IGEN INC /CA/
10-Q, 1997-02-14
PATENT OWNERS & LESSORS
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                             Washington, DC  20549

                                   FORM 10-Q

QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES ACT OF 1934

                     For Quarter Ended  December 31, 1996
                                        -----------------
                                        
                    Commission File Number         0-23252
                                                ------------
                                        
                           IGEN INTERNATIONAL, INC.
       -----------------------------------------------------------------
             (Exact name of registrant as specified in its charter)


            DELAWARE                                        94-2852543
       --------------------------------------------------------------------  
       (State or other jurisdiction of                    (IRS Employer
         incorporation or organization)                   Identification No.)


               16020 INDUSTRIAL DRIVE, GAITHERSBURG, MD      20877
       ----------------------------------------------------------------------
          (Address of principal executive offices)         (Zip Code)
                                                       

                                (301) 984-8000
       -----------------------------------------------------------------------
              (Registrant's telephone number, including area code)
       

Indicate by check mark whether the Registrant (1) has filed all reports required
to be filed by Section 13 or 15 (d) of the Securities 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     X                         No _____
                       -----                                   

Indicate the number of shares outstanding of each of the issuer's classes of
common stock, as of the latest practicable date.


               Class                          Outstanding at February 6, 1997
               -----                          -------------------------------

       Common Stock, $0.001 par value                   14,982,835
<PAGE>
 
                           IGEN INTERNATIONAL, INC.
                                   FORM 10-Q
                    FOR THE QUARTER ENDED DECEMBER 31, 1996

                                     INDEX

<TABLE>
<CAPTION>
                                                                                      PAGE
                                                                                      -----        
PART I    FINANCIAL INFORMATION
- -------------------------------
<S>                                                                                   <C> 
Item 1.   Financial Statements
 
          Balance Sheets - December 31, 1996, and March 31, 1996                          3
 
          Statements of Operations - For the three and nine months ended
          December 31, 1996 and 1995                                                      4
 
          Statements of Cash Flows - For the nine months ended
          December 31, 1996 and 1995                                                      5
 
          Notes to Financial Statements                                                   6
 
Item 2.   Management's Discussion and Analysis of Financial
          Condition and Results of Operations                                             8


PART II   OTHER INFORMATION
- ---------------------------
Item 2.   Changes in Securities                                                          10

Item 6.   Exhibits and Reports on Form 8-K                                               13

SIGNATURES                                                                               
</TABLE> 

                                       2
<PAGE>

PART I  FINANCIAL INFORMATION
- -----------------------------

Item 1. Financial Statements
 
                           IGEN INTERNATIONAL, INC.
                                BALANCE SHEETS
                                (IN THOUSANDS)

<TABLE>
<CAPTION>
                                                    DECEMBER 31,    MARCH 31,
                                                        1996          1996
                                                    -------------  ----------
ASSETS                                              (UNAUDITED)
- ------                                                              
<S>                                                 <C>            <C>
CURRENT ASSETS:
Cash and cash equivalents                               $    990    $  4,001
Short-term investments                                     7,088      16,216
Accounts receivable                                        1,602       1,892
Notes receivable - capital leases                            469
Inventory                                                  1,917       1,648
Prepaid expenses                                             681       1,035
Other current assets                                         124         420
                                                        --------    --------
   Total current assets                                   12,871      25,212
                                                        --------    --------
 
EQUIPMENT, FURNITURE, AND IMPROVEMENTS                     6,727       6,172
Accumulated depreciation and amortization                ( 3,486)    ( 2,590)
                                                        --------    --------
   Equipment, furniture, and improvements, net             3,241       3,582
                                                        --------    --------
 
OTHER ASSETS                                                 448         482
                                                        --------    --------
 
TOTAL                                                   $ 16,560    $ 29,276
                                                        ========    ========

LIABILITIES AND STOCKHOLDERS' EQUITY
- ------------------------------------

CURRENT LIABILITIES:
Accounts payable and accrued expenses                   $  3,940    $  3,793
Deferred revenue                                              96       7,532
Obligations under capital leases                             166         187
                                                        --------    --------
       Total current liabilities                           4,202      11,512
 
NONCURRENT LIABILITIES:
Obligations under capital leases                             121         329   
                                                        --------    --------   
      Total Liabilities                                    4,323      11,841
                                                        --------    --------
STOCKHOLDERS' EQUITY:
Common stock: $.001 par value, 50,000,000 shares
  authorized; 14,973,210 and 14,908,530
  shares issued and outstanding                               15          15
Additional paid-in capital                                64,839      64,676
Accumulated deficit                                      (52,289)    (46,818)
Deferred compensation                                         (9)        (91)
Notes receivable from sale of common stock                  (319)       (347)
                                                        --------    --------
   Total stockholders' equity                             12,237      17,435
                                                        --------    --------
 
TOTAL                                                   $ 16,560    $ 29,276
                                                        ========    ========
 </TABLE>

                      See notes to financial statements.

                                       3
<PAGE>
 
                           IGEN INTERNATIONAL, INC.
                           STATEMENTS OF OPERATIONS
               (UNAUDITED, IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                               THREE MONTHS ENDED              NINE MONTHS ENDED
                                                  DECEMBER 31,                    DECEMBER 31,
                                             1996         1995                1996        1995
                                           --------     --------            --------    -------- 
<S>                                        <C>          <C>               <C>            <C>
REVENUES:
    License and royalty income                $ 2,395    $  2,367          $ 7,147        $  7,102
    Product sales                               1,698       1,077            5,031           2,995
    Contract revenue                              427         509            1,673           1,455
                                              -------    --------          -------        --------
                                                4,520       3,953           13,851          11,552
                                              -------    --------          -------        --------
OPERATING COSTS AND EXPENSES:
    Product costs                                 731         457            1,969           1,345
    Research and development                    3,399       3,644           10,033          10,407
    Marketing, general and administrative       2,888       1,917            7,991           6,241
                                              -------    --------          -------        --------
                                                7,018       6,018           19,993          17,993
                                              -------    --------          -------        --------
LOSS FROM OPERATIONS                           (2,498)     (2,065)          (6,142)         (6,441)
INTEREST INCOME - net                             261         227              671             814
                                              -------    --------          -------        --------
NET LOSS                                      $(2,237)   $( 1,838)         $(5,471)       $( 5,627)
                                              =======    ========          =======        ========
NET LOSS PER SHARE                            $  (.15)   $   (.12)         $  (.37)       $   (.38)
                                              =======    ========          =======        ========
SHARES USED IN COMPUTING
    NET LOSS PER  SHARE                        14,969      14,771           14,955          14,742
                                              =======    ========          =======        ========
</TABLE>



                      See notes to financial statements.

                                       4
<PAGE>
 
                           IGEN INTERNATIONAL, INC.
                           STATEMENTS OF CASH FLOWS
                           (UNAUDITED, IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                                   NINE MONTHS ENDED
                                                                                      DECEMBER 31,
                                                                             1996                   1995
                                                                           --------               -------- 
<S>                                                                        <C>                    <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
     Net loss                                                              $ (5,471)              $  (5,627)
     Adjustments to reconcile net income to net cash used in operating
     activities:
          Interest on notes receivable from sale of common stock                 (5)                    (22)
          Amortization of deferred compensation                                  82                      81
          Depreciation and amortization                                         896                     802
          Deferred revenue                                                   (7,436)                 (5,148)
          Decrease (increase) in accounts receivable                            290                    (113)
          Increase in notes receivable-capital leases                          (469)
          Increase in inventory                                                (269)                   (688)
          Decrease (increase) in prepaid expenses                               354                    (497)
          Decrease (increase) in other current assets                           296                    (414)
          Decrease in  other assets                                              34                     259
          Increase (decrease) in accounts payable and accrued expenses          147                  (1,454)
                                                                           --------               ---------

                   Net cash used in operating activities                    (11,551)                (12,821)
                                                                           --------               ---------

CASH FLOWS FROM INVESTING ACTIVITIES:
   Expenditures for equipment, furniture and improvements                      (555)                   (975)
   Sale (purchase) of short-term investments                                  9,128                 (11,816)
                                                                           --------               ---------

                   Net cash provided by (used in) investing activities        8,573                 (12,791)
                                                                           --------               ---------

CASH FLOWS FROM FINANCING ACTIVITIES:
   Repayment  of notes receivable from sale of
        common stock, net                                                        33                      69
   Issuance (purchase) of common stock - net                                    163                    (326)
   Principal payments under capital lease obligations                          (229)                   (172)
                                                                           --------               ---------

                   Net cash used in financing activities                        (33)                  ( 429)
                                                                           --------               ---------

NET DECREASE IN CASH AND CASH EQUIVALENTS                                    (3,011)                (26,041)

CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD                                4,001                  30,226
                                                                           --------               ---------

CASH AND CASH EQUIVALENTS, END OF PERIOD                                   $    990               $   4,185
                                                                           ========               =========
</TABLE>

                      See notes to financial statements.

                                       5
<PAGE>
 
                           IGEN INTERNATIONAL, INC.
                                   FORM 10-Q
                    FOR THE QUARTER ENDED DECEMBER 31, 1996

NOTES TO FINANCIAL STATEMENTS (Unaudited)

1.   Basis of Presentation and Accounting Policies

On November 19, 1996,  IGEN, Inc. was merged into a newly formed Delaware
corporation, IGEN International, Inc. (the "Company"). The change in the state
of incorporation and name had previously been approved by shareholders at the
IGEN Annual Meeting of Shareholders on September 10, 1996. These changes do not
affect IGEN's business operations, employees, shareholders or its business
locations.

The financial statements of IGEN International, Inc. reflect, in the opinion of
management, all adjustments, consisting only of normal and recurring
adjustments, necessary to present fairly the Company's financial position at
December 31, 1996 and the Company's results of operations for the three and nine
month periods ended December 31, 1996 and 1995, respectively.  Interim period
results are unaudited and are not necessarily indicative of results of
operations or cash flows for a full year period.  The balance sheet at March 31,
1996 was derived from audited financial statements at such date.

Pursuant to accounting requirements of the Securities and Exchange Commission
applicable to quarterly reports on Form 10-Q, the accompanying financial
statements and these notes do not include all disclosures required by generally
accepted accounting principles for complete financial statements.  Accordingly,
these statements should be read in conjunction with the Company's most recent
annual financial statements included in the Company's Annual Report for the
fiscal year ended March 31, 1996.

2.   Summary of Significant Accounting Policies

Cash Equivalents and Short-Term Investments - Cash equivalents include cash in
banks, money market funds, securities of the U.S. Treasury and certificates of
deposit with original maturities of three months or less.

Concentration of Credit Risks - The Company has invested its excess cash
generally in securities of the U.S. Treasury, money market funds, certificates
of deposit and corporate bonds.  The Company invests its excess cash in
accordance with a policy objective that seeks to ensure both liquidity and
safety of principal.  The policy limits investments to certain types of
instruments issued by institutions with strong investment grade credit ratings
and places restrictions on their terms and concentrations by type and issuer.

Inventory is recorded at the lower of cost or market using the first-in, first-
out method and consists of the following (in thousands):

<TABLE>
<CAPTION>
                       December 31, 1996      March 31, 1996    
                       -----------------      --------------    
  <S>                  <C>                    <C>             
  Finished goods                  $  899              $1,270    
  Work in process                    240                 244    
  Raw materials                      778                 134    
                                  ------              ------    
                                                                    
  Total                           $1,917              $1,648    
</TABLE>

Equipment, Furniture, and Improvements are carried at cost.  Depreciation is
computed over the estimated useful lives of the assets, generally five years,
using accelerated methods.

                                       6
<PAGE>
 
                           IGEN INTERNATIONAL, INC.
                                   FORM 10-Q
                    FOR THE QUARTER ENDED DECEMBER 31, 1996

NOTES TO FINANCIAL STATEMENTS (UNAUDITED)

2.   Summary Of Significant Accounting Policies (continued)

Revenue Recognition - Nonrefundable license fees, option fees, and milestone
payments in connection with research and development contracts or
commercialization agreements with corporate partners are recognized when they
are earned in accordance with the applicable performance requirements and
contractual terms.  Amounts received in advance of performance under contracts
or commercialization agreements are recorded as deferred revenue until earned.
Product sales revenue is recorded as products are shipped.

Income (Loss) Per Share has been computed based on the weighted average number
of common shares and common equivalent shares outstanding during each period,
including common equivalent shares calculated for the stock options and warrants
under the treasury stock method for all periods presented.

Accounting for Stock Compensation - In 1995, the FASB issued SFAS 123
"Accounting for Stock-Based Compensation" which will be effective for the
Company's 1997 fiscal year.  SFAS 123 allows for companies to adopt a new fair-
value basis of accounting for stock options and other equity instruments, or the
disclosure-only alternative for stock based compensation.  The Company has not
yet determined whether it will elect the expense recognition or disclosure-only
alternative permitted under SFAS 123, and therefore has not yet determined the
impact of such adoption on its financial position, results of operations, and
cash flows.
 
