Exhibit 10.8.3

                           MORTGAGE AND SECURITY AGREEMENT

    This Mortgage and Security Agreement ("Mortgage") is made as of this 26th 
day of  June, 1997, by GTC MASON LABORATORIES, INC. ("Mortgagor"), a 
Massachusetts corporation with a mailing address of 57 Union Street, 
Worcester, MA  01608 to the EMERGING TECHNOLOGY FUND of the GOVERNMENT LAND 
BANK, doing business as MASSDEVELOPMENT ("Lender"), a Massachusetts body 
politic and corporate created by Chapter 212 of the Acts of 1975, as amended, 
having offices at 75 Federal Street, Boston, Massachusetts 02110, as 
Mortgagee.

    In consideration for and to secure payment and performance to Lender of 
all of the Obligations, as that term is defined in subparagraphs (a) through 
(g) below, Mortgagor has granted, bargained and sold, conveyed, aliened, 
released, assigned, transferred, mortgaged and confirmed, granted a security 
interest in and set-over and by these presents does hereby grant, bargain and 
sell, convey, release, assign, transfer, mortgage and confirm unto Lender, 
its successors and assigns, forever WITH MORTGAGE COVENANTS:

    ALL THAT CERTAIN real estate known and designated as 55 Union Street, 
Worcester, County of Worcester, State of Massachusetts, all as more 
particularly described on Exhibit "A" attached hereto, incorporated herein by 
this reference and made a part hereof (hereinafter collectively referred to 
as the "Premises");

    TOGETHER WITH all right, title and interest of Mortgagor in and to all of 
the following, whether now-owned or hereafter acquired (collectively, along 
with the Premises, hereinafter referred to as the "Mortgaged Property"):

         (i)       present and future structures, buildings, improvements, 
common areas, streets, lanes, sidewalks, alleys, passageways, passages, ways 
and public places, open or proposed, on or adjoining the Premises, 
rights-of-way, public or private, waters, watercourses, strips and gores of 
land, estates, liberties, privileges, interests, hereditaments and 
appurtenances whatsoever belonging to or in any way made appurtenant to the 
Premises; all easements and covenants now existing or hereafter created for 
the benefit of the Mortgagor or any subsequent owner or tenant of the 
Premises or over ground adjoining the Premises and all rights to enforce the 
maintenance thereof; all other rights, liberties and privileges of whatsoever 
kind or character including, without limitation, any rights in and to any 
land lying in the bed of any street, road or avenue, open or proposed, or in 
front of or adjoining the Premises; and all reversions and remainders, claims 
and demands whatsoever; the air space above and the right to use the air 
space above the Premises, and the drainage, crops, timber, agricultural, 
horticultural, mineral, water, oil and gas rights with respect thereto, at 
law or in equity;

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         (ii)      All now existing or hereinafter issued licenses, permits 
or agreements, with, from or of any and all governmental or other boards, 
bureaus, or instrumentalities, public utilities, agencies or departments 
relating to the Premises or any business conducted by Mortgagor thereon, or 
the use or occupancy of all or any part thereof ("Licenses and Permits");

         (iii)     All tools, parts, fixtures, appliances, machinery, and 
equipment of any nature whatsoever,  and other articles of personal property 
now or hereafter owned or acquired by Mortgagor which are now or at any time 
hereafter installed in, attached to or situated in or upon the Premises or 
in, on or in connection with any buildings and improvements now or hereafter 
erected thereon, or used or intended to be used in connection with the 
Premises or in the operation of any buildings and improvements now or 
hereafter erected thereon, or in the operation or maintenance of any such 
building and improvement situate thereon or any business of Mortgagor 
conducted thereon, whether or not the personal property is or shall be 
affixed thereto, including but not limited to all furniture, furnishings, 
apparatus, trade fixtures, inventory, goods, appliances, screens, storm and 
screen doors, awnings, window shades, venetian blinds, floor coverings, 
carpeting and other furnishings and other personal property of every kind and 
nature whatsoever; motors, elevators, escalators, fittings, radiators, gas 
ranges, ice boxes, compressors, mechanical refrigerators, couplings, 
communication equipment, computer facilities and equipment, storage tanks, 
drums and containers (including all rights of Mortgagor as lessee of any of 
the foregoing), plumbing, heating, lighting, cooking, laundry, ventilating, 
air conditioning, air cooling and refrigerating equipment and systems, 
furnaces, boilers, oil and gas burners, pipes, conduits, pipelines, engines, 
sprinkler and security equipment and systems, incinerating equipment and 
systems and fire fighting equipment and systems; and all renewals, 
replacements or articles in substitution of any of the foregoing, whether or 
not the same are or shall be attached to the Premises or any buildings or 
improvements thereon in any manner, and all accessories, parts or accessions 
thereto now or hereafter owned or acquired by Mortgagor or in which Mortgagor 
has or may acquire an interest, and all products and proceeds thereof;

         (iv)      All building materials, building machinery and on building 
equipment now or hereafter delivered on site to the Premises arising out of 
or in connection with the construction of or reconstruction of, or 
rehabilitation or remodeling to, any buildings or improvements now or 
hereafter located on the Premises;

         (v)       All right, title and interest of Mortgagor in and to all 
leases or subleases covering all or any part of the Premises and Mortgaged 
Property or any portion thereof now or hereafter existing or entered into, 
and all right, title and interest of Mortgagor thereunder including, without 
limitation, all present and future rents, receipts, issues, and/or profits, 
and all other existing and future accounts receivable or contract rights 
(including any right to payment, thereunder, whether or not earned by 
performance) of any nature arising out of the Premises and Mortgaged Property 
or from the sale or lease of any property, goods or materials or from the 
rendering of services including, but not limited to, the lease of all or a 
portion of the Premises or the operation of any income producing facility on 
the Premises (all of such proceeds, receipts and income are hereinafter 
collectively referred to as the "Income and Rents" and all such rights are 
hereinafter referred to individually as an "Account Receivable" and 
collectively as "Accounts Receivable") and any other income of any and all 

                                          3




kinds (including deposits) belong to or in any way pertaining to the Premises 
or any income producing facility now or hereafter on the Premises (including 
without limitation all Accounts and other amounts receivable in connection 
with any income producing facility now located on the Premises); all rights 
of payment, cash or security deposits, advance rentals, and deposits or 
payment of similar nature;

         (vi)      All right, title and interest of Mortgagor in and to all 
options to purchase or lease the Mortgaged Property or any portion thereof or 
interest therein, and any greater estate in the Premises owned or hereafter 
acquired by Mortgagor;

         (vii)     All awards and other compensation heretofore and hereafter 
to be made to Mortgagor for any taking by eminent domain, either permanent or 
temporary, of all or any part of the Premises or any easement or appurtenance 
thereof or thereto including, without limitation, special and consequential 
damages, which said awards and compensation are hereby assigned to Lender, 
and Mortgagor does hereby appoint Lender, and any of Lender's officers, its 
attorney-in-fact coupled with an interest and authority, and directs and 
empowers such attorney effective following an Event of Default, at the option 
of such attorney, on behalf of the Mortgagor, its successors and assigns, 
following consultation with Mortgagor to adjust or compromise the claim for 
any such award and to collect and receive the proceeds thereof;

         (viii)    All insurance policies covering the Premises and, 
following an Event of Default, all proceeds of any unearned premiums on any 
such insurance policies including, without limitation, the right to receive 
and apply the proceeds of any insurance, judgments, or settlements made in 
lieu thereof, for damage to the Mortgaged Property;

         (ix)      Any securities or guarantees held by Mortgagor with 
respect to any of the Accounts Receivable, Licenses and Permits and leases 
and subleases of the Premises, or any part thereof, and any notes, drafts, 
acceptances, chattel paper, documents or other instruments evidencing the 
same;

         (x)       The right, in the name and on behalf of itself or, 
following consultation with Mortgagor, the Mortgagor, to appear in or defend 
any action or proceeding brought with respect to the Premises (including, 
without limitation, any condemnation or arbitration proceedings), and to 
commence any action or proceeding to protect the interest of the Lender in 
and to the Mortgaged Property; and

         (xi)      All personal property of Mortgagor now or hereafter 
comprising or located in, on or about the Mortgaged Property or used or 
useful in any business now or hereafter conducted thereon, including without 
limitation, all goods, equipment, furniture, inventory, machinery, money, 
accounts, contracts, contract rights, notes, general intangibles, fixtures, 
instruments, documents and chattel paper, whether now owned or hereafter 
acquired, together with all replacements and substitutions therefor, and 
additions thereto and cash and non-cash proceeds (including insurance 
proceeds and proceeds of proceeds) thereof.

