

The following table summarizes the early results of the commercialization
of Carticel(TM) ACC in the U.S.:

<TABLE>
<CAPTION>
At December 31, At December 31, At June 30,
1995 1996 1997
--------------- --------------- -----------
<S> <C> <C> <C>
Biopsies performed 253 1,511 2,294
Completed patient treatments 60 311 502
Coverage approvals 72 373 587
</TABLE>

Commercial Results in Europe

GTR also markets Carticel(TM) ACC in eight countries in Europe. To support
its sales efforts in Europe, GTR has nine European employees engaged in medical
marketing, surgeon training and medical and regulatory affairs. As of June 30,
1997, GTR had trained 622 surgeons in the therapeutic use of Carticel(TM) ACC
and 129 patients in Europe had been treated with the product. To date, Germany,
Scandinavia and Spain have represented the largest markets for Carticel(TM) ACC
in Europe.

Unlike the U.S., the European Union has no regulatory structure for
manipulated autologous cells and GTR has not encountered to date any
registration requirements for market introduction of Carticel(TM) ACC in
individual countries. See "Government Regulation and FDA Approval" below. As in
the U.S., however, utilization of Carticel(TM) ACC in Europe has been largely
dependent on GTR's ability to obtain appropriate

<PAGE> 32

reimbursement coverage for the product, which is based on decisions made by
individual government controlled or regulated health financing authorities. Due
to the absence of a regulatory structure for Carticel(TM) ACC in Europe, GTR is
currently engaged in a series of discussions with these authorities regarding
reimbursement coverage for the product. GTR believes that regulatory approval of
Carticel(TM) ACC in the U.S. and the availability of additional outcomes data
from patients treated with the product will facilitate the development of
broader reimbursement coverage and utilization of Carticel(TM) ACC in Europe.

Government Regulation and FDA Approval

Based on discussions with the FDA's Center for Devices and Radiological
Health, GTR introduced Carticel(TM) ACC in March 1995 as an unregulated device.
In the absence of specific regulation, GTR operated under a self-imposed set of
rigorous quality standards for autologous cell culturing services. These
standards included internal and external assessments of the manufacturing and
quality system.

In May 1996, the FDA published a new guidance document that provided for
the regulation of products such as Carticel(TM) ACC that use manipulated
autologous structural cells. GTR submitted a BLA for Carticel(TM) ACC in March
1996 in anticipation of the regulations.

During late 1996, the FDA conducted a thorough review of the Swedish
clinical data that formed the basis for GTR's BLA for Carticel(TM) ACC. In March
1997, an FDA advisory panel determined by a vote of 11 to zero, with one
abstention, that the ACI procedure using Carticel(TM) ACC provided a clinical
benefit to patients with damage to the articular cartilage in the knee.

In August 1997, the FDA granted GTR a biologics license for the
manufacture of Carticel(TM) ACC for use in repairing clinically significant
cartilage defects of the femoral condyle. Carticel(TM) ACC is not indicated for
the treatment of cartilage damage associated with osteoarthritis.

This license is the first and, to date, the only biologics license granted
by the FDA under the new regulations relating to manipulated autologous
structural cells, and represents the culmination of a two-year effort by GTR
working with the FDA to develop an appropriate regulatory framework for
Carticel(TM) ACC. Under these regulations, companies that are not currently
marketing autologous cultured chondrocytes would likely be required to provide
a prospective randomized blinded control study comparing the treatment to
alternative treatments. GTR estimates that it could take eight years for any
competitor to complete a study of this nature that would demonstrate the
clinical efficacy of its proposed treatment. As a result of the new FDA
regulations for manipulated autologous cells, GTR believes that it is
substantially ahead of its competition in introducing ACI products for repair
of articular cartilage defects to the market.

GTR is also required by the FDA to conduct two confirmatory post-marketing
studies to gain a better understanding of the role of implanted cells in ACI and
to assess longer term clinical results. Each of these studies is required to
demonstrate that Carticel(TM) ACC is superior to the alternatives studied. The
first, a five year, randomized study, will compare outcomes of patients treated
with Carticel(TM) ACC to those of patients treated with abrasion and
microfracture B two common alternative treatments for articular cartilage
defects. Approximately 300 patients will be evaluated in the study at 15 to 20
sites in the U.S. The study is expected to begin by the end of 1997 and be
completed in 2003. The second study will be a smaller scale study in which
patients will undergo the ACI biopsy and implantation procedure, but will
randomly be assigned to receive either Carticel(TM) ACC or a placebo. This study
is expected to include approximately 80 patients at eight centers and is
targeted to last three to five years, not including a 36-month follow-up.

Autologous products are specifically exempt from the European Device
Directive and Pharmaceutical Directive promulgated by the European Union.
Therefore, each European country is free to impose its own regulations on the
marketing of such products. To date, GTR has not encountered any local
registration requirements for market introduction of Carticel(TM) ACC. GTR is
currently assessing the regulatory requirements for commercialization of
Carticel(TM) ACC in Japan.

<PAGE> 33

Reimbursement

As of June 30, 1997, 286 third party payers in the U.S. had approved at
least one patient treatment with Carticel(TM) ACC. When third party payers have
denied reimbursement for Carticel(TM) ACC, the most frequently cited reason has
been that the product is considered to be "experimental." Although definitions
and criteria vary, a product or procedure is generally defined as experimental
due to the absence of peer reviewed data and/or the lack of FDA approval. GTR
therefore believes the recent approval of Carticel(TM) ACC by the FDA will
facilitate the development of broader reimbursement coverage for the product.

In the first half of 1997, GTR initiated a program to contact and educate
medical policy staffs at U.S. insurance companies. To date, GTR's specialized
sales staff has made substantial contact with over 140 third party payers in the
U.S. Of these, approximately 40 insurance plans, covering approximately 15
million lives, have subsequently granted policy coverage or established
protocols for covering patients treated with Carticel(TM) ACC prior to receipt
of FDA approval. In addition, approximately 40 additional insurers in the U.S.,
covering approximately 80 million lives, have indicated that FDA approval is a
critical step in granting policy or benefit exception coverage of Carticel(TM)
ACC. GTR anticipates that a number of major insurance plans will adopt favorable
policies based on FDA approval alone or in combination with technology
assessments to be conducted by individual insurance plans.

Workers' compensation insurers provide not only medical coverage to
patients but also compensation for lost income due to disability. Since patients
with knee injuries, such as cartilage damage, frequently become functionally
disabled, knee injuries represent a significant source of expenses for these
plans. Treatment with Carticel(TM) ACC has enjoyed a high rate of coverage by
workers' compensation insurance plans. As of June 30, 1997, approximately 93% of
patients seeking coverage for Carticel(TM) ACC in the U.S. had been approved by
this type of payer. GTR is engaged in discussions with several of the largest
workers' compensation plans to develop policy coverage for treatment with
Carticel(TM) ACC and to implement programs to identify patients who may
currently be disabled who could benefit from the product.

Sales and Marketing

Successful commercialization of Carticel(TM) ACC is dependent on its being
accepted by and incorporated into routine use by a large number of orthopedic
surgeons. GTR markets Carticel(TM) ACC directly to orthopedic surgeons in the
U.S. and Europe. GTR's sales and marketing staff devoted to Carticel(TM) ACC in
the U.S. and Europe totals 91 persons. Of these, 26 are field sales
representatives in the U.S., 10 are field sales representatives in Europe and 21
are reimbursement specialists in the U.S. The remainder are engaged in medical
marketing or surgeon training. GTR's sales and marketing staff is drawn from
other orthopedic sales forces, other biotechnology sales forces and third party
payers.

In 1995, there were approximately 16,800 board certified orthopedic
surgeons in the U.S. GTR estimates that half of these surgeons account for over
80% of the treatments performed on soft tissue knee injuries such as the repair
of articular cartilage. GTR's sales force targets those orthopedic surgeons most
likely to use Carticel(TM) ACC by focusing on specific markets. Because
different regions of the U.S. have varying types of third party payers,
physician practices and patient populations, GTR has developed a regionalized
marketing program for its sales force. This allows GTR to make focused regional
efforts to further expand use of Carticel(TM) ACC.

GTR's sales force promotes Carticel(TM) ACC in these markets by contacting
and educating orthopedic surgeons about the service and maintaining an ongoing
relationship with each surgeon who receives training from GTR, assisting
physicians with administrative, clinical and implantation procedures at
hospitals and assisting physicians in obtaining the necessary approval from the
hospital's IRB to collect outcome data in accordance with GTR's protocol. GTR
further supports its sales and marketing efforts by attendance at and
participation in orthopedic congresses and symposia.

<PAGE> 34

Competition

GTR is aware of one other company, Verigen, Inc., that is culturing
autologous chondrocytes for cartilage repair in Europe. In addition to Verigen,
GTR knows of three other companies, Advanced Tissue Sciences, Inc., in
conjunction with Smith & Nephew PLC, Integra LifeSciences Corp. and LifeCell
Corp., that are engaged in research on cultured cartilage products. In addition,
a surgical technique known as osteochondral grafting may be competitive to
Carticel(TM) ACC. This procedure, which can be performed arthroscopically,
involves transferring plugs of low weight bearing cartilage and bone to the area
of a defect. Smith & Nephew, Arthrex, Inc. and Innovasive Devices, Inc. are
known to have programs relating to this procedure. GTR's competitors may have
substantially greater resources than GTR. In addition, these competitors may
develop products and services that are more effective than Carticel(TM) ACC or
which cost less, and they may be more successful than GTR in producing and
marketing their products and services.

Development Programs

GTR currently has a number of ongoing development programs supporting
Carticel(TM) ACC. GTR is conducting basic research and development into the
biology of cartilage and the cartilage repair process. The objective of this
research is to identify biologic materials that promote more rapid regeneration
of articular cartilage, to develop new methods for the repair of arthritic
joints and large surface area cartilage defects and to enable the ACI procedure
to be performed less invasively. GTR is also committing resources to meet
requirements specified by the FDA for validation of certain product
manufacturing parameters.

NEURODEGENERATIVE DISEASES - DIACRIN/GENZYME LLC

In October 1996, Diacrin/Genzyme LLC was established as a joint venture
between GTR and Diacrin to develop and commercialize two cellular therapies for
neurodegenerative diseases -- NeuroCell(TM)-PD for the treatment of Parkinson's
disease and NeuroCell(TM)-HD for the treatment of Huntington's disease. The
NeuroCell(TM) programs involve implantation of fetal porcine brain cells into
Parkinson's and Huntington's disease patients to replace damaged brain tissue
and both are in Phase I clinical trials. Under the terms of the joint venture
agreement, GTR is required to provide $40 million of the first $50 million in
funding for products to be developed by the joint venture. Thereafter, all costs
will be shared equally between GTR and Diacrin. Sales and marketing will be
performed by GTR and the joint venture will be responsible for manufacturing the
products. Profits from the joint venture will be shared equally by the two
parties.

Current transplantation technology generally requires the recipient to be
immunosuppressed in order to prevent graft rejection. With both NeuroCell(TM)
products, GTR believes that rejection of the porcine cells can be prevented with
the commonly used immunosuppressive drug cyclosporin. The joint venture also has
a license to use patented technology developed at Massachusetts General Hospital
in Boston to protect the NeuroCell(TM) products from the host's immune system
without the need for chronic, lifetime administration of immunosuppressive
drugs. In December 1996, the FDA granted orphan drug designation to
NeuroCell(TM)-PD for use in advanced Parkinson's patients and to
NeuroCell(TM)-HD for all Huntington's patients. Each received a designation for
use of the product both with and without antibody pretreatment to prevent
rejection.

NeuroCell(TM)-PD

Parkinson's disease is a neurodegenerative disease characterized by the
death of nerve cells in the brain that normally produce dopamine, the substance
that helps smooth and coordinate movement. The loss of these nerve cells results
in a variety of motor symptoms such as rigidity and slow movements, tremors,
falls and difficulties with speech and swallowing. In addition to decreased
quality of life, Parkinson's disease may result in premature death. The most
common therapy consists of administration of the drug levodopa (L-dopa), which
the brain converts to dopamine. Therapy with L-dopa is initially effective but
often loses its efficacy in six to 12 years and provides little benefit in the
late stages of the disease.

<PAGE> 35

In 1996, there were approximately 500,000 people afflicted with
Parkinson's disease in the U.S. These patients can be classified according to
the severity of their disease, with 115,000 to 155,000 being classified as
advanced stage patients whose disease has progressed to the point where the
patient requires significant assistance in daily living or is bedridden or
wheelchair bound. NeuroCell(TM)-PD is aimed at significantly improving the
clinical condition of these patients so that they can function independently.