                                       7
<PAGE>
 
                           IGEN INTERNATIONAL, INC.
                                   FORM 10-Q
                    FOR THE QUARTER ENDED DECEMBER 31, 1996

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

OVERVIEW

The Company devotes substantially all of its resources to the research and
development of its proprietary technologies, primarily the ORIGEN(R) technology
for clinical diagnostic and life science research products. The Company's
sources of revenue have consisted primarily of license or research payments
pursuant to licensing or collaborative research agreements and from product
sales. The Company has entered into arrangements with corporate collaborators
that provide for the development and marketing of certain ORIGEN systems. These
agreements provide fees and royalties payable to the Company in exchange for
licenses to produce and sell the resulting products. In the near term, the
Company may selectively pursue additional strategic alliances although, over
time, it expects an increasing amount of its revenues to be derived from sales
of its products and royalties from corporate collaborations.

Except for the historical information contained herein, the following discussion
contains forward-looking statements that involve risks and uncertainties. Actual
results might differ materially from these due to risks and uncertainties,
including the impact of competitive products and pricing, the timely development
and acceptance of new products and market conditions. A more detailed
description of these risks and other risks applicable to the Company appears in
IGEN's Annual Report on Form 10-K for the year ended March 31, 1996.

RESULTS OF OPERATIONS

THREE MONTHS ENDED DECEMBER 31, 1996 VS. DECEMBER 31, 1995

The Company had revenue of $4.5 million for the three months ended December 31,
1996, compared to revenue of $4 million for the corresponding period in 1995.
This increase is attributable to sales of the Company's ORIGEN research
instruments and reagents and cell culture products which were $1.7 million
during the current quarter compared to $1.1 million in the same period last
year.  Such product sales reflect higher placements of the ORIGEN Detection
System.  Contract revenue and other license fees remained relatively constant at
$2.8 million in 1996 as compared to $2.9 million for the same quarter in 1995,
reflecting the timing of milestones and revenues received under IGEN's
supplemental Assay Development Contract with Boehringer Mannheim GmbH.

Research and development expenses were $3.4 million for the three months ended
December 31, 1996, which represents a 6% decrease from $3.6 million for the
corresponding period in 1995. The decrease in costs in 1996 resulted from
changes in external technical collaborations.  Marketing, general and
administrative expenses were $2.9 million and $1.9 million for the three months
ended  December 31, 1996 and 1995, respectively.  This higher level of costs
resulted primarily from increased marketing efforts associated with the ORIGEN
Detection System and administrative costs associated with the Company's
reincorporation in the State of Delaware.

Results from operations over the next several years is likely to fluctuate
substantially from quarter to quarter.  These differences will result from the
timing of revenues earned under license and product development agreements along
with the associated product development expenses.

                                       8
<PAGE>
 
                           IGEN INTERNATIONAL, INC.
                                   FORM 10-Q
                    FOR THE QUARTER ENDED DECEMBER 31, 1996

Management's Discussion and Analysis of Financial Condition and Results of
Operations  (Continued)


As of March 31, 1996, the Company had a federal net operating loss and general
business credit tax carry forwards of approximately $31 million and $2.1
million, respectively.  The Company's ability to utilize its net operating loss
and general business credit tax carryforwards may be subject to an annual
limitation in future periods pursuant to the "change in ownership rules" under
Section 382 of the Internal Revenue Service Code of 1986, as amended.

NINE MONTHS ENDED DECEMBER 31, 1996 VS. DECEMBER 31, 1995

The Company had revenue of $13.9 million for the nine months ended December 31,
1996, compared to revenue of $11.6 million for the corresponding period in 1995.
This represents a $2.4 million (20%) increase which is attributable to higher
product sales of the Company's ORIGEN Detection System, reagents and cell
culture products which were $5 million and $3 million in 1996 and 1995,
respectively.  Contract revenue and license fees remained relatively constant at
$8.8 million in 1996 compared to $8.6 million in 1995.

Product costs were $2 million (39% of product sales) and $1.3 million (45% of
product sales) for the nine months ended December 31, 1996 and 1995
respectively.  This decrease is attributable to a change in the product sales
mix during the current year.

Research and development expenses decreased $374,000 (4%) to $10 million for the
nine months ended December 31, 1996, compared to $10.4 million for the
corresponding period in 1995. Decreased costs of external technical
collaborations was the primary reason for this decline. Marketing, general and
administrative expenses were $8 million and $6.2 million in 1996 and 1995,
respectively. The higher level of costs during 1996 is primarily due to
increased marketing efforts associated with the ORIGEN Detection System and
administrative costs associated with the Company's reincorporation in the State
of Delaware.

LIQUIDITY AND CAPITAL RESOURCES

The Company has financed its operations through the sale of preferred and common
stock, aggregating approximately $60 million through December 31, 1996,
collaborative research and licensing agreements and sales of its ORIGEN line of
products.  As of  December 31, 1996, the Company had $8.1 million in cash, cash
equivalents and short term investments.  Working capital was $8.7 million at
December 31, 1996.

Net cash used in operating activities was $11.6 million for the nine months
ended December 31, 1996, as compared to $12.8 million for the corresponding
period in 1995.  This $1.2 million decrease (9%) of net cash used in 1996 was
primarily due to lower accounts payable balances.

                                       9
<PAGE>
 
                           IGEN INTERNATIONAL, INC.
                                   FORM 10-Q
                    FOR THE QUARTER ENDED DECEMBER 31, 1996

Management's Discussion And Analysis Of Financial Condition And Results Of
Operations (Continued)

The Company used $555,000 and $975,000 of net cash for investing activities,
substantially related to the acquisition of laboratory equipment, furniture and
leasehold improvements, during the nine months ended December 31, 1996 and 1995,
respectively.  During the nine months ended December 31, 1995, the Company used
approximately $400,000 to repurchase shares of its stock under a Stock
Repurchase Plan.

The Company expects to incur substantial additional research and development
expenses, manufacturing costs and marketing and distribution expenses.  It is
the Company's intention to selectively seek additional collaborative or license
agreements with suitable corporate collaborators although there can be no
assurance the Company will be able to enter into such agreements or that amounts
received under such agreements will reduce substantially the Company's funding
requirements. Additional equity or debt financing may be required, and there can
be no assurance that these funds may be available on favorable terms, if at all.

The Company's future capital requirements depend on many factors, including
continued scientific progress in its diagnostics programs, the magnitude of
these programs, the time and costs involved in obtaining regulatory approvals,
the costs involved in filing, prosecuting and enforcing patent claims, competing
technological and market developments, changes in its existing license and other
agreements, the ability of the Company to establish development arrangements,
the cost of manufacturing scale-up and effective commercialization activities
and arrangements.

PART II  OTHER INFORMATION
- --------------------------

Item 2.  Changes in Securities

On November 6, 1996, the Board of Directors of IGEN International, Inc.
(the "Company") approved the adoption of a Rights Agreement dated as of November
6, 1996 (the "Rights Agreement"), between the Company and the First National
Bank of Boston as Rights Agent (the "Rights Agent").  Each Preferred Share
Purchase Right (a "Right") entitles the registered holder to purchase from the
Company one one-hundredth of a share of Series A Junior Participating Preferred
Stock, par value $.001 per share (the "Preferred Shares"), of the Company at a
price of $65.00 per one one-hundredth of a Preferred Share (the "Purchase
Price"), subject to adjustment.

Initially, the Rights will be evidenced by the stock certificates
representing Common Shares then outstanding, and no separate Right Certificates,
as defined, will be distributed.  Until the earlier to occur of (i) the
acquisition by a person or group of affiliated or associated persons, (other
than (A) the Company, (B) a majority owned subsidiary of the Company, (C) any
employee benefit plan of the Company or any majority-owned subsidiary of the
Company, (D) any entity holding Common Shares for or pursuant to the terms of
any such plan or (E) Mr. Samuel J. Wohlstadter, his affiliates and associates,
his heirs, and any trust or foundation to which he has transferred or may
transfer Common Shares of the Company ("Samuel Wohlstadter") and each of the
persons listed in (A) through (E) above, an "excepted person") of beneficial
ownership of 15% or more of the outstanding Common Shares (an "Acquiring
Person") or (ii) 10 business days (or such later date as may be determined by
action of the Board of Directors prior to such time as any person or group of
affiliated persons becomes an Acquiring Person) following the commencement of,
or announcement of an intention to make, a tender offer or exchange offer the
consummation of which would result in the beneficial ownership by a person or
group of 15% or more of the outstanding Common Shares (the earlier of such dates
being called the "Distribution Date"), the Rights will be evidenced, with
respect to any of the Common Share certificates outstanding as of the Record
Date, by such Common Share certificate with a copy of this Summary of Rights
attached thereto.

Until the Distribution Date (or earlier redemption or expiration of the
Rights), the Rights will be transferred with and only with the Common Shares.
Until the Distribution Date (or earlier redemption or expiration of the 

                                       10
<PAGE>
 
Rights), new Common Share certificates issued after the Record Date upon
transfer or new issuance of Common Shares will contain a notation incorporating
the Rights Agreement by reference. Until the Distribution Date (or earlier
redemption or expiration of the Rights) the surrender or transfer of any
certificates for Common Shares outstanding as of the Record Date will also
constitute the transfer of the Rights associated with the Common Shares
represented by such certificate. As soon as practicable following the
Distribution Date, separate certificates evidencing the Rights ("Right
Certificates") will be mailed to holders of record of the Common Shares as of
the close of business on the Distribution Date and such separate Right
Certificates alone will evidence the Rights.
 
The Rights are not exercisable until the Distribution Date.  The Rights
will expire on November 6, 2006 (the "Final Expiration Date"), unless the Final
Expiration Date is extended or unless the Rights are earlier redeemed or
exchanged by the Company, in each case, as described below.

The Purchase Price payable, and the number of Preferred Shares or other
securities or property issuable, upon exercise of the Rights are subject to
adjustment from time to time to prevent dilution (i) in the event of a stock
dividend on, or a subdivision, combination or reclassification of, the Preferred
Shares, (ii) upon the grant to holders of the Preferred Shares of certain rights
or warrants to subscribe for or purchase Preferred Shares at a price, or
securities convertible into Preferred Shares with a conversion price, less than
the then-current market price of the Preferred Shares or (iii) upon the
distribution to holders of the Preferred Shares of evidences of indebtedness or
assets (excluding regular periodic cash dividends paid out of earnings or
retained earnings or dividends payable in Preferred Shares) or of subscription
rights or warrants (other than those referred to above).

The number of outstanding Rights and the number of one one-hundredths of a
Preferred Share issuable upon exercise of each Right are also subject to
adjustment in the event of a stock split of the Common Shares or a stock
dividend on the Common Shares payable in Common Shares or subdivisions,
consolidations or combinations of the Common Shares occurring, in any such case,
prior to the Distribution Date.

Preferred Shares purchasable upon exercise of the Rights will not be
redeemable.  Each Preferred Share will be entitled to a minimum preferential
quarterly dividend payment of $l per share but will be entitled to an aggregate
dividend of 100 times the dividend declared per Common Share.  In the event of
liquidation, the holders of the Preferred Shares will be entitled to a minimum
preferential liquidation payment of $100 per share but will be entitled to an
aggregate payment of 100 times the payment made per Common Share.  Each
Preferred Share will have 100 votes, voting together with the Common Shares.
Finally, in the event of any merger, consolidation or other transaction in which
Common Shares are exchanged, each Preferred Share will be entitled to receive
100 times the amount received per Common Share.  These rights are protected by
customary anti-dilution provisions.  Because of the nature of the Preferred
Shares' dividend, liquidation and voting rights, the value of the one one-
hundredth interest in a Preferred Share purchasable upon exercise of each Right
should approximate the value of one Common Share.  The Preferred Shares rank
junior to all other series of the Company's preferred stock.

In the event that the Company is acquired by any person, other than Samuel
Wohlstadter, in a merger or other business combination transaction or 50% or
more of its consolidated assets or earning power are sold to any person other
than Samuel Wohlstadter, proper provision will be made so that each holder of a
Right will thereafter have the right to receive, upon the exercise thereof at
the then current exercise price of the Right, that number of shares of common
stock of the acquiring company which at the time of such transaction will have a
market value of two times the exercise price of the Right.  In the event that
any person or group of affiliated or associated persons becomes an Acquiring
Person, proper provision shall be made so that each

                                      11

<PAGE>
 
holder of a Right, other than Rights beneficially owned by the Acquiring Person
(which will thereafter be void), will thereafter have the right to receive upon
exercise that number of Common Shares having a market value of two times the
exercise price of the Right.

At any time after any Person becomes an Acquiring Person and prior to the
acquisition by such person or group of 50% or more of the outstanding Common
Shares, the Board of Directors of the Company may exchange the Rights (other
than Rights owned by such person or group which will have become void), in whole
or in part, at an exchange ratio of one Common Share, or one one-hundredth of a
Preferred Share (or of a share of a class or series of the Company's preferred
stock having equivalent rights, preferences and privileges), per Right (subject
to adjustment).

With certain exceptions, no adjustment in the Purchase Price will be
required until cumulative adjustments require an adjustment of at least 1% in
such Purchase Price.  No fractional Preferred Shares will be issued (other than
fractions which are integral multiples of one one-hundredth of a Preferred
Share, which may, at the election of the Company, be evidenced by depositary
receipts) and in lieu thereof, an adjustment in cash will be made based on the
market price of the Preferred Shares on the last trading day prior to the date
of exercise.

