MENTOR CORP /MN/
10-Q, 1998-08-14
ORTHOPEDIC, PROSTHETIC & SURGICAL APPLIANCES & SUPPLIES
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13

                   SECURITIES AND EXCHANGE COMMISSION
                             Washington D.C.
                                    
                                FORM 10-Q
                                    
                                    
               Quarterly Report Under Section 13 or 15(d)
                 Of the Securities Exchange Act of 1934
                                    
                                    
                     For Quarter Ended June 30, 1998
                     Commission File Number  0-7955


                           Mentor Corporation
         (Exact name of registrant as specified in its charter)


     Minnesota                        41-0950791
(State of Incorporation) (I.R.S. Employer Identification Number)


5425 Hollister Avenue, Santa Barbara, California       93111
    (Address of Principal Executive Offices)        (Zip Code)


Registrant's Telephone Number:     (805) 681-6000



Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by section 13 of 15(d) of the Securities Exchange
Act of 1934 during the preceding 12 months or for such shorter period
that the registrant was required to file such reports and (2) has been
subject to such filing requirements for the past 90 days.

                    Yes                 No

The number of shares outstanding for each of the Issuer's classes of
common stock as of August 12, 1998 was:

          Common stock, $.10 par value 24,788,789 shares

                           Mentor Corporation
                                    
                                  INDEX

Part I.  Financial Information

     Item 1.  Financial Statements (unaudited)

          Condensed Consolidated Statements of Financial
               Position -- June 30, 1998 and March 31, 1998
          Consolidated Statements of Income -- Three Months
               Ended June 30, 1998 and 1997
          Condensed Consolidated Statements of Cash Flows --
               Three Months Ended June 30, 1998 and 1997
          Notes to Condensed Consolidated Financial Statements--
               June 30, 1998

     Item 2.  Management's Discussion and Analysis of Results of
               Operations and Financial Condition

Part II. Other Information

     Item 1.  Legal Proceedings
     Item 2.  Changes in Securities
     Item 3.  Defaults upon Senior Securities
     Item 4.  Submission of Matters to a Vote of Security Holders
     Item 5.  Other Information
     Item 6.  Exhibits and Reports on Form 8-K

List of Exhibits

     11.  Statement Regarding Computation of Per Share Earnings
                           Mentor Corporation
         Condensed Consolidated Statements of Financial Position
                    June 30, 1998 and March 31, 1998
                               (Unaudited)



                                       June 30,         March 31,
(dollars in thousands)                   1998             1998
                                                    
ASSETS                                                            
Current assets:                                                   
  Cash and marketable securities     $   34,732        $   27,937
  Accounts receivable, net               40,853            40,209
  Inventories                            46,589            44,632
  Deferred income taxes                   6,619             6,619
  Other                                   4,094             8,144
                                                       
          Total current assets          132,887           127,541
                                                                  
Property, plant and equipment,                                    
  net of accumulated depreciation        41,992            39,423
Other assets:                                                     
  Patents, licenses and trademarks                     
    net of accumulated amortization       5,667            5,530
  Goodwill, net of accumulated                         
    amortization                         13,501           13,619
  Long term marketable securities                      
    and investment                       13,575           14,806
  Other assets                                                454
                                         32,743            34,409
Total assets                         $  207,622        $  201,373


See Notes to Condensed Consolidated Financial Statements

                           Mentor Corporation
         Condensed Consolidated Statements of Financial Position
                    June 30, 1998 and March 31, 1998
                               (Unaudited)



                                        June 30,        March 31,
(dollars in thousands)                    1998             1998
                                                                  
LIABILITIES AND SHAREHOLDERS' EQUITY                              
Current liabilities:                                              
  Accounts payable                    $    7,018        $    6,903
  Accrued compensation                     6,097             8,742
  Income taxes payable                     4,610             1,325
  Dividends payable                          634               634
  Sales returns                            5,941             5,961
  Self-insured retention                   3,619             3,580
  Accrued royalties                        1,414             1,598
  Other accrued liabilities                3,787             3,841
  Short-term borrowings and current                     
    portion of long-term debt                                  50
                                                        
          Total current liabilities       33,120            32,634
                                                        
Long-term deferred taxes                   3,341             4,054
                                                        
Shareholders' equity:                                  
  Common shares, $.10 par value:                        
    Authorized-- 50,000,000 shares                      
    Issued and outstanding:                             
      25,046,790 shares at                              
        June 30,1998
      25,020,690 shares at                              
        March 31, 1998                     2,504            2,502
  Capital in excess of par                35,473            35,189
  Cummulative transalation                             
    adjustment                            (1,333)          (1,404)
  Unrealized gains on investments          3,900            5,000
  Retained earnings                      130,617           123,398
                                         171,161           164,685
                                                                  
Total liabilities and shareholders'                     
equity                                $  207,622       $  201,373


See Notes to Condensed Consolidated Financial Statements
                           Mentor Corporation
                    Consolidated Statements of Income
                Three Months Ended June 30, 1998 and 1997
                               (Unaudited)
                                    
                                    
(in thousands, except per share                              
data)                                    1998              1997
                                                                   
Net sales                            $   57,018        $   55,291
Costs and expenses:                                    
  Cost of sales                          19,165            18,275
  Selling, general and                                 
     administrative                      22,787           20,309
  Research and development                3,679             5,109
                                         45,631            43,693
                                                       
Operating income                         11,387            11,598
  Interest expense                          (10)              (11)
  Interest income                           383               324
  Other income (expense)                    (59)              (70)
Income before income taxes               11,701            11,841
  Income taxes                            3,862             4,038
                                                       
Net income                           $    7,839        $    7,803
                                                                   
Basic earnings per share             $      .31       $      .31
Diluted earnings per share           $      .30       $      .30
                                    
             See notes to consolidated financial statements
                           Mentor Corporation
             Condensed Consolidated Statements of Cash Flows
                Three Months Ended June 30, 1998 and 1997
                               (Unaudited)
                                    

(in thousands)                           1998              1997
                                                                   
Cash flows from operating activities $   12,240       $   13,935
                                                      
Cash flows from investing                             
activities:
                                                      
  Purchase of property, equipment,                    
    and intangibles                      (5,112)          (3,071)
  Investment in Marketing Partner                         (2,006)
                                         (5,112)          (5,077)
                                                      
Cash flows from financing                             
activities:
  Exercise of stock options                 287              890
  Dividends paid                           (620)            (624)
  Reduction of long-term debt                                 (9)
  Repurchase of common stock                              (1,519)
                                           (333)          (1,262)
Increase (decrease) in cash, cash                     
  equivalents, and marketable                         
  securities                              6,795            7,596
                                                                   
Cash at beginning of period              27,937           27,808
                                                      
Cash at end of period                $   34,732       $   35,404

See notes to consolidated financial statements

                           Mentor Corporation
          Notes to Condensed Consolidated Financial Statements
                              June 30, 1998


Note A

Inventories at June 30, 1998 and March 31, 1998 consisted of:

                            June 30        March 31
                                 (In thousands)

Raw materials            $    13,071    $    12,900
Work in process                7,639          6,682
Finished goods                25,879         25,050
                         $    46,589    $    44,632


Note B

Other assets at June 30, 1998 include the Company's equity investments in
its marketing partners, Intracel Corporation and North American
Scientific, Inc. (NASI).  The Intracel Corporation investment is valued
at cost of $6 million.  In accordance with Financial Accounting Standards
Board (FASB) statement 115 "Accounting of Certain Equity Investments in
Debt and Equity Securities" the North American Scientific investment is
carried at its fair market value of approximately $7.1 million.
Unrealized gains, net of the related tax effect, are accounted for as a
separate component of shareholders' equity.

Note C

In 1997, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 128, "Earnings per Share".  Statement
128 replaced the previously reported primary and fully diluted earnings
per share with basic and diluted earnings per share.  Unlike primary
earnings per share, basic earnings per share excludes any dilutive
effects of options, warrants, and convertible securities.  Diluted
earnings per share is very similar to the previously reported fully
diluted earnings per share.  All earnings per share amounts for all
periods have been restated to conform to Statement 128 requirements.

Note D

The amounts set forth in the accompanying statements are unaudited but,
in the opinion of management, reflect all adjustments (consisting only of
normal accruals) necessary for a fair statement of the results of
operations for the periods presented.  Operating results for the three
months period ended June 30, 1998 are not necessarily indicative of the
results that may be expected for the year ended March 31, 1999.  It is
suggested that the condensed consolidated financial statements included
herein be read in conjunction with the Company's annual report on form 10-
K for the year ended March 31, 1998.

Note E

The Company's three quarterly interim reporting periods are each
approximately thirteen week periods ending on the Friday nearest the end
of the third calendar month.  The fiscal year end remains March 31.  To
facilitate ease of presentation, each interim period is shown as if it
ended on the last day of the appropriate calendar month.  The actual
dates on which each quarter ended are shown below:

                       Fiscal 1999         Fiscal 1998
                                           
First Quarter          June 26, 1998       June 30, 1997
Second Quarter         September 25, 1998  September 26, 1997
Third Quarter          December 25, 1998   January 2, 1998

                           Mentor Corporation
           Management's Discussion and Analysis of Results of
                   Operations and Financial Condition


Except for the historical information contained herein, the matters
discussed in this Management's Discussion are forward-looking statements,
the accuracy of which is necessarily subject to risks and uncertainties.
Actual results may differ significantly from the discussion of such
matters in the forward looking statements.  Potential risks and
uncertainties include, without limitation, those mentioned in this report
and, in particular, the factors described under "Factors That May Affect
Future Results of Operations" in the Company's Annual Report on Form 10-K
for the fiscal year ended March 31, 1998.

RESULTS OF OPERATIONS

Sales

Sales for the three months ended June 30, 1998 increased 3% to $57
million, compared to $55.3 million the prior year.  Growth was
particularly strong in sales of urology products, increasing 13% compared
to a year ago. Disposable products for the management of urinary
incontinence were up 14%.  Adding to urology product sales were two new
products that were introduced in the last year, brachytherapy seeds for
the treatment of prostate cancer, and the Suspend sling for treating
female urinary incontinence.  Sales of penile implants declined 22% from
the previous year, due to competition from a new impotence drug, Viagra.
The combination of ease of use, plus a major advertising campaign from
Pfizer, has generated an unprecedented amount of interest in this new
product.  The Company continues to believe that this interest in treating
impotence bodes well for the long term prospects of penile implant sales,
as Viagra will not work on all patients. However, we may continue to see
weakness in sales in the next few quarters. Plastic surgery products were
flat compared to a year ago, while Ophthalmic products increased 2%.
Increased sales of the MemoryLens, a foldable intraocular lens, helped
offset continued declines in fixed intraocular lenses.

       Sales by Principal Product Line
                               
                  For the Three Months Ended
                           June 30,
                                     Percent
                   1998      1997     Change
                                    
Plastic surgery  $30,404   $31,799     (4%)
General surgery    1,053               N/A
Urology           16,627    14,762     13%
Ophthalmology      8,934     8,730      2%
                 $57,018   $55,291      3%

Cost of Sales

Cost of sales was 33.6% for three months ended June 30, 1998 compared to
33.1% for the same period last year. Included in Cost of Sales this
period was approximately $2 million in proceeds from the Company's
insurance claim related to a fire at its Texas facility in 1997. These
funds were used to offset continuing extra expenses resulting from the
fire and for additional costs related to the ongoing re-validation
efforts at the Texas plant.

In 1996, the Food and Drug Administration ("FDA") issued the Texas
facility a warning letter, citing several inadequacies in the Company's
adherence to FDA Good Manufacturing Practices.  The FDA was specifically
concerned with the method by which the Company had performed its initial
validation of the manufacturing processes in the Texas facility.  The
Company agreed to re-validate the facility, as well as correct the other
items in the warning letter, and in July, 1996, submitted to the FDA a
schedule for completion of these items.  In August 1997, the FDA returned
to the Texas facility to perform a comprehensive GMP compliance audit,
which included reviewing the Company's progress in completing the
remaining items contained in the 1996 warning letter.  While the Company
had completed a substantial amount of items, the re-validation effort had
not been completed within the time frame outlined in the July 1996
schedule.

In May 1998, the Company entered into a voluntary consent decree with the
FDA in relation to the Texas facility.  The agreement requires the
completion of the re-validations of certain of the Company's
manufacturing processes, strengthening of its continuous quality
improvement program, and for the independent audit on overall GMP
compliance under a schedule agreed to by the Company and the FDA.  Mentor
has completed to date those activities called for in the agreement.
Specifically, the Company has selected a GMP expert consultant to conduct
the reviews and audits prescribed by the agreement, and has submitted to
the FDA the results of those reviews and audits, along with Company
responses where appropriate, that were to be conducted in the first 60-
day period.

Should the Company fail to complete the milestones in a timely manner,
the consent decree allows the FDA to order the Company to stop
manufacturing or distributing breast implants, order a recall or take
other corrective actions.  The Company may also be subject to penalties
of $10,000 per day until the task is completed.  While the Company
believes it can continue to meet the milestones set out in the agreement,
which extends through the end of the fiscal year, there can be no
guarantee that such timeframes can actually be met.

Selling, General and Administrative Expenses

Selling, General and Administrative expenses were 40.0% of sales in the
quarter compared to 36.7% in the previous year.  The increase relates
primarily to the Company's efforts in launching several new products,
including the Contour Genesis surgical aspiration system, the MemoryLens,
brachytherapy seeds and the Suspend sling.  The Company is increasing its
marketing and sales staff to accommodate these new products.

Research and Development

Research and development expenses were 6.5% of sales for the quarter,
compared to 9.2% for the prior year.  In the prior year, the Company had
spent funds on the completion of the development of the Contour Genesis,
which was introduced in September 1997.  The Company continues to spend
substantial funds on its premarket approval applications ("PMAAs") for
its saline breast implants, silicone gel filled breast implants, and
penile implants.  The Company is committed to a variety of clinical and
laboratory studies in connection with these products.  The Company
expects to complete the work on its saline filled breast implant PMAAs
and submit the data to the FDA by the end of fiscal 1999.  Other major
studies underway include an alternate filler breast implant and extending
the use of the Contour Genesis to include liposuction.

Interest and Other Income and Expense

Net interest income increased from $313 thousand last year to $373
thousand this year, resulting from higher cash balances.

Income Taxes

The effective rate of corporate income taxes was 33.0% for the quarter,
compared to 34.1% in the same period a year ago.  The decrease results
from higher expected income from our tax-advantaged facility in Puerto
Rico, which makes the MemoryLens.

Net Income

Diluted earnings per share remained the same at $.30 for the three months
ended June 30, 1998 and 1997, as slightly higher sales were offset by
increased expenses.


LIQUIDITY AND CAPITAL RESOURCES

At June 30, 1998, the Company's working capital was $99.8 million
compared to $94.9 million at March 31, 1998.  The Company's working
capital needs were provided from operations.

The Company generated $12.2 million of cash from operations during the
three months ended June 30, 1998, compared to $13.9 million the previous
year.  Higher net income in the current period was offset by reduced
accrued liabilities when compared to the prior year.

The Company anticipates investing approximately $12 million in facilities
and capital equipment in fiscal 1999.  The majority of the expenditures
will be for facility upgrades at the Company's manufacturing facilities
in Texas and Minneapolis, as well as for enhancing the Company's
information technology capabilities.

At the end of fiscal 1998, the Company filed an insurance claim related
to the fire it experienced at its Texas facility.  The claim requested
reimbursement for property damage repair, loss of inventory destroyed by
the fire and business interruption.  In the first quarter of fiscal 1999,
the Company settled its claim with the insurance carrier for a total of
$6 million, of which $1 million had been prepaid to the Company in fiscal
1998.  The Company received the remaining $5 million in the first
quarter.

For the last several years, the Company has paid a quarterly cash
dividend of $.025 per share.  At the indicated rate of $.10 per year, the
aggregate annual dividend would equal approximately $2.5 million.

The Company's Board of Directors has authorized an ongoing stock
repurchase program.  The objectives of the program, among other items,
are to offset the issuance of stock options, provide liquidity to the
market and to reduce the overall number of shares outstanding.
Repurchases are subject to market conditions and cash availability.  In
July 1998, the Board increased the repurchase authorization by 1 million
shares, to a total of 1.8 million, and instructed the Company to increase
its share repurchases.  As a result, during the second quarter of fiscal
1999 the Company has repurchased approximately 450 thousand shares for
consideration of $9.1 million.

The Company's principal source of liquidity at June 30, 1998 consisted of
$34.7 million in cash and marketable securities plus $15 million
available under its line of credit.


PART II

Item 1.   Legal Proceedings

     In regards to the litigation reported in Item 3 of the annual report
on Form 10-K for the fiscal year ended March 31, 1998, there have been no
material changes.

Item 2.   Changes in Securities

     No changes have been made in any registered securities.

Item 3.   Defaults Upon Senior Securities

     No event constituting a material default has occurred respecting any
senior security of the Registrant.

Item 4.   Submission of Matters to a Vote of Security Holders

     None

Item 5.   Other Information

     None

Item 6.   Exhibits and Reports on Form 8-K

     10(a)     Consent Decree of Permanent Injunction, between United
               States of America and Mentor Corporation, dated May 6,
               1998

     10(b)     Distribution Agreement, dated June 13, 1997, between
               Mentor Corporation and Intracel Corporation
     
     10(c)     Stock Purchase Agreement, dated June 16, 1997, between
               Mentor Corporation and Intracel Corporation
     
     10(d)     Research , Collaboration and Distribution Agreement, dated
               December 22, 1997, between Mentor Corporation and Intracel
               Corporation
     
     10(e)     Stock Purchase Agreement, dated December 22, 1997, between
               Mentor Corporation and Intracel Corporation

     11        Statement regarding computation of Per Share Earnings

Pursuant to the requirement of the Securities Exchange Act of 1934, the
Registrant has duly caused this Report to be signed on its behalf by the
undersigned thereunto duly authorized.


MENTOR CORPORATION
(Registrant)



DATE:     August 14, 1998          BY:  /s/ANTHONY R. GETTE
          Anthony R. Gette
            President and
            Chief Operating Officer


DATE:     August 14, 1998          BY:   /s/GARY E. MISTLIN
          Gary E. Mistlin
            Chief Financial Officer

EXHIBIT 11
                   MENTOR CORPORATION AND SUBSIDIARIES
          STATEMENT REGARDING COMPUTATION OF PER SHARE EARNINGS
                (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)


                             Three Months Ended
                                  June 30,
                              1998        1997
Numerator:                              
                                        
  Net income                $  7,839    $  7,803
  Numerator for basic                   
    earnings per share -                
    income available to     ________    ________
    common stockholders        7,839       7,803
                                        
  Numerator for diluted                 
    earnings per share -                
    income available to                 
    common stockholder                  
    after assumed           ________    ________
    conversions             $  7,839    $  7,803
                                        
Denominator:                            
  Denominator for basic                 
    earnings per share -                
    weighted-average                    
    shares                    25,036      24,782
                                        
  Effect of dilutive                    
securities:
    Employee stock options     1,252       1,529
                                        
    Denominator for diluted             
      earnings per share -              
      adjusted weighted-                
      average shares and    ________    ________
      assumed conversions     26,288      26,311
                                        
Basic earnings per share    $    .31    $    .31
Diluted earnings per share  $    .30    $    .30



<TABLE> <S> <C>

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<CIK> 0000064892
<NAME> FDS
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          MAR-31-1999
<PERIOD-END>                               JUN-26-1998
<CASH>                                          25,902
<SECURITIES>                                    10,829
<RECEIVABLES>                                   40,853
<ALLOWANCES>                                     2,863
<INVENTORY>                                     46,589
<CURRENT-ASSETS>                               132,889
<PP&E>                                          41,992
<DEPRECIATION>                                   2,418
<TOTAL-ASSETS>                                 207,623
<CURRENT-LIABILITIES>                           33,119
<BONDS>                                              0
                                0
                                          0
<COMMON>                                         2,504
<OTHER-SE>                                     168,657
<TOTAL-LIABILITY-AND-EQUITY>                   207,623
<SALES>                                         57,018
<TOTAL-REVENUES>                                57,018
<CGS>                                           19,165
<TOTAL-COSTS>                                   45,631
<OTHER-EXPENSES>                                    59
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  10
<INCOME-PRETAX>                                 11,701
<INCOME-TAX>                                     3,862
<INCOME-CONTINUING>                              7,839
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     7,839
<EPS-PRIMARY>                                      .31
<EPS-DILUTED>                                      .30
        

</TABLE>

               IN THE UNITED STATES DISTRICT COURT
               FOR THE NORTHERN DISTRICT OF TEXAS
                         DALLAS DIVISION



                              )
UNITED STATES OF AMERICA,     )
                              )
               Plaintiff,     )
                              )    Civil No.  3-98CV1105-G
          v.                  )
                              )
MENTOR CORPORATION, et al.,   )    CONSENT DECREE OF
                              )    PERMANENT INJUNCTION
               Defendants.    )
______________________________)



     Plaintiff, United States of America, having filed its

Complaint for Injunction alleging violations of the Federal Food,

Drug, and Cosmetic Act ("FDC Act"), 21 U.S.C.  301 et seq.,

against Mentor Corporation ("MC") and Mentor Texas, Inc. ("MTI"),

corporations, and Christopher J. Conway and Anthony R. Gette,

individuals (collectively, "defendants");

     Defendants having appeared and having consented to entry of

this Decree, without admitting any of the allegations in the

Complaint, without contest and before any testimony has been

taken; and,

     The United States of America having consented to this

Decree;

     THEREFORE, IT IS HEREBY ORDERED, ADJUDGED, AND DECREED that:

     I.   This Court has jurisdiction over the subject matter and

over all parties to this action pursuant to 21 U.S.C.  332(a)

and 28 U.S.C.  1331, 1337(a), and 1345.

     II.  Venue is proper in this District under 28 U.S.C.

55 1391(b) and 1391(c).

     III. The Complaint for Injunction states a cause of action

against defendants under the FDC Act.

     IV.  Following entry of this Decree, defendants shall,

within the time frames set forth below, take the steps necessary

to establish, implement, and continuously maintain adequate

methods, facilities, and controls to ensure that each and every

silicone saline-fill (inflatable) breast prosthesis or silicone

gel-filled breast prosthesis, including any component, part or

accessory of such breast prosthesis, but not including skin or

tissue expanders, or sizers, (hereafter "breast prosthesis") they

manufacture, process, pack, hold, or distribute is in compliance

with 21 U.S.C.  351(h).

     Such steps shall include the following:

     A.   Within 20 calendar days after entry of this Decree,

defendants shall select and retain, at corporate defendants'

expense, one or more person(s) who by reason of education,

training, and experience is (are) qualified to inspect a device

manufacturing facility, conduct investigations, design

appropriate procedures, controls, and standard operating

procedures ("SOPs"), and prepare reports (hereafter, "expert

consultant") as set forth in this Decree, as are necessary to

ensure that the methods used in, and the facilities and controls

used for, defendants' manufacturing, processing, packing,

holding, and distributing of breast prostheses (hereafter,

"methods, facilities, and controls") are in conformity with the

applicable current good manufacturing practice ("CGMP")

requirements under 21 U.S.C.  360j(f)(1) and 21 C.F.R. Part 820

(1997).

     B.   Within 60 calendar days after entry of this Decree, the

expert consultant shall: (a) review all FDA inspectional

observations issued in connection with inspections of MTI since

July 1, 1995 ("MTI Forms FDA-483"), and defendants' responses

thereto; (b) conduct a comprehensive CGMP inspection and audit of

the methods, facilities, and controls; and (c) submit a detailed,

written report to defendants and to FDA, as to whether, in his or

her opinion, there are any deviations from CGMP, and if so, which

deviations in his or her opinion are significant, and whether

each of the observations listed in each MTI Form FDA-483 has been

fully corrected.  Defendants shall establish and meet specific

time frames for correcting each outstanding deficiency noted by

the expert consultant.  These time frames shall be submitted in

writing to FDA within 15 calendar days of receipt by defendants

of the expert consultant report and shall be subject to FDA

approval.  FDA shall approve, reject, or modify the time frames,

and explain the basis for its decision, in writing within 10

calendar days after receipt by FDA of the time frames from

defendants.

     C.   Within 60 calendar days after entry of this Decree,

defendants, working with the expert consultant, shall establish

and continuously maintain procedures for corrective and

preventive actions needed to correct and prevent quality problems

("action procedures") identified regarding the methods,

facilities, and controls, and shall establish and continuously

maintain procedures to adequately document any corrective and

preventive actions taken ("action documentation procedures"), as

required by 21 C.F.R.  820.100 (1997).  Within 15 calendar days

of completion of defendants' implementation of the action

procedures and action documentation procedures, the expert

consultant shall submit a detailed, written report to defendants

and to FDA, as to whether, in his or her opinion, the action

procedures implemented by defendants will adequately correct and

prevent identified quality problems and whether, in his or her

opinion, the action documentation procedures implemented by

defendants will adequately document any corrective and preventive

actions taken.

     D.   Within 90 calendar days after entry of this Decree,

defendants, working with the expert consultant, shall establish

and continuously maintain procedures to document the review,

evaluation, and, where appropriate, revalidation of processes

when changes or deviations in such processes occur ("process

documentation procedures") in the methods, facilities, and

controls, as required by 21 C.F.R.  820.75(c) (1997).  Within 15

calendar days of completion of defendants' implementation of the

process documentation procedures, the expert consultant shall

submit a detailed, written report to defendants and to FDA, as to

whether, in his or her opinion, the process documentation

procedures implemented by defendants will adequately document the

review, evaluation, and, where appropriate, revalidation of

processes when changes or deviations in such processes occur.

     E.   Within 90 calendar days after entry of this Decree,

defendants, working with the expert consultant, shall establish

and continuously maintain procedures to ensure that defendants'

device master records ("DMRs") for breast prostheses include, or

refer to the location of, production process specifications

including the appropriate equipment specifications, production

methods, production procedures, and production environmental

specifications ("DMRs procedures"), as required by 21 C.F.R.

 820.181(b) (1997).  Within 15 calendar days of completion of

the DMRs procedures, the expert consultant shall submit a

detailed, written report to defendants and to FDA, as to whether,

in his or her opinion, the DMRs procedures implemented by

defendants adequately ensure that defendants' DMRs include, or

refer to the location of, production process specifications

described in this paragraph.

     F.   Within 180 calendar days after entry of this Decree,

defendants, working with the expert consultant, shall complete

validation of all silicone saline-fill (inflatable) breast

prosthesis manufacturing processes, where the results of such

processes cannot be fully verified by subsequent inspection and

testing, as required by 21 C.F.R.  820.75(a) (1997).  Beginning

20 calendar days after the date of entry of this Decree, the

expert consultant shall submit written status reports to FDA

every 60 calendar days describing the progress of defendants'

validation efforts pursuant to this paragraph.  Within 15

calendar days of completion of defendants' validation efforts

pursuant to this paragraph, the expert consultant shall submit a

detailed, written report to defendants and to FDA, as to whether,

in his or her opinion, defendants have fully and successfully

completed all necessary validation.

     G.   Within 240 calendar days after entry of this Decree,

defendants, working with the expert consultant, shall complete

validation of all silicone gel-filled breast prosthesis

manufacturing processes, where the results of such processes

cannot be fully verified by subsequent inspection and testing, as

required by 21 C.F.R.  820.75(a) (1997).  Beginning 20 calendar

days after the date of entry of this Decree, the expert

consultant shall submit written status reports to FDA every 60

calendar days describing the progress of defendants' validation

efforts pursuant to this paragraph.  Within 15 calendar days of

completion of defendants' validation efforts pursuant to this

paragraph, the expert consultant shall submit a detailed, written

report to defendants and to FDA, as to whether, in his or her

opinion, defendants have fully and successfully completed all

necessary validation.

     H.   Within one year after entry of this Decree, and,

subsequently, no less frequently than once a year for a period of

four years following entry of this Decree, the expert consultant

shall conduct a comprehensive inspection of the methods,

facilities, and controls to ensure that defendants are in

compliance with CGMP.  The expert consultant shall prepare a

detailed, written report ("post compliance inspection report") of

each inspection conducted pursuant to this paragraph.  In each

post compliance inspection report, the expert consultant shall

express his or her opinion as to whether defendants are in full

compliance with CGMP requirements; the expert consultant shall

submit the post compliance inspection reports simultaneously to

FDA and defendants no later than 20 calendar days after

completion of the inspections referred to in this paragraph.

     V.   After compliance with the deadlines in paragraph IV,

defendants and each and all of their officers, directors, agents,

employees, representatives, attorneys, successors, assigns, and

any and all persons in active concert or participation with any

of them who receive notice of this Decree are permanently

enjoined pursuant to 21 U.S.C.  332(a) and the inherent equity

powers of this Court from directly or indirectly doing or causing

to be done any of the following acts:

     A.   Violating 21 U.S.C.  331(a), by introducing or

delivering, or causing to be introduced or delivered into

interstate commerce, any breast prosthesis, including any

component, part or accessory of such breast prosthesis, which is

a device, as defined in 21 U.S.C.  321(h), that is adulterated

within the meaning of 21 U.S.C.  351(h); and

     B.   Violating 21 U.S.C.  331(k), by causing the

adulteration of any such device, as defined in 21 U.S.C.

321(h), within the meaning of 21 U.S.C.  351(h), while such

device is held for sale after shipment of one or more of its

components in interstate commerce.

     VI.  Defendants shall, as FDA deems necessary to ensure

continuing compliance with the terms of this Decree, permit duly

authorized FDA representatives to make inspections of all MTI

facilities, including all articles of device therein, pertinent

equipment, finished and unfinished materials, containers,

labeling, and all records (including, but not limited to,

electronic, magnetic, and optical media; all computer hardware

and software; computer printouts; raw data and laboratory data

generated in connection with any expert consultant reports

required by this Decree; and all expert consultant reports

required by this Decree), files, papers, SOPs, and processes and

controls; to take photographs; to collect samples of any of

defendants' products and labeling; to conduct analyses on any

samples of defendants' products that are collected; and to copy

any of the foregoing records.  The costs of all such inspections,

record reviews, and sample analyses shall be borne by corporate

defendants at the rates specified in paragraph VII of this

Decree.  The inspections described in this Decree shall be

permitted upon presentation of a copy of this Decree and

appropriate credentials.  Such inspection authority shall be

apart from, and in addition to, the authority to make inspections

under the FDC Act.

     VII. Corporate defendants shall reimburse FDA for the costs

of all FDA inspections, examinations, analytical work, and review

work that FDA deems necessary to evaluate defendants' compliance

with any part of this Decree at the standard rates prevailing at

the time the activities are accomplished.  As of the date that

this Decree is signed by the parties, these rates are:  $55.06

per hour and any fraction thereof per representative for

inspection work; $65.99 per hour and any fraction thereof per

representative for analytical work and review work; $0.31 per

mile for travel expenses by automobile; government rate or the

equivalent for travel by air; and the published government per

diem rate or the equivalent for the areas in which the

inspections are performed per day per representative for

subsistence expenses, where necessary.  In the event that the

standard rates applicable to FDA supervision of court-ordered

compliance are modified, these rates shall be increased or

decreased without further order of the Court.

     VIII.     Within 10 calendar days of the date of entry of

this Decree, defendants shall provide a copy of this Decree to

all supervisory and managerial employees, agents, and

representatives of MC and MTI who are involved in the

manufacturing, processing, packing, holding, or distributing of

breast prostheses, including, but not limited to, all officers,

directors, and attorneys.  Within 30 calendar days after entry of

this Decree, defendants shall ensure that all other employees of

MC and MTI involved in the manufacturing, processing, packaging,

holding, or distributing of breast prostheses are aware of the

terms of this Decree by: (1) either providing them with copies or

posting copies in conspicuous places frequented by and readily

accessible to employees, and (2) explaining the purpose and

content of the Decree and telling them where a copy of the Decree

may be seen or obtained.  Within 45 calendar days of the date of

entry of this Decree, defendants shall provide FDA with an

affidavit, sworn to by the Chief Executive Officer and a person

with personal knowledge of the facts, stating the fact and manner

of their compliance with this paragraph and identifying the names

and positions of all persons provided with a copy of the Decree

pursuant to this paragraph.  A new affidavit meeting the

requirements of this paragraph shall be provided to FDA every six

months after entry of this Decree to reflect notification of new

officers, directors, or employees who subsequently become

involved in the manufacturing, processing, packing, holding, or

distributing of breast prostheses and who have not previously

been notified pursuant to this paragraph.

     IX.  Defendants shall notify FDA in writing at least 30

calendar days before any change in ownership, character, or name

of their business, that occurs after entry of this Decree; such

change shall include, but not be limited to, reorganization,

relocation, dissolution, assignment, sale of assets or business,

or any other change that may affect compliance obligations

arising out of this Decree.  Defendants shall serve a copy of

this Decree on any prospective successor or assign at least 30

calendar days prior to such sale or assignment, and shall furnish

FDA with an affidavit of compliance with this paragraph within 15

calendar days of such sale or change in business.

     X.   If, at any time after entry of this Decree, FDA

determines that defendants are not in compliance with the FDC Act

or applicable regulations with respect to the manufacturing,

processing, packing, holding, or distributing of breast

prostheses, or any provision of this Decree, or that any report

or plan prepared or submitted by, or on behalf of, defendants

pursuant to this Decree, or any measure implemented by defendants

to comply with this Decree, is inadequate to bring defendants

into compliance with the FDC Act, applicable regulations,

defendants' SOPs, or the provisions of this Decree, FDA may, as

and when it deems necessary, order in writing that defendants

take appropriate corrective action within specified time frames,

including, one or more of the following actions:

     A.   revise, modify, or expand any report(s) or plan(s)

prepared pursuant to this Decree;

     B.   submit additional reports or information to FDA;

     C.   cease manufacturing, processing, packing, holding,

and/or distributing devices;

     D.   recall specified devices in accordance with procedures

identified by FDA; or

     E.   take any other corrective action(s) as FDA, in its

discretion, deems necessary to bring defendants and their devices

into compliance with the FDC Act, applicable regulations, and

this Decree.

     XI.  Any order issued pursuant to paragraph X shall be

issued by the appropriate District Director, and shall specify

the violations giving rise to the order.  Unless a different time

frame is specified by FDA, within 5 business days after receiving

an order pursuant to paragraph X, defendants shall advise FDA in

writing either that: (1) defendants are undertaking or have

undertaken all corrective action(s) requested by FDA, in which

event defendants shall also describe the specific action(s) taken

or to be taken and the time frame(s) in which the action(s) will

be completed; or (2) defendants do not agree with FDA's order.