Enrollment in a Phase I study of 12 patients at Lahey Hitchcock Clinic in
Burlington, Massachusetts and Boston University Medical Center was completed in
October 1996. Patients in this trial are being evaluated at periodic intervals
to assess long term clinical outcomes. The results at six months post-treatment
showed marked improvement in symptoms and restored efficacy of L-dopa in ten of
the 12 patients. An analysis of the ten evaluable patients also demonstrated
statistically significant improvement in mean scores on the Unified Parkinson's
Disease Rating Scale (UPDRS) six months post-treatment. Without treatment,
scores on UPDRS generally deteriorate over time as the disease progresses. These
results are similar to those obtained by other researchers treating Parkinson's
patients with human fetal cells. Commercialization of treatments using human
fetal cells is not practical, however, because of ethical concerns, supply
constraints and inconsistent quality.

A histological study published in the March 1997 issue of Nature Medicine
showed that NeuroCell(TM)-PD cells transplanted into one of the patients in the
Phase I trial survived for more than seven months and showed signs of
reconnecting nerve tissue damaged by the disease. The study marks the first
documentation of survival of cells transplanted from another species into the
human brain and of the appropriate growth of non-human neurons for a potential
therapeutic response. The patient, a 69-year old man, died of a pulmonary
embolism unrelated to treatment with Neurocell(TM)-PD. The brain of the patient
showed minimal signs of inflammation or rejection of the foreign tissue.

Based upon Phase I results, the joint venture is seeking approval from the
FDA to start a pivotal 32-patient Phase II/III trial of NeuroCell(TM)-PD in late
1997. If the protocol for the Phase II/III trial is approved by the FDA, 16
patients would receive Neurocell(TM)-PD, cyclosporin and corticosteroids and 16
would receive imitation surgery and placebo forms of the drugs. This trial would
be double blinded, randomized and conducted at four or more neurological
centers.

NeuroCell(TM)-HD

Huntington's disease is a fatal genetic disorder that is usually not
evident until middle age. The genetic defect causes the loss of specific neurons
in the brain which produce a substance important to the performance of rapid,
coordinated movements and certain aspects of cognition. The disease is generally
characterized by uncontrolled movements, gait and postural defects and dementia.
Like Parkinson's disease, it is a progressive disease often leading to
institutionalized care. Currently there is no effective therapy for Huntington's
disease. Treatment is palliative with tranquilizers and anti-psychotic drugs
being the only options. The NeuroCell(TM)-HD approach to treating this disease
consists of implanting fetal porcine cells into a patient's brain in an effort
to replace the function of the neurons damaged by Huntington's disease. In 1994,
there were approximately 25,000 patients suffering from Huntington's disease in
the U.S. and an additional 1,500 are estimated to become symptomatic each year.

NeuroCell(TM)-HD is in a 12-patient Phase I clinical trial at Lahey
Hitchcock Clinic, Boston University Medical Center, Brigham and Women's
Hospital in Boston and Rush Presbyterian in Chicago. All 12 patients were
treated as of the end of the first quarter of 1997. Patients in this trial are
being evaluated at periodic intervals to assess long-term clinical outcomes.
The results analyzed at three months post-treatment showed no observable
improvements in patient outcomes. GTR believes, however, that such improvements
may require a longer period to become evident.

Reimbursement

GTR believes that NeuroCell(TM)-PD and NeuroCell(TM)-HD, if approved,
would address patient populations insured under private plans as well as under
the Medicare/Medicaid system. At present, many private payers

<PAGE> 36

have been providing coverage for certain experimental surgical therapies for
Parkinson's disease on a case by case, cost-recovery basis. GTR believes that
for patients under 65, porcine neural implants may receive this type of
coverage. For those patients covered by Medicare, new payment codes and/or rates
may need to be established. While GTR expects to pursue a program to obtain
optimal reimbursement from all payers, there can be no guarantee that such
coverage will be obtained in the timeframe required.

Competition

While there are currently no effective long term therapies for advanced
Parkinson's disease and no effective treatments for Huntington's disease, GTR is
aware of other companies and institutions pursuing research and development of
alternative treatments for the diseases. Experimental therapies under
development for Parkinson's disease include surgical destruction of certain
portions of the brain (pallidotomy), gene therapy, the use of growth factors and
neuroprotectant therapy. There can be no assurance that research and development
by others will not render the NeuroCell(TM)-PD and NeuroCell(TM)-HD programs
obsolete or uneconomical or result in therapies superior to these programs, or
that these programs will be preferred to any newly developed technologies.

Epicel(SM) SERVICE

GTR's Epicel(SM) Service, which provides cultured autologous skin cells as
permanent skin replacement for patients with severe burns, was first introduced
in 1987. These epidermal grafts are grown from a patient's own (autologous) skin
cells and, therefore, are not rejected by the patient's immune system. Starting
with a patient biopsy about the size of a postage stamp, GTR can grow enough
skin grafts in three to four weeks to cover a patient's entire body surface
area. Each skin graft consists of a sheet of cultured skin cells, approximately
25 square centimeters in size and ranging from two to eight cell layers thick,
attached to a piece of surgical dressing material. A 48 hour shelf life allows
these grafts to be delivered anywhere in the U.S., Europe or Japan from GTR's
production laboratories in Cambridge, Massachusetts.

Most burn wounds involving less than 60% body surface area are covered
with conventional skin grafts within the three to four weeks it currently takes
to grow skin grafts produced using the Epicel(SM) Service. Therefore, GTR
believes that the primary candidates for the Epicel(SM) Service are the
approximately 400 patients each year in the U.S. who survive burn injuries
covering more than 60% of their body surface area. GTR also markets the
Epicel(SM) Service in parts of Europe through its own direct sales force and in
Japan through a distributor.

The Epicel(SM) Service has been on the market as an unregulated medical
device. As with Carticel(TM) ACC, GTR has operated the service under a
self-imposed set of rigorous quality standards for autologous cell culturing
services. Beginning December 1, 1997, GTR will be required to file an
application with the FDA under new regulations governing the therapeutic use of
manipulated autologous structural cells. As part of the public hearing process
for the development of these regulations, GTR presented information regarding
its autologous cell culturing procedures for both Carticel(TM) ACC and the
Epicel(SM) Service and, following receipt of the biologics license for
Carticel(TM) ACC, initiated discussions with the FDA regarding the Epicel(SM)
Service. GTR expects that the FDA will permit the service to remain on the
market until its regulatory status is resolved.

GTR received revenues from the Epicel(SM) Service of approximately
$4.2 million and $1.9 million for the year ended December 31, 1996 and the six
months ended June 30, 1997, respectively.

TRANSFORMING GROWTH FACTOR BETA 2 ("TGF-(BETA)(2)")

TGF-(beta)2 is one of a family of proteins that play an important role in
the body's ability to promote normal wound healing by stimulating the growth of
connective tissue. GTR has licensed recombinant TGF-(beta)(2) from Celtrix
Pharmaceuticals, Inc. ("Celtrix"). The product will consist of an easy-to-use
collagen sponge which serves as a bioresorbable delivery vehicle that releases
TGF-(beta)(2) at the wound site.

<PAGE> 37

Chronic skin ulcers are open, often painful wounds found predominantly on
the lower extremities of elderly patients. In the fourth quarter of 1995, GTR
began a 12 center, double-blinded, randomized Phase II clinical trial involving
200 diabetic patients suffering from foot ulcers. Study participants are being
assigned to one of three TGF-(beta)(2) impregnated collagen sponge dose groups,
a placebo group or a standard of care control group. The study is expected to
be completed by the end of 1998. GTR is currently seeking a corporate partner
to fund further development of this product.

GTR has also been developing recombinant TGF-(beta)(2) for formulation
as an intravenous injectable product for administration to multiple sclerosis
("MS") patients for the prevention of autoimmune damage to nerve tissue. A
Phase I study completed in 1995 in chronic progressive MS patients showed
reduced renal function in patients treated with TGF-(beta)(2). This result was
reversible after cessation of treatment. GTR believes that treatment protocols
can be developed that will not result in reduced renal function. GTR is seeking
a corporate partner to fund further development of the product for MS patients.

GTR's rights with respect to TGF-(beta)(2) derive from a license and
development agreement which Genzyme and Celtrix entered into in June 1994 (the
"Celtrix Agreement"). Genzyme's rights and obligations under the Celtrix
Agreement have been allocated to GTR. Pursuant to the Celtrix Agreement, GTR has
worldwide commercialization rights, excluding Asia, for all systemic indications
and select other indications of TGF-(beta)(2). GTR is obligated to make
milestone payments to Celtrix for product development related achievements and
to pay royalties based on cumulative product sales. Celtrix may reacquire
rights to indications not pursued by GTR.

VIANAIN(R) DEBRIDING PRODUCT

Vianain(R) Debriding Product is a proprietary enzyme preparation designed
to remove necrotic tissue from burn wounds and chronic skin ulcers. Phase II
clinical studies of Vianain(R) Debriding Product in burn patients and Phase I
clinical studies of the product for the treatment of chronic skin ulcers were
completed in 1995. Preliminary results from these studies indicated that
Vianain(R) Debriding Product was a safe and effective debriding agent, although
it did not yield an immediately graftable wound bed in burn patients. The FDA
has taken the position, however, that debriding agents must improve wound
healing in addition to removing tissue in order to obtain marketing approval.
GTR has been advised that the FDA is reviewing its position and may consider
approving agents that provide safe and effective debridement without additional
therapeutic benefit. GTR will evaluate further development of Vianain(R)
Debriding Product following resolution of the FDA's position on the approval
criteria for debriding agents.

PRODUCTION

GTR has developed and validated a commercial scale, propriety chondrocyte
processing system for Carticel(TM) ACC that was reviewed and approved by the FDA
in connection with the BLA. See "Business - Cartilage Repair - Carticel(TM) ACC
- - Change in Government Regulation."

GTR produces materials for Carticel(TM) ACC in specialized facilities
located in Cambridge and Framingham, Massachusetts designed for production of
cell based therapies and which have been approved by the FDA. Under current
production methods, these facilities have the combined capacity to process over
13,000 cartilage biopsies per year. GTR has also designed process improvements
directed towards expanding autologous chondrocyte culture capacity, streamlining
processing, improving quality and lowering production costs while strengthening
GTR's proprietary position. This work includes improving yields, reducing labor
costs associated with harvesting chondrocytes from cartilage biopsies,
developing methods for extending the viability of both biopsy specimens and
final product cell suspensions and balancing the space required for growing
cells with requirements for feeding and inspecting. GTR also produces materials
for the Epicel(SM) Service at its Cambridge facility.

<PAGE> 38

PATENTS AND PROPRIETARY RIGHTS

Genzyme pursues a policy of obtaining patent protection both in the U.S.
and in selected foreign countries for subject matter considered patentable and
important to its business. In addition, a portion of Genzyme's proprietary
position is based upon patents licensed to Genzyme. These license agreements
generally require Genzyme to pay royalties upon commercialization of products
covered by the licensed technology. Genzyme's patent position and proprietary
technology are subject to certain risks and uncertainties. See "Risk Factors -
Risks Related to GTR - Uncertainty Regarding Patents and Proprietary Position."

Genzyme received its first patent in the tissue repair field in October
1995 for its method of freezing cells. In addition, Genzyme has filed and is
preparing several patent applications covering GTR's work in cartilage repair.
GTR possesses substantial know-how in the field of autologous cell processing
generally, and for Carticel(TM) ACC in particular. Such know-how includes the
production of biopsy kits and packaging materials, procedures for quality
control, sterility, segregation and manufacturing, product delivery and the
method by which GTR validates assays for future development. GTR believes that
this significant technological know-how places it in a competitively
advantageous position.

Diacrin/Genzyme LLC has an exclusive license in the field of Parkinson's
and Huntington's diseases to a patent involving technology being developed at
Massachusetts General Hospital for treatment of cells to prevent rejection of
NeuroCell(TM)-PD and NeuroCell(TM)-HD without the need for immunosuppressive
drugs. Diacrin also has patents pending in the U.S. and other countries
relating to fetal porcine cells. Diacrin/Genzyme LLC will obtain exclusive
worldwide licenses to such patents in the field of Parkinson's and Huntington's
diseases as they are issued.

Genzyme's proprietary position in the culturing of epidermal tissues was
originally exclusively licensed from Harvard University and has been augmented
with additional patents obtained by Genzyme covering cool storage technology and
packaging of skin grafts produced using the Epicel(SM) Service. Genzyme is also
the exclusive licensee, on a worldwide basis except for Italy, of patents
covering cryopreservation of such skin grafts. Genzyme has extended this basic
cryopreservation technology by patenting additional developments and
improvements in the U.S.

Celtrix has obtained patents and filed patent applications in the U.S. and
foreign countries on the composition of TGF-(beta)(2) and its formulation.
Genzyme has an exclusive worldwide license (excluding Asia) from Celtrix for
therapeutic applications in wound healing, cancer, immune therapy and bone
therapy.

While Genzyme seeks a strong patent position, it believes that its
competitive position will also depend on its ability to maintain its trade
secrets and proprietary know-how, to achieve market leadership in key product
areas and to obtain successful clinical results. Genzyme's employees, advisors
and consultants who have access to GTR proprietary information are required to
sign confidentiality agreements.