The Rights have certain anti-takeover effects.  The Rights will cause
substantial dilution to a person or group that attempts to acquire the Company
on terms not approved by the Company's Board of Directors.  The Rights should
not interfere with any merger or other business combination approved by the
Board of Directors since at any time prior to the earliest of (i) the time a
person has become an Acquiring Person, or (ii) the Final Expiration Date, the
Board of Directors of the Company may redeem the Rights in whole, but not in
part, at a price of $.01 per Right (the "Redemption Price").  Following the
expiration of the above periods, the Rights become nonredeemable.  Immediately
upon any redemption of the Rights, the right to exercise the Rights will
terminate and the only right of the holders of Rights will be to receive the
Redemption Price.

The terms of the Rights may be amended by the Board of Directors of the
company without the consent of the holders of the Rights, including an amendment
to lower certain thresholds described above to any percentage which is (i)
greater than the largest percentage of the outstanding Common Shares then known
to the Company to be beneficially owned by any person or group of affiliated or
associated persons (other than an excepted person) and (ii) not less than 10%,
except that from and after such time as any person or group of affiliated or
associated persons becomes an Acquiring Person no such amendment may adversely
affect the interests of the holders of the Rights.

Until a Right is exercised, the holder thereof, as such, will have no
rights as a stockholder of the Company, including, without limitation, the right
to vote or to receive dividends.



                                      12
<PAGE>

Item 6.  Exhibits and Reports on Form 8-K
 
     (a)  Exhibits:

          2.1  Agreement and Plan of Merger effective November 19, 1996 (by 
               virtue of a reincorporation), by and between IGEN, Inc., a
               California corporation, and IGEN International, Inc., a Delaware
               corporation.

          3.1  The Registrant's (as successor in interest to IGEN, Inc. by 
               virtue of a reincorporation effective November 19, 1996)
               Certificate of Incorporation, as filed with the Secretary of
               State of the State of Delaware on August 30, 1996.

          3.2  The Registrant's Certificate of Designation of Series A Junior
               Participating Preferred Stock, as filed with the Secretary of
               State of the State of Delaware on November 18, 1996.

          3.3  The Registrant's (as successor in interest to IGEN, Inc. by 
               virtue of a reincorporation effective November 19, 1996) Bylaws,
               as currently in effect.

          4.1  Form of Specimen Right Certificate.(1)

          4.2  Rights Agreement, dated as of November 6, 1996, between the
               Registrant and The First National Bank of Boston.(2)

          11.1 Statements regarding computation of per share earnings for the
               three months and nine months ended December 31, 1996 and 1995.

          27.1 Financial Data Schedule.

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

               (1)  Incorporated by reference to Exhibit 1.1 of the Registrant's
                    Form 8-A filed with the Securities and Exchange Commission 
                    on December 11, 1996.

               (2)  Incorporated by reference to Exhibit 2.1 of the Registrant's
                    Form 8-A filed with the Securities and Exchange Commission 
                    on December 11, 1996.

     (b)  Reports on Form 8-K:

          None


                                      13
<PAGE>
 
                           IGEN INTERNATIONAL, INC.
                                   FORM 10-Q
                    FOR THE QUARTER ENDED DECEMBER 31, 1996

                                  SIGNATURES


Pursuant to the requirements 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.


                                   IGEN International, Inc.



Date:     February 13, 1996        /s/ George V. Migausky
          -----------------        ____________________________________________
                                   George V. Migausky
                                   Vice President of Finance and Chief Financial
                                   Officer 
                                   (On behalf of the Registrant and as Principal
                                   Financial Officer)

                                       14
<PAGE>

 
                                 EXHIBIT INDEX
                                 -------------
                                        


Exhibit Number                   Description                          
- --------------          -----------------------------                 


   2.1         Agreement and Plan of Merger effective November 19, 1996 (by 
               virtue of a reincorporation), by and between IGEN, Inc., a
               California corporation, and IGEN International, Inc., a Delaware
               corporation.

   3.1         The Registrant's (as successor in interest to IGEN, Inc. by 
               virtue of a reincorporation effective November 19, 1996)
               Certificate of Incorporation, as filed with the Secretary of
               State of the State of Delaware on August 30, 1996.

   3.2         The Registrant's Certificate of Designation of Series A Junior
               Participating Preferred Stock, as filed with the Secretary of
               State of the State of Delaware on November 18, 1996.

   3.3         The Registrant's (as successor in interest to IGEN, Inc. by 
               virtue of a reincorporation effective November 19, 1996) Bylaws,
               as currently in effect.

   4.1         Form of Specimen Right Certificate.(1)

   4.2         Rights Agreement, dated as of November 6, 1996, between the
               Registrant and The First National Bank of Boston.(2)

  11.1         Statements regarding computation of per share earnings for the
               three months and nine months ended December 31, 1996 and 1995.

  27.1         Financial Data Schedule.

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

               (1)  Incorporated by reference to Exhibit 1.1 of the Registrant's
                    Form 8-A filed on December 11, 1996.

               (2)  Incorporated by reference to Exhibit 2.1 of the Registrant's
                    Form 8-A filed on December 11, 1996.
 






















<PAGE>
 


                           IGEN INTERNATIONAL, INC.
                                  EXHIBIT 2.1

                          AGREEMENT AND PLAN OF MERGER


     THIS AGREEMENT AND PLAN OF MERGER (the "Merger Agreement") is made as of
September 10, 1996, by and between IGEN, INC., a California corporation ("IGEN
California"), and IGEN INTERNATIONAL, INC., a Delaware corporation ("IGEN
Delaware").  IGEN California and IGEN Delaware are sometimes referred to as the
"Constituent Corporations."

     The authorized capital stock of IGEN California consists of 50,000,000
shares of Common Stock, $.001 par value, and 10,000,000 shares of Preferred
Stock, $.001 par value, of which 600,000 shares have been designated Series A
Junior Preferred Stock and none of which are issued and outstanding as of the
date hereof.  The authorized capital stock of IGEN Delaware, upon effectuation
of the transactions set forth in this Merger Agreement, will consist of
50,000,000 shares of Common Stock, $.001 par value, and 10,000,000 shares of
Preferred Stock, $.001 par value, of which 600,000 shares have been designated
Series A Junior Preferred Stock and none of which are issued and outstanding as
of the date hereof.

     The directors of the Constituent Corporations deem it advisable and to the
advantage of said corporations that IGEN California merge into IGEN Delaware
upon the terms and conditions herein provided.

     NOW, THEREFORE, the parties do hereby adopt the plan of reorganization
encompassed by this Merger Agreement and do hereby agree that IGEN California
shall merge into IGEN Delaware on the following terms, conditions and other
provisions:

1.   TERMS AND CONDITIONS.

     1.1.   Merger.  IGEN California shall be merged with and into IGEN Delaware
(the "Merger"), and IGEN Delaware shall be the surviving corporation (the
"Surviving Corporation") effective upon the date when this Merger Agreement is
filed with the Secretary of State of the State of Delaware (the "Effective
Date").

     1.2.   Succession.  On the Effective Date, IGEN Delaware shall continue its
corporate existence under the laws of the State of Delaware, and the separate
existence and corporate organization of IGEN California, except insofar as it
may be continued by operation of law, shall be terminated and cease.

     1.3.   Transfer of Assets and Liabilities.  On the Effective Date, the
rights, privileges, powers and franchises, both of a public as well as of a
private nature, of each of the Constituent Corporations shall be vested in and
possessed by the Surviving Corporation, subject to all of the disabilities,
duties and restrictions of or upon each of the Constituent Corporations; and all
and singular rights, privileges, powers and franchises of each of the
Constituent Corporations, and all property, real, personal and mixed, of each of
the Constituent Corporations, and all debts due to each of the Constituent
Corporations on whatever account, and all things in action or belonging to each
of the 

<PAGE>
 
Constituent Corporations shall be transferred to and vested in the Surviving
Corporation; and all property, rights, privileges, powers and franchises, and
all and every other interest, shall be thereafter the property of the Surviving
Corporation as they were of the Constituent Corporations, and the title to any
real estate vested by deed or otherwise in either of the Constituent
Corporations shall not revert or be in any way impaired by reason of the Merger;
provided, however, that the liabilities of the Constituent Corporations and of
their shareholders, directors and officers shall not be affected and all rights
of creditors and all liens upon any property of either of the Constituent
Corporations shall be preserved unimpaired, and any claim existing or action or
proceeding pending by or against either of the Constituent Corporations may be
prosecuted to judgment as if the Merger had not taken place except as they may
be modified with the consent of such creditors and all debts, liabilities and
duties of or upon each of the Constituent Corporations shall attach to the
Surviving Corporation, and may be enforced against it to the same extent as if
such debts, liabilities and duties had been incurred or contracted by it.

     1.4.   Common Stock of IGEN California and IGEN Delaware.  On the Effective
Date, by virtue of the Merger and without any further action on the part of the
Constituent Corporations or their shareholders, (i) each share of Common Stock
of IGEN California issued and outstanding immediately prior thereto shall be
changed and converted into one fully paid and nonassessable share of the Common
Stock of IGEN Delaware, (ii) resulting fractional shares shall not be issued,
but holders of fractional shares shall be compensated, based upon the closing
price of the Common Stock on the Nasdaq National Market on the Effective Date,
and (iii) each share of Common Stock of IGEN Delaware issued and outstanding
immediately prior thereto shall be cancelled and returned to the status of
authorized but unissued shares.

     1.5.   Stock Certificates.  On and after the Effective Date, all of the
outstanding certificates which prior to that time represented shares of the
Common Stock of IGEN California shall be deemed for all purposes to evidence
ownership of and to represent the shares of IGEN Delaware into which the shares
of IGEN California represented by such certificates have been converted as
herein provided and shall be so registered on the books and records of the
Surviving Corporation or its transfer agent.  The registered owner of any such
outstanding stock certificate shall, until such certificate shall have been
surrendered for transfer or conversion or otherwise accounted for to the
Surviving Corporation or its transfer agent, have and been entitled to exercise
any voting and other rights with respect to and to receive any dividend and
other distributions upon the shares of IGEN Delaware evidenced by such
outstanding certificate as above provided.

     1.6.   Options.  On the Effective Date, the Surviving Corporation will
assume and continue all of IGEN California's stock option plans in existence on
the Effective Date, including without limitation the 1985 Stock Option Plan, the
401(k) Plan and the outstanding and unexercised portions of all options to
purchase Common Stock of IGEN California, including without limitation all
options outstanding under such stock option plans and any other outstanding
options, shall be combined, changed, and converted into options of IGEN Delaware
such that an option for one share of IGEN California shall be converted into an
option for one share of IGEN Delaware.  Effective on the Effective Date, IGEN
Delaware hereby assumes the outstanding and unexercised portions of such options
and the obligations of IGEN California with respect thereto.

                                      2.
<PAGE>
 
     1.7. 1996 Preferred Share Purchase Plan. On the Effective Date, the 1996
Preferred Share Purchase Plan approved and adopted by IGEN California's Board of
Directors on December 14, 1995, will be terminated.

     1.8.   Employee Benefit Plans.  On the Effective Date, the Surviving
Corporation shall assume all obligations of IGEN California under any and all
employee benefit plans in effect as of such date with respect to which employee
rights or accrued benefits are outstanding as of such date; provided, however,
that one share of Common Stock of IGEN Delaware shall be substituted for each
share of Common Stock of IGEN California (if any) thereunder.  On the Effective
Date, the Surviving Corporation shall adopt and continue in effect all such
employee benefit plans upon the same terms and conditions as were in effect
immediately prior to the Merger and shall reserve that number of shares of IGEN
Delaware Common Stock with respect to each such employee benefit plan as is
proportional to that number of shares of IGEN California Common Stock (if any)
so reserved on the Effective Date.

2.  CHARTER DOCUMENTS.

     2.1.   Certificate of Incorporation.  The Certificate of Incorporation of
IGEN Delaware in effect on the Effective Date shall continue to be the
Certificate of Incorporation of the Surviving Corporation.

3.  MISCELLANEOUS.

     3.1.   Further Assurances.  From time to time, and when required by the
Surviving Corporation or by its successors and assigns, there shall be executed
and delivered on behalf of IGEN California such deeds and other instruments, and
there shall be taken or caused to be taken by it such further and other action,
as shall be appropriate or necessary in order to vest or perfect in or to
conform of record or otherwise, in the Surviving Corporation the title to and
possession of all the property, interests, assets, rights, privileges,
immunities, powers, franchises and authority of IGEN California and otherwise to
carry out the purposes of this Merger Agreement, and the officers and directors
of the Surviving Corporation are fully authorized in the name and on behalf of
IGEN California or otherwise to take any and all such action and to execute and
deliver any and all such deeds and other instruments.

     3.2.   Amendment.  At any time before or after approval by the shareholders
of IGEN California, this Merger Agreement may be amended in any manner (except
that, after the approval of the Merger Agreement by the shareholders of IGEN
California, the principal terms may not be 

                                      3.
<PAGE>
 
amended without the further approval of the shareholders of IGEN California) as
may be determined in the judgment of the respective Board of Directors of IGEN
Delaware and IGEN California to be necessary, desirable, or expedient in order
to clarify the intention of the parties hereto or to effect or facilitate the
purpose and intent of this Merger Agreement.

