Exhibit 10.28


Certain portions of this Exhibit have been omitted based upon a request for 
confidential treatment pursuant to Rule 406 under the Securities Act of 1933. 
The omitted portions have been filed separately with the Securities and 
Exchange Commission.



                              DISTRIBUTION AGREEMENT

      THIS DISTRIBUTION AGREEMENT (hereinafter referred to as the 
"Agreement") is made and entered into as of the 30th day of September, 1994, 
by and between NOVA FACTOR, INC., a Tennessee corporation (hereinafter 
referred to as "Nova Factor"), and GENZYME CORPORATION, a Massachusetts 
corporation (hereinafter referred to as "Genzyme").

                                   WITNESSETH:

     WHEREAS, Genzyme is the manufacturer of the prescription drug 
Cerezyme-TM- which has been approved by the United States Food and Drug 
Administration for the treatment of Gaucher's disease;

     WHEREAS, Nova Factor and Genzyme have previously entered into a 
Distribution Agreement dated June 14, 1994 for the distribution of 
Cerezyme-TM-, as amended by an Extension Agreement dated June 24, 1994, and a 
second Extension Agreement dated September 28th, 1994 (collectively, the 
"Original Distribution Agreement");

     WHEREAS, in order to facilitate distribution of Cerezyme-TM- on a more 
permanent basis, Nova Factor desires to purchase Cerezyme-TM- from Genzyme, 
and Genzyme desires to sell Cerezyme-TM- to Nova Factor for resale, upon the 
terms and subject to the conditions hereinafter set forth; and

     WHEREAS, the Original Distribution Agreement has expired and the terms 
and conditions of this Agreement shall govern all sales of Cerezyme-TM- 
to Nova Factor by Genzyme, including sales pursuant to the Original 
Distribution Agreement.



     NOW, THEREFORE, for an in consideration of the mutual promises contained 
herein and for other good and valuable consideration, the receipt and 
adequacy of which are hereby acknowledged, the parties hereto agree as 
follows:

                                   ARTICLE I

                                DISTRIBUTORSHIP

     1.1  Appointment.  Genzyme hereby appoints Nova Factor at act as a 
distributor of Cerezyme-TM- in all the states of the United States, and 
Nova Factor hereby accepts such appointment. During the period of time that 
this Agreement is in effect, Nova Factor shall sell Cerezyme-TM- to 
third parties and perform the other obligations set out herein.

     1.2  Territory.  Subject to rights of Genzyme under this Section 1.2, 
Nova Factor shall be a distributor of Cerezyme-TM- in all states of the 
United States. The Parties further agree to acknowledge that (1) Genzyme may 
distribute Cerezyme-TM- in all the states of the United States directly 
through health care providers and pharmacies, and notwithstanding the grant of 
a distributorship to Nova Factor, such direct distribution by Genzyme shall 
not be construed to be a violation of this Agreement and (2) Genzyme may at its 
option appoint additional distributors of Cerezyme-TM- in any or all of 
the states of the United States. Genzyme will provide Nova Factor with notice 
of the appointment of any additional distributors as of the effective date of 
any such appointment.

     1.8  Terms Applicable to Distributorship.  Nova Factor shall have sole 
responsibility and authority for determining the price at which it will 
resell Cerezyme-TM- to its customers.  Genzyme shall not be involved in that 
determination in any way. In the event that Nova Factor determines to sell 
Cerezyme-TM- at the price per unit at which it buys Cerezyme-TM- from 
Genzyme, the distributorship shall be subject to the terms and conditions set 
forth in Article III of this Agreement. In

                                       2



the event Nova Factor determines to sell Cerezyme-TM- at a price other 
than the price per unit at which it buys Cerezyme-TM- from Genzyme, 
the purchase and sale of Cerezyme-TM- shall be conducted in the manner 
set forth in Article II of this Agreement. Immediately upon execution of this 
Agreement, Nova Factor shall make an initial written election whether to be 
subject to the terms of Article II or Article III of this Agreement. During 
the term of this Agreement, Nova Factor may from time to time change this 
election upon ninety (90) days prior written notice to Genzyme.

     1.4  Security Interest.  Nova Factor shall enter into a Security 
Agreement, substantially in the form of Exhibit A attached hereto (the 
"Security Agreement"), to secure Nova Factor's obligations to pay Genzyme for 
Cerezyme-TM- provided to Nova Factor under this Agreement. 

                                   ARTICLE II

                    PURCHASE OF CEREZYME-TM- FOR RESALE

     2.1  Election of Article II. This Article II shall govern the terms and 
conditions of the sale of Cerezyme-TM- to Nova Factor by Genzyme, to 
the exclusion of Article III at such times during the terms of this Agreement 
as Nova Factor elects in accordance with Section 1.3 of this Agreement.

    2.2  Orders for Cerezyme-TM-.  Nova Factor shall order Cerezyme-TM- from 
Genzyme, and Genzyme shall sell Cerezyme-TM- to Nova Factor; provided 
however, that any portion of an order that remains unfilled * days after 
receipt of such order by Genzyme may be cancelled at Nova Factor's option 
upon notice to Genzyme. Genzyme shall ship Cerezyme-TM- at its cost to Nova 
Factor in a sealed vial. Each vial shall contain 200 units of Cerezyme-TM-. 
Each vial of Cerezyme-TM- shall be packaged in an individual box, containing 
a package insert and United States Food Drug Administration ("FDA")-approved 
labeling. Genzyme shall


* Omitted information is the subject of a request for confidential treatment 
  pursuant to Rule 406 under the Securities Act of 1933 and has been filed 
  separately with the Securities Exchange Commission.




                                       3



have the option of shipping several individual boxes in a larger shipping 
container. Genzyme shall ship each order of Cerezyme-TM- to Nova Factor 
at its warehouse in Memphis, Tennessee (the "Warehouse") or such other place 
as the parties shall agree, at Genzyme's expense. Shipment shall be made by 
common carrier, overnight courier or any other similar method of shipment in 
Genzyme's discretion.

     2.3  Title.  Upon the shipment of Cerezyme-TM- to Nova Factor, title to 
the Cerezyme-TM- shall pass to Nova Factor. Upon receipt by Nova Factor, Nova 
Factor shall assume all responsibility for the marketing, storage, insurance, 
delivery and billing of all Cerezyme-TM- provided to it under this Article 
II. Upon receipt of each shipment of Cerezyme-TM- by Nova Factor, Nova Factor 
shall immediately inspect the shipment for obvious damage to the shipping 
container, and each box containing a vial of Cerezyme-TM-. Nova Factor shall 
have no obligation to inspect the contents of the vials, nor shall Nova 
Factor open or unseal the vials. Nova Factor shall also confirm whether the 
number of vials received by Nova Factor equals the number of vials recorded 
on the applicable shipping documents, and Nova Factor shall note any 
discrepancies in the number of vials received by Nova Factor on the shipping 
documents accompanying such shipment of Cerezyme-TM- and immediately notify 
Genzyme of any such discrepancies. Nova Factor shall not manufacture, mix or 
process any Cerezyme-TM-.

     2.4  Billing.  No earlier than the date of shipment to Nova Factor, 
Genzyme shall invoice Nova Factor for each shipment of Cerezyme-TM- at 
Genzyme's * price. Payment of the invoice shall 
be due, net of approved returns, * (*) days from the date of the 
invoice. In the event that Nova Factor fails to pay such invoice in full 
within * (*) days from the date of the invoice. In the event that Nova 
Factor fails to pay such invoice in full within * (*) days Nova Factor 
shall pay Genzyme late payment charges of * percent (*%) per annum on all 
unpaid amounts due under such invoice calculated form the end of that * 
(*) day period. The parties hereto agree that should any provision of this 
Section 2.4



* Omitted information is the subject of a request for confidential treatment 
  pursuant to Rule 406 under the Securities Act of 1933 and has been filed 
  separately with the Securities Exchange Commission.


                                       4



violate any law, rule or regulation pertaining to issuing or the contracting 
for or charging of interest, then the excess of interest contracted for or 
charged or collected over the maximum lawful rate of interest shall be 
applied as a prepayment of future obligations due by Nova Factor to Genzyme 
under this Article II, and if any amount so prepaid shall be unused upon 
termination of Nova Factor's election to be subject to Article II, or upon 
termination of this Agreement, whichever is earlier, the excess of the 
prepaid amounts over the amounts actually due to Genzyme shall be immediately 
returned to Nova Factor.

     2.5  Compliance with Pharmacy Laws.  Nova Factor shall dispense or ship 
Cerezyme-TM- pursuant to a prescription or authorized purchase order 
solely in compliance with applicable federal or state laws, regulations, and 
orders including pharmacy laws.

     2.6  Pharmacy Records.  Nova Factor shall maintain such pharmacy 
records as are required by applicable federal and state law, regulations and 
orders. Such records shall remain the property of Nova Factor. However, Nova 
Factor shall permit Genzyme access to, and the right to obtain copies of, 
such records, except to the extent limited by law.

     2.7  Packaging.  Nova Factor shall pack Cerezyme-TM- in cold 
packs, cartons or other packaging with such insulation or other packing 
materials as required by the package insert or FDA-approved labeling, or as 
otherwise agreed by the parties.

     2.8  Recall information. Nova Factor shall generate such distribution, 
sales, customer account and financial reports, including records necessary to 
trace lot numbers to Cerezyme-TM- Patients to monitor shelf life and 
trace shipments and such other data and information as the parties shall 
agree.


                                       5




                                   ARTICLE III
                             Coordinate Distribution                      
                             -----------------------
     3.1  Election of Article III. This Article III shall govern the terms and 
conditions of the sale of Cerezyme-TM- to Nova Factor by Genzyme, to the 
exclusion of Article II, at such times during the term of this Agreement as 
Nova Factor so elects in accordance with Section 1.3 of this Agreement.

     3.2  Purchase and Maintenance of Inventory of Cerezyme-TM-.
          ------------------------------------------------------

          (a)  Sale of Cerezyme-TM-.  Nova Factor shall order Cerezyme-TM- 
from Genzyme, and Genzyme shall sell Cerezyme-TM- to Nova Factor.  Genzyme 
shall at its cost ship each order of Cerezyme-TM- to Nova Factor at its 
warehouse in Memphis, Tennessee (the "Warehouse").  Title to each such order 
of Cerezyme-TM- shipped to Nova Factor hereunder shall pass to Nova Factor at 
the point of shipment to Nova Factor.