    TO HAVE AND TO HOLD the Mortgaged Property hereby conveyed or mentioned 
and intended so to be, unto Lender, its successors and assigns, to its own 
use, forever.

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    PROVIDED, ALWAYS, that this instrument is upon the express condition that 
if Mortgagor satisfies all of the Obligations, as hereinafter defined, in 
accordance with the provisions of the Financing Agreements, as hereinafter 
defined, and this Mortgage, at the times and in the manner specified, without 
deduction, fraud or delay, and if all the agreements, conditions, covenants, 
provisions and stipulations contained therein and in this Mortgage are fully 
performed and complied with, then this Mortgage and the estate hereby granted 
shall cease, determine and become void.  This Mortgage covers, among other 
things, all present and future advances made pursuant to this Mortgage and 
the Financing Agreements which future advances shall relate back to the date 
of this Mortgage.

    As used in this Mortgage, "Obligations" means any or all of the following 
indebtedness, liabilities and obligations of Mortgagor to Lender and any 
replacements or substitutions thereof:

    (a)  The existing and future debts, liabilities and obligations of 
Mortgagor to Lender including, without limitation, those evidenced by that 
certain Promissory Note of even date herewith in the original principal sum 
of Five Million ($5,000,000.00) Dollars executed and delivered by Mortgagor 
to Lender and all interest and costs due thereon, payable as provided 
therein, together with all amendments, extensions, renewals now or hereafter 
made thereto and any amounts which may be recharged or reloaned from time to 
time (all of which indebtedness shall be secured by this Mortgage with the 
lien priority hereof to the full extent permitted by Massachusetts law 
(hereinafter referred to as the "Note").

    (b)  The repayment of all sums now or hereafter advanced by Lender to or 
for the benefit of Mortgagor including, without limitation any overdrafts 
and/or overadvances now or hereafter made, together with applicable interest 
thereon;

    (c)  Any and all existing and future indebtedness, liabilities and 
obligations of Mortgagor to Lender whether incurred directly or indirectly or 
absolutely or contingently, including those of surety, endorser, guarantor, 
or otherwise, of any nature whatsoever and out of whatever transactions 
arising;

    (d)  Performance by Mortgagor hereunder, under the Note and in any other 
instruments, agreements and documents executed and/or delivered in connection 
herewith and therewith, and any other existing or future instruments, 
agreements or documents executed and/or delivered by and/or between Mortgagor 
and Lender as now or hereafter amended (collectively, along with the Note 
herein referred to as the "Financing Agreements");

    (e)  Performance by Mortgagor of all warranties, representations, 
covenants and agreements set forth in this Mortgage;

    (f)  The costs of curing any Event of Default set forth in this Mortgage 
or in the Financing Agreements which the Lender elects to cure; and

    (g)  The costs and expenses including, without limitation, reasonable 
attorneys' fees and disbursements, incurred by Lender in enforcing any of the 
Obligations.

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    MORTGAGOR REPRESENTS, COVENANTS AND WARRANTS to and with Lender that, 
until the Obligations secured hereby are fully performed and indefeasibly 
paid in full in cash:

    1.   Payment and Performance.  Mortgagor shall pay to Lender, in 
accordance with the terms of the Note, the Financing Agreements and this 
Mortgage, the principal, interest and other sums therein and herein set 
forth; shall perform and comply with all the agreements, conditions, 
covenants, provisions and stipulations of the Note, the Financing Agreements 
and this Mortgage; and Mortgagor shall timely perform all obligations and 
duties as landlord under any lease of all or any portion of the Mortgaged 
Property now or hereafter in effect.

    2.   Warranty of Title.  Mortgagor warrants that Mortgagor possesses good 
and marketable fee simple title to the Mortgaged Property, subject to no 
lien, charge or encumbrance of any nature except for those title exceptions 
listed in the mortgage title insurance policy approved by and issued to 
Lender insuring the priority of the lien of this Mortgage.  Mortgagor shall 
provide such title and all of its rights in and to the Mortgaged Property and 
shall preserve such title and all of its rights in and to the Mortgaged 
Property and shall forever warrant and defend the validity and priority of 
the lien hereof against the claims of all persons or entities whatsoever.  
Mortgagor further warrants that Mortgagor has all power and authority and 
capacity to mortgage the Mortgaged Property to Lender and to grant a lien on 
and security interest therein in the manner set forth herein.

    3.   Maintenance of Mortgaged Property.  Mortgagor shall keep and 
maintain or cause to be kept and maintained the Mortgaged Property including 
all buildings and improvements now or at any time hereafter erected on the 
Premises and the sidewalks and curbs abutting them, in good order and 
condition and in a rentable and tenantable state of repair, and will promptly 
make or cause to be made, as and when necessary, all repairs, renewals and 
replacements, structural and nonstructural, exterior and interior, ordinary 
and extraordinary, foreseen and unforeseen. Mortgagor shall abstain from and 
shall not permit the commission of waste in or about the Mortgaged Property; 
shall not cause or permit any building or improvement upon the Premises to be 
removed or demolished or structurally altered without the prior written 
consent of Lender; and shall not permit the Mortgaged Property to become 
deserted or abandoned.

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    4.   Insurance.

         (a)  Mortgagor shall keep the Mortgaged Property continuously 
insured to the extent of its full insurable value, but in any event not less 
than that amount to which any co-insurance provisions would apply, and not 
less than the full replacement amount of the building and any improvements 
thereon, against loss or damage by fire, with extended coverage and coverage 
against loss or damage by theft, vandalism, malicious mischief, sprinkler 
leakage, earthquake, boiler, machinery and flood, unless Mortgagor can 
demonstrate the property is located outside a flood hazard area, and against 
other hazards as Lender may reasonably require from time to time.  Mortgagor 
shall keep the Boiler and Machinery insurance coverage with a limit equal to 
the greater of $1,000,000.00 or twenty-five percent (25 percent) of the one 
hundred percent (100 percent) replacement cost of the building and any 
improvements unless Mortgagor can demonstrate that the property policy 
carries coverage for a steam boiler explosion in which case Mortgagor must 
carry coverage in the amount of the value of the steam objects. Mortgagor 
shall also maintain comprehensive general liability insurance (including 
products and completed operations and personal injury and property damage, 
rental loss and workmen's compensation insurance in such total amounts as 
Lender may reasonably require from time to time.  In connection with any 
construction, remodeling, and rehabilitation work now or hereafter on the 
Mortgaged Property, Mortgagor shall keep applicable insurance in effect.

         (b)  All original policies, including policies for any amounts 
carried in excess of the required minimum and policies not specifically 
required by Lender, shall be in form and content satisfactory to Lender, 
shall be issued by companies satisfactory to Lender, shall at all times be 
maintained in full force and effect, shall be assigned to Lender, with 
premiums prepaid, as additional collateral security for payment of the 
Obligations, shall be endorsed with a standard mortgagee, loss payee or 
additional insured clause, as applicable, in favor of Lender, shall not be 
subject to contribution, and shall provide for at least sixty (60) days' 
notice to Lender of cancellation or modification in coverage, and shall 
insure Lender notwithstanding any act or negligence on the part of Mortgagor. 
 Mortgagor shall provide Lender with at least twenty (20) days' notice for 
non-payment of any insurance premium.  At least sixty (60) days prior to the 
expiration date of any insurance policy Mortgagor shall deliver to Lender 
satisfactory evidence of the renewal of all such insurance.  In the event 
Mortgagor employees a property management company, said property management 
company shall be named as an additional insured.

         (c)  If the insurance, or any part thereof, shall expire, be 
canceled, become void or voidable by reason of Mortgagor's breach of any 
condition thereof, or if for any reason whatever the insurance shall be 
unsatisfactory to Lender, Mortgagor shall within five (5) days of Lender's 
notice to Mortgagor, place new insurance on the Mortgaged Property reasonably 
satisfactory to Lender.