If defendants notify FDA that they do not agree with FDA's order,

defendants shall explain in writing the complete basis for their

disagreement.  FDA will review defendants' response and, in

writing, affirm, modify, or withdraw its order as FDA deems

appropriate.  If FDA affirms or withdraws the order, FDA's order

shall take effect as the final order.  In the event that FDA

significantly modifies its earlier decision, defendants shall

have 2 business days to submit, in writing, facts and reasons why

they disagree with the modification.  FDA will review defendants'

response and shall then issue a final order.  Immediately upon

receipt of the final order, defendants shall proceed with

implementation of all corrective action deemed necessary by FDA

as set forth in the final order.  Defendants shall continue to

implement FDA's final order, unless and until FDA or the Court

issues an order to the contrary.

     During any period after a final order becomes effective,

defendants may request that FDA inspect their facility to

determine whether the deficiencies described in FDA's final order

have been corrected.  FDA will not conduct any such inspection

unless and until defendants have obtained and supplied to FDA the

written statement of a person who, by reason of training and

experience, is qualified to make inspections of defendants'

facility and determine whether appropriate corrective action(s)

has been taken, certifying that he or she has inspected

defendants' facility and has concluded that defendants have

corrected each of the deficiencies described in the final order.

Unless public health concerns intervene, FDA shall begin

defendants' requested inspection within 7 working days of receipt

of the expert certification meeting the requirements described in

this paragraph.  Within a reasonable time after completing its

inspection, FDA shall notify defendants of its finding whether

defendants have corrected the deficiencies and of its decision to

affirm, modify, or withdraw the order with reasons given in

support thereof.  Any inspection conducted pursuant to this

paragraph shall be governed by paragraphs VI and VII of this

Decree.

     XII.  Until defendants satisfy all of the requirements of

paragraph IV of this Decree, if any defendant materially violates

any provision of this Decree, the corporate defendants shall pay

to the United States an administrative civil penalty in the

amount of $10,000 for each day such violation continues.  At any

time after entry of this Decree, and at all times while this

Decree is in effect, if any defendant violates paragraph V of

this Decree, the corporate defendants shall pay to the United

States an administrative civil penalty in the amount of $10,000

for each day that the violation continues.  Any order assessing

an administrative civil penalty under this paragraph shall be

issued in accordance with the procedures set forth in paragraph

XI of this Decree.  The administrative civil penalties described

in this paragraph are separate from, and payable in addition to,

any fines assessed by the Court in civil or criminal contempt

proceedings.  The administrative civil penalties described in

this paragraph shall be due and payable immediately upon issuance

of a final order by FDA pursuant to paragraph XI or, if appealed,

by the Court, of a violation, as described above in this

paragraph.  The administrative civil penalties specified in this

paragraph are not punitive in nature and their imposition does

not in any way limit the ability of the United States to seek,

and the Court to impose, criminal or civil penalties based on

conduct that may also be the basis for the payment of the

administrative civil penalties.

     XIII.     If any defendant violates this Decree and is found

in civil or criminal contempt thereof, defendants shall, in

addition to other remedies, reimburse the United States for

attorney fees, investigational expenses, administrative and court

costs, and any other costs or fees related to such enforcement

proceedings.

     XIV. All decisions conferred upon FDA in this Decree shall

be vested in the discretion of FDA.  Defendants shall abide by

the decisions of FDA, and FDA's decisions shall be final.  If

necessary, FDA's decisions shall be reviewed by this Court under

the arbitrary and capricious standard set forth in 5 U.S.C.

 706(2)(A).  Any such review of an FDA decision brought before

this Court shall be based exclusively on the record before FDA at

the time FDA made the decision at issue, and no discovery may be

taken by either party.

     XV.  All notifications, correspondence, communications, and

reports to FDA required by the terms of this Decree shall be

prominently marked "Decree Correspondence" and shall be sent

simultaneously to: (1) FDA District Director, Dallas District

Office, U.S. Food and Drug Administration, 3310 Live Oak Street,

3rd Floor, Dallas, Texas 75204; and (2) U.S. Food and Drug

Administration, General Surgery Devices Branch, HFZ-323, Division

of Enforcement I, Office of Compliance, Center for Devices and

Radiological Health, 2098 Gaither Road, Rockville, Maryland

20850.

     XVI. Defendants shall bear their own costs, including

attorney fees, for compliance with this Decree, in addition to

any costs expressly provided herein.

     XVII.     Defendants' obligations under this Decree do not

modify or absolve defendants from any obligation to comply with

the FDC Act or any other federal statute or regulation.

     XVIII.    If defendants maintain a state of continuous

compliance with the terms of this Decree for a period of sixty

months from the date defendants satisfy all the requirements of

paragraph IV of this Decree, should defendants petition the Court

to dissolve this Decree, the government will not oppose.

     XIX. This Court retains jurisdiction of this action for the

purpose of modifying this Decree and for the purpose of granting

such additional relief as may be necessary or appropriate.


     SO ORDERED:

Dated this 6th day of May, 1998.

                                   /S/(Judge Fish)
                                   U.S. DISTRICT JUDGE


     We hereby consent to the entry of this Decree and to its
form and contents.

/S/ARTHUR N. LEVINE                FRANK W. HUNGER
ARTHUR N. LEVINE                   Assistant Attorney General
Arnold & Porter                    Civil Division
Attorney for MENTOR CORPORATION    Department of Justice
  and MENTOR TEXAS, INC.

/S/DOUGLAS H. ALTSCHULER           PAUL E. COGGINS
DOUGLAS H. ALTSCHULER              United States Attorney
Chief Counsel
Attorney for MENTOR CORPORATION
  and MENTOR TEXAS, INC.           KAREN M. VALENTINE
                                   Attorney
/S/CHRISTOPHER J. CONWAY           Maryland Bar No.: 01920
CHRISTOPHER J. CONWAY,             Office of Consumer Litigation
  individually and as Chief        Civil Division
  Executive Officer and            U.S. Department of Justice
Chairman of the Board,             P.O. Box 386
  MENTOR CORPORATION               Washington, D.C. 20044
                                   (202) 514-0514
/S/ANTHONY R. GETTE                (202) 514-8742 (fax)
ANTHONY R. GETTE,
  individually and as President    OF COUNSEL:
  and Chief Operating Officer
  of MENTOR CORPORATION            MARGARET JANE PORTER
                                   Chief Counsel

                                   CHRISTOPHER B. MCHENRY
                                   Associate Chief Counsel
                                     for Enforcement
                                     U.S. Food and Drug
                                     Administration


                               6
|DC_DOCS\96018.1||
                    PERIMMUNE HOLDINGS, INC.
                                
                      AMENDED AND RESTATED
                                
                  REGISTRATION RIGHTS AGREEMENT
                                

                  Dated as of December 22, 1997
                                

                    PERIMMUNE HOLDINGS, INC.
                                
         1330 Piccard Drive, Rockville, Maryland  20850
                                
          This Amended and Restated Registration Rights Agreement
("Agreement") is made and entered into as of December  22,  1997,
by  and  among  PerImmune Holdings, Inc., a Delaware  corporation
(the  "Company"),  and the stockholder of the Company  who  is  a
signatory hereto (the "Investor").

          WHEREAS, the Company and the Investor entered into that
certain  Registration Rights Agreement dated as of June 16,  1997
in connection with that certain Stock Purchase Agreement dated as
of  June 16, 1997 (the "June Stock Purchase Agreement"), pursuant
to which the Investor purchased 20 shares of Series B Convertible
Preferred Stock, par value $0.01.

          WHEREAS, the Company and the Investor have entered into
that certain Stock Purchase Agreement dated as of the date hereof
(the "December Stock Purchase Agreement"), pursuant to which  the
Investor  purchased 100 shares of Series B Convertible  Preferred
Stock, par value $0.01.

          WHEREAS,   the  Company  desires  to  grant  the   same
registration rights it granted to the Investor in respect of  the
shares  purchased pursuant to the June Stock Purchase  Agreement,
to  such Investor in respect of the shares purchased pursuant  to
the December Stock Purchase Agreement.

          Accordingly, in consideration of the foregoing  and  of
the  mutual  promises, covenants and conditions set forth  below,
the parties hereby agree as follows:

1.   Definitions
     
          As  used  in  this Agreement, the following capitalized
terms shall have the following meanings:

          Board  of  Directors:  The Board of  Directors  of  the
     Company.
     
          Claim:  Any  loss,  claim, damages,  liability  or
     expense    (including   the   reasonable    costs    of
     investigation and legal fees and expenses).
     
          Common  Stock:  The common stock, par value  $0.01  per
     share, of the Company.
     
          Equity  Security: Any capital stock of the  Company  or
     any  security  convertible, with or  without  consideration,
     into any such stock, or any security carrying any warrant or
     right  to  subscribe to or purchase any such stock,  or  any
     such warrant or right.
     
          Exchange  Act: The Securities Exchange Act of 1934,  as
     from time to time amended.
     
          Firm  Commitment Underwritten Offering: An offering  in
     which  the  underwriters  agree to purchase  securities  for
     distribution pursuant to a registration statement under  the
     Securities   Act  and  in  which  the  obligation   of   the
     underwriters is to purchase all the securities being offered
     if any are purchased.
     
          Holder:  The beneficial owner of a security.   For  all
     purposes of this Agreement, the Company shall be entitled to
     treat the record owner of a security as the beneficial owner
     of  such  security unless the Company has been given written
     notice   of  the  existence  and  identity  of  a  different
     beneficial owner.
     
          Indemnified   Holder:   Any   Holder   of   Registrable
     Securities, any officer, director, employee or agent of  any
     such  Holder  and  any Person who controls any  such  Holder
     within  the  meaning of either Section 15 of the  Securities
     Act or Section 20 of the Exchange Act.
     
          Misstatement: An untrue statement of a material fact or
     an  omission to state a material fact required to be  stated
     in  a  Registration Statement or Prospectus or necessary  to
     make  the statements in a Registration Statement, Prospectus
     or preliminary prospectus not misleading.
     
          Person:  A  natural  person, partnership,  corporation,
     business  trust, association, joint venture or other  entity
     or a government or agency or political subdivision thereof.
     
          Piggyback  Registration:  A  registration  pursuant  to
     Section 2 hereof.
     
          Preferred  Stock:  The  Series B Convertible  Preferred
     Stock,  par value $0.01 per share, issued and sold  pursuant
     to the Stock Purchase Agreements (as defined herein).
     
          Prospectus: The prospectus included in any Registration
     Statement,   as  supplemented  by  any  and  all  prospectus
     supplements  and  as  amended by any and all  post-effective
     amendments  and  including  all  material  incorporated   by
     reference in such prospectus.
     
          Qualifying  IPO:   The  first registered,  underwritten
     public offering of shares of Common Stock by the Company.
     
          Registrable Securities: (a) The shares of Common  Stock
     held  by  the  Investor, and (b) any  securities  issued  or
     issuable with respect to such Common Stock by way of a stock
     dividend  or stock split or in connection with a combination
     of   shares,  recapitalization,  merger,  consolidation   or
     reorganization;  provided  that  any  such  share  or  other
     security  shall be deemed to be Registrable Securities  only
     if and so long as it is a Transfer Restricted Security.
     
          Registration: A Piggyback Registration.
     
          Registration Expenses: The out-of-pocket expenses of  a
     Registration, including:
     
               (1)  all registration and filing fees (including fees with
          respect to filings required to be made with the National
          Association of Securities Dealers);
          
               (2)  fees and expenses of compliance with securities or blue sky
          laws (including fees and disbursements of counsel for the
          underwriters or selling holders in connection with blue sky
          qualifications of the Registrable Securities and determinations
          of their eligibility for investment under the laws of such
          jurisdictions as the managing underwriters or holders of a
          majority of the Registrable Securities being sold may designate);
          
               (3)  printing, messenger, telephone and delivery expenses;
          
               (4)  fees and disbursements of counsel for the Company, counsel
          for the underwriters and of not more than one firm of attorneys
          for the sellers of the Registrable Securities (the attorneys for
          such sellers to be determined by a vote of the majority of the
          aggregate shares of Registrable Securities requested to be
          included in the Registration Statement for  such Registration);
          
               (5)  fees and disbursements of all independent certified public
          accountants of the Company incurred in connection with such
          Registration (including the expenses of any special audit and
          "cold comfort" letters incident to such registration);
          
               (6)  fees and disbursements of underwriters (excluding discounts,
          commissions or fees of underwriters, selling brokers, dealer
          managers or similar securities industry professionals relating to
          the distribution of the Registrable Securities);
          
               (7)  premiums and other costs of securities acts liability
          insurance if the Company so desires or if the underwriters or
          selling holders of Registrable Securities so require; and
          
               (8)  fees and expenses of any other Persons retained by the
          Company.
          
          Registration  Statement:  Any  registration   statement
     under the Securities Act on an appropriate form (which  form
     shall   be   available  for  the  sale  of  the  Registrable
     Securities in accordance with the intended method or methods
     of  distribution  thereof and shall  include  all  financial
     statements required by the SEC to be filed therewith)  which
     covers Registrable Securities pursuant to the provisions  of
     this  Agreement, including the Prospectus included  in  such
     registration statement, amendments (including post-effective
     amendments) and supplements to such registration  statement,
     and  all  exhibits  to  and  all  material  incorporated  by
     reference in such registration statement.
     
          Securities  Act: The Securities Act of  1933,  as  from
     time to time amended.
     
          SEC: The Securities and Exchange Commission.
     
          Stock  Purchase  Agreements:  The June  Stock  Purchase
     Agreement and the December Stock Purchase Agreement.
     
          Transfer Restricted Security: A security that  has  not
     been sold to or through a broker, dealer or underwriter in a
     public  distribution or other public securities  transaction
     or  sold  in a transaction exempt from the registration  and
     prospectus delivery requirements of the Securities Act under
     Rule  144  promulgated thereunder (or any  successor  rule).
     The  foregoing  notwithstanding, a security shall  remain  a
     Transfer  Restricted Security until (i)  all  stop  transfer
     instructions  or  notations  and  restrictive  legends  with
     respect  to  such security have been lifted or  removed  and
     (ii)  the  Holder of such security has received  at  Company
     expense  an opinion of counsel to the Company (which counsel
     and opinion are reasonably satisfactory to such Holder),  to
     the  effect  that  such shares in such  Holder's  hands  are
     freely  transferable  in any public or  private  transaction
     without  registration  under the  Securities  Act  (or  such
     Holder has waived receipt of such opinion).
     
          Underwritten Registration or Underwritten  Offering:  A
     registration in which securities of the Company are sold  to
     an underwriter for distribution to the public.
     
2.   Piggyback Registrations
     
     (a)  Participation
          
          Each  time  the Company decides to file a  Registration
Statement under the Securities Act (other than on Forms S-4 or S-
8 or any successor form thereto and other than in connection with
a Qualifying IPO) covering the offer and sale by it or any of its
security holders of any of its securities for money, the  Company
shall  give  written notice thereof to all Holders of outstanding
Registrable Securities, which written notice shall state that the
Company has decided to so file a registration statement and shall
include the approximate date that such registration statement  is
expected to be filed with the SEC and the name of any underwriter
(if  any)  with  respect  to such offering.   The  Company  shall
include in such registration statement such shares of Registrable
Securities for which it has received written requests to register
such  shares  within 30 days after such written notice  has  been
given.  If the registration statement is to cover an Underwritten
Offering,  such Registrable Securities shall be included  in  the
underwriting  on the same terms and conditions as the  securities
otherwise being sold through the underwriters.

     (b)  Underwriter's Cutback
          
          Subject to the requirements of Section 10 hereof, if in
the  good  faith  judgment of the managing  underwriter  of  such
offering  the  inclusion  of  all of the  shares  of  Registrable
Securities  and any other Common Stock requested to be registered
would interfere with the successful marketing of a smaller number
of  such  shares,  then  the  number  of  shares  of  Registrable
Securities and other Common Stock to be included in the  offering
shall be reduced to such smaller number with the participation in
such  offering  to  be in the following order of  priority:   (1)
first,  the shares of Common Stock which the Company proposes  to
sell  for  its own account, (2) second, the shares of Registrable
Securities and any other shares of Common Stock requested  to  be
included.   Any necessary allocation among the Holders of  shares
within each of the foregoing groups shall be pro rata among  such
Holders  requesting such registration based upon  the  number  of
shares  of Common Stock and Registrable Securities owned by  such
Holders.

     (c)  Company Control
          
          The   Company   may  decline  to  file  a  Registration
Statement  after giving notice to any Holder pursuant to  Section
3(a) above, or withdraw a Registration Statement after filing and
after  such  notice,  but  prior to  the  effectiveness  thereof,
provided  that the Company shall promptly notify each  Holder  in
writing  of any such action and provided further that the Company
shall  bear all expenses incurred by such Holder or otherwise  in
connection with such withdrawn Registration Statement.

3.   Hold-Back Agreements
     
          Upon the written request of the managing underwriter of
any  Underwritten Offering of the Company's securities, a  Holder
of Registrable Securities shall not sell, make any short sale of,
loan,  grant any option for the purchase of, or otherwise dispose
of  any Registrable Securities (other than those included in such
registration) without the prior written consent of such  managing
underwriter  for  a  period (not to exceed  30  days  before  the
effective  date  and  180  days thereafter)  that  such  managing
underwriter reasonably determines is necessary in order to effect
the  underwritten  public offering; provided  that  each  of  the
officers  and  directors of the Company shall have  entered  into
substantially  similar  holdback agreements  with  such  managing
underwriter covering at least the same period.

4.   Registration Procedures
     
          If  and  whenever the Company is required  to  register
Registrable  Securities in a Piggyback Registration, the  Company
will  use its best efforts to effect such registration to  permit
the  sale  of such Registrable Securities in accordance with  the
intended  plan of distribution thereof, and pursuant thereto  the
Company will as expeditiously as possible:

          a)   prepare and file with the SEC as soon as practicable a
Registration   Statement  with  respect   to   such   Registrable
Securities  and  use its best efforts to cause such  Registration
Statement  to become effective and remain continuously  effective
until  the date earlier to occur of (i) the date six months  from
the  date such Registration Statement was declared effective, and
(ii)  the date the last of the Registrable Securities covered  by
such  Registration Statement have been sold provided that  before
filing  a  Registration Statement or Prospectus or any amendments
or  supplements thereto, the Company shall furnish to the Holders
of  the  Registrable  Securities  covered  by  such  Registration
Statement and the underwriters, if any, draft copies of all  such
documents  proposed to be filed, which documents will be  subject
to  the  review of such Holders and underwriters, and the Company
shall not file any Registration Statement or amendment thereto or
any Prospectus or any supplement thereto to which the Holders  of
a   majority  of  the  Registrable  Securities  covered  by  such
Registration  Statement  or  the  underwriters,  if  any,   shall
reasonably object;

          b)   prepare and file with the SEC such amendments and post-
effective  amendments  to the Registration  Statement,  and  such
supplements to the Prospectus, as may be requested by any  Holder
of  Registrable  Securities  or any  underwriter  of  Registrable
Securities  or  as may be required by the rules,  regulations  or
instructions  applicable to the registration  form  used  by  the
Company  or  by  the  Securities Act  or  rules  and  regulations
thereunder to keep the Registration Statement effective until all
Registrable Securities covered by such Registration Statement are
sold  in  accordance with the intended plan of  distribution  set
forth  in  such  Registration  Statement  or  supplement  to  the
Prospectus;

          c)   promptly notify the selling Holders of Registrable
Securities  and  the  managing  underwriter,  if  any,  and   (if
requested by any such Person) confirm such advice in writing,

               (1)  when the Prospectus or any supplement or post-effective
          amendment has been filed, and, with respect to the Registration
          Statement or any post-effective amendment, when the same has
          become effective,
          
               (2)  of any request by the SEC for amendments or supplements to
          the Registration Statement or the Prospectus or for additional
          information,
          
(3)  of the issuance by the SEC of any stop order suspending the
effectiveness of the Registration Statement or the initiation of
any proceedings for that purpose,
(4)  if at any time the representations and warranties of the
Company contemplated by clause (1) of paragraph (o) below cease
to be accurate in all material respects,
(5)  of the receipt by the Company of any notification with
respect to the suspension of the qualification of the Registrable
Securities for sale in any jurisdiction or the initiation or
threatening of any proceeding for such purpose, and
(6)  of the existence of any fact which results in the
Registration Statement, the Prospectus or any document
incorporated therein by reference containing a Misstatement;
          d)   make every reasonable effort to obtain the withdrawal of any
order  suspending the effectiveness of the Registration Statement
at the earliest possible time;

          e)   if requested by the managing underwriter or a Holder of
Registrable   Securities  being  sold  in  connection   with   an
Underwritten Offering, immediately incorporate in a supplement or
post-effective  amendment  such  information  as   the   managing
underwriter  and  the Holders of a majority  of  the  Registrable
Securities  being sold agree should be included therein  relating
to  the  sale  of the Registrable Securities, including,  without
limitation, information with respect to the number of  shares  of
Registrable  Securities being sold to underwriters, the  purchase
price  being paid therefor by such underwriters and with  respect
to   any  other  terms  of  the  Underwritten  Offering  of   the
Registrable Securities to be sold in such offering; and make  all
required  filings of such supplement or post-effective  amendment
as  soon  as notified of the matters to be incorporated  in  such
supplement or post-effective amendment;

          f)   promptly prior to the filing of any document which is to be
incorporated by reference into the Registration Statement or  the
Prospectus  (after initial filing of the Registration  Statement)
provide copies of such document to counsel to the selling Holders
of  Registrable  Securities and to the managing  underwriter,  if
any,  and  make  the  Company's  representatives  available   for
discussion  of  such  document and  make  such  changes  in  such
document prior to the filing thereof as counsel for such  selling
Holders or underwriters may reasonably request;

          g)   furnish to each selling Holder of Registrable Securities and
the  managing  underwriter, without charge, at least  one  signed
copy   of  the  Registration  Statement  and  any  post-effective
amendments thereto, including financial statements and schedules,
all  documents incorporated therein by reference and all exhibits
(including those incorporated by reference);

          h)   deliver to each selling Holder of Registrable Securities and
the  underwriters, if any, without charge, as many copies of each
Prospectus (and each preliminary prospectus) as such Persons  may
reasonably request (the Company hereby consenting to the  use  of
each  such Prospectus (or preliminary prospectus) by each of  the
selling  Holders of Registrable Securities and the  underwriters,
if  any,  in  connection  with  the  offering  and  sale  of  the
Registrable Securities covered by such Prospectus (or preliminary
prospectus);

          i)   prior to any public offering of Registrable Securities,
register  or  qualify or cooperate with the  selling  Holders  of
Registrable  Securities,  the underwriters,  if  any,  and  their
respective  counsel  in  connection  with  the  registration   or
qualification of such Registrable Securities for offer  and  sale
under  the  securities or blue sky laws of such jurisdictions  as
such selling Holders or underwriters may designate in writing and
do anything else necessary or advisable to enable the disposition
in  such  jurisdictions of the Registrable Securities covered  by
the  Registration Statement; provided that the Company shall  not
be   required  to  qualify  generally  to  do  business  in   any
jurisdiction  where it is not then so qualified or  to  take  any
action  which would subject it to general service of  process  in
any such jurisdiction where it is not then so subject;

          j)   cooperate with the selling Holders of Registrable Securities
and  the  managing underwriter, if any, to facilitate the  timely
preparation   and  delivery  of  certificates  not  bearing   any
restrictive legends representing the Registrable Securities to be
sold  and  cause  such  Registrable  Securities  to  be  in  such
denominations  and  registered in  such  names  as  the  managing
underwriter may request at least three business days prior to any
sale of Registrable Securities to the underwriters;

          k)   use its best efforts to cause the Registrable Securities
covered  by the Registration Statement to be registered  with  or
approved  by  such other governmental agencies or authorities  as
may  be necessary to enable the seller or sellers thereof or  the
underwriters,  if  any,  to consummate the  disposition  of  such
Registrable Securities;

          l)   if the Registration Statement or the Prospectus contains a
Misstatement, prepare a supplement or post-effective amendment to
the  Registration  Statement or the  related  Prospectus  or  any
document  incorporated therein by reference  or  file  any  other
required  document  so  that,  as  thereafter  delivered  to  the
purchasers of the Registrable Securities, the Prospectus will not
contain a Misstatement;

m)   cause all Registrable Securities covered by the Registration
Statement to be listed on any national securities exchange or
authorized for quotation on NASDAQ or in the National Market
System on which Common Stock is then listed or is authorized for
quotation, if requested by the Holders of a majority of such
Registrable Securities or the managing underwriter, if any;
          n)   provide a CUSIP number for all Registrable Securities not
later than the effective date of the Registration Statement;

          o)   enter into such agreements (including an underwriting
agreement) and do anything else necessary or advisable  in  order
to  expedite  or  facilitate the disposition of such  Registrable
Securities,  and  in  such  connection,  whether   or   not   the
registration is an Underwritten Registration:

               (1)  make such representations and warranties to the Holders of
          such Registrable Securities and the underwriters, if any, in
          form, substance and scope as are customarily made by issuers to
          underwriters in primary Underwritten Offerings;
          
               (2)  obtain opinions of counsel to the Company and updates
          thereof (which counsel and opinions (in form, scope and
          substance) shall be reasonably satisfactory to the managing
          underwriter, if any, and the Holders of a majority of the
          Registrable Securities being sold) addressed to each selling
          Holder and the underwriter, if any, covering the matters
          customarily covered in opinions delivered to underwriters in
          primary Underwritten Offerings and such other matters as may be
          reasonably requested by such Holders or underwriters;
          
               (3)  obtain "cold comfort" letters and updates thereof from the
          Company's independent certified public accountants addressed to
          the  selling Holders of Registrable Securities and  the
          underwriters, if any, such letters to be in customary form and
          covering matters of the type customarily covered in "cold
          comfort" letters by underwriters in connection with primary
          Underwritten Offerings;
          
(4)  if an underwriting agreement is entered into, cause the same
to include the indemnification and contribution provisions and
procedures of Section 6 hereof with respect to all parties to be
indemnified pursuant to said Section (or, with respect to the
indemnification of such underwriters, such similar
indemnification and contribution provisions as such underwriters
shall customarily require); and
               (5)  deliver such documents and certificates as may be requested
          by the Holders of a majority of the Registrable Securities being
          sold and the managing underwriter, if any, to evidence compliance
          with clause (1) above and with any customary conditions contained
          in the underwriting agreement or other agreement entered into by
          the Company.
          
The  above  shall be done at each closing under such underwriting
or similar agreement or as and to the extent otherwise reasonably
requested  by  the  Holders  of  a majority  of  the  Registrable
Securities being sold;

          p)   make available for inspection by representatives of the
Holders  of a majority of the Registrable Securities being  sold,
any underwriter participating in any disposition pursuant to such
Registration  Statement, and any attorney or accountant  retained
by  the sellers or any such underwriter, all financial and  other
records and pertinent corporate documents and properties  of  the
Company,   and  cause  the  Company's  officers,  directors   and
employees to supply all information reasonably requested  by  any
such  representative,  underwriter,  attorney  or  accountant  in
connection  with  the Registration; provided  that  any  records,
information  or documents that are designated by the  Company  in
writing  as  confidential  shall be  kept  confidential  by  such
Persons  unless  disclosure  of  such  records,  information   or
documents is required by court or administrative order; and

          q)   otherwise use its best efforts to comply with all applicable
rules and regulations of the SEC, and make generally available to
its   security   holders  earnings  statements   satisfying   the
provisions of Section 11(a) of the Securities Act, no later  than
45 days after the end of any 12-month period (or 90 days, if such
period  is a fiscal year) (x) commencing at the end of any fiscal
quarter  in which Registrable Securities are sold to underwriters
in  an Underwritten Offering, or, if not sold to underwriters  in
such  an  offering,  (y) beginning with the first  month  of  the
Company's  first  fiscal quarter commencing after  the  effective
date  of the Registration Statement, which statements shall cover
said 12-month periods.

          Notwithstanding the foregoing, the Company shall,  upon
written   notice   delivered  to  the  Holders   of   Registrable
Securities, be entitled to postpone the filing or declaration  of
effectiveness of a Registration Statement required or proposed to
be  filed  hereunder (i) upon the happening of any event  of  the
kind  described in Section 4(c)(6), or (ii) if, in the reasonable
determination of the Company, there exists circumstances not  yet
disclosed  to the public, which would be required to be disclosed
in  such Registration Statement and the disclosure of which would
be  materially harmful to the Company.  The Company shall use its
best  efforts  to  minimize the length  of  any  postponement  or
discontinuance  provided  that the Company  may  postpone  for  a
period of sixty (60) days the disclosure of any circumstances if,
in  the  reasonable determination of the Company, such disclosure
would be materially harmful to the Company.

5.   Registration Expenses
     
     (a)   Piggyback Registrations
          
          The   Company  shall  bear  all  Registration  Expenses
incurred in connection with all Piggyback Registrations.

     (b)  Company Expenses
          
          The  Company also will, in any event, pay its  internal
expenses   (including,  without  limitation,  all  salaries   and
expenses  of  its  officers  and employees  performing  legal  or
accounting duties), the expense of any annual audit, the fees and
expenses  incurred  in  connection  with  any  listing   of   the
securities  to  be registered on a securities exchange,  and  the
fees  and  expenses  of  any Person, including  special  experts,
retained by the Company.

6.   Indemnification
     
     (a)  Indemnification by the Company
          
          The  Company agrees to indemnify and hold harmless each
Indemnified Holder from and against all Claims arising out of  or
based  upon  any  Misstatement  or alleged  Misstatement,  except
insofar  as such Misstatement or alleged Misstatement  was  based
upon  information  furnished in writing to  the  Company  by  any
Indemnified  Holder expressly for use in the document  containing
such  Misstatement or alleged Misstatement.  This indemnity shall
not  be exclusive and shall be in addition to any liability which
the Company may otherwise have.

          The foregoing notwithstanding, the Company shall not be
liable  to  the extent that any such Claim arises out  of  or  is
based  upon  a Misstatement or alleged Misstatement made  in  any
preliminary prospectus if (i) such Indemnified Holder  failed  to
send  or  deliver a copy of the Prospectus with or prior  to  the
delivery  of  written  confirmation of the  sale  of  Registrable
Securities  giving  rise to such Claim and  (ii)  the  Prospectus
would have corrected such untrue statement or omission.

          In  addition,  the Company shall not be liable  to  the
extent  that  any  such Claim arises out of or is  based  upon  a
Misstatement or alleged Misstatement in a Prospectus, (x) if such
Misstatement or alleged Misstatement is corrected in an amendment
or  supplement to such Prospectus and (y) having previously  been
furnished  by  or  on behalf of the Company with  copies  of  the
Prospectus as so amended or supplemented, such Indemnified Holder
thereafter  fails  to deliver such Prospectus as  so  amended  or
supplemented prior to or concurrently with the sale to the person
who purchased a Registrable Security from such Indemnified Holder
and who is asserting such Claim.

          The  Company shall also indemnify underwriters, selling
brokers,   dealer   managers  and  similar  securities   industry
professionals  participating  in  a  distribution  covered  by  a
Registration  Statement, their officers and  directors  and  each
Person  who controls such Persons (within the meaning of  Section
15  of  the Securities Act or Section 20 of the Exchange Act)  to
the   same  extent  as  provided  above  with  respect   to   the
indemnification  of  the  Indemnified  Holders   of   Registrable
Securities.

     (b)  Indemnification Procedures
          
          If any action or proceeding (including any governmental
investigation or inquiry) shall be brought or asserted against an
Indemnified  Holder in respect of which indemnity may  be  sought
from  the Company, such Indemnified Holder shall promptly  notify
the  Company in writing, and the Company shall assume the defense
thereof, including the employment of counsel satisfactory to such
Indemnified Holder and the payment of all expenses.

          Such  Indemnified Holder shall have the right to employ
separate  counsel  in any such action and to participate  in  the
defense  thereof,  but  the fees and expenses  of  such  separate
counsel  shall  be the expense of such Indemnified Holder  unless
(i)  the  Company has agreed to pay such fees and expenses,  (ii)
the  Company  shall  have failed to assume the  defense  of  such
action or proceeding or has failed to employ counsel satisfactory
to  such  Indemnified Holder in any such action or proceeding  or
(iii)  the  named  parties  to  any  such  action  or  proceeding
(including  any impleaded parties) include both such  Indemnified
Holder  and  the Company, and such Indemnified Holder shall  have
been  advised  by  counsel that there may be one  or  more  legal
defenses  available to such Indemnified Holder that are different
from or additional to those available to the Company.

          If  such  Indemnified Holder notifies  the  Company  in
writing  that it elects to employ separate counsel at the expense
of  the  Company as permitted by the provisions of the  preceding
paragraph,  the Company shall not have the right  to  assume  the
defense   of  such  action  or  proceeding  on  behalf  of   such
Indemnified  Holder.  The foregoing notwithstanding, the  Company
shall not be liable for the reasonable fees and expenses of  more
than  one  separate  firm  of attorneys  at  any  time  for  such
Indemnified Holder and any other Indemnified Holders (which  firm
shall  be  designated in writing by such Indemnified Holders)  in
connection with any one such action or proceeding or separate but
substantially  similar or related actions or proceedings  in  the
same jurisdiction arising out of the same general allegations  or
circumstances.

          The  Company shall not be liable for any settlement  of
any  such  action  or  proceeding effected  without  its  written
consent, but if settled with its written consent, or if there  be
a  final  judgment  for  the plaintiff  in  any  such  action  or
proceeding,  the  Company agrees to indemnify and  hold  harmless
such  Indemnified Holders from and against any loss or  liability
by reason of such settlement or judgment.

     (c)  Indemnification by Holder of Registrable Securities
          
          Each   Holder  of  Registrable  Securities  agrees   to
indemnify  and  hold  harmless the  Company,  its  directors  and
officers and each Person, if any, who controls the Company within
the meaning of either Section 15 of the Securities Act or Section
20  of  the  Exchange  Act to the same extent  as  the  foregoing
indemnity from the Company to such Holder, but only with  respect
to  information relating to such Holder furnished in  writing  by
such  Holder  expressly  for use in any  Registration  Statement,
Prospectus  or  preliminary prospectus.  In  no  event,  however,
shall   the   liability  hereunder  of  any  selling  Holder   of
Registrable Securities be greater than the dollar amount  of  the
proceeds received by such Holder upon the sale of the Registrable
Securities giving rise to such indemnification obligation.

          In  case  any  action or proceeding  shall  be  brought
against  the  Company or its directors or officers  or  any  such
controlling person, in respect of which indemnity may  be  sought
against  a  Holder of Registrable Securities, such  Holder  shall
have  the rights and duties given the Company and the Company  or
its  directors or officers or such controlling person shall  have
the  rights and duties given to each Holder by Sections 6(a)  and
6(b) above.