          (b)  Nova Factor Inventory.  Nova Factor agrees that it will 
purchase adequate amounts of Cerezyme-TM- so that such inventory, when added 
to Nova Factor's inventory of Ceredase-Registered Trademark- enzyme (the 
"Combined Inventory"), will result in an average of * days Combined 
Inventory during each calendar quarter; provided that, Nova Factor agrees 
that at the option of Genzyme it will purchase adequate amounts of 
Cerezyme-TM- to bring the Combined Inventory to a *-day level prior to the 
end of any such calendar quarter, however, in no event will such purchase 
cause the inventory to exceed an average of * days for such calendar 
quarter; provided further that in no event shall Nova Factor be required to 
have on hand Combined Inventory in excess of * dollars.  The 
calculation of inventory will be based upon the average of the unit sales 
volume for the previous month, the projected unit sales volume for the 
current month, and the projected sales volume for the next month as described 
in Exhibit B attached hereto.  Genzyme shall use reasonable efforts to assure 
that all Cerezyme-TM- shipped to Nova


* Omitted information is the subject of a request for confidential treatment 
  pursuant to Rule 406 under the Securities Act of 1933 and has been filed 
  separately with the Securities Exchange Commission.



                                       6



Factor by Genzyme will have a remaining shelf life of at least ninety (90) 
days.  At any time which is at least thirty (30) days prior to the expiration 
date of Cerezyme-TM-, Nova Factor shall have the right to return to Genzyme 
such Cerezyme-TM- that had a remaining shelf life of less than ninety (90) 
days when it was received by Nova Factor.  All such returns shall be made to 
Genzyme for either replacement Cerezyme-TM- or for a credit to the amount 
owed by Nova Factor to Genzyme equal to Nova Factor' purchase price of such 
Cerezyme-TM- , as may be elected by Genzyme.  The service fees earned by Nova 
Factor for any Cerezyme-TM- returned to Genzyme pursuant to this Section 
3.2(b) shall be credited against future service fees earned by Nova Factor, 
or Genzyme may request that Nova Factor reimburse it for service fees paid to 
Nova Factor for Cerezyme-TM-  that is returned, as Genzyme may elect.  Nova 
Factor agrees to use the shortest dated Cerezyme-TM- first.  Nova Factor 
shall provide Genzyme weekly reports on inventory levels, which will be 
subject to audit at Genzyme's expense.

          (c)  Billing.  No earlier than the date of shipment of Cerezyme-TM- 
to Nova Factor, Genzyme shall invoice Nova Factor for such shipment at 
Genzyme's * price for Cerezyme-TM-.  Payment 
against the invoice, net of returns, will be due from Nova Factor within 
* (*) days of the date of Genzyme's invoice.  In the event that Nova 
Factor fails to pay any such invoice in full within * (*) days, Nova 
Factor shall pay Genzyme late payment charges of * percent (*%) per annum 
on all unpaid amounts due under such invoice calculated from the end of that 
* (*) day period.  The parties hereto agree that should any provision of 
this Section 3.2(c) violate any law, rule or regulation pertaining to usury 
or the contracting for or charging of interest, then the excess of interest 
contracted for or charged or collected over the maximum lawful rate of 
interest shall be applied as a prepayment of future obligations due by Nova 
Factor to Genzyme under this Article III, and if any amount so prepaid shall


* Omitted information is the subject of a request for confidential treatment 
  pursuant to Rule 406 under the Securities Act of 1933 and has been filed 
  separately with the Securities Exchange Commission.




                                       7



be unused upon termination of Nova Factor's election to be subject to Article 
III, or upon termination of this Agreement whichever is earlier, the excess 
of the prepaid amounts over the amounts actually due to Genzyme shall be 
immediately returned to Nova Factor.

     3.3  Shipment and Warehousing.
          -------------------------

          (a)  Shipment to Nova Factor.  Genzyme shall ship Cerezyme-TM- to 
Nova Factor in a sealed vial.  Each vial shall contain 200 units of 
Cerezyme-TM-.  Each vial of Cerezyme-TM- shall be packaged in an individual 
box, containing a package insert and United States Food and Drug 
Administration ("FDA")-approved labeling.  Genzyme shall have the option of 
shipping several individual boxes in a larger shipping container.

          (b)  Inspection of Shipment.  Upon receipt of each shipment of 
Cerezyme-TM- by Nova Factor, Nova Factor shall immediately inspect the 
shipment for obvious damage to the shipping container and each box containing 
a vial of Cerezyme-TM-.  Nova Factor shall have no obligation to inspect the 
contents of the vials, nor shall Nova Factor open or unseal the vials.  Nova 
Factor shall also confirm whether the number of vials received by Nova Factor 
equals the number of vials recorded on the applicable shipping documents, and 
Nova Factor shall note any discrepancies in the number of vials received by 
Nova Factor on the shipping documents accompanying such shipment of 
Cerezyme-TM- and immediately notify Genzyme of any such discrepancies.

          (c)  Storage.  Nova Factor shall store all Cerezyme-TM- at the 
Warehouse and shall not store Cerezyme-TM- at any other location without the 
prior written consent of Genzyme.  Nova Factor shall not manufacture, mix, or 
process any Cerezyme-TM-.  Nova Factor shall be responsible for inventory 
control of Cerezyme-TM-, subject to Genzyme's determination of the 
appropriate shelf life of Cerezyme-TM-.  Nova Factor shall segregate 
Cerezyme-TM- from any other item stored


                                       8



by it and shall not commingle Cerezyme-TM- with any other item in its custody 
or control.  For so long as any Cerezyme-TM- is in Nova Factor's possession, 
Nova Factor shall store Cerezyme-TM- in accordance with the requirements set 
forth in the Cerezyme-TM- package insert and FDA-approved labeling, including 
any requirements with respect to refrigeration.

          (d)  Risk of Loss.  Nova Factor shall bear the risk of loss, theft, 
destruction or damage of each vial of Cerezyme-TM- from receipt of each 
shipment containing the vial from Genzyme until delivery of such vial of 
Cerezyme-TM- to a patient (a "Patient"), physician, clinic or hospital (any 
of a Patient, physician, clinic or hospital may thereafter be referred to as 
a "Cerezyme-TM- Customer").  Genzyme shall, at its cost, insure all 
Cerezyme-TM- against loss from the time of shipment until delivery to Nova 
Factor.  Nova Factor shall, at its cost, insure all Cerezyme-TM- in its 
possession until the delivery of Cerezyme-TM- to a Cerezyme-TM- Customer for 
its replacement (i.e., market) value against fire, theft, loss or 
destruction, and such other risks as are customarily insured against by 
prudent persons in a similar line of business, with an insurance carrier 
qualified to do business (in the State of Tennessee or such other place as 
Genzyme may authorize.) Nova Factor shall provide Genzyme with certificates of 
such insurance prior to Nova Factor's election to be subject to the terms of 
Article III.

     3.4  Marketing and Sales.  Genzyme covenants and agrees that it will 
provide such marketing, sales and patient/physician educational materials as 
shall be deemed necessary by Genzyme to adequately promote and market 
Cerezyme-TM-.  Nova Factor shall have no responsibility for undertaking any 
sales efforts in connection with Cerezyme-TM- and all inquiries received by 
Nova Factor concerning potential sales or prescriptions of Cerezyme-TM- shall 
be referred to Genzyme by Nova Factor.

                                       9




     3.5  Designation of Patients and Recipients.
          ---------------------------------------

          (a)  Patient Status.  Nova Factor shall sell Cerezyme-TM- under 
this Article III only to a patient previously approved by Genzyme (an 
"Approved Patient") or to a physician, hospital or clinic for administration 
to an Approved Patient (a "Cerezyme-TM- Customer").  No patient previously 
approved to receive Ceredase-Registered Trademark- enzyme will be provided 
Cerezyme-TM- without Genzyme's prior approval.  If sale is made to an 
Approved Patient, shipment may nonetheless be made to a physician, hospital 
or clinic, which will dispense Cerezyme-TM- to the Approved Patient.  Before 
approving the initial shipment to, or on behalf of, a patient, Genzyme shall 
make such inquires as Genzyme, in its sole discretion, deems appropriate to 
determine whether Cerezyme-TM- is indicated for such patient, which inquiries 
shall include obtaining a letter or summary of medical necessity signed by 
such patient's physician where required by the third party payor and 
determining the availability of insurance or other source for payment for 
Cerezyme-TM-.

          (b)  Patient Tracking System.  Nova Factor shall establish a 
patient tracking system in a mutually acceptable format that tracks the 
dose, dosage changes and frequency of administration of Cerezyme-TM- 
prescribed by physicians for all Approved Patients.  Nova Factor shall 
provide Genzyme with data on all Approved Patients added each month.

          (c)  Transmission of Records.  Genzyme shall promptly forward to 
Nova Factor such documentation as is reasonably necessary for Nova Factor to 
transmit the initial shipment of Cerezyme-TM- to any Approved Patient and to 
permit Nova factor to file claims with a third party payor, if any, or to 
submit invoices to the appropriate Cerezyme-TM- Customer.

     3.6  Distribution and Pharmacy Services.
          -----------------------------------

          (a)  Physician Authorization.  following the inquiry provided for 
in Section 3.5 of this Agreement, Genzyme shall notify Nova Factor that a 

                                  10



patient is an Approved Patient.  Prior to dispensing Cerezyme-TM- to or on 
behalf of, an Approved Patient, Nova Factor shall obtain:

               (i)  a prescription which is either (A) in proper form signed 
by the Approved Patient's physician, which physician shall be duly licensed 
to practice medicine and dispense drugs in accordance with applicable state 
and federal law, or (B) communicated verbally by said physician if such 
communication is valid under applicable state law; or

               (ii)  an authorized purchase order from an entity, such as a 
clinic or hospital, authorized under applicable state law to dispense drugs 
to the Approved Patient(s).

In the event that shipment of Cerezyme-TM- is to be made to a Cerezyme-TM- 
Customer who wishes to designate Nova Factor as its billing agent, a signed 
Sales and Billing Agency Agreement (the "Sales Agreement"), substantially in 
the form of Exhibit C attached hereto, shall be obtained from such 
Cerezyme-TM- Customer.

          (b)  Compliance with Pharmacy Laws.  Nova Factor shall dispense or 
ship Cerezyme-TM- pursuant to a prescription or authorized purchase order 
solely in compliance with applicable federal and state laws, regulations, and 
orders including pharmacy laws.  Nova Factor may ship sufficient amounts of 
Cerezyme-TM- to a physician, hospital or clinic to permit dispensing of 
single or multiple doses, but only if such does(s) are to be administered to 
an Approved Patient(s).  Nova Factor shall not provide Cerezyme-TM- to any 
Cerezyme-TM- Customer without the prior authorization of Genzyme.