     3.3.   Conditions to Merger. The obligation of the Constituent Corporations
to effect the transactions contemplated hereby is subject to satisfaction of the
following conditions (any or all of which may be waived by either of the
Constituent Corporations in its sole discretion to the extent permitted by law):

            (a)   the Merger shall have been approved by the shareholders of
IGEN California in accordance with applicable provisions of the General
Corporation Law of the State of California; and

            (b)   IGEN California, as sole stockholder of IGEN Delaware, shall
have approved the Merger in accordance with the General Corporation Law of the
State of Delaware; and

            (c)   any and all consents, permits, authorizations, approvals, and
orders deemed in the sole discretion of IGEN California to be material to
consummation of the Merger shall have been obtained.

     3.4.   Abandonment or Deferral. At any time before the Effective Date, this
Merger Agreement may be terminated and the Merger may be abandoned by the Board
of Directors of either IGEN California or IGEN Delaware or both, notwithstanding
the approval of this Merger Agreement by the shareholders of IGEN California or
IGEN Delaware, or the consummation of the Merger may be deferred for a
reasonable period of time if, in the opinion of the Board of Directors of IGEN
California and IGEN Delaware, such action would be in the best interest of such
corporations. In the event of termination of this Merger Agreement, this Merger
Agreement shall become void and of no effect and there shall be no liability on
the part of either Constituent Corporation or its Board of Directors or
shareholders with respect thereto, except that IGEN California shall pay all
expenses incurred in connection with the Merger or in respect of this Merger
Agreement or relating thereto.

     3.5.   Counterparts.  In order to facilitate the filing and recording of
this Merger Agreement, the same may be executed in any number of counterparts,
each of which shall be deemed to be an original.

                                      4.
<PAGE>
 
     IN WITNESS WHEREOF, this Merger Agreement, having first been duly approved
by the Board of Directors of IGEN California and IGEN Delaware, is hereby
executed on behalf of each said corporation and attested by their respective
officers thereunto duly authorized.

                                      IGEN, Inc.
                                      a California corporation



                                      By /s/ Richard J. Massey
                                        ----------------------------------------
                                         Richard J. Massey
                                         President and Chief Operating Officer


ATTEST:



/s/ Andrei M. Manoliu
- ----------------------------------
Andrei M. Manoliu
Secretary


                                      IGEN International, Inc.
                                      a Delaware corporation



                                      By /s/ Richard J. Massey
                                        ----------------------------------------
                                         Richard J. Massey
                                         President and Chief Operating Officer  
                                           


ATTEST:



/s/ Andrei M. Manoliu
- ---------------------------------- 
Andrei M. Manoliu
Secretary


                                      5.
<PAGE>
 
                            IGEN International, INC.
                  OFFICERS' CERTIFICATE OF APPROVAL OF MERGER


     The undersigned, Richard J. Massey and Andrei M. Manoliu, do hereby
certify that:

     1.   They are the President and Chief Operating Officer and Secretary,
respectively, of IGEN International, Inc., a Delaware corporation (the
"Corporation").

     2.   The Agreement and Plan of Merger attached to this Certificate
providing for the merger of IGEN, Inc., a California corporation, with and into
the Corporation was duly approved by the Board of Directors and by the
stockholder of the Corporation. 

     3.   The Corporation has two authorized classes of shares designated
Common Stock and Preferred Stock.  The number of shares of Common Stock
outstanding and entitled to vote upon the merger was One Thousand (1,000) shares
of Common Stock.  There are no shares of Preferred Stock outstanding. 

     4.   The terms of the Agreement and Plan of Merger were approved by the
Corporation by the vote of more than fifty percent (50%) of the outstanding
shares of Common Stock of the Corporation, which equaled or exceeded the vote
required. 

     IN WITNESS WHEREOF, the undersigned have executed this Certificate this
10th day of September, 1996.




                                      /s/ Richard J. Massey
                                      ----------------------------------------
                                      Richard J. Massey
                                      President and Chief Operating Officer



                                      /s/ Andrei M. Manoliu
                                      ----------------------------------------
                                      Andrei M. Manoliu
                                      Secretary


        
<PAGE>
 
     Each of the undersigned declares under penalty of perjury that he has read
the foregoing Certificate and knows the contents thereof and that the same is
true of his own knowledge.

     Executed at Gaithersburg, Maryland on September 10, 1996.



                                          
                                         /s/ Richard J. Massey
                                      -----------------------------------------
                                         Richard J. Massey
                                         President and Chief Operating Officer



                                        /s/ Andrei M. Manoliu
                                      -----------------------------------------
                                         Andrei M. Manoliu
                                         Secretary


                                      2.
<PAGE>
 
                                   IGEN, INC.
                  OFFICERS' CERTIFICATE OF APPROVAL OF MERGER


     The undersigned, Richard J. Massey and Andrei M. Manoliu, do hereby
certify that:

     1.   They are the President and Chief Operating Officer and Secretary,
respectively, of IGEN, Inc., a California corporation (the "Corporation").

     2.   The Agreement and Plan of Merger attached to this Certificate
providing for the merger of the Corporation, with and into IGEN International,
Inc., a Delaware Corporation, was duly approved by the Board of Directors and by
the shareholders of the Corporation. 

     3.  The Corporation has two authorized classes of shares, designated Common
Stock and Preferred Stock. The total number of outstanding shares of Common
Stock as of September 10, 1996 was 14,965,476. No shares of Preferred Stock
are outstanding. All outstanding shares of stock were entitled to vote on the
merger.

     4.  The terms of the Agreement and Plan of Merger were approved by the
Corporation by the vote of more than fifty percent (50%) of the outstanding
shares of Common Stock, which equaled or exceeded the vote required. 

     IN WITNESS WHEREOF, the undersigned have executed this Certificate this
10th day of September, 1996.



 
                                      /s/ Richard J. Massey
                                      ----------------------------------------
                                          Richard J. Massey
                                          President and Chief Operating Officer


 
                                      /s/ Andrei M. Manoliu
                                      ----------------------------------------
                                         Andrei M. Manoliu
                                         Secretary



<PAGE>
 
     Each of the undersigned declares under penalty of perjury that he has read
the foregoing Certificate and knows the contents thereof and that the same is
true of his own knowledge.

     Executed at Gaithersburg, Maryland on September 10, 1996.



 
                                        /s/ Richard J. Massey
                                      -----------------------------------------
                                         Richard J. Massey
                                         President and Chief Operating Officer




                                        /s/ Andrei M. Manoliu
                                      ----------------------------------------- 
                                         Andrei M. Manoliu
                                         Secretary



                                      2.

<PAGE>
 
                            IGEN INTERNATIONAL INC.
                                  EXHIBIT 3.1

                         CERTIFICATE OF INCORPORATION

                                      OF

                           IGEN INTERNATIONAL, INC.


     The undersigned, a natural person (the "Sole Incorporator"), for the
purpose of organizing a corporation to conduct the business and promote the
purposes hereinafter stated, under the provisions and subject to the
requirements of the laws of the State of Delaware hereby certifies that:

                                      I.

     The name of this corporation is IGEN International, Inc.

                                      II.

     The address of the registered office of the corporation in the State of
Delaware is 1013 Centre Road, City of Wilmington, County of New Castle, and the
name of the registered agent of the corporation in the State of Delaware at such
address is The Prentice-Hall Corporation System, Inc.

                                     III.

     The purpose of this corporation is to engage in any lawful act or activity
for which a corporation may be organized under the General Corporation Law of
the State of Delaware.

                                      IV.

     A.   This corporation is authorized to issue two classes of stock to be
designated, respectively, "Common Stock" and "Preferred Stock."  The total
number of shares which the corporation is authorized to issue is Sixty Million
(60,000,000) shares.  Fifty Million (50,000,000) shares shall be Common Stock,
each having a par value of one-tenth of one cent ($.001).  Ten Million
(10,000,000) shares shall be Preferred Stock, each having a par value of one-
tenth of one cent ($.001).

     B.   The Preferred Stock may be issued from time to time in one or more
series.  The Board of Directors is hereby authorized, by filing a certificate (a
"Preferred Stock Designation") pursuant to the Delaware General Corporation Law,
to fix or alter from time to time the designation, powers, preferences and
rights of the shares of each such series and the qualifications, limitations or
restrictions of any wholly unissued series of Preferred Stock, and to 

                                      1.
<PAGE>
 
establish from time to time the number of shares constituting any such series or
any of them; and to increase or decrease the number of shares of any series
subsequent to the issuance of shares of that series, but not below the number of
shares of such series then outstanding. In case the number of shares of any
series shall be decreased in accordance with the foregoing sentence, the shares
constituting such decrease shall resume the status that they had prior to the
adoption of the resolution originally fixing the number of shares of such
series.

     C.   Six Hundred Thousand (600,000) shares of Preferred Stock, $.001 par
value, are hereby designated "Series A Junior Participating Preferred Stock"
with the rights, preferences, privileges and restrictions specified herein (the
"Junior Preferred Stock").  Such number of shares may be increased or decreased
by resolution of the Board of Directors; provided, that no decrease shall reduce
the number of shares of Junior Preferred Stock to a number less than the number
of shares then outstanding plus the number of shares reserved for issuance upon
the exercise of outstanding options, rights or warrants or upon the conversion
of any outstanding securities issued by the corporation convertible into Junior
Preferred Stock.

          (1)  Dividends and Distributions.

               (a)  Subject to the rights of the holders of any shares of any
series of Preferred Stock (or any similar stock) ranking prior and superior to
the Junior Preferred Stock with respect to dividends, the holders of shares of
Junior Preferred Stock, in preference to the holders of Common Stock, par value
$.001 per share (the "Common Stock"), of the corporation, and of any other
junior stock, shall be entitled to receive, when, as and if declared by the
Board of Directors out of funds legally available for the purpose, quarterly
dividends payable in cash on the first day of March, June, September and
December in each year (each such date being referred to herein as a "Quarterly
Dividend Payment Date"), commencing on the first Quarterly Dividend Payment Date
after the first issuance of a share or fraction of a share of Junior Preferred
Stock, in an amount per share (rounded to the nearest cent) equal to the greater
of (a) $l.00 or (b) subject to the provision for adjustment hereinafter set
forth, 100 times the aggregate per share amount of all cash dividends, and 100
times the aggregate per share amount (payable in kind) of all non-cash dividends
or other distributions, other than a dividend payable in shares of Common Stock
or a subdivision of the outstanding shares of Common Stock (by reclassification
or otherwise) declared on the Common Stock since the immediately preceding
Quarterly Dividend Payment Date or, with respect to the first Quarterly Dividend
Payment Date, since the first issuance of any share or fraction of a share of
Junior Preferred Stock. In the event the corporation shall at any time declare
or pay any dividend on the Common Stock payable in shares of Common Stock, or
effect a subdivision or combination or consolidation of the outstanding shares
of Common Stock (by reclassification or otherwise than by payment of a dividend
in shares of Common Stock) into a greater or lesser number of shares of Common
Stock, then in each such case the amount to which holders of shares of Junior
Preferred Stock were entitled immediately prior to such event under clause (b)
of the preceding sentence shall be adjusted by multiplying such amount by a
fraction, the numerator of which is the number of shares of 

                                      2.
<PAGE>
 
Common Stock outstanding immediately after such event and the denominator of
which is the number of shares of Common Stock that were outstanding immediately
prior to such event.

               (b)  The corporation shall declare a dividend or distribution on
the Junior Preferred Stock as provided in paragraph (A) of this Section
immediately after it declares a dividend or distribution on the Common Stock
(other than a dividend payable in shares of Common Stock); provided that, in the
event no dividend or distribution shall have been declared on the Common Stock
during the period between any Quarterly Dividend Payment Date and the next
subsequent Quarterly Dividend Payment Date, a dividend of $1.00 per share on the
Junior Preferred Stock shall nevertheless be payable on such subsequent
Quarterly Dividend Payment Date.

               (c)  Dividends shall begin to accrue and be cumulative on
outstanding shares of Junior Preferred Stock from the Quarterly Dividend Payment
Date next preceding the date of issue of such shares, unless the date of issue
of such shares is prior to the record date for the first Quarterly Dividend
Payment Date, in which case dividends on such shares shall begin to accrue from
the date of issue of such shares, or unless the date of issue is a Quarterly
Dividend Payment Date or is a date after the record date for the determination
of holders of shares of Junior Preferred Stock entitled to receive a quarterly
dividend and before such Quarterly Dividend Payment Date, in either of which
events such dividends shall begin to accrue and be cumulative from such
Quarterly Dividend Payment Date. Accrued but unpaid dividends shall not bear
interest. Dividends paid on the shares of Junior Preferred Stock in an amount
less than the total amount of such dividends at the time accrued and payable on
such shares shall be allocated pro rata on a share-by-share basis among all such
shares at the time outstanding. The Board of Directors may fix a record date for
the determination of holders of shares of Junior Preferred Stock entitled to
receive payment of a dividend or distribution declared thereon, which record
date shall be not more than 60 days prior to the date fixed for the payment
thereof.