          The  Company  shall be entitled to receive  indemnities
from  underwriters, selling brokers, dealer managers and  similar
securities   industry   professionals   participating   in    the
distribution, to the same extent as provided above  with  respect
to   information  so  furnished  in  writing  by   such   Persons
specifically  for  inclusion  in any Prospectus  or  Registration
Statement.

     (d)  Contribution
          
          If  the indemnification provided for in this Section  6
is  unavailable  to an indemnified party under  Section  6(a)  or
Section  6(c) above (other than by reason of exceptions  provided
in  those Sections) in respect of any Claims referred to in  such
Sections,  then each applicable indemnifying party,  in  lieu  of
indemnifying  such  indemnified party, shall  contribute  to  the
amount  paid or payable by such indemnified party as a result  of
such  Claims in such proportion as is appropriate to reflect  the
relative  fault  of  the  Company on the  one  hand  and  of  the
Indemnified Holder on the other in connection with the statements
or  omissions which resulted in such Claims as well as any  other
relevant equitable considerations.  The amount paid or payable by
a  party  as  a result of the Claims referred to above  shall  be
deemed  to  include,  subject to the  limitations  set  forth  in
Section  6(b),  any  legal or other fees or  expenses  reasonably
incurred  by  such  party  in connection  with  investigating  or
defending any action or claim.

          The  relative fault of the Company on the one hand  and
of  the  Indemnified Holder on the other shall be  determined  by
reference  to,  among other things, whether the  Misstatement  or
alleged  Misstatement  relates to  information  supplied  by  the
Company  or  by the Indemnified Holder and the parties'  relative
intent,  knowledge,  access  to information  and  opportunity  to
correct or prevent such Misstatement or alleged Misstatement.

          The  Company and each Holder of Registrable  Securities
agree  that  it  would not be just and equitable if  contribution
pursuant  to  this  Section  6(d) were  determined  by  pro  rata
allocation  or by any other method of allocation which  does  not
take account of the equitable considerations referred to above.

          Notwithstanding the provisions of this Section 6(d), an
Indemnified Holder shall not be required to contribute any amount
in excess of the amount by which (i) the total price at which the
securities  that  were  sold  by  such  Indemnified  Holder   and
distributed to the public were offered to the public exceeds (ii)
the  amount  of  any  damages which such Indemnified  Holder  has
otherwise been required to pay by reason of such Misstatement.

          No   person   guilty  of  fraudulent  misrepresentation
(within the meaning of Section 11(f) of the Securities Act) shall
be entitled to contribution from any person who was not guilty of
such fraudulent misrepresentation.

7.   Exchange Act Reporting Requirements
     
          From   and  after  the  effective  date  of  the  first
registration statement filed by the Company under the  Securities
Act,  the Company shall (whether or not it shall then be required
to  do so) timely file such information, documents and reports as
the Commission may require or prescribe under Section 13 or 15(d)
(whichever is applicable) of the Exchange Act.  In addition,  the
Company  shall  take  such other measures  and  file  such  other
information,  documents  and  reports,  as  shall  hereafter   be
required by the Commission as a condition to the availability  of
Rule  144  under the Securities Act (or any successor  provision)
and the use of Form S-3.

          From  and  after such date, the Company shall forthwith
upon  request furnish any Holder of Registrable Securities (i)  a
written  statement by the Company that it has complied with  such
reporting requirements, (ii) a copy of the most recent annual  or
quarterly report of the Company, and (iii) such other reports and
documents filed by the Company with the Commission as such Holder
may reasonably request in availing itself of an exemption for the
sale  of  Registrable Securities without registration  under  the
Securities Act.

          The  purpose of the foregoing requirements are  (x)  to
enable  any  such  Holder  to  comply  with  the  current  public
information requirements contained in paragraph (c) of  Rule  144
under the Securities Act (or any successor provision) and (y)  to
qualify  the  Company for the use of registration  statements  on
Form S-3.

8.   Requirements for Participation in Underwritten Offerings
     
          No  Person may participate in any Underwritten Offering
pursuant  to  a  Registration hereunder unless  such  Person  (a)
agrees to sell such Person's securities on the basis provided  in
any  underwriting  arrangements approved by the Persons  entitled
hereunder  to  approve such arrangements and  (b)  completes  and
executes  all  questionnaires, powers of  attorney,  indemnities,
underwriting  agreements and other documents required  under  the
terms of such underwriting arrangements.

9.   Suspension of Sales
     
          Upon  receipt  of written notice from the Company  that
(i)   a   Registration   Statement  or  Prospectus   contains   a
Misstatement,  or  (ii) in the reasonable  determination  of  the
Company,  there  exists circumstances not yet  disclosed  to  the
public   which  would  be  required  to  be  disclosed  in   such
Registration  Statement  and the disclosure  of  which  would  be
materially  harmful  to the Company, each Holder  of  Registrable
Securities shall forthwith discontinue disposition of Registrable
Securities  until  such  Holder  has  received  copies   of   the
supplemented  or  amended  Prospectus required  by  Section  4(1)
hereof, or until such Holder is advised in writing by the Company
that  the  use  of  the  Prospectus may be resumed,  and,  if  so
directed by the Company, such Holder shall deliver to the Company
(at  the Company's expense) all copies, other than permanent file
copies  then  in  such  Holder's possession,  of  the  Prospectus
covering  such  Registrable Securities current  at  the  time  of
receipt  of  such notice.  The Company shall use  its  reasonable
best  efforts to minimize the length of such suspension of sales,
provided,  that the Company may require the suspension  of  sales
for  a period of sixty (60) days in the event that the disclosure
of  any  circumstances, in the reasonable  determination  of  the
Company would be materially harmful to the Company.

10.  Miscellaneous
     
     (a)  Remedies
          
          Each  Holder of Registrable Securities, in addition  to
being  entitled  to exercise all rights provided herein,  in  the
Stock  Purchase Agreements and granted by law, including recovery
of  damages,  shall  be entitled to specific performance  of  its
rights  under  this Agreement.  The Company agrees that  monetary
damages  would not be adequate compensation for any loss incurred
by  reason  of a breach by it of the provisions of this Agreement
and hereby agrees to waive the defense in any action for specific
performance that a remedy at law would be adequate.

     (b)  No Inconsistent Agreements
          
          The  Company  shall not on or after the  date  of  this
Agreement enter into any agreement with respect to its securities
that  is  inconsistent with the rights granted to the Holders  of
Registrable  Securities in this Agreement or otherwise  conflicts
with the provisions hereof.

          Except  as  otherwise disclosed to  the  Investor,  the
Company  has  not  previously entered  into  any  agreement  with
respect to its securities granting any registration rights to any
Person.

     (c)  Amendments and Waivers
          
          The   provisions  of  this  Agreement,  including   the
provisions of this sentence, may not be amended, modified or  sup
plemented,  and  waivers  or  consents  to  departures  from  the
provisions  hereof  may  not  be given  unless  the  Company  has
obtained  the  written  consent of the  Holders  of  at  least  a
majority  of  the  outstanding shares of Registrable  Securities.
The  foregoing notwithstanding, a waiver or consent to  departure
from the provisions hereof that relates exclusively to the rights
of  Holders of shares of Registrable Securities whose shares  are
being sold pursuant to a Registration Statement and that does not
directly  or  indirectly affect the rights of  other  Holders  of
shares of Registrable Securities may be given by the Holders of a
majority of the shares of Registrable Securities being sold.

     (d)  Notices
          
          All  notices and other communications provided  for  or
permitted  hereunder shall be made in writing  by  hand-delivery,
registered  first-class mail, telex, telecopier, or  air  courier
guaranteeing overnight delivery:

               i)   if to a Holder of Registrable Securities, at the most
          current address given by such Holder to the Company in accordance
          with the provisions hereof, which address initially is, with
          respect to each Investor, the address set forth in Section 9.2(a)
          of the June Stock Purchase Agreement, with a copy to Reicker,
          Clough, Pfau & Pyle LLP, 1421 State Street, Suite B, Santa
          Barbara, California 93102-1470, Attention: Dan Reicker, Esq.; and
          
               ii)  if to the Company, initially at its address set forth in
          Section 9.2(b) of the June Stock Purchase Agreement and
          thereafter at such other address, notice of which is given in
          accordance with the provisions hereof, with a copy to  with a
          copy to Latham & Watkins, Latham & Watkins, 1001 Pennsylvania
          Avenue, N.W., Suite 1300, Washington, D.C. 20004, Attention:
          Bruce E. Rosenblum, Esq.
          
          All such notices and communications shall be deemed  to
have  been  duly  given:   at  the time  delivered  by  hand,  if
personally delivered; five business days after being deposited in
the  mail,  postage  prepaid, if mailed; when answered  back,  if
telexed;  when receipt acknowledged, if telecopied;  and  on  the
next  business  day,  if  timely  delivered  to  an  air  courier
guaranteeing  overnight  delivery.  The  Company  shall  promptly
provide  a  list of the most current addresses of the Holders  of
Registrable  Securities  given  to  it  in  accordance  with  the
provisions hereof to any such Holder for the purpose of  enabling
such  Holder to communicate with other Holders in connection with
this Agreement.

     (e)  Successors and Assigns
          
          This  Agreement shall inure to the benefit  of  and  be
binding upon the successors and assigns of each of the parties.

     (f)  Counterparts
          
          This  Agreement  may  be  executed  in  any  number  of
counterparts  and by the parties hereto in separate counterparts,
each  of which when so executed shall be deemed to be an original
and all of which taken together shall constitute one and the same
agreement.

     (g)  Table of Contents and Headings
          
          The  table  of contents and headings in this  Agreement
are  for  convenience of reference only and shall  not  limit  or
otherwise affect the meaning hereof.

     (h)  Governing Law
          
          This  Agreement shall be governed by and  construed  in
accordance with the laws of the State of Maryland.

     (i)  Severability
          
          In  the  event  that any one or more of the  provisions
contained herein, or the application thereof in any circumstance,
is held invalid, illegal or unenforceable, the validity, legality
and  enforceability of any such provision in every other  respect
and  of  the remaining provisions contained herein shall  not  be
affected or impaired thereby.

     (j)  Forms
          
          All references in this Agreement to particular forms of
registration  statements are intended to  include  all  successor
forms  which  are  intended to replace, or to  apply  to  similar
transactions as, the forms herein referenced.

     (k)  Entire Agreement
          
          This  Agreement  and the Stock Purchase Agreements  are
intended  by  the respective parties to those agreements  as  the
final  expression of their respective agreement and are  intended
to  be  a  complete and exclusive statement of the agreement  and
understanding  of the parties hereto in respect  of  the  subject
matter  contained  herein.  There are no restrictions,  promises,
warranties  or  undertakings,  other  than  those  set  forth  or
referred  to  herein or therein with respect to the  registration
rights granted by the Company with respect to the securities sold
pursuant  to  the Stock Purchase Agreements.  This Agreement  and
the  Stock Purchase Agreements supersede all prior agreements and
understandings between the parties with respect to  such  subject
matter.

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


                              COMPANY:

                              PERIMMUNE HOLDINGS, INC.

                              By:  /s/MICHAEL G. HANNA
                                                            Name:
Michael G. Hanna
                                                           Title:
President


                              INVESTOR:

                              MENTOR CORPORATION

                              By:  /s/CHRISTOPHER J. CONWAY
                                                            Name:
Christopher J. Conway
                                                           Title:
Chairman, CEO


1.   DEFINITIONS                                                1

2.   PIGGYBACK REGISTRATIONS                                    5
     
     (A)  PARTICIPATION                                         5
     
     (B)  UNDERWRITER'S CUTBACK                                 5
     
     (C)  COMPANY CONTROL                                       6

3.   HOLD-BACK AGREEMENTS                                       6

4.   REGISTRATION PROCEDURES                                    6

5.   REGISTRATION EXPENSES                                     11
     
     (A)  PIGGYBACK REGISTRATIONS                              11
     
     (B)  COMPANY EXPENSES                                     11

6.   INDEMNIFICATION                                           12
     
     (A)  INDEMNIFICATION BY COMPANY                           12
     
     (B)  INDEMNIFICATION PROCEDURES                           13
     
     (C)  INDEMNIFICATION BY HOLDER OF REGISTRABLE SECURITIES  13
     
     (D)  CONTRIBUTION                                         14

7.   EXCHANGE ACT REPORTING REQUIREMENTS                       15

8.   REQUIREMENTS FOR PARTICIPATION IN UNDERWRITTEN OFFERINGS  16

9.   SUSPENSION OF SALES                                       16

10.  MISCELLANEOUS                                             16
     
     (A)  REMEDIES                                             16
     
     (B)  NO INCONSISTENT AGREEMENTS                           17
     
     (C)  AMENDMENTS AND WAIVERS                               17
     
     (D)  NOTICES                                              17
     
     (E)  SUCCESSORS AND ASSIGNS                               18
     
     (F)  COUNTERPARTS                                         18
     
     (G)  TABLE OF CONTENTS AND HEADINGS                       18
     
     (H)  GOVERNING LAW                                        18
     
     (I)  SEVERABILITY                                         18
     
     (J)  FORMS                                                       19
     
     (K)  ENTIRE AGREEMENT                                     19
     
     


                                6
DC_DOCS\84421.8
                     RESEARCH, COLLABORATION
                               AND
                     DISTRIBUTION AGREEMENT
                                
          This Agreement is made and entered into the 22nd day of
December, 1997, by and between PerImmune, Inc., a Delaware
corporation ("PERIMMUNE"), maintaining an office at 1330 Piccard
Drive, Rockville, Maryland 20850-4396 and Mentor Corporation, a
Minnesota corporation ("MENTOR") maintaining an office at 5425
Hollister Avenue, Santa Barbara, CA 93111.

RECITALS

          WHEREAS, PERIMMUNE has developed and refined a method
of treating urological diseases and cancer with a keyhole limpet
hemocyanin composition and is the owner of all rights to
proprietary technical information and the U.S. Patent (as defined
herein) related thereto;

          WHEREAS, PERIMMUNE has advised MENTOR that PERIMMUNE
believes that it can, within a period of three (3) years at a
cost of approximately Three Million Dollars ($3,000,000): (a)
implement and complete a Phase III clinical testing program for
the use of the Product (as defined herein) to treat refractory
bladder cancer, as clinically defined in the PERIMMUNE Phase I/II
protocol and clinical results previously provided to MENTOR
("Refractory Bladder Cancer"), and (b) submit an application for
the use of such Product to the United States Food and Drug
Administration (the "FDA") for the treatment of Refractory
Bladder Cancer;

          WHEREAS, PERIMMUNE and MENTOR desire to enter into an
arrangement pursuant to which MENTOR will fund the costs of
implementing and carrying out the program described in the
preceding recital, and pay certain fees to PERIMMUNE as agreed
milestones in such program are attained, and PERIMMUNE will grant
to MENTOR on the terms and conditions set forth in this agreement
the exclusive worldwide right to market, sell and distribute the
Product for the Indicated Uses (as defined herein);

          WHEREAS, PERIMMUNE and MENTOR agree that, despite the
diligent efforts of PERIMMUNE and MENTOR, there can be no
assurance that the objectives of the Project Development
Activities or the Project Objective (each as defined herein) will
be attained or that the Project Development Activities will
result in commercial use of the Product for any one or more
Indicated Uses.

          NOW, THEREFORE, for and in consideration of the
foregoing and the mutual covenants and agreements contained
herein, and certain other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the
parties agree as follows:

          ARTICLE

DEFINITIONS

          "Affiliate" means, with respect to any Person, any
other Person directly or indirectly controlling or controlled by,
or under common control with, such specified Person.

          "Approvals" means, with respect to any governmental
authority or agency, any or all approvals, clearances,
registrations, licenses, authorizations, visas or permits
required by such governmental authority or agency in order to
import, export, offer for sale, sell, market, manufacture, have
made or use the Product.

          "Competitive Product" means any product constituted
from KLH (as defined herein) that is used in the Indicated Uses.

          "Effective Date" means the date of this Agreement as
set forth above.

          "Indicated Uses" means the use of the Product in all
uro-genital applications, including but not limited to use as an
injectable bio-pharmaceutical to treat cancer of the bladder and
prostate gland and interstitial cystitis.

          "Improvements" means all modifications, variations and
revisions and new models or versions of the Product developed by
the parties hereto which relates or has consequence with respect
to the Product in any of the following ways:  (1) improves the
Product's performance; (2) reduces the cost of materials or
components for the Product; (3) reduces production, manufacturing
or associated costs of the Product; (4) increases the life,
durability or continuous performance characteristics of the
Product; (5) expands the applications to which the Product may be
put; (6) increases or enhances the marketability or commercial
aspect of the Product; or (7) would, if implemented, replace or
displace the Product in one or more material commercial markets
for the Product.  Improvements may be patentable or unpatentable,
and if patentable, need not be patented.

          "Net Sales" means the gross invoiced price for the sale
of Product to purchasers by MENTOR, its agents or Affiliates less
(a) any credits and allowances granted by MENTOR to purchasers
with respect to the Product, including, without limitation,
credits and allowances on account of price adjustments, returns,
discounts and chargebacks, (b) any sales, excise, value-added,
turnover or similar taxes, and (c) transportation, insurance and
handling expenses if separately invoiced and directly chargeable
to such sales.

          "Person" means any individual, corporation,
partnership, association, trust, estate or other entity or
organization, including any governmental entity or authority.

          "Product" means the keyhole limpet hemocyanin
composition ("KLH"), as more particularly described in the
PERIMMUNE Phase I/II protocol and the U.S. Patent (as defined
herein), and any Improvements thereto.

          "Product Patents" means any and all United States
patents and patent applications, all divisionals, continuations,
continuations-in-part, re-issues, extensions or foreign
counterparts thereof, now or hereafter owned or controlled
("controlled" being used in the sense of having the right to
grant licenses thereunder) by PERIMMUNE, covering the
manufacture, use, sale, offer for sale and/or importation of the
Product, including but not limited to, the U.S. Patent No.
5,407,912 attached hereto as Exhibit B.

          "Project Budget" means the budget attached as Exhibit A
to this Agreement, setting forth the estimated costs of carrying
out the Project Development Activities.

          "Project Development Activities" means the program
implemented pursuant to the provisions of this Agreement in order
to accomplish the following objectives in the following order of
priority: (a) the implementation and completion of Phase III
clinical testing of the Product for use in the treatment of
Refractory Bladder Cancer; (b) the preparation and filing of an
application with the FDA on or before June 30, 2000, for the
approval by the FDA of the use of the Product for the treatment
of Refractory Bladder Cancer; (c) obtaining FDA approval for the
use of the Product for the treatment of Refractory Bladder
Cancer; and (d) identifying and establishing contractual
relationships with sources of supply for raw materials required
to manufacture the Product.

          "Project Objective" means the issuance of an approval
by the FDA for the use of the Product in the treatment of
Refractory Bladder Cancer.

          "Product Information" means, individually and
collectively, all manufacturing, analytical and marketing
information and technical know-how, trade secrets and inventions
owned, controlled, conceived and/or reduced to practice and/or
acquired (i) by PERIMMUNE before the date this Agreement, or (ii)
by PERIMMUNE or MENTOR or jointly by the parties during the
Research and Development Period, and directed to the Product,
(whether or not relating to any Indicated Use), including, but
not limited to, specifications for ingredients and formulations,
information relating to regulatory and clinical work, testing or
studies, manufacturing methods and procedures.

          "Project Plan" means the research and development plan
attached hereto as Exhibit A, including the budget, time-lines
and milestones reflected in such Exhibit for carrying out the
Project Development Activities.

          "Quality Specifications" means the quality
specifications for the Product agreed upon by the Joint
Committee, as such quality specifications shall be modified from
time to time by mutual agreement of the parties hereto.

          "Research and Development Period" means the period
commencing on the Effective Date and continuing until the first
to occur of either of the following events: (a) the attainment of
the Project Objective or (b) a joint determination by the parties
hereto that the Project should be discontinued.

          "Target Period" means a period of thirty-six (36)
months, measured from the Effective Date.

          "Vial" means a vial containing the quantity of the
product that is the standard dosage for a single treatment, which
the parties hereto believe is likely to be an quantity between
two (2) and ten (10) mg.

          "U.S. Patent" means United States Patent No. 5,407,912
attached hereto as Exhibit B.

ARTICLE
RESEARCH AND DEVELOPMENT

          Joint Committee.  Promptly upon execution of the
Agreement, PERIMMUNE and MENTOR shall form a Joint Research and
Development Committee (the "Joint Committee") comprising six (6)
members for the purposes of implementing and revising the Project
Plan and coordinating the Project Development Activities to be
conducted by the Project Teams.  Three members of the Joint
Committee (and their successors or replacements, if any) shall be
appointed by PERIMMUNE and three members (and their successors or
replacements, if any) shall be approved by MENTOR.  All actions
of the Joint Committee shall be by a majority vote of all
members.

          Project Teams.  In order to carry out its respective
obligations relating to the Project Development Activities, each
of PERIMMUNE and MENTOR shall assign a defined team of employees
to perform the Project Development Activities (each such team, a
"Project Team" and, together, the "Project Teams").  The initial
PERIMMUNE Project Team shall comprise the individuals listed on
Exhibit C attached hereto and the research technicians under each
of their direction and control.  The initial MENTOR Project Team
shall comprise the individuals listed on Exhibit D attached
hereto and the research technicians under each of their direction
and control.  PERIMMUNE and MENTOR each agree to notify the other
party of any change in the personnel comprising such party's
Project Team, which changes shall remain in the sole discretion
of such party.

          Project Development.  PERIMMUNE will exercise due
diligence in carrying out the Project Development Activities at
the time and in the manner contemplated by the Project Plan, and
endeavoring to achieve the Project Objective.  Each party shall
furnish to the other materials, data, software, specification,
formulas or other information as may, in the sole judgment of the
Joint Committee, be reasonably necessary for the recipient of
such information to perform its Project Development Activities or
other duties hereunder.  Towards this end, the PERIMMUNE Project
Team shall periodically (which, in any event, shall be at least
once every calendar quarter) during the Research and Development
Period, provide to the MENTOR Project Team a written progress
report in form and substance established by the Joint Committee
concerning the Project Development Activities being conducted by
the PERIMMUNE Project Team, which report shall include a summary
of the progress of the Project Development Activities in relation
to the then current Project Budget that has been approved by the
Joint Committee.  Information relating to the Product provided to
a party hereunder shall be governed by Section 10.1.  The parties
agree that, despite the diligent efforts of the parties, there
can be no assurance that the objectives of the Project
Development Activities or the Project Objective will be attained
or that the Project Development Activities will result in
commercial use of the Product for any one or more Indicated Uses.

          Compliance with Regulations.  All activities, studies
or other efforts in furtherance of the Project Development
Activities shall be carried out pursuant to the Project Plan in
strict compliance with any applicable United States Federal,
state or local laws, regulations or guidelines governing the
conduct of such activities, studies or efforts.

          Project Development Costs. The costs and expense of the
Project Development Activities shall be borne and paid by the
parties as follows:

          2.5.1.    Costs Payable by MENTOR.  MENTOR shall
     pay (a) all reasonable costs associated with the
     Project Development Activities as reflected in the
     Project Budget, to the extent that such costs do not
     exceed the sum of $3,000,000, plus (b) the costs of any
     additional work requested by MENTOR that is not within
     the scope of the Project Development Activities (e.g.,
     preparing applications for Approvals of the Product for
     additional Indicated Uses or for jurisdictions other
     than the United States) and (c) the costs of carrying
     out additional clinical testing or other work required
     by the FDA after the submission of the application for
     Approval for the use of the Product to treat Refractory
     Bladder Cancer, to the extent that such additional
     testing or other work was not reasonably within the
     scope of or contemplated by the Project Development
     Activities described in the Project Plan.
     
          2.5.2.    Costs Payable by PERIMMUNE.  Subject to
     the obligations of MENTOR set forth in Section 2.5.1,
     above, PERIMMUNE shall be responsible for and shall pay
     all costs of the Project Development Activities to the
     extent such costs exceed $3,000,000, including the
     costs that would customarily be incurred by a
     manufacturer in the ordinary course of business for the
     purpose of submitting an application for pre-marketing
     approval to the FDA and prosecuting such application to
     completion and the issuance of the Approval applied
     for.
     
          2.5.3.    Time and Manner of Payment.  All amounts
     payable by MENTOR to PERIMMUNE pursuant to this Section
     2.5 shall be payable in advance by wire transfer of
     same day funds on a quarterly basis.  MENTOR shall pay
     the estimated costs of the Project Development
     Activities for the period beginning on the Effective
     Date of this Agreement and ending on March 31, 1998
     concurrently with its execution of this Agreement.
     Thereafter, MENTOR shall pay the estimated costs of the
     Project Development Activities for the next calendar
     quarter within ten (10) days after the start of such
     calendar quarter unless MENTOR is entitled to delay or
     suspend the next quarterly payment as provided by
     Section 2.5.6 of this Agreement.  Amounts not expended
     during any quarter or year shall be carried forward to
     succeeding periods, it being intended that (a) MENTOR
     shall be obligated to expend $3,000,000 during the
     Target Period or until the Project Objective is
     attained, whichever occurs first, and (b) any amounts
     up to $3,000,000 remaining unexpended after the
     attainment of the Project Objective, shall be paid to
     PERIMMUNE as an additional fee.
     
          2.5.4.    Limitation on Obligation.  Except as
     expressly provided by Section 2.5.1, above, MENTOR
     shall not be obligated to pay more than $3,000,000 of
     the costs of the Project Development Activities, and
     PERIMMUNE shall pay all costs and expenses in excess of
     such amount.
     
          2.5.5.    Use of Funds.  PERIMMUNE shall use the
     funds paid by MENTOR pursuant to Section 2.5.3, above,
     only for the payment of the costs and expenses of the
     Project Development Activities.  No portion of any such
     funds shall be used (a) for the payment of PERIMMUNE's
     overhead or general and administrative expenses, except
     to the extent that such expenses have been properly
     allocated to the Project Development Activities at the
     same rate at which such expenses are allocated to all
     other projects and corporate activities of PERIMMUNE,
     or (b) for the acquisition of capital equipment or
     other tangible personal property having a useful life
     in excess of three (3) years.
     
          2.5.6 Right of MENTOR to Suspend Payment.
     PERIMMUNE shall provide to MENTOR from time to time
     such information as MENTOR may reasonably request for
     the purpose of demonstrating that there are sufficient
     funds remaining in the Project Budget and available to
     PERIMMUNE to complete the Project Development
     Activities.  MENTOR shall be entitled to suspend
     payment of costs associated with the Project
     Development Activities if (a) PERIMMUNE fails to submit
     the quarterly report called for by Section 2.3 of this
     Agreement, or (b) any such report evidences that
     (i) PERIMMUNE is not carrying out the Project
     Development Activities in accordance with the terms and
     within the period of time established by the Project
     Plan, or (ii) in MENTOR's reasonable judgment, there
     will be insufficient funds available in the Project
     Budget to attain the Project Objective within the
     Target Period.  Should MENTOR become entitled to
     suspend payments to PERIMMUNE hereunder, then MENTOR
     shall not be required to resume payments until
     PERIMMUNE has taken the corrective action necessary to
     eliminate the cause of such suspension in payments.
     
ARTICLE
DEVELOPMENT FEES PAYABLE TO PERIMMUNE

          Payment Schedule.  In addition to funding the cost of
the Project Development Activities provided in Section 2.5,
MENTOR shall pay to PERIMMUNE as a research and development fee,
an aggregate amount equal to Three Million Dollars ($3,000,000),
payable upon the occurrence of the following events (each, a
"Milestone Event" and the payment in respect of each Milestone
Event, a "Milestone Payment"):  (i) One Million Dollars
($1,000,000)

upon the enrollment of the first patient in Phase III
clinical trials under protocols accepted by the United States
Food and Drug Administration ("FDA") for use of the Product for
an Indicated Use, (ii) One Million Dollars ($1,000,000) upon the
enrollment of the last patient in such Phase III clinical trials,
and (iii) One Million Dollars ($1,000,000) upon obtaining FDA
approval to market and sell the Product for an Indicated Use.

          Manner of Payment.  PERIMMUNE shall provide to MENTOR
written notice of the satisfaction of each Milestone Event.
Promptly upon receipt of such written notice, and, in any event
within five (5) days, thereafter, MENTOR shall pay to PERIMMUNE,
by wire transfer of same day funds, the Milestone Payment in
respect of such Milestone Event.

ARTICLE
OWNERSHIP OF INVENTIONS AND PATENTS

          Ownership of Information.  All Product Information is,
or shall be, owned solely by PERIMMUNE.  Other than as may be set
forth herein, MENTOR shall have  no rights in or to any Project
Information.

          License.  PERIMMUNE hereby grants MENTOR a world-wide,
royalty-free, perpetual, non-exclusive license in the Product
Information, the Product Patents and the Approvals to make, use
and sell the Product for use in the Indicated Uses without any
further duty or obligation to PERIMMUNE.  MENTOR covenants that
it shall not exercise such license except upon the occurrence of
one or more of the circumstances set forth in Section 7.4(i),
7.4(ii), 7.4(iii) or 7.4(iv).

          Ownership of Product Patents and Improvements.
PERIMMUNE shall have sole and exclusive ownership of the Product
Patents and of any Improvements (whether patentable or
unpatentable) made or discovered by PERIMMUNE or MENTOR
separately or by the  parties jointly.  PERIMMUNE shall be
responsible for the preparation, filing and prosecution of
Product Patents as well as all costs and fees associated
therewith.  PERIMMUNE shall apply for, seek prompt issuance of
and maintain during the terms of this Agreement the Product
Patents in all jurisdictions where patent protection is available
and where, in PERIMMUNE's judgment, such patent protection is
necessary or advisable given plans for marketing the Product for
one or more of the Indicated Uses.  The preparation, prosecution
and maintenance of all Product Patents shall be the primary
responsibility of PERIMMUNE; provided however, that MENTOR shall
be afforded reasonable opportunities to advise PERIMMUNE and
shall cooperate with PERIMMUNE in such preparation, prosecution
and maintenance.  PERIMMUNE shall promptly advise MENTOR of the
grant, lapse, revocation, surrender, or any threatened
invalidation or of its intention to abandon any such patent,
application or foreign counterpart.

          Infringement of Product Patents.  PERIMMUNE and MENTOR
shall each promptly notify the other of any infringement of any
Product Patent in any jurisdiction which may come to its
attention.  PERIMMUNE shall promptly undertake reasonable efforts
to obtain a discontinuance of the aforesaid infringement or
unauthorized use.  Any suit to obtain such discontinuance shall
be brought by PERIMMUNE in its name unless the law of the
relevant forum requires otherwise.

ARTICLE
REGULATORY AFFAIRS

          Approvals.  PERIMMUNE shall hold the biological license
application ("BLA") and all other Approvals for the Product.

          Assistance in Gaining Approvals.  PERIMMUNE shall
exercise due diligence in attempting to obtain and in maintaining
in full force and effect the Approval for the marketing and sale
of the Product in the United States for the treatment of
Refractory Bladder Cancer.  At MENTOR's request, PERIMMUNE shall
exercise due diligence in attempting to obtain and in maintaining
in full force and effect the Approvals for the marketing and sale
of the Product (i) for Indicated Uses other than Refractory
Bladder Cancer in the United States and (ii) for Indicated Uses
in Canada, the member states of the European Community, and in
each other jurisdiction in which MENTOR desires to market and
sell the Product for the Indicated Uses, provided that, in each
case, MENTOR shall bear all costs, fees and other expenses
required to be paid to regulatory authorities for the purpose of
applying for, obtaining or preserving such Approvals, provided
further that, in each case, if any application or submission
required to gain such Approvals requires additional clinical
tests or data beyond the clinical tests and data that are
produced during the clinical tests required to gain Approval for
the marketing and sale of the Product in the United States,
MENTOR shall bear all costs of conducting additional clinical
tests and obtaining such additional clinical data, and provided
further that, in each case, MENTOR shall, at no charge to
PERIMMUNE, provide reasonable assistance to PERIMMUNE in making
such applications, submissions or filings as may be required or
advisable to obtain such Approvals.  Notwithstanding anything
else herein to the contrary, PERIMMUNE shall not be required to
attempt to obtain any Approval for the marketing or sale of the
Product for Indicated Uses in any jurisdiction if, in the
reasonable judgment of PERIMMUNE, such efforts separably or in
the aggregate would affect PERIMMUNE's ability to attain the
Project Objective.

          Notice of Reports to Government Authorities.  Each
party shall promptly notify the other party of any information
coming to its attention concerning experience with any Product
for which records and reports are filed with any governmental
authority, but shall not be liable for any intentional failure to
do so.

     ARTICLE

DISTRIBUTION

          Appointment and Acceptance.  PERIMMUNE hereby appoints
MENTOR as its exclusive worldwide distributor of the Product for
the Indicated Uses during the term of this Agreement and MENTOR
agrees to act in this capacity, all subject to the terms and
conditions of this Agreement.  During the term of this Agreement,
(a) neither PERIMMUNE nor any of its Affiliates shall market or
distribute the Product for use in the Indicated Uses, (b)
PERIMMUNE shall not license any other Person to market or
distribute the Product for use in the Indicated Uses, (c)
PERIMMUNE shall not supply to any person other than MENTOR and
its Affiliates Product that indicates on its label or in any
product information sheet or other packaging accompanying the
Product that the Product is suitable for use in the Indicated
Uses, and (d) PERIMMUNE shall not knowingly sell the Product to
persons whom PERIMMUNE knows or has reason to know will use the
Product in the Indicated Uses or will distribute or re-sell the
Product for such uses.

          Terms of Sale.

               MENTOR shall purchase its requirements for the
Product during the term of this Agreement solely from PERIMMUNE
for a purchase price to be calculated as set forth herein and
PERIMMUNE shall use all reasonable best efforts to supply all
such requirements.

               Within thirty (30) days from the date of invoice
for any Product sold to MENTOR, MENTOR shall pay to PERIMMUNE an
amount equal to Thirty Dollars ($30) per Vial of the Product
(such amount, the "Advance").  Additionally, within thirty (30)
days of the close of each calendar quarter in which MENTOR has
purchased Product from PERIMMUNE pursuant hereto, MENTOR shall
pay to PERIMMUNE an amount equal to (i) thirty percent (30%) of
MENTOR's aggregate Net Sales (as defined herein) from the Product
during the calendar quarter (the "Percentage Sales Amount") less
(ii) the aggregate amount equal to (A) the number of Vials sold
during such calendar quarter for which MENTOR has paid to
PERIMMUNE an Advance, multiplied by, (B) the Advance amount (such
aggregate amount, the "Quarterly Advance Amount").  In the event
that the Quarterly Advance Amount in respect of any calendar
quarter shall exceed the Percentage Sales Amount for such
calendar quarter, then the amount payable to PERIMMUNE pursuant
to the preceding sentence shall be zero.  Unless MENTOR and
PERIMMUNE otherwise agree in a writing signed by both of them,
the payment and other provisions set forth in this Agreement
shall supersede those of any subsequent purchase order, sales
confirmation form or other document hereafter sent by either
party hereto to the other.