          (c)  Pharmacy Records.  Nova Factor shall maintain such pharmacy 
records as are required by applicable federal and state laws, regulations and 
orders.  Such records shall remain the property of Nova Factor.  However, Nova


                                      11



Factor shall permit Genzyme access to, and the right to obtain copies of, 
such records, except to the extent limited by law.

     3.7  Shipment of Cerezyme-TM- to Cerezyme-TM- Customers.
          ---------------------------------------------------

          (a)  Confirmation of Information.  Nova Factor shall, before 
dispensing or shipping Cerezyme-TM-, (i) confirm with the Approved Patient's 
third party payor, if any, the necessary billing forms and billing 
procedures, including billing address, required to file any claim for the 
Cerezyme-TM- on Nova Factor's or such Approved Patient's behalf, or, in the 
event Nova Factor is acting as billing agent for a Cerezyme-TM- Customer 
pursuant to an executed Sales Agreement, for such Cerezyme-TM- Customer and 
(ii) make due inquiry whether it may lawfully dispense Cerezyme-TM- in the 
state to which shipment has been directed.

          (b)  Inventory Availability.  Nova Factor shall be required to ship 
Cerezyme-TM- only from Cerezyme-TM- inventory which Genzyme has previously 
delivered to Nova Factor.

          (c)  Packaging.  Nova Factor shall pack Cerezyme-TM- in cold packs, 
cartons or other packaging with such insulation or other packing materials as 
required by the package insert or FDA-approved labeling, or as otherwise 
agreed by the parties.  Nova Factor shall, at its cost, cause Cerezyme-TM- to 
be delivered to Cerezyme-TM- Customers by common carrier, overnight courier 
or other similar method of shipment selected by Nova Factor.

          (d)  Return of Cerezyme-TM-.  In the event that a shipment of 
Cerezyme-TM- is refused or rejected by the Cerezyme-TM- Customer, Nova Factor 
will cause the shipment of Cerezyme-TM- to be returned to the Warehouse at 
Nova Factor's expense.  Upon return, Genzyme will direct Nova Factor, at 
Genzyme's cost, either to (i) return the refused shipment to Genzyme or (ii) 
destroy the refused shipment.


                                      12



         3.8  Billing Services.

                (a)   After compliance by Nova Factor with its obligations 
under Section 3.7(a) hereof, upon delivery of Cerezyme-TM- to a Cerezyme-TM- 
Customer, Nova Factor shall prepare and mail an invoice for such shipment 
within * (*) business days after receipt by Nova Factor of the 
documentation necessary for billing to be provided by Genzyme under Section 
3.5 of this Agreement and thereafter to any third party payor. Each invoice, 
as appropriate, shall be on a form agreed to by the parties or upon the 
standardized form (such as HCFA - 1500 - Health Insurance Claim Form) 
required by a third party payor or in such electronic billing format as may 
be required. In the event Cerezyme-TM- is sold to an Approved Patient, Nova 
Factor shall submit the invoice to the Approved Patient or, if authorized to 
do so, to the applicable third party payor. If Nova Factor has sold 
Cerezyme-TM- to a Cerezyme-TM- Customer, Nova Factor shall submit the invoice 
to the Cerezyme-TM- Customer (except a Cerezyme-TM- Customer for which Nova 
Factor acts as a billing agent). If Nova Factor has shipped Cerezyme-TM- to a 
Cerezyme-TM- Customer for which Nova Factor acts as billing agent, Nova 
Factor shall submit the invoice in the manner provided in the Sales Agreement.

                (b)   Nova Factor shall use reasonable efforts to comply with 
all requirements for the submission of claims imposed by each third party 
payor for an Approved Patient.

                (c)   Nova Factor shall comply with all applicable federal 
and state laws, regulations and orders, including Medicare requirements, in 
its capacity as billing agent for any Cerezyme-TM- Customer pursuant to the 
Sales Agreement.

         3.9   Collection.  Nova Factor shall be responsible for the 
collection of all monies due for the sale by Nova Factor of Cerezyme-TM- and 
all such monies shall belong to Nova Factor.


* Omitted information is the subject of a request for confidential treatment 
  pursuant to Rule 406 under the Securities Act of 1933 and has been filed 
  separately with the Securities Exchange Commission.




                                       13


         3.10  Bad Debts and Delinquent Accounts. Nova Factor shall bear the 
risk of loss on all uncollected accounts and bad debts resulting from sales 
and shipments of Cerezyme-TM- by Nova Factor under this Article III.

         3.11  Accounting and Financial Reporting. Nova Factor shall maintain 
records and books of account, in the form of computer data or otherwise, 
which will identify Nova Factor's inventory of Cerezyme-TM-, each sale and 
shipment of Cerezyme-TM- by Nova Factor (showing recipient's name, amount of 
drug dispensed, and charges for said drug), and all revenue collected from 
the sale and distribution of Cerezyme-TM- by Nova Factor properly applied to 
and against the invoices for said drug generated by Nova Factor. In addition 
to these records, Nova Factor shall generate such distribution, sales, 
customer, account and financial reports, including records necessary to trace 
lot numbers to Cerezyme-TM- patients, to monitor shelf life and trace 
shipments and such other data and information (collectively, "Accounting 
Records") as the parties shall agree. Nova Factor agrees that on a monthly 
basis, it will furnish Genzyme with an accounting of all Cerezyme-TM- 
received, all Cerezyme-TM- shipped and all bills submitted and all revenues 
collected in connection with Cerezyme-TM- sold and distributed, by Nova 
Factor during the month.

         3.12  Computer System Access

               (a)   Terms of Access. Nova Factor shall maintain an IBM AS400 
computer system. Nova Factor shall establish a separate computer data base for
demographic, account and patient information regarding Cerezyme-TM- within 
Nova Factor's IBM AS400 computer system, or any successor hardware. Genzyme 
shall be given direct inquiry (read only) access to the computer data base 
for Cerezyme-TM- maintained within Nova Factor's computer system; provided, 
however, that Genzyme shall be responsible for obtaining at its cost all 
compatible terminal hardware, modems, telephone access lines, and all other 
hardware and

                                       14


materials necessary to access Nova Factor's computer system. Nova Factor 
shall also have full access to this data base. Nova Factor will make 
available to Genzyme the necessary phone numbers, access codes and passwords 
which shall provide Genzyme with direct inquiry access solely to the Nova 
Factor computer data base concerning Cerezyme-TM-. Genzyme shall be 
responsible for all long distance charges incurred by Genzyme in using dial 
access to Nova Factor's computer system. Genzyme acknowledges that the entry 
of data and information into the computer data base may be delayed, however, 
Nova Factor will make reasonable efforts to ensure that the information is 
current and will promptly notify Genzyme if the information in the data base 
is not current.

               (b)   Confidentiality of Computer Data. The information 
contained in the data base is considered by Nova Factor to be confidential. 
Nova Factor shall provide Genzyme with a list of material in the database 
considered confidential by Nova Factor in accordance with Section 4.5 hereof. 
Genzyme shall deal with all such data designated as confidential by Nova 
Factor, together with any computer access codes and passwords provided to 
Genzyme by Nova Factor to  permit Genzyme access to said database, in 
accordance with Section 4.5 hereof.

         3.13  Audit. Nova Factor shall allow Genzyme access to Nova Factor's 
books and records related to its sale of Cerezyme-TM- under this Article III 
for purposes of audit. Any such audit shall be at Genzyme's cost and shall be 
conducted at Nova Factor's offices in Memphis, Tennessee during Nova Factor's 
regular business hours, and upon Genzyme providing Nova Factor with 
reasonable advance notice. Any amounts found from such audit to be due and 
owing Genzyme but unpaid shall thereafter be paid in accordance with the 
terms of this Agreement.

         3.14  Personnel. Nova Factor shall designate certain Nova Factor 
personnel to perform Nova Factor's obligations under this Article III, 
including those with respect to inventory, storage, shipment, billing, 
collections, accounting

                                       15


and recordkeeping. Nova Factor shall be solely responsible for its employees' 
salaries, federal and state income tax withholding, Social Security tax 
withholding, worker's compensation benefits and fringe benefits. When Nova 
Factor determines that the volume of its distribution of Cerezyme-TM- 
requires, Nova Factor shall dedicate certain of its personnel, which Nova 
Factor shall select, exclusively to handle Nova Factor's obligations under 
this Article III.

         3.15  Compensation to Nova Factor.

               (a)   Service Fee. In consideration for the services provided 
to Genzyme by Nova Factor under this Article III, Genzyme agrees to pay to 
Nova Factor a service fee for each unit of Cerezyme-TM- purchased by Nova 
Factor pursuant to this Article III. For Cerezyme-TM- purchased until and 
including December 31, 1994, the amount of the service fee per unit shall be 
$*. The amount of the service fee will be renegotiated for each calendar 
year (or a portion thereof) thereafter in accordance with Section 3.17 hereof.

               (b)   Invoicing. Genzyme shall pay this service fee to Nova 
Factor within * (*) days of the date that Genzyme invoices Nova Factor 
for a shipment of Cerezyme-TM-. In the event that Genzyme fails to pay any 
such service fee in full within * (*) days, Genzyme shall pay Nova 
Factor late payment charges of * percent (*%) per annum on all unpaid 
amounts due pursuant to this Section 3.15 calculated from the end of that 
* (*) day period. The parties hereto agree that should any provision of 
this Section 3.15 violate any law, rule or regulation pertaining to usury or 
the contracting for or charging of interest, then the excess of interest 
contracted for or charged or collected over the maximum lawful rate of 
interest shall be applied as a prepayment of future obligations due by 
Genzyme to Nova Factor under this Article III, and if any amount so prepaid 
shall be unused upon termination of Nova Factor' election to be subject to 
Article III, the


* Omitted information is the subject of a request for confidential treatment 
  pursuant to Rule 406 under the Securities Act of 1933 and has been filed 
  separately with the Securities Exchange Commission.




                                       16


excess of the prepaid fees over the fees actually due to Nova Factor shall be 
immediately returned to Genzyme.

               (c)   Reimbursement for Expenses. Upon presentment of invoices 
or other documentation of such expenses, Genzyme will reimburse Nova Factor 
for any reasonable expenses which are the responsibility of Genzyme under 
this Article III so long as such expenses are advanced by Nova Factor with 
the prior approval of Genzyme. Genzyme will reimburse such expenses within 
* (*) days of Genzyme's receipt of the documentation of any such 
expenses. Notwithstanding this Section 3.15(c), Nova Factor shall be solely 
responsible for expenses incurred by it in carrying out its obligations under 
this Article III, including but not being limited to, shipping, obtaining 
supplies, postage and printing necessary for the collection of accounts 
receivable generated by Nova Factor's distribution of Cerezyme-TM-.