          (2)  Voting Rights.  The holders of shares of Junior Preferred Stock
shall have the following voting rights:

               (a)  Subject to the provision for adjustment hereinafter set
forth, each share of Junior Preferred Stock shall entitle the holder thereof to
100 votes on all matters submitted to a vote of the shareholders of the
corporation. In the event the corporation shall at any time declare or pay any
dividend on the Common Stock payable in shares of Common Stock, or effect a
subdivision or combination or consolidation of the outstanding shares of Common
Stock (by reclassification or otherwise than by payment of a dividend in shares
of Common Stock) into a greater or lesser number of shares of Common Stock, then
in each such case the number of votes per share to which holders of shares of
Junior Preferred Stock were entitled immediately prior to such event shall be
adjusted by multiplying such number by a fraction, the numerator of which is the
number of shares of Common Stock outstanding immediately after such event and
the denominator of which is the number of shares of Common Stock that were
outstanding immediately prior to such event.

                                      3.
<PAGE>
 
               (b)  Except as otherwise provided herein, in any other
Certificate of Determination of Preferences creating a series of Preferred Stock
or any similar stock, or by law, the holders of shares of Junior Preferred Stock
and the holders of shares of Common Stock and any other capital stock of the
corporation having general voting rights shall vote together as one class on all
matters submitted to a vote of shareholders of the corporation.

               (c)  Except as set forth herein, or as otherwise provided by law,
holders of Junior Preferred Stock shall have no special voting rights and their
consent shall not be required (except to the extent they are entitled to vote
with holders of Common Stock as set forth herein) for taking any corporate
action.

          (3)  Certain Restrictions.

               (a)  Whenever quarterly dividends or other dividends or
distributions payable on the Junior Preferred Stock as provided in Section 2 are
in arrears, thereafter and until all accrued and unpaid dividends and
distributions, whether or not declared, on shares of Junior Preferred Stock
outstanding shall have been paid in full, the corporation shall not:

                    (i)    declare or pay dividends, or make any other
distributions, on any shares of stock ranking junior (either as to dividends or
upon liquidation, dissolution or winding up) to the Junior Preferred Stock;

                    (ii)   declare or pay dividends, or make any other
distributions, on any shares of stock ranking on a parity (either as to
dividends or upon liquidation, dissolution or winding up) with the Junior
Preferred Stock, except dividends paid ratably on the Junior Preferred Stock and
all such parity stock on which dividends are payable or in arrears in proportion
to the total amounts to which the holders of all such shares are then entitled;

                    (iii)  redeem or purchase or otherwise acquire for
consideration shares of any stock ranking junior (either as to dividends or upon
liquidation, dissolution or winding up) to the Junior Preferred Stock, provided
that the corporation may at any time redeem, purchase or otherwise acquire
shares of any such junior stock in exchange for shares of any stock of the
corporation ranking junior (either as to dividends or upon dissolution,
liquidation or winding up) to the Junior Preferred Stock; or

                    (iv)   redeem or purchase or otherwise acquire for
consideration any shares of Junior Preferred Stock, or any shares of stock
ranking on a parity with the Junior Preferred Stock, except in accordance with a
purchase offer made in writing or by publication (as determined by the Board of
Directors) to all holders of such shares upon such terms as the Board of
Directors, after consideration of the respective annual dividend rates and other
relative rights and preferences of the respective series and classes, shall
determine in good faith will result in fair and equitable treatment among the
respective series or classes.

                                      4.
<PAGE>
 
               (b)  The corporation shall not permit any subsidiary of the
corporation to purchase or otherwise acquire for consideration any shares of
stock of the corporation unless the corporation could, under paragraph (A) of
this Section 4, purchase or otherwise acquire such shares at such time and in
such manner.

          (4)  Reacquired Shares. Any shares of Junior Preferred Stock purchased
or otherwise acquired by the corporation in any manner whatsoever shall be
retired and cancelled promptly after the acquisition thereof. All such shares
shall upon their cancellation become authorized but unissued shares of Preferred
Stock and may be reissued as part of a new series of Preferred Stock subject to
the conditions and restrictions on issuance set forth herein, in the Amended and
Restated Articles of Incorporation, or in any other Certificate of Determination
of Preferences creating a series of Preferred Stock or any similar stock or as
otherwise required by law.

          (5)  Liquidation, Dissolution or Winding Up.  Upon any liquidation,
dissolution or winding up of the corporation, no distribution shall be made (1)
to the holders of shares of stock ranking junior (either as to dividends or upon
liquidation, dissolution or winding up) to the Junior Preferred Stock unless,
prior thereto, the holders of shares of Junior Preferred Stock shall have
received the greater of: (A) $100 per share, plus an amount equal to accrued and
unpaid dividends and distributions thereon, whether or not declared, to the date
of such payment; or (B) an aggregate amount per share, subject to the provision
for adjustment hereinafter set forth, equal to 100 times the aggregate amount to
be distributed per share to holders of shares of Common Stock, or (2) to the
holders of shares of stock ranking on a parity (either as to dividends or upon
liquidation, dissolution or winding up) with the Junior Preferred Stock, except
distributions made ratably on the Junior Preferred Stock and all such parity
stock in proportion to the total amounts to which the holders of all such shares
are entitled upon such liquidation, dissolution or winding up.  In the event the
corporation shall at any time declare or pay any dividend on the Common Stock
payable in shares of Common Stock, or effect a subdivision or combination or
consolidation of the outstanding shares of Common Stock (by reclassification or
otherwise than by payment of a dividend in shares of Common Stock) into a
greater or lesser number of shares of Common Stock, then in each such case the
aggregate amount to which holders of shares of Junior Preferred Stock were
entitled immediately prior to such event under the proviso in clause (1) of the
preceding sentence shall be adjusted by multiplying such amount by a fraction
the numerator of which is the number of shares of Common Stock outstanding
immediately after such event and the denominator of which is the number of
shares of Common Stock that were outstanding immediately prior to such event.

          (6)  Consolidation, Merger, etc. In case the corporation shall enter
into any consolidation, merger, combination or other transaction in which the
shares of Common Stock are exchanged for or changed into other stock or
securities, cash and/or any other property, then in any such case each share of
Junior Preferred Stock shall at the same time be similarly exchanged or changed
into an amount per share, subject to the provision for adjustment 

                                      5.
<PAGE>
 
hereinafter set forth, equal to 100 times the aggregate amount of stock,
securities, cash and/or any other property (payable in kind), as the case may
be, into which or for which each share of Common Stock is changed or exchanged.
In the event the corporation shall at any time declare or pay any dividend on
the Common Stock payable in shares of Common Stock, or effect a subdivision or
combination or consolidation of the outstanding shares of Common Stock (by
reclassification or otherwise than by payment of a dividend in shares of Common
Stock) into a greater or lesser number of shares of Common Stock, then in each
such case the amount set forth in the preceding sentence with respect to the
exchange or change of shares of Junior Preferred Stock shall be adjusted by
multiplying such amount by a fraction, the numerator of which is the number of
shares of Common Stock outstanding immediately after such event and the
denominator of which is the number of shares of Common Stock that were
outstanding immediately prior to such event.

          (7)  No Redemption.  The shares of Junior Preferred Stock shall not be
redeemable.

          (8)  Rank.  The Junior Preferred Stock shall rank, with respect to the
payment of dividends and the distribution of assets, junior to all other series
of the corporation's Preferred Stock.

          (9)  Amendment. The Certificate of Incorporation of the corporation
shall not be amended in any manner which would materially alter or change the
powers, preferences or special rights of the Junior Preferred Stock so as to
affect them adversely without the affirmative vote of the holders of at least
two-thirds of the outstanding shares of Junior Preferred Stock, voting together
as a single class.

                                      V.

     For the management of the business and for the conduct of the affairs of
the corporation, and in further definition, limitation and regulation of the
powers of the corporation, of its directors and of its stockholders or any class
thereof, as the case may be, it is further provided that:

     A.

          (1)  The management of the business and the conduct of the affairs of
the corporation shall be vested in its Board of Directors. The number of
directors which shall constitute the whole Board of Directors shall be fixed
exclusively by one or more resolutions adopted by the Board of Directors.

          (2)  Subject to the rights of the holders of any series of Preferred
Stock to elect additional directors under specified circumstances, the directors
shall be divided into three classes designated as Class I, Class II and Class
III, respectively. Directors shall be assigned to each 

                                      6.
<PAGE>
 
class in accordance with a resolution or resolutions adopted by the Board of
Directors. At the first annual meeting of stockholders following the adoption
and filing of this Certificate of Incorporation, the term of office of the Class
I directors shall expire and Class I directors shall be elected for a full term
of three years. At the second annual meeting of stockholders following the
adoption and filing of this Certificate of Incorporation, the term of office of
the Class II directors shall expire and Class II directors shall be elected for
a full term of three years. At the third annual meeting of stockholders
following the adoption and filing of this Certificate of Incorporation, the term
of office of the Class III directors shall expire and Class III directors shall
be elected for a full term of three years. At each succeeding annual meeting of
stockholders, directors shall be elected for a full term of three years to
succeed the directors of the class whose terms expire at such annual meeting.

     Notwithstanding the foregoing provisions of this Article, each director
shall serve until his or her successor is duly elected and qualified or until
his or her death, resignation or removal.  No decrease in the number of
directors constituting the Board of Directors shall shorten the term of any
incumbent director.

          (3)  Subject to the rights of the holders of any series of Preferred
Stock, no director shall be removed without cause. Subject to any limitations
imposed by law, the Board of Directors or any individual director may be removed
from office at any time with cause by the affirmative vote of the holders of a
majority of the voting power of all the then-outstanding shares of voting stock
of the corporation, entitled to vote at an election of directors (the "Voting
Stock").

          (4)  Subject to the rights of the holders of any series of Preferred
Stock, any vacancies on the Board of Directors resulting from death,
resignation, disqualification, removal or other causes and any newly created
directorships resulting from any increase in the number of directors, shall,
unless the Board of Directors determines by resolution that any such vacancies
or newly created directorships shall be filled by the stockholders, except as
otherwise provided by law, be filled only by the affirmative vote of a majority
of the directors then in office, even though less than a quorum of the Board of
Directors, and not by the stockholders. Any director elected in accordance with
the preceding sentence shall hold office for the remainder of the full term of
the director for which the vacancy was created or occurred and until such
director's successor shall have been elected and qualified.

     B.

          (1)  Subject to paragraph (g) of Section 43 of the Bylaws, the Bylaws
may be altered or amended or new Bylaws adopted by the affirmative vote of at
least sixty-six and two-thirds percent (66-2/3%) of the voting power of all of
the then-outstanding shares of the Voting Stock. The Board of Directors shall
also have the power to adopt, amend, or repeal Bylaws.

                                      7.
<PAGE>
 
          (2)  The directors of the corporation need not be elected by written
ballot unless the Bylaws so provide.

          (3)  No action shall be taken by the stockholders of the corporation
except at an annual or special meeting of stockholders called in accordance with
the Bylaws. No action shall be taken by the stockholders by written consent.

          (4)  Special meetings of the stockholders of the corporation may be
called, for any purpose or purposes, by (i) the Chairman of the Board of
Directors, (ii) the Chief Executive Officer, or (iii) the Board of Directors
pursuant to a resolution adopted by a majority of the total number of authorized
directors (whether or not there exist any vacancies in previously authorized
directorships at the time any such resolution is presented to the Board of
Directors for adoption), and shall be held at such place, on such date, and at
such time as the Board of Directors shall fix.

          (5)  Advance notice of stockholder nominations for the election of
directors and of business to be brought by stockholders before any meeting of
the stockholders of the corporation shall be given in the manner provided in the
Bylaws of the corporation.

                                      VI.

     A.   A director of the corporation shall not be personally liable to the
corporation or its stockholders for monetary damages for any breach of fiduciary
duty as a director, except for liability (i) for any breach of the director's
duty of loyalty to the corporation or its stockholders, (ii) for acts or
omissions not in good faith or which involve intentional misconduct or a knowing
violation of law (iii) under Section 174 of the Delaware General Corporation
Law, or (iv) for any transaction from which the director derived an improper
personal benefit.  If the Delaware General Corporation Law is amended after
approval by the stockholders of this Article to authorize corporate action
further eliminating or limiting the personal liability of directors, then the
liability of a director shall be eliminated or limited to the fullest extent
permitted by the Delaware General corporation Law, as so amended.

     B.   Any repeal or modification of this Article VI shall be prospective and
shall not affect the rights under this Article VI in effect at the time of the
alleged occurrence of any act or omission to act giving rise to liability or
indemnification.

                                     VII.

     A.   The corporation reserves the right to amend, alter, change or repeal
any provision contained in this Certificate of Incorporation, in the manner now
or hereafter prescribed by statute, except as provided in paragraph B. of this
Article VII, and all rights conferred upon the stockholders herein are granted
subject to this reservation.

                                      8.
<PAGE>
 
     B.   Notwithstanding any other provisions of this Certificate of
Incorporation or any provision of law which might otherwise permit a lesser vote
or no vote, but in addition to any affirmative vote of the holders of any
particular class or series of the Voting Stock required by law, this Certificate
of Incorporation or any Preferred Stock Designation, the affirmative vote of the
holders of at least sixty-six and two-thirds percent (66-2/3%) of the voting
power of all of the then-outstanding shares of the Voting Stock, voting together
as a single class, shall be required to alter, amend or repeal Articles V, VI,
and VII.

                                     VIII.

     The name and the mailing address of the Sole Incorporator is as follows:

          Name                      Mailing Address

          Andrei M. Manoliu         Cooley Godward Castro
                                    Huddleson & Tatum
                                    3000 El Camino Real
                                    5 Palo Alto Square
                                    4th Floor
                                    Palo Alto, CA 94306-2155

     In Witness Whereof, this Certificate has been subscribed this 29th day of
August, 1996 by the undersigned who affirms that the statements made herein
are true and correct.