GOVERNMENT REGULATION

Material developments relating to the regulation of Carticel(TM) ACC, the
NeuroCell(TM) products and the Epicel(SM) Service are described above under
"Business - Cartilage Repair - Carticel(TM) ACC - Government Regulation," "-
Neurodegenerative Diseases - Diacrin/Genzyme LLC" and "- Epicel(SM) Service."

A federal criminal statute that prohibits the transfer of any human organ
for valuable consideration for use in human transplantation, but which permits
recovery of reasonable costs associated with such activities, has not been
applied to Carticel(TM) ACC or the Epicel(SM) Service. Certain states have laws
requiring the licensure of tissue and organ banks and laws governing the sale of
human organs and the safety and efficacy of drugs, devices and biologics,
including skin, all of which could be interpreted to apply to GTR's production
and distribution of cultured tissue products. Provisions in certain states'
statutes prohibit the receipt of valuable consideration in connection with the
sale of human tissue by a tissue bank but permit licensed tissue banks,
including companies, to recover their reasonable costs associated with such
sales. The application of these or

<PAGE> 39

other regulations to GTR could result in significant expense to GTR, limit GTR's
reimbursement for its services and otherwise materially adversely affect GTR's
results of operations.

GTR is also subject to various federal, state and local laws, regulations
and recommendations relating to safe working conditions, laboratory and
manufacturing practices and the use and disposal of hazardous or potentially
hazardous substances used in connection with GTR's research work and
manufacturing operations. Although GTR believes that its safety procedures
comply with the standards prescribed by federal, state and local regulations,
the risk of contamination, injury or other accidental harm cannot be completely
eliminated. In the event of such an accident, GTR could be held liable for any
damages that result and any liabilities could exceed GTR's resources.

RELATIONSHIP WITH OTHER DIVISIONS OF GENZYME

The relationship between GTR and Genzyme General is governed by a series
of policies adopted by the Genzyme Board. For a complete description of these
policies, see "Management and Accounting Policies Governing the Relationship of
Genzyme Divisions."

As a division of Genzyme, GTR has access to the resources and expertise of
Genzyme, including those allocated to Genzyme General. This relationship has
allowed GTR to accelerate commercialization of Carticel(TM) ACC. GTR believes
that access to Genzyme General's research and development capabilities and
corporate development expertise will allow GTR to more rapidly develop its
existing products and services and take advantage of new opportunities in the
field of tissue repair.

Pursuant to an arrangement made at the time of formation of GTR, Genzyme
has an option to allocate up to $10 million in cash from Genzyme General to GTR
on or before June 14, 1998 in exchange for 1,000,000 GTR Designated Shares. In
addition, the Genzyme Board has also approved the GTR Equity Line, which
provides for the allocation of up to $20 million in cash from Genzyme General to
GTR. Any amounts allocated to GTR under the GTR Equity Line will result in an
increase in the number of GTR Designated Shares. The increase will be determined
by dividing (i) the amount of cash so allocated by (ii) the average of the daily
closing prices of GTR Stock for the 20 consecutive trading days commencing on
the 30th trading day prior to the date of such allocation. Of the $20 million
authorized for allocation to GTR, approximately $6.0 million had been allocated
as of June 30, 1997.

<PAGE> 40

MANAGEMENT

SENIOR MANAGEMENT OF GTR

The senior management of GTR consists of the following individuals:

<TABLE>
<CAPTION>
NAME AGE TITLE
- ---- --- -----
<S> <C> <C>
Timothy R. Surgenor 37 President
Russell N. Herndon 39 Senior Vice President
John M. McPherson, Ph.D. 49 Senior Vice President, Research and Development
Jean George 39 Vice President, Sales and Marketing
</TABLE>

MR. SURGENOR joined Genzyme as Executive Vice President of GTR in December
1994 when Genzyme acquired BioSurface and became President of GTR in September
1996. Mr. Surgenor joined BioSurface in May 1987 and served as Executive Vice
President from November 1992 until December 1994. He served as Vice President,
Finance, and Treasurer of BioSurface from 1990 to 1993.

MR. HERNDON joined Genzyme in September 1989 as Quality Assurance Manager,
became Manager of Regulatory Affairs in September 1990, Director of Regulatory
Affairs in September 1991, and was named Vice President of Regulatory Affairs in
October 1994. Since April 1997, he has served as Senior Vice President of GTR
with responsibility for GTR's operations, program management and regulatory
affairs.

DR. MCPHERSON joined Genzyme in August 1989 and has served as Vice
President, Therapeutic Protein Development from November 1989 to May 1993, as
Vice President, Biotherapeutic Product Development from May 1993 to September
1996 and as Senior Vice President, Protein Development since then. He was
appointed Vice President, Research and Development of GTR in December 1994.
Prior to joining Genzyme, he was, since April 1988, Director, Protein Chemistry
of Integrated Genetics, Inc.

MS. GEORGE joined Genzyme in February 1988 as Business Development Manager
and became Director, Biotherapeutic Products in 1991. She served on the project
team that managed the acquisition of BioSurface and the formation of GTR. Ms.
George was named Vice President, Marketing in December 1994 and since June 1997
has served as Vice President, Sales and Marketing of GTR.

MANAGEMENT OF GENZYME

The current executive officers and directors of Genzyme are as follows:

<TABLE>
<CAPTION>
NAME AGE TITLE
- ---- --- -----
<S> <C> <C>
Henri A. Termeer 51 Chairman of the Board, President
and Chief Executive Officer
Earl M. Collier, Jr. 50 Executive Vice President
Geoffrey F. Cox, Ph.D. 53 Executive Vice President
David J. McLachlan 59 Executive Vice President, Finance
and Chief Financial Officer
G. Jan van Heek 48 Executive Vice President
Peter Wirth 47 Executive Vice President and Chief Legal Officer
David D. Fleming 49 Group Senior Vice President, Diagnostics
John V. Heffernan 58 Senior Vice President, Human Resources
Richard A. Moscicki, M.D. 45 Senior Vice President, Clinical, Medical and
Regulatory Affairs and Chief Medical Officer
Alan E. Smith, Ph.D. 51 Senior Vice President, Research and Chief
Scientific Officer
Constantine E. Anagnostopoulos, Ph.D. 74 Director

</TABLE>

38
<PAGE> 41
<TABLE>
<CAPTION>
<S> <C> <C>
Douglas A. Berthiaume 48 Director
Henry E. Blair 54 Director
Robert J. Carpenter 52 Director
Charles L. Cooney 52 Director
Henry R. Lewis 71 Director
</TABLE>

Each officer's term of office extends until the meeting of the Genzyme
Board following the next annual meeting of stockholders and until a successor is
elected and qualified or until his or her earlier resignation or removal.

MR. TERMEER has served as President of Genzyme since October 1983, Chief
Executive Officer since December 1985 and Chairman of the Board since May 1988.
For ten years prior to joining Genzyme, Mr. Termeer worked for Baxter Travenol
Laboratories, Inc., a manufacturer of human health care products. Mr. Termeer is
Chairman of the Board of Genzyme Transgenics Corporation ("GTC") and, until its
acquisition by Genzyme in December 1996, was Chairman of the Board of Neozyme II
Corporation ("Neozyme II"). Mr. Termeer is also a director of Abiomed, Inc.,
AutoImmune Inc., Diacrin, Inc. and GelTex Pharmaceuticals, Inc., and a trustee
of Hambrecht & Quist Healthcare Investors and of Hambrecht & Quist Life Sciences
Investors.

MR. COLLIER joined Genzyme in July 1996 as Senior Vice President, Health
Systems and has served as Executive Vice President since July 1997. Mr. Collier
is responsible for Genzyme's surgical products business. Prior to joining
Genzyme, Mr. Collier was President of Vitas HealthCare Corporation (formerly
Hospice Care Incorporated), a provider of health care services, from October
1991 until August 1995. Prior to that, Mr. Collier was a partner in the
Washington, D.C. law firm of Hogan & Hartson, which he joined in 1981.

DR. COX joined Genzyme in June 1984 and has served as Executive Vice
President since September 1996. From May 1988 until September 1996, he served as
Senior Vice President, Operations of Genzyme. Dr. Cox also is responsible for
Genzyme's diagnostic and pharmaceuticals businesses and global manufacturing
operations. For 14 years prior to joining Genzyme, Dr. Cox worked for the
manufacturing division of British Fermentation Products, Ltd., a division of
Gist-Brocades N.V. Dr. Cox is also a director of Aronex Pharmaceuticals, Inc.

MR. MCLACHLAN joined Genzyme in December 1989 and has served as Executive
Vice President, Finance since September 1996. Mr. McLachlan served as Senior
Vice President, Finance from 1989 to September 1996 and has held the position of
Chief Financial Officer since 1989. Prior to joining Genzyme, he served for more
than five years as Vice President of Finance for Adams-Russell Electronics Inc.,
a defense electronics manufacturer, and Adams-Russell Co., Inc., a cable
television company. Mr. McLachlan also serves as a director of HearX, Ltd., a
company providing products and services to the hearing impaired.

MR. VAN HEEK joined Genzyme in September 1991 as General Manager of its
wholly-owned subsidiary, Genzyme, B.V., and became a Genzyme Vice President and
the President of Genzyme's therapeutics business unit in December 1993. From
September 1996 through July 1997, Mr. van Heek served as Group Senior Vice
President, Therapeutics and since July 1997 has served as Executive Vice
President with responsibility for Genzyme's specialty therapeutics and tissue
repair businesses and international operations. Prior to joining Genzyme, he
was, since 1988, Vice President/General Manager of the Fenwal Division of

<PAGE> 42

Baxter Healthcare Corporation. Mr. van Heek also served as President and
Treasurer of Neozyme II from March 1992 to January 1996.

MR. WIRTH joined Genzyme in January 1996 and has served as Executive Vice
President and Chief Legal Officer since September 1996. Mr. Wirth also oversees
Genzyme's corporate development activities. From January 1996 to September 1996,
Mr. Wirth served as Senior Vice President and General Counsel of Genzyme. Mr.
Wirth was also a partner of Palmer & Dodge LLP, a Boston, Massachusetts law
firm, from 1982 through September 1996. Mr. Wirth remains of counsel to Palmer &
Dodge LLP and is a director of Transkaryotic Therapies, Inc., a gene therapy
company.

MR. FLEMING joined Genzyme in April 1984 and has served as Group Senior
Vice President, Diagnostics since September 1996. Prior to that date he served
as President of Genzyme's diagnostics business unit beginning in January 1989
and as a Senior Vice President of Genzyme beginning in August 1989. For 11 years
prior to joining Genzyme, he worked for Baxter Travenol Laboratories, Inc.

MR. HEFFERNAN joined Genzyme as Vice President, Human Resources in October
1989 and has served as Senior Vice President, Human Resources since May 1992.
Prior to joining Genzyme, he served for more than five years as Vice President,
Human Resources Corporate Staff of GTE Corporation, a diversified communications
and electronics company.

DR. MOSCICKI joined Genzyme in March 1992 as Medical Director, became Vice
President, Medical Affairs in early 1993 and was named Vice President, Clinical,
Medical and Regulatory Affairs in December 1993. Since September 1996, he has
served as Senior Vice President, Clinical Medical and Regulatory Affairs and
Chief Medical Officer. Since 1979, he has also been a physician staff member at
the Massachusetts General Hospital and a faculty member at the Harvard Medical
School.

DR. SMITH joined Genzyme in August 1989 as Senior Vice President, Research
and has also served as Chief Scientific Officer since September 1996. Prior to
joining Genzyme, he served as Vice President-Scientific Director of Integrated
Genetics, Inc. from November 1984 until its merger with Genzyme in August 1989.
From October 1980 to October 1984, Dr. Smith was head of the Biochemistry
Division of the National Institute for Medical Research, Mill Hill, London,
England and from 1972 to October 1980, he was a member of the scientific staff
at the Imperial Cancer Research Fund in London. Dr. Smith also serves as a
director of GTC.

DR. ANAGNOSTOPOULOS is Managing General Partner of Gateway Associates,
which is the general partner of Gateway Venture Partners III, L.P., a venture
capital partnership. From January 1986 to April 1987, Dr. Anagnostopoulos was a
consultant to Monsanto Company, a producer of pharmaceuticals, chemicals,
plastics and textiles, and to Alafi Capital, a venture capital firm. From 1982
through 1985, he served as Corporate Vice President of Monsanto Company.

MR. BERTHIAUME is Chairman, President and Chief Executive Officer of
Waters Corporation, a high technology manufacturer of products used for analysis
and purification, formerly a division of Millipore Corporation. From November
1990 to August 1994, he was President of the Waters Division of Millipore
Corporation.

MR. BLAIR is the Chief Executive Officer of Dyax Corp., a privately-held
bioseparation, pharmaceutical discovery and development company, and a
consultant to several companies, including Genzyme. Prior to January 1990, Mr.
Blair was Senior Vice President, Scientific Affairs of Genzyme. Before joining
Genzyme in 1981, he was Associate Director of the New England Enzyme Center at
Tufts University School of Medicine. Mr. Blair is also a director of GTC and
Celtrix Pharmaceuticals, Inc.