         3.16 Taxes. Nova Factor shall prepare and file all sales and use 
tax returns which are required by, and pay all taxes due to any state or 
local governmental entity from, or as a result of, the sale or distribution of 
Cerezyme-TM- by Nova Factor. To the extent directed by any Cerezyme-TM- 
Customer for whom Nova Factor acts as billing agent, Nova Factor will include 
the amount of such taxes on invoices submitted by Nova Factor on behalf of 
said Cerezyme-TM- Customer if sales or use taxes are require to be collected 
from said Cerezyme-TM- Customer. Nova Factor shall be liable for any personal 
property taxes on inventory of Cerezyme-TM- held in Tennessee by Nova Factor, 
any gross receipts or business taxes resulting from the sale or distribution 
of Cerezyme-TM- by Nova Factor, and to the extent required, shall include 
such inventories of Cerezyme-TM- held by Nova Factor, and sales of 
Cerezyme-TM- distributed by Nova Factor, in Nova Factor's respective federal 
and state income and franchise tax returns. To the extent that Nova Factor is 
required to file tax returns with any governmental entity in regard to the 


* Omitted information is the subject of a request for confidential treatment 
  pursuant to Rule 406 under the Securities Act of 1933 and has been filed 
  separately with the Securities Exchange Commission.




                                       17


distribution and sale of Cerezyme-TM- by Nova Factor pursuant to this Article 
III and to remit taxes in connection therewith, other than income taxes for 
service fee income pursuant to Section 3.15 hereof, Genzyme shall promptly 
reimburse Nova Factor for such taxes upon presentation by Nova Factor of 
evidence reasonably satisfactory to Genzyme that Nova Factor has paid such 
taxes.

         3.17  Renegotiation of Terms.

               (a)   Renegotiation of Terms of Article III. In the event that 
Nova Factor elects to be subject to Article III during the first year of this 
Agreement, and if, upon the first anniversary of the effective date of this 
Agreement, either of the following shall have occurred: *, Nova Factor may, 
within * (*) days after such anniversary, request in writing that Genzyme 
renegotiate those terms of this Agreement specified in such request. Genzyme 
shall have * (*) days from the receipt of such request to agree to renegotiate 
the terms specified in the request, together with such terms as Genzyme shall 
specify in its response, or to give notice of termination of this Agreement 
under Section 4.2(b)(ii) hereof.

               (b)   Renegotiation of Service Fee. The service fee to be paid 
by Genzyme to Nova Factor for services provided under this Agreement will be 
renegotiated by the parties between January 1 and February 28 of each 
calendar year, with changes in such fee, if any, to become effective with 
respect to Cerezyme-TM- purchased after January 1 of the applicable calendar 
year, subject at all times to the parties' rights of termination under 
Section 4.2(b)(ii). The service fee to be paid with respect to Cerezyme-TM- 
purchased during the time period the


* Omitted information is the subject of a request for confidential treatment 
  pursuant to Rule 406 under the Securities Act of 1933 and has been filed 
  separately with the Securities Exchange Commission.




                                       18


parties are negotiating such fee shall be paid at the rate in effect during 
the preceding year, and once the parties agree upon a change in such fee, if 
any, Genzyme shall promptly pay to Nova Factor the amount by which the new 
service fee exceeds the previous service fee, or Nova Factor promptly shall 
reimburse Genzyme the amount by which the new service is less than the 
previous service fee, whichever is applicable. The parties agree to use 
reasonable efforts to negotiate the service fee by February 28 of each 
calendar year.

         3.18  Effect of Termination. Upon termination of Nova Factor's 
election to be subject to this Article III for any reason, Nova Factor shall 
promptly provide Genzyme with a final accounting of units of Cerezyme-TM- 
held in inventory at termination, units shipped, billings, collections and 
such other information contained in the Accounting Records as is requested by 
Genzyme. A copy of all computer and other records concerning Cerezyme-TM-, 
including the Accounting Records, maintained by Nova Factor under this 
Article III, shall be provided to Genzyme; however, Nova Factor shall 
maintain the original of said records.


                                  ARTICLE IV
                                 Miscellaneous

         4.1   Indemnity and Insurance.

               (a)   Indemnification. Nova Factor and Genzyme hereby agree 
that:

                     (i)   Nova Factor shall assume responsibility for and 
         shall indemnify and hold Genzyme harmless and defend Genzyme from 
         all losses (including claims for injuries to employees of Nova 
         Factor or Genzyme), expenses, attorneys' fees, damages, claims and 
         judgments resulting solely from (A) Nova Factor's breach of the 
         terms of this Agreement; (B) the negligent acts or omissions or 
         wrongful acts

                                       19


         of Nova Factor, its agents or employees; or (C) any 
         misrepresentation or breach of any representation or warranty made 
         herein by Nova Factor; provided, however, that Nova Factor shall 
         have no liability to Genzyme for loss of profits to Genzyme in the 
         event Nova Factor is unable, through no fault of Nova Factor's, to 
         ship Cerezyme-TM- to a Cerezyme-TM- Customer; and

                     (ii)  Genzyme shall assume responsibility for and shall 
         indemnify and hold Nova Factor harmless and defend Nova Factor from 
         all losses (including claims for injuries to employees of Nova 
         Factor or Genzyme), expenses, attorneys' fees, damages, claims and 
         judgments resulting solely from (A) Genzyme's breach of the terms of 
         this Agreement; (B) the negligent acts or omissions or wrongful acts
         of Genzyme, its agents or employees; (C) any misrepresentation or 
         breach of representation or warranty made herein by Genzyme; or (D) 
         any defect in the design, manufacture or condition of Cerezyme-TM- 
         supplied to Nova Factor by Genzyme.

            (b)   Insurance. During the term of this Agreement, Nova Factor and
Genzyme will each maintain a general public liability, products liability and 
products property damage insurance, each policy with limits of not less than 
$1,000,000.00 per incident, $3,000,000.00 in the aggregate. All policies 
insuring against liability for bodily injury or death or damage to property 
shall include coverage for claims resulting from the sale and distribution of 
Cerezyme-TM- and in the case of Genzyme, claims resulting from the 
manufacture of Cerezyme-TM-. Genzyme and Nova Factor will provide the other 
party with certificates evidencing the insurance required hereunder, and all 
such policies shall provide that notice of cancellation or termination or 
reduction in the limits of or other material change to the coverage thereof 
shall be provided in advance to the

                                       20


other party. In the event of such cancellation, termination, reduction or 
change of the coverage described herein, the party maintaining such insurance 
shall immediately obtain substitute or replacement coverage. Failure to 
obtain substitute or replacement coverage shall be grounds for the 
termination of this Agreement.

         4.2   Term, Renewal and Termination.

               (a)   Initial Term. Unless otherwise terminated pursuant to 
subsection (c) below, this Agreement shall be for an initial term expiring on 
December 31, 1995 (the "Initial Term").

               (b)   Renewal. Unless otherwise terminated pursuant to 
subsection (c) below, this Agreement will automatically renew at the 
expiration of the Initial Term for an additional period of one year and shall 
thereafter automatically renew from year to year for additional one-year 
periods, unless either party shall give written notice of cancellation to the 
other party at least 90 days prior to the end of the Initial Term or the 
expiration of any extension.

               (c)   Termination. This Agreement shall automatically 
terminate (i) upon the mutual agreement of the parties, (ii) at any time upon
sixty (60) days prior notice by either party hereto, (iii) upon the insolvency 
or bankruptcy of either party, the making by either party of an assignment 
for the benefit of creditors, the consent by either party to the appointment 
of a trustee or receiver, or the appointment without its consent, of a 
trustee or receiver for it or for a substantial part of its property, or (iv) 
upon the institution by or against either party of bankruptcy, 
reorganization, arrangement or insolvency proceedings. In addition, if either 
party hereto shall breach the terms of this Agreement, the nonbreaching party 
may give written notice of the breach to the breaching party, and if said 
breach is not cured within 30 days following the giving of said notice, this 
Agreement shall at the option of the nonbreaching party be terminated

                                       21


immediately upon the conclusion of such 30 day period. Late payment by Nova 
Factor under the terms of Section 3.2(c) hereof shall not constitute a breach 
of the terms of this Agreement sufficient to give rise to termination of this 
Agreement.

               (d)   Return of Cerezyme-TM-. In the event of termination of 
this Agreement, Nova Factor shall cause the inventory of Cerezyme-TM- then in 
Nova Factor's possession to be returned to Genzyme, at Genzyme's cost. Each 
unit of Cerezyme-TM- returned to Genzyme shall be credited in full payment 
for the amount due from Nova Factor for that unit, except any units which are 
destroyed or damaged for which Nova Factor shall bear the risk of loss in 
accordance with Section 3.3(d) hereof. The services fees earned by Nova 
Factor for any Cerezyme-TM- returned to Genzyme pursuant to this Section 
4.2(c) shall be offset against such credit. To the extent the amount credited 
to Nova Factor pursuant to this paragraph exceeds the amount owed by Nova 
Factor to Genzyme at such time, such excess shall be promptly paid by Genzyme 
to Nova Factor.

               (e)   Survival of Obligations. Termination of this Agreement 
shall not relieve either party from any liability or obligation it had 
incurred prior to the date of such termination including, but not limited to, 
obligations to pay any outstanding unpaid amounts due pursuant to this 
Agreement and to accept returns of Cerezyme-TM- in accordance with the 
provisions of this Agreement. It is the express intention and agreement of 
the parties hereto that all the covenants, agreements, warranties and 
indemnities contained in Sections 4.1, 4.5 and 4.7 shall survive the 
termination of this Agreement.

         4.3   Force Majeure. Neither party shall be liable to the other for 
failure or delay in the performance of any of its obligations under this 
Agreement for the time, and to the extent, such failure or delay is caused by 
riots, civil commotion, wars, hostilities between nations, embargoes, acts of 
God, earthquakes, storms, fires, strikes, sabotage, explosions, shortages of 
raw materials or power, or

                                       22


any other matter which is beyond the reasonable efforts of the party to 
control. This provision shall not excuse, or apply to, obligations of a party 
to make monetary payments hereunder.