               Within thirty (30) days after the end of each
calendar quarter in which MENTOR has purchased any Product from
PERIMMUNE, MENTOR shall submit a report to PERIMMUNE certified by
a financial officer of MENTOR and setting forth, with respect to
such calendar quarter, (i) the aggregate number of Vials of
Product purchased from PERIMMUNE, (ii) the aggregate number of
Vials of Product sold by MENTOR, (iii) 30% of MENTOR's aggregate
Net Sales from the Product and (iv) the aggregate Advances paid
by MENTOR to PERIMMUNE with respect to the Vials of the Product
sold by MENTOR.  Upon thirty (30) days notice to MENTOR,
PERIMMUNE shall have the right to examine the applicable books
and records of MENTOR in order to verify the payments made to
PERIMMUNE pursuant to Section 6.2(b) above.  In the event that
any such examination reveals that the amount of such payments
owed to PERIMMUNE for any calendar quarter shall be different
than the amount certified to PERIMMUNE with respect to such
calendar quarter and paid to PERIMMUNE pursuant to Section
6.2(b), then, any shortfall shall promptly be paid to PERIMMUNE
and, alternatively, any overpayment shall promptly be re-paid to
MENTOR, in each case, without interest on such payment.  For
purposes of this Section 6.2(c), MENTOR shall maintain such books
and records for not less than three years after the relevant
date.

               Title and risk of loss with respect to the Product
sold by PERIMMUNE to MENTOR shall pass to MENTOR upon release of
Product for shipment by PERIMMUNE to the designated carrier.
MENTOR shall specify the method of shipment and insurance and all
freight and applicable insurance charges shall be the
responsibility of MENTOR.  PERIMMUNE will be responsible for
contracting freight services specified by MENTOR, for which
MENTOR will be billed on a shipment-by-shipment basis.  The
Product is subject to inspection and acceptance by MENTOR upon
receipt.  MENTOR shall be deemed to have accepted each shipment
of the Product unless rejected for non-conformity with the
Quality Specifications (as defined herein) in accordance with
Section 6.5 of this Agreement, within twenty (20) working days
after receipt of shipments from PERIMMUNE.

               Unless approved by MENTOR in writing, PERIMMUNE
will not sell any Product to MENTOR that has a shelf-life from
the date of shipment by PERIMMUNE that is less than the greater
of (a) twelve (12) months or (b) such longer period for which
PERIMMUNE has obtained stability approval from the FDA.

          MENTOR's Duties.  MENTOR shall:

               use best commercial efforts to advertise and
promote the sale of the Product in a manner calculated by MENTOR
to yield benefit to the parties hereto.  MENTOR agrees that
during the term of this Agreement, it will not market any
Competitive Product.

               submit its purchase orders to PERIMMUNE in writing
or via facsimile, signed by an authorized representative of
MENTOR.

               pay all PERIMMUNE invoices in United States
currency by company check or by electronic wire transfer to an
account designated by PERIMMUNE.

               submit to PERIMMUNE a twelve (12) month forecast
of purchases of Product from PERIMMUNE and delivery dates for
such Product, which forecast shall not constitute a firm purchase
commitment, in a format to be mutually determined by the parties.
Said forecast shall be submitted by MENTOR to PERIMMUNE within
thirty (30) days after gaining FDA approval for use in the
Indicated Uses, and quarterly thereafter.  MENTOR shall place
firm orders from time to time for the purchase of the Product at
least ninety (90) days in advance of required delivery.

               obtain advance written authorization and a
Returned Material Authorization ("RMA") prior to returning any of
the Product.

               maintain a properly trained sales force of
adequate size to represent and promote the sale of the Product
and provide instructions to customers in the use of the Product.
MENTOR shall be responsible for developing its own marketing plan
and system for dispensing the Product.

               carry in stock an inventory of the Product
sufficient to promptly fill the orders of MENTOR's customers.

               pay any import duty or like charge on the entry of
the Product into any jurisdiction and any local or other
applicable taxes.

               maintain separate and detailed accurate and
complete records of all transactions in respect of the Product,
including, but not limited to, such records as identify all
customer purchases by Product and serial and/or lot number, and
possess the capability to notify all purchasers in the event of a
Product recall or corrective action.

               defray all expenses of and incidental to the
distribution and sale of the Product hereunder incurred by
MENTOR.

               make no contracts or commitments on behalf of
PERIMMUNE or make any promises or representations or give any
warranties or guarantees with respect to the Product except as
herein expressly permitted or otherwise incur any liability on
behalf of PERIMMUNE without PERIMMUNE's prior written consent,
nor represent itself as agent or partner of PERIMMUNE.

               comply with all laws and regulations and
requirements applicable to a seller of bio-pharmaceutical
products, and with all laws and regulations and requirements of
governmental agencies in any jurisdiction in which it markets,
distributes or sells the Product.

               except as authorized in writing by PERIMMUNE,
refrain absolutely from using the trademark or trade name and
logo of PERIMMUNE in connection with the marketing, distribution
and sale of any Product.

          PERIMMUNE's Duties.  PERIMMUNE shall:

               make reasonable best efforts, in good faith, to
deliver MENTOR's firm orders for the Product within ninety (90)
days from date of order receipt, provided that if PERIMMUNE is
unable to deliver such firm orders within such ninety (90) day
period, PERIMMUNE will give priority to the delivery of the
Product to MENTOR to deliver such firm order, over the delivery
of the Product to any other purchaser or distributor, until such
firm orders are filled.  MENTOR shall specify the method of
shipment and insurance and PERIMMUNE shall make reasonable best
efforts, in good faith, to comply with such specifications.  If
no such specification is made, or if the specification cannot be
reasonably complied with after notice to MENTOR and an
opportunity to resolve the issues surrounding PERIMMUNE's alleged
inability to comply, PERIMMUNE may select a reasonable manner of
shipment and insurance, the cost of which shall be the
responsibility of MENTOR as provided in Section 6.2(d).

               afford all purchase orders for the Product
received from MENTOR equal priority with PERIMMUNE's own supply
requirements for (a) products that PERIMMUNE distributes for its
own account and (b) orders from distributors of other products
manufactured by or for PERIMMUNE.  PERIMMUNE will ship all orders
for the Product and for other products manufactured by or for
PERIMMUNE in the priority in which such orders were received.

               provide such amount of Product as MENTOR
reasonably requests for use by MENTOR for promotional purposes,
to MENTOR, at PERIMMUNE's cost plus shipping charges.

               comply with all laws and regulations and
requirements applicable to PERIMMUNE as a manufacturer of bio-
pharmaceutical products.

               except as authorized in writing by MENTOR, refrain
absolutely from using the trademark or trade name and logo of
MENTOR in connection with the marketing, distribution and sale of
any Product.

               supply the Product to MENTOR in Vials, pre-labeled
with labels of a design provided by MENTOR.  MENTOR shall supply
PERIMMUNE with camera-ready artwork for such labels.

               provide reasonable technical assistance to
MENTOR's personnel necessary for the marketing of the Product.

               at PERIMMUNE's expense, provide MENTOR with
written product inserts relating to the Product's use, and with
such amendments thereto as subsequently become available.

               provide necessary documentation to assist MENTOR
in meeting requirements to register the Product in any
jurisdiction where MENTOR reasonably expects to market the
product for sale, and, where possible, allow MENTOR to utilize
prior registrations by PERIMMUNE.

               provide MENTOR with copies of the BLA pre-market
notifications submitted for the Product, copies of current
package inserts for the Product, copies of documents describing
specifications for the Product, and copies of all current and
future correspondence with the FDA pertaining to the Product for
any Indicated Use.  PERIMMUNE will comply with the FDA's current
good manufacturing practices and regulations ("GMP") in the
manufacture of the Product.  If needed to comply with any change
in the law or FDA's GMP regulations or policies, or to enable
MENTOR to market and distribute the Product in any jurisdiction
MENTOR shall have the right to inspect PERIMMUNE's manufacturing
facilities and GMP records pertaining to the manufacture of the
Product.  If any action should be taken by the FDA to restrict or
prevent the distribution of the Product for any Indicated Use for
more than thirty (30) days, and such restriction is not due to
the negligence of MENTOR, then upon notice to PERIMMUNE, MENTOR
shall have the right to terminate this Agreement as to such use
or uses of the Product.  PERIMMUNE shall replace any affected
inventory of Product under this section or refund to MENTOR the
purchase price it paid to PERIMMUNE for such inventory if
PERIMMUNE is unable to replace the Product with comparable
inventory.  PERIMMUNE shall replace or repurchase any affected
inventory of Product which MENTOR replaces or repurchases from
MENTOR's customers, at the price MENTOR paid PERIMMUNE for such
inventory.  IN NO CASE SHALL PERIMMUNE BE LIABLE FOR
CONSEQUENTIAL OR INCIDENTAL DAMAGES.

               comply with the United States Food, Drug and
Cosmetic Act.  The Product comprising each shipment or other
delivery hereafter made by PERIMMUNE to, or on the order of,
MENTOR, as of the date of such shipment or delivery, shall not,
on such date be, adulterated or misbranded within the meaning of
the United States Food, Drug, and Cosmetic Act.

               use raw materials that comply with any applicable
raw material specification guidance documents promulgated by the
FDA.

               use manufacturing procedures that comply with all
applicable GMP standards.

               provide MENTOR with Product that is suitable for
use for its intended purpose.

               issue an RMA to MENTOR promptly upon its receipt
of a request therefor, unless a reasonable basis exists for
denying such request, it being understood by the parties hereto
that, the failure of MENTOR to reject a Product within twenty
(20) working days of receipt of the Product shall not constitute
a reasonable basis for denying such request.

               (i) consult with MENTOR regarding proposed changes
to the Product and/or the adaptation of the Product for addition
applications within the Indicated Uses, (ii) make such
Improvements to the Product as may be reasonably necessary to
meet the needs of the market and to keep the Product current and
commercially acceptable, and (iii) make reasonable efforts
consistent with its available resources and its other contractual
commitments and business objectives to incorporate into the
Product any features or Improvements that are recommended by
MENTOR as the result of its clinical studies and its marketing
and customer support activities, to the extent that such
Improvements are technically and economically feasible.  MENTOR
shall pay a reasonable consulting fee and reasonable costs
incurred by PERIMMUNE, in each case, in an amount mutually
agreeable to the parties, in connection with any research or
development activities that PERIMMUNE undertakes at the request
of MENTOR pursuant to this Section 6.4(p).

               if MENTOR exercises its right to terminate this
Agreement pursuant to Section 7.2.1, take reasonable steps,
consistent with the orderly termination of the Project, to reduce
or eliminate as soon as reasonably practicable the costs for
which MENTOR will continue to be responsible under Section 7.2 of
this Agreement, to the extent that PERIMMUNE can do so without
breaching existing contractual obligations or otherwise incurring
liability for wrongful conduct.

          Performance Standards.

               Quality Specifications and Characteristics.
PERIMMUNE shall deliver to MENTOR Product having the Quality
Specifications.

               Certificate of Analysis.  Concurrent with
shipment, PERIMMUNE shall fax to MENTOR a Certificate of
Analysis, in the form set forth in Exhibit E hereto, of each lot
of Product sold to MENTOR, confirming that the Product meets the
Quality Specifications.

               Product Acceptance.  Within twenty (20) working
days of receipt of Product, MENTOR shall take and conduct
analysis of sample of the Product delivered by PERIMMUNE.  Should
the result of an analysis of such sample deviate from the Quality
Specifications, MENTOR shall notify PERIMMUNE in accordance with
Section 10.2 hereof and immediately thereafter provide PERIMMUNE
with samples of the Product tested.  If, following a review of
the test result and after conducting its own tests of the sample,
PERIMMUNE agrees that such sample does not conform to the Quality
Specifications, PERIMMUNE shall provide to MENTOR, free of any
additional charge, new deliveries of the same quantity of the
Product as the one from which the sample was taken, or in
PERIMMUNE's discretion and at its cost, PERIMMUNE may promptly
reprocess the nonconforming Product to meet the Quality
Specifications.  In either event, MENTOR shall return, at
PERIMMUNE's expense, the particular lot or shipment of the
Product which does not comply with the Quality Specifications if
requested to do so by PERIMMUNE.

          Product Recall.

               Either party shall immediately notify the other
party in writing should it become aware of any defect or
condition that renders any lot(s) of Product supplied by
PERIMMUNE to MENTOR in violation of the United States Food, Drug
and Cosmetic Act, or of a similar law of any jurisdiction or
country where the Product is sold.  Should either party
experience any quality problem involving field correction or
recall of any specific lot(s) of Product supplied to MENTOR by
PERIMMUNE, such party shall notify the other in writing by
facsimile within twenty-four (24) hours of the initiation of the
field correction or recall.  Each party will test retained
samples of lots in question and report its findings to the other
within ten (10) working days.

               Each party shall keep the other informed of any
formal action relating to any specific lot of Product sold to
MENTOR hereunder by a regulatory agency of any state, national
government, or government agency having jurisdiction.

               Should any governmental action or other
circumstances require the recall or field corrections or
withholding from market of Product sold by PERIMMUNE to MENTOR,
each party retains the right and obligation to correct field
problems arising out of its fault or omission as it deems
appropriate, with or without the concurrence of the other.  All
information about complaints concerning the Product shall be
considered "Confidential Information" under the terms of this
Agreement.  MENTOR shall bear all costs of complying or effecting
any recall or field correction, including the cost of the Product
and the actual costs of replacing the Product, that is the result
of any fault or omission attributable to MENTOR.  PERIMMUNE shall
bear all costs of complying or effecting any recall or field
correction, including the cost of the Product and the actual
costs of replacing the Product, that (i) is the result of any
fault or omission attributable to PERIMMUNE or (ii) results from
the fault of neither party.  Should such recall or field
correction result from the fault of both parties, the parties
shall share all costs of complying or effecting any recall or
field correction, including the costs of the Product and the
actual cost of replacing the Product, in proportion to their
respective degree of fault.

          Product Complaints.

               PERIMMUNE shall maintain an appropriate record of
all claims made or to be made regarding the Product's
performance.  The parties shall share with each other all data on
confirmed lot-specific Product complaints including, but not
limited to, complaints or information regarding performance
and/or allegations or reports of any negative effect from the use
or misuse of such affected lot of Product as soon as such data is
available.  Each party will provide reasonable assistance to the
other in resolving customer complaints to the extent the
complaint arises out of any fault or omission of the party whose
assistance is requested.  However, MENTOR shall have sole
responsibility and authority to interact directly with MENTOR's
customers in the resolution of such complaints and PERIMMUNE
agrees that it will only interact with MENTOR in such matters.

               PERIMMUNE shall evaluate and investigate all
customer complaints in connection with the Product which may be
brought to its attention, in writing, by MENTOR, provided that
such complaints (i) have been confirmed by MENTOR's QA/QC or
technical service personnel using the same standards for
confirmation which MENTOR uses for products other than the
Product and (ii) are believed in good faith by MENTOR to arise
out of a fault or omission attributable to PERIMMUNE.  Within
twenty (20) calendar days following receipt from MENTOR of the
original notification of each such complaint, PERIMMUNE agrees to
provide MENTOR with a written interim or final complaint
investigation report.  All such Product complaints reported to
PERIMMUNE by MENTOR shall be reviewed monthly by PERIMMUNE until
closure, and a summary report thereof will be provided by
PERIMMUNE to MENTOR.

               PERIMMUNE will report to MENTOR all data and/or
information pertaining to adverse reports on any lot of Product
supplied by PERIMMUNE for distribution by MENTOR which would have
a adverse impact on performance of the Product.

               Should there be a difference of opinion between
PERIMMUNE and MENTOR regarding whether a field notification or
recall is necessary, MENTOR will exercise the right to notify its
customers without delay.

          Packaging and Intellectual Property.  MENTOR shall be
responsible for repackaging the Product in such form as is
suitable and in compliance with all applicable laws for resale in
each jurisdiction in which the Product is sold.  MENTOR will
distribute the Product only with all appropriate labeling,
packaging and Product literature and only under MENTOR's
applicable trademarks and trade names.  MENTOR recognizes
PERIMMUNE's right, title and interest in its patents (including
all Product Patents), trademarks, trade names and copyrights,
trade secrets and proprietary information in connection with the
Product and MENTOR shall not claim any ownership right thereto
inconsistent with this Agreement, or dispute the validity
thereof.  In the event any third party shall contest PERIMMUNE's
rights to its patents, trademarks, trade names or copyrights,
trade secrets or proprietary rights, MENTOR shall, at PERIMMUNE's
sole expense, render reasonable assistance to PERIMMUNE in
defending such claims.

          Product Modifications.  PERIMMUNE reserves the right,
from time to time, to modify the Product or to make any
Improvement, and shall give MENTOR at least three (3) months
prior written notice before making any Improvement or change to
its manufacturing process for the Product that would have an
impact on any of PERIMMUNE's product verifications or
validations, or changes in raw materials that would alter the use
of the Product for any Indicated Use or other change or
Improvement that could impact product labeling or promotional
literature; provided, however, that PERIMMUNE shall be required
to provide MENTOR with only reasonable advance notice where such
modification or Improvement is required to comply with any
applicable legal or regulatory requirement or the unanticipated
modification or unavailability of raw material.

          Appointment of Sub-Distributors.  MENTOR may assign,
sublicense, delegate, or otherwise transfer the performance of
the rights and obligations hereunder to qualified and reputable
sub-distributors, provided, however, that:  (i) MENTOR shall be
liable to PERIMMUNE for the errors, negligent acts and omissions
of its sub-distributors as if such errors, negligent acts and
omissions were its own, including any breach of any provision of
this Agreement by the sub-distributors; (ii) MENTOR shall have
and retain full control of any sub-distributor utilized, and
shall be responsible for the performance by any sub-distributor;
and (iii) MENTOR shall not be relieved of the responsibility for
the proper performance and completion of the sub-distributed
portions of its obligations hereunder.

ARTICLE
TERM AND TERMINATION

          Term.  This Agreement shall be in full force and effect
in each applicable jurisdiction, and for each applicable
Indication Use, for a period commencing on the Effective Date and
continuing for a period equal to ten (10) years following the
obtaining of the first Approval of the Product for such Indicated
Use in such jurisdiction, provided that, MENTOR shall have the
right to terminate this agreement with respect to any such
Indicated Use in any such jurisdiction at the expiration of five
(5) years from the date of such Approval in such jurisdiction by
giving not less than one-hundred and eighty (180) days written
notice to PERIMMUNE of its intention to so terminate.

          Termination.

               Termination by MENTOR Without Cause.  MENTOR shall
be entitled to terminate this Agreement without cause at any time
prior to attainment of the Project Objective by giving PERIMMUNE
not less than one-hundred and eighty (180) days prior written
notice of intention to terminate, specifying the effective date
of termination, if MENTOR reasonably concludes that the Project
Objective cannot be attained within the Target Period, for a
reason other than excusable delay and events of force majeure, at
a cost that does not exceed the Project Budget as adjusted by the
parties as described herein.  Should MENTOR exercise the
termination right conferred by this Section 7.1, then:

                    MENTOR shall remain liable for the
     payment of any costs or expenses that PERIMMUNE
     reasonably incurs in the winding down and terminating
     of the Project Development Activities, including
     amounts payable pursuant to contracts and agreements
     entered into by PERIMMUNE prior to receiving notice of
     intention to terminate, provided that nothing in this
     Section 7.2.1(i) shall cause MENTOR to be liable for
     obligations of PERIMMUNE under contracts with
     institutions acting as investigators in the clinical
     trials conducted pursuant to this Agreement, which
     obligations are inconsistent with current industry
     practice in the conduct of clinical trials.
     
                    MENTOR shall not have the right to the
     return of any funds previously expended by it pursuant
     to this Agreement; and
     
                    MENTOR shall have no rights in the
     Product or the Project Information and PERIMMUNE shall
     be free to license the right to manufacture, market and
     sell the Product to any other persons as PERIMMUNE may
     select without further duty or obligation to MENTOR.
     
               Termination by MENTOR With Cause.  MENTOR shall be
entitled to terminate this Agreement for cause by giving
PERIMMUNE written notice of intention to terminate, specifying
the effective date of termination not less than ninety (90) days
prior to the effective date of termination, upon the occurrence
of any of the following events:

                    PERIMMUNE commits a material breach of
     its obligations under this Agreement and such material
     breach remains uncured for a period of ninety (90) days
     after written notice of such default, specifying the
     nature thereof, has been given to PERIMMUNE, unless,
     prior to the expiration of such ninety (90) day period,
     PERIMMUNE has commenced, and thereafter pursues with
     diligence to completion, those actions necessary to
     cure such default within a reasonable period of time.
     
                    PERIMMUNE becomes insolvent or has a
     receiver, liquidator, trustee or assignee in bankruptcy
     or insolvency appointed, in each case whether by the
     voluntary act or otherwise, and, in the case of any
     such proceeding that is involuntary, if such proceeding
     is not terminated within thirty (30) days thereafter.
     
                    An order is made or a resolution is
     passed for the winding up or liquidation of PERIMMUNE.
     
               Termination by PERIMMUNE With Cause.  PERIMMUNE
shall be entitled to terminate this Agreement for cause by giving
MENTOR written notice of intention to terminate, specifying the
effective date of termination not less than ninety (90) days
prior to the effective date of termination, upon the occurrence
of any of the following events:

                    MENTOR commits a material breach of its
     obligations under this Agreement and such material
     breach remains uncured for a period of ninety (90) days
     after written notice of such default, specifying the
     nature thereof, has been given to MENTOR, unless, prior
     to the expiration of such ninety (90) day period,
     MENTOR has commenced, and thereafter pursues with
     diligence to completion, those actions necessary to
     cure such default within a reasonable period of time.
     
                    MENTOR becomes insolvent or has a
     receiver, liquidator, trustee or assignee in bankruptcy
     or insolvency appointed, in each case whether by the
     voluntary act or otherwise, and, in the case of any
     such proceeding that is involuntary, if such proceeding
     is not terminated within thirty (30) days thereafter.
     
                    An order is made or a resolution is
     passed for the winding up or liquidation of MENTOR.
     
          Procedures on Termination.  Upon termination of this
Agreement:

               each party shall return to the other party all
Confidential Information (as defined herein) which such other
party shall have supplied to the party and which is in the
party's possession.

               the rights and duties of each party under this
Agreement in respect of performance prior to termination shall
survive and be enforceable in accordance with the terms of this
Agreement.

               within thirty (30) days of receipt of PERIMMUNE's
invoice therefor, MENTOR will pay PERIMMUNE for all remaining
inventory of the Product for which MENTOR has issued purchase
orders to PERIMMUNE.  Upon payment, PERIMMUNE will ship such
inventory to MENTOR at MENTOR's expense, and MENTOR shall be
entitled to continue to market and sell the Product until
MENTOR's inventory of the Product has been disposed of.

               If this Agreement has been terminated by reason of
a material breach by PERIMMUNE, adjudicated as provided by
Section 7.4(iv), PERIMMUNE shall continue to be bound by the
provisions of Section 6.1 of this Agreement for the same period
of time during which PERIMMUNE would have been bound had such
termination not occurred.

          Procedures on PERIMMUNE's Discontinuance of
Manufacture.  MENTOR shall have the right to exercise the license
granted pursuant to Section 4.2, above, if PERIMMUNE (i) abandons
the Project Development Activities without the concurrence of
MENTOR; (ii) discontinues manufacturing the product for valid
business reasons that cannot be remedied within a reasonable
period of time; (iii) is otherwise unable to supply the
requirements of MENTOR for the Product on forecasted delivery
dates, as such requirements and delivery dates are set forth in
the twelve (12) month forecast of purchases submitted by MENTOR
to PERIMMUNE pursuant to Section 6.3(d) of this Agreement for a
period of two successive quarters; or (iv) is in material breach
of this Agreement, which material breach has been determined by a
court of law, which determination has become final and not
subject to further appeal.  Upon the occurrence of any such
event, PERIMMUNE shall transfer to MENTOR any necessary
technology, knowledge, know-how, and the rights to the Approvals
for the Product for use in the Indicated Uses, to the extent
necessary or appropriate to enable MENTOR or its alternate
supplier to exercise the license granted under Section 4.2.
MENTOR shall reimburse PERIMMUNE the reasonable out-of-pocket
costs PERIMMUNE incurs in doing so (including salary benefits for
time expended by PERIMMUNE employees) immediately upon receipt of
an invoice therefor.  If any such event occurs before the
issuance of an Approval for an Indicated Use, then PERIMMUNE
shall transfer to MENTOR all Project Information relating to such
Indicated Use.

ARTICLE
WARRANTIES

          Representations and Warranties of MENTOR.  MENTOR
hereby makes the following representations and warranties to
PERIMMUNE, which representations and warranties are true and
correct on the date hereof:

               MENTOR is a corporation duly organized, validly
existing and in good standing under the laws of the state of
Minnesota and has all requisite corporate power and authority to
enter into this Agreement and perform its obligations hereunder.

               Neither the execution or delivery of this
Agreement, nor the consummation of the transactions contemplated
herein, will (a) violate or conflict with any provision of the
Certificate of Incorporation or By-laws of MENTOR, each as in
effect on the Effective Date; (b) with or without the giving of
notice of the lapse of time or both (i) result in a breach of, or
violate, or be in conflict with or constitute a default under, or
result in the termination or cancellation of, or accelerate the
performance required under, any security instrument, mortgage,
note, debenture, indenture, loan, lease contract, agreement or
other instrument, to which MENTOR is a party or by which it or
any of its properties or assets may be bound or affected, or (ii)
result in the loss or adverse modification of any lease,
franchise, license or other contractual right or other
authorization granted to or otherwise held by MENTOR; (c) require
the consent of any party to any such agreement or commitment to
which MENTOR is a party or by which any of its properties or
assets are bound; (d) result in the creation or imposition of any
lien, claim or encumbrance upon any property or assets of MENTOR;
or (e) require any consent, approval, authorization, order,
filing, registration or qualification of or with any court or
governmental authority or arbitrator to which MENTOR is subject
or by which any of its properties or assets may be bound or
affected, other than Approvals of the Product for the Indicated
Uses, as contemplated herein.

               All action to authorize the execution and delivery
of this Agreement and the consummation of the transactions
contemplated herein have been duly taken, and this Agreement
constitutes the valid and binding obligation of MENTOR
enforceable in accordance with its terms.

               There are no claims relating to patent
infringement or any other matters, actions, suits, proceedings,
arbitrations or investigations pending or, to the best of
MENTOR's knowledge, threatened, against MENTOR which if adversely
determined would adversely affect MENTOR's ability to sell the
Product for any Indicated Use, or MENTOR's ability to conduct
Product Development or to enter into or carry out this Agreement.

          Representations and Warranties of PERIMMUNE.  PERIMMUNE
hereby makes the following representations and warranties to
MENTOR, which representations and warranties are true and correct
on the date hereof.

               PERIMMUNE is a corporation duly organized, validly
existing and in good standing under the laws of the state of
Delaware and has the power and authority to enter into this
Agreement and perform its obligations hereunder.

               Neither the execution or delivery of this
Agreement, nor the consummation of the transactions contemplated
herein, will (a) violate or conflict with any provision of the
Certificate of Incorporation or By-laws of PERIMMUNE, each as in
effect on the  Effective Date; (b) with or without the giving of
notice of the lapse of time or both (i) result in a breach of, or
violate, or be in conflict with or constitute a default under, or
result in the termination or cancellation of, or accelerate the
performance required under, any security instrument, mortgage,
note, debenture, indenture, loan, lease contract, agreement or
other instrument, to which PERIMMUNE is a party or by which it or
any of its properties or assets may be bound or affected, or (ii)
result in the loss or adverse modification of any lease,
franchise, license or other contractual right or other
authorization granted to or otherwise held by PERIMMUNE; (c)
require the consent of any party to any such agreement or
commitment to which PERIMMUNE is a party or by which any of its
properties or assets are bound; (d) result in the creation or
imposition of any lien, claim or encumbrance upon any property or
assets of PERIMMUNE; or (e) require any consent, approval,
authorization, order, filing, registration or qualification of or
with any court or governmental authority or arbitrator to which
PERIMMUNE is subject or by which any of its properties or assets
may be bound or affected, other than Approvals of the Product for
the Indicated Uses, as contemplated herein.

               All action to authorize the execution and delivery
of this Agreement and the consummation of the transactions
contemplated herein have been duly taken, and this Agreement
constitutes the valid and binding obligation of PERIMMUNE
enforceable in accordance with its terms.

               There are no claims relating to patent
infringement or any other matters, actions, suits, proceedings,
arbitrations or investigations pending or, to the best of
PERIMMUNE's knowledge, threatened, against PERIMMUNE which if
adversely determined would adversely affect the use of the
Product for any Indicated Use, or PERIMMUNE's ability to enter
into or carry out this Agreement.

               PERIMMUNE, after having made a reasonable
investigation and obtaining the advice of its counsel, (i) has no
knowledge that the manufacture, use, importation or sale of the
Product for the Indicated Uses under this Agreement, either alone
or in combination, infringes any patent or other industrial
property right of a third party; and (ii) has not received any
notification from any third party alleging or suggesting that the
manufacture, use, importation or sale of the Product does or
would infringe any patent or other industrial property.
PERIMMUNE shall disclose to MENTOR any information regarding
adverse patent rights of which it is, or becomes, aware relating
to the Product.

ARTICLE
INDEMNIFICATION

          PERIMMUNE Indemnification.  PERIMMUNE shall defend,
indemnify and hold harmless MENTOR and its directors, employees,
representatives and agents from and against all suits, claims,
liabilities, damages, demands and costs (including, but not
limited to, reasonable legal expenses) ("Claims") incurred as a
result of:

               any claims of or on behalf of third parties for
death or personal injury resulting from the Product; provided,
however, that this indemnity shall not apply to, and PERIMMUNE
shall not be liable for, any such claim caused by or arising
from:

                    any act or failure on the part of
     MENTOR, its Affiliates, or their respective employees,
     representatives, agents or subsidiaries (the "MENTOR
     Parties") in packaging, handling, storing or otherwise
     distributing the Product;
     
                    any representation or warranty
     concerning the Product made by or on behalf of MENTOR
     or any MENTOR Party and not specifically authorized by
     PERIMMUNE;
     
                    any claim resulting from the use of the
     Product by any customer that was not in accordance with
     the use presented by PERIMMUNE;
     
                    MENTOR's failure to disseminate to
     purchasers or end-users any Product information which
     PERIMMUNE has made available to MENTOR;
     
                    any claim where PERIMMUNE has not been
     notified in writing within forty five (45) days of
     MENTOR's first notice of this claim;
     
                    any claim where MENTOR fails to furnish
     evidence in its possession or fails to fully cooperate
     with PERIMMUNE in preparing the defense;
     
               any claim that the Product or any activities
hereunder infringe the patent or other intellectual property
rights of any third party provided MENTOR gives PERIMMUNE notice
within forty-five (45) days of MENTOR's first notice of the
claim; provided, however, that the claim is not based on (i) the
sale or use of the Product in combination with any other product
which is not specifically authorized by PERIMMUNE in writing; and

               PERIMMUNE's material breach of the terms of this
Agreement.

          MENTOR Indemnification.  MENTOR shall defend, indemnify
and hold harmless PERIMMUNE and its directors, employees,
representatives and agents from and against all Claims incurred
as a result of:

               MENTOR's material breach of the terms of this
Agreement.

          Indemnification Proceedings.

               Notice of Claims:  Assumption of Defense.  The
party to be indemnified ("the Indemnified Party") shall give
prompt notice to the other party ("the Indemnifying Party") of
the assertion of any Claim in respect of which indemnity may be
sought hereunder (and in any event within fifteen (15) calendar
days after the service of the citation or summons).  It is
understood, however, that the Indemnified Party shall be
authorized and expected to take any such prompt action as may be
reasonably necessary in the circumstances of any proceedings
seeking an injunction or similar equitable relief against it.
The Indemnifying Party may, at its own expense (i) participate in
the defense of any Claim for which it is obligated to indemnify
the Indemnified Party hereunder and (ii) upon notice to the
Indemnified Party at any time during the course of any such
Claim, assume the defense thereof; provided, however, that
(i) the Indemnifying Party's counsel is reasonably satisfactory
to the Indemnified Party and (ii) the Indemnifying Party shall,
upon reasonable request, thereafter consult with the Indemnified
Party from time to time with respect to such Claim.  If the
Indemnifying Party assumes such defense, the Indemnified Party
shall have the right (but not the duty) to participate in the
defense thereof and to employ counsel, at its own expense,
separate from the counsel employed by the Indemnifying Party.
Whether or not the Indemnifying Party chooses to defend or
prosecute any such Claim, both parties hereto shall cooperate in
the defense or prosecution thereof.

               Settlement or Compromise.  Any settlement or
compromise made or caused to be made by the Indemnified Party or
the Indemnifying Party (as the case may be) of any Claim shall be
binding upon the Indemnifying Party or the Indemnified Party (as
the case may be) in the same manner as if a final judgment or
decree has been entered by a court of competent jurisdiction in
the amount of such settlement or compromise; provided however,
that no obligation, restriction or loss shall be imposed on an
Indemnified Party as a result of such settlement without its
prior written consent which consent shall not be unreasonably be
withheld, and such settlement shall include an unconditional
release of the Indemnified Party; and provided further, that the
Indemnified Party shall not make or cause to be made any such
settlement or compromise without the prior written consent of the
Indemnifying Party, which consent shall not unreasonably be
withheld.  The Indemnified Party will give the Indemnifying Party
at least thirty (30) days' prior written notice of any proposed
settlement or compromise of any Claim it itself is defending,
during which time the Indemnifying Party may assume the defense
of, and responsibility for, such Claim and, if it does so, the
proposed settlement or compromise may not be made.

               Failure of Indemnifying Party to Act.  In the
event that the Indemnifying Party does not elect to assume the
defense of any claim or to cause the same to be done, then any
failure of the Indemnified Party to defend or participate in the
defense of any such claim or to cause the same to be done, shall
not relieve the Indemnifying Party of its obligations hereunder;
provided however, that the Indemnified Party shall have given the
Indemnifying Party at least thirty (30) days' notice of its
proposed failure to defend or participate and afford the
Indemnifying Party the opportunity to assume defense thereof
prior to the end of such period.