MR. CARPENTER is President and Chief Executive Officer of VacTex, Inc., a
privately held biotechnology company which he co-founded in November 1995, and
Chairman of GelTex Pharmaceuticals, Inc., a publicly held pharmaceutical
development company which he co-founded in November 1991 and where he served as
President and Chief Executive Officer until May 1993. Mr. Carpenter was Chairman
of the

<PAGE> 43

Board, President and Chief Executive Officer of Integrated Genetics, Inc., a
biotechnology company that merged with Genzyme in 1989. Following the merger and
until 1991, Mr. Carpenter was Executive Vice President of Genzyme, and Chief
Executive Officer and Chairman of the Board of IG Laboratories, Inc. Mr.
Carpenter is also a director of Apex BioSciences, Inc. and, prior to its
acquisition by Genzyme in December 1996, was a director of Neozyme II.

DR. COONEY is a Professor of Chemical and Biochemical Engineering and
Co-Director of the Program on the Pharmaceutical Industry at Massachusetts
Institute of Technology ("MIT"). Dr. Cooney joined the MIT faculty as an
Assistant Professor in 1970 and became a Professor in 1982. Dr. Cooney is also a
principal of BioInformation Associates, Inc., a consulting company.

MR. LEWIS is a consultant to several companies and a member of the Board
of Directors of Delphax Systems, a manufacturer of high speed non-impact
printers. From 1986 to February 1991, Mr. Lewis was the Vice Chairman of the
Board of Dennison Manufacturing Company, a manufacturer and distributor of
products for the stationery, technical paper and industrial and retail systems
markets. From 1982 to 1986, Mr. Lewis was a Senior Vice President of Dennison
Manufacturing Company.

<PAGE> 44

DESCRIPTION OF GENZYME CAPITAL STOCK

The following descriptions are qualified in their entirety by reference to
the Restated Articles of Organization of Genzyme.

INTRODUCTION

Genzyme is authorized to issue 390 million shares of common stock, of
which 40 million shares have been designated GTR Stock, 200 million shares have
been designated GGD Stock, 40 million shares have been designated GMO Stock and
110 million shares remain undesignated as to series. In addition, Genzyme is
authorized to issue 10 million shares of preferred stock. Each designated series
of Genzyme common stock has the voting powers, qualifications and rights
described below.

DIVIDENDS

Genzyme has never paid any cash dividends on shares of its capital stock.
Genzyme currently intends to retain its earnings to finance future growth and,
therefore, does not anticipate paying any cash dividends on Genzyme common stock
in the foreseeable future.

Dividends on each series of Genzyme common stock may be declared and paid
only out of the lesser of funds of Genzyme legally available therefor and the
Available GTR Dividend Amount (with respect to the GTR Stock), the Available GGD
Dividend Amount (with respect to the GGD Stock) or the Available GMO Dividend
Amount (with respect to the GMO Stock). Under the Massachusetts Business
Corporation Law (the "MBCL"), the payment of dividends is permitted if the
corporation is not insolvent, the dividend payment does not render the
corporation insolvent, and the dividend payment does not violate the
corporation's articles of organization. Subject to such limitations, the Genzyme
Board may, in its sole discretion, declare and pay dividends exclusively on any
series of Genzyme common stock, in equal or unequal amounts, notwithstanding the
amounts available for the payment of dividends on each series, the respective
voting and liquidation rights of each series, the amounts of prior dividends
declared on each series or any other factor.

As stated above, in addition to the statutory limitations under the MBCL,
dividends on the GTR Stock, GGD Stock and the GMO Stock are limited to an amount
not in excess of the Available GTR Dividend Amount, the Available GGD Dividend
Amount or the Available GMO Dividend Amount, respectively. The "Available
Dividend Amount" with respect to a particular series of Genzyme common stock is
defined to mean generally the greater of

(i) the excess of

(a) the greater of

(X) the fair value of the net assets allocated to the
division represented by such series of Genzyme common stock and

(Y) an amount equal to stockholders' equity allocated
to such division as of June 30, 1994, in the case of the GGD Stock and the GTR
Stock, and September 30, 1996, in the case of the GMO Stock, increased or
decreased, as appropriate, to reflect, after such date

(1) the net income or loss of such division,

(2) any dividends or other distributions
(including by reclassification or exchange) declared or paid with respect to, or
repurchases or issuances of, any shares of capital stock attributed to such
division, but excluding dividends or other distributions paid in shares of
capital stock attributed to such division to the holders thereof and

<PAGE> 45

(3) any other adjustments to the
stockholders' equity of such division made in accordance with generally
accepted accounting principles, over

(b) the aggregate par value of all outstanding shares of
capital stock attributed to such division and

(ii) the amount legally available for the payment of dividends
determined in accordance with Massachusetts law applied as if such division were
a separate corporation.

EXCHANGE OF GTR STOCK AND GMO STOCK

The GTR Stock or the GMO Stock may be exchanged for any combination of
cash and/or GGD Stock upon the terms described below. Genzyme cannot predict the
impact on the market prices for each class of Genzyme common stock of its
ability to effect such exchanges.

OPTIONAL EXCHANGE. The Genzyme Board may at any time exchange all outstanding
shares of GTR Stock or GMO Stock for any combination of cash and/or GGD Stock
having a Fair Market Value equal to 130% of the Fair Market Value of the GTR
Stock or GMO Stock, as the case may be, such Fair Market Value being determined
by the trading prices during a specified period prior to the first public
announcement by Genzyme of such exchange.

The foregoing provision allows Genzyme the flexibility to redeem all
outstanding shares of GTR Stock and/or GMO Stock and leave outstanding one or
two series of Genzyme common stock that would, collectively, represent the
residual equity interest in all of Genzyme's businesses. The optional exchange
could be exercised at any future time if the Genzyme Board determined that,
under the facts and circumstances then existing, an equity structure consisting
of three series of common stock was no longer in the best interests of all of
Genzyme's stockholders. Such exchange may be completed, however, at a time that
is disadvantageous to the holders of a particular series of Genzyme common
stock. The right of the Genzyme Board to exchange at any time all outstanding
shares of GTR Stock or GMO Stock for any combination of cash and/or GGD Stock
having a Fair Market Value equal to 130% of the Fair Market Value of the GTR
Stock or the GMO Stock does not preclude the Genzyme Board from making an offer
to exchange such shares on terms other than those provided in the Genzyme
Charter. Although any alternative offer would be subject to acceptance by
holders of the shares to be exchanged, such offer could be made on terms less
favorable than those provided in the Genzyme Charter. See "Risk Factors - Risks
Related to Genzyme Tracking Stock - No Rights or Additional Duties With Respect
to the Divisions; Potential Conflicts."

MANDATORY EXCHANGE. In the event of the disposition, in one transaction or a
series of related transactions, by Genzyme of all or substantially all of the
properties and assets allocated to GTR or GMO (other than in connection with the
sale by Genzyme of all or substantially all of its properties and assets) to any
person, entity or group (other than (i) a wholly-owned subsidiary of Genzyme or
(ii) any entity formed at the direction of Genzyme in connection with obtaining
financing for the programs or products of GTR or GMO, as the case may be),
Genzyme will be required to exchange each outstanding share of GTR Stock or GMO
Stock for any combination of cash and/or GGD Stock having a Fair Market Value
equal to 130% of the Fair Market Value of GTR Stock or GMO Stock, as the case
may be, as determined by the trading prices during a specified period prior to
the first public announcement by Genzyme of such disposition. See "Risk Factors
- - Risks Related to Genzyme Tracking Stock Exchange of GTR Stock and GMO Stock."

VOTING RIGHTS

Holders of shares of each series of Genzyme common stock vote together as
a single class on all matters as to which common stockholders generally are
entitled to vote (including the election of directors). On all such matters,
each share of GGD Stock has one vote, each share of GTR Stock has, through
December 31, 1998, .33 vote, and each share of GMO Stock has, through December
31, 1998, .25 vote. Holders of outstanding GGD Stock, GTR Stock and GMO Stock
currently have approximately 92.6%, 6.2% and 1.2%,

<PAGE> 46

respectively, of the total voting power of Genzyme. Following completion of this
offering and assuming that the Underwriters' over-allotment option is not
exercised, holders of GGD Stock, GTR Stock and GMO Stock will have approximately
___%, ____% and ___%, respectively, of the total voting power of Genzyme. On
January 1, 1999 and on each January 1 every two years thereafter, the number of
votes to which each share of GTR Stock and GMO Stock is entitled will be
adjusted to equal the ratio of the Fair Market Value of one share of GTR Stock
or GMO Stock, as the case may be, to the Fair Market Value of one share of GGD
Stock as of such date. If no shares of GGD Stock are outstanding on such date,
then all other series of Genzyme common stock outstanding on such date will have
a number of votes such that each share of the series of common stock that has
the highest Fair Market Value per share on such date (the "Base Series") will
have one vote, and each share of each other series of outstanding common stock
will have the number of votes determined according to the immediately preceding
sentence, treating, for such purpose, the Base Series as the GGD Stock in such
sentence.

The voting rights of the GTR Stock and the GMO Stock will be appropriately
adjusted so as to avoid dilution in the aggregate voting rights of any series of
Genzyme common stock in the event the outstanding shares of any series are
subdivided (by stock split, reclassification or otherwise) or combined (by
reverse stock split, reclassification or otherwise), or in the event of the
issuance of shares of any series as a dividend or a distribution to holders of
shares of such series. If shares of only one series of Genzyme common stock are
outstanding, or if shares of any series of Genzyme common stock are entitled to
vote separately as a class, each share of that series would have one vote.

The relative voting rights of each series of Genzyme common stock are
adjusted from time to time as described above so that a holder's voting rights
may more closely reflect the market value of such holder's equity investment in
Genzyme. Adjustments in the relative voting rights of each class of Genzyme
common stock may influence an investor interested in acquiring and maintaining a
fixed percentage of Genzyme's voting power to acquire such percentage of all
series of Genzyme common stock, and will limit the ability of investors in one
series to acquire for the same consideration relatively greater or lesser voting
power per share than investors in the other series. To the extent the relative
market values of each series of Genzyme common stock change prior to the first
such adjustment or in between any adjustments, however, an investor in one
series of Genzyme common stock may acquire relatively more or less voting power
for the same consideration when compared with investors in another series of
Genzyme common stock.

In addition to voting together as a single class of stock, the Genzyme
Charter requires the approval by the holders of the affected series of Genzyme
common stock at a meeting at which a quorum is present and the votes cast in
favor of the proposal exceed those cast against to:

(i) allow any proceeds from the disposition of the properties or
assets allocated to any division to be used in the business of the other
division without fair compensation,

(ii) allow any properties or assets allocated to any division to
be used in the business of another division or for the declaration or payment of
any dividend or distribution on any series of Genzyme common stock not
attributed to such division without fair compensation,

(iii) issue shares of any series of Genzyme common stock without
allocating the proceeds of such issuance to the division represented by such
series of Genzyme common stock (provided, however, that Genzyme may without such
approval issue GTR Designated Shares and GMO Designated Shares),

(iv) change the rights or preferences of any series of Genzyme
common stock so as to affect the series adversely or

(v) effect any merger or business combination involving Genzyme
as a result of which (a) the holders of all series of Genzyme common stock shall
no longer own, directly or indirectly, at least fifty percent (50%) of the
voting power of the surviving corporation and (b) the holders of all series of
Genzyme common stock do not receive the same form of consideration, distributed
among such holders in proportion to

<PAGE> 47

the market capitalization of each series of Genzyme common stock as of the date
of the first public announcement of such merger or business combination.

In addition to the voting rights provided in the Genzyme Charter, the
approval of the holders of a majority of the outstanding shares of each series
of Genzyme common stock, voting together as a single class, is required under
the current MBCL to approve any amendment to the articles of organization that
would alter or change the powers, preferences or special rights of the shares of
such series so as to affect them adversely. The MBCL does not currently provide
for any other separate voting rights for a series of common stock. Consequently,
because most matters brought to a stockholder vote will only require the
approval of a majority of all of Genzyme's outstanding capital stock entitled to
vote on such matters (including all series of common stock) voting together as a
single class and because the holders of GGD Stock will initially have more than
the number of votes required to approve any such matter, such holders would be
in a position to control the outcome of the vote on such a matter. See "Risk
Factors - Risks Related to Genzyme Tracking Stock - No Additional Separate
Voting Rights."