                                    /s/ Andrei M. Manoliu
                                    ------------------------------------------
                                    Andrei M. Manoliu
                                    Sole Incorporator

                                      9.

<PAGE>

                           IGEN INTERNATIONAL, INC. 
                                  EXHIBIT 3.2



                           CERTIFICATE OF DESIGNATION

                                       OF

                 SERIES A JUNIOR PARTICIPATING PREFERRED STOCK

                                       OF

                            IGEN INTERNATIONAL, INC.

                        (Pursuant to Section 151 of the
                       Delaware General Corporation Law)


     IGEN INTERNATIONAL, INC., a corporation organized and existing under the
General Corporation Law of the State of Delaware (hereinafter called the
"Company"), hereby certifies that the following resolution was adopted by the
Board of Directors of the Corporation as required by Section 151 of the General
Corporation Law at a meeting duly called and held on November 2, 1996:

          RESOLVED, that pursuant to the authority granted to and vested in the
     Board of Directors of the Company in accordance with the provisions of its
     Certificate of Incorporation, the Board of Directors hereby creates a
     series of Preferred Stock, par value $.001 per share, of the Company and
     hereby states the designation and number of shares, and fixes the relative
     designations and the powers, preferences and rights, and the
     qualifications, limitations and restrictions thereof (in addition to the
     provisions set forth in the Certificate of Incorporation of the Company,
     which are applicable to the Preferred Stock of all classes and series), as
     follows:

          Series A Junior Participating Preferred Stock:



          SECTION 1.  DESIGNATION AND AMOUNT.  Six Hundred Thousand (600,000)
shares of Preferred Stock, $.001 par value, are designated "Series A Junior
Participating Preferred Stock" with the designations and the powers, preferences
and rights, and the qualifications, limitations and restrictions specified
herein (the "Junior Preferred Stock").  Such number of shares may be increased
or decreased by resolution of the Board of Directors; provided, that no decrease
shall reduce the number of shares of Junior Preferred Stock to a number less
than the number of shares then outstanding plus the number of shares reserved
for issuance upon

                                       1.
<PAGE>
 
the exercise of outstanding options, rights or warrants or upon the conversion
of any outstanding securities issued by the Company convertible into Junior
Preferred Stock.

          SECTION 2.  DIVIDENDS AND DISTRIBUTIONS.

          (A) Subject to the rights of the holders of any shares of any series
     of Preferred Stock (or any similar stock) ranking prior and superior to the
     Junior Preferred Stock with respect to dividends, the holders of shares of
     Junior Preferred Stock, in preference to the holders of Common Stock, par
     value $.001 per share (the "Common Stock"), of the Company, and of any
     other junior stock, shall be entitled to receive, when, as and if declared
     by the Board of Directors out of funds legally available for the purpose,
     quarterly dividends payable in cash on the first day of March, June,
     September and December in each year (each such date being referred to
     herein as a "Quarterly Dividend Payment Date"), commencing on the first
     Quarterly Dividend Payment Date after the first issuance of a share or
     fraction of a share of Junior Preferred Stock, in an amount per share
     (rounded to the nearest cent) equal to the greater of (a) $l.00 or (b)
     subject to the provision for adjustment hereinafter set forth, 100 times
     the aggregate per share amount of all cash dividends, and 100 times the
     aggregate per share amount (payable in kind) of all non-cash dividends or
     other distributions, other than a dividend payable in shares of Common
     Stock or a subdivision of the outstanding shares of Common Stock (by
     reclassification or otherwise) declared on the Common Stock since the
     immediately preceding Quarterly Dividend Payment Date or, with respect to
     the first Quarterly Dividend Payment Date, since the first issuance of any
     share or fraction of a share of Junior Preferred Stock.  In the event the
     Company shall at any time declare or pay any dividend on the Common Stock
     payable in shares of Common Stock, or effect a subdivision or combination
     or consolidation of the outstanding shares of Common Stock (by
     reclassification or otherwise than by payment of a dividend in shares of
     Common Stock) into a greater or lesser number of shares of Common Stock,
     then in each such case the amount to which holders of shares of Junior
     Preferred Stock were entitled immediately prior to such event under clause
     (b) of the preceding sentence shall be adjusted by multiplying such amount
     by a fraction, the numerator of which is the number of shares of Common
     Stock outstanding immediately after such event and the denominator of which
     is the number of shares of Common Stock that were outstanding immediately
     prior to such event.

          (B) The Company shall declare a dividend or distribution on the Junior
     Preferred Stock as provided in paragraph (A) of this Section immediately
     after it declares a dividend or distribution on the Common Stock (other
     than a dividend payable in shares of Common Stock); provided that, in the
     event no dividend or distribution shall have been declared on the Common
     Stock during the period between any Quarterly Dividend Payment Date and the
     next subsequent Quarterly Dividend Payment Date, a dividend of $1.00 per
     share on the Junior Preferred

                                       2.
<PAGE>
 
     Stock shall nevertheless be payable on such subsequent Quarterly Dividend
     Payment Date.

          (C) Dividends shall begin to accrue and be cumulative on outstanding
     shares of Junior Preferred Stock from the Quarterly Dividend Payment Date
     next preceding the date of issue of such shares, unless the date of issue
     of such shares is prior to the record date for the first Quarterly Dividend
     Payment Date, in which case dividends on such shares shall begin to accrue
     from the date of issue of such shares, or unless the date of issue is a
     Quarterly Dividend Payment Date or is a date after the record date for the
     determination of holders of shares of Junior Preferred Stock entitled to
     receive a quarterly dividend and before such Quarterly Dividend Payment
     Date, in either of which events such dividends shall begin to accrue and be
     cumulative from such Quarterly Dividend Payment Date.  Accrued but unpaid
     dividends shall not bear interest.  Dividends paid on the shares of Junior
     Preferred Stock in an amount less than the total amount of such dividends
     at the time accrued and payable on such shares shall be allocated pro rata
     on a share-by-share basis among all such shares at the time outstanding.
     The Board of Directors may fix a record date for the determination of
     holders of shares of Junior Preferred Stock entitled to receive payment of
     a dividend or distribution declared thereon, which record date shall be not
     more than 60 days prior to the date fixed for the payment thereof.

          SECTION 3.  VOTING RIGHTS.  The holders of shares of Junior Preferred
     Stock shall have the following voting rights:

          (A) Subject to the provision for adjustment hereinafter set forth,
     each share of Junior Preferred Stock shall entitle the holder thereof to
     100 votes on all matters submitted to a vote of the stockholders of the
     Company.  In the event the Company shall at any time declare or pay any
     dividend on the Common Stock payable in shares of Common Stock, or effect a
     subdivision or combination or consolidation of the outstanding shares of
     Common Stock (by reclassification or otherwise than by payment of a
     dividend in shares of Common Stock) into a greater or lesser number of
     shares of Common Stock, then in each such case the number of votes per
     share to which holders of shares of Junior Preferred Stock were entitled
     immediately prior to such event shall be adjusted by multiplying such
     number by a fraction, the numerator of which is the number of shares of
     Common Stock outstanding immediately after such event and the denominator
     of which is the number of shares of Common Stock that were outstanding
     immediately prior to such event.

          (B) Except as otherwise provided herein, in any other Certificate of
     Designation creating a series of Preferred Stock or any similar stock, or
     by law, the holders of shares of Junior Preferred Stock and the holders of
     shares of Common Stock and any other capital stock of the Company having
     general voting rights shall vote together as one class on all matters
     submitted to a vote of stockholders of the Company.

                                       3.
<PAGE>
 
     (C) Except as set forth herein, or as otherwise provided by law, holders of
     Junior Preferred Stock shall have no special voting rights and their
     consent shall not be required (except to the extent they are entitled to
     vote with holders of Common Stock as set forth herein) for taking any
     corporate action.

          SECTION 4.  CERTAIN RESTRICTIONS.

          (A) Whenever quarterly dividends or other dividends or distributions
     payable on the Junior Preferred Stock as provided in Section 2 are in
     arrears, thereafter and until all accrued and unpaid dividends and
     distributions, whether or not declared, on shares of Junior Preferred Stock
     outstanding shall have been paid in full, the Company shall not:

               (I) declare or pay dividends, or make any other distributions, on
     any shares of stock ranking junior (either as to dividends or upon
     liquidation, dissolution or winding up) to the Junior Preferred Stock;

               (II) declare or pay dividends, or make any other distributions,
     on any shares of stock ranking on a parity (either as to dividends or upon
     liquidation, dissolution or winding up) with the Junior Preferred Stock,
     except dividends paid ratably on the Junior Preferred Stock and all such
     parity stock on which dividends are payable or in arrears in proportion to
     the total amounts to which the holders of all such shares are then
     entitled;

               (III)  redeem or purchase or otherwise acquire for consideration
     shares of any stock ranking junior (either as to dividends or upon
     liquidation, dissolution or winding up) to the Junior Preferred Stock,
     provided that the Company may at any time redeem, purchase or otherwise
     acquire shares of any such junior stock in exchange for shares of any stock
     of the Company ranking junior (either as to dividends or upon dissolution,
     liquidation or winding up) to the Junior Preferred Stock; or

               (IV) redeem or purchase or otherwise acquire for consideration
     any shares of Junior Preferred Stock, or any shares of stock ranking on a
     parity with the Junior Preferred Stock, except in accordance with a
     purchase offer made in writing or by publication (as determined by the
     Board of Directors) to all holders of such shares upon such terms as the
     Board of Directors, after consideration of the respective annual dividend
     rates and other relative rights and preferences of the respective series
     and classes, shall determine in good faith will result in fair and
     equitable treatment among the respective series or classes.

          (B) The Company shall not permit any subsidiary of the Company to
     purchase or otherwise acquire for consideration any shares of stock of the
     Company unless the Company could, under paragraph (A) of this Section 4,
     purchase or otherwise acquire such shares at such time and in such manner.

                                       4.
<PAGE>
 
          SECTION 5.  REACQUIRED SHARES.  Any shares of Junior Preferred Stock
     purchased or otherwise acquired by the Company in any manner whatsoever
     shall be retired and cancelled promptly after the acquisition thereof.  All
     such shares shall upon their cancellation become authorized but unissued
     shares of Preferred Stock and may be reissued as part of a new series of
     Preferred Stock subject to the conditions and restrictions on issuance set
     forth herein, in the Restated Certificate of Incorporation, or in any other
     Certificate of Designation creating a series of Preferred Stock or any
     similar stock or as otherwise required by law.

          SECTION 6.  LIQUIDATION, DISSOLUTION OR WINDING UP.  Upon any
     liquidation, dissolution or winding up of the Company, no distribution
     shall be made (1) to the holders of shares of stock ranking junior (either
     as to dividends or upon liquidation, dissolution or winding up) to the
     Junior Preferred Stock unless, prior thereto, the holders of shares of
     Junior Preferred Stock shall have received $100 per share, plus an amount
     equal to accrued and unpaid dividends and distributions thereon, whether or
     not declared, to the date of such payment, provided that the holders of
     shares of Junior Preferred Stock shall be entitled to receive an aggregate
     amount per share, subject to the provision for adjustment hereinafter set
     forth, equal to 100 times the aggregate amount to be distributed per share
     to holders of shares of Common Stock, or (2) to the holders of shares of
     stock ranking on a parity (either as to dividends or upon liquidation,
     dissolution or winding up) with the Junior Preferred Stock, except
     distributions made ratably on the Junior Preferred Stock and all such
     parity stock in proportion to the total amounts to which the holders of all
     such shares are entitled upon such liquidation, dissolution or winding up.
     In the event the Company shall at any time declare or pay any dividend on
     the Common Stock payable in shares of Common Stock, or effect a subdivision
     or combination or consolidation of the outstanding shares of Common Stock
     (by reclassification or otherwise than by payment of a dividend in shares
     of Common Stock) into a greater or lesser number of shares of Common Stock,
     then in each such case the aggregate amount to which holders of shares of
     Junior Preferred Stock were entitled immediately prior to such event under
     the proviso in clause (1) of the preceding sentence shall be adjusted by
     multiplying such amount by a fraction the numerator of which is the number
     of shares of Common Stock outstanding immediately after such event and the
     denominator of which is the number of shares of Common Stock that were
     outstanding immediately prior to such event.

          SECTION 7.  CONSOLIDATION, MERGER, ETC.  In case the Company shall
     enter into any consolidation, merger, combination or other transaction in
     which the shares of Common Stock are exchanged for or changed into other
     stock or securities, cash and/or any other property, then in any such case
     each share of Junior Preferred Stock shall at the same time be similarly
     exchanged or changed into an amount per share, subject to the provision for
     adjustment hereinafter set forth, equal to 100 times the aggregate amount
     of stock, securities, cash and/or any other property (payable in kind), as
     the case may be, into which or for which each share of Common Stock is
     changed or exchanged.  In the event the

                                       5.
<PAGE>
 
     Company shall at any time declare or pay any dividend on the Common Stock
     payable in shares of Common Stock, or effect a subdivision or combination
     or consolidation of the outstanding shares of Common Stock (by
     reclassification or otherwise than by payment of a dividend in shares of
     Common Stock) into a greater or lesser number of shares of Common Stock,
     then in each such case the amount set forth in the preceding sentence with
     respect to the exchange or change of shares of Junior Preferred Stock shall
     be adjusted by multiplying such amount by a fraction, the numerator of
     which is the number of shares of Common Stock outstanding immediately after
     such event and the denominator of which is the number of shares of Common
     Stock that were outstanding immediately prior to such event.