               Procedure for Indemnification.  Upon becoming
aware of any claim for indemnification, the Indemnified Party
shall promptly give notice of such claim (a "Claim Notice") to
the Indemnifying Party and will provide, to the extent possible
and without prejudice to the rights of the Indemnified Party
hereunder, a good faith estimate of the amount the Indemnified
Party reasonably anticipates that it will be entitled to on
account of indemnification by the Indemnifying Party.  If the
Indemnifying Party does not object to such indemnification claim
within forty-five (45) days of receiving notice thereof, the
Indemnified Party shall be entitled to recover promptly the
amount of such claim (but such recovery shall not limit the
amount of any additional indemnification or other rights to which
the Indemnified Party may be entitled pursuant to this Article
IX).  If, however, the Indemnifying Party advises the Indemnified
Party that it disagrees with the Indemnified Party's claim, the
parties shall, for a period of forty five (45) days after the
Indemnifying Party advises the Indemnified Party of such
disagreement, attempt to resolve the difference.  If the parties
are unable to reach agreement within such forty five (45) days,
the disagreement shall be resolved pursuant to Section 10.8
hereof.

               Limitations.  No claim for indemnification shall
be valid unless first made in writing within forty-five (45) days
of the Indemnified Party's first notice of such claim.

ARTICLE
MISCELLANEOUS

          Confidentiality.

               Confidentiality Defined.  For the purposes of this
Agreement, the term "Confidential Information" shall be any
information embodying concepts, ideas, techniques, proprietary
information, know-how, formulations, market data, customer lists,
product specifications and accounting data which:

                    is disclosed by one party hereto to the
     other;
     
                    is claimed by the disclosing party to be
     secret, confidential and proprietary to the disclosing
     party; and
     
                    if disclosed in writing, is marked by
     the disclosing party to indicate its confidential
     nature or, if disclosed orally as confidential, is
     confirmed in writing by the disclosing party to be
     confidential within ten (10) days following disclosure.
     
               Non-Disclosure.  During the period that this
Agreement remains in effect and for a period of three (3) years
following termination hereof, each party (except as is explicitly
otherwise required hereby) shall keep confidential, shall not use
for itself or for the benefit of others and shall not copy or
allow to be copied in whole or in part any Confidential
Information disclosed to such party by the other.  The obligation
of confidentiality imposed upon the parties by the foregoing
paragraph shall not apply with respect to any alleged
Confidential Information which:

                    is known to the recipient thereof, as
     evidenced by said recipient's written records, prior to
     receipt thereof from the other party hereto;
     
                    is disclosed to said recipient after the
     date hereof by the third party who has the right to
     make such disclosures and who does not violate any
     confidentiality agreement with the affected party
     hereto;
     
                    is or becomes a part of the public
     domain through no fault of the said recipient; or
     
                    is required by law or judicial or
     administrative process to be disclosed.
     
               Non-Disclosure of Relationship.  PERIMMUNE and
MENTOR shall agree to keep confidential and not disclose to third
parties, the supply and working relationship under this
Agreement.

               Limited Use of Confidential Information.  Each
party agrees to limit access to Confidential Information to
employees and agents having a need to know and to protect
Confidential Information to the same extent as it protects its
own trade secrets.

          Notices.  Any notices or report or  other communication
permitted or required under this  Agreement shall be in writing
and sent by certified mail, express mail; Federal Express,
postage paid, return receipt requested, addressed to the party to
whom the notice is to be given.  All notices, reports or other
communications made hereunder shall be deemed to have been made
on the date postmarked.  Changes in address shall be accomplished
by a notice in compliance with this Section 10.2.  The current
address for each party is as follows:

     PERIMMUNE                    MENTOR Corporation
     1330 Piccard Drive           5425 Hollister Avenue
     Rockville, Maryland 20850-   Santa Barbara, California
     4396                         93111
     Attn:  Dr. Bryan Butman      Attn:  Mr. Anthony Gette
          
          Binding Effect.  This Agreement shall be binding upon
and shall inure to the benefit of each of the parties and their
respective heirs, successors, assigns and legal representatives.
Either party may freely assign this Agreement to any Affiliate,
and either party shall have the right to assign its rights and
licenses and to delegate its duties under this Agreement to any
third party who (a) purchases all or substantially all of the
business assets of the assignor or who succeeds to the business
of the assignor by reason of a merger or consolidation and (b)
agrees to assume the duties and obligations of the assignor
hereunder.  Except as expressly provided herein, no party hereto
shall have the right to transfer or assign its interest in this
Agreement without the prior written consent of  the other party
hereto, which consent may not be unreasonably withheld.  The
assignment by either party of any rights under this Agreement
shall not relieve the assigning party from any of its obligations
under this Agreement.

          Force Majeure.  Neither party shall be liable in
damages for, nor shall this Agreement be terminable or cancelable
by reason of any delay or default in such party's performance
hereunder if such default or delay is caused by events beyond
such party's reasonable control including, but not limited to,
acts of God, regulation or law or other action of any government
or agency thereof, war or insurrection, civil commotion,
destruction or production facilities or materials by earthquakes,
fire, flood or storm, labor disturbances, epidemic, or failure of
supplies, public utilities or common carriers.  Each party shall
endeavor to resume its performance hereunder if such performance
is delayed or interrupted by reason of force majeure.  Each party
shall notify the other, in writing, not less often than monthly,
of the nature of progress of such endeavors.

          Insurance.  Each party shall keep in force during the
term of this Agreement, and for a period of three (3) years
following its termination, product liability insurance in such
amounts as may be customary for like-sized businesses undertaking
like responsibilities to those contemplated by this Agreement.
Each party shall submit a certificate of insurance to the other
evidencing such coverage upon written request therefor.

          Severability.  Should any part of this Agreement be
held unenforceable or in conflict with the applicable laws or
regulations of any jurisdiction, the invalid or unenforceable
part or provision shall be replaced with a provision which
accomplishes, to the extent possible, the original business
purpose of such part or provision in a valid and enforceable
manner, and the remainder of this Agreement shall remain binding
upon the parties.

          Waiver.  Waiver by either party of a default or breach
or a succession of defaults or breaches, or any failure to
enforce any right hereunder shall not be deemed to constitute a
waiver of any subsequent default or breach with respect to the
same or any other provision hereof, and shall not deprive such
party of any right to terminate this Agreement arising by reason
of any subsequent default or breach.

          Mediation.  Unless the relief sought requires the
exercise of the equity powers of a court of competent
jurisdiction, neither party shall commence any action or
proceeding to construe or enforce the terms and conditions of
this Agreement unless such party has first given written notice
of its intention to do so and submitted such matter to non-
binding mediation if the other party desires to have the
controversy mediated.  Any party who receives from the other
party (a) a notice of default under this Agreement, or a notice
that such other party intends to submit a controversy or dispute
for adjudication, shall have a period of fifteen (15) days after
its receipt of such notice to request that the dispute or
controversy be submitted to mediation, and the failure of the
recipient of any such notice to make a written request for
mediation within such fifteen (15) day period shall be deemed to
have waived its right to require that such matter be submitted to
mediation.  The period during which any such matter is being
mediated shall not toll the period during which any party who is
in default in the performance of its obligations under this
Agreement is obligated to remedy or cure such default.

          Venue and Jurisdiction.  The parties hereto (a)
mutually consent and stipulate that any action or proceeding
commenced to interpret or enforce this Agreement or the rights
and duties of the parties hereunder shall be commenced and
conducted in a state or federal court of competent jurisdiction
situated in the county or judicial district in which the
defendant in such action or proceeding has its corporate
headquarters, (b) each waive any claim that any such state or
federal court is an inconvenient forum, and (c) each irrevocable
agree that any and all actions or proceedings arising out of or
relative to this Agreement or from transactions contemplated
herein shall be exclusively heard only in such state or federal
court.

          Governing Law.  This Agreement, the construction and
enforcement of its terms, and the interpretation of the rights
and duties of the parties hereunder shall be governed by and
interpreted in accordance with the laws of the State of Maryland
without regard to the choice of law rules utilized in that
jurisdiction.

          Costs of Enforcement.  Should any action or proceeding
be necessary to construe or enforce this Agreement, then the
party prevailing in any such action or proceeding shall be
entitled to recover all court costs and reasonable attorneys'
fees, to be fixed by the court and taxed as part of any judgment
entered therein, and the costs and fees incurred in enforcing or
collecting any such judgment.

          Entire Agreement.  This Agreement represents the entire
understanding between the parties as of the Effective Date with
respect to the subject matter hereof, and supersedes all prior
agreements, negotiations, understandings, representations,
statements, and writings, between the parties relating thereto.
No modification, alteration, waiver or change in any of the terms
of this Agreement shall be valid or binding upon the parties
hereto unless made in writing and specifically referring to this
Agreement and duly executed by each of the parties hereto.

          IN WITNESS WHEREOF, the parties hereto have caused this
Agreement to be executed in duplicate by their duly authorized
representatives as of the day and year first written above.


PERIMMUNE, INC.                  MENTOR CORPORATION
                                 
                                 
By:  /s/MICHAEL G. HANNA         By:  /s/CHRISTOPHER CONWAY
     Name:  Michael G. Hanna          Name:  Christopher Conway
     Title:  President                Title:  Chairman, CEO






MGH/wmh:6/5/97
PerImmune.wp6
MGH/wmh:6/5/97
PerImmune.wp6
         DISTRIBUTION AGREEMENT BETWEEN PERIMMUNE, INC.,
                        AND MENTOR CORP.

     This Exclusive Distribution Agreement (hereinafter the
"Agreement") is made in Rockville, Maryland, by and between
PerImmune, Inc. (hereinafter "PERIMMUNE"), a corporation existing
under the laws of Delaware, and MENTOR Corp. (hereinafter
"MENTOR"), a corporation existing under the laws of Minnesota.

     WHEREAS, PERIMMUNE desires to sell and/or market its AuraTek-
FDP Bladder Cancer Diagnostic product and MENTOR desires to
purchase PERIMMUNE's product for resale to customers bearing a
trademark or trade name and logo owned by MENTOR; and

     WHEREAS, the parties desire to enter into an agreement
setting forth the terms of their relationship,

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

1.   Product. The product of PERIMMUNE covered by this Agreement
     is set forth on Exhibit A attached hereto (hereinafter the
     "Product") and any future modifications or improvements
     thereto. PERIMMUNE reserves the right to modify the Product
     from time to time, and shall give MENTOR at least six (6)
     months prior written notice before making changes to its
     manufacturing process that would have an impact on any of
     PERIMMUNE's product verifications or validations, or changes
     in raw materials that would alter the operating principle of
     the Product or other changes that could impact product
     labeling or promotional literature; provided, however, that
     PERIMMUNE shall be required to provide MENTOR with only
     reasonable advance notice where such modification is
     required to comply with any applicable legal or regulatory
     requirement or the unanticipated modification or
     unavailability of raw material.

2.   Appointment and Acceptance. PERIMMUNE hereby grants MENTOR
     the exclusive right to distribute the Products in the United
     States, and outside the United States (the "Territory").

3.   Term and Renewal. The term of this Agreement shall be for a
     period of five (5) years, commencing on the Effective Date
     (the "Initial Term"). "Effective Date" means the date on
     which this Agreement is executed. This Agreement shall
     automatically renew for additional and successive terms of
     one (1) year unless either party provides written notice on
     non-renewal at least six (6) months prior to the close of
     the initial Term or any anniversary date thereafter.

4.   Terms of Sale.

     (a)  MENTOR shall fix the price of the individual Product
          sold hereunder. On a monthly basis, MENTOR shall pay to
          Perimmune, in United States Dollars, fifty percent
          (50%) of the Net Sales, as defined below, received by
          MENTOR from the sale of the Product, less the Advances,
          as hereinafter defined, paid by MENTOR to PerImmune
          during such month. For purposes herein, "Advances" shaD
          mean an amount equal to 25% of the list price, per kit,
          paid by MENTOR to PerImmune within 30 days of MENTOR's
          receipt of kits ordered by it. Unless MENTOR and
          PerImmune otherwise agree in a writing signed by both
          of them, the payment and other provisions set forth in
          this Agreement shall supersede those of any subsequent
          purchase order, sales confirmation form or other
          document hereinafter sent by either party hereto to the
          other. For purposes hereof, Net Sales shall mean the
          gross invoiced price for the sales of the Products to
          Purchasers by MENTOR, its agents or affiliates ("Gross
          Sales") less (a) any credits and allowances granted by
          MENTOR to purchasers with respect to the Product,
          including, without limitation, credits and allowances
          on account of price adjustments, returns, discounts,
          and chargebacks, (b) any sales, excise, value added,
          turnover or similar taxes, and (c) transportation,
          insurance and handling expenses if separately invoiced
          and directly chargeable to such sales.
     
     (b)  Within thirty (30) days after the end of each month
          MENTOR shall submit a report to PERIMMUNE setting forth
          the (i) cumulative number of kits purchased from
          PERIMMUNE through the end of the preceding month (ii)
          50% of net sales price for each such kit sold through
          the end of the preceding month, (iii) the advances
          previously paid for such kits.  Each such report shall
          be accompanied by payment of the difference between
          (ii) and (iii).
     
     (c)  Title and risk of loss shall pass to MENTOR upon
          release of Product for shipment by PERIMMUNE to the
          designated carrier.  All freight and applicable
          insurance charges shall be the responsibility of MENTOR
          PERIMMUNE will be responsible for contracting freight
          services, in accordance with Section 8(a) of this
          Agreement, for which MENTOR will be billed on a
          shipment by shipment basis. Product is subject to
          inspection and acceptance by MENTOR upon receipt.
          MENTOR shall be deemed to have accepted all shipments
          of Product unless rejected for non-conformity with the
          Quality Specifications, as hereinafter defined, in
          accordance with Article 9 of this Agreement, within
          twenty (20) working days after receipt of shipments
          from PERIMMUNE.
     
     (d)  Unless approved by MENTOR in writing, PERIMMUNE will
          not sell any Product to MENTOR as of the effective date
          hereof that has less than eighteen (18) months shelf-
          life from date of shipment by PERIMMUNE.
     
5.   Termination.  Should any of the following events occur, the
     affected party may terminate this Agreement by giving
     notice, in writing to be effective on the date specified in
     the notice, namely,

          (a)  failure of either party to observe any of the
          terms hereof to a material extent and to remedy the
          same (where it is capable to being remedied) after
          having received reasonable notice from the aggrieved
          party and a reasonable opportunity to cure;

     (b)  either party becoming insolvent or having a receiver
          appointed of its assets, or execution or distress
          levied upon its assets;
     
     (c)  an order being made or a resolution being passed for
          the winding up or liquidation of either party;
     
     (d)  if PERIMMUNE discontinues manufacturing the product for
          va]id business reasons that cannot be remedied during
          the term of this Agreement then (i) at the request of
          MENTOR, PERIMMUNE shall assist MENTOR in establishing
          an alternative source of supply and shall transfer any
          necessary technology or knowledge to MENTOR or its
          alterative supplier provided that MENTOR reimburses
          PERIMMUNE the out-of-pocket costs of doing so
          (including salary and benefits for time expended by
          PERIMMUNE employees, (ii) or if the discontinuation
          occurs during the first three years MENTOR can receive
          the return of its investment at its election. Nothing
          herein is intended to permit PERIMMUNE to breach its
          obligation under the agreement.
     
6. Procedures on Termination. Upon termination or non-renewal of
this Agreement:

     (a)  MENTOR shall return to PERIMMUNE all literature which
          PERIMMUNE shall have supplied to MENTOR and which is in
          its possession.
     
     (b)  the rights and duties of each party under this
          Agreement in respect of performance prior to
          termination or non-renewal shall survive and be
          enforceable in accordance with the terms of this
          Agreement.
     
     (c)  within thirty (30) days of receipt of PERIMMUNE's
          invoice therefor, MENTOR will pay PERIMMUNE for all
          remaining inventory of Product for which MENTOR has
          issued purchase orders to PERIMMUNE. Upon payment,
          PERIMMUNE will ship such inventory to MENTOR at
          MENTOR's expense.
     
7.   MENTOR's Duties. MENTOR shall:

     (a) use best commercial efforts to advertise and promote the
     sale of the Product in a manner calculated by MENTOR to
     yield benefit to the parties hereto in light of the
     prevailing circumstances and to the extent to which any
     products are at the relevant time competitive with other
     products. MENTOR agrees that during the term of this
     Agreement, it will not market any product using the same
     technology which detects the same analyte and thereby
     directly competes with a Product.
     
     (b)  submit its purchase orders to PERIMMUNE in writing or
          via facsimile, signed by an authorized representative
          of MENTOR.
     
     (c)  pay an PERIMMUNE invoices in United States currency by
          company check.
     
     (d)  submit to PERIMMUNE a twelve (12) month forecast of
          purchases delivery dates from PERIMMUNE for the Product
          in a format to be mutually determined by the parties.
          Said forecast shaD be submitted by MENTOR to PERIMMUNE
          within thirty (30) days of commencement of the term of
          this Agreement, and quarterly thereafter.
     
     (e)  obtain advance written authorization and a Returned
          Material Authorization ("RMA") prior to resuming any of
          the Product.
     
     (f)  maintain a properly framed sales force of adequate size
          to represent and promote the sale of the Product and
          provide instructions to customers in the use of the
          Product. MENTOR shall be responsible for developing its
          own marketing plan and system for dispensing the
          Product.
     
     (g)  carry in stock an inventory of Product sufficient to
          promptly fill the orders of MENTOR's customers in the
          Territory.
     
     (h)  apply for and obtain an necessary licenses, permits and
          other authorizations required by local law or
          regulation in relation to the promotion, marketing,
          distribution and supply of the Product in any
          jurisdiction or country in which MENTOR sells the
          Product.
     
     (i)  pay any import duty or like charge on the entry of the
          Product into the Territory and any local or other
          applicable taxes.
     
     (j)  maintain separate and detailed accurate and complete
          records of all transactions in respect of the Product,
          including, but not limited to, such records as identify
          all customer purchases by Product and serial and/or lot
          number, and possess the capability to notify all
          purchasers in the event of a Product recall or
          corrective action.
     
     (k)  defray all expenses of and incidental to the
          distribution and sale of Product hereunder incurred by
          MENTOR
     
     (l)  make no contracts or commitments on behalf of PERIMMUNE
          or make any promises or representations or give any
          warranties or guarantees with respect to the Product
          except as herein expressly permitted or otherwise incur
          any liability on behalf of PERIMMUNE without
          PERIMMUNE's prior written consent, nor represent itself
          as agent or partner of PERIMMUNE.
     
     (m)  comply with all laws and regulations and requirements
          applicable to a seller of invitro diagnostics products,
          and with all laws and regulations and requirements of
          governmental agencies having jurisdiction with the
          Territory.
     
     (n)  except as authorized in writing by PERIMMUNE, refrain
          absolutely from using the trademark or trade name and
          logo of PERIMMUNE in connection with the marketing,
          distribution and sale of any Product.
     
8.   PERIMMUNE's Duties. PERIMMUNE shall:

     (a)  make reasonable best efforts, in good faith, to ship
          MENTOR's orders for Product within thirty (30) days
          from date of order receipt. MENTOR shall specify the
          method of shipment and insurance and PERIMMUNE shall
          make reasonable best efforts, in good faith, to comply
          with such specifications. If no such specification is
          made, or if the specification cannot be reasonably
          complied with after notice to MENTOR and an opportunity
          to resolve the issues surrounding PERIMMUNE's alleged
          inability to comply, PERIMMUNE may select a reasonable
          manner of shipment and insurance.
     
     (b)  at the time of shipment, the product will have a
          remaining shelflife of not less than 16 months.
     
     (c)  will provide up to 12,000 units per year of product at
          PERIMMUNE's cost plus shipping charges to be used by
          MENTOR for promotional purposes at no reimbursement to
          MENTOR.
     (d)  comply with all laws and regulations and requirements
          applicable to PERIMMUNE as a manufacturer of in-vitro
          diagnostic products.
     
     (e)  except as authorized in writing by MENTOR, refrain
          absolutely from using the trademark or trade name and
          logo of MENTOR in connection with the marketing,
          distribution and sale of any Product.
     
     (f)  provide reasonable technical assistance to MENTOR's
          personnel necessary for the marketing of the Product.
     
     (g)  at PERIMMUNE's expense, provide MENTOR with written
          product inserts relating to the Product's use, and with
          such amendments thereto as subsequently become
          available.
     
     (h)  provide necessary documentation to assist MENTOR in
          meeting requirements to register Products in the
          Territory, and where possible, allow MENTOR to utilize
          prior registrations by PERIMMUNE.
     
     (i)  provide MENTOR with copies of the 510(k) premarket
          notifications submitted for the Product, copies of
          current package insert for the Product, copies of
          documents describing specifications for the Product,
          and copies of all current and future correspondence
          with the FDA pertaining to the Product. PERIMMUNE will
          comply with the FDA's current GMP regulations in the
          manufacture of the Product, if those regulations are
          modified to include components of finished devices. If
          needed to comply with any change in the law or FDA's
          GMP regulations or policies, MENTOR shall be given the
          right to inspect PERIMMUNE's manufacturing facilities
          and GMP records pertaining to the manufacture of the
          Product. If any action should be taken by the FDA to
          restrict or prevent the distribution of any of the
          Product for more than thirty (30) days, and such
          restriction is not due to the negligence of MENTOR,
          then upon notice to PERIMMUNE, MENTOR shall have the
          right to terminate this Agreement as to such Product.
          PERIMMUNE shall replace any affected inventory of
          Product under this section or refund to MENTOR the
          purchase price it paid to PERIMMUNE for such inventory
          if PERIMMUNE is unable to replace the Product with
          comparable inventory. PERIMMUNE shall replace or
          repurchase any affected inventory of Product which
          MENTOR replaces or repurchases from MENTOR's customers,
          at the price MENTOR paid PERIMMUNE for such inventory.
          IN NO CASE SHALL PERIMMUNE BE LIABLE FOR CONSEQUENTIAL
          OR INCIDENTAL DAMAGES.
     
     (i)  comply with the Federal Food, Drug, and cosmetic Act.
          The Product comprising each shipment or other delivery
          hereafter made by PERIMMUNE to, or on the order of,
          MENTOR, as of the date of such shipment or delivery,
          shall be, on such date, not adulterated or misbranded
          within the meaning of the Federal Food, Drug, and
          Cosmetic Act.
     
9.   Performance Standards.

     (a)  Quality Specifications and Characteristics. PERIMMUNE
          shall deliver to MENTOR Product having the quality
          specifications agreed upon by the parties as set forth
          in Exhibit B (the "Quality Specifications").
     
     (b)  Certificate of Analysis. Concurrent with shipment,
          PERIMMUNE shall fax to MENTOR a Certificate of
          Analysis, in the form set forth in Exhibit B, for each
          lot of Product sold to MENTOR, confirming that the
          Product meets the Quality Specifications.
     
          (c)  Product Acceptance. Within twenty (20) working
          days of receipt of Product, MENTOR shall take and
          conduct analysis of samples of Product delivered by
          PERIMMUNE. Should the result of an analysis of such
          sample deviate from the Quality Specifications, MENTOR
          shall notify PERIMMUNE in accordance with Article 4(c)
          hereof and immediately thereafter provide PERIMMUNE
          with samples of the Product tested. If following a
          review of the test results and after conducting its own
          tests of the sample, PERIMMUNE agrees that such sample
          does not conform to the Quality Specifications,
          PERIMMUNE shall provide MENTOR, free of any additional
          charge, with new deliveries of the same quantity of the
          Product as the one from which the sample was taken, or,
          in PERIMMUNE's discretion and at its cost, PERIMMUNE
          may promptly reprocess the nonconforming Product to
          meet the Quality Specifications. In either event,
          MENTOR shall return, at PERIMMUNE's expense, the
          particular lot or shipment of the Product which does
          not comply with the Quality Specifications if requested
          to do so by PERIMMUNE.

10.  Product Recall.

     (a)  PERIMMUNE shall maintain an appropriate record of all
          claims made or to be made regarding the Products
          performance.
     
     (b)  Each party shall keep the other informed of any formal
          action relating to any specific lot of Product sold to
          MENTOR hereunder by an regulatory agency of any state,
          national government, or government agency having
          jurisdiction.
     
     (c)  Should any governmental or corporate action require the
          recall or field corrections or withholding from market
          of Product sold by PERIMMUNE to MENTOR, MENTOR shall
          bear the reasonable, direct costs and expenses of
          recall or field correction if such recall or field
          correction is the result of any fault or omission
          attributable to MENTOR and PER~E shall bear the cost of
          products and the actual costs of replacing the Product
          if such recall or field correction is the result of any
          fault or omission attributable to PERIMMUNE. Should
          such recall or field correction result from the fault
          of both parties, the parties shall share the costs of
          Products and the actual cost of replacing the Products
          in proportion to their respective degree of fault.
     
11. Product Complaints.

     (a)  Should either party experience any quality problem
          involving field correction or recall of any specific
          lot(s) of Product supplied to MENTOR by PERIMMUNE, such
          party will notify the other in writing by facsimile
          within twenty-four (24) hours of the initiation of the
          field correction or recall. Both parties will test
          retained samples of lots in question and report its
          findings to the other within ten (10) working days.
          Each party retains the right to correct field problems
          arising out of its fault or omission as it deems
          appropriate, with or without the concurrence of the
          other. All information about Product complaints shall
          be considered "Confidential Information" under the
          terms of the Agreement.
     
     (b)  Either party shall immediately notify the other party
          in writing should it become aware of any defect or
          condition that renders any lot(s) of Product supplied
          by PERIMMUNE to MENTOR in violation of the United
          States Food, Drug and Cosmetic Act, or of a similar law
          of any jurisdiction or country where the Product is
          sold. The parties shall share with each other all data
          on confirmed lot specific Product complaints including,
          but not limited to, complaints or information regarding
          performance and/or allegations or reports of any
          negative effect from the use or misuse of such affected
          lot of Product as soon as such data is available. Each
          party will provide reasonable assistance to the other
          in resolving customer complaints to the extent the
          complaint arises out of any fault or omission of the
          party whose assistance is requested. However, MENTOR
          shall have sole responsibility and authority to
          interact directly with MENTOR's customers in the
          resolution of such complaints and PERIMMUNE agrees that
          it will only interact with MENTOR in such matters.
     
     (c)  PERIMMUNE shall evaluate and investigate all customer
          complaints in connection with the Product which may be
          brought to its attention, in writing, by MENTOR;
          provided such complaints have been confirmed by MENTOR
          QA/QC or technical service personnel using the same
          standards for confirmation which MENTOR's uses for
          products other than the PER~ Product and which are
          believe in good faith by MENTOR to arise out of a fault
          or omission attributable to PERIMMUNE. Within twenty
          (20) calendar days following receipt from MENTOR of the
          original notification of each such complaint, PER~E
          agrees to provide MENTOR with a written interim or
          final complaint investigation report, using the same
          standards for evaluation and investigation that P~ uses
          for products other than the Product. All such Product
          complaints reported to PERIMMUNE by MENTOR shall be
          reviewed monthly by PERIMMUNE until closure, and a
          summary report thereof will be provided by PERIMMUNE to
          MENTOR.
     
     (d)  PERIMMUNE will report to MENTOR all data and/or
          information pertaining to adverse reports on any lot of
          Product supplied by PER~ for distribution by MENTOR
          which would have a materially adverse impact on
          performance of the Product.
     
          (e)  Recalls or field notifications with respect to the
          Product, or any of them, shall be the responsibility of
          the party whose fault or omission necessitated such
          action, as described in Article 10(c).

     (f)  Should there be a difference of opinion between
          PERIMMUNE and MENTOR regarding a field notification or
          recall, MENTOR will exercise the right to notify its
          customers without delay.
     
12. Warranties.

     (a)  PERIMMUNE warrants that the Product which is or will be
          the subject of FDA cleared 510(k) premarket
          notifications have not been changed or modified in
          design, components, method of manufacture or intended
          use from the Product as described in those 510(k)
          premarket notifications, and will notify MENTOR in
          advance of any changes in accordance with Article 1.
     
     (b)  PerImmune warrants that the Product manufactured and
          supplied under this Agreement shall at the time of
          shipment meet the Quality Control Specifications of
          PERIMMUNE which are attached to this Agreement as
          Exhibit B. No claim under this warranty may be made
          with respect to a unit of the Product if shipped or
          used after the expiration of the shelf-life of the
          Product as determined by PERIMMUNE. PERIMMUNE further
          warrants that prior to shipment to MENTOR, all of its
          standard tests and quality control procedures have been
          carried out in relation to each lot of the Product with
          satisfactory results. The limited warranty to MENTOR
          set forth in this Agreement shall control over any
          warranty provisions which may be set forth in MENTOR's
          Product literature and MENTOR shall hold PERIMMUNE
          harmless from any and all damages and expenses which
          PERIMMUNE may incur as a result of unauthorized MENTOR
          warranties or representations. PERIMMUNE MAKES NO
          WARRANTIES EXPRESSED OR IMPLIED WITH RESPECT TO THE
          PRODUCTS BEYOND THAT WHICH IS SET FORTH IN THIS
          AGREEMENT INCLUDING THE WARRANTIES OF MERCHANTABILITY
          AND FITNESS FOR ANY PARTICULAR PURPOSE. Any warranty
          made by MENTOR to its customers with respect to the
          Product shall not obligate PERIMMUNE in any way.
     
     (c)  Upon its verification of any claim of defect or
          nonconformity of any unit of the Product arising out of
          a fault or omission attributable to PERIMMUNE, during
          the term of this Agreement, PERIMMUNE will provide
          MENTOR with a replacement unit to the extent necessary
          to honor PERIMMUNE's warranties contained in Section
          12(a) hereof, or make good any shortages or non-
          completed deliveries and shall pay all associated
          freight and insurance associated therewith.
     
     (d)  PERIMMUNE's liability under any legal or equitable
          theory to any person with respect to the Product and/or
          the relationship described in this Agreement shall be
          limited to the replacement of the unit, or if
          impractical, return of the purchase price paid by
          MENTOR for such unit. PERIMMUNE shall in no event be
          liable to MENTOR or any other person for any incidental
          or consequential damages, lost profits, cost of
          procurement of substitute goods or any indirect,
          special, or consequential damages even if PER~E has
          been informed of the possibility thereof.
     
     (e)  As of the date hereof, PERIMMUNE warrants that it has
          no knowledge that the manufacture, use or sale of all
          or any of the Product under this Agreement, nor any
          method of using such Product infringes on any patent or
          other industrial property right of a third party, and
          PERIMMUNE has not received any notification from any
          third party alleging that the manufacture, use or sale
          of any such Product does or would infringe any patent
          or other industrial property. PERIMMUNE shall further
          disclose all information relating to the art of the
          Product of which it is, or becomes, aware relating to
          intellectual property, when PERIMMUNE recognizes
          necessary to do so.
     
13.  Packaging and Intellectual Property. MENTOR shall be
     responsible for packaging and labeling the Product. MENTOR
     will distribute the Product only with all appropriate
     labeling, packaging, and Product literature and only under
     MENTOR's applicable trademarks and trade names. MENTOR
     recognizes PERIMMUNE's right, title and interest in its
     patents, trademarks, trade names and copyrights, trade
     secrets and proprietary information in connection with the
     Product, and MENTOR shall not claim any ownership right
     thereto inconsistent with this Agreement, or dispute the
     validity thereof. In the event any third party shall contest
     PERIMMUNE's rights to its patents, trademarks, trade names
     or copyrights, trade secrets or propriety rights, MENTOR
     shaD, at PERIMMUNE's sole expense, render reasonable
     assistance to PER~ in defending such claims.

14.  Compliance with other Agreements. Each party represents and
     warrants that the execution and delivery by it of this
     Agreement and the performance by it of its obligations
     hereunder will not, with or without the giving of notice or
     the passage of time, violate any judgement, writ, injunction
     or order of any court, arbitration or governmental agency or
     conflict with, result in the breach of any provisions of, or
     the termination of, or constitute a default under, any
     agreement to which PERIMMUNE or MENTOR is a party or by
     which it is or may be bound.

15.  Indemnity.

     (a)  Except as limited by the remainder of this paragraph,
          PERIMMUNE hereby agrees to indemnify MENTOR against
          claims of third parties for injuries to their persons
          arising from the use of Product supplied by PERIMMUNE
          to MENTOR hereunder. This indemnity shall not apply to,
          and PERIMMUNE shall not be liable for, claims for
          injuries caused by or arising from:
     
          1)   any act or failure to act on the part of MENTOR
               its employees, representatives, agents, or
               subsidiaries in packaging, handling, storing or
               otherwise distributing such Product; or
          
          2)   any representation or warranty concerning the
               Product made by or on behalf of MENTOR and not
               specifically authorized by PERIMMUNE; or
          
          3)   claims where the use of the Product by any
               customer was not in accordance with the use
               prescribed by PERIMMUNE; or
          
          4)   MENTOR's failure to disseminate to purchasers or
               end-users any Product Information which PERIMMUNE
               has made available to MENTOR; or
          
          5)   claims where PERIMMUNE has not been notified in
               writing within forty five (45) days of MENTOR's
               first notice of the claim; or
          
          6)   claims where MENTOR fails to furnish evidence in
               its possession or fails to fully cooperate with
               PERIMMUNE in preparing the defense; or
          
          7)   claims where PERIMMUNE is not given the option to
               assume the sole defense of the claim at
               PERIMMUNE's expense; or
          
     (b)  PERIMMUNE shall indemnify MENTOR from any claims of
          patent infringement relating to a Product subject to
          this Agreement provided MENTOR gives PERIMMUNE notice
          within forty-five (45) days of MENTOR's first notice of
          the claim, and permits PERIMMUNE to assume the sole
          defense of the claim at PERIMMUNE's expense; provided,
          however, that the claim is not based on (i) the sale or
          use of any Product in combination with any other
          product which is not specifically authorized by
          PERIMMUNE in writing; (ii) the application of any
          Product in any manner not specifically authorized by
          PERIMMUNE in writing.
     
     (c)  MENTOR shall indemnify and hold PERIMMUNE harmless from
          and against any third party action brought against
          PERIMMUNE and any loss therefrom arising or related to
          this Agreement, except as may be caused by the
          negligent or willful act of PERIMMUNE.
     
     (d)  Not withstanding anything above to the contrary, in the
          event of a third party claim arising out of this
          Agreement, in which neither PERIMMUNE or MENTOR is in
          breach of this Agreement or is negligent, each party
          shall pay its respective legal expenses and damages
          caused by such claims
     
16.       Fees.     MENTOR acknowledges that it will pay $500,000
          (USD) to PERIMMUNE in connection with this Agreement,
          unless MENTOR elects to take an equity position in
          PERIMMUNE.