LIQUIDATION RIGHTS

In the event of a voluntary or involuntary dissolution, liquidation or
winding up of the affairs of Genzyme, after Genzyme has satisfied or made
provision for its debts and obligations and for payment to the holders of shares
of any series of capital stock having preferential rights to receive
distributions of the net assets of Genzyme, the holders of Genzyme common stock
are entitled to receive the net assets, if any, remaining for distribution to
common stockholders on a per share basis in proportion to the respective per
share liquidation units of such series and will have no direct claim against any
particular assets of Genzyme or any of its subsidiaries. Each share of GGD Stock
has 100 liquidation units, each share of GTR Stock has 58 liquidation units and
each share of GMO Stock has 25 liquidation units. The liquidation units of the
GTR Stock and the GMO Stock will be appropriately adjusted so as to avoid
dilution in the aggregate liquidation rights of any series in the event the
outstanding shares of any series are subdivided (by stock split,
reclassification or otherwise) or combined (by reverse stock split,
reclassification or otherwise), or in the event of the issuance of shares of any
series as a dividend or a distribution to holders of shares of that series, but
will not otherwise be adjusted. A merger or business combination involving
Genzyme or a sale of all or substantially all of the assets of Genzyme will not
be treated as a liquidation. Genzyme may not, however, without approval by the
holders of the GTR Stock and the GMO Stock voting as separate series of stock,
effect any merger or business combination involving Genzyme as a result of which
(i) the holders of all series of Genzyme common stock shall no longer own,
directly or indirectly, at least fifty percent of the voting power of the
surviving corporation and (ii) the holders of each series of Genzyme common
stock do not receive the same form of consideration, distributed among such
holders in proportion to the market capitalization of each series of common
stock as of the date of the first public announcement of such merger or business
combination.

GTR DESIGNATED SHARES AND GMO DESIGNATED SHARES

GTR Designated Shares and GMO Designated Shares are authorized shares of
GTR Stock and GMO Stock, respectively, which are not issued and outstanding, but
which the Genzyme Board may from time to time issue, sell or otherwise
distribute without allocating the proceeds or other benefits of such issuance,
sale or distribution to GTR or GMO, respectively. The shares of GTR Stock and
GMO Stock that are issuable with respect to the GTR Designated Shares and the
GMO Designated Shares, respectively, are not outstanding shares of GTR Stock or
GMO Stock, are not eligible to receive dividends and cannot be voted by Genzyme.

As of July 31, 1997, there were 893,847 GTR Designated Shares,
representing a potential 5.7% equity interest in GTR. The number of GTR
Designated Shares from time to time will be:

(i) adjusted as appropriate to reflect subdivisions (by stock
split or otherwise) and combinations (by reverse stock split or otherwise) of
the GTR Stock and dividends or distributions of shares of GTR Stock to holders
of GTR Stock and other reclassifications of GTR Stock;

<PAGE> 48

(ii) decreased by (a) the number of any shares of GTR Stock issued
by Genzyme, the proceeds of which are allocated to Genzyme General, (b) the
number of any shares of GTR Stock issued upon the exercise or conversion of
securities convertible into GTR Stock that are attributed to Genzyme General and
(c) the number of any shares of GTR Stock issued by Genzyme as a dividend or
distribution or by reclassification, exchange or otherwise to holders of GGD
Stock; and

(iii) increased by (a) the number of any outstanding shares of GTR
Stock repurchased by Genzyme, the consideration for which was allocated to
Genzyme General, (b) one for each $10.00 reallocated from Genzyme General to GTR
from time to time in satisfaction of the purchase option of Genzyme General set
forth in section 4.18 of the Agreement and Plan of Reorganization among Genzyme,
Phoenix Acquisition Corporation and BioSurface Technology, Inc. dated as of
July 25, 1994, up to a maximum $30 million, and (c) the number of shares of GTR
Stock equal to the fair value (as determined by the Genzyme Board) of assets or
properties allocated to Genzyme General that are reallocated to GTR (other than
reallocations that represent sales at fair value between such divisions or
reallocations described in clause (b) above) divided by the Fair Market Value of
one share of GTR Stock as of the date of such reallocation.

The Genzyme Charter prohibits the taking of any action which would have the
effect of reducing the number of GTR Designated Shares to a number which is less
than zero.

As of July 31, 1997, there were 6,000,000 GMO Designated Shares,
representing a potential 60.4% equity interest in GMO. The number of GMO
Designated Shares from time to time will be:

(i) adjusted as appropriate to reflect subdivisions (by stock
split or otherwise) and combinations (by reverse stock split or otherwise) of
the GMO Stock and dividends or distributions of shares of GMO Stock to holders
of GMO Stock and other reclassifications of GMO Stock;

(ii) decreased by (a) the number of any shares of GMO Stock issued
by Genzyme, the proceeds of which are allocated to Genzyme General, (b) the
number of any shares of GMO Stock issued upon the exercise or conversion of
securities convertible into GMO Stock that are attributed to Genzyme General and
(c) the number of any shares of GMO Stock issued by Genzyme as a dividend or
distribution or by reclassification, exchange or otherwise to holders of GGD
Stock; and

(iii) increased by

(a) the number of any outstanding shares of GMO Stock
repurchased by Genzyme, the consideration for which was allocated to Genzyme
General;

(b) the number of shares of GMO Stock equal to the fair
value (as determined by the Genzyme Board) of assets or properties allocated to
Genzyme General that are reallocated to GMO (other than reallocations that
represent sales at fair value between such divisions) divided by the Fair Market
Value of one share of GMO Stock as of the date of such reallocation;

(c) with respect to amounts drawn under an equity line of
credit approved by the Genzyme Board providing for the allocation of up to $25
million in cash from Genzyme General to GMO (the "GMO Equity Line"), a number
equal to the sum of the quotients obtained by dividing (A) the amount of each
advance under the Equity Line by (B) $7.00 plus or minus a daily proration
of the difference between the price to the public in this offering and $7.00,
assuming straight line appreciation or depreciation in the value of the GMO
Stock over the period from the closing date of the acquisition of PharmaGenics,
Inc. to the closing date of this offering; and, thereafter, upon each advance
made under the Equity Line, a number equal to the quotient obtained by dividing
(X) the amount of each such advance by (Y) the Fair Market Value of the GMO
Stock on the date of such advance; or

(d) the number of shares of GMO Stock into which the
Genzyme Board elects to convert the promissory note dated February 10, 1997
issued by PharmaGenics, Inc. to Genzyme.

<PAGE> 49

The Genzyme Charter prohibits the taking of any action which would have the
effect of reducing the number of GMO Designated Shares to a number which is less
than zero.

Whenever additional shares of any series of common stock are issued and
sold by Genzyme, Genzyme will identify (i) the number of such shares issued and
sold for the account of the division to which they relate, the proceeds of which
will be allocated to and reflected in the financial statements of such division
and (ii) the number of such shares issued and sold from the GTR Designated
Shares or the GMO Designated Shares, which shall reduce the number of GTR
Designated Shares or GMO Designated Shares, as the case may be, and the proceeds
of which may be used for any proper corporate purpose. In the event Genzyme
repurchases outstanding shares of GTR Stock or GMO Stock, it will identify the
number of shares that are repurchased for consideration that was allocated to
Genzyme General and the number of GTR Designated Shares or GMO Designated Shares
may increase accordingly.

"ANTI-TAKEOVER" PROVISIONS

CONTRACTUAL MEASURES. The Genzyme Charter and the By-Laws of Genzyme (the
"By-Laws") contain provisions that could discourage potential takeover attempts
and prevent stockholders from changing Genzyme's management, including
authorization of the Genzyme Board to issue shares of common stock and preferred
stock in series, enlarge the size of the Genzyme Board and fill any vacancies on
the Genzyme Board, and restrictions on the ability of stockholders to call a
special meeting of stockholders, bring business before an annual meeting and
nominate candidates for election as directors. Genzyme also has agreements with
certain officers containing change of control provisions.

In addition, Genzyme has a stockholder rights plan. Under this plan, each
outstanding share of GTR Stock, GGD Stock and GMO Stock also represents a right
that, under certain circumstances, may trade separately from the GTR Stock, GGD
Stock and GMO Stock, respectively. The rights, which are not currently
exercisable, under certain circumstances will permit their holders (other than
an acquiror) to purchase at a favorable price large amounts of GTR Stock, GGD
Stock and GMO Stock or securities of a successor to Genzyme with the result that
an acquiror's interest in Genzyme would be substantially diluted. The
description and terms of the rights are set forth in an Amended and Restated
Rights Agreement between Genzyme and American Stock Transfer and Trust Company
as Rights Agent.

BUSINESS COMBINATION STATUTE. The Massachusetts "Business Combination" statute
provides that, if a person acquires 5% or more of the stock of a Massachusetts
corporation without the approval of its board of directors (an "interested
stockholder"), he or she may not engage in certain transactions with the
corporation for a period of three years. There are certain exceptions to this
prohibition; for example, if the board of directors approves the acquisition of
stock or the transaction prior to the time that the person became an interested
stockholder, or if the interested stockholder acquires 90% of the voting stock
of the corporation (excluding voting stock owned by directors who are also
officers and certain employee stock plans) in one transaction, or if the
transaction is approved by the board of directors and by the affirmative vote of
two-thirds of the outstanding voting stock which is not owned by the interested
stockholder, the prohibition does not apply.

Genzyme is subject to the Massachusetts Business Combination statute
unless it elects not to be governed by the statute in the Genzyme Charter or the
By-Laws. Genzyme has not made such election and does not currently intend to
make such an election.

CONTROL SHARE ACQUISITION STATUTE. The Massachusetts "Control Share Acquisition"
statute provides that a person (the "acquiror") who makes a bona fide offer to
acquire, or acquires, shares of stock of a corporation that when combined with
shares already owned, would increase the acquiror's ownership to at least 20%,
33 1/3% or a majority of the voting stock of the corporation, must obtain the
approval of a majority in interest of the shares held by all stockholders,
excluding shares held by the acquiror and the officers and inside directors of
the corporation, in order to vote the shares acquired. The statute does not
require the acquiror to consummate the purchase before the stockholder vote is
taken.

<PAGE> 50

The Control Share Acquisition statute permits a Massachusetts corporation
to elect not to be governed by these provisions by including such an election in
its articles of incorporation or by-laws. The By-Laws contain a provision
pursuant to which Genzyme elected not to be governed by the Massachusetts
Control Share Acquisition statute. However, if at a future date the Genzyme
Board determines that it is in the best interests of Genzyme and its
stockholders that Genzyme be governed by the statute, the By-Laws may be amended
to permit it to be governed by such statute. Any such amendment, however, would
apply only to acquisitions crossing the thresholds which occur after the
effective date of such amendment.

See "Risk Factors - Risks Related to GTR - Possible Adverse Effect of
Anti-Takeover Provisions."

DETERMINATIONS BY THE GENZYME BOARD

Any determination made by the Genzyme Board in good faith under any of the
provisions described above will be final and binding on all stockholders of
Genzyme.

TRANSFER AGENT AND REGISTRAR

American Stock Transfer and Trust Company is the registrar and transfer
agent for each series of Genzyme common stock.

MANAGEMENT AND ACCOUNTING POLICIES GOVERNING
THE RELATIONSHIP OF GENZYME DIVISIONS

The Genzyme Board has adopted the following policies to govern the
management of Genzyme General, GTR and GMO. Except as otherwise provided in the
policies, the Genzyme Board may further modify or rescind the policies in its
sole discretion without approval of the stockholders, subject only to the
Genzyme Board's fiduciary duty to Genzyme's stockholders. The Genzyme Board may
also adopt additional policies depending upon the circumstances. Any
determination of the Genzyme Board to modify or rescind the policies, or to
adopt additional policies, including any such decision that would have disparate
impacts upon holders of the common stock representing the three divisions, would
be governed by the principles of Massachusetts law discussed under "Risk Factors
- - Risks Related to Genzyme Tracking Stock - No Rights or Additional Duties with
Respect to the Divisions; Potential Conflicts." In addition, generally accepted
accounting principles require that any change in policy be preferable (in
accordance with such principles) to the previous policy.

PURPOSE OF THE TISSUE REPAIR AND MOLECULAR ONCOLOGY DIVISIONS

The purpose of GTR is to create a business with a comprehensive approach
to the field of tissue repair by developing and commercializing a portfolio of
novel products for the treatment and prevention of serious tissue injury
(excluding products developed on behalf of Genzyme Development Partners, L.P.).
The purpose of GMO is to create a focused, integrated oncology business that
will develop and commercialize novel therapeutic and diagnostic products and
services based upon molecular tools and genomic information. In addition to the
programs initially assigned to each of GTR and GMO, it is expected that the
product and service portfolio of each division will expand through the addition
of complementary programs, products and services developed either internally or
externally to the division, including acquiring or in-licensing programs,
products and services from outside of Genzyme. Each of GTR and GMO will be
operated and managed similarly to Genzyme General.

REVENUE ALLOCATION

Other than revenues received in connection with transactions subject to
the policy regarding Other Interdivision Transactions, revenues from the sale of
a division's products and services shall be credited to that division.

<PAGE> 51

EXPENSE ALLOCATION

Other than expenses incurred in connection with transactions subject to
the policy regarding Other Interdivision Transactions, all direct expenses shall
be charged to the division for the benefit of which they are incurred. Corporate
and general and administrative expenses or other indirect costs will be
allocated to each division in a reasonable and consistent manner based on
utilization by the division of the services to which such costs relate.

TAX ALLOCATIONS

Income taxes shall be allocated to each division based upon the financial
statement income, taxable income, credits and other amounts properly allocable
to such division under generally accepted accounting principles as if each
division were a separate taxpayer; provided, however, that as of the end of any
fiscal quarter of Genzyme, any projected tax benefit attributable to any
division that cannot be utilized by such division to offset or reduce its
current or deferred income tax expense may be allocated to the other divisions
in proportion to their taxable income without any compensating payment or
allocation.