         (d)  In the event of loss, Mortgagor will give immediate notice 
thereof to Lender, and Lender may make proof or proofs of loss on behalf of 
Mortgagor and any adjustment of a proof of loss shall require the prior 
written consent of Lender.  Each insurance company concerned is hereby 
authorized and directed to make payment under such insurance, including, 
following an occurrence of an Event of Default, and return unearned 

                                    7



premiums, directly to Lender instead of to Mortgagor and Lender jointly, and 
Mortgagor hereby appoints Lender, irrevocably, as Mortgagor's 
attorney-in-fact to endorse any draft therefor. After June 26, 2002, Lender 
shall have the right in its sole and absolute discretion to retain and apply 
the proceeds of any such insurance, at its election, to reduction of the 
Obligations, or to restoration or repair of the property damaged.  Prior to 
June 26, 2002, and provided that:  (1) Mortgagor shall not be in default 
under this Mortgage or the Financing Agreements, and (2) the insurance 
proceeds are sufficient to restore the damaged property, Lender shall apply 
the proceeds of such insurance to the restoration or repair of the property 
damaged.  Such policies of insurance and all renewals thereof are hereby 
assigned to Lender as additional security for payment of the Obligations and 
Mortgagor hereby agrees that any values available thereunder upon 
cancellation or termination of any of said policies or renewals, whether in 
the form of return of premiums or otherwise, shall be payable to Lender as 
assignee thereof.  If Lender becomes the owner of the Mortgaged Property or 
any part thereof by foreclosure or otherwise, such policies, including all 
right, title and interest of Mortgagor thereunder, shall become the absolute 
property of Lender.

    5.   Taxes and Other Charges.

         (a)  Mortgagor shall pay or cause to be paid when due and payable 
and before interest or penalties are due thereon, without any deduction, 
defalcation or abatement, all taxes of any kind whatsoever (including all 
personal property, income, franchise, profits, sales, use, income, gross 
receipts, withholding taxes and any payments in lieu of real estate taxes), 
general and special assessments, water and sewer rents, levies, encumbrances, 
permits, license and inspection fees, and all other charges or claims of 
every nature and kind which may be assessed, levied, imposed, suffered, 
placed or filed at any time against Mortgagor or the Mortgaged Property or 
against the interests of Lender in the Mortgaged Property, (except, Mortgagor 
shall not be responsible for any assessments made against or due from the 
Mortgagee in the nature of income, franchise, profits or other taxes which 
are attributable to the Mortgagee solely due to its status as a mortgagee) 
which by any present or future law may have priority over the Obligations 
either in lien or in distribution out of the proceeds of any judicial sale; 
and Mortgagor shall produce to Lender, not later than such dates, copies of 
receipts (or other evidence) for the payment thereof.

         (b)  Upon an Event of Default or failure to pay annual premiums for 
insurance, the Lender may require that, on the first day of every month, an 
amount equal to 1/12 of the annual premiums for such fire and extended 
coverage insurance, as required by Lender, and such annual real estate taxes 
or payments to be made in lieu of taxes which may be assessed, levied, or 
imposed.   Without limiting the foregoing, the Lender, upon an Event of 
Default may require Mortgagor to pay to Lender an amount equal to 1/12 of the 
annual amount due for water rents, sewer rents, special assessments, and any 
other tax, assessment, claim, lien or encumbrance which may at any time be or 
become a lien upon the Mortgaged Property prior to the lien of this Mortgage, 
and on demand from time to time shall pay to Lender all additional sums as 
Lender in its discretion may deem necessary to pay such premiums and other 
payments, the amounts so paid to be security for such premiums and other 
payments and to be used in payments thereof. No amount so paid shall be 
deemed to be trust funds but may be commingled with general funds of Lender, 
and no interest shall be payable thereon.  If, pursuant to any provision of 
this Mortgage, the whole amount of

                                          8





the Obligations becomes due and payable, Lender shall have the right at its 
election to apply any amounts so held against the entire indebtedness secured 
hereby.

    6.   Compliance with Law and Regulations.  Mortgagor shall comply with 
all laws, ordinances, regulations and orders now or hereafter in effect of 
all federal, state, municipal and other governmental authorities relating to 
the Mortgaged Property.

    7.   Inspection.  Lender and any persons authorized by Lender shall have 
the right at any time and from time to time, upon reasonable notice to 
Mortgage to enter the Premises to inspect and photograph its condition and 
state of repair and the Mortgaged Property and the records of Mortgagor with 
respect thereto.

    8.   Declaration of No Set-Off.  Within one (1) week after requested to 
do so by Lender, Mortgagor shall certify to Lender or to any assignee or 
proposed assignee of this Mortgage, in writing duly acknowledged, the amount 
of principal, interest and other charges then owing on the Obligations and on 
any obligations secured by prior liens upon the Mortgaged Property, if any, 
and whether there are any set-offs or defenses against them.

    9.   Security Agreement.  This Mortgage constitutes a security agreement 
under the Uniform Commercial Code and Mortgagor hereby grants Lender a lien 
on and a security interest in all personal property of Mortgagor now or 
hereafter comprising or located in, on or about the Mortgaged Property or 
used or useful in any business now or hereafter conducted thereon, including 
without limitation, all goods, equipment, furniture, inventory, machinery, 
money, accounts, contracts, contract rights, notes, general intangibles, 
fixtures, instruments, documents and chattel paper, whether now owned or 
hereafter acquired, together with all replacements and substitutions 
therefor, and additions thereto and cash and non-cash proceeds (including 
insurance proceeds and proceeds of proceeds) thereof.  Mortgagor shall 
execute, deliver, file and refile any financing statement, continuation 
statements, or other security agreements Lender may require from time to time 
to confirm the lien of this Mortgage with respect to such property.  Without 
limiting the foregoing, after an event of default hereunder, Mortgagor hereby 
irrevocably appoints Lender attorney-in-fact for Mortgagor to execute, 
deliver and file such instruments for and on behalf of Mortgagor.  Mortgage 
shall not change its chief executive office without giving Lender at least 
sixty (60) days prior written notice thereof, which notice shall be 
accompanied by new financing statements executed by Mortgagor in the same 
form as the financing statements delivered to Lender on the date hereof 
except for the change of address.  Upon any default or Event of Default 
hereunder or under any of the Financing Agreements, Lender shall have, in 
addition to any other rights and remedies hereunder or under said Financing 
Agreements, all of the rights and remedies granted a secured party under the 
Uniform Commercial Code with respect to all personal property.  
Notwithstanding any release of any or all of the property included in the 
Mortgaged Property which is deemed "real property", any proceedings to 
foreclose this Mortgage or its satisfaction of record, the terms hereof shall 
survive as a security agreement with respect to the security interest created 
hereby and referred to above until the indefeasible repayment or satisfaction 
in full in cash of the Obligations of Mortgagor.

    10.  Financial Statements.

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         Mortgagor shall submit to Lender, the following statements relating 
to Borrower in a format which includes comparisons with the prior 
corresponding time period:  (i) within 60 days after the end of each 
quarterly fiscal period, quarterly balance sheets and income statements 
certified as to correctness by Borrower's chief financial officer, and (ii) 
within 120 days after the end of Borrower's fiscal year, annual balance 
sheets, profit and loss statements, income statements, reconciliations of 
capital accounts, statements of changes in financial position and, when 
required by the Lender, a statement itemizing fixed asset acquisition and 
disposition, and an aging of Borrower's accounts payable and receivable, all 
of which shall be certified as to correctness by Borrower's chief financial 
officer for the fiscal year, without restriction as to scope. With each 
submission of financial statements as required under (i) and (ii) the Lender 
shall also certify that there are no Defaults existing under the Loan 
Documents.  In addition, Mortgagor shall furnish to Lender such data and 
information (financial and otherwise) as may be required pursuant to the 
terms and conditions of the Financing Agreements.

    11.  Required Notices.  Mortgagor shall notify Lender promptly of the 
occurrence of any of the following:

         (a)  a fire or other material casualty causing damage to all or any 
part of the Mortgaged Property;

         (b)  receipt of notice of eminent domain proceedings or condemnation 
of all or any part of the Mortgaged Property;

         (c)  receipt of any notice of violation, cancellation, expiration or 
non-renewal from any governmental authority relating to the structure, use or 
occupancy of the Mortgaged Property;

         (d)  receipt of any notice from any tenant of all or any portion of 
the Mortgaged Property or any lessee of any of the Mortgaged Property 
relating to occupancy or the payment of rent or any breach of a lease for the 
Mortgaged Property;

         (e)  a change in the occupancy of the Mortgaged Property; or

         (f)  commencement of any material (i.e., more than $25,000 in 
damages) litigation affecting the Mortgaged Property.