17.  Force Majeure. Neither party shall be responsible for any
     failure to perform due to causes beyond its control. These
     causes shall include, but not be limited to, fire, storm,
     flood, earthquake, explosion, wars, riots, civil disorder,
     sabotage, quarantine restrictions, labor disputes, labor
     shortages, transportation embargoes, or failure or delays or
     disruption in manufacturing process, curtailment of or
     failure in obtaining fuel or electrical power, or the acts
     of any governmental authority, or instrumentalities, orders
     of any court or tribunal whether foreign or domestic,
     exchange restrictions, acts of God, acts of the Federal
     Government or any agency thereof, acts of any state or local
     government or agency thereof, or shortage of materials or
     any similar or dissimilar occurrence beyond the reasonable
     control of the party which is prevented, interrupted or
     delayed in the performance of its obligations hereunder. In
     no event shall PER~E be under any obligations to purchase
     Products or similar products from any third party in order
     to supply same to MENTOR hereunder. Any force majeure event
     shall not excuse performance by the party but shall delay
     performance, unless such force majeure continues for a
     period in excess of ninety (90) days. In such event, the
     party seeking performance, as its sole and exclusive remedy,
     may cancel its obligations under this Agreement.

18.  Insurance. Each party shall keep in force during the term of
     this Agreement product liability insurance in such amounts
     as may be customary for like sized businesses undertaking
     like responsibilities to those contemplated by this
     Agreement. Each party shall submit a certificate of
     insurance to the other evidencing such coverage upon written
     request therefor.

19.  Confidentiality.

     (a)  Confidentiality Defined. For the purposes of this
          Agreement, the term "Confidential Information" shall be
          any information embodying concepts, ideas, techniques,
          proprietary information, know-how, formulations, market
          data, customer lists, product specifications and
          accounting data which:
     
          1)   is disclosed by one party hereto to the other;
          
          2)   is claimed by the disclosing party to be secret,
               confidential and proprietary to the disclosing
               party; and
          
          3)   if disclosed in writing, is marked by the
               disclosing party to indicate its confidential
               nature or if disclosed orally as confidential, is
               confirmed in writing by the disclosing party to be
               confidential within ten ( 10) days following
               disclosure.
          
     (b)  Non-Disclosure. During the period that this Agreement
          remains in effect and for a period of three (3) years
          following termination thereof, each party (except as is
          explicitly otherwise required hereby) shall keep
          confidential, shall not use for itself or for the
          benefit of others and shall not copy or allow to be
          copied in whole or in part any Confidential ~formation
          disclosed to such party by the other. The obligation of
          confidentiality imposed upon the parties by the
          foregoing paragraph shall not apply with respect to any
          alleged Confidential information which:
     
               (1)  is known to the recipient thereof, as
                    evidenced by said recipient's written
                    records, prior to receipt thereof from the
                    other party hereto;
               
               (2)  is disclosed to said recipient after the date
                    hereof by the third party who has the right
                    to make such disclosures and who does not
                    violate any confidentiality agreement with
                    the affected party hereto;
               
               (3)  is or becomes a part of the public domain
                    through no fault of the said recipient; or
               
               (4)  is required by law or judicial or
                    administrative process to be disclosed.
               
     (c)  PERIMMUNE and MENTOR shall agree to keep confidential
          and not disclose to third parties, the supply and
          working relationship under this Agreement.
     
     (d)  Each party agrees to limit access to Confidential
          ~formation to employees and agents having a need to
          know and to protect Confidential ~formation to the same
          extent as it protects its own trade secrets.
     
20.  Appointment of Sub-Distributors. MENTOR may assign,
     sublicense, delegate, or otherwise transfer the performance
     of the rights and obligations hereunder to qualified and
     reputable sub-distributors, provided, however, that: (i)
     MENTOR shall be liable to PERIMMUNE for the errors,
     negligent acts and omissions of its sub-distributor's as if
     such errors, negligent acts and omissions were its own,
     including any breach of any provision of this Agreement by
     the sub-distributors; (ii) MENTOR shall have and retain full
     control of any sub-distributors utilized, and shall be
     responsible for the performance by any sub-distributor; and
     (iii) MENTOR shall not be relieved of the responsibility for
     the proper performance and completion of the sub-distributed
     portions of its obligations hereunder.

21.  Successors. This agreement shall be binding upon the
     successors of PERIMMUNE and MENTOR, including successors who
     acquire the business assets of PERIMMUNE and MENTOR In the
     event the Principal(s) of PERIMMUNE shall sell all or a
     majority of the outstanding stock of PERIMMUNE, or in the
     event PERIMMUNE sells the business relating to the
     manufacture and sale for the Product, then the term of this
     Agreement may be extended unilaterally by MENTOR for three
     (3) successive terms of one (1) year each from the date of
     the transfer of the control of PERIMMUNE, or sale of the
     Product business, or the date for termination under the
     Agreement, whichever is the later, upon the terms of this
     Agreement. MENTOR shall give PERIMMUNE written notice of its
     intent to extend the term of this Agreement within thirty
     (30) days after PERIMMUNE advises MENTOR of the sale of
     PERIMMUNE's Product business and at least ninety (90) days
     before the end of each one (1) year term.

22.  Resolution of Disputes. In the event of any controversy or
     claim arising under or in  relation to this Agreement,
     including any issue about payment of amounts due, the
     parties  shall, in good faith, attempt to resolve the
     controversy or claim by negotiation. If the  controversy or
     claim cannot be resolved within sixty (60) days, then either
     party shall be  entitled to initiate litigation to resolve
     the dispute unless the parties have mutually agreed to
     arbitrate the dispute.

 23.      Notices. Any notice or other communication required or
     that shall be given pursuant to  this Agreement shall be
     deemed sufficient if delivered personally, sent by
     facsimile, telegraph, or sent by certified, registered or
     express mail, postage prepaid to the address or facsimile
     number set forth below:

     To PERIMMUNE:

          PERIMMUNE, INC.
          1330 Piccard Drive
          Rockville, MD 20850-4396
          Facsimile No: 301/840-2161
          ATTN: President and CEO

          MENTOR CORPORATION
          5425 Hollister Avenue
          Santa Barbara, CA 93111
          Facsimile No: 805/967-3362
          ATTN: Chairman of the Board, CEO

Either party may change the address to which notice to it is to
be given, as provided herein.

24.  Entire Agreement. This Agreement and the exhibits referred
     to herein constitute the entire  Agreement between the
     parties and supersede all prior proposals, communications,
     representations and agreements, whether written or oral,
     with respect to the subject matter  hereof. No change to the
     written terms of this Agreement shall be made except by
     written  instrumentation executed by the parties hereto.

25.  No Waiver. The failure of either party to enforce at any
     time any of the provisions of this  Agreement shall not be
     construed to be a waiver of those provisions or of the right
     of that party thereafter to enforce those provisions.

26.  Severability. If any provision of this Agreement is or
     becomes or is deemed invalid, illegal  or unenforceable in
     any jurisdiction in which the Agreement is sought to be
     enforced, (a) such provision shall be deemed and amended to
     conform to applicable laws of such jurisdiction so as to be
     valid and enforceable or, if it cannot be so amended without
     materially altering the intention of the parties, it shall
     be stricken; (b) the validity, legality and enforceability
     of such provision will not in any way be affected or
     impaired thereby in any other jurisdiction; and (c) the
     remainder of this Agreement shall remain in full force and
     effect.

27.  Headings. The headings of this Agreement are included only
     for ease of reference and shall not affect the
     interpretation of this Agreement in any manner.

28.  THIS AGREEMENT CONTAINS A BINDING ARBITRATION PROVISION
     ENFORCEABLE BY EITHER PARTY.

IN WITNESS WHEREOF, the parties have caused this Agreement to be
executed by their duty authorized officers or authorized
representatives.

PERIMMUNE, INC.
By:  /s/MICHAEL G. HANNA
Title:  President
Date:  June 13, 1997

MENTOR CORPORATION
By:  /s/CHRISTOPHER CONWAY
Title:  Chairman, CEO
Date:  June 13, 1997



                               10
|DC_DOCS\61191.3||
                    STOCK PURCHASE AGREEMENT
                                
          This Stock Purchase Agreement ("Agreement") is made and
entered into this 16th day of June, 1997, between PERIMMUNE
HOLDINGS, INC., a Delaware corporation ("Holdings"), and MENTOR
CORPORATION, a Minnesota Corporation ("Purchaser").

          WHEREAS, Holdings has authorized the issuance of up to
20 shares of its Series B Convertible Preferred Stock, par value
$0.01 per share having the rights, designations and preferences
set forth in the Certificate of Designation (as defined herein)
(the "Preferred Stock"), with an aggregate liquidation preference
of One Million Dollars ($1,000,000);

          WHEREAS, subject to, and in accordance with, the terms
hereof, Holdings desires to issue and sell to Purchaser, and
Purchaser desires to purchase and acquire from Holdings, 20
shares of the Preferred Stock (the "Preferred Shares"); and

          WHEREAS, Holdings holds all of the issued and
outstanding shares of capital stock of PERIMMUNE, INC., a
Delaware corporation.

          Accordingly, in consideration of the foregoing and of
the mutual promises, covenants, and conditions set forth below,
the parties hereby agree as follows:

     1.   DEFINITIONS.  As used herein, the terms below shall
have the following meanings:

          "Affiliate" shall mean any entity controlling,
controlled by or under common control with a Person.  For the
purposes of this definition, "control" shall have the meaning
presently specified for that word in Rule 405 promulgated by the
SEC under the Securities Act.

          "Agreement" shall mean this Stock Purchase Agreement,
together with all schedules and exhibits referenced herein.

          "Applicable Law" means any statute, law, rule, or
regulation or any judgment, order, writ, injunction or decree of
any Governmental Entity to which a specified person or property
is subject.

          "Certificate of Designations" means the Certificate of
Designations, Preferences and Relative, Participating, Optional
and Other Special Rights of Preferred Stock and Qualifications,
Limitations and Restrictions Thereof, of Series B Convertible
Preferred Stock of PerImmune Holdings, Inc., substantially in the
form attached hereto as Exhibit A.

          "Claim" has the meaning set forth in Section 8.6 of the
Agreement.

          "Claim Notice" has the meaning set forth in Section 8.6
of the Agreement.

          "Closing" has the meaning set forth in Section 5.1 of
the Agreement.

          "Closing Date" has the meaning set forth in Section 5.1
of the Agreement.

          "Code" means the Internal Revenue Code of 1986, as
amended.  All citations to the Code or to the regulations
promulgated thereunder shall include any amendments or any
substitute or successor provisions thereto.

          "Common Stock" has the meaning set forth in Section 3.3
of the Agreement.

          "Encumbrance" means any claim, lien, pledge, option,
charge, easement, security interest, right-of-way, encumbrance or
other rights of third parties, and, with respect to any
securities, any agreements, understandings or restrictions
affecting the voting rights or other incidents of record or
beneficial ownership pertaining to such securities.

          "Governmental Entity" means any court or tribunal in
any jurisdiction (domestic or foreign) or any public,
governmental, or regulatory body, agency, department, commission,
board, bureau, or other authority or instrumentality (domestic or
foreign).

          "Holdings Indemnified Parties" has the meaning set
forth in Section 8.3 of the Agreement.

          "Indemnified Parties" means Holdings Indemnified
Parties and Purchaser Indemnified Parties.

          "Losses" has the meaning set forth in Section 8.2 of
the Agreement.

          "Material Adverse Effect" with respect to any person or
entity shall mean an event, occurrence or condition that has had
or reasonably would be expected to have a material adverse effect
on the business, condition (financial or otherwise), assets,
liabilities, working capital or operations of such person or
entity and its Subsidiaries (if any), taken as a whole.

          "Material Agreement" means, with respect to Holdings or
PerImmune:

               (a)  any contract which involves performance of services or
                    delivery of goods and/or materials, by or to Holdings or
                    PerImmune of an amount or value in excess of $500,000;
                    
               (b)  any note, debenture, other evidence of indebtedness,
                    guarantee, loan, letter of credit, surety-bond or financing
                    agreement or instrument or other contract for money 
                    borrowed, including any agreement or commitment for future 
                    loans, credit or financing;
                    
               (c)  any lease, rental or occupancy agreement, license,
                    installment and conditional sale agreement, and other 
                    contract affecting the ownership of, leasing of, title to, 
                    use of, or any leasehold or other interest in, any real 
                    property;
                    
               (d)  any material licensing agreement or other contract with
                    respect to patents, trademarks, copyrights, or other 
                    intellectual property, including agreements with current or 
                    former employees, consultants or contractors regarding the 
                    exploitation, appropriation or the nondisclosure of 
                    Intellectual Property;
                    
               (e)  any employment agreement, collective bargaining agreement or
                    other contract to or with any employee or any labor union or
                    other employee representative of a group of employees 
                    relating to wages, hours, and other conditions of 
                    employment;
                    
               (f)  any bonus, pension, profit sharing, retirement, stock
                    purchase, stock option, deferred compensation, medical,
                    hospitalization or life insurance plan, contract, 
                    understanding with respect to any or all of the employees of
                    Holdings or PerImmune;
                    
               (g)  any joint venture contract, partnership agreement, limited
                    liability company or other contract (however named);
                    
               (h)  any agreement granting any preemptive right, right of first
                    refusal or similar right to any Person;
                    
(i)  any covenant not to compete or other restriction on the
ability of Holdings or PerImmune to conduct its business or
engage in any other activity;
(j)  any agreement not made in the ordinary course of business
that is material to Holdings or PerImmune; and
(k)  any amendment, supplement, and modification (whether written
or oral) in respect of any of the foregoing.
          "Permits" shall mean all licenses, permits, orders,
consents, approvals, registrations, authorizations,
qualifications and filings required by any federal, state, local
or foreign laws or governmental or regulatory bodies and all
industry or other non-governmental self-regulatory organizations.

          "Permitted Encumbrances" means (i) any mechanic's or
materialmen's lien or similar Encumbrances with respect to
amounts not yet due and payable or which are being contested in
good faith by appropriate proceedings and for which appropriate
reserves have been established, (ii) Encumbrances for Taxes not
yet due and payable or which are being contested in good faith by
appropriate proceeding, for which appropriate reserves have been
established, or (iii) easements, licenses, covenants, rights of
way and similar Encumbrances which, individually or in the
aggregate, would not materially and adversely affect the
marketability or value of  the property encumbered thereby or
materially interfere with the operations of Holdings or
PerImmune, as applicable.

          "Person" means any individual, copartner, association,
partnership, joint venture, limited liability company, trust,
estate or other entity or organization.

          "Preferred Shares" has the meaning set forth in the
Recital hereto.

          "Preferred Stock" has the meaning set forth in the
Recital hereto.

          "Proprietary Right" has the meaning set forth in
Section 3.15 of the Agreement.

          "Purchase Price" has the meaning set forth in Section 2
of the Agreement.

          "Purchaser Indemnified Party" has the meaning set forth
in Section 8.2 of the Agreement.

          "Registration Rights Agreement" means the Registration
Rights Agreement by and among Holdings and Purchaser
substantially in the form attached hereto as Exhibit B.

          "Return" or "Returns" means all returns, declarations,
reports, statements, and other documents required to be filed in
respect of Taxes.

          "Securities Act" means the Securities Act of 1933, as
amended.

          "Subsidiary" means, with respect to any Person, (a) any
corporation of which at least a majority in interest of the
outstanding voting stock (having by the terms thereof voting
power under ordinary circumstances to elect a majority of the
directors of such corporation, irrespective of whether or not at
the time stock of any other class or classes of such corporation
shall have or might have voting power by reason of the happening
of any contingency) is at the time, directly or indirectly, owned
or controlled by such Person, by one or more Subsidiaries of such
Person, or by such Person and one or more of its Subsidiaries, or
(b) any corporate or non-corporate entity in which such Person,
one or more Subsidiaries of such Person, or such Person and one
or more Subsidiaries of such Person, directly or indirectly, at
the date of determination thereof, has an ownership interest and
100% of the revenue of  which is included in the consolidated
financial reports of such Person consistent with generally
accepted accounting principles.

          "Tax" or "Taxes" means any federal, state, local,
foreign and other net income, gross income, gross receipts,
sales, use, ad valorem, transfer, franchise, profits, license,
lease, service, service use, withholding, payroll, employment,
excise, severance, stamp, occupation, premium, property, windfall
profits, customs, duties or other taxes, fees, assessments, or
charges of any kind whatever, together with any interest and any
penalties, additions to tax, or additional amounts with respect
thereto.

          "Third Party Notice" has the meaning set forth in
Section 8.6 of the Agreement.

     2.   ISSUANCE AND SALE OF THE PREFERRED SHARES.  At the
Closing, Holdings will issue and sell to Purchaser, and Purchaser
will purchase and acquire from Holdings, the Preferred Shares for
an aggregate purchase price of One Million Dollars ($1,000,000)
(the "Purchase Price").  The Preferred Shares will have the
respective rights, preferences and privileges set forth in
Holdings' Certificate of Incorporation as amended by the
Certificate of Designations.

     3.   REPRESENTATIONS AND WARRANTIES OF HOLDINGS.  Holdings
makes the following representations and warranties to Purchaser:

     3.1. Organization.  Holdings is a corporation duly
organized, validly existing, and in good standing under the laws
of the State of Delaware and has full power and authority to
conduct its business as currently conducted and to enter into and
perform this Agreement.

     3.2. Authorization.  The execution, delivery and performance
of this Agreement and the filing of the Certificate of
Designations by Holdings have been duly authorized by all
necessary corporate action on the part of Holdings.  This
Agreement has been duly executed by Holdings and delivered to
Purchaser and constitutes the legal, valid and binding obligation
of Holdings, enforceable in accordance with its terms except as
its enforceability may be limited by bankruptcy, insolvency, or
other laws affecting creditors' rights generally and the exercise
of judicial discretion in accordance with general equitable
principles and as provisions for indemnification, contribution or
waiver of statutory or other rights or remedies may be limited by
public policy considerations.

     3.3. Authorization of Issuance.  Upon issuance by Holdings
as contemplated herein and payment by Purchaser of the
consideration therefor described herein, the Preferred Shares
will be duly authorized, validly issued, fully paid and
nonassessable.  Upon completion of the transaction contemplated
hereunder, the shares of common stock, par value $0.01 per share
of Holdings (the "Common Stock") will be duly authorized and
reserved for issuance and, upon conversion in accordance with the
terms of the Preferred Stock, will be validly issued, fully paid
and nonassessable and will not be subject to any preemptive or
similar rights, except as set forth on Schedule 3.3.

     3.4. No Breach.  None of (i) the execution, delivery and
performance of this Agreement by Holdings, (ii) the consummation
of this Agreement and all other documents or instruments related
thereto or executed in connection therewith or in contemplation
of the transaction hereunder, or (iii) Holdings' compliance with
the terms and conditions hereof will, with or without the giving
of notice or the lapse of time or both, conflict with, breach the
terms and conditions of, constitute a default under, or violate
Holdings' Certificate of Incorporation or Bylaws or any judgment,
decree, order or Material Agreement to which Holdings is a party
or by which Holdings is legally bound, or any law, rule or
regulation applicable to Holdings.

     3.5. Capitalization.

               (a)  The authorized capital stock of Holdings consists of 3,000
shares of Common Stock and 1,000 shares of preferred stock, of
which 100 shares have been designated Series A Convertible
Preferred Stock and 20 shares have been designated Preferred
Stock.  As of the date hereof, 593.5 shares of Common Stock are
outstanding and 100 shares of preferred stock (which have been
designated Series A Convertible Preferred Stock) are outstanding.
As of the date hereof, 255 shares of Common Stock are reserved
for issuance upon exercise of outstanding options to purchase
shares of Common Stock and 100 shares of Common Stock are
reserved for issuance upon the conversion of the 100 shares of
outstanding Series A Convertible Preferred Stock.  Except as set
forth on Schedule 3.5 hereto, Holdings does not have outstanding
any other stock or securities convertible or exchangeable for any
shares of its capital stock or containing any profit
participation features, nor does it have outstanding any rights,
options or warrants to subscribe for or to purchase its capital
stock or any stock or securities convertible into or exchangeable
for its capital stock or any stock appreciation rights or phantom
stock plans, nor has it reserved any shares of capital stock for
issuance upon exercise or conversion of any rights, options or
warrants to subscribe for or to purchase its capital stock or any
stock or securities convertible into or exchangeable for its
capital stock.  Holdings is not a party to any agreement which
requires Holdings to repurchase or otherwise acquire or retire
any shares of its capital stock or any warrants, options or other
rights to acquire its capital stock, except as set forth on the
Schedule 3.5.

               (b)  Except as set forth on Schedule 3.5, there are no statutory
or contractual stockholders' preemptive rights or rights of
refusal with respect to the issuance of capital stock of
Holdings.  Except as set forth on Schedule 3.5, there are no
agreements to which Holdings or any holders of the capital stock
of Holdings is a party with respect to the voting or transfer of
the capital stock of Holdings.

               (c)  All of the outstanding shares of Holdings' capital stock are
duly authorized, validly issued, fully paid and nonassessable
with the rights specified in Holdings' Certificate of
Incorporation, and free of liens or restrictions other than as
stated herein.

     3.6. Consents and Approvals.  Except as set forth on
Schedule 3.6, no consent, approval, order, authorization of, or
declaration, filing, or registration with, any Governmental
Entity is required to be obtained or made by Holdings in
connection with the execution and delivery by Holdings of this
Agreement or the consummation of the transaction contemplated
hereby, other than any such consent, approval, order,
authorization, declaration, filing or registration , the failure
of which to seek or maintain does not individually or in the
aggregate, have a Material Adverse Effect on Holdings.  No
consent or approval of any person other than any Governmental
Entity is required to be obtained or made by Holdings in
connection with the execution and delivery by Holdings of this
Agreement or the consummation of the transaction contemplated
hereby.

     3.7. Subsidiaries.

               (a)  Other than PerImmune, Inc., Holdings does not own, directly
or indirectly, capital stock or other securities of any
corporation or partnership or have any direct or indirect equity
ownership interest in any other Person.

               (b)  PerImmune, Inc. is a corporation duly organized, validly
existing, and in good standing under the laws of the State of
Delaware and has full power and authority to conduct its business
as currently conducted.

               (c)  The authorized capital stock of PerImmune, Inc. consists of
100,000 shares of Common Stock. As of the date hereof, 1,000
shares of Common Stock are outstanding.  Except as set forth on
Schedule 3.7, PerImmune, Inc. does not have outstanding any other
stock or securities convertible or exchangeable for any shares of
its capital stock or containing any profit participation
features, nor does it have outstanding any rights, options or
warrants to subscribe for or to purchase its capital stock or any
stock or securities convertible into or exchangeable for its
capital stock or any stock appreciation rights or phantom stock
plans, nor has it reserved any shares of capital stock for
issuance upon exercise or conversion of any rights, options or
warrants to subscribe for or to purchase its capital stock or any
stock or securities convertible into or exchangeable for its
capital stock.  PerImmune, Inc. is not a party to any agreement
which requires it to repurchase or otherwise acquire or retire
any shares of its capital stock or any warrants, options or other
rights to acquire its capital stock.

     3.8. Private Offering.  No form of general solicitation or
general advertising was used by Holdings or its representatives
in connection with the offer or sale of the Preferred Shares.
Assuming the accuracy of the representations and warranties of
Purchaser in Section 4.5 hereof, no registration of the Preferred
Shares pursuant to the provisions of the Securities Act or any
state securities or "blue sky" laws will be required by the
offer, sale or issuance of the Preferred Shares pursuant to this
Agreement.

     3.9. Liabilities.  Except as set forth on Schedule 3.9,
Holdings has no material liabilities or obligations of any nature
(whether absolute, accrued, contingent or otherwise and whether
matured or unmatured) relating to its business that are of a
nature required to be set forth on a balance sheet in accordance
with GAAP, except (i) liabilities or obligations reflected and
reserved for on the balance sheet dated December 31, 1996, (ii)
liabilities or obligations incurred since December 31, 1996 in
the ordinary course of business, (iii) liabilities which have
been disclosed herein or in the schedules hereto, or (iv)
liabilities arising under or contemplated by this Agreement.

     3.10.     Compliance With Laws.  Except as set forth on
Schedule 3.10, (i) each of Holdings and PerImmune is in
compliance with all Applicable Laws other than violations which
do not, and will not, individually or in the aggregate, have a
Material Adverse Effect on Holdings or PerImmune, as the case may
be; (ii) each of Holdings and PerImmune has obtained and holds
all material permits, licenses, variances, exemptions, orders,
franchises, approvals and authorizations of all Governmental
Entities necessary for the lawful conduct of its business or the
lawful ownership, use and operation of its assets, except when
the failure to do so does not and will not, individually or in
the aggregate, have a Material Adverse Effect on Holdings or
PerImmune, as the case may be; and (iii) neither Holdings nor
PerImmune has received any written notice of violation of any
Applicable Law, which has not been dismissed or otherwise
disposed of, that Holdings or PerImmune (as applicable) has not
so complied other than with respect to violations of Applicable
Law which do not, and will not, individually or in the aggregate,
have a Material Adverse Effect on Holdings or PerImmune, as the
case may be.

     3.11.     Litigation.  Except as set forth on Schedule 3.11,
(i) neither Holdings or PerImmune nor any of their respective
assets is a party or subject to any filed litigation or
arbitration proceeding; and (ii) neither Holdings nor PerImmune
has received written notice of any governmental investigation or
proceeding involving Holdings, PerImmune or any of their
respective assets, nor to their knowledge is any litigation
threatened.

     3.12.     Tax Matters.  Except as otherwise set forth on
Schedule 3.12,

               (a)  There have been properly completed and filed on a timely
basis and in correct form all Returns required to be filed on or
prior to the date hereof, except for any Returns, the failure of
which to file, would not have a Material Adverse Effect on
Holdings or PerImmune, as applicable.  As of the time of filing,
the foregoing Returns correctly reflected the facts regarding the
income, business, assets, operations, activities, status, or
other matters of Holdings or PerImmune, as applicable, or any
other information required to be shown thereon.

               (b)  With respect to all amounts in respect of Taxes imposed on
Holdings or PerImmune or for which Holdings or PerImmune is or
could be liable, whether to taxing authorities (as, for example,
under law) or to other persons or entities (as, for example,
under tax allocation agreements), with respect to all taxable
periods or portions of periods ending on or before the date
hereof, all applicable tax laws and agreements have been fully
complied with, and all such amounts required to be paid by
Holdings or PerImmune, as applicable, to taxing authorities or
others on or before the date hereof have been paid, except for
such laws and agreements, the failure with which to comply, and
such amounts the failure of which to pay, would not have a
Material Adverse Effect on Holdings or PerImmune, as applicable.

     3.13.     Title to Assets, Etc.  Except for Permitted
Encumbrances, each of Holdings and PerImmune has good and
marketable title to or valid and subsisting leasehold interests
in all assets  material to their businesses as currently
conducted and, except as set forth on Schedule 3.13, none of the
material assets is subject to any Encumbrance, except for
Encumbrances which, individually or in the aggregate, are not
substantial in amount and do not materially detract from the
value of the property or assets of Holdings or PerImmune (as
applicable) or interfere with the present use of such property or
assets (taken as a whole) and have not arisen other than in the
ordinary course of business.  Each of Holdings and PerImmune has
in all material respects performed all the obligations required
to be performed by it with respect to all material assets leased
by it through the date hereof, except where the failure to
perform would not have a Material Adverse Effect on Holdings or
PerImmune (as applicable).  All such leases are valid, binding
and enforceable with respect to Holdings or PerImmune (as
applicable) in accordance with their terms and are in full force
and effect; no event of default has occurred which constitutes a
default thereunder on the part of Holdings or PerImmune (as
applicable) and neither Holdings nor PerImmune has knowledge of
the occurrence of any event of default which constitutes a
default thereunder by any other party which defaults are
reasonably likely to have a Material Adverse Effect on it.

     3.14.     Contracts; No Defaults.

               (a)  Schedule 3.14 contains a listing of each Material Agreement.
True, correct and complete copies of each Material Agreement have
been delivered to or made available to Purchaser and its agents
and representatives.

               (b)  Except as set forth on Schedule 3.14, all of the Material
Agreements of Holdings and PerImmune are (i) in full force and
effect, (ii) represent the legal, valid and binding obligations
of Holdings or PerImmune, as applicable, and are enforceable
against Holdings or PerImmune, as applicable, in accordance with
their terms and (iii) to the best knowledge of Holdings or
PerImmune, as applicable, represent the legal, valid and binding
obligations of the other parties thereto and are enforceable
against such parties in accordance with their terms.  Except as
set forth on Schedule 3.14, no condition exists or event has
occurred which, with notice or lapse of time or both, would
constitute a material default or a basis for force majeure or the
claim of excusable delay or nonperformance under such Material
Agreements.

     3.15.     Intellectual Property.

               (a)  Each of Holdings and PerImmune either owns or has valid
licenses or other rights to use all patents, copyrights,
trademarks, software, databases, data, other technical
information used in their businesses as presently conducted
("Proprietary Rights"), subject to the limitations contained in
the agreements governing the use of the same, with such
exceptions as would not result in a Material Adverse Effect on
Holdings. There are no limitations contained in the agreements of
the type described in the immediately preceding sentence which,
upon consummation of the transaction contemplated hereunder, will
alter or impair any such rights, breach any such agreement with
any third party vendor, or require payments of additional sums
thereunder, except any such limitations that would not have a
Material Adverse Effect on Holdings or PerImmune, as applicable.
Each of Holdings and PerImmune is in compliance in all material
respects with such licenses and agreements and, except as set
forth on Schedule 3.15, there are no pending or, to the best
knowledge of Holdings, threatened proceedings challenging or
questioning the validity or effectiveness of any license or
agreement relating to such property or the right of Holdings or
PerImmune to use, copy, modify or distribute the same.

               (b)  No person has a right, other than those set forth on
Schedule 3.15 to receive a royalty or similar payment in respect
of any material Proprietary Rights whether or not pursuant to any
contractual arrangements entered into by Holdings or PerImmune.

     4.   REPRESENTATIONS AND WARRANTIES OF PURCHASER.  Purchaser
makes the following representations and warranties to Holdings:

     4.1. Organization.  Purchaser is a corporation duly
organized, validly existing, and in good standing under the laws
of the State of Minnesota, and has full power and authority to
conduct its business as currently conducted and to enter into and
perform this Agreement.

     4.2. Authorization.  The execution, delivery and performance
of this Agreement by Purchaser have been duly authorized by all
necessary corporate action on the part of Purchaser.  This
Agreement has been duly executed by Purchaser and delivered to
Holdings and constitutes the legal, valid and binding obligation
of Purchaser, enforceable in accordance with its terms except as
its enforceability may be limited by bankruptcy, insolvency or
other laws affecting creditors' rights generally and the exercise
of judicial discretion in accordance with general equitable
principles.

     4.3. No Breach.  None of (i) the execution, delivery and
performance of this Agreement by Purchaser, (ii) the consummation
of this Agreement and all other documents or instruments related
thereto or executed in connection therewith or in contemplation
of the transaction hereunder, or (iii) Purchaser's compliance
with the terms and conditions hereof will, with or without the
giving of notice or the lapse of time or both, conflict with,
breach the terms and conditions of, constitute a default under,
or violate Purchaser's charter or Bylaws, or any judgment,
decree, order or material agreement to which Purchaser is a party
or by which Purchaser is legally bound, or any law, rule or
regulation applicable to Purchaser.

     4.4. Consents and Appeals.  Except as set forth on Schedule
4.4, no consent, approval, order or authorization of, or
declaration, filing or registration with, any Government Entity
is required to be obtained or made by Purchaser in connection
with the execution and delivery by Purchaser of this Agreement or
the consummation of the transaction contemplated hereby.  No
consent or approval of any person other than any Governmental
Entity is required to be obtained or made by Purchaser in
connection with the execution and delivery by Purchaser of this
Agreement or the consummation of the transaction contemplated
hereby.

     4.5. Sophistication, Purchase for Own Account.

               (a)  Sophistication, etc.  Purchaser is knowledgeable,
sophisticated and experienced in business and financial matters;
is able to bear the economic risks of its investment in the
Preferred Shares and is presently able to afford the complete
loss of such investment; and has been afforded access to
information about Holdings and its financial condition, results
of operations, business, property, management and prospects
sufficient to enable it to evaluate its investment in Holdings.
Purchaser represents that it is an "accredited investor" as such
term is defined in Rule 501(a) of Regulation D under the
Securities Act of 1933, as amended (the "Securities Act").

               (b)  Purchase for Own Account.  The Preferred Shares, and the
shares of Common Stock to be issued upon conversion of the
Preferred Shares, are being or will be acquired by Purchaser (as
applicable) for its own account and with no intention of
distributing or reselling such securities or any part thereof in
any transaction that would be in violation of the Securities Act
or the securities laws of any state, without prejudice, however,
to the rights of Purchaser at all times to sell or otherwise
dispose of all or any part of the Preferred Shares or the shares
of Common Stock issuable upon conversion of the Preferred Shares
under an effective registration statement under the Securities
Act or pursuant to an exemption from such registration available
under the Securities Act, and subject, nevertheless, to the
disposition of such Purchaser's property being at all times
within its control.  If Purchaser should in the future decide to
dispose of any of the Preferred Shares or the shares of Common
Stock issuable upon conversion of the Preferred Shares, Purchaser
understands and agrees that it may do so only in compliance with
the Securities Act and applicable state securities laws, as then
in effect.  Such Purchaser agrees to the imprinting, so long as
required by law, of a legend on certificates representing all of
the Preferred Shares or the shares of Common Stock to be issued
upon conversion of the Preferred Shares to the following effect:

     "THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE
     NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
     AS AMENDED, OR THE SECURITIES LAWS OF ANY STATE AND MAY
     NOT BE SOLD OR OTHERWISE DISPOSED OF EXCEPT PURSUANT TO
     AN EFFECTIVE REGISTRATION STATEMENT UNDER SUCH ACT AND
     APPLICABLE STATE SECURITIES LAWS OR PURSUANT TO AN
     APPLICABLE EXEMPTION TO THE REGISTRATION REQUIREMENTS
     OF SUCH ACT OR SUCH LAWS.
     
     5.   CLOSING.

     5.1. Closing Date.  The consummation of the purchase of the
Preferred Shares contemplated hereby (the "Closing") shall take
place within thirty days of the date hereof (the "Closing Date").
The Closing shall take place at the offices of PerImmune
Holdings, Inc. at 1330 Piccard Drive, Rockville, Maryland, and
shall be effective as of 12:01 a.m. on the Closing Date.

     5.2. Performance at Closing.  The following deliveries shall
be made at Closing:

     5.2.1.    By Purchaser.  Purchaser shall deliver to
Holdings:

                    (a)  To an account designated by Holdings, the Purchase 
Price by wire transfer of immediately available funds; and

                    (b)  Such other documents as may be reasonably requested by
Holdings' counsel.