ACQUISITIONS OF PROGRAMS, PRODUCTS OR ASSETS

Upon the acquisition by Genzyme from a third party of any programs,
products or assets (whether by acquisition of assets or stock, merger,
consolidation or otherwise), the aggregate cost of the acquisition and the
programs, products or assets acquired shall be allocated among the divisions of
Genzyme. In the case of material acquisitions, such allocation shall be made in
a manner determined by the Genzyme Board to be fair and reasonable to each
division and to holders of the common stock representing each division, taking
into account such matters as the Genzyme Board and its financial advisors, if
any, deem relevant. Any such determination by the Genzyme Board will be final
and binding on all holders of common stock.

DISPOSITION OF PROGRAMS, PRODUCTS OR ASSETS

Upon any sale, transfer, assignment or other disposition by Genzyme of any
product, program or asset not consisting of all or substantially all of the
assets of a division, all proceeds from such disposition shall be allocated to
the division to which the program, product or asset had been allocated. If the
program, product or asset was allocated to more than one division, the proceeds
of the disposition shall be allocated among such divisions based on their
respective interests in such program, product or asset. Such allocation shall be
made in a manner determined by the Genzyme Board to be fair and reasonable to
such divisions and to holders of the common stock representing such divisions,
taking into account such matters as the Genzyme Board and its financial
advisors, if any, deem relevant. Any such determination by the Genzyme Board
will be final and binding on all holders of common stock.

INTERDIVISION ASSET TRANSFERS

The Genzyme Board may at any time and from time to time reallocate any
program, product or other asset from one division to any other division. All
such reallocations shall be done at fair market value, determined by the Genzyme
Board, taking into account, in the case of a program under development, the
commercial potential of such program, the phase of clinical development of such
program, the expenses associated with realizing any income from such program,
the likelihood and timing of any such realization and other matters that the
Genzyme Board and its financial advisors, if any, deem relevant. The
consideration for such reallocation may be paid by one division to another in
cash or other consideration with a value equal to the fair market value of the
assets being reallocated or, in the case of a reallocation of assets from
Genzyme General to GTR or to GMO, the Genzyme Board may elect to account for
such reallocation as an increase in the Designated Shares representing the
division to which such assets are reallocated in accordance with the provisions
of the Genzyme Charter.

<PAGE> 52

Notwithstanding the foregoing, no Key GTR Program or Key GMO Program, as
defined below, may be transferred out of GTR or GMO, respectively, without a
class vote of the holders of the common stock representing the division from
which such Key GTR Program or Key GMO Program is to be removed unless the
Genzyme Board determines that (i) in the case of a Key GTR Program, such Key
GTR Program has application outside of the field of tissue repair (in which
case it may be transferred out only for the non-tissue repair applications) and
(ii) in the case of a Key GMO Program, such Key GMO Program has application
outside of the field of oncology (in which case it may be transferred out only
for the non-oncology applications; provided, however, that the SAGE Service (as
defined below) may not be transferred out of GMO for any application without
the approval of the holders of GMO Stock voting as a separate class).

A "Key GTR Program" is any of the following:

(i) Vianain(R) for debridement of necrotic or damaged tissue;

(ii) TGF-(beta)(2) for all indications licensed from Celtrix
Pharmaceuticals, Inc. as of December 16, 1994;

(iii) Epicel(SM) cultured epithelial cell autografts for tissue
replacement or repair;

(iv) Acticel(SM) cultured epithelial cell allografts for tissue
replacement or repair;

(v) Carticel(TM) autologous cultured chondrocytes; and

(vi) any additional tissue repair program or product being
developed from time to time in GTR which (a) constituted 20% or more of the
research and development budget of GTR in any one of the three most recently
completed fiscal years or (b) has had a cumulative investment of $8 million or
more in research and development expenses by GTR.

A "Key GMO Program" is any of the following:

(i) use of the Serial Analysis of Gene Expression technology
licensed from the Johns Hopkins University for third parties (the "SAGE
Service");

(ii) the clinical program developing adenovirus vectors containing
the tumor antigens Ad-MART 1 or Ad-gp100 for the treatment of melanoma;

(iii) the "suicide" gene therapy research program developing
adenovirus and lipid vectors containing genes to enhance chemotherapy for
oncology indications;

(iv) the research program developing adenovirus and lipid
vectors containing tumor suppressor genes for oncology indications;

(v) the research program developing adenovirus and lipid vectors
containing genes to regulate the immune system for oncology indications,
including heat shock proteins;

(vi) the research program developing antibody-based gene therapy
for the treatment of tumors; and

(vii) any additional program, product or service being developed
from time to time in GMO which (a) constituted 20% or more of the research and
development budget of GMO in any one of the three most recently completed fiscal
years or (b) has had a cumulative investment of $8 million or more in research
and development expenses by GMO.

<PAGE> 53

The foregoing policies regarding transfers of assets between divisions
will not be changed by the Genzyme Board without the approval of the holders of
the GTR Stock and the GMO Stock, each voting as a separate class; provided,
however, that if a policy change affects GTR or GMO alone, only holders of
shares representing the affected division will be entitled to a class vote on
such matter.

OTHER INTERDIVISION TRANSACTIONS

This policy shall cover interdivision transactions other than asset
transfers, which shall be subject to the policy regarding Interdivision Asset
Transfers. From time to time, a division may engage in transactions directly
with one or more other divisions or jointly with one or more other divisions and
one or more third parties. Such transactions may include agreements by one
division to provide products and services for use by another division and joint
ventures or other collaborative arrangements involving more than one division to
develop new products and services jointly and with third parties. Such
transactions shall be subject to the following conditions:

(i) Research performed by one division for the benefit of another
division will be charged to the division for which work is performed on a cost
basis. Such costs shall be allocated in the manner described above under
"Expense Allocation," and the division performing the research will not
recognize revenue as a result of performing such research.

(ii) Corporate and general and administrative services will be
provided by each division to any other division requesting such services on a
cost basis and such costs shall be allocated in the manner described above under
"Expense Allocation."

(iii) Other than research, corporate and general and administrative
services, interdivision transactions shall be on terms and conditions that would
be obtainable in transactions negotiated at arm's length with unaffiliated third
parties.

(iv) Any interdivision transaction (a) to be performed on terms
and conditions that deviate from the policies set forth in subparagraphs (i),
(ii) or (iii) above and (b) that is material to one or more of the participating
divisions will require approval by the Genzyme Board, which approval shall
include a determination by the Genzyme Board that the transaction is fair and
reasonable to each participating division and to holders of the common stock
representing each such division.

(v) If a division (the "Purchasing Division") requires any
product or service from which another division (the "Selling Division") derives
revenues from sales to third parties (a "Commercial Product or Service"), the
Purchasing Division may solicit from the Selling Division a bid to provide such
Commercial Product or Service in addition to any bids solicited by the
Purchasing Division from third parties. Subject to the determination by the
Genzyme Board that the bid of the Selling Division is fair and reasonable to
each division and to holders of common stock representing each division and that
the Purchasing Division will accept the Selling Division's bid, the Purchasing
Division may accept any bid deemed to offer the most favorable terms and
conditions for providing the Commercial Product or Service sought by the
Purchasing Division.

(vi) Loans may be made from time to time between divisions. Any
such loan of $1 million or less will mature within 18 months and interest will
accrue at the best borrowing rate available to Genzyme for a loan of like type
and duration. Amounts borrowed in excess of $1 million will require approval of
the Genzyme Board, which approval shall include a determination by the Genzyme
Board that the material terms of such loan, including the interest rate and
maturity date, are fair and reasonable to each participating division and to
holders of the common stock representing such division.

<PAGE> 54

ACCESS TO TECHNOLOGY AND KNOW-HOW

Each of Genzyme General, GTR and GMO will have free access to all
technology and know-how of Genzyme that may be useful in such division's
business, subject to any obligations or limitations applicable to Genzyme.

DISPOSITION OF GTR DESIGNATED SHARES AND GMO DESIGNATED SHARES

(i) The GTR Designated Shares and the GMO Designated Shares may
be (a) issued upon the exercise or conversion of outstanding stock options,
warrants or convertible securities allocated to Genzyme General, (b) subject to
the restrictions set forth below under "Issuance of Additional Shares of Any
Series of Common Stock," sold for any valid business purpose or (c) distributed
as a dividend to the holders of shares of GGD Stock, all as determined from time
to time by the Genzyme Board, subject to the following policies regarding annual
distributions.

(ii) If, as of May 31 of each year starting May 31, 1997, the
number of GTR Designated Shares on such date (not including those reserved for
issuance with respect to stock options, stock purchase rights, warrants or other
securities convertible into or exercisable for shares of GGD Stock outstanding
on such date ("GGD Convertible Securities") as a result of anti-dilution
adjustments required by the terms of such instruments or approved by the Genzyme
Board) exceeds ten percent (10%) of the number of shares of GTR Stock then
issued and outstanding, then substantially all GTR Designated Shares will be
distributed to holders of record of GGD Stock subject to reservation of a number
of such shares equal to the sum of:

(a) the number of GTR Designated Shares reserved for
issuance upon the exercise or conversion of GGD Convertible Securities and

(b) the number of GTR Designated Shares reserved by the
Genzyme Board as of such date for sale not later than six months after such
date, the proceeds of which sale will be allocated to Genzyme General.

(iii) If, as of November 30 of each year starting November 30,
1998, the number of GMO Designated Shares on such date (not including those
reserved for issuance with respect to GGD Convertible Securities as a result of
anti-dilution adjustments required by the terms of such instruments or approved
by the Genzyme Board) exceeds ten percent (10%) of the number of shares of GMO
Stock then issued and outstanding, then substantially all GMO Designated Shares
will be distributed to holders of record of GGD Stock, subject to reservation of
a number of such shares equal to the sum of:

(a) the number of GMO Designated Shares reserved for
issuance upon the exercise or conversion of GGD Convertible Securities and

(b) the number of GMO Designated Shares reserved by the
Genzyme Board as of such date for sale not later than six months after such
date, the proceeds of which sale will be allocated to Genzyme General;

provided, however, that if, prior to November 30, 1998, Genzyme has completed an
initial public offering of GMO Stock, Genzyme may defer the distribution of GMO
Designated Shares provided in this policy until the later of November 30, 1998
or 360 days after the date such offering is completed.

ISSUANCE AND SALE OF ADDITIONAL SHARES OF COMMON STOCK

When additional shares of common stock are issued and sold by Genzyme,
Genzyme will identify (i) the number of such shares issued and sold for the
account of the division to which they relate, the proceeds of which will be
allocated to and reflected in the financial statements of such division and (ii)
the number of such shares issued and sold that shall reduce the number of
Designated Shares of such division. Notwithstanding the

<PAGE> 55

foregoing, Genzyme will not sell any GTR Designated Shares or GMO Designated
Shares (except upon exercise or conversion of options, warrants or convertible
securities issued by Genzyme General that were adjusted as a result of a
dividend of GTR Stock or GMO Stock paid to holders of GGD Stock) unless (i) the
Genzyme Board determines that GTR or GMO, as the case may be, has cash
sufficient to fund its operations for at least the next 12 months or (ii) shares
of GTR Stock or GMO Stock, as the case may be, are concurrently being sold for
the account of GTR or GMO, respectively, in an amount that will produce proceeds
sufficient to fund such division's cash needs for the next 12 months.

OPEN MARKET PURCHASES OF SHARES OF COMMON STOCK

Genzyme may make open market purchases of any series of its common stock
in accordance with applicable securities law requirements; provided, however,
that in no event shall any such purchases be made if as an immediate result
thereof the number of Designated Shares representing a division will exceed 60%
of the number of shares of such division outstanding plus such number of
Designated Shares. Notwithstanding the foregoing, within 90 days of any open
market purchase of the common stock representing any division, Genzyme may not
exercise the right provided under the Genzyme Charter to exchange shares
representing such division for cash and/or shares of GGD Stock.

CLASS VOTING

In addition to any stockholder approval required by Massachusetts law,
whenever the approval of the holders of the common stock representing a division
is required to take any action pursuant to these policies or the Genzyme
Charter, such requirement shall be satisfied if a meeting of the holders of the
common stock representing such division is held at which a quorum is present and
the votes cast in favor of the proposed action exceed the votes cast against.

NON-COMPETE

Genzyme will not develop products or services outside of GTR or GMO which
compete or would compete with products or services being developed or sold by
GTR or GMO, respectively, other than through joint ventures or other
collaborative arrangements involving more than one division to develop new
products and services jointly and with third parties, which transactions shall
be subject to the conditions set forth in the policy regarding Other
Interdivision Transactions.