         4.4   Independent Contractor. Subject to the requirements herein, 
Nova Factor shall determine the time spent and the methods employed in 
carrying out its obligations hereunder, and Nova Factor shall be solely 
responsible for the operation and management of its business. In entering 
into and carrying out its obligations under this Agreement, Nova Factor is an 
independent contractor. Nothing in this Agreement, or in the relationship 
between the parties or in the activities of Nova Factor, its agents or 
employees, an employee of, or joint venturer or partner with, Genzyme, or to 
empower any of them to bind or obligate Genzyme in any way. Nova Factor 
further agrees that it will make no representations with respect to its 
relationship to Genzyme, except that it has contracted with Genzyme to act as 
a distributor of Cerezyme-TM- and to perform the obligations set out herein. 
It is further agreed and understood that Nova Factor is only contracting to 
provide certain specified services to, and purchase Cerezyme-TM- from, 
Genzyme. Genzyme shall be responsible for all costs incurred in operating 
Genzyme's business, and Genzyme shall be solely responsible for the 
management and operation of its business.

         4.5   Confidentiality and Restrictive Covenant.

               (a)   Protection of Documents. Each party has developed or may 
during the term hereof develop, certain formulae, products, methods of doing 
business, and other proprietary information which that party deems to be 
confidential and a trade secret. In the course of fulfilling each party's 
respective obligations hereunder, some of these formulae, products, methods 
and other proprietary information of one party will become known to the other 
party hereto.

                                       23


Each party agrees that it will not duplicate, make use of, or disclose, in 
any manner whatsoever, any information which is deemed to be confidential by 
the other party (as provided in Section 4.5(b) hereof), either during or 
after the term of this Agreement, without the express prior written consent 
of the other party hereto.

               (b)   Designation of Materials. In the event that any 
information deemed to be confidential by a party is provided to the other 
party or its employees or agents in writing, the party providing same shall 
mark the writing as confidential, prior to providing such information to the 
other party. In the event that such information is provided in non-written 
form such as orally, by audio tape, by direct telephonic access to computer 
data bases, videotape or computer software or disc, the party claiming such 
information to be confidential shall, at the time such information is 
furnished to the other party or within fifteen (15) days thereafter, furnish 
to the other party a written list containing a brief description of such item 
and designating such item as confidential. Upon termination of this 
Agreement, all such information, together with any copies thereof, of any 
information hereunder deemed, or designated by a party as, confidential shall 
be returned to the party who supplied the information. Notwithstanding the 
preceding provision, the following types of information provided by a party 
shall always be deemed confidential, whether or not so designated: patient 
medical records; patient and physician names and addresses; hospitals; 
clinics; number of patients on therapy; prescription files; costs of goods 
and supplies; the formula and composition of Cerezyme-TM-; and financial 
records of the party.

               (c)   Exceptions. The restrictions in this Section 4.5 shall 
not apply (i) to any information which is not deemed confidential hereunder, 
or which has not been designated as confidential in the manner specified 
herein, (ii) to any information which was already known to the receiving 
party prior to its disclosure by the other party, as can be proven by 
competent evidence, (iii) to any information

                                       24


which is or becomes public knowledge through no fault or failure of a party 
bound by this Agreement, (iv) to any information which is independently 
developed by an employee of the receiving party who had no access to or 
knowledge of the information disclosed hereunder or (v) to any information 
which was rightfully obtained from a third-party who was not subject to any 
restriction of confidentiality.

               (d)   Covenant. Nova Factor agrees that during the term of 
this Agreement, and for a period of five years following the termination 
hereof, Nova Factor will not undertake to distribute or supply any 
prescription drug for the treatment of Gaucher's disease other than 
Cerezyme-TM-, without the prior written consent of Genzyme. Furthermore, 
during the same period, and whether or not otherwise prohibited by the 
restrictions set out hereinabove, Nova Factor will not disclose to any other 
person or entity, except as may be required by a lending institution that has 
provided a loan to Nova Factor relating to its performance of its obligations 
under this Agreement, or use for purposes of competing directly or indirectly 
with the sale of Cerezyme-TM- by Genzyme: (i) the names of patients or 
hospitals, clinics or physicians or number thereof provided Cerezyme-TM- by 
Nova Factor pursuant to this Agreement, (ii) the volume of Cerezyme-TM- 
supplied to Cerezyme-TM- Customers by Nova Factor, (iii) the addresses of 
patients, (iv) the referral sources of Cerezyme-TM- Customers, (v) Genzyme's 
price for Cerezyme-TM-, or (vi) the service fees, if any, paid to Nova Factor 
pursuant to this Agreement. This provision shall not prohibit disclosure of 
such information in the event that Nova Factor is requested or required by 
law or governmental regulations or by litigation discovery requests, subpoena, 
civil investigative demands or similar processes to disclose such 
information, nor shall it prohibit disclosure and use by Nova Factor of such 
information, if and as necessary, in any litigation between Nova Factor and 
Genzyme.

         4.6   Representations, Warranties and Covenants.

                                       25



         (a)  No Interference. Genzyme represents and warrants to Nova Factor 
that Genzyme has the sole and exclusive right to manufacture and distribute 
Cerezyme-TM- and that the distribution of Cerezyme-TM- and the other 
activities to be performed by Nova Factor hereunder do not, and will not, 
infringe upon or violate the rights of, any other party. Genzyme will 
protect, indemnify and hold Nova Factor harmless from any claims of 
infringement of patent, trademark, mark name or proprietary rights by third 
parties relating to Nova Factor's distribution of Cerezyme-TM-.

          (b)  Government Approval. Genzyme further represents and warrants 
to Nova Factor that all FDA and state approvals and permits required for 
Genzyme's manufacture, sale and distribution of Cerezyme-TM- have been 
obtained and that Genzyme has the corporate authority to authorize Nova 
Factor to sell and distribute Cerezyme-TM-. Genzyme shall comply with all 
applicable FDA and state laws and regulations in the manufacture, design, 
testing, inspection, labeling, warning and instructions for use of 
Cerezyme-TM- material to its performance under this Agreement.

          (c)  Compliance with Laws, Licensure. Nova Factor represents and 
warrants to Genzyme that Nova Factor has materially complied with, shall 
continue to comply with, and nothing in the transactions contemplated by this 
Agreement would cause it not to be in compliance with, all federal and state 
laws, regulations and orders applicable to it and its business as a pharmacy, 
including all pharmacy laws. Nova Factor possesses all federal and state 
governmental licenses and permits material to and necessary in its 
performance of this Agreement. Such licenses and permits are, and shall 
remain, in full force and effect, no violations are or have been recorded in 
respect of any such licenses or permits and no proceeding is pending or, to 
the knowledge of Nova Factor, threatened to revoke or limit any thereof. Nova 
Factor shall promptly notify


                                 26




Genzyme in the event that a proceeding is threatened or commenced to revoke to
limit any such licenses or permits.

          4.7  Trade Names and Trademarks

          (a)  Use of the Name Cerezyme-TM-. Genzyme grants to Nova Factor 
the non-exclusive privilege to use, in connection with the stocking, sale and 
distribution of Cerezyme-TM-, the various trade names, trademarks, service 
marks and several other word and design marks which Genzyme associates with 
Cerezyme-TM-. Nova Factor acknowledges that Genzyme is the exclusive owner of 
the various trade names, trademarks, service marks and several other word and 
design marks which Genzyme uses in connection with Cerezyme-TM- and the sales 
thereof, and that all goodwill associated with such is the property of and 
shall inure to the benefit of Genzyme. Nova Factor agrees that Genzyme has 
the right to control the use or display thereof by Nova Factor. This 
non-exclusive license is a limited license and may be terminated at any time 
by Genzyme. Nova Factor agrees that it will initially display the trademark 
"Cerezyme" as follows: Cerezyme-TM-. After the mark has been federally 
registered and as soon as reasonably practicable after receipt of notice from 
Genzyme, Nova Factor agrees to commence displaying the "Cerezyme" trademark 
as follows: Cerezyme-Registered Trademark-. Nova Factor shall discontinue the 
display or use of any such mark or name, or change the manner in which any 
such name or mark is displayed or used, upon request by Genzyme. Nova Factor 
further agrees that:

               (i)  No such name or mark will be used in such a manner that 
          is may become a generic word, causing a loss of its protected status
          as such;

              (ii)  Nova Factor shall not use such names or marks, or any 
          variant thereof, as the whole or any part of its title or the name 
          of


                                 27




          its business, except upon Genzyme's express written consent to      
          such use;

             (iii)  Nova Factor shall not use such names or marks in any 
          manner in connection with an effort to sell goods of others, 
          whether or not such goods are competitive with Cerezyme-TM-, and 
          shall not use such names or marks as part of its business name;

              (iv)  Nova Factor shall not use, or allow the use of, any name 
          or mark which is likely to cause confusion, mistake or deception 
          with respect to any of the trade names or trademarks of Genzyme; 
          and

               (v)  Nova Factor shall not assert, acquire or attempt to 
          acquire any rights or interest in or to, or consent or assist 
          others in contesting, said names or marks of Genzyme.

Upon Termination of this Agreement, Nova Factor shall discontinue any and 
all use of Genzyme's trademarks, trade names and any other 
identification with Genzyme and shall avoid any statement or 
implication that it is a distributor of Cerezyme-TM-.

          (b)  Use of the Name Nova Factor-Registered Trademark-  The parties 
          recognize that Nova Factor-Registered Trademark- is registered 
          trademark, and Nova Factor hereby grants to Genzyme the 
          non-exclusive privilege to use, in connection with the stocking and 
          sale of Cerezyme-TM- the various trade names, trademarks, service 
          marks and the several other word and design marks which are 
          associated with Nova Factor-Registered Trademark-. Genzyme 
          acknowledges that Nova Factor is the exclusive owner of the various 
          trade names, trademarks, service marks and the several other word 
          and design marks which are used in connection with the name Nova 
          Factor-Registered Trademark and that all good will associated with 
          such is the property of and shall inure to the benefit of Nova 
          Factor. Genzyme agrees that Nova Factor has the right to control the 
          use or display thereof by Genzyme. This non-exclusive license is a 
          limited license and may be terminated at any time by Nova Factor. 
          Genzyme shall discontinue the display or use of any such

                                 28



name or mark, or change the manner in which any such name or mark is 
displayed or used, upon request by Nova Factor. Genzyme further agrees that:

               (i)  No such name or mark shall be used in such a manner that 
          it may become a generic word, causing the loss of its protected 
          status as such;

              (ii)  Genzyme shall not use such names or marks, or any variant 
          thereof, as the whole or any part of its title or the name of its 
          business, except upon Nova Factor's express written consent to such 
          use;

             (iii)  Genzyme shall not use such names or marks in any manner 
          in connection with an effort to sell goods of others and shall not 
          use such names or marks as part of its business name;

              (iv)  Genzyme shall not use, or allow the use of, any name or 
          mark which is likely to cause confusion, mistake or deception with 
          respect to any of the trade names or trademarks of Nova Factor; and

              (v)  Genzyme shall not assert, acquire or attempt to acquire 
          any rights or interest in or to, or context or assist others in 
          contesting, the names or marks of Nova Factor.