     5.2.2.    By Holdings.  Holdings shall deliver to Purchaser:

                    (a)  A certificate evidencing the Preferred Shares, which 
shall be registered in Purchaser's name; and

                    (b)  Such other documents as may be reasonably requested by
Purchaser's counsel.

     5.3. Other Documents and Acts.

               (a)  The parties will execute such other documents and perform
such other acts, after the Closing Date, as may be necessary for
the complete implementation and consummation of this Agreement.

               (b)  At Closing, Holdings and the Purchaser will execute and
deliver the Registration Rights Agreement.

     5.4. Certificates; Opinions.  At Closing, the Purchaser and
Holdings will deliver the certificates and opinion of counsel
specified in Sections 6.1(c) and 6.2(c)-(d), respectively, in
form and substance reasonably satisfactory to the parties'
respective counsel.

     6.   CONDITIONS TO CLOSING.

     6.1. Conditions to Holdings' Obligations.  The obligations
of Holdings to consummate the transaction contemplated hereby on
the Closing Date is subject to the satisfaction or waiver on or
prior to the Closing Date, of each of the following conditions:

               (a)  Consents.  All Permits and waivers from Governmental
Entities and all consents, approvals, permits and waivers from
other parties necessary to permit Purchaser and Holdings to
consummate the transaction contemplated hereby, shall have been
obtained, unless the failure to obtain any such Permit or waiver
from a Governmental Entity or any other consent, approval, permit
or waiver would not have a Material Adverse Effect upon Holdings.

               (b)  No Governmental or Other Proceedings or Litigation.  There
shall be no injunction or court order restraining consummation of
the transaction contemplated hereunder and there shall be no
pending or threatened action or proceeding by or before a court
or governmental body brought by or on behalf of any Governmental
Entity seeking to restrain or invalidate all or any portion of
the transactions contemplated hereunder, and there shall not have
been adopted any law or regulation making all or any portion of
the transaction contemplated hereunder illegal.

               (c)  Certificates.  Purchaser will furnish Holdings with such
certificates, in form and substance satisfactory to Holdings, of
the Chief Executive Officer and the Secretary of Purchaser and
others to evidence compliance with the conditions set forth in
this Article 6.

     6.2. Conditions to Purchaser's Obligations.  The obligation
of Purchaser to consummate the transaction contemplated hereby on
the Closing Date is subject to the satisfaction or waiver on or
prior to the Closing Date of each of the following conditions:

               (a)  Consents.  All Permits and waivers from Governmental
Entities and all consents, approvals, permits and waivers from
other parties necessary to permit Purchaser and Holdings to
consummate the transaction contemplated hereby, shall have been
obtained, unless the failure to obtain any such Permit or waiver
from a Governmental Entity or any other consent, approval, permit
or waiver would not have a Material Adverse Effect upon Holdings
or Purchaser.

               (b)  No Governmental or Other Proceedings or Litigation.  There
shall be no injunction or court order restraining consummation of
the transaction contemplated hereunder and there shall be no
pending or threatened action or proceeding by or before a court
or governmental body brought by or on behalf of any Governmental
Entity seeking to restrain or invalidate all or any portion of
the transactions contemplated hereunder, and there shall not have
been adopted any law or regulation making all or any portion of
the transaction contemplated hereunder illegal.

               (c)  Opinion of Counsel.  Holdings shall have delivered to
Purchaser the opinion of Latham & Watkins, counsel to Holdings,
with respect to the matters set forth on Exhibit C hereto.

               (d)  Certificates.  Holdings shall furnish Purchaser with such
certificates, in form and substance satisfactory to Purchaser, of
the Chief Executive Officer and the Secretary of Holdings and
others to evidence compliance with the conditions set forth in
this Article 6.

(e)  Certificate of Designations.  Holdings shall have adopted
the Certificate of Designations, the Certificate of Designations
shall have been appropriately filed with the Secretary of State
of Delaware and Holdings shall have provided the Purchaser with
evidence of such adoption and filing.
     7.   ADDITIONAL AGREEMENTS OF PURCHASER AND HOLDINGS.

     7.1. Prohibition on Sale; Right of First Offer.

               (a)  Purchaser hereby covenants and agrees that it will not sell,
transfer, convey, assign, pledge, hypothecate or otherwise
dispose of the Preferred Shares (or any interest therein) without
the prior written consent of Holdings (which consent will not be
unreasonably withheld).

               (b)  Notwithstanding Section 7.1(a) above, in the event that a
Qualifying IPO (as defined in the Certificate of Designations),
does not occur within nine months after the date hereof,
Purchaser may at any time thereafter offer to sell or otherwise
dispose of all or any portion of the Preferred Shares to any
Person other than Holdings in accordance with the provisions
below.  If Purchaser finds a buyer ("Buyer") for the Preferred
Shares, Purchaser shall notify Holdings of its intent to sell or
otherwise dispose of the Preferred Shares to Buyer.  Purchaser
shall set forth in the notice to Holdings the name of Buyer and
the terms and conditions of the proposed sale or other
disposition, and Holdings shall thereafter have fifteen days
after delivery of such notice to notify Purchaser whether or not
it will purchase the Preferred Shares on the same terms and
conditions set forth in the notice.  If Holdings accepts the
offer, then Holdings shall purchase the Preferred Shares under
the same terms and conditions offered to Buyer, except that
Holdings must make the payment for the Preferred Shares within
thirty days after accepting the offer to purchase the Preferred
Shares.  If Holdings declines to accept the offer or if it
accepts the offer but fails to purchase the Preferred Shares
within the requisite time frame, then Purchaser may sell the
Preferred Shares to Buyer or any other buyer at any time
thereafter so long as the terms and conditions of such sale or
other disposition are no more favorable to Buyer or other buyer
as set forth in the notice to Holdings.  In the event that the
proposed purchase price to Buyer or other buyer is later adjusted
to a price lower than the price originally set forth in the
written notice to Holdings, Purchaser must provide a second
written notice to Holdings setting forth the lower price and
giving Holdings another opportunity to purchase the Offered
Shares for the lower price; if Holdings accepts the new offer to
purchase the Preferred Shares at the lower price it must pay the
purchase price within ten days after receipt of the second notice
from Purchaser.

     7.2. Lock-Up Agreement; Sale After Lock-Up Period.

               (a)  Purchase hereby covenants and agrees that it will sign any
reasonable "lock-up" letter with terms and conditions
substantially the same as any lock-up letter that certain
officers, directors or other significant stockholders are
requested to sign restricting Purchaser's ability to sell,
transfer, convey, assign, pledge, hypothecate, or otherwise
dispose of securities of Holdings for a period of up to 180 days
after a Qualifying IPO (the "Lock-Up Period"), as may be
requested by underwriters in connection with such Qualifying IPO.

               (b)  After the Lock-Up Period, if any, Purchaser may sell or
otherwise dispose of Common Stock of Holdings at any time without
restriction (other than under applicable law) so long as:  (i)
the net proceeds of any such sale or sales do not exceed the
Purchase Price, (ii) Purchaser provides ten days' prior written
notice to Holdings prior to any such sale, and (iii) Holdings is
given the opportunity to purchase the subject securities from
Purchaser at the prevailing market price during such ten-day
period.

               (c)  After the Lock-Up Period and so long as the distribution
agreement, dated June 16, 1997, between Holdings and Purchaser
remains in effect, Purchaser may also sell or otherwise dispose
of additional securities of Holdings (beyond the number of shares
allowed under Section 7.2(b)) at the prevailing market price so
long as:  (i) Purchaser provides Holdings with three business
days' prior notice each time it intends to sell any additional
securities, (ii) Holdings is given the opportunity to purchase
such additional securities during said three business day period,
and (iii) following any such sale, Purchaser continues to hold at
least fifty percent (50%) of the shares of Common Stock initially
held by Purchaser upon conversion of the Preferred Stock in
connection with the Qualifying IPO.  Upon termination or
expiration of said distribution agreement or in the event that
Holdings is in material default thereunder and the default is not
cured within 30 days, Purchaser may at any time sell any
additional securities of Holdings in its possession without the
restrictions set forth above.

               (d)  For the purpose of this Section 7.2, the term "market price"
shall mean (i) the average of the closing price of a share of
common stock on the principal exchange on which shares of common
stock are then trading, if any, during such ten-day period, or
(ii) if such common stock is not traded on an exchange but is
quoted on Nasdaq or a successor quotation system, (1) the
average, during such ten day period, of the last sales price (if
the common stock is then listed as a National Market Issue under
the Nasdaq National Market System) or (2) the average of the mean
between the closing representative bid and asked prices for each
day during such ten-day period (in all other cases) for common
stock as reported by Nasdaq or such successor quotation system,
or (iii) if the common stock is not publicly traded on an
exchange and not quoted on Nasdaq or a successor quotation
system, the average of the mean between the closing bid and asked
prices for the common stock for each day during the ten day
period.

     7.3. Reservation of Shares.  Until all Preferred Shares are
no longer outstanding due to conversion or otherwise, Holdings
shall at all times reserve and keep available out of its
authorized Common Stock, solely for the purpose of issue or
delivery upon conversion of the Preferred Shares as provided in
the Certificate of Designations, the maximum number of shares of
Common Stock that may be issuable or deliverable upon such
conversion.  Such shares of Common Stock shall, when issued or
delivered in accordance with the provisions of the Certificate of
Designations, be duly authorized, validly issued and fully paid
and non-assessable.  Holdings shall issue such Common Stock in
accordance with the provisions of the Certificate of Designations
and shall otherwise comply with the terms thereof.

     7.4. Registration Rights Agreement.  On the Closing Date,
Holdings and Purchaser shall enter into the Registration Rights
Agreement.

     8.   INDEMNIFICATION.

     8.1. Survival of Representations, Etc.  The representations,
warranties, covenants and agreements of the parties hereto
contained herein, shall survive the Closing, but, other than
those contained in Section 3.1, 3.3, 3.5 and 7.1 through 7.4,
shall terminate on the date twelve months from the Closing Date;
provided, however, that there shall be no such termination with
respect to any representation or warranty as to which a bona fide
claim has been asserted prior to such date.

     8.2. Indemnification by Holdings.  Holdings shall indemnify
and hold harmless Purchaser and its Affiliates, directors,
officers, advisors, agents and employees (the "Purchaser
Indemnified Parties") to the fullest extent lawful, from and
against any and all demands, losses, damages, penalties, claims,
liabilities, obligations, actions, causes of action, and
reasonable expenses (including without limitation, costs of
investigating, preparing or defending any such claim or action
and reasonable legal fees and expenses) (collectively, "Losses"),
arising by reason of or resulting from any breach of any
warranty, representation, covenant or agreement of Holdings
contained in this Agreement or in any certificate delivered
pursuant thereto; provided, however, that no Purchaser
Indemnified Party shall be entitled to indemnification by
Holdings hereunder with respect to any Losses arising solely from
the bad faith or gross negligence (as finally determined by a
court of competent jurisdiction) of such Purchaser Indemnified
Party or any Affiliate, director, officer, agent, or employee of
such Purchaser Indemnified Party.

     8.3. Indemnification by Purchaser.  Purchaser shall
indemnify and hold harmless Holdings and its Affiliates,
directors, officers, advisors, agents and employees (the
"Holdings Indemnified Parties") to the fullest extent lawful,
from and against any and all Losses arising by reason of or
resulting from any breach of any warranty, representation,
covenant or agreement of such Purchaser contained in this
Agreement or in any certificate delivered pursuant thereto,
provided, however, that no Holdings Indemnified Party shall be
entitled to indemnification by Purchaser hereunder with respect
to any Losses arising solely from the bad faith or gross
negligence (as finally determined by a court of competent
jurisdiction) of such Holdings Indemnified Party, or any
Affiliate, director, officer, agent or employee of such Holdings
Indemnified Party.

     8.4. Losses.  The term "Losses" as used in this Section 8 is
not limited to matters asserted by third parties, but includes
Losses incurred or sustained by an Indemnified Party in the
absence of third party claims.  Payments by an Indemnified Party
of amounts for which such Indemnified Party is indemnified
hereunder shall not necessarily be a condition precedent to
recovery.

     8.5. Defense of Claims.  If a claim for Losses (a "Claim")
is to be made by an Indemnified Party, such Indemnified Party
shall give written notice (a "Claim Notice") to the indemnifying
party as soon as practicable after such Indemnified Party becomes
aware of any fact, condition or event which may give rise to
Losses for which indemnification may be sought under this Section
8.  If any lawsuit or enforcement action is filed against any
Indemnified Party hereunder, notice thereof (a "Third Party
Notice") shall be given to the indemnifying party as promptly as
practicable (and in any event within fifteen (15) calendar days
after the service of the citation or summons).  The failure of
any Indemnified Party to give timely notice hereunder shall not
affect rights to indemnification hereunder, except to the extent
that the indemnifying party demonstrates actual damage caused by
such failure.  After receipt of a Third Party Notice, if the
indemnifying party shall acknowledge in writing to the
Indemnified Party that the indemnifying party shall be obligated
under the terms of its indemnity hereunder in connection with
such lawsuit or action, then the indemnifying party shall be
entitled, if it so elects, (i) to take control of the defense and
investigation of such lawsuit or action, (ii) to employ and
engage attorneys of its own choice to handle and defend the same,
at the indemnifying party's cost, risk and expense unless the
named parties to such action or proceeding include both the
indemnifying party and the Indemnified Party and the Indemnified
Party has been advised in writing by counsel that there may be
one or more legal defenses available to such Indemnified Party
that are different from or additional to those available to the
indemnifying party, and (iii) to compromise or settle such claim,
which compromise or settlement shall be made only with the
written consent of the Indemnified Party, such consent not to be
unreasonably withheld.  The Indemnified Party shall cooperate in
all reasonable respects with the indemnifying party and such
attorneys in the investigation, trial and defense of such lawsuit
or action and any appeal arising therefrom; and the Indemnified
Party may, at its own cost, participate in the investigation,
trial and defense of such lawsuit or action and any appeal
arising therefrom and appoint its own counsel therefor, at its
own cost.  The parties shall also cooperate with each other in
any notifications to insurers.  If the indemnifying party fails
to assume the defense of such claim within fifteen (15) calendar
days after receipt of the Third Party Notice, the Indemnified
Party against which such claim has been asserted will (upon
delivering notice to such effect to the indemnifying party) have
the right to undertake the defense, compromise or settlement of
such claim and the indemnifying party shall have the right to
participate therein at its own cost; provided, however, that such
claim shall not be compromised or settled without the written
consent of the indemnifying party, which consent shall not be
unreasonably withheld.  In the event the Indemnified Party
assumes the defense of the claim the Indemnified Party will keep
the indemnifying party reasonably informed of the progress of any
such defense, compromise or settlement.  Notwithstanding the
foregoing, the indemnifying party shall not be liable for the
reasonable fees and expenses of more than one separate firm of
attorneys at any time for any and all Indemnified Parties (which
firm shall be designated in writing by such Indemnified Party or
Parties) in connection with any one such action or proceeding
arising out of the same general allegations or circumstances.

     8.6. Tax Treatment of Indemnity.  The parties agree that any
indemnification payments made pursuant to this Agreement shall be
treated for Tax purposes as an adjustment to the consideration
for the purchase of the Preferred Shares, unless otherwise
required by applicable law, in which event indemnification
payments shall be made in an amount sufficient to indemnify the
party on a net after-Tax basis.

     9.   GENERAL PROVISIONS.

     9.1. Expenses.  Except as otherwise provided herein, all
expenses involved in the preparation and consummation of this
Agreement shall be borne by the party incurring the same whether
or not the transaction contemplated hereby is consummated.

     9.2. Notices.  All notices, requests, demands, and other
communications pertaining to this Agreement shall be in writing
and shall be deemed duly given when delivered personally (which
shall include delivery by Federal Express or other nationally
recognized, reputable overnight courier service that issues a
receipt or other confirmation of delivery) to the party for whom
such communication is intended, or three (3) business days after
the date mailed by certified or registered U.S. mail, return
receipt requested, postage prepaid, addressed as follows:

          (a)  If to Purchaser:

               Mentor Corporation
               5425 Hollister Avenue
               Santa Barbara, CA  93111
               Attn:  General Counsel

          (b)  If to Holdings:

               PerImmune, Inc.
               1330 Piccard Drive
               Rockville, MD 20850-4396
               Attn:  Michael G. Hanna, Jr., Ph.D.

               with a copy to:

               Latham & Watkins
               1001 Pennsylvania Avenue, N.W.
               Suite 1300
               Washington, D.C.  20004
               Attn:  Bruce E. Rosenblum

Any party may change its address for notices by notice to the
other given pursuant to this Section 9.

     9.3. Brokers.  Each party represents and warrants to the
other that no agent, broker, investment banker, or other person
or firm acting on behalf of such party or any of its affiliates
or under the authority of any of them is or will be entitled to
any broker's or finder's fee or any other commission or similar
fee in connection with the transaction contemplated hereby, other
than Craigie Incorporated, whose fees will be solely the
responsibility of Holdings.

     9.4. Waiver.  Unless otherwise specifically agreed in
writing to the contrary:  (i) the failure of either party at any
time to require performance by the other of any provision of this
Agreement shall not affect such party's right thereafter to
enforce the same; (ii) no waiver by either party of any default
by any other shall be valid unless in writing and acknowledged by
an authorized representative of the non-defaulting party, and no
such waiver shall be taken or held to be a waiver by such party
of any other preceding or subsequent default; and (iii) no
extension of time granted by either party for the performance of
any obligation or act by any other party shall be deemed to be an
extension of time for the performance of any other obligation or
act hereunder.

     9.5. Entire Agreement.  This Agreement, the exhibits and
schedules hereto (which are incorporated by reference herein)
constitute the entire agreement between the parties with respect
to the subject matter hereof and referenced herein, supersede and
terminate any prior agreements between the parties (written or
oral).  This Agreement may not be altered or amended except by an
instrument in writing signed by the party against whom
enforcement of any such change is sought.

     9.6. Counterparts.  This Agreement may be signed in any
number of counterparts with the same effect as if the signatures
on each such counterpart were on the same instrument.

     9.7. Construction.  The Section headings of this Agreement
are for convenience only and in no way modify, interpret or
construe the meaning of specific provisions of the Agreement.

     9.8. Severability.  If any one or more of the provisions
contained in this Agreement should be found invalid, illegal or
unenforceable in any respect, the validity, legality, and
enforceability of the remaining provisions contained herein shall
not in any way be affected or impaired thereby.  Any illegal or
unenforceable term shall be deemed to be void and of no force and
effect only to the minimum extent necessary to bring such term
within the provisions of applicable law and such term, as so
modified, and the remaining provisions of this Agreement shall
then be fully enforceable.

     9.9. Choice of Law.  This Agreement shall be governed by and
construed in accordance with the laws of the State of Maryland
without regard to the choice of law rules utilized in that
jurisdiction.

          IN WITNESS WHEREOF, each of the parties has caused this
Agreement to be executed by a respective duly authorized officer
as of the date first written above.


                         PERIMMUNE HOLDINGS, INC.


                         By:  /s/MICHAEL G. HANNA
                              Michael G. Hanna, President


                         MENTOR CORPORATION


                         By:  /s/CHRISTOPHER CONWAY
                              Name:  Christopher Conway
                              Title:  Chairman, CEO



                     SCHEDULES AND EXHIBITS


     The Registrant will make the following schedules and
exhibits available upon request:


          Schedule 3.3                  Pre-emptive Rights

          Schedule 3.5                  Capitalization

          Schedule 3.6                  Consent and Approvals

          Schedule 3.7                  Subsidiaries

          Schedule 3.9                  Liabilities

          Schedule 3.10                 Non-compliance with Laws

          Schedule 3.11                 Litigation

          Schedule 3.12                 Tax Matters

          Schedule 3.13                 Title to Assets

          Schedule 3.14                 Contracts

          Schedule 3.15                 Intellectual Property

          Exhibit A                Form of Certificate of
                                   Designations, Preferences and
                                   Relative, Participating
                                   Optional and other Special
                                   Rights and Qualifications,
                                   Limitations and Restrictions
                                   Thereof of Series B
                                   Convertible Preferred Stock of
                                   Perimmune Holdings, Inc.

          Exhibit B                Form of Registration Rights
Agreement.


          



                                
DC_DOCS\84553.4
                    STOCK PURCHASE AGREEMENT
                                
          This Stock Purchase Agreement ("Agreement") is made and
entered into this 22nd day of December, 1997, between PERIMMUNE
HOLDINGS, INC., a Delaware corporation ("Holdings"), and MENTOR
CORPORATION, a Minnesota Corporation ("Purchaser").

          WHEREAS, Purchaser currently holds 20 shares of Series
B Convertible Preferred Stock, par value $0.01 per share of
Holdings which have certain rights, designations and preferences
set forth in the Certificate of Designations (as defined herein)
(the "Preferred Stock");

          WHEREAS, subject to, and in accordance with, the terms
hereof, Holdings desires to issue and sell to Purchaser, and
Purchaser desires to purchase and acquire from Holdings, 100
shares of the Preferred Stock with an aggregate liquidation
preference of Five Million Dollars ($5,000,000) (the "Preferred
Shares"); and

          WHEREAS, Holdings holds all of the issued and
outstanding shares of capital stock of PERIMMUNE, INC., a
Delaware corporation.

          Accordingly, in consideration of the foregoing and of
the mutual promises, covenants, and conditions set forth below,
the parties hereby agree as follows:

I.
DEFINITIONS

          As used herein, the terms below shall have the
following meanings:

          "Affiliate" shall mean any entity controlling,
controlled by or under common control with a Person.  For the
purposes of this definition, "control" shall have the meaning
presently specified for that word in Rule 405 promulgated by the
SEC under the Securities Act.

          "Agreement" shall mean this Stock Purchase Agreement,
together with all schedules and exhibits referenced herein.

          "Amended and Restated Registration Rights Agreement"
means the Amended and Restated Registration Rights Agreement by
and among Holdings and Purchaser substantially in the form
attached hereto as Exhibit A.

          "Applicable Law" means any statute, law, rule, or
regulation or any judgment, order, writ, injunction or decree of
any Governmental Entity to which a specified person or property
is subject.

          "Certificate of Amendment" means the Certificate of
Amendment to the Certificate of Designations, Preferences and
Relative, Participating, Optional and Other Special Rights of
Preferred Stock and Qualifications, Limitations and Restrictions
Thereof, of Series B Convertible Preferred Stock of PerImmune
Holdings, Inc., increasing the number of authorized shares of
Preferred Stock (as defined herein), substantially in the form
attached hereto as Exhibit B.

          "Certificate of Designations" means the Certificate of
Designations, Preferences and Relative, Participating, Optional
and Other Special Rights of Preferred Stock and Qualifications,
Limitations and Restrictions Thereof, of Series B Convertible
Preferred Stock of PerImmune Holdings, Inc., constituting a
portion of the Certificate of Incorporation.

          "Certificate of Incorporation" means the Certificate of
Incorporation of Holdings as amended from time to time and as in
effect on the date hereof.

          "Claim" has the meaning set forth in Section 8.6 of the
Agreement.

          "Claim Notice" has the meaning set forth in Section 8.6
of the Agreement.

          "Closing" has the meaning set forth in Section 5.1 of
the Agreement.

          "Closing Date" has the meaning set forth in Section 5.1
of the Agreement.

          "Code" means the Internal Revenue Code of 1986, as
amended.  All citations to the Code or to the regulations
promulgated thereunder shall include any amendments or any
substitute or successor provisions thereto.

          "Common Stock" has the meaning set forth in Section 3.3
of the Agreement.

          "Encumbrance" means any claim, lien, pledge, option,
charge, easement, security interest, right-of-way, encumbrance or
other rights of third parties, and, with respect to any
securities, any agreements, understandings or restrictions
affecting the voting rights or other incidents of record or
beneficial ownership pertaining to such securities.

          "Governmental Entity" means any court or tribunal in
any jurisdiction (domestic or foreign) or any public,
governmental, or regulatory body, agency, department, commission,
board, bureau, or other authority or instrumentality (domestic or
foreign).

          "Holdings Indemnified Parties" has the meaning set
forth in Section 8.3 of the Agreement.

          "Indemnified Parties" means Holdings Indemnified
Parties and Purchaser Indemnified Parties.

          "Losses" has the meaning set forth in Section 8.2 of
the Agreement.

          "Material Adverse Effect" with respect to any person or
entity shall mean an event, occurrence or condition that has had
or reasonably would be expected to have a material adverse effect
on the business, condition (financial or otherwise), assets,
liabilities, working capital or operations of such person or
entity and its Subsidiaries (if any), taken as a whole.

          "Material Agreement" means, with respect to Holdings or
PerImmune:

               (a)  any contract which involves performance of
     services or delivery of goods and/or materials, by or to
     Holdings or PerImmune of an amount or value in excess of
     $500,000;
     
               (b)  any note, debenture, other evidence of
     indebtedness, guarantee, loan, letter of credit, surety-bond
     or financing agreement or instrument or other contract for
     money borrowed, including any agreement or commitment for
     future loans, credit or financing;
     
               (c)  any lease, rental or occupancy agreement,
     license, installment and conditional sale agreement, and
     other contract affecting the ownership of, leasing of, title
     to, use of, or any leasehold or other interest in, any real
     property;
     
               (d)  any material licensing agreement or other
     contract with respect to patents, trademarks, copyrights, or
     other intellectual property, including agreements with
     current or former employees, consultants or contractors
     regarding the exploitation, appropriation or the
     nondisclosure of Intellectual Property;
     
               (e)  any employment agreement, collective
     bargaining agreement or other contract to or with any
     employee or any labor union or other employee representative
     of a group of employees relating to wages, hours, and other
     conditions of employment;
     
               (f)  any bonus, pension, profit sharing,
     retirement, stock purchase, stock option, deferred
     compensation, medical, hospitalization or life insurance
     plan, contract, understanding with respect to any or all of
     the employees of Holdings or PerImmune;
     
               (g)  any joint venture contract, partnership
     agreement, limited liability company or other contract
     (however named);
     
               (h)  any agreement granting any preemptive right,
     right of first refusal or similar right to any Person;
     
               (i)  any covenant not to compete or other
     restriction on the ability of Holdings or PerImmune to
     conduct its business or engage in any other activity;
     
               (j)  any agreement not made in the ordinary course
     of business that is material to Holdings or PerImmune; and
     
               (k)  any amendment, supplement, and modification
     (whether written or oral) in respect of any of the
     foregoing.
     
          "Permits" shall mean all licenses, permits, orders,
consents, approvals, registrations, authorizations,
qualifications and filings required by any federal, state, local
or foreign laws or governmental or regulatory bodies and all
industry or other non-governmental self-regulatory organizations.

          "Permitted Encumbrances" means (i) any mechanic's or
materialmen's lien or similar Encumbrances with respect to
amounts not yet due and payable or which are being contested in
good faith by appropriate proceedings and for which appropriate
reserves have been established, (ii) Encumbrances for Taxes not
yet due and payable or which are being contested in good faith by
appropriate proceeding, for which appropriate reserves have been
established, or (iii) easements, licenses, covenants, rights of
way and similar Encumbrances which, individually or in the
aggregate, would not materially and adversely affect the
marketability or value of  the property encumbered thereby or
materially interfere with the operations of Holdings or
PerImmune, as applicable.

          "Person" means any individual, copartner, association,
partnership, joint venture, limited liability company, trust,
estate or other entity or organization.

          "Preferred Shares" has the meaning set forth in the
Recital hereto.

          "Preferred Stock" has the meaning set forth in the
Recital hereto.

          "Proprietary Right" has the meaning set forth in
Section 3.15 of the Agreement.

          "Purchase Price" has the meaning set forth in Section 2
of the Agreement.

          "Purchaser Indemnified Party" has the meaning set forth
in Section 8.2 of the Agreement.

          "Return" or "Returns" means all returns, declarations,
reports, statements, and other documents required to be filed in
respect of Taxes.

          "Securities Act" means the Securities Act of 1933, as
amended.

          "Subsidiary" means, with respect to any Person, (a) any
corporation of which at least a majority in interest of the
outstanding voting stock (having by the terms thereof voting
power under ordinary circumstances to elect a majority of the
directors of such corporation, irrespective of whether or not at
the time stock of any other class or classes of such corporation
shall have or might have voting power by reason of the happening
of any contingency) is at the time, directly or indirectly, owned
or controlled by such Person, by one or more Subsidiaries of such
Person, or by such Person and one or more of its Subsidiaries, or
(b) any corporate or non-corporate entity in which such Person,
one or more Subsidiaries of such Person, or such Person and one
or more Subsidiaries of such Person, directly or indirectly, at
the date of determination thereof, has an ownership interest and
100% of the revenue of  which is included in the consolidated
financial reports of such Person consistent with generally
accepted accounting principles.

          "Tax" or "Taxes" means any federal, state, local,
foreign and other net income, gross income, gross receipts,
sales, use, ad valorem, transfer, franchise, profits, license,
lease, service, service use, withholding, payroll, employment,
excise, severance, stamp, occupation, premium, property, windfall
profits, customs, duties or other taxes, fees, assessments, or
charges of any kind whatever, together with any interest and any
penalties, additions to tax, or additional amounts with respect
thereto.

          "Third Party Notice" has the meaning set forth in
Section 8.5 of the Agreement.

II.
ISSUANCE AND SALE OF THE PREFERRED SHARES

          At the Closing, Holdings will issue and sell to
Purchaser, and Purchaser will purchase and acquire from Holdings,
the Preferred Shares for an aggregate purchase price of Five
Million Dollars ($5,000,000) (the "Purchase Price").  The
Preferred Shares will have the respective rights, preferences and
privileges set forth in the Certificate of Incorporation as
amended by the Certificate of Designations and the Supplemental
Certificate of Designations.

III.
REPRESENTATIONS AND WARRANTIES OF HOLDINGS

          Holdings makes the following representations and
warranties to Purchaser:

     3.1. Organization.  Holdings is a corporation duly
organized, validly existing, and in good standing under the laws
of the State of Delaware and has full power and authority to
conduct its business as currently conducted and to enter into and
perform this Agreement.

     3.2. Authorization.  The execution, delivery and performance
of this Agreement and the filing of the Supplemental Certificate
of Designations by Holdings have been duly authorized by all
necessary corporate action on the part of Holdings.  This
Agreement has been duly executed by Holdings and delivered to
Purchaser and constitutes the legal, valid and binding obligation
of Holdings, enforceable in accordance with its terms except as
its enforceability may be limited by bankruptcy, insolvency, or
other laws affecting creditors' rights generally and the exercise
of judicial discretion in accordance with general equitable
principles and as provisions for indemnification, contribution or
waiver of statutory or other rights or remedies may be limited by
public policy considerations.

     3.3. Authorization of Issuance.  Upon issuance by Holdings
as contemplated herein and payment by Purchaser of the
consideration therefor described herein, the Preferred Shares
will be duly authorized, validly issued, fully paid and
nonassessable.  Upon completion of the transaction contemplated
hereunder, the shares of common stock to be issued upon
conversion of the Preferred Shares, par value $0.01 per share of
Holdings (the "Common Stock") will be duly authorized and
reserved for issuance and, upon conversion in accordance with the
terms of the Preferred Stock, will be validly issued, fully paid
and nonassessable and will not be subject to any preemptive or
similar rights, except as set forth on Schedule 3.3.

     3.4. No Breach.  Except as set forth on Schedule 3.4, none
of (i) the execution, delivery and performance of this Agreement
by Holdings, (ii) the consummation of this Agreement and all
other documents or instruments related thereto or executed in
connection therewith or in contemplation of the transaction
hereunder, or (iii) Holdings' compliance with the terms and
conditions hereof will, with or without the giving of notice or
the lapse of time or both, conflict with, breach the terms and
conditions of, constitute a default under, or violate Holdings'
Certificate of Incorporation or Bylaws or any judgment, decree,
order or Material Agreement to which Holdings is a party or by
which Holdings is legally bound, or any law, rule or regulation
applicable to Holdings.

     3.5. Capitalization.

               (a)  The authorized capital stock of Holdings
     consists of 3,000 shares of Common Stock and 1,000 shares of
     preferred stock, of which 100 shares have been designated
     Series A Convertible Preferred Stock and 20 shares have been
     designated Preferred Stock.  As of the date hereof, 601.5
     shares of Common Stock are outstanding and 120 shares of
     preferred stock (of which 100 shares have been designated
     Series A Convertible Preferred Stock and 20 have been
     designated Preferred Stock) are outstanding.  As of the date
     hereof, 257 shares of Common Stock are reserved for issuance
     upon exercise of outstanding options to purchase shares of
     Common Stock, 100 shares of Common Stock are reserved for
     issuance upon the conversion of the 100 shares of
     outstanding Series A Convertible Preferred Stock and 20
     shares of Common Stock are reserved for issuance upon the
     conversion of the 20 shares of outstanding Preferred Stock.
     Except as set forth on Schedule 3.5 hereto, Holdings does
     not have outstanding any other stock or securities
     convertible or exchangeable for any shares of its capital
     stock or containing any profit participation features, nor
     does it have outstanding any rights, options or warrants to
     subscribe for or to purchase its capital stock or any stock
     or securities convertible into or exchangeable for its
     capital stock or any stock appreciation rights or phantom
     stock plans, nor has it reserved any shares of capital stock
     for issuance upon exercise or conversion of any rights,
     options or warrants to subscribe for or to purchase its
     capital stock or any stock or securities convertible into or
     exchangeable for its capital stock.  Holdings is not a party
     to any agreement which requires Holdings to repurchase or
     otherwise acquire or retire any shares of its capital stock
     or any warrants, options or other rights to acquire its
     capital stock, except as set forth on the Schedule 3.5.
     
               (b)  Except as set forth on Schedule 3.5, there
     are no statutory or contractual stockholders' preemptive
     rights or rights of refusal with respect to the issuance of
     capital stock of Holdings.  Except as set forth on Schedule
     3.5, there are no agreements to which Holdings or any
     holders of the capital stock of Holdings is a party with
     respect to the voting or transfer of the capital stock of
     Holdings.
     
               (c)  All of the outstanding shares of Holdings'
     capital stock are duly authorized, validly issued, fully
     paid and nonassessable with the rights specified in
     Holdings' Certificate of Incorporation, and free of liens or
     restrictions other than as stated herein.
     
     3.6. Consents and Approvals.  Except as set forth on
Schedule 3.6, no consent, approval, order, authorization of, or
declaration, filing, or registration with, any Governmental
Entity is required to be obtained or made by Holdings in
connection with the execution and delivery by Holdings of this
Agreement or the consummation of the transaction contemplated
hereby, other than any such consent, approval, order,
authorization, declaration, filing or registration, the failure
of which to seek or maintain does not individually or in the
aggregate, have a Material Adverse Effect on Holdings.  No
consent or approval of any person other than any Governmental
Entity is required to be obtained or made by Holdings in
connection with the execution and delivery by Holdings of this
Agreement or the consummation of the transaction contemplated
hereby.