    12.  Condemnation.

         (a)  In the event of any condemnation or taking of any part of the 
Mortgaged Property by eminent domain, alteration of the grade of any street, 
or other injury to or decrease in the value of the Mortgaged Property by any 
public or quasi-public authority or corporation, exercising the power of 
eminent domain or otherwise, all proceeds (that is, the award or agreed 
compensation for the damages sustained) allocable to Mortgagor, after 
deducting therefrom all costs and expenses (regardless of the particular 
nature thereof and whether incurred with or without suit) including 
attorney's fees incurred by Lender in connection with the collection of such 
proceeds, shall be paid over to Lender and applied first

                                          10




to payment of the Obligations.  No settlement for damages sustained shall be 
made by Mortgagor without Lender's prior written approval, which approval 
shall not be unreasonably withheld.  Receipt by Lender of any proceeds less 
than the full amount of the then outstanding balance of the Obligations shall 
not alter or modify Mortgagor's obligations for the installments of 
principal, interest and other charges specified in the Note and the Financing 
Agreements. All proceeds so paid to or received by Lender shall be applied in 
the order and in the amounts that Lender, in Lender's sole discretion, may 
elect, to the payment of principal (whether or not then due and payable), 
interest, any sums secured by this Mortgage, or toward payment, after the 
aforesaid deductions, to Mortgagor, on such terms as Lender may specify, to 
be used for the sole purpose of altering, restoring or rebuilding any part of 
the Mortgaged Property which may have been altered, damaged or destroyed as a 
result of the taking, alteration of grade or other injury to the Mortgaged 
Property.

         (b)  If prior to the receipt of the proceeds by Lender the Mortgaged 
Property shall have been sold on foreclosure of this Mortgage, Lender shall 
have the right to receive the proceeds to the extent of:

                   (i)       the full amount of all such proceeds if Lender 
is the successful purchaser at the foreclosure sale; or

                   (ii)      if anyone other than Lender is the successful 
purchaser at the foreclosure sale, any deficiency (as hereinafter defined) 
due to Lender in connection with the foreclosure sale, with interest thereon 
at the highest rate then payable on the Note, and reasonable counsel fees, 
costs and disbursements incurred by Lender in connection with collection of 
such proceeds of foreclosure sale and the establishment of such deficiency.  
For purposes of this subparagraph, the word "deficiency" shall be deemed to 
mean the difference between (A) the net sale proceeds actually received by 
Lender as a result of such foreclosure sale less any costs and expenses 
(including attorneys' fees) incurred by Lender in connection with enforcement 
of its rights under the Note, the Financing Agreements and this Mortgage and 
(B) the aggregate amount of all sums which Lender is entitled to collect 
under the Note, the Financing Agreements and this Mortgage.

         (c)  Lender shall have the right to prosecute to final determination 
or settlement an appeal or other appropriate proceedings in the name of 
Lender or Mortgagor, for which Lender is hereby appointed irrevocably as 
attorney-in-fact for Mortgagor, which appointment, being for security, is 
irrevocable.  In such event, the expenses of the proceedings, including 
reasonable counsel fees, shall be paid first out of the proceeds, and only 
the excess, if any, paid to Lender shall be credited against the amounts due 
under the Mortgage.

    (d)  Nothing herein shall limit the rights otherwise available to Lender, 
at law or in equity, including the right to intervene as a party to any 
condemnation proceeding.

    13.  Mortgages and Liens.

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         (a)  Without the prior written consent of Lender,  Mortgagor will 
not voluntarily create or permit to be created or filed against the Premises, 
any mortgage lien or other lien or security interest inferior or superior to 
the lien of this Mortgage.

         (b)  Mortgagor will keep and maintain the Mortgaged Property free 
from the claims of all persons erecting, altering, repairing buildings, 
structure or other improvements to the real estate or for furnishing material 
or rental equipment, appliances or tools in connection with the construction, 
reconstruction, rehabilitation or alteration of any or all buildings and 
improvements which are now or hereafter may be erected upon the Mortgaged 
Property, notwithstanding by whom such labor or materials may have been 
contracted except as may be expressly permitted pursuant to M.G.L. Ch. 254, 
- -Section Symbol-2. Lender reserves the right to refuse to advance additional 
funds upon the recording of a Notice of Contract or other lien other than 
Pursuant to M.G.L. Ch. 254, -Section Symbol-2.

         (c)  Mortgagor will pay promptly all requisitions for payment 
submitted by Mortgagor's general contractor(s), but if said general 
contractor has filed a Notice of Intent in no event shall any such payment be 
made later than twenty-five (25) days after the last day of the period stated 
in the General Contractors' only executed partial waiver and subordination of 
lien.

    14.  Leases.

         (a)  Mortgagor hereby represents that there are no leases, subleases 
or agreements to lease all or any part of Mortgaged Property now in effect 
except as set forth on Exhibit "B" hereto incorporated herein by this 
reference and made a part hereof.  Mortgagor agrees not to enter into any 
leases or agreements to lease all or any part of the Mortgaged Property 
without the prior written consent of Lender.

         (b)  Mortgagor hereby assigns to Lender and grants Lender a lien on 
and security interest in and to all present and future leases and all of 
Mortgagor's right to receive payments under any existing and future leases of 
the Mortgaged Property or any portion thereof including the rents, receipts, 
issues, profits and other income of any and all kinds (including deposits) 
received or receivable by Mortgagor due or to become due from the sale or 
lease of any property, goods or materials or from the rendering of services 
of any nature including, without limitation the occupancy, license, rental or 
lease of any part of the Mortgaged Property or the operation of any income 
facility on Mortgaged Property, as further security for the payment of the 
Obligations. Mortgagor grants to Lender the right to enter upon and take 
possession of the Mortgaged Property for the purpose of collecting the same 
and to let or relet the Mortgaged Property or any part thereof, and to apply 
the rents, issues, receipts, profits and other income of any and all kinds 
(including deposits) or any other amounts received or receivable by 
Mortgagor, due or to become due from the sale or lease of any property, goods 
or materials or from the rendering of services of any nature including, 
without limitation, the occupancy, license, rental or lease of any part of 
the Mortgaged Property or the operation of any income facility on the 
Mortgaged Property, or after payment of all necessary charges and expenses, 
on account of the Obligations.  This assignment and grant shall continue in 
effect until all the Obligations are paid and performed in full.  
Notwithstanding the foregoing, so long as no Event of Default has occurred, 
Mortgagor is 

                                          12




authorized to collect and receive said rents, receipts, issues, profits and 
other income which authorization shall cease immediately upon the occurrence 
of the Event of Default.  Mortgagor agrees to use such rents, receipts, 
issues, profits and other income in payment of the Obligations and in payment 
of taxes, assessments, sewer and water rents, and carrying charges coming due 
against the Mortgaged Property.  Even prior to the occurrence of an Event of 
Default, Mortgagor will not, without the written consent of the Lender, 
receive or collect rent or other amounts from any tenant of the Mortgaged 
Property or any part thereof for a period of more than one month in advance.

    15.  Modification of Mortgage.  Lender may, at any time and from time to 
time: renew or extend this Mortgage; waive any of the terms, covenants or 
conditions hereof, of the Note, or of the Financing Agreements; in whole or 
in part; release any portion of the Mortgaged Property or any other security; 
release, substitute or add any other party liable hereunder or under the 
Note, or the Financing Agreements, and grant such extensions and indulgences 
in relation to the Obligations secured hereby as Lender may determine, all 
without the consent of Mortgagor and without any obligation to give notice of 
any kind thereto to Mortgagor or others and without, in any manner, affecting 
the liabilities and obligations of Mortgagor on the Obligations, and the 
priority of the lien hereof on all or any part of the Mortgaged Property.

    16.  No Transfer.  Without the prior written consent of Lender, Mortgagor 
will abstain from and will not cause or permit, to the extent it may do so, 
any transfer of legal or equitable title to, beneficial interest in, or any 
estate or interest in the Mortgaged Property or any part thereof, or of other 
interests in the Mortgaged Property, voluntarily or by operation of law 
(other than by death or by execution or foreclosure under this Mortgage or by 
exercise of the power of eminent domain), whether by sale, exchange, lease, 
conveyance, merger, consolidation or the granting of any lien or security 
interest or otherwise, or any agreement to do any of the foregoing.  In the 
event that an attempt to do or consent to any of the foregoing with respect 
to all or any portion of the Mortgaged Property occurs, the Obligations shall 
immediately become due and payable.