Upon termination of this Agreement, Genzyme shall discontinue any and all use 
of Nova Factor's trademarks, trade names and any other identification with 
Nova Factor, and shall avoid any statement or implication that it is 
affiliated with Nova Factor.

          4.8  Service to Other Businesses. Genzyme acknowledges that Nova 
Factor offers it services to other businesses, and Genzyme agrees that no 
provision contained herein shall restrict or prohibit Nova Factor from 
providing services to others in addition to Genzyme as long as the 
performance of said services does not


                                 29




violate the restrictions st out in Section 4.5 hereof, or interfere with the 
performance of Nova Factor's obligations hereunder.

          4.9  Records. To the extent required by Section 1861(b)(1)(I) of 
the Social Security Act, Nova Factor shall, upon proper request, allow the 
United States Department of Health and Human Services, the Comptroller 
General of the United States and their duly authorized representatives, 
access to this Agreement and to all books, documents and records necessary to 
verify the nature and extent of the costs of the services provided by Nova 
Factor under this Agreement at any time during the term of this Agreement 
and for an additional period of four (4) years following the last date 
services are furnished under this Agreement.

         4.10  Specific Performance. The parties acknowledge that violation 
of Sections 4.5 and 4.7 hereof could cause irreparable damage to the party 
against whom the violation is committed which would not adequately be 
remedied by an action at law for damages. The parties agree that, in the 
event of a breach or threatened breach of either of these sections, the party 
alleging such breach shall be entitled to injunctive relief prohibiting such 
breach or threatened breach in any court of the United States or of any 
state or other political subdivision thereof.

         4.11  Remedies Cumulative. The remedies provided herein shall be 
cumulative and shall not preclude any party from asserting any other rights 
or seeking any other remedies against the other party, or such other party's 
successors or permitted assigns, pursuant to this Agreement, as provided 
under other agreements and as provided by law. Nothing contained herein shall 
preclude a party from seeking equitable relief, where appropriate.

         4.12  Nonassignability and Subcontracting. This Agreement and the 
rights, duties and responsibilities of the parties hereto shall not be 
assigned without the prior expresss written consent of the other party, 
except that no prior consent shall be required in the event of acquisition of 
all or substantially all of the assets of


                                 30




a party by an acquirer. The parties to this Agreement acknowledge that for a 
limited period of time, it may be necessary for Nova Factor to arrange for 
the performance of certain of its obligations under this Agreement by a third 
party pursuant to an agreement between Nova Factor and such third party. Nova 
Factor shall not enter into such agreement without the prior written consent 
of Genzyme, which shall not be unreasonably withheld, provided that Nova 
Factor may enter into such an agreement with PharmaThera, Inc. without the 
consent of Genzyme.

         4.13  Applicable Law. This Agreement shall be construed in 
accordance with the laws of the State of Tennessee (excluding the choice of 
law rules thereof), and the laws of the State of Tennessee shall govern the 
rights, duties, liabilities and responsibilities created hereunder.

         4.14  Headings. All headings used herein are for ease of reference 
only and shall in no way be construed as interpreting, decreasing or 
enlarging the provisions of this Agreement.

         4.15  Effect. Subject to any provisions hereof restricting 
assignment, this Agreement shall be binding upon and shall inure to the 
benefit of the parties hereto, their successors, administrators, trustees and 
permitted assigns.

         4.16  Modification. This Agreement and the Security Agreement 
constitute the entire agreement and understanding between the parties hereto 
in respect to the transactions contemplated herein and supersede all prior 
written or oral agreements, arrangements and understanding relating to the 
subject matter hereof. This Agreement may be amended, changed or modified 
only with the written consent of both parties.

         4.17  Notices. All notices, demands, request, consents, reports, 
approvals or other communications which may be or are required to be given 
served or sent pursuant to this Agreement shall be in writing and shall be 
hand delivered, or mailed by first class, registered or certified mail, 
return receipt


                                 31




requested, postage prepaid, or transmitted by telegram, facsimile or by 
overnight courier addressed to the party at its business address and to the 
attention of the individual set out following the signatures of the parties 
on the last page of this Agreement. Each party may designate by notice in 
writing a different person, or new address, to which any notice, demand, 
request, consent, report, approval or other communication may thereafter be 
given, served or sent. Each notice, demand, request, consent, report, 
approval or other communication mailed in the manner described above or 
delivered to a telegraph company or to an overnight courier, or by facsimile 
transmission, shall be deemed sufficiently given, served, sent or received 
for all purposes at such time as it is delivered to the addressee (with the 
return receipt or delivery receipt or machine report, in the case of 
facsimile transmission, being deemed conclusive evidence of such delivery) or 
at such time as delivery is refused by the addressee upon presentation.

         4.18  Waivers. No waiver of the breach of any provision of this 
Agreement shall be deemed a waiver of any other breach of or default under 
the same or any other provision hereof, nor will any waiver constitute a 
continuing waiver. No term or provision of this Agreement shall be waived 
except by a written instrument executed by a duly authorized officer of the 
waiving party hereto and no course of dealing, act or omission to act shall 
operate as a waiver of any right, power or privilege granted to a party 
hereunder.

         4.19  Accreditation Standards. The services provided hereunder are 
designed to meet the applicable requirements stated in PH.1 through PH.11.3 
of the Standards for the Accreditation of Home Care-Pharmaceutical Services 
of the Joint Commission on Accreditation of Healthcare Organizations 
("JCAHO"). In the performance of this Agreement the parties shall conform to 
the policies, standards and requirements of JCAHO, to the extent applicable.


                                 32




         4.20  Severability. If any one or more of the provisions of this 
Agreement shall for any reason be held illegal or invalid, such illegality or 
invalidity shall not affect any other provision of this Agreement and this 
Agreement shall be enforced as if such illegal or invalid provision had not 
been contained herein.


                                 33



     IN WITNESS WHEREOF, the undersigned parties hereto have caused this 
Agreement to be executed as of the day and year first above written.

                                  GENZYME CORPORATION



                                  By:    /s/ illegible
                                         -------------------------
                                  Title: President Therapeutics
                                         ----------------------

                                  Address: One Kendall Square
                                           Cambridge, Massachusetts  02139
                                           Attention: William Aliski



                                  NOVA FACTOR, INC.



                                  BY:    Randy Grow
                                         ------------------------
                                  Title: President
                                         ---------------------
                                  Address: Suite 114
                                           1785 Nonconnah Blvd.
                                           Memphis, Tennessee  38132
                                           Attention: Randy Grow


                                 34




                                  EXHIBIT A

                             SECURITY AGREEMENT



     THIS SECURITY AGREEMENT (the "Security Agreement") is made as of the 30th 
day of September, 1994 by and between NOVA FACTOR, INC., a Tennessee 
corporation ("Nova Factor") and GENZYME CORPORATION, a Delaware corporation 
("Secured Party").


                                  RECITALS:


     WHEREAS, Nova Factor and Secured Party have entered into a certain 
Distribution Agreement dated the date hereof (the "Distribution Agreement") 
pursuant to which Secured Party has agreed to sell to Nova Factor and Nova 
Factor has agreed to purchase from Secured Party quantities of the 
prescription drug known as Cerezyme-TM- on the terms and conditions set forth 
therein; and

     WHEREAS, in order to secure (i) the amounts payable to Secured Party 
under Section 3.2(c)of the Distribution Agreement, (ii) the fulfillment of 
the other obligations of Nova Factor under the Distribution Agreement and 
(iii) the fulfillment of the obligations of Nova Factor hereunder 
(collectively, the "Secured Obligations"), Nova Factor is required to enter 
into this Security Agreement and to grant to Secured Party a security 
interest in the Collateral (as hereinafter defined).

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

     1.   SECURITY INTEREST.

     1.1  COLLATERAL. As security for the Secured Obligations, Nova Factor 
hereby grants to Secured Party a security interest in and lien on, and 
assigns and pledges to Secured Party, all of the following (the "Collateral"):

          (a) all Cerezyme-TM- sold by Secured Party to Nova Factor from time 
to time pursuant to Article III of the Distribution Agreement, which 
Cerezyme-TM- shall be held for sale by Nova Factor to third parties in 
accordance with the terms of the Distribution Agreement (the "Inventory");




          (b) all accounts, chattel paper, instruments and general 
intangibles (as such terms are defined in Article 9 of the Uniform Commercial 
Code as in effect from time to time in the State of Tennessee), accounts 
receivable and other obligations of any kind, whether or not evidenced by an 
instrument or chattel paper (collectively, the "Accounts") of Nova Factor 
representing or arising from the sale of Cerezyme-TM- by Nova Factor from the 
Inventory; and

          (c) any and all additions to any of the foregoing, and any and all 
replacements, products and proceeds (including insurance proceeds) of any of 
the foregoing.

     1.2  RIGHT OF SECURED PARTY TO PAY TAXES OR COSTS RELATING TO 
COLLATERAL. Secured Party shall have the right, but not the obligation, to 
pay any taxes or levies on the Collateral or any costs to preserve the 
Collateral, which payment shall constitute a part of the Secured Obligations; 
provided, however, that no taxes payable by Secured Party pursuant to the 
Distribution Agreement shall be deemed part of the Secured Obligations.

     1.3  FINANCING STATEMENTS. At the request of Secured Party, Nova Factor 
will promptly join with Secured Party in executing financial statements, 
continuation statements, assignments, certificates and other documents with 
respect to the Collateral pursuant to the Uniform Commercial Code and 
otherwise as may be necessary to enable Secured Party to perfect or from time 
to time continue the security interests granted hereby, including without 
limitation such financing statements, continuation statements, certificates 
and other documents as may be necessary to perfect a security interest in any 
Cerezyme-TM- acquired by Nova Factor subsequent to the date hereof pursuant 
to the terms of the Distribution Agreement or in any replacements or proceeds 
thereof, in form satisfactory to Secured Party, and Secured Party will pay 
the cost of filing the same in all public offices wherever Secured Party 
deems filing to be necessary or desirable. Nova Factor grants Secured Party 
the right, at Secured Party's option, to file any or all such financing 
statements, continuation statements and other documents pursuant to the 
Uniform Commercial Code and otherwise, without Nova Factor's signature, and 
irrevocably appoints Secured Party as Nova Factor's attorney in fact to 
execute any such statements and documents in Nova Factor's name and to 
perform all other acts which Secured Party reasonably deems appropriate to 
perfect and continue the security interests conferred by this Security 
Agreement.