          SECTION 8.  NO REDEMPTION.  The shares of Junior Preferred Stock shall
     not be redeemable.

          SECTION 9.  RANK.  The Junior Preferred Stock shall rank, with respect
     to the payment of dividends and the distribution of assets, junior to all
     series of any other class of the Company's Preferred Stock.

          SECTION 10.  AMENDMENT.  The Certificate of Incorporation of the
     Company shall not be amended in any manner which would materially alter or
     change the powers, preferences or special rights of the Junior Preferred
     Stock so as to affect them adversely without the affirmative vote of the
     holders of at least two-thirds of the outstanding shares of Junior
     Preferred Stock, voting together as a single class.

     IN WITNESS WHEREOF, the undersigned have executed this certificate as of
November 2, 1996.


                              /s/ Richard J. Massey 
                              -----------------------------------------
                              RICHARD J. MASSEY, PH.D.
                              President and Chief Operating Officer



                              /s/ Andrei M. Manoliu
                              -----------------------------------------
                              ANDREI M. MANOLIU
                              Secretary

                                       6.

<PAGE>
 
                            IGEN INTERNATIONAL INC.
                                  EXHIBIT 3.3

                                    BYLAWS

                                      OF

                           IGEN INTERNATIONAL, INC.

                           (A DELAWARE CORPORATION)



                                   Article I

                                    Offices

     Section 1.    Registered Office. The registered office of the corporation
in the State of Delaware shall be in the City of Wilmington, County of New
Castle.

     Section 2.    Other Offices. The corporation shall also have and maintain
an office or principal place of business at such place as may be fixed by the
Board of Directors, and may also have offices at such other places, both within
and without the State of Delaware as the Board of Directors may from time to
time determine or the business of the corporation may require.


                                  Article II

                                Corporate Seal

     Section 3.     Corporate Seal. The corporate seal shall consist of a die
bearing the name of the corporation and the inscription, "Corporate Seal-
Delaware." Said seal may be used by causing it or a facsimile thereof to be
impressed or affixed or reproduced or otherwise.


                                  Article III

                            Stockholders' Meetings

     Section 4.     Place of Meetings. Meetings of the stockholders of the
corporation shall be held at such place, either within or without the State of
Delaware, as may be designated from time to time by the Board of Directors, or,
if not so designated, then at the office of the corporation required to be
maintained pursuant to Section 2 hereof.

<PAGE>
 
     Section 5.     Annual Meeting.

       (b)  The annual meeting of the stockholders of the corporation, for the
purpose of election of directors and for such other business as may lawfully
come before it, shall be held on such date and at such time as may be designated
from time to time by the Board of Directors.

       (b)  At an annual meeting of the stockholders, only such business shall
be conducted as shall have been properly brought before the meeting.  To be
properly brought before an annual meeting, business must be:  (A) specified in
the notice of meeting (or any supplement thereto) given by or at the direction
of the Board of Directors, (B) otherwise properly brought before the meeting by
or at the direction of the Board of Directors, or (C) otherwise properly brought
before the meeting by a stockholder.  For business to be properly brought before
an annual meeting by a stockholder, the stockholder must have given timely
notice thereof in writing to the Secretary of the corporation.  To be timely, a
stockholder's notice must be delivered to or mailed and received at the
principal executive offices of the corporation not later than the close of
business one hundred twenty (120) calendar days prior to the date of the
corporation's proxy statement released to stockholders in connection with the
preceding year's annual meeting of stockholders; provided, however, that in the
event that no annual meeting was held in the previous year or the date of the
annual meeting has been changed by more than thirty (30) days from the date
contemplated at the time of the previous year's proxy statement, notice by the
stockholder to be timely must be so received not earlier than the close of
business on the ninetieth (90th) day prior to such annual meeting and not later
than the close of business on the later of the sixtieth (60th) day prior to such
annual meeting or, in the event public announcement of the date of such annual
meeting is first made by the corporation fewer than seventy (70) days prior to
the date of such annual meeting, the close of business on the tenth (10th) day
following the day on which public announcement of the date of such meeting is
first made by the corporation. A stockholder's notice to the Secretary shall set
forth as to each matter the stockholder proposes to bring before the annual
meeting:  (i) a brief description of the business desired to be brought before
the annual meeting and the reasons for conducting such business at the annual
meeting, (ii) the name and address, as they appear on the corporation's books,
of the stockholder proposing such business, (iii) the class and number of shares
of the corporation which are beneficially owned by the stockholder, (iv) any
material interest of the stockholder in such business and (v) any other
information that is required to be provided by the stockholder pursuant to
Regulation 14A under the Securities Exchange Act of 1934, as amended (the "1934
Act"), in his capacity as a proponent to a stockholder proposal.
Notwithstanding the foregoing, in order to include information with respect to a
stockholder proposal in the proxy statement and form of proxy for a
stockholder's meeting, stockholders must provide notice as required by the
regulations promulgated under the 1934 Act.  Notwithstanding anything in these
Bylaws to the contrary, no business shall be conducted at any annual meeting
except in accordance with the procedures set forth in this paragraph (b).  The
chairman of the annual meeting shall, if the facts warrant, determine and
declare at the meeting that business was not properly brought before the meeting
and in accordance with the provisions of this paragraph (b), and, if he should
so 


                                      2.
<PAGE>
 
determine, he shall so declare at the meeting that any such business not
properly brought before the meeting shall not be transacted.  (Del. Code Ann.,
tit. 8: (S) 211(b))

       (c)  Only persons who are nominated in accordance with the procedures set
forth in this paragraph (c) shall be eligible for election as directors.
Nominations of persons for election to the Board of Directors of the corporation
may be made at a meeting of stockholders by or at the direction of the Board of
Directors or by any stockholder of the corporation entitled to vote in the
election of directors at the meeting who complies with the notice procedures set
forth in this paragraph (c).  Such nominations, other than those made by or at
the direction of the Board of Directors, shall be made pursuant to timely notice
in writing to the Secretary of the corporation in accordance with the provisions
of paragraph (b) of this Section 5.  Such stockholder's notice shall set forth
(i) as to each person, if any, whom the stockholder proposes to nominate for
election or re-election as a director:  (A) the name, age, business address and
residence address of such person, (B) the principal occupation or employment of
such person, (C) the class and number of shares of the corporation which are
beneficially owned by such person, (D) a description of all arrangements or
understandings between the stockholder and each nominee and any other person or
persons (naming such person or persons) pursuant to which the nominations are to
be made by the stockholder, and (E) any other information relating to such
person that is required to be disclosed in solicitations of proxies for election
of directors, or is otherwise required, in each case pursuant to Regulation 14A
under the 1934 Act (including without limitation such person's written consent
to being named in the proxy statement, if any, as a nominee and to serving as a
director if elected); and (ii) as to such stockholder giving notice, the
information required to be provided pursuant to paragraph (b) of this Section 5.
At the request of the Board of Directors, any person nominated by a stockholder
for election as a director shall furnish to the Secretary of the corporation
that information required to be set forth in the stockholder's notice of
nomination which pertains to the nominee.  No person shall be eligible for
election as a director of the corporation unless nominated in accordance with
the procedures set forth in this paragraph (c).  The chairman of the meeting
shall, if the facts warrant, determine and declare at the meeting that a
nomination was not made in accordance with the procedures prescribed by these
Bylaws, and if he should so determine, he shall so declare at the meeting, and
the defective nomination shall be disregarded.

       (d)  For purposes of this Section 5, "public announcement" shall mean
disclosure in a press release reported by the Dow Jones News Service, Associated
Press or comparable national news service or in a document publicly filed by the
corporation with the Securities and Exchange Commission pursuant to Section 13,
14 or 15(d) of the Exchange Act.



                                      3.
<PAGE>
 
     Section 6.     Special Meetings.

       (a)  Special meetings of the stockholders of the corporation may be
called, for any purpose or purposes, by (i) the Chairman of the Board of
Directors, (ii) the Chief Executive Officer, or (iii) the Board of Directors
pursuant to a resolution adopted by a majority of the total number of authorized
directors (whether or not there exist any vacancies in previously authorized
directorships at the time any such resolution is presented to the Board of
Directors for adoption), and shall be held at such place, on such date, and at
such time as the Board of Directors, shall fix.

       (b)  If a special meeting is called by any person or persons other than
the Board of Directors, the request shall be in writing, specifying the general
nature of the business proposed to be transacted, and shall be delivered
personally or sent by registered mail or by telegraphic or other facsimile
transmission to the Chairman of the Board of Directors, the Chief Executive
Officer, or the Secretary of the corporation. No business may be transacted at
such special meeting otherwise than specified in such notice. The Board of
Directors shall determine the time and place of such special meeting, which
shall be held not less than thirty-five (35) nor more than one hundred twenty
(120) days after the date of the receipt of the request. Upon determination of
the time and place of the meeting, the officer receiving the request shall cause
notice to be given to the stockholders entitled to vote, in accordance with the
provisions of Section 7 of these Bylaws. If the notice is not given within sixty
(60) days after the receipt of the request, the person or persons requesting the
meeting may set the time and place of the meeting and give the notice. Nothing
contained in this paragraph (b) shall be construed as limiting, fixing, or
affecting the time when a meeting of stockholders called by action of the Board
of Directors may be held.

     Section 7.     Notice of Meetings.  Except as otherwise provided by law or
the Certificate of Incorporation, written notice of each meeting of stockholders
shall be given not less than ten (10) nor more than sixty (60) days before the
date of the meeting to each stockholder entitled to vote at such meeting, such
notice to specify the place, date and hour and purpose or purposes of the
meeting. Notice of the time, place and purpose of any meeting of stockholders
may be waived in writing, signed by the person entitled to notice thereof,
either before or after such meeting, and will be waived by any stockholder by
his attendance thereat in person or by proxy, except when the stockholder
attends a meeting for the express purpose of objecting, at the beginning of the
meeting, to the transaction of any business because the meeting is not lawfully
called or convened. Any stockholder so waiving notice of such meeting shall be
bound by the proceedings of any such meeting in all respects as if due notice
thereof had been given.

     Section 8.     Quorum.  At all meetings of stockholders, except where
otherwise provided by statute or by the Certificate of Incorporation, or by
these Bylaws, the presence, in person or by proxy duly authorized, of the
holders of a majority of the outstanding shares of stock entitled to vote shall
constitute a quorum for the transaction of business. In the absence of a quorum,
any meeting of stockholders may be adjourned, from time to time, either by the

                                      4.
<PAGE>
 
chairman of the meeting or by vote of the holders of a majority of the shares
represented thereat, but no other business shall be transacted at such meeting.
The stockholders present at a duly called or convened meeting, at which a quorum
is present, may continue to transact business until adjournment, notwithstanding
the withdrawal of enough stockholders to leave less than a quorum. Except as
otherwise provided by law, the Certificate of Incorporation or these Bylaws, all
action taken by the holders of a majority of the vote cast, excluding
abstentions, at any meeting at which a quorum is present shall be valid and
binding upon the corporation; provided, however, that directors shall be elected
by a plurality of the votes of the shares present in person or represented by
proxy at the meeting and entitled to vote on the election of directors. Where a
separate vote by a class or classes or series is required, except where
otherwise provided by the statute or by the Certificate of Incorporation or
these Bylaws, a majority of the outstanding shares of such class or classes or
series, present in person or represented by proxy, shall constitute a quorum
entitled to take action with respect to that vote on that matter and, except
where otherwise provided by the statute or by the Certificate of Incorporation
or these Bylaws, the affirmative vote of the majority (plurality, in the case of
the election of directors) of the votes cast, including abstentions, by the
holders of shares of such class or classes or series shall be the act of such
class or classes or series.

     Section 9.     Adjournment and Notice of Adjourned Meetings.  Any meeting
of stockholders, whether annual or special, may be adjourned from time to time
either by the chairman of the meeting or by the vote of a majority of the shares
casting votes, excluding abstentions. When a meeting is adjourned to another
time or place, notice need not be given of the adjourned meeting if the time and
place thereof are announced at the meeting at which the adjournment is taken. At
the adjourned meeting, the corporation may transact any business which might
have been transacted at the original meeting. If the adjournment is for more
than thirty (30) days or if after the adjournment a new record date is fixed for
the adjourned meeting, a notice of the adjourned meeting shall be given to each
stockholder of record entitled to vote at the meeting.

     Section 10.    Voting Rights.  For the purpose of determining those
stockholders entitled to vote at any meeting of the stockholders, except as
otherwise provided by law, only persons in whose names shares stand on the stock
records of the corporation on the record date, as provided in Section 12 of
these Bylaws, shall be entitled to vote at any meeting of stockholders. Every
person entitled to vote shall have the right to do so either in person or by an
agent or agents authorized by a proxy granted in accordance with Delaware law.
An agent so appointed need not be a stockholder. No proxy shall be voted after
three (3) years from its date of creation unless the proxy provides for a longer
period.