    17.  Lender's Right to Remedy Defaults.  Mortgagor shall pay or cause to 
be paid, from time to time as and when the same shall become due, all claims 
and demands of any persons or entities which, if unpaid, might result in or 
permit the creation of a lien on the Mortgaged Property or any part thereof, 
and shall do or cause to be done any and all things which may be necessary so 
that the lien of this Mortgage shall be fully preserved and so that there 
shall not be created, permitted or suffered to exist any lien, encumbrance or 
charge affecting the Mortgaged Property other than those approved in writing 
by Lender, all at the sole cost of Mortgagor.  If Mortgagor should fail to 
pay real estate or other taxes, assessments, water and sewer rents, charges 
and claims, sums due under any prior lien, or insurance premiums, or fail to 
make necessary repairs, or permit waste, or fail to cure any default under 
any prior lien, Lender, at its election, on such notice to Mortgagor as may 
be reasonable under then-extent circumstances, shall have the right but not 
the obligation to make any payment or expenditure and to take any act, which 
Mortgagor should have made or taken, or which Lender deems necessary or 
advisable to protect the security of this Mortgage and the Mortgaged 
Property, without prejudice to any of Lender's rights or remedies available 
hereunder or otherwise, at law or in equity.  All such sums, as well as 
costs, advanced by 

                                          13





Lender pursuant to this Mortgage shall be due immediately from Mortgagor to 
Lender, shall be added to the Obligations secured hereby and the lien 
therefor shall relate back to the date of this Mortgage, and shall bear 
interest at a rate which shall be twelve percent (12 percent) per annum from 
the date of payment by Lender until the date of repayment. Mortgagor shall be 
given fifteen (15) days notice that said default rate is in effect and shall 
thereafter have the right to cure promptly the default.

    18.  Environmental Representations Warranties and Covenants.

         (a)  Compliance with Law.

                   (i)       To the best of Mortgagor's knowledge (after due 
inquiry and investigation), Mortgagor represents and warrants that there is 
no activity at the Premises which has been conducted by Mortgagor or any 
predecessor-in-interest to Mortgagor, or is being conducted, except in 
compliance with (or which has been remediated in accordance with) all 
statutes, ordinances, regulations, orders and requirements of common law 
concerning (A) those activities, (B) repairs or construction of any 
improvements, (C) handling of any materials, (D) discharges to the air, soil, 
surface water or ground water and (E) storage, treatment or disposal of any 
waste at or connected with any activity at the Premises ("Environmental 
Statutes"). 

                   (ii)      Mortgagor shall cause all activities at the 
Premises to be conducted in compliance with all Environmental Statutes. 
Mortgagor shall cause all permits, licenses or approvals to be obtained, and 
shall cause all notifications to be made, as required by Environmental 
Statutes. Mortgagor shall, at all times, cause compliance with the terms and 
conditions of any such approvals or notifications.

                   (iii)     Mortgagor shall, upon receipt thereof, provide 
to Lender copies of:

                             (A)  applications or other materials submitted to
         any governmental agency in compliance with Environmental Statutes;

                             (B)  any notifications submitted to any person
         pursuant to Environmental Statutes;

                             (C)  any permit, license, approval, amendment or
         modification thereto granted pursuant to Environmental Statutes;

                             (D)  any record or manifest required to be
         maintained pursuant to Environmental Statutes; and

                             (E)  any correspondence, notice of violation,
         summons, order, complaint or other document received by Mortgagor, its
         lessees, sublessees or assigns, pertaining to compliance with any
         Environmental Statutes.

                                          14





         (b)  Site Contamination.

                   (i)       To the best of Mortgagor's knowledge (after due 
inquiry and investigation), except as disclosed in writing to Lender 
concurrently herewith, Mortgagor represents and warrants the absence of 
contamination on or in the Mortgaged Property. Mortgagor shall not permit 
contamination of Mortgaged Property by hazardous substances. Mortgagor shall, 
at all times cause hazardous substances to be handled on the Premises in a 
manner which will not cause an undue risk of contamination of the Mortgaged 
Property.

                   (ii)      For purposes of this section, the term 
"contamination" shall mean the uncontained presence of hazardous substances 
at the Premises, or arising from the Premises, which may require remediation 
under any applicable law.

                   (iii)     For purposes of this section, "hazardous 
substances" shall mean "hazardous substances" as defined pursuant to the 
Comprehensive Environmental Response, Compensation and Liability Act, 42 
U.S.C. Sections  9601-9657, as amended by the Superfund Amendments and 
Reauthorization Act of 1986, Pub. L. No. 99-499, 100 State. 1613 (Oct. 17, 
1986), "regulated substances" within the meaning of subtitle I of the 
Resource Conservation and Recovery Act, 42 U.S.C. Sections  6991-6991i, as 
amended by the Superfund Amendments and Reauthorization Act of 1986, Pub. L. 
No. 99-499, 100 Stat. 1613 (Oct. 17, 1986).

         (c)  Other Hazardous or Toxic Materials.

              To the best of Mortgagor's knowledge (after due inquiry and 
investigation), Mortgagor represents and warrants that there are no:

                   (i)       polychlorinated biphenyls or substances 
containing polychlorinated biphenyls present on or in the Premises in 
concentrations in excess of legal limits;

                   (ii)      asbestos or materials containing asbestos 
present on or in the Premises; or

                   (iii)     urea formaldehyde foam insulation on or in the 
Premises.

         (d)  Environmentally Sensitive Areas.

              To the best of Mortgagor's knowledge (after due  inquiry and 
investigation), Mortgagor represents and warrants that no portion of the 
Premises constitutes any of the following "Environmentally Sensitive Areas":

                   (i)       a wetland or other "water of the United States" 
for purposes of Section 404 of the federal Clean Water Act, 33 U.S.C. Section 
1344, or any similar area regulated under any state law;

                                          15





                   (ii)      a portion of the coastal zone for purposes of 
the federal Coastal Zone Management Act, 16 U.S.C. Sections  1451-1464; or

                   (iii)     any other area, development of which is 
specifically restricted under applicable law by reason of its physical 
characteristics or prior use.

         (e)  Radon.

                   (i)       To the best of Mortgagor's knowledge (after due 
inquiry and investigation), Mortgagor represents and warrants that there is 
no investigation of the Premises being conducted for the presence of radon 
gas or the presence of the radioactive decay products of radon.

                   (ii)      Mortgagor shall cause all construction of new 
structures on the Premises to use design features which safeguard against or 
mitigate the accumulation of radon or radon-products in concentrations 
exceeding an acceptable level in any such new structure.  At the earliest 
feasible time during or after construction of any new structure on the 
Premises, Mortgagor shall commission an investigation of such new structure 
for the presence of radon or radon-products and shall provide a report of 
such investigation to Lender.

                   (iii)     For purposes of this paragraph, "acceptable 
level" shall mean the lowest applicable maximum concentration established by 
any governmental agency with jurisdiction over the Premises.  In the absence 
of a legally binding maximum concentration, the "acceptable level" shall be 
an air concentration of 4 picocuries/liter.

         (f)   Tanks.

                   (i)       To the best of Mortgagor's knowledge (after due 
inquiry and investigation), Mortgagor represents and warrants that there are 
no tanks presently or formerly used for the storage of any liquid or gas 
above or below ground present on the Premises except as disclosed in writing 
to the Lender.

                   (ii)      Mortgagor shall neither install nor permit to be 
installed any temporary or permanent tanks for the storage of any liquid or 
gas above or below ground except as in compliance with the other provisions 
of this section and after obtaining written permission to do so from Lender.

    19.  Environmental Investigations.

         (a)  Lender may at any time and from time to time, at its 
discretion, commission investigations at Mortgagor's expense of (i) 
compliance at the Premises with Environmental Statutes, (ii) the presence of 
hazardous substances or contamination in the Mortgaged Property, (iii) the 
presence in the Mortgaged Property of materials which are the subject of 
Paragraph 18(c), (iv) the presence at the Premises of Environmentally 
Sensitive Areas which are the subject of Paragraph 18(d), (v) the presence at 
the Premises of radon-products, or (vi) the presence on the Premises of tanks 
which are the subject of Paragraph 18(f).

                                          16





         (b)  In connection with any investigation pursuant to Subparagraph 
(a) of this Paragraph 19, Mortgagor, its lessees, sublessees and assigns, 
shall comply with any reasonable request for information made by Lender or 
its agents in connection with any such investigation. Mortgagor represents 
and warrants that any response to any such request for information will be 
full and complete.

         (c)  Mortgagor will assist Lender and its agents in obtaining any 
records pertaining to the Mortgaged Property or to Mortgagor and the lessees, 
sublessees or assigns of Mortgagor in connection with an investigation 
pursuant to Subparagraph (a) of this Paragraph 19.

         (d)  Mortgagor will accord Lender and its agents access to all areas 
of the Mortgaged Property at reasonable times and in reasonable manners in 
connection with any investigation pursuant to Subparagraph (a) of this 
Paragraph 19.

         (e)  No investigation commissioned pursuant to this paragraph shall 
have any effect upon the representations or warranties made by Mortgagor to 
Lender in this Mortgage.