     1.4  INJURY TO COLLATERAL: STORAGE OF INVENTORY. No injury to, or loss or 
destruction of, the Collateral shall relieve Nova Factor of any of the 
Secured Obligations. Nova Factor shall handle and store the Inventory in the 
manner required by the Distribution Agreement except as otherwise provided 
herein.


                                   -2-



     1.5  COLLECTING AND SERVICING ACCOUNTS. Nova Factor is authorized to 
collect and service the Accounts, provided that Secured Party may, without 
cause or notice, upon the default of Nova Factor hereunder, terminate such 
authority at any time.

     1.6  NOTICE OF PAST DUE ACCOUNTS. Nova Factor will promptly notify 
Secured Party if any Account owned by it in excess of Fifty Thousand Dollars 
($50,000) is not paid within one hundred and twenty (120) days after the 
date of shipment by Nova Factor of the Inventory to which such Account 
relates, or if an Account debtor thereof disputes liability, exercises a right 
of set-off or counterclaim, becomes insolvent, fails, or goes out of business.

     2.   REPRESENTATIONS, WARRANTIES, AGREEMENTS AND COVENANTS OF NOVA 
FACTOR. Nova Factor represents, warrants, agrees and covenants that:

     2.1  Unless Secured Party shall otherwise agree in writing, Nova Factor 
will not grant or permit to exist, nor shall there exist, any security 
interest in, or any lien, attachment, levy or encumbrance upon, any of the 
Collateral, except for the security interest granted to Secured Party 
hereunder and except for any encumbrance (as hereafter defined) in existence 
at the time Nova Factor acquired or acquires the Collateral that has been 
subordinated to the lien created by this Security Agreement and has been 
approved, in writing by Secured Party, or, subject to the approval of Secured 
Party, which shall not be unreasonably withheld, any lien credited subsequent 
to the date hereof that is subordinate to the lien of Secured Party. Nova 
Factor has not signed or filed or authorized the signing or filing of, a 
financing statement (other than one naming Secured Party as the secured 
party) under the Uniform Commercial Code of any jurisdiction with respect to 
the Collateral or any portion thereof, except for financing statements naming 
First Tennessee Bank National Association as secured party, if agreed to in 
writing by Secured Party. For the purposes of this Section 2, "encumbrance" 
shall mean any mortgage, deed of trust, pledge, security interest, 
hypothecation, assignment, assigned deposit, arrangement, encroachment, 
claim, option, reservation, right of way, easement, covenant, lease, purchase 
right, condition, restriction, charge or defect of any kind, or any 
preference, priority or security agreement or other preferential arrangement 
of any kind or nature whatsoever (including, without limitation, any 
conditional sale or title retention agreement, any capitalized lease 
obligation having substantially the same economic effect as any of the 
foregoing, and the filing of any financing statement under the Uniform 
Commercial Code or comparable law of any jurisdiction).

     2.2  Nova Factor is a corporation duly organized, validly existing and 
in good standing under the laws of the State of Tennessee and has the full 
and unrestricted power and authority to enter into and perform the terms of 
this Security Agreement and the transactions contemplated hereby. The 
execution,


                                 -3-



delivery and performance of this Security Agreement have been duly authorized 
by all necessary corporate action of Nova Factor and this Security Agreement 
has been duly executed on behalf of Nova Factor.

     2.3  This Security Agreement constitutes a legal, valid and binding 
obligation of Nova Factor, enforceable against Nova Factor in accordance with 
its terms, except to the extent enforceability may be limited by bankruptcy, 
insolvency or other similar laws affecting the rights of creditors generally. 
The execution, delivery, and performance of this Security Agreement and of 
all other instruments or agreements executed in connection herewith will not 
(i) violate, conflict with, or constitute a default under any law, 
regulation, order or any other requirement of any governmental authority or 
arbitrator, any terms of the Articles or Certificate of Incorporation or 
bylaws of Nova Factor, or any contract, agreement or other arrangement 
binding upon or affecting Nova Factor or any of its properties, (ii) result 
in the creation, imposition or acceleration of any indebtedness of any nature 
upon, or with respect to, Nova Factor or any of its properties, (iii) have a 
material adverse effect on the conduct of Nova Factor's business as it is now 
being conducted and as proposed to be conducted while this Security Agreement 
is in effect, or (iv) otherwise impair the value of the security interests 
granted to Secured Party hereunder.

     2.4 Nova Factor will (i) execute and deliver any and all documents, or 
cause the execution and delivery of any and all documents, reasonably 
necessary for Secured Party to create, perfect, preserve, validate or 
otherwise protect its security interest in the Collateral; (ii) maintain, or 
cause to be maintained, at all times, Secured Party's security interest in 
the Collateral; (iii) after the occurrence of an Event of Default hereunder, 
immediately upon learning thereof, report to Secured Party any reclamation, 
return or repossession of any of their Inventory, any claim or dispute 
asserted by any debtor or other obligor of Nova Factor, and any other matters 
affecting the value or enforceability or collectibility of any of the 
Collateral; (iv) after the occurrence of an Event of Default hereunder, 
defend the Collateral against all claims and demands of all persons at any 
time claiming the same or any interest therein adverse to Secured Party and 
pay all costs and expenses (including attorneys' fees and expenses) incurred 
in connection with such defense; and (v) at Nova Factor's sole cost and 
expense (including attorneys' fees and expenses), settle any and all such 
claims and disputes referenced in paragraph 2.4(iv) above and indemnify and 
protect Secured Party against any liability, loss or expense arising 
therefrom or out of any such reclamation, return (except as otherwise 
provided in Section 3.7(d) of the Distribution Agreement) or repossession of 
any of the Collateral; provided, however, if Secured Party shall so elect, it 
shall have the right following the occurrence of an Event of Default 
hereunder to settle, compromise, adjust, or litigate all claims or disputes 
directly with the debtor or other obligor of Nova Factor upon such reasonable 
terms and conditions as Secured Party deems advisable, and to charge all 
costs and expenses thereof (including

                                     -4-




attorneys' fees and expenses) to Nova Factor's account and to add them to the 
Secured Obligations.

     2.5 Nova Factor's principal place of business and its chief executive 
office are located at the address for Nova Factor set forth in Section 10 
hereof, and Nova Factor shall not change such location unless Nova Factor 
shall have provided to Secured Party at least (30) days' prior notice of any 
changes in the location of Nova Factor's principal place of business and Nova 
Factor's chief executive office. Notwithstanding anything in the Distribution 
Agreement to the contrary, the Inventory shall be located at Nova Factor's 
warehouse in Memphis, Tennessee and the records and books of account relating 
to the Collateral shall be located at Nova Factor's chief executive office, 
and Nova Factor shall not change such locations unless with the prior written 
consent of Secured Party given no less than thirty (30) days in advance of 
any relocation of the Inventory or the books and records.

     2.6 Nova Factor will (i) promptly notify Secured Party in writing of any 
compromise, settlement or adjustment with respect to an Account; (ii) 
maintain accurate and complete records of the Accounts and make the same 
available to Secured Party at reasonable times during normal business hours 
after receipt of notice from Secured Party, except after the occurrence of an 
Event of Default in which case no notice shall be required; (iii) if 
requested by Secured Party and desirable for the protection of Secured 
Party's interest in the Collateral, stamp, in form and manner satisfactory to 
Secured Party, its accounts receivable ledger and other books and records 
pertaining to the Accounts, with an appropriate reference to the security 
interest of Secured Party in the Accounts; (iv) upon Secured Party's 
reasonable request, furnish Secured Party original or other papers relating 
to the sale of Cerazyme-TM- which created any Account; and (v) promptly 
notify Secured Party in writing of the return or rejection of any 
Cerezyme-TM- represented by the Accounts.

      2.7 For any transaction governed by Article II of the Distribution 
Agreement, from time to time as Secured Party may require, Nova Factor will 
deliver to Secured Party schedules of all outstanding Accounts as Secured 
Party may reasonably request. Such schedules shall be in form satisfactory to 
Secured Party and shall show the age of such Accounts in intervals of not more 
than 30 days, and contain such other information and be accompanied by such 
reasonably supporting documents as Secured Party may from time to time 
reasonably prescribe. Nova Factor shall also deliver to Secured Party copies 
of Nova Factor's invoices, evidences of shipment or delivery and such other 
schedules and information as Secured Party may reasonably request. For any 
transaction governed by Article III of the Distribution Agreement, Nova 
Factor shall prepare, maintain and deliver the records and books and other 
materials in the manner provided in Section 3.11 of the Distribution 
Agreement. The items to be provided

                                      -5-


under this Section are to be prepared and delivered to Secured Party from 
time to time solely for its convenience in maintaining records of the 
Collateral and Nova Factor's failure to give any of such items to Secured 
Party shall not affect, terminate, modify or otherwise limit Secured Party's 
security interest granted herein.

     2.8 Nova Factor will (i) sell or dispose of the Inventory only in 
accordance with the terms of the Distribution Agreement or otherwise in the 
ordinary course of business; and (ii) immediately notify Secured Party at 
least thirty (30) days prior to any change in location of any of the 
Inventory other than in the event of sales to third parties in accordance 
with the Distribution Agreement or in the ordinary course of business and, 
prior to any such change, execute and deliver to Secured Party such financing 
statements satisfactory to Secured Party as Secured Party may request.

     2.9 [Reserved]

     2.10 Except to the extent Section 3.3(d) of the Distribution Agreement 
applies, Nova Factor shall insure all of the Inventory for its replacement 
(i.e., market) value against fire, theft, loss or destruction, and such other 
risks as are customarily insured against by prudent persons in a similar line 
of business, with an insurance carrier qualified to do business in the State 
of Tennessee (or such other place as Secured Party shall authorize). Nova 
Factor shall provide Secured Party with certificates of such insurance upon 
request.