     Section 11.    Joint Owners of Stock.  If shares or other securities having
voting power stand of record in the names of two (2) or more persons, whether
fiduciaries, members of a partnership, joint tenants, tenants in common, tenants
by the entirety, or otherwise, or if two (2) or more persons have the same
fiduciary relationship respecting the same shares, unless the Secretary is given
written notice to the contrary and is furnished with a copy of the instrument or



                                      5.
<PAGE>
 
order appointing them or creating the relationship wherein it is so provided,
their acts with respect to voting shall have the following effect:  (a) if only
one (1) votes, his act binds all; (b) if more than one (1) votes, the act of the
majority so voting binds all; (c) if more than one (1) votes, but the vote is
evenly split on any particular matter, each faction may vote the securities in
question proportionally, or may apply to the Delaware Court of Chancery for
relief as provided in the General Corporation Law of Delaware, Section 217(b).
If the instrument filed with the Secretary shows that any such tenancy is held
in unequal interests, a majority or even-split for the purpose of subsection (c)
shall be a majority or even-split in interest.

     Section 12.    List of Stockholders.  The Secretary shall prepare and make,
at least ten (10) days before every meeting of stockholders, a complete list of
the stockholders entitled to vote at said meeting, arranged in alphabetical
order, showing the address of each stockholder and the number of shares
registered in the name of each stockholder. Such list shall be open to the
examination of any stockholder, for any purpose germane to the meeting, during
ordinary business hours, for a period of at least ten (10) days prior to the
meeting, either at a place within the city where the meeting is to be held,
which place shall be specified in the notice of the meeting, or, if not
specified, at the place where the meeting is to be held. The list shall be
produced and kept at the time and place of meeting during the whole time thereof
and may be inspected by any stockholder who is present.

     Section 13.    Action Without Meeting.  No action shall be taken by the
stockholders except at an annual or special meeting of stockholders called in
accordance with these Bylaws, and no action shall be taken by the stockholders
by written consent.

     Section 14.    Organization.

       (a)  At every meeting of stockholders, the Chairman of the Board of
Directors, or, if a Chairman has not been appointed or is absent, the President,
or, if the President is absent, a chairman of the meeting chosen by a majority
in interest of the stockholders entitled to vote, present in person or by proxy,
shall act as chairman.  The Secretary, or, in his absence, an Assistant
Secretary directed to do so by the President, shall act as secretary of the
meeting.

       (b)  The Board of Directors of the corporation shall be entitled to make
such rules or regulations for the conduct of meetings of stockholders as it
shall deem necessary, appropriate or convenient.  Subject to such rules and
regulations of the Board of Directors, if any, the chairman of the meeting shall
have the right and authority to prescribe such rules, regulations and procedures
and to do all such acts as, in the judgment of such chairman, are necessary,
appropriate or convenient for the proper conduct of the meeting, including,
without limitation, establishing an agenda or order of business for the meeting,
rules and procedures for maintaining order at the meeting and the safety of
those present, limitations on participation in such meeting to stockholders of
record of the corporation and their duly authorized and constituted proxies and
such other persons as the chairman shall permit, restrictions on entry to the
meeting after the time fixed for the commencement thereof, limitations on the
time allotted to 



                                      6.
<PAGE>
 
questions or comments by participants and regulation of the opening and closing
of the polls for balloting on matters which are to be voted on by ballot. Unless
and to the extent determined by the Board of Directors or the chairman of the
meeting, meetings of stockholders shall not be required to be held in accordance
with rules of parliamentary procedure.

                                  Article IV

                                   Directors

     Section 15.    Number and Term of Office.  The authorized number of
directors of the corporation shall be fixed in accordance with the Certificate
of Incorporation. Directors need not be stockholders unless so required by the
Certificate of Incorporation. If for any cause, the directors shall not have
been elected at an annual meeting, they may be elected as soon thereafter as
convenient at a special meeting of the stockholders called for that purpose in
the manner provided in these Bylaws.

     Section 16.    Powers.  The powers of the corporation shall be exercised,
its business conducted and its property controlled by the Board of Directors,
except as may be otherwise provided by statute or by the Certificate of
Incorporation.

     Section 17.    Classes of Directors.

       Subject to the rights of the holders of any series of Preferred Stock to
elect additional directors under specified circumstances, the directors shall be
divided into three classes designated as Class I, Class II and Class III,
respectively. Directors shall be assigned to each class in accordance with a
resolution or resolutions adopted by the Board of Directors. At the first annual
meeting of stockholders following the adoption and filing of this Certificate of
Incorporation, the term of office of the Class I directors shall expire and
Class I directors shall be elected for a full term of three years. At the second
annual meeting of stockholders following the adoption and filing of this
Certificate of Incorporation, the term of office of the Class II directors shall
expire and Class II directors shall be elected for a full term of three years.
At the third annual meeting of stockholders following the adoption and filing of
this Certificate of Incorporation, the term of office of the Class III directors
shall expire and Class III directors shall be elected for a full term of three
years. At each succeeding annual meeting of stockholders, directors shall be
elected for a full term of three years to succeed the directors of the class
whose terms expire at such annual meeting.

     Notwithstanding the foregoing provisions of this Article, each director
shall serve until his successor is duly elected and qualified or until his
death, resignation or removal.  No decrease in the number of directors
constituting the Board of Directors shall shorten the term of any incumbent
director.




                                      7.
<PAGE>
 
     Section 18.    Vacancies.  Unless otherwise provided in the Certificate of
Incorporation, any vacancies on the Board of Directors resulting from death,
resignation, disqualification, removal or other causes and any newly created
directorships resulting from any increase in the number of directors, shall
unless the Board of Directors determines by resolution that any such vacancies
or newly created directorships shall be filled by stockholders, be filled only
by the affirmative vote of a majority of the directors then in office, even
though less than a quorum of the Board of Directors.  Any director elected in
accordance with the preceding sentence shall hold office for the remainder of
the full term of the director for which the vacancy was created or occurred and
until such director's successor shall have been elected and qualified.  A
vacancy in the Board of Directors shall be deemed to exist under this Bylaw in
the case of the death, removal or resignation of any director.

     Section 19.    Resignation.  Any director may resign at any time by
delivering his written resignation to the Secretary, such resignation to specify
whether it will be effective at a particular time, upon receipt by the Secretary
or at the pleasure of the Board of Directors. If no such specification is made,
it shall be deemed effective at the pleasure of the Board of Directors. When one
or more directors shall resign from the Board of Directors, effective at a
future date, a majority of the directors then in office, including those who
have so resigned, shall have power to fill such vacancy or vacancies, the vote
thereon to take effect when such resignation or resignations shall become
effective, and each Director so chosen shall hold office for the unexpired
portion of the term of the Director whose place shall be vacated and until his
successor shall have been duly elected and qualified.

     Section 20.    Removal.  Subject to the rights of the holders of any series
of Preferred Stock, no director shall be removed without cause. Subject to any
limitations imposed by law, the Board of Directors or any individual director
may be removed from office at any time with cause by the affirmative vote of the
holders of a majority of the voting power of all the then-outstanding shares of
voting stock of the corporation, entitled to vote at an election of directors
(the "Voting Stock").

     Section 21.    Meetings.

       (a)  Annual Meetings.  The annual meeting of the Board of Directors shall
be held immediately before or after the annual meeting of stockholders and at
the place where such meeting is held.  No notice of an annual meeting of the
Board of Directors shall be necessary and such meeting shall be held for the
purpose of electing officers and transacting such other business as may lawfully
come before it.

       (b)  Regular Meetings.  Except as hereinafter otherwise provided, regular
meetings of the Board of Directors shall be held in the office of the
corporation required to be maintained pursuant to Section 2 hereof.  Unless
otherwise restricted by the Certificate of Incorporation, regular meetings of
the Board of Directors may also be held at any place within or 




                                      8.
<PAGE>
 
without the State of Delaware which has been designated by resolution of the
Board of Directors or the written consent of all directors.

       (c)  Special Meetings.  Unless otherwise restricted by the Certificate of
Incorporation, special meetings of the Board of Directors may be held at any
time and place within or without the State of Delaware whenever called by the
Chairman of the Board, the President or any two of the directors.

       (d)  Telephone Meetings.  Any member of the Board of Directors, or of any
committee thereof, may participate in a meeting by means of conference telephone
or similar communications equipment by means of which all persons participating
in the meeting can hear each other, and participation in a meeting by such means
shall constitute presence in person at such meeting.

       (e)  Notice of Meetings.  Notice of the time and place of all special
meetings of the Board of Directors shall be orally or in writing, by telephone,
facsimile, telegraph or telex, during normal business hours, at least twenty-
four (24) hours before the date and time of the meeting, or sent in writing to
each director by first class mail, charges prepaid, at least three (3) days
before the date of the meeting.  Notice of any meeting may be waived in writing
at any time before or after the meeting and will be waived by any director by
attendance thereat, except when the director attends the meeting for the express
purpose of objecting, at the beginning of the meeting, to the transaction of any
business because the meeting is not lawfully called or convened.

       (f)  Waiver of Notice.  The transaction of all business at any meeting of
the Board of Directors, or any committee thereof, however called or noticed, or
wherever held, shall be as valid as though had at a meeting duly held after
regular call and notice, if a quorum be present and if, either before or after
the meeting, each of the directors not present shall sign a written waiver of
notice.  All such waivers shall be filed with the corporate records or made a
part of the minutes of the meeting.

     Section 22.    Quorum and Voting.

       (a)  Unless the Certificate of Incorporation requires a greater number
and except with respect to indemnification questions arising under Section 43
hereof, for which a quorum shall be one-third of the exact number of directors
fixed from time to time in accordance with the Certificate of Incorporation, a
quorum of the Board of Directors shall consist of a majority of the exact number
of directors fixed from time to time by the Board of Directors in accordance
with the Certificate of Incorporation; provided, however, at any meeting whether
a quorum be present or otherwise, a majority of the directors present may
adjourn from time to time until the time fixed for the next regular meeting of
the Board of Directors, without notice other than by announcement at the
meeting.




                                       9
<PAGE>
 
       (b)  At each meeting of the Board of Directors at which a quorum is
present, all questions and business shall be determined by the affirmative vote
of a majority of the directors present, unless a different vote be required by
law, the Certificate of Incorporation or these Bylaws.

     Section 23.    Action Without Meeting.  Unless otherwise restricted by the
Certificate of Incorporation or these Bylaws, any action required or permitted
to be taken at any meeting of the Board of Directors or of any committee thereof
may be taken without a meeting, if all members of the Board of Directors or
committee, as the case may be, consent thereto in writing, and such writing or
writings are filed with the minutes of proceedings of the Board of Directors or
committee.

     Section 24.    Fees and Compensation.  Directors shall be entitled to such
compensation for their services as may be approved by the Board of Directors,
including, if so approved, by resolution of the Board of Directors, a fixed sum
and expenses of attendance, if any, for attendance at each regular or special
meeting of the Board of Directors and at any meeting of a committee of the Board
of Directors.  Nothing herein contained shall be construed to preclude any
director from serving the corporation in any other capacity as an officer,
agent, employee, or otherwise and receiving compensation therefor.



     Section 25.    Committees.

       (a)  Executive Committee.  The Board of Directors may by resolution
passed by a majority of the whole Board of Directors appoint an Executive
Committee to consist of one (1) or more members of the Board of Directors. The
Executive Committee, to the extent permitted by law and provided in the
resolution of the Board of Directors shall have and may exercise all the powers
and authority of the Board of Directors in the management of the business and
affairs of the corporation, including without limitation the power or authority
to declare a dividend, to authorize the issuance of stock and to adopt a
certificate of ownership and merger, and may authorize the seal of the
corporation to be affixed to all papers which may require it; but no such
committee shall have the power or authority in reference to amending the
Certificate of Incorporation (except that a committee may, to the extent
authorized in the resolution or resolutions providing for the issuance of shares
of stock adopted by the Board of Directors fix the designations and any of the
preferences or rights of such shares relating to dividends, redemption,
dissolution, any distribution of assets of the corporation or the conversion
into, or the exchange of such shares for, shares of any other class or classes
or any other series of the same or any other class or classes of stock of the
corporation or fix the number of shares of any series of stock or authorize the
increase or decrease of the shares of any series), adopting an agreement of
merger or consolidation, recommending to the stockholders the sale, lease or
exchange of all or substantially all of the corporation's property and assets,
recommending to the




                                      10.
<PAGE>
 
stockholders a dissolution of the corporation or a revocation of a dissolution,
or amending the bylaws of the corporation.

       (b)  Other Committees.  The Board of Directors may, by resolution passed
by a majority of the whole Board of Directors, from time to time appoint such
other committees as may be permitted by law. Such other committees appointed by
the Board of Directors shall consist of one (1) or more members of the Board of
Directors and shall have such powers and perform such duties as may be
prescribed by the resolution or resolutions creating such committees, but in no
event shall such committee have the powers denied to the Executive Committee in
these Bylaws.

       (c)  Term.  Each member of a committee of the Board of Directors shall
serve a term on the committee coexistent with such member's term on the Board of
Directors.  The Board of Directors, subject to the provisions of subsections (a)
or (b) of this Bylaw may at any time increase or decrease the number of members
of a committee or terminate the existence of a committee.  The membership of a
committee member shall