     3.7. Subsidiaries.

               (a)  Other than PerImmune, Inc., Holdings does not
     own, directly or indirectly, capital stock or other
     securities of any corporation or partnership or have any
     direct or indirect equity ownership interest in any other
     Person.
     
               (b)  PerImmune, Inc. is a corporation duly
     organized, validly existing, and in good standing under the
     laws of the State of Delaware and has full power and
     authority to conduct its business as currently conducted.
     
               (c)  The authorized capital stock of PerImmune,
     Inc. consists of 100,000 shares of Common Stock. As of the
     date hereof, 1,000 shares of Common Stock are outstanding.
     Except as set forth on Schedule 3.7, PerImmune, Inc. does
     not have outstanding any other stock or securities
     convertible or exchangeable for any shares of its capital
     stock or containing any profit participation features, nor
     does it have outstanding any rights, options or warrants to
     subscribe for or to purchase its capital stock or any stock
     or securities convertible into or exchangeable for its
     capital stock or any stock appreciation rights or phantom
     stock plans, nor has it reserved any shares of capital stock
     for issuance upon exercise or conversion of any rights,
     options or warrants to subscribe for or to purchase its
     capital stock or any stock or securities convertible into or
     exchangeable for its capital stock.  PerImmune, Inc. is not
     a party to any agreement which requires it to repurchase or
     otherwise acquire or retire any shares of its capital stock
     or any warrants, options or other rights to acquire its
     capital stock.
     
     3.8. Private Offering.  No form of general solicitation or
general advertising was used by Holdings or its representatives
in connection with the offer or sale of the Preferred Shares.
Assuming the accuracy of the representations and warranties of
Purchaser in Section 4.5 hereof, no registration of the Preferred
Shares pursuant to the provisions of the Securities Act or any
state securities or "blue sky" laws will be required by the
offer, sale or issuance of the Preferred Shares pursuant to this
Agreement.

     3.9. Liabilities.  Except as set forth on Schedule 3.9,
Holdings has no material liabilities or obligations of any nature
(whether absolute, accrued, contingent or otherwise and whether
matured or unmatured) relating to its business that are of a
nature required to be set forth on a balance sheet in accordance
with GAAP, except (i) liabilities or obligations reflected and
reserved for on the balance sheet dated December 31, 1996, (ii)
liabilities or obligations incurred since December 31, 1996 in
the ordinary course of business, (iii) liabilities which have
been disclosed herein or in the schedules hereto, or (iv)
liabilities arising under or contemplated by this Agreement.

     3.10.     Compliance With Laws.  Except as set forth on
Schedule 3.10, (i) each of Holdings and PerImmune is in
compliance with all Applicable Laws other than violations which
do not, and will not, individually or in the aggregate, have a
Material Adverse Effect on Holdings or PerImmune, as the case may
be; (ii) each of Holdings and PerImmune has obtained and holds
all material permits, licenses, variances, exemptions, orders,
franchises, approvals and authorizations of all Governmental
Entities necessary for the lawful conduct of its business or the
lawful ownership, use and operation of its assets, except when
the failure to do so does not and will not, individually or in
the aggregate, have a Material Adverse Effect on Holdings or
PerImmune, as the case may be; and (iii) neither Holdings nor
PerImmune has received any written notice of violation of any
Applicable Law, which has not been dismissed or otherwise
disposed of, that Holdings or PerImmune (as applicable) has not
so complied other than with respect to violations of Applicable
Law which do not, and will not, individually or in the aggregate,
have a Material Adverse Effect on Holdings or PerImmune, as the
case may be.

     3.11.     Litigation.  Except as set forth on Schedule 3.11,
(i) neither Holdings nor PerImmune nor any of their respective
assets is a party or subject to any filed litigation or
arbitration proceeding; and (ii) neither Holdings nor PerImmune
has received written notice of any governmental investigation or
proceeding involving Holdings, PerImmune or any of their
respective assets, nor to their knowledge is any litigation
threatened.

     3.12.     Tax Matters.  Except as otherwise set forth on
Schedule 3.12,

               (a)  There have been properly completed and filed
     on a timely basis and in correct form all Returns required
     to be filed on or prior to the date hereof, except for any
     Returns, the failure of which to file, would not have a
     Material Adverse Effect on Holdings or PerImmune, as
     applicable.  As of the time of filing, the foregoing Returns
     correctly reflected the facts regarding the income,
     business, assets, operations, activities, status, or other
     matters of Holdings or PerImmune, as applicable, or any
     other information required to be shown thereon.
     
               (b)  With respect to all amounts in respect of
     Taxes imposed on Holdings or PerImmune or for which Holdings
     or PerImmune is or could be liable, whether to taxing
     authorities (as, for example, under law) or to other persons
     or entities (as, for example, under tax allocation
     agreements), with respect to all taxable periods or portions
     of periods ending on or before the date hereof, all
     applicable tax laws and agreements have been fully complied
     with, and all such amounts required to be paid by Holdings
     or PerImmune, as applicable, to taxing authorities or others
     on or before the date hereof have been paid, except for such
     laws and agreements, the failure with which to comply, and
     such amounts the failure of which to pay, would not have a
     Material Adverse Effect on Holdings or PerImmune, as
     applicable.
     
     3.13.     Title to Assets, Etc.  Except for Permitted
Encumbrances, each of Holdings and PerImmune has good and
marketable title to or valid and subsisting leasehold interests
in all assets material to their businesses as currently conducted
and, except as set forth on Schedule 3.13, none of the material
assets is subject to any Encumbrance, except for Encumbrances
which, individually or in the aggregate, are not substantial in
amount and do not materially detract from the value of the
property or assets of Holdings or PerImmune (as applicable) or
interfere with the present use of such property or assets (taken
as a whole) and have not arisen other than in the ordinary course
of business.  Each of Holdings and PerImmune has in all material
respects performed all the obligations required to be performed
by it with respect to all material assets leased by it through
the date hereof, except where the failure to perform would not
have a Material Adverse Effect on Holdings or PerImmune (as
applicable).  All such leases are valid, binding and enforceable
with respect to Holdings or PerImmune (as applicable) in
accordance with their terms and are in full force and effect; no
event of default has occurred which constitutes a default
thereunder on the part of Holdings or PerImmune (as applicable)
and neither Holdings nor PerImmune has knowledge of the
occurrence of any event of default which constitutes a default
thereunder by any other party which defaults are reasonably
likely to have a Material Adverse Effect on it.

     3.14.     Contracts; No Defaults.

               (a)  Schedule 3.14 contains a listing of each
     Material Agreement.  True, correct and complete copies of
     each Material Agreement have been delivered to or made
     available to Purchaser and its agents and representatives.
     
               (b)  Except as set forth on Schedule 3.14, all of
     the Material Agreements of Holdings and PerImmune are (i) in
     full force and effect, (ii) represent the legal, valid and
     binding obligations of Holdings or PerImmune, as applicable,
     and are enforceable against Holdings or PerImmune, as
     applicable, in accordance with their terms and (iii) to the
     best knowledge of Holdings or PerImmune, as applicable,
     represent the legal, valid and binding obligations of the
     other parties thereto and are enforceable against such
     parties in accordance with their terms.  Except as set forth
     on Schedule 3.14, no condition exists or event has occurred
     which, with notice or lapse of time or both, would
     constitute a material default or a basis for force majeure
     or the claim of excusable delay or nonperformance under such
     Material Agreements.
     
     3.15.     Intellectual Property.

               (a)  Each of Holdings and PerImmune either owns or
     has valid licenses or other rights to use all patents,
     copyrights, trademarks, software, databases, data, other
     technical information used in their businesses as presently
     conducted ("Proprietary Rights"), subject to the limitations
     contained in the agreements governing the use of the same,
     with such exceptions as would not result in a Material
     Adverse Effect on Holdings. There are no limitations
     contained in the agreements of the type described in the
     immediately preceding sentence which, upon consummation of
     the transaction contemplated hereunder, will alter or impair
     any such rights, breach any such agreement with any third
     party vendor, or require payments of additional sums
     thereunder, except any such limitations that would not have
     a Material Adverse Effect on Holdings or PerImmune, as
     applicable.  Each of Holdings and PerImmune is in compliance
     in all material respects with such licenses and agreements
     and, except as set forth on Schedule 3.15, there are no
     pending or, to the best knowledge of Holdings, threatened
     proceedings challenging or questioning the validity or
     effectiveness of any license or agreement relating to such
     property or the right of Holdings or PerImmune to use, copy,
     modify or distribute the same.
     
               (b)  No person has a right, other than those set
     forth on Schedule 3.15 to receive a royalty or similar
     payment in respect of any material Proprietary Rights
     whether or not pursuant to any contractual arrangements
     entered into by Holdings or PerImmune.
     
IV.
REPRESENTATIONS AND WARRANTIES OF PURCHASER

          Purchaser makes the following representations and
warranties to Holdings:

     4.1. Organization.  Purchaser is a corporation duly
organized, validly existing, and in good standing under the laws
of the State of Minnesota, and has full power and authority to
conduct its business as currently conducted and to enter into and
perform this Agreement.

     4.2. Authorization.  The execution, delivery and performance
of this Agreement by Purchaser have been duly authorized by all
necessary corporate action on the part of Purchaser.  This
Agreement has been duly executed by Purchaser and delivered to
Holdings and constitutes the legal, valid and binding obligation
of Purchaser, enforceable in accordance with its terms except as
its enforceability may be limited by bankruptcy, insolvency or
other laws affecting creditors' rights generally and the exercise
of judicial discretion in accordance with general equitable
principles.

     4.3. No Breach.  None of (i) the execution, delivery and
performance of this Agreement by Purchaser, (ii) the consummation
of this Agreement and all other documents or instruments related
thereto or executed in connection therewith or in contemplation
of the transaction hereunder, or (iii) Purchaser's compliance
with the terms and conditions hereof will, with or without the
giving of notice or the lapse of time or both, conflict with,
breach the terms and conditions of, constitute a default under,
or violate Purchaser's charter or Bylaws, or any judgment,
decree, order or material agreement to which Purchaser is a party
or by which Purchaser is legally bound, or any law, rule or
regulation applicable to Purchaser.

     4.4. Consents and Appeals.  Except as set forth on Schedule
4.4, no consent, approval, order or authorization of, or
declaration, filing or registration with, any Government Entity
is required to be obtained or made by Purchaser in connection
with the execution and delivery by Purchaser of this Agreement or
the consummation of the transaction contemplated hereby.  No
consent or approval of any person other than any Governmental
Entity is required to be obtained or made by Purchaser in
connection with the execution and delivery by Purchaser of this
Agreement or the consummation of the transaction contemplated
hereby.

     4.5. Sophistication, Purchase for Own Account.

               (a)  Sophistication, etc.  Purchaser is
     knowledgeable, sophisticated and experienced in business and
     financial matters; is able to bear the economic risks of its
     investment in the Preferred Shares and is presently able to
     afford the complete loss of such investment; and has been
     afforded access to information about Holdings and its
     financial condition, results of operations, business,
     property, management and prospects sufficient to enable it
     to evaluate its investment in Holdings.  Purchaser
     represents that it is an "accredited investor" as such term
     is defined in Rule 501(a) of Regulation D under the
     Securities Act of 1933, as amended (the "Securities Act").
     
               (b)  Purchase for Own Account.  The Preferred
     Shares, and the shares of Common Stock to be issued upon
     conversion of the Preferred Shares, are being or will be
     acquired by Purchaser (as applicable) for its own account
     and with no intention of distributing or reselling such
     securities or any part thereof in any transaction that would
     be in violation of the Securities Act or the securities laws
     of any state, without prejudice, however, to the rights of
     Purchaser at all times to sell or otherwise dispose of all
     or any part of the Preferred Shares or the shares of Common
     Stock issuable upon conversion of the Preferred Shares under
     an effective registration statement under the Securities Act
     or pursuant to an exemption from such registration available
     under the Securities Act, and subject, nevertheless, to the
     disposition of such Purchaser's property being at all times
     within its control.  If Purchaser should in the future
     decide to dispose of any of the Preferred Shares or the
     shares of Common Stock issuable upon conversion of the
     Preferred Shares, Purchaser understands and agrees that it
     may do so only in compliance with the Securities Act and
     applicable state securities laws, as then in effect.  Such
     Purchaser agrees to the imprinting, so long as required by
     law, of a legend on certificates representing all of the
     Preferred Shares or the shares of Common Stock to be issued
     upon conversion of the Preferred Shares to the following
     effect:
     
     "THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE
     NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
     AS AMENDED, OR THE SECURITIES LAWS OF ANY STATE AND MAY
     NOT BE SOLD OR OTHERWISE DISPOSED OF EXCEPT PURSUANT TO
     AN EFFECTIVE REGISTRATION STATEMENT UNDER SUCH ACT AND
     APPLICABLE STATE SECURITIES LAWS OR PURSUANT TO AN
     APPLICABLE EXEMPTION TO THE REGISTRATION REQUIREMENTS
     OF SUCH ACT OR SUCH LAWS.
     
V.
CLOSING

     5.1. Closing Date.  The consummation of the purchase of the
Preferred Shares contemplated hereby (the "Closing") shall take
place within thirty days of the date hereof (the "Closing Date").
The Closing shall take place at the offices of PerImmune
Holdings, Inc. at 1330 Piccard Drive, Rockville, Maryland, and
shall be effective as of 12:01 a.m. on the Closing Date.

     5.2. Performance at Closing.  The following deliveries shall
be made at Closing:

          5.2.1.    By Purchaser.  Purchaser shall deliver to
Holdings:

               (a)  To an account designated by Holdings, the
     Purchase Price by wire transfer of immediately available
     funds; and
     
               (b)  Such other documents as may be reasonably
     requested by Holdings' counsel.
     
          5.2.2.    By Holdings.  Holdings shall deliver to
Purchaser:

               (a)  A certificate evidencing the Preferred
     Shares, which shall be registered in Purchaser's name; and
     
               (b)  Such other documents as may be reasonably
     requested by Purchaser's counsel.
     
     5.3. Other Documents and Acts.

               (a)  The parties will execute such other documents
     and perform such other acts, after the Closing Date, as may
     be necessary for the complete implementation and
     consummation of this Agreement.
     
               (b)  At Closing, Holdings and the Purchaser will
     execute and deliver the Amended and Restated Registration
     Rights Agreement.
     
     5.4. Certificates; Opinions.  At Closing, the Purchaser and
Holdings will deliver the certificates and opinion of counsel
specified in Sections 6.1(c) and 6.2(c)-(d), respectively, in
form and substance reasonably satisfactory to the parties'
respective counsel.

VI.
CONDITIONS TO CLOSING

     6.1. Conditions to Holdings' Obligations.  The obligations
of Holdings to consummate the transaction contemplated hereby on
the Closing Date is subject to the satisfaction or waiver on or
prior to the Closing Date, of each of the following conditions:

               (a)  Consents.  All Permits and waivers from
     Governmental Entities and all consents, approvals, permits
     and waivers from other parties necessary to permit Purchaser
     and Holdings to consummate the transaction contemplated
     hereby, shall have been obtained, unless the failure to
     obtain any such Permit or waiver from a Governmental Entity
     or any other consent, approval, permit or waiver would not
     have a Material Adverse Effect upon Holdings.
     
               (b)  No Governmental or Other Proceedings or
     Litigation.  There shall be no injunction or court order
     restraining consummation of the transaction contemplated
     hereunder and there shall be no pending or threatened action
     or proceeding by or before a court or governmental body
     brought by or on behalf of any Governmental Entity seeking
     to restrain or invalidate all or any portion of the
     transactions contemplated hereunder, and there shall not
     have been adopted any law or regulation making all or any
     portion of the transaction contemplated hereunder illegal.
     
               (c)  Certificates.  Purchaser will furnish
     Holdings with such certificates, in form and substance
     satisfactory to Holdings, of the Chief Executive Officer and
     the Secretary of Purchaser and others to evidence compliance
     with the conditions set forth in this Article 6.
     
     6.2. Conditions to Purchaser's Obligations.  The obligation
of Purchaser to consummate the transaction contemplated hereby on
the Closing Date is subject to the satisfaction or waiver on or
prior to the Closing Date of each of the following conditions:

               (a)  Consents.  All Permits and waivers from
     Governmental Entities and all consents, approvals, permits
     and waivers from other parties necessary to permit Purchaser
     and Holdings to consummate the transaction contemplated
     hereby, shall have been obtained, unless the failure to
     obtain any such Permit or waiver from a Governmental Entity
     or any other consent, approval, permit or waiver would not
     have a Material Adverse Effect upon Holdings or Purchaser.
     
               (b)  No Governmental or Other Proceedings or
     Litigation.  There shall be no injunction or court order
     restraining consummation of the transaction contemplated
     hereunder and there shall be no pending or threatened action
     or proceeding by or before a court or governmental body
     brought by or on behalf of any Governmental Entity seeking
     to restrain or invalidate all or any portion of the
     transactions contemplated hereunder, and there shall not
     have been adopted any law or regulation making all or any
     portion of the transaction contemplated hereunder illegal.
     
               (c)  Opinion of Counsel.  Holdings shall have
     delivered to Purchaser the opinion of Latham & Watkins,
     counsel to Holdings, with respect to the matters set forth
     on Exhibit C hereto.
     
               (d)  Certificates.  Holdings shall furnish
     Purchaser with such certificates, in form and substance
     satisfactory to Purchaser, of the Chief Executive Officer
     and the Secretary of Holdings and others to evidence
     compliance with the conditions set forth in this Article 6.
     
               (e)  Certificate of Designations.  Holdings shall
     have adopted the Certificate of Amendment, the Certificate
     of Amendment shall have been appropriately filed with the
     office of the Secretary of State of the State of Delaware
     and shall have become effective under the Delaware General
     Corporation Law.  Holdings shall have provided the Purchaser
     with evidence of such adoption and filing.
     
VII.
ADDITIONAL AGREEMENTS OF PURCHASER AND HOLDINGS

     7.1. Prohibition on Sale; Right of First Offer.

               (a)  Purchaser hereby covenants and agrees that it
     will not sell, transfer, convey, assign, pledge, hypothecate
     or otherwise dispose of the Preferred Shares (or any
     interest therein) without the prior written consent of
     Holdings (which consent will not be unreasonably withheld).
     
               (b)  Notwithstanding Section 7.1(a) above, in the
     event that a Qualifying IPO (as defined in the Certificate
     of Designations), does not occur within nine months after
     the date hereof, Purchaser may at any time thereafter offer
     to sell or otherwise dispose of all or any portion of the
     Preferred Shares to any Person other than Holdings in
     accordance with the provisions below.  If Purchaser finds a
     buyer ("Buyer") for the Preferred Shares, Purchaser shall
     notify Holdings of its intent to sell or otherwise dispose
     of the Preferred Shares to Buyer.  Purchaser shall set forth
     in the notice to Holdings the name of Buyer and the terms
     and conditions of the proposed sale or other disposition,
     and Holdings shall thereafter have fifteen days after
     delivery of such notice to notify Purchaser whether or not
     it will purchase the Preferred Shares on the same terms and
     conditions set forth in the notice.  If Holdings accepts the
     offer, then Holdings shall purchase the Preferred Shares
     under the same terms and conditions offered to Buyer, except
     that Holdings must make the payment for the Preferred Shares
     within thirty days after accepting the offer to purchase the
     Preferred Shares.  If Holdings declines to accept the offer
     or if it accepts the offer but fails to purchase the
     Preferred Shares within the requisite time frame, then
     Purchaser may sell the Preferred Shares to Buyer or any
     other buyer at any time thereafter so long as the terms and
     conditions of such sale or other disposition are no more
     favorable to Buyer or other buyer as set forth in the notice
     to Holdings.  In the event that the proposed purchase price
     to Buyer or other buyer is later adjusted to a price lower
     than the price originally set forth in the written notice to
     Holdings, Purchaser must provide a second written notice to
     Holdings setting forth the lower price and giving Holdings
     another opportunity to purchase the Offered Shares for the
     lower price; if Holdings accepts the new offer to purchase
     the Preferred Shares at the lower price it must pay the
     purchase price within ten days after receipt of the second
     notice from Purchaser.
     
     7.2. Lock-Up Agreement; Sale After Lock-Up Period.

               (a)  Purchase hereby covenants and agrees that it
     will sign any reasonable "lock-up" letter with terms and
     conditions substantially the same as any lock-up letter that
     certain officers, directors or other significant
     stockholders are requested to sign restricting Purchaser's
     ability to sell, transfer, convey, assign, pledge,
     hypothecate, or otherwise dispose of securities of Holdings
     for a period of up to 180 days after a Qualifying IPO (the
     "Lock-Up Period"), as may be requested by underwriters in
     connection with such Qualifying IPO.
     
               (b)  After the Lock-Up Period, if any, Purchaser
     may sell or otherwise dispose of Common Stock of Holdings at
     any time without restriction (other than under applicable
     law) so long as:  (i) the net proceeds of any such sale or
     sales do not exceed the Purchase Price, (ii) Purchaser
     provides ten days' prior written notice to Holdings prior to
     any such sale, and (iii) Holdings is given the opportunity
     to purchase the subject securities from Purchaser at the
     prevailing market price during such ten-day period.
     
               (c)  After the Lock-Up Period and so long as the
     Research, Collaboration and Distribution Agreement, dated
     December __, 1997 (the "Research Agreement"), between
     Holdings and Purchaser remains in effect, Purchaser may also
     sell or otherwise dispose of additional securities of
     Holdings (beyond the number of shares allowed under Section
     7.2(b)) at the prevailing market price so long as:  (i)
     Purchaser provides Holdings with three business days' prior
     notice each time it intends to sell any additional
     securities, (ii) Holdings is given the opportunity to
     purchase such additional securities during said three
     business day period, and (iii) following any such sale,
     Purchaser continues to hold at least fifty percent (50%) of
     the shares of Common Stock initially held by Purchaser upon
     conversion of the Preferred Stock in connection with the
     Qualifying IPO.  Upon termination or expiration of the
     Research Agreement or in the event that Holdings is in
     material default thereunder and the default is not cured
     within 30 days of receipt of notice from Purchaser by
     Holdings of such default, Purchaser may at any time sell any
     additional securities of Holdings in its possession without
     the restrictions set forth above.
     
               (d)  For the purpose of this Section 7.2, the term
     "market price" shall mean (i) the average of the closing
     price of a share of common stock on the principal exchange
     on which shares of common stock are then trading, if any,
     during such ten-day period, or (ii) if such common stock is
     not traded on an exchange but is quoted on Nasdaq or a
     successor quotation system, (1) the average, during such ten
     day period, of the last sales price (if the common stock is
     then listed as a National Market Issue under the Nasdaq
     National Market System) or (2) the average of the mean
     between the closing representative bid and asked prices for
     each day during such ten-day period (in all other cases) for
     common stock as reported by Nasdaq or such successor
     quotation system, or (iii) if the common stock is not
     publicly traded on an exchange and not quoted on Nasdaq or a
     successor quotation system, the average of the mean between
     the closing bid and asked prices for the common stock for
     each day during the ten day period.
     
     7.3. Reservation of Shares.  Until all Preferred Shares are
no longer outstanding due to conversion or otherwise, Holdings
shall at all times reserve and keep available out of its
authorized Common Stock, solely for the purpose of issue or
delivery upon conversion of the Preferred Shares as provided in
the Certificate of Designations, the maximum number of shares of
Common Stock that may be issuable or deliverable upon such
conversion.  Such shares of Common Stock shall, when issued or
delivered in accordance with the provisions of the Certificate of
Designations, be duly authorized, validly issued and fully paid
and non-assessable.  Holdings shall issue such Common Stock in
accordance with the provisions of the Certificate of Designations
and shall otherwise comply with the terms thereof.

     7.4. Registration Rights Agreement.  On the Closing Date,
Holdings and Purchaser shall enter into the Amended and Restated
Registration Rights Agreement.

VIII.
INDEMNIFICATION

     8.1. Survival of Representations, Etc.  The representations,
warranties, covenants and agreements of the parties hereto
contained herein, shall survive the Closing, but, other than
those contained in Section 3.1, 3.3, 3.5 and 7.1 through 7.4,
shall terminate on the date twelve months from the Closing Date;
provided, however, that there shall be no such termination with
respect to any representation or warranty as to which a bona fide
claim has been asserted prior to such date.

     8.2. Indemnification by Holdings.  Holdings shall indemnify
and hold harmless Purchaser and its Affiliates, directors,
officers, advisors, agents and employees (the "Purchaser
Indemnified Parties") to the fullest extent lawful, from and
against any and all demands, losses, damages, penalties, claims,
liabilities, obligations, actions, causes of action, and
reasonable expenses (including without limitation, costs of
investigating, preparing or defending any such claim or action
and reasonable legal fees and expenses) (collectively, "Losses"),
arising by reason of or resulting from any breach of any
warranty, representation, covenant or agreement of Holdings
contained in this Agreement or in any certificate delivered
pursuant thereto; provided, however, that no Purchaser
Indemnified Party shall be entitled to indemnification by
Holdings hereunder with respect to any Losses arising solely from
the bad faith or gross negligence (as finally determined by a
court of competent jurisdiction) of such Purchaser Indemnified
Party or any Affiliate, director, officer, agent, or employee of
such Purchaser Indemnified Party.

     8.3. Indemnification by Purchaser.  Purchaser shall
indemnify and hold harmless Holdings and its Affiliates,
directors, officers, advisors, agents and employees (the
"Holdings Indemnified Parties") to the fullest extent lawful,
from and against any and all Losses arising by reason of or
resulting from any breach of any warranty, representation,
covenant or agreement of such Purchaser contained in this
Agreement or in any certificate delivered pursuant thereto,
provided, however, that no Holdings Indemnified Party shall be
entitled to indemnification by Purchaser hereunder with respect
to any Losses arising solely from the bad faith or gross
negligence (as finally determined by a court of competent
jurisdiction) of such Holdings Indemnified Party, or any
Affiliate, director, officer, agent or employee of such Holdings
Indemnified Party.

     8.4. Losses.  The term "Losses" as used in this Section 8 is
not limited to matters asserted by third parties, but includes
Losses incurred or sustained by an Indemnified Party in the
absence of third party claims.  Payments by an Indemnified Party
of amounts for which such Indemnified Party is indemnified
hereunder shall not necessarily be a condition precedent to
recovery.

     8.5. Defense of Claims.  If a claim for Losses (a "Claim")
is to be made by an Indemnified Party, such Indemnified Party
shall give written notice (a "Claim Notice") to the indemnifying
party as soon as practicable after such Indemnified Party becomes
aware of any fact, condition or event which may give rise to
Losses for which indemnification may be sought under this Section
8.  If any lawsuit or enforcement action is filed against any
Indemnified Party hereunder, notice thereof (a "Third Party
Notice") shall be given to the indemnifying party as promptly as
practicable (and in any event within fifteen (15) calendar days
after the service of the citation or summons).  The failure of
any Indemnified Party to give timely notice hereunder shall not
affect rights to indemnification hereunder, except to the extent
that the indemnifying party demonstrates actual damage caused by
such failure.  After receipt of a Third Party Notice, if the
indemnifying party shall acknowledge in writing to the
Indemnified Party that the indemnifying party shall be obligated
under the terms of its indemnity hereunder in connection with
such lawsuit or action, then the indemnifying party shall be
entitled, if it so elects, (i) to take control of the defense and
investigation of such lawsuit or action, (ii) to employ and
engage attorneys of its own choice to handle and defend the same,
at the indemnifying party's cost, risk and expense unless the
named parties to such action or proceeding include both the
indemnifying party and the Indemnified Party and the Indemnified
Party has been advised in writing by counsel that there may be
one or more legal defenses available to such Indemnified Party
that are different from or additional to those available to the
indemnifying party, and (iii) to compromise or settle such claim,
which compromise or settlement shall be made only with the
written consent of the Indemnified Party, such consent not to be
unreasonably withheld.  The Indemnified Party shall cooperate in
all reasonable respects with the indemnifying party and such
attorneys in the investigation, trial and defense of such lawsuit
or action and any appeal arising therefrom; and the Indemnified
Party may, at its own cost, participate in the investigation,
trial and defense of such lawsuit or action and any appeal
arising therefrom and appoint its own counsel therefor, at its
own cost.  The parties shall also cooperate with each other in
any notifications to insurers.  If the indemnifying party fails
to assume the defense of such claim within fifteen (15) calendar
days after receipt of the Third Party Notice, the Indemnified
Party against which such claim has been asserted will (upon
delivering notice to such effect to the indemnifying party) have
the right to undertake the defense, compromise or settlement of
such claim and the indemnifying party shall have the right to
participate therein at its own cost; provided, however, that such
claim shall not be compromised or settled without the written
consent of the indemnifying party, which consent shall not be
unreasonably withheld.  In the event the Indemnified Party
assumes the defense of the claim the Indemnified Party will keep
the indemnifying party reasonably informed of the progress of any
such defense, compromise or settlement.  Notwithstanding the
foregoing, the indemnifying party shall not be liable for the
reasonable fees and expenses of more than one separate firm of
attorneys at any time for any and all Indemnified Parties (which
firm shall be designated in writing by such Indemnified Party or
Parties) in connection with any one such action or proceeding
arising out of the same general allegations or circumstances.

     8.6. Tax Treatment of Indemnity.  The parties agree that any
indemnification payments made pursuant to this Agreement shall be
treated for Tax purposes as an adjustment to the consideration
for the purchase of the Preferred Shares, unless otherwise
required by applicable law, in which event indemnification
payments shall be made in an amount sufficient to indemnify the
party on a net after-Tax basis.

IX.
GENERAL PROVISIONS

     9.1. Expenses.  Except as otherwise provided herein, all
expenses involved in the preparation and consummation of this
Agreement shall be borne by the party incurring the same whether
or not the transaction contemplated hereby is consummated.

     9.2. Notices.  All notices, requests, demands, and other
communications pertaining to this Agreement shall be in writing
and shall be deemed duly given when delivered personally (which
shall include delivery by Federal Express or other nationally
recognized, reputable overnight courier service that issues a
receipt or other confirmation of delivery) to the party for whom
such communication is intended, or three (3) business days after
the date mailed by certified or registered U.S. mail, return
receipt requested, postage prepaid, addressed as follows:

          (a)  If to Purchaser:

               Mentor Corporation
               5425 Hollister Avenue
               Santa Barbara, CA  93111
               Attn:  General Counsel

          (b)  If to Holdings:
          
               PerImmune, Inc.
               1330 Piccard Drive
               Rockville, MD 20850-4396
               Attn:  Michael G. Hanna, Jr., Ph.D.
          
          with a copy to:
          
               Latham & Watkins
               1001 Pennsylvania Avenue, N.W.
               Suite 1300
               Washington, D.C.  20004
               Attn:  Bruce E. Rosenblum
               
Any party may change its address for notices by notice to the
other given pursuant to this Section 9.

     9.3. Brokers.  Each party represents and warrants to the
other that no agent, broker, investment banker, or other person
or firm acting on behalf of such party or any of its affiliates
or under the authority of any of them is or will be entitled to
any broker's or finder's fee or any other commission or similar
fee in connection with the transaction contemplated hereby, other
than Vector Securities, whose fees will be solely the
responsibility of Holdings.

     9.4. Waiver.  Unless otherwise specifically agreed in
writing to the contrary:  (i) the failure of either party at any
time to require performance by the other of any provision of this
Agreement shall not affect such party's right thereafter to
enforce the same; (ii) no waiver by either party of any default
by any other shall be valid unless in writing and acknowledged by
an authorized representative of the non-defaulting party, and no
such waiver shall be taken or held to be a waiver by such party
of any other preceding or subsequent default; and (iii) no
extension of time granted by either party for the performance of
any obligation or act by any other party shall be deemed to be an
extension of time for the performance of any other obligation or
act hereunder.

     9.5. Entire Agreement.  This Agreement, the exhibits and
schedules hereto (which are incorporated by reference herein)
constitute the entire agreement between the parties with respect
to the subject matter hereof and referenced herein, supersede and
terminate any prior agreements between the parties (written or
oral).  This Agreement may not be altered or amended except by an
instrument in writing signed by the party against whom
enforcement of any such change is sought.

     9.6. Counterparts.  This Agreement may be signed in any
number of counterparts with the same effect as if the signatures
on each such counterpart were on the same instrument.

     9.7. Construction.  The Section headings of this Agreement
are for convenience only and in no way modify, interpret or
construe the meaning of specific provisions of the Agreement.

     9.8. Severability.  If any one or more of the provisions
contained in this Agreement should be found invalid, illegal or
unenforceable in any respect, the validity, legality, and
enforceability of the remaining provisions contained herein shall
not in any way be affected or impaired thereby.  Any illegal or
unenforceable term shall be deemed to be void and of no force and
effect only to the minimum extent necessary to bring such term
within the provisions of applicable law and such term, as so
modified, and the remaining provisions of this Agreement shall
then be fully enforceable.

     9.9. Choice of Law.  This Agreement shall be governed by and
construed in accordance with the laws of the State of Maryland
without regard to the choice of law rules utilized in that
jurisdiction.

          IN WITNESS WHEREOF, each of the parties has caused this
Agreement to be executed by a respective duly authorized officer
as of the date first written above.


                         PERIMMUNE HOLDINGS, INC.

                         By:  /s/MICHAEL G. HANNA
                              Name:  Michael G. Hanna
                              Title:  President



                         MENTOR CORPORATION

                         By:  /s/CHRISTOPHER CONWAY
                              Name:  Christopher Conway
                              Title:  Chairman, CEO
                         


SCHEDULES AND EXHIBITS


     The Registrant will make the following schedules and
exhibits available upon request:


          Schedule 3.3                  Pre-emptive Rights

          Schedule 3.5                  Capitalization

          Schedule 3.6                  Consent and Approvals

          Schedule 3.7                  Subsidiaries

          Schedule 3.9                  Liabilities

          Schedule 3.10                 Non-compliance with Laws

          Schedule 3.11                 Litigation

          Schedule 3.12                 Tax Matters

          Schedule 3.13                 Title to Assets

          Schedule 3.14                 Contracts

          Schedule 3.15                 Intellectual Property

          Exhibit A                Form of Certificate of
                                   Designations, Preferences and
                                   Relative, Participating
                                   Optional and other Special
                                   Rights and Qualifications,
                                   Limitations and Restrictions
                                   Thereof of Series B
                                   Convertible Preferred Stock of
                                   Perimmune Holdings, Inc.

          Exhibit B                Form of Amended and Restated
                                   Registration Rights Agreement
          



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