     3. EVENTS OF DEFAULT. The occurrence of one or more of the following 
events shall constitute an Event of Default hereunder (each, an "Event of 
Default"):

          (i) The failure of Nova Factor to observe or perform any term, 
     condition, covenant or agreement contained in this Security Agreement or 
     in the Distribution Agreement and the continuance of such failure for 
     thirty (30) days after the receipt of written notice thereof in the case 
     of such failure. Late payment by Nova Factor to Secured Party under the 
     terms of Section 3.2(c) of the Distribution Agreement shall not 
     constitute an Event of Default but shall cause the late payment charges 
     to come into effect;

          (ii) The breach of any representation, warranty, covenant or 
     agreement by Nova Factor made in Section 2 hereof and continuance of 
     such breach for thirty (30) days after the receipt of written notice 
     thereof by Nova Factor;

          (iii) [Reserved]


                                      -6-



    (iv)  (a) The entry of a decree or order for relief of Nova Factor by a 
              court of competent jurisdiction in any involuntary case 
              involving Nova Factor under any bankruptcy, insolvency, or 
              other similar law now or hereafter in effect, or the 
              appointment of a receiver, liquidator, assignee, custodian, 
              trustee, sequestrator or other similar agent for Nova Factor 
              or for any substantial part of Nova Factor's assets or 
              property, or the order of the winding up or liquidation of 
              Nova Factor's affairs, or the taking of any action by any 
              creditor (other than Secured Party) of Nova Factor preparatory 
              to or for the purpose of commencing any such involuntary case, 
              appointment, winding-up or liquidation and such decree or 
              order or other such action shall be entered and continue 
              unstayed and in effect for a period of thirty (30) days; or

          (b) The commencement by Nova Factor of a voluntary case under any 
              bankruptcy, insolvency or other similar law now or hereafter 
              in effect, or the consent by Nova Factor to the entry of an 
              order for relief in an involuntary case under any such law or 
              to the appointment of or taking possession by a receiver, 
              liquidator, assignee, trustee, custodian, sequestrator or 
              other similar agent for Nova Factor or for any substantial 
              part of Nova Factor's assets or property, or the making by 
              Nova Factor of any general assignment for the benefit of 
              creditors, or the taking by Nova Factor of any action 
              preparatory to or otherwise in furtherance of any of the 
              foregoing, or the failure of Nova Factor generally to pay its 
              debts as such debts come due; or

     (v)  The occurrence of an Event of Default under that certain Loan 
Agreement dated December 3, 1998 between First Tennessee Bank National 
Association and PharmaThera, Inc., that certain Amended and Restated 
Promissory Note dated as of July 1, 1994 from PharmaThera, Inc. and Nova 
Factor to First Tennessee Bank National Association, that certain Amended and 
Restated Security Agreement dated as of July 1, 1994 between PharmaThera, 
Inc., Nova Factor and First Tennessee Bank National Association or the 
default by Nova Factor under any other note, security agreement or other 
document or instrument that creates a lien on the Collateral or evidence the 
obligation of Nova Factor to repay borrowed money.

                              - 7 -



     4. REMEDIES. The rights and remedies, privileges, obligations, and 
duties of Secured Party and Nova Factor with respect to this Security 
Agreement and the security interest of Secured Party shall be as set forth in 
the Uniform Commercial Code of the State of Tennessee (the "Code"), and in 
addition thereto, as set forth herein. Upon the occurrence of any Event of 
Default, Secured Party shall have the right (a) to declare all of the Secured 
Obligations to be immediately due and payable, whereupon all such Secured 
Obligations shall become immediately due and payable without presentment, 
demand, protest or further notice of any kind, all of which are hereby 
expressly waived by Nova Factor, anything contained herein to the contrary 
notwithstanding; and (b) to exercise any one or more of the rights and 
remedies exercisable by a secured party under the Code (subject to any rights 
of Nova Factor to redeem the Collateral provided therein) or under any other 
applicable law. Upon the occurrence of any Event of Default, and without 
limiting the generality of the foregoing, Secured Party shall have the right 
to sell the Collateral at public or private sale. All reasonable attorneys' 
fees and disbursements and all other costs, charges, premiums and other 
expenses incurred in connection with any such sale shall be charged against 
and deducted from the proceeds thereof, with the balance, if any, applied in 
reduction of the Secured Obligations of Nova Factor to Secured Party, and in 
the event there is a deficiency, said deficiency shall be payable forthwith 
by Nova Factor to Secured Party (except as otherwise provided in Section 3.2 
of the Distribution Agreement). Notice of public or private sale, if given, 
shall be sufficiently given for all purposes if published once in any 
newspaper of general circulation distributed in the City of Memphis, 
Tennessee, not less than ten days prior to sale. It is agreed that ten days' 
written notice of any such sale to Nova Factor or any other person shall be 
sufficient for all purposes and is commercially reasonable. Secured Party may 
itself purchase the whole, or any part of the Collateral or any interest 
therein, free from any right of redemption on the part of Nova Factor, which 
right of redemption on the part of Nova Factor is hereby waived and released, 
but only to the extent such waiver and release is permitted by applicable law.

     Secured Party shall not be liable for failure to collect or demand 
payment of, or to protest, or give notice of nonpayment of, the Collateral or 
any part thereof, or for any delay in so doing, nor shall Secured Party be 
under any obligation to foreclose on or sell any Collateral or to take any 
other action whatsoever in regard to the Collateral or any part thereof, 
except that Secured Party hereby agrees to credit against the outstanding 
aggregate invoice price of all Inventory an amount equal to the outstanding 
aggregate invoice price of all properly stored Inventory which is returned by 
Nova Factor to Secured Party in original, sealed packaging and having not 
less than thirty (30) days remaining shelf life.

     5. TRANSFER OF COLLATERAL. Nova Factor shall not sell, lease, transfer, 
assign, mortgage, pledge or otherwise dispose of all or any portion of the

                                      -8-


Collateral except in accordance with the Distribution Agreement or when 
authorized by the Secured Party in writing.


     6. RELEASE OF COLLATERAL. Promptly following payment in full or 
satisfaction of the Secured Obligations, the security interest created 
hereby shall terminate, and Secured Party shall execute and deliver such 
documents as are necessary to release Secured Party's security interest in 
the Collateral, whether such security interest was created hereby or 
otherwise; it being the intention of the parties hereto that, upon payment in 
full or satisfaction of the Secured Obligations, Nova Factor shall hold the 
Collateral free and clear of all liens, claims, charges, security interests, 
mortgages or encumbrances of Secured Party or any assignee or subrogee of 
Secured Party.

     7. BENEFIT; GOVERNING LAW. This Security Agreement shall benefit and 
bind the successors, and permitted assigns of the parties hereto, and shall 
be governed by and construed in accordance with the laws of the State of 
Tennessee (but not including the choice-of-law rules thereof).


     8. WAIVER. No delay or failure on the part of any party hereto in 
exercising any right, power or privilege under this Security Agreement or 
under any other instruments given in connection with or pursuant to this 
Security Agreement shall impair any such right, power or privilege or be 
construed as a waiver or default or any acquiescence therein. No waiver 
shall be valid against any party hereto unless make in writing and signed by 
the party against whom enforcement of such waiver is sought and then only to 
the extent expressly specified therein.

     9. ASSIGNMENT. Nova Factor shall not assign this Security Agreement, in 
whole or in part, whether by operation of law or otherwise, without the prior 
written consent of Secured Party.

    10. NOTICES. All notices, demands, requests, or other communications 
which may be or are required to be given, served, or sent by any party to any 
other party pursuant to this Security Agreement shall be in writing and shall 
be mailed by first-class, registered or certified mail, return receipt 
requested, postage prepaid, or transmitted by hand delivery, or telegram, 
addressed as follows:

     If to Nova Factor:

            Nova Factor, Inc.
            Suite 115
            1785 Nonconnah Boulevard
            Memphis, Tennessee 38132
            Attention: Randy Grow



                                     -9-



         with a copy (which shall not constitute notice) to:

              Armstrong Allen Prewitt Gentry
                Johnston & Holmes
              1900 One Commerce Square
              Memphis, Tennessee 88108-2568
              Attention: Thomas W. Bell, Jr., Esq.

         If to Secured Party:

              Genzyme Corporation
              One Kendall Square
              Cambridge, Massachusetts 02139-1562
              Attention: William Aliski

         with a copy (which shall not constitute notice) to:

              Hogan & Hartson LLP
              555 Thirteenth Street, N.W.
              Washington, D.C. 20004
              Attention: Isabel P. Dunst, Esq.

Each party may designate by notice in writing a new address to which any 
notice, demand, request or communication may thereafter be so given, served 
or sent. Each notice, demand, request or communication which shall be mailed, 
delivered or transmitted in the manner described above shall be deemed 
sufficiently given, served, sent and received for all purposes at such time 
as it is delivered to the addressee (with the return receipt, the delivery 
receipt or the affidavit of messenger being deemed conclusive evidence of 
such delivery) or at such time as delivery is refused by the addressee upon 
presentation.

          11.  ENTIRE AGREEMENT.  This Security Agreement and the other 
instruments and documents referred to herein or delivered pursuant hereto, 
represent the entire understanding of the parties hereto, supersede all other 
and prior memoranda and agreements between the parties and their affiliates 
and may not be modified or amended, except by a written instrument executed 
by each of the parties hereto designating specifically the terms and 
provisions so modified and amended.

          12.  SEVERABILITY.  If any part or any provision of this Security 
Agreement shall be invalid or unenforceable under applicable law, said part 
or provision shall be ineffective to the extent of such invalidity or 
unenforceable only, without in any way affecting the remaining parts of such 
provisions or the remaining provisions of this Security Agreement, which 
shall be construed as if such invalid parts or provisions had not been 
inserted.

                                     -10-


     13. COUNTERPARTS. This Security Agreement may be executed in separate 
counterparts, none of which need contain the signatures of all parties, each 
of which is deemed to be an original, and all of which taken together 
constitute one and the same instrument. It shall not be necessary in making 
proof of this Security Agreement to produce or account for more than the 
number of counterparts containing the respective signatures of, or on behalf 
of, all the parties hereto.

    IN WITNESS WHEREOF, the undersigned have caused this Security Agreement 
to be executed as of the date first above written.

                                       NOVA FACTOR, INC.

                                       By: /s/ Randy Grow
                                          ------------------------------------

                                       Its: President
                                           -----------------------------------

                                       GENZYME CORPORATION

                                       By: /s/ illegible
                                          ------------------------------------
                                       
                                       Its: President Therapeutics
                                          ------------------------------------





                                     -11-




                              Exhibit B

                           Section 3.2(b)
                   Basis for Calculating Inventory


                                  *



* Omitted information is the subject of a request for confidential treatment 
  pursuant to Rule 406 under the Securities Act of 1933 and has been filed 
  separately with the Securities Exchange Commission.