    20.  Indemnification.  Mortgagor hereby agrees to indemnify and to hold 
harmless Lender of, from and against any and all expenses, loss or liability 
suffered by Lender by reason of Mortgagor's breach of any of the provisions 
of this Mortgage including, without limitation:

         (a)  Any and all expenses that Lender may incur in complying with 
any Environmental Statutes;

         (b)  Any and all costs that Lender may incur in studying or 
remedying any contamination of the Mortgaged Property;

         (c)  Any and all fines, penalties or other sanctions (including a 
voiding of any transfer of the Mortgaged Property) resulting from the failure 
of Mortgagor to have complied with Environmental Statutes; and

         (d)  Any and all legal and professional fees and costs incurred by 
Lender in connection with the foregoing.  This indemnification shall survive 
payment of the Note and shall be in addition to, and not in limitation of, 
that certain Hazardous Materials Indemnification Agreement of even date from 
the Mortgagor to the Lender. 

    21.  Events of Default.  Any one or more of the following events shall 
constitute an Event of Default hereunder:

         (a)  Failure of Mortgagor to make, within ten (10) days of the date 
when due, any payment of principal interest or premium under the Note or 
failure by the Mortgagor to pay within fifteen (15) business days of the date 
due or demanded, any other sum in accordance with the terms of the Note or 
the other Financing Agreements;

                                          17





         (b)  Mortgagor's nonperformance of or noncompliance in any material 
respect with any other agreements, conditions, covenants, provisions or 
stipulations contained in the Note or the Financing Agreements, not cured 
after any applicable notices and within applicable grace periods, if any, or 
Mortgagor's nonperformance or noncompliance with any of the agreements, 
conditions, covenants, provisions or stipulations contained in this Mortgage 
or any other agreement between Mortgagor and Lender not cured within fifteen 
(15) days after the earlier of the date Mortgagor should have notified Lender 
thereof as  set forth hereunder or Lender's written notice thereof;

         (c)  Any signature, statement, representation or warranty made in 
the Note, the Financing Agreements or this Mortgage, or in any financial 
statement, certificate, application, request or other document furnished to 
Lender by Mortgagor at any time prior to, now or hereafter, is not true and 
correct in any material respect when made or delivered;

         (d)  The occurrence of any Event of Default under any of the 
Financing Agreements; or

         (e)  The transfer or sale (except in the ordinary course of 
business) of any part of the Mortgaged Property or any interest therein, 
including, without limitation, the acts of transfer described in Paragraph 16 
above, without the Lender's prior written consent.

    22.  Remedies of Lender.

         (a)  Upon the happening of any Event of Default, the entire unpaid 
balance of the Obligations, including interest as has accrued thereon, and 
all other sums secured by this Mortgage shall become immediately due and 
payable, at the option of Lender, without notice to or demand upon Mortgagor 
or any other person.

         (b)  When the Obligations shall become due and payable, either 
because of maturity or because of acceleration upon the occurrence of any 
Event of Default, or otherwise, then forthwith in addition to all other 
rights or remedies available under the Financing Agreements, at law or in 
equity:

                   (i)       Foreclosure. Lender may institute an action to 
foreclose upon this Mortgage by issuance of a complaint, or may take such 
other action at law or in equity for the enforcement of this Mortgage and 
realization on the mortgage security or any other security herein or 
elsewhere provided for, as the law may allow, and may proceed therein to 
final judgment, execution and sale for the collection of the entire unpaid 
balance of the Obligations, with interest thereon at the then applicable rate 
stipulated in the Note to the date of default, and thereafter until payment 
in full is received by Lender at a rate which shall be twelve percent (12%) 
per annum, which Obligations shall include all other sums due from Mortgagor 
to Lender in accordance with the provisions of the Note, the Financing 
Agreements and this Mortgage, including all sums which may have been advanced 
by Lender to Mortgagor after the date of this Mortgage, and all sums which 
may have been advanced by Lender for taxes, water or sewer rents, charges or 
claims, payments on prior liens, insurance or repairs to the Premises, all 
costs of suit, and together with Lender's reasonable attorney's collection 
fee; and

                                          18





                   (ii)      Possession.  Lender may peaceably and quietly 
enter upon, have, hold, use, occupy, possess, rent and otherwise enjoy the 
Mortgaged Property, with or without legal action and by force if necessary; 
collect therefrom all rents, issues and profits thereof (which term shall 
also include sums payable for use and occupation (of other than Mortgagor) 
and whether or not Lender takes possession of the Mortgaged Property) and, 
after deducting all costs of collection and administration, apply the net 
rentals, issues and profits to any or all of the following in such order and 
amounts as Lender, in Lender's sole discretion, may elect: the payment of any 
sums due under any prior lien(s), taxes, water and sewer rents, charges, 
collection fees and expenses, and to the maintenance, repair or restoration 
of the Mortgaged Property; and on account of and in reduction of the 
Obligations hereby secured. Lender shall be liable to account only for rents, 
profits, royalties and other amounts actually received by Lender. In and for 
that purpose Mortgagor hereby assigns to Lender all rentals, profits, 
royalties and other amounts receivable due and to become due under any lease 
or leases, or license or licenses, or rights to use and occupy the Mortgaged 
Property now existing or hereafter created, as well as all rights and 
remedies provided in such lease or leases or license or licenses or at law or 
in equity for the collection of rentals and royalties.  Lender shall have the 
absolute right to the appointment of a receiver for the rents, issues and 
profits of the Mortgaged Property with power to take possession of the 
Mortgaged Property including possession from the Mortgagor, if in possession 
of and occupying any portion of the Mortgaged Property, and power to lease 
and repair the Mortgaged Property and such other power as may be deemed 
necessary, without any consideration of and for the value of the Mortgaged 
Property, or its depreciation in value from any cause whatsoever, or the 
solvency of Mortgagor or of any person or persons liable for on the payment 
of the Note or other sums due hereunder or thereunder or any default under 
the terms of the Note, the Financing Agreements or this Mortgage.

         (c)  Lender shall have the right, at any time and from time to time, 
to bring an appropriate action to recover any sums required to be paid by 
Mortgagor under the terms of this Mortgage, as the same shall become due, 
without regard to whether or not any other sums secured by this Mortgage 
shall then be due, and without prejudice to the right of Lender thereafter to 
bring an action to foreclose on this Mortgage, or any other action for any 
other default by Mortgagor existing at the time the earlier action was 
commenced.

         (d)  Upon the occurrence of an Event of Default (or, in the case of 
an emergency threatening the Mortgaged Property or Lender's rights therein, 
the occurrence of an event which if uncured will constitute an Event of 
Default with the passage of time), Lender may (but is not obligated to) pay 
any sum or perform any other obligation for the account of Mortgagor which 
Mortgagor has failed to pay or perform, and sums so spent by Lender shall be 
added to the principal sum secured by this Mortgage and be repayable by 
Mortgagor on demand, and shall bear interest from the date of advance by 
Lender at a rate which shall be twelve percent (12 percent) per annum until 
paid.

         (e)  Any real estate sold hereunder or under the Financing 
Agreements or other judicial proceedings may be sold in one parcel as an 
entity or in such parcels and in such order and manner as Lender, in its sole 
discretion may elect.

                                          19





         (f)  All deposits held in connection with the rental, lease, license 
or use of space or other facilities on the Mortgaged Property at the time of 
the occurrence of such Event of Default, all interest of Mortgagor in all 
premiums for, or dividends upon, any insurance for the Mortgaged Property, 
and all refunds or rebates of taxes and assessments upon the Mortgaged 
Property, are hereby assigned to Lender as further security for the payment 
of the Obligations during the continuance of any such Event of Default.

    This Mortgage is upon the STATUTORY CONDITION, for any breach of which 
constituting an Event of Default the Lender shall have the STATUTORY POWER OF 
SALE, and any other remedies provided by applicable law including, without 
limitation, the right to pursue a judicial sale of all right, title and 
interest of the Mortgagor in the Mortgaged Property or any portion thereof by 
deed, assignment, or otherwise.  The Mortgagor agrees and acknowledges that 
the acceptance by the Lender of any payments from the Mortgagor after the 
occurrence of any Event of Default, the exercise by Lender of any remedies 
set forth in this Paragraph 22, or the commencement of foreclosure 
proceedings against the Mortgaged Property shall not waive the Lender's right 
to foreclose or operate as a bar or estoppel to the exercise of any other 
rights or remedies of the Lender provided for in this Mortgage.    