<PAGE> 56

UNDERWRITING

Under the terms and subject to the conditions contained in an Underwriting
Agreement dated ______________, 1997 (the "Underwriting Agreement"), the
Underwriters named below (the "Underwriters"), for whom Credit Suisse First
Boston Corporation, Cowen & Company and PaineWebber Incorporated are acting as
representatives (the "Representatives"), have severally but not jointly agreed
to purchase from Genzyme the following respective numbers of shares of GTR
Stock:

<TABLE>
<CAPTION>
Number of
Underwriter Shares
----------- ---------
<S> <C>
Credit Suisse First Boston Corporation..........
Cowen & Company.................................
PaineWebber Incorporated........................
</TABLE>

Total........................................ =========

The Underwriting Agreement provides that the obligations of the
Underwriters are subject to certain conditions precedent and that the
Underwriters will be obligated to purchase all of the shares of GTR Stock
offered hereby (other than those shares covered by the over-allotment option
described below) if any are purchased. The Underwriting Agreement provides that,
in the event of a default by an Underwriter, in certain circumstances the
purchase commitments of non-defaulting Underwriters may be increased or the
Underwriting Agreement may be terminated.

Genzyme has granted to the Underwriters an option, expiring at the close
of business on the 30th day after the date of this Prospectus, to purchase up to
_________ additional shares at the initial public offering price less the
underwriting discounts and commissions, all as set forth on the cover page of
this Prospectus. Such option may be exercised only to cover over-allotments in
the sale of the shares of GTR Stock. To the extent such option is exercised,
each Underwriter will become obligated, subject to certain conditions, to
purchase approximately the same percentage of such additional shares of GTR
Stock as it was obligated to purchase pursuant to the Underwriting Agreement.

Genzyme has been advised by the Representatives that the Underwriters
propose to offer the shares of GTR Stock to the public initially at the public
offering price set forth on the cover page of this Prospectus and, through the
Representatives, to certain dealers at such price less a concession of $____ per
share, and the Underwriters and such dealers may allow a discount of $____ per
share on sales to certain other dealers. Thereafter the public offering price
and concession and discount to dealers may be changed by the Representatives.

<PAGE> 57
Genzyme has agreed that it will not offer, sell, contract to sell,
announce its intention to sell, pledge, hypothecate, grant any option to
purchase or otherwise dispose of, directly on indirectly, or file with the
Securities and Exchange Commission a registration statement under the
Securities Act relating to, any shares of GTR Stock or securities convertible
into or exchangeable or exercisable for any shares of GTR Stock, other than
pursuant to employee benefit plans and upon the exercise or conversion of
outstanding warrants and convertible notes, without the prior written consent
of Credit Suisse First Boston Corporation for a period of 90 days after the
date of this Prospectus.

Genzyme has agreed to indemnify the Underwriters against certain
liabilities, including civil liabilities under the Securities Act, or contribute
to payments which the Underwriters may be required to make in respect thereof.

This offering is being conducted in accordance with the applicable
provisions of Rule 2720 of the National Association of Securities Dealers, Inc.
Conduct Rules because Proprietary Convertible Investment Group, Inc. ("PCIG"),
an affiliate of Credit Suisse First Boston Corporation, holds more than 10% of
the subordinated debt of Genzyme. Rule 2720 requires that the public offering
price of the GTR Stock offered hereby not be higher than that recommended by a
"qualified independent underwriter" meeting certain qualifications.
Accordingly, PaineWebber Incorporated is acting as the qualified independent
underwriter in pricing the offering and conducting due diligence. The public
offering price of the GTR Stock offered hereby is no higher than that
recommended by PaineWebber Incorporated. PaineWebber Incorporated will not
receive any compensation in connection with its acting as a qualified
independent underwriter. In addition, no NASD member participating in the
distribution will be permitted to confirm sales to accounts over which it
exercises discretionary authority without the prior specific written consent of
the customer.

During and after the offering, the Representatives, on behalf of the
Underwriters, may engage in over-allotment, stabilizing transactions, syndicate
covering transactions, penalty bids and "passive" market making in accordance
with Regulation M under the Exchange Act. Over-allotment involves syndicate
sales in excess of the offering size, which creates a syndicate short position.
Stabilizing transactions permit bids to purchase the GTR Stock so long as the
stabilizing bids do not exceed a specified maximum. Syndicate covering
transactions involve purchases of the GTR Stock in the open market after the
distribution has been completed in order to cover syndicate short positions.
Penalty bids permit the Representatives to reclaim a selling concession from a
syndicate member when the shares of GTR Stock sold by such syndicate member are
purchased in a syndicate covering transaction or to cover syndicate short
positions. In "passive" market making, market makers in the GTR Stock who are
underwriters or prospective underwriters may, subject to certain limitations,
make bids for or purchases of the GTR Stock until the time, if any, at which a
stabilizing bid is made. Such stabilizing transactions, syndicate covering
transactions and penalty bids may cause the price of the GTR Stock to be higher
than it would otherwise be in the absence of such transactions. These
transactions may be effected on the Nasdaq National Market or otherwise and, if
commenced, may be discontinued at any time.

Credit Suisse First Boston Corporation and PaineWebber Incorporated
provided financial advisory services to Genzyme and BioSurface, respectively, in
connection with Genzyme's acquisition of BioSurface in December 1994. The
Representatives also acted as underwriters in Genzyme's public offerings of GGD
Stock and GTR Stock in 1995. PaineWebber Incorporated provided financial
advisory services to PharmaGenics, Inc. in connection with its acquisition by
Genzyme in June 1997. In February 1997 Credit Suisse First Boston (Hong Kong)
Limited, an affiliate of Credit Suisse First Boston Corporation, purchased debt
securities of Genzyme convertible into GTR Stock within six months of the
acquisition of such securities. In addition, the Representatives and certain
other Underwriters have from time to time provided other investment banking
services to Genzyme for customary fees and may continue to do so in the future.

NOTICE TO CANADIAN RESIDENTS

RESALE RESTRICTIONS

The distribution of the GTR Stock in Canada is being made only on a
private placement basis exempt from the requirement that Genzyme prepare and
file a prospectus with the securities regulatory authorities in each province
where trades of GTR Stock are effected. Accordingly, any resale of the GTR Stock
in Canada must be made in accordance with applicable securities laws which will
vary depending on the relevant jurisdiction, and which may require resales to be
made in accordance with available statutory exemptions or pursuant to a
discretionary exemption granted by the applicable Canadian securities regulatory
authority. Purchasers are advised to seek legal advice prior to any resale of
the GTR Stock.

REPRESENTATIONS OF PURCHASERS

Each purchaser of GTR Stock in Canada who receives a purchase confirmation
will be deemed to represent to Genzyme and the dealer from whom such purchase
confirmation is received that (i) such purchaser is entitled under applicable
provincial securities laws to purchase such GTR Stock without the benefit of a

<PAGE> 58

prospectus qualified under such securities laws, (ii) where required by law,
that such purchaser is purchasing as principal and not as agent, and (iii) such
purchaser has reviewed the text above under "Resale Restrictions."

RIGHTS OF ACTION (ONTARIO PURCHASERS)

The securities being offered are those of a foreign issuer and Ontario
purchasers will not receive the contractual right of action prescribed by
section 32 of the Regulation under the Securities Act (Ontario). As a result,
Ontario purchasers must rely on other remedies that may be available, including
common law rights of action for damages or rescission or rights of action under
the civil liability provisions of the U.S. federal securities laws.

ENFORCEMENT OF LEGAL RIGHTS

All of the issuer's directors and officers as well as the experts named
herein may be located outside of Canada and, as a result, it may not be possible
for Canadian purchasers to effect service of process within Canada upon the
issuer or such persons. All or a substantial portion of the assets of the issuer
and such persons may be located outside of Canada and, as a result, it may not
be possible to satisfy a judgment against the issuer or such persons in Canada
or to enforce a judgment obtained in Canadian courts against such issuer or
persons outside of Canada.

NOTICE TO BRITISH COLUMBIA RESIDENTS

A purchaser of GTR Stock to whom the Securities Act (British Columbia)
applies is advised that such purchaser is required to file with the British
Columbia Securities Commission a report within ten days of the sale of any GTR
Stock acquired by such purchaser pursuant to this offering. Such report must be
in the form attached to British Columbia Securities Commission Blanket Order BOR
#95/17, a copy of which may be obtained from Genzyme. Only one such report must
be filed in respect of the GTR Stock acquired on the same date and under the
same prospectus exemption.

TAXATION AND ELIGIBILITY FOR INVESTMENT

Canadian purchasers of GTR Stock should consult their own legal and tax
advisors with respect to the tax consequences of an investment in the GTR Stock
in the particular circumstances and with respect to the eligibility of the GTR
Stock for investment by the purchaser under relevant Canadian legislation.

LEGAL OPINIONS

The validity of the GTR Stock offered hereby will be passed upon for
Genzyme by Palmer & Dodge LLP, Boston, Massachusetts. Certain legal matters
will be passed upon for Genzyme by Peter Wirth, Executive Vice President and
Chief Legal Officer of Genzyme. As of August 1, 1997, Mr. Wirth beneficially
owned 39,609 and 9,540 shares of GGD Stock and GTR Stock, respectively,
including 39,106 and 9,540 shares of GGD Stock and GTR Stock, respectively,
subject to options exercisable within 60 days. Certain legal matters will be
passed upon for the Underwriters by Cahill Gordon & Reindel (a partnership
including a professional corporation), New York, New York.

<PAGE> 59

EXPERTS

The consolidated balance sheets of Genzyme as of December 31, 1995 and
1996 and the related consolidated statements of operations, stockholders' equity
and cash flows for each of the three years in the period ended December 31, 1996
included in Genzyme's Annual Report on Form 10-K for the year ended December 31,
1996, as amended, and the financial statement schedule appearing therein,
incorporated by reference into this Prospectus, have been incorporated herein in
reliance on the report of Coopers & Lybrand L.L.P., independent accountants,
given on the authority of that firm as experts in accounting and auditing.

The combined balance sheets of Genzyme General and GTR as of December 31,
1995 and 1996, and the related combined statements of operations and cash flows
for each group for each of the three years in the period ended December 31,
1996 included in Genzyme's Annual Report on Form 10-K for the year ended
December 31, 1996, as amended and the financial statement schedule appearing
therein, have also been incorporated by reference herein in reliance on the
respective reports of Coopers & Lybrand L.L.P., independent accountants, given
on the authority of that firm as experts in accounting and accounting.

The combined balance sheets of GMO as of December 31, 1995 and 1996, and
the related combined statements of operations and deficit accumulated during the
development stage, cash flows and division equity for the period from
December 1, 1994 (Date of Inception) through December 31, 1994, for the years
ended December 31, 1995 and 1996 and cumulative for the period from December 1,
1994 (Date of Inception) through December 31, 1996, have also been incorporated
by reference herein in reliance on the report of Coopers & Lybrand L.L.P.,
independent accountants, given on the authority of that firm as experts in
accounting and auditing.

The audited financial statements of PharmaGenics, Inc. incorporated by
reference in this Prospectus have been audited by Arthur Andersen LLP,
independent public accountants, as indicated in their report with respect
thereto, and are incorporated herein by reference in reliance upon the authority
of said firm as experts in giving said reports.

AVAILABLE INFORMATION

Genzyme has filed with the Securities and Exchange Commission (the
"Commission") a Registration Statement on Form S-3 (the "Registration
Statement") under the Securities Act with respect to the GTR Stock offered
hereby. This Prospectus does not contain all of the information set forth in the
Registration Statement and the exhibits thereto, certain parts of which are
omitted in accordance with the rules and regulations of the Commission.
Statements made in this Prospectus as to the contents of any contract, agreement
or other document referred to are not necessarily complete, but do provide an
accurate summary of the material terms thereof. 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 Registration Statement and any amendments
thereto, including exhibits filed or incorporated by reference as a part
thereof, are available for inspection and copying at the Commission's offices as
described below.

Genzyme is subject to the informational requirements of the Exchange Act,
and, in accordance therewith, files periodic reports, proxy statements and other
information with the Commission. Reports, proxy and information statements filed
pursuant to Sections 14(a) and 14(c) of the Exchange Act and other information
filed with the Commission, as well as copies of the Registration Statement, can
be inspected and copied at the public reference facilities maintained by the
Commission at Room 1024, 450 Fifth Street, N.W., Judiciary Plaza, Washington,
D.C. 20549, and at the following Regional Offices of the Commission: Midwest
Regional Office, 500 West Madison Street, Suite 1400, Chicago, Illinois 60611;
and Northeast Regional Office, 7 World Trade Center, 13th Floor, New York, New
York 10048. Copies of such material can also be obtained at prescribed rates
from the Public Reference Section of the Commission at its principal office at
450 Fifth Street, N.W., Judiciary Plaza, Washington, D.C. 20549. Such material
may also be accessed electronically by means of the Commission's home page on
the Internet at http://www.sec.gov.