    23.  Writ of Ejectment.  In the event of the occurrence of an Event of 
Default, and Lender's Commencement of foreclosure proceedings under this 
Agreement, Mortgagor hereby authorizes and empowers the Clerk of Court or any 
attorney of any court of record in the Commonwealth of Massachusetts or 
elsewhere, as attorney for the Mortgagor and all persons claiming under or 
through the Mortgagor to sign an agreement for entering in any competent 
court an amicable action in ejectment for possession of the Mortgaged 
Property which is the subject of this Mortgage and to appear for and confess 
judgment against the Mortgagor, and against all persons claiming under or 
through the Mortgagor, for the recovery by the Lender of possession of the 
same, without any stay of execution, for which this Mortgage or a copy 
thereof verified by affidavit, shall be sufficient warrant; and thereupon a 
writ of possession may be issued forthwith, without any prior writ or 
proceeding whatsoever.  The Mortgagor hereby releases the Lender from all 
errors and defects whatsoever in entering such action and judgment and in 
causing such writ or writs to be issued and hereby agrees that no writ or 
error, appeal, petition to open strike-off judgment, or other objection shall 
be filed or made with respect thereto.  If, for any reason after such action 
has been commenced, the same shall be discontinued or possession of the 
Mortgaged Property which is the subject of this Mortgage shall remain in or 
be restored to the Mortgagor, the Lender shall have the right for the same 
default or any subsequent default to bring one or more further amicable 
actions as above provided to recover possession of the Mortgaged Property 
which is the subject of this Mortgage.  The Lender may bring such amicable 
action in ejectment before or after the institution of foreclosure 
proceedings upon this Mortgage, or after judgment thereon, or after sale of 
the Mortgaged Property which is the subject of this Mortgage by the Sheriff.

    24.  Rights and Remedies Cumulative.

         (a)  The rights and remedies of Lender as provided in this Mortgage, 
in the Note, and in the Financing Agreements shall be cumulative and 
concurrent; may be pursued separately, successively or together against 
Mortgagor, against the Mortgaged Property, or any 

                                          20





other person liable hereunder or thereunder, at the sole discretion of 
Lender; and may be exercised as often as occasion thereof shall arise.  The 
failure by Lender to exercise any such right or remedy on one or more 
occasions shall in no event be construed as a waiver or release thereof.

         (b)  Any failure by Lender to insist upon strict performance by 
Mortgagor of any of the terms and provisions of this Mortgage, the Note or 
the other Financing Agreements shall not be deemed to be a waiver of any of 
the terms or provisions of this Mortgage, the Note or the other Financing 
Agreements, and Lender shall have the right thereafter to insist upon strict 
performance by Mortgagor of any and all of them.

         (c)  Neither Mortgagor nor any other person now or hereafter 
obligated for payment of all or any part of the Obligations shall be relieved 
of such obligation by reason of the failure of Lender to comply with any 
request of Mortgagor or of any other person so obligated to take action to 
foreclose on this Mortgage or to otherwise enforce any provision of the 
Mortgage, the Note, or the Financing Agreements, or by reason of the release, 
regardless of consideration, of all or any part of the security held for the 
Obligations secured by this Mortgage, or by reason of any agreement or 
stipulation between any subsequent owner of the Mortgaged Property and Lender 
extending the time of payment or modifying the terms of the Mortgage, the 
Note or the Financing Agreements without first having obtained the consent of 
Mortgagor or such other person; and in the latter event Mortgagor and all 
such other persons shall continue to be liable to make payments according to 
the terms of any such extension or modification agreement, unless expressly 
released and discharged in writing by Lender.

         (d)  Lender may release, regardless of consideration, any part of 
the security held for the Obligations without, as to the remainder of the 
security, in any way impairing or affecting the lien of this Mortgage or its 
priority over any subordinate lien.

         (e)  For payment of the Obligations Lender may resort to any other 
security therefor held by Lender in such order and manner as Lender may elect.

         (f)  The receipt by Lender of any sums from Mortgagor after the date 
on which Lender, by reason of default and the expiration of all applicable 
notice and grace periods, elects to accelerate the Obligations secured hereby 
under the Note, or the Financing Agreements, shall not constitute a cure or 
waiver of such default or a reinstatement of the Note or Mortgage unless 
Lender expressly agrees, by written notice to Mortgagor, that such payment 
shall be accepted as a cure or waiver of the default.

    25.  Mortgagor's Waivers.  Mortgagor hereby waives and releases:

         (a)  All benefits that might accrue to Mortgagor by virtue of any 
present or future law exempting the Mortgaged Property, or any part of the 
proceeds arising from any sale thereof, from attachment, levy or sale on 
execution, or providing for any stay of execution, exemption from civil 
process or extension of time for payment; and

                                          21





         (b)  Unless specifically required herein or in the Financing 
Agreements or by law, all notices of Mortgagor's default or of Lender's 
election to exercise, or Lender's actual exercise of any option under the 
Note or this Mortgage.

    26.  Counsel Fees.  If Lender becomes a party to any suit or proceeding 
(including, without limitation, appellate and bankruptcy or other insolvency 
proceedings) affecting the Mortgaged Property, title thereto, the lien 
created by this Mortgage, or Lender's interest therein, or if Lender engages 
counsel to collect any of the Obligations or to enforce performance of the 
agreements, conditions, warranties, covenants, provisions or stipulations of 
this Mortgage, the Note or the Financing Agreements, Lender's costs, expenses 
and reasonable counsel fees, whether or not suit is instituted, shall be paid 
to Lender by Mortgagor, on demand, with interest at the then effective rate 
set forth in the Note, and until paid shall be deemed to be part of the 
Obligations set forth in the Note and secured by this Mortgage.

    27.  Future Advances.  Without limiting any other provisions of this 
Mortgage, this Mortgage secures present and future loans, advances and 
extensions of credit made by Lender to or for the benefit of Mortgagor and 
the lien of such future advances shall relate back to the date of this 
Mortgage. This Mortgage shall also secure additional loans hereafter made by 
Lender to Mortgagor.  Nothing contained herein shall impose any obligation on 
the part of Lender to make any such additional loans, advances and extensions 
of credit to or for the benefit of Mortgagor.

    28.  Communications.  Any notice, request, demand, statement or consent 
desired or required to be given hereunder shall be in writing and shall be 
delivered by hand, sent by certified mail, return receipt requested, sent by 
a nationally recognized commercial overnight delivery service with provisions 
for a receipt, postage or delivery charges prepaid, or sent by facsimile 
transmission, to the Mortgagor or Lender at its respective address set forth 
below (or to such other address as either party may elect, provided that 
notice of such address change has been sent to the other party hereto 
pursuant to the terms hereof), and shall be deemed given (i) when actually 
delivered, if delivered by hand, (ii) upon receipt, if sent by certified 
mail, (iii) the next business day after being placed in the possession of an 
overnight delivery service, if sent by an overnight delivery service or (iv) 
if sent by facsimile transmission, when electronic indication of receipt is 
received.  Notices shall be addressed, in the case of the Mortgagor to such 
party at:

    GTC Mason Laboratories, Inc.
    57 Union Street
    Worcester, MA  01608
    Attn: Controller

    with a copy to:

    John B. Green, Jr., CPA
    Genzyme Transgenics Corporation
    5 Mountain Road
    Framingham, MA  01701
    
                                          22



    
    

and in the case of the Lender, to it at:

    Emerging Technology Fund of the Government
    Land Bank d/b/a MassDevelopment
    75 Federal Street
    Boston, MA  02110
    Attn:  Portfolio Manager

    with a copy to:

    Managing Partner
    Hutchins, Wheeler and Dittmar
    101 Federal Street
    Boston, MA  02110

    29.  Covenant Running with the Land.  Any act or agreement to be done or 
performed by Mortgagor shall be construed as covenant running with the land.

    30.  Entire Agreement.  This Mortgage and the exhibit and documents 
delivered pursuant hereto and in connection herewith constitute the entire 
understanding of the parties to this Mortgage with respect to its subject 
matter, and supersede and replace all other prior or contemporaneous 
agreements. Mortgagor acknowledges that there are no understandings or 
agreements with respect to the matters set forth herein and the financing 
agreements that are not specifically set forth in this Mortgage and such 
exhibits are documents.  If any provision of this Mortgage shall be held to 
be invalid, illegal or unenforceable, such provisions shall nevertheless 
remain valid, legal and enforceable in all other respects to the extent 
permissible; and any such invalidity, illegality or unenforceability shall 
not affect any other provisions of this Mortgage, but this Mortgage shall be 
construed as if such invalid, illegal or unenforceable provision had never 
been contained in this Mortgage,

    31.  Binding Effect - Amendment.  This Mortgage is binding upon and 
inures to the benefit of Mortgagor and Lender and their respective successors 
and assigns.  This Mortgage cannot be changed or amended except by agreement 
in writing signed by the party against whom enforcement of the change or 
amendment is sought.

    32.  Applicable Law.  Notwithstanding the state and/or federal law which 
may apply to the rights and obligations of the parties to the Note and other 
Financing Agreements, this Mortgage shall be governed by and construed 
according to the laws of The Commonwealth of Massachusetts.

    33.  Jurisdiction.  The Mortgagor hereby consents and irrevocably submits 
to the non-exclusive jurisdiction of any state or federal court located in 
any county in The Commonwealth of Massachusetts, as well as to the 
jurisdiction of all courts to which an appeal may be taken from such courts, 
for the purpose of any suit, action or other proceeding 

                                          23





arising out of or in connection with this Agreement and hereby expressly 
waives any and all objections to the venue in any such courts.

    34.  Waiver of Jury Trial.  THE MORTGAGOR AND LENDER EACH HEREBY 
KNOWINGLY, VOLUNTARILY AND INTENTIONALLY WAIVES ANY RIGHT EITHER PARTY MAY 
HAVE OR HEREAFTER HAVE TO A TRIAL BY JURY IN RESPECT OF ANY SUIT, ACTION OR 
PROCEEDING ARISING OUT OF OR RELATING TO THIS NOTE.  The Mortgagor hereby 
certifies that neither the Lender, nor any of the Lender's representatives, 
agents or counsel has represented, expressly or otherwise, that the Lender 
would not, in the event of any such suit, action or proceeding, seek to 
enforce this waiver of right to trial by jury.  The Mortgagor acknowledges 
that the Lender has been induced by this waiver (among other things) to enter 
into the loan transaction evidenced in part by this Mortgage.

    35.  Captions.  The captions preceding the text of the paragraphs or 
subparagraphs of this Mortgage are inserted only for convenience or reference 
and shall not constitute a part of the Mortgage, nor shall they in any way 
affect its meaning construction or effect.

    IN WITNESS WHEREOF, Mortgagor has executed and delivered this instrument 
the day and year first above written.  This instrument is intended to 
constitute an instrument under seal.

WITNESS:                                    GTC MASON LABORATORIES, INC.  
                                            a Massachusetts Corporation



   /s/ Peter J. Dawson                      By:   John B. Green, Jr.    
- -------------------------------                --------------------------
       Peter J. Dawson                      Name:  John B. Green, Jr.
                                            Its:  Vice President and Treasurer

                            COMMONWEALTH OF MASSACHUSETTS

Worcester County, ss                                June 26, 1997

    Then personally appeared the above-named John B. Green, Jr., V.P. and 
Treasurer of GTC Mason Laboratories, Inc. and acknowledged the foregoing 
instrument to be his free act and deed, before me,

                                    /s/ Todd Rodman                
                                  ---------------------------------
                                  Notary Public:  Todd Rodman
                                  My Commission Expires:  7/27/01               


                                          24




                                      EXHIBIT A



PARCEL I

The land in Worcester, Massachusetts with the buildings thereon, and all the
privileges and appurtenances thereto belonging, bounded and described as
follows:

BEGINNING at the intersection of the easterly line of Union Street and the
southerly line of Market Street; 

THENCE S. 75-Registered Trademark- 46' E., by said Market Street, one hundred 
forty-three and 6/10 (143.6) feet to land now or formerly of Worcester & 
Nashua Railroad Corporation;

THENCE S. 10-Registered Trademark- 58' E., by said Railroad Corporation land 
sixty-seven and 8/10 (67.8) feet to land now or formerly of the Geo. C. 
Whitney Company;

THENCE N. 80-Registered Trademark- 21' W., by said Geo C. Whitney Company 
land one hundred fifty and 38/100 (150.38) feet to the easterly line of Union 
Street;

THENCE N. 2-Registered Trademark- 51 ' W., by said Union Street, seventy-six 
and 83/100 (76.83) feet to the point of beginning.

Included in the foregoing description and hereby conveying that portion of the
premises registered in land Court Case No. 181 and shown on certificate of title
registered in Book 23, Page 4472, No. 4472 in Worcester Registry District of
Worcester County, bounded and described as follows:

Northerly by Market Street seven and 4/10 (7.4) feet;

Easterly by land formerly of Arthur M. Taft, now or formerly of George L.
Brownell, sixty-six and 42/100 (66.42) feet;

Southerly by land formerly of George S. Paine, now or formerly of the Geo. C.
Whitney co. six and 35/100 (6.35) feet;

Westerly by land formerly of Rose H. Mahan et al, now or formerly of said George
L. Brownell, thirty-one and 31/100 (31.31) feet;

Southerly again by land now or formerly of said Brownell, one and 61/100 (1.61)
feet; and

Westerly again by land formerly of Mary E. Erwin et al, now of said George L.
Brownell, thirty five and 41/100 (35.41) feet.

                                       25


All of said boundaries are determined by the Land Court to be located as 
shown on a subdivision plan drawn by O. Willis Rugg, C.E. dated May,1910, as 
approved by said Court, and filed with Land Registration Certificate number 
232.  Being Lot A on said plan. 

Being the same premises conveyed to the Mortgagor by deed dated May 30, 1997 and
recorded with the Worcester District Registry of Deeds in Book, Page and
registered as Document No. 65140. 

Parcel I is conveyed subject to the following: 

Party Wall Agreement recorded with the Worcester District Registry of Deeds in
Book 1931, Page 21; 

Notice of Special Permit recorded with the Worcester District Registry of Deeds
in Book 12931, Page 177 and registered as Document No.50859; 

Special Permit recorded with the Worcester District Registry of Deeds in Book
13378, Page 126; 

Reservation, easements, covenants, agreements, restrictions, provisions and
limitations recorded with the Worcester District Registry of Deeds in Book
10094, Page 27 and registered as Document No.50858; 

Rights, reservations and restrictions as referred to in a deed recorded with the
Worcester District Registry of Deeds in Book 3467? Page 334; 

Notice of Special Permit recorded with the Worcester District Registry of Deeds
in Book 18126, Page 206 and registered as Document No. 

PARCEL II

A parcel of land situated on the northerly side of Market Street in 
Worcester, Massachusetts and shown as Parcel No.21A on a plan entitled 
"Worcester Redevelopment Authority, City of Worcester, Massachusetts, East 
Central Urban Renewal Area, Disposition Parcels No. 21 A and 21B", dated 
August, 1976, prepared by Fay, Spofford and Thorndike, Inc., Engineers, 
Boston, Massachusetts, recorded in Worcester District Registry of Deeds, Plan 
Book 437, Plan 22, and bounded and described as follows: 

BEGINNING at a point being the intersection of the westerly line of Summer
Street and the northerly line of Market Street; 

THENCE North 82-Registered Trademark- 24' 40" West, by the northerly line of 
Market Street, sixty-two and 94/100 (62.94) feet to a point; 

THENCE North 16-Registered Trademark- 55' 15" West, by land now or formerly 
of Massachusetts Electric Company, one hundred ten and 24/100 (110.24) feet 
to a point; 

                                       26


THENCE South 74-Registered Trademark- 44' 28" East, by land now or formerly 
of Worcester Redevelopment Authority (Parcel No. 21B), forty-seven and 78/100 
(47.78) feet to a point; 

THENCE South 28-Registered Trademark- 29' 58" East, by land now or formerly 
of Worcester Redevelopment Authority (Parcel No. 21B), one hundred four and 
04/100 (104.04) feet to a point; 

THENCE South 07-Registered Trademark- 22' 57" West, by the westerly line of 
Summer Street, nine and 85/100 (9.85) feet to the point of beginning. 

Containing about 5,485 square feet as shown on said Plan. 

Being the same premises conveyed to the Mortgagor by deed dated May 30,1997 and
recorded with the Worcester District Registry of Deeds in Book _____, Page
________.

Parcel II is conveyed subject to the following: 

Notice of Special Permit recorded with the Worcester District Registry of Deeds
in Book 12931, Page 177 and registered as Document No.50859; 

Special Permit recorded with the Worcester District Registry of Deeds in Book
13378, Page 126; 

Reservation, easements, covenants, agreements, restrictions, provisions and
limitations recorded with the Worcester District Registry of Deeds in Book
10094, Page 27 and registered as Document No. 50858; 

Notice of Special Permit recorded with the Worcester District Registry of Deeds
in Book 18126, Page 206 and registered as Document No. 





                                       27

 
                                   EXHIBIT B


                                     LEASES


                                      None





                                       28