<PAGE> 60

INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

Genzyme hereby incorporates in this Prospectus by reference the following
documents heretofore filed with the Commission (File No. 0-14680) pursuant to
the Exchange Act: (i) Genzyme's Annual Report on Form 10-K for the year ended
December 31, 1996, as amended by Form 10-K/A filed on June 30, 1997; (ii)
Genzyme's Quarterly Reports on Form 10-Q for the quarters ended March 31, 1997
and June 30, 1997; (iii) Genzyme's Current Reports on Form 8-K filed with the
Commission on February 4, 1997, April 1, 1997 and June 30, 1997; (iv) the
description of GTR Stock and GTR Stock Purchase Rights contained in Genzyme's
Registration Statement on Form 8-A filed with the Commission on June 18, 1997.

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

Genzyme hereby undertakes to provide without charge to each person to whom
a copy of this Prospectus has been delivered, upon the written or oral request
of any such person, a copy of any and all of the documents referred to above
which have been or may be incorporated in this Prospectus by reference, other
than exhibits to such documents which are not specifically incorporated by
reference into such documents. Requests for such copies should be directed to
the executive offices of Genzyme Corporation, One Kendall Square, Cambridge,
Massachusetts 02139, Attention: Shareholder Services, telephone (617) 252-7526.

<PAGE> 61

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

_______________

TABLE OF CONTENTS

<TABLE>
<CAPTION>
Page
----
<S> <C>
Prospectus Summary....................................
Risk Factors..........................................
Use of Proceeds.......................................
Capitalization........................................
Price Range of GTR Stock and Dividend
Policy..............................................
Genzyme Tissue Repair
Selected Financial Data.............................
GTR Management's Discussion and
Analysis of Financial Condition
and Results of Operations...........................
Additional Financial Data.............................
Business..............................................
Management............................................
Description of Genzyme Capital Stock..................
Management and Accounting Policies
Governing the Relationship of
Genzyme Divisions...................................
Underwriting..........................................
Notice to Canadian Residents..........................
Legal Opinions........................................
Experts ..............................................
Available Information.................................
Incorporation of Certain Documents
by Reference........................................
</TABLE>

GENZYME
TISSUE REPAIR

_________ Shares
Genzyme Tissue Repair Division
Common Stock
($.01 par value)

PROSPECTUS

Credit Suisse First Boston

Cowen & Company

PaineWebber Incorporated

<PAGE> 62
PART II

INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

The expenses to be borne by Genzyme in connection with this offering of
GTR Stock are estimated as follows:

SEC registration fee.................... $12,121
Blue Sky and NASD fees and expenses..... $ 4,500
Printing and engraving expenses......... $ *
Accounting fees and expenses............ $ *
Legal fees and expenses................. $ *
Transfer Agent and Registrar fees....... $ *
Miscellaneous expenses.................. $ *
-------
Total.............................. $ *
=======
</TABLE>

* To be completed by amendment.

All of the above figures, except the SEC registration fee, are estimates.

ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS

Section 67 of chapter 156B of the Massachusetts Business Corporation Law
grants Genzyme the power to indemnify any director, officer, employee or agent
to whatever extent permitted by Genzyme's Restated Articles of Organization,
By-Laws or a vote adopted by the holders of a majority of the shares entitled to
vote thereon, unless the proposed indemnitee has been adjudicated in any
proceeding not to have acted in good faith in the reasonable belief that his or
her actions were in the best interests of Genzyme or, to the extent that the
matter for which indemnification is sought relates to service with respect to an
employee benefit plan, in the best interests of the participants or
beneficiaries of such employee benefit plan. Such indemnification may include
payment by Genzyme of expenses incurred in defending a civil or criminal action
or proceeding in advance of the final disposition of such action or proceeding,
upon receipt of an undertaking by the person indemnified to repay such payment
if he or she shall be adjudicated to be not entitled to indemnification under
the statute.

Article VI of Genzyme's By-Laws provides that Genzyme shall, to the extent
legally permissible, indemnify each person who may serve or who has served at
any time as a director or officer of Genzyme or of any of its subsidiaries, or
who at the request of Genzyme may serve or at any time has served as a director,
officer or trustee of, or in a similar capacity with, another organization or an
employee benefit plan, against all expenses and liabilities (including counsel
fees, judgments, fines, excise taxes, penalties and amounts payable in
settlements) reasonably incurred by or imposed upon such person in connection
with any threatened, pending or completed action, suit or other proceeding,
whether civil, criminal, administrative or investigative, in which he or she may
become involved by reason of his or her serving or having served in such
capacity (other than a proceeding voluntarily initiated by such person unless he
or she is successful on the merits, the proceeding was authorized by Genzyme or
the proceeding seeks a declaratory judgment regarding his or her own conduct);
provided that no indemnification shall be provided for any such person with
respect to any matter as to which he or she shall have been finally adjudicated
in any proceeding not to have acted in good faith in the reasonable belief that
his or her action was in the best interests of Genzyme or, to the extent such
matter relates to service with respect to any employee benefit plan, in the best
interests of the participants or beneficiaries of such employee of such employee
benefit plan; and provided, further, that as to any matter disposed of by a

II-1

<PAGE> 63

compromise payment by such person, pursuant to a consent decree or otherwise,
the payment and indemnification thereof have been approved by Genzyme, which
approval shall not unreasonably be withheld, or by a court of competent
jurisdiction. Such indemnification shall include payment by Genzyme of expenses
incurred in defending a civil or criminal action or proceeding in advance of the
final disposition of such action or proceeding, upon receipt of an undertaking
by the person indemnified to repay such payment if he or she shall be
adjudicated to be not entitled to indemnification under Article VI, which
undertaking may be accepted without regard to the financial ability of such
person to make repayment.

The indemnification provided for in Article VI is a contract right inuring
to the benefit of the directors, officers and others entitled to
indemnification. In addition, the indemnification is expressly not exclusive of
any other rights to which such director, officer or other person may be entitled
by contract or otherwise under law, and inures to the benefit of the heirs,
executors and administrators of such a person.

Genzyme also has in place agreements with certain officers and directors
which affirm Genzyme's obligation to indemnify them to the fullest extent
permitted by law and contain various procedural and other provisions which
expand the protection afforded by Genzyme's By-Laws.

Section 13(b)(1 1/2) of chapter 156B of the Massachusetts Business
Corporation Law provides that a corporation may, in its articles of
organization, eliminate a director's personal liability to the corporation and
its stockholders for monetary damages for breaches of fiduciary duty, except in
circumstances involving (i) a breach of the director's duty of loyalty to the
corporation or its stockholders, (ii) acts or omissions not in good faith or
which involve intentional misconduct or a knowing violation of law, (iii)
unauthorized distributions and loans to insiders and (iv) transactions from
which the director derived an improper personal benefit. Article VI.C.5. of
Genzyme's Restated Articles of Organization provides that no director shall be
personally liable to Genzyme or its stockholders for monetary damages for any
breach of fiduciary duty as a director, except to the extent that such
exculpation is not permitted under the Massachusetts Business Corporation Law as
in effect when such liability is determined.

ITEM 16. EXHIBITS

See Exhibit Index immediately following the signature page.

ITEM 17. UNDERTAKINGS

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

(b) Insofar as indemnification for liabilities arising under the
Securities Act of 1933 may be permitted to directors, officers and controlling
persons of the Registrant pursuant to the provisions referred to in Item 15
hereof, 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 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

II-2

<PAGE> 64

whether such indemnification by it is against public policy as expressed in the
Act and will be governed by the final adjudication of such issue.

(1) For purposes of determining any liability under the Securities Act
of 1933, 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 part of this registration
statement as of the time it was declared effective.

(2) For the purposes of determining any liability under the Securities
Act of 1933, 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-3

<PAGE> 65

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Cambridge, Commonwealth of Massachusetts, on
September 3, 1997.

GENZYME CORPORATION

By: /s/ David J. McLachlan
---------------------------------------------
David J. McLachlan, Executive Vice President,
Finance and Chief Financial Officer

POWER OF ATTORNEY

We, the undersigned officers and directors of Genzyme Corporation, hereby
severally constitute and appoint Henri A. Termeer, David J. McLachlan, Peter
Wirth, Evan M. Lebson and Mark J. Enyedy, and each of them singly, our true and
lawful attorneys, with full power to them in any and all capacities, to sign any
amendments to this Registration Statement on Form S-3 (including Pre-and
Post-Effective Amendments) and any related registration statements filed
pursuant to Rule 462(b) under the Securities Act of 1933, and to file the same,
with exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission, hereby ratifying and confirming all that
each of said attorneys-in-fact may do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and on the dates indicated.

SIGNATURE TITLE
- --------- -----
<S> <C> <C>

/s/ Henri A. Termeer Director and Principal September 3, 1997
- ----------------------------------
Henri A. Termeer Executive Officer

/s/ David J. Mclachlan Principal Financial and September 3, 1997
- ----------------------------------
David J. McLachlan Accounting Officer

/s/ Constantine E. Anagnostopoulos Director September 3, 1997
- ----------------------------------
Constantine E. Anagnostopoulos

/s/ Douglas A. Bertiaume Director September 3, 1997
- ----------------------------------
Douglas A. Berthiaume

/s/ Henry E. Blair Director September 3, 1997
- ----------------------------------
Henry E. Blair

/s/ Robert J. Carpenter Director September 3, 1997
- ----------------------------------
Robert J. Carpenter

Director September __, 1997
__________________________________
Charles L. Cooney

/s/ Henry R. Lewis Director September 3, 1997
- ----------------------------------
Henry R. Lewis

</TABLE>

<PAGE> 66

EXHIBIT INDEX

EXHIBIT SEQUENTIAL
NO. DESCRIPTION PAGE NO.
- -------- ----------- ----------
<S> <C> <C>

1.1 Underwriting Agreement dated as of ___________, 1997
between Genzyme and Credit Suisse First Boston
Corporation. To be filed by amendment.

4.1 Restated Articles of Organization of Genzyme. Filed
as Exhibit 1 to Genzyme's Registration Statement on
Form 8-A filed with the Commission
on June 18, 1997, and incorporated herein by reference.

4.2 Series Designation for Genzyme Molecular Oncology Division
Common Stock. Filed as Exhibit 2 to Genzyme's Registration
Statement on Form 8-A filed with the Commission on June 18,
1997, and incorporated herein by reference.

4.3 Series Designation for the Series A, Series B and Series C Junior
Participating Preferred Stock of Genzyme. Filed as Exhibit 3 to
Genzyme's Registration Statement on Form 8-A filed with the
Commission on June 18, 1997, and incorporated herein by reference.

4.4 By-Laws of Genzyme. Filed as Exhibit 3.2 to Genzyme's Form 8-K
dated December 31, 1991, and incorporated herein by reference.

4.5 Amended and Restated Rights Agreement dated as of June 12, 1997
between Genzyme and American Stock Transfer and Trust Company.
Filed as Exhibit 5 to Genzyme's Registration Statement on Form 8-A
filed with the Commission on June 18, 1997, and incorporated herein
by reference.

5.1 Opinion of Palmer & Dodge LLP. To be filed by amendment.

23.1 Consent of Coopers & Lybrand L.L.P., independent accountants to
Genzyme Corporation. Filed herewith.

23.2 Consent of Arthur Andersen LLP, independent accountants to
PharmaGenics, Inc. Filed herewith.

23.3 Consent of Palmer & Dodge LLP. To be filed by amendment.

24.1 Power of Attorney (included in the signature page hereto).

</TABLE>

<PAGE> 1
EXHIBIT 23.1

CONSENT OF INDEPENDENT ACCOUNTANTS

We consent to the incorporation by reference in this Registration Statement on
Form S-3 of our reports dated February 27, 1997 on our audits of the
consolidated financial statements and financial statement schedule of Genzyme
Corporation, the combined financial statements of and financial statement
schedule of Genzyme General Division and the combined financial and financial
statement schedule of Genzyme Tissue Repair Division as of December 31, 1995 and
1996 and for each of the three years in the period ended December 31, 1996,
which reports are included in Genzyme Corporation's 1996 Annual Report on Form
10-K as amended.

We also consent to the incorporation by reference in this Registration Statement
on Form S-3 of our report dated April 7, 1997 on our audits of the combined
financial statements of Genzyme Molecular Oncology Division as of December 31,
1995 and 1996 and for the period from December 1, 1994 (Date of Inception)
through December 31, 1994, for the years ended December 31, 1995 and 1996 and
cumulative for the period from December 1, 1994 (Date of Inception) through
December 31, 1996, which report is included in Genzyme Corporation's Current
Report on Form 8-K filed with Securities and Exchange Commission on June 30,
1997.

We also consent to the reference to our firm in the Registration Statement under
the captions "Experts" and "Selected Financial Data".

/s/ Coopers & Lybrand L.L.P.

Coopers & Lybrand L.L.P.

Boston, Massachusetts
September 3, 1997

<PAGE> 1

Exhibit 23.2

ARTHUR ANDERSEN LLP

CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

As independent public accountants, we hereby consent to the incorporation by
reference in this registration statement of our report dated March 3, 1997
relating to the financial statements of PharmaGenics, Inc. included in Genzyme
Corporation's report on Form 8-K dated June 18, 1997.

/s/ Arthur Andersen LLP
------------------------------
ARTHUR ANDERSEN LLP

Roseland, New Jersey
August 29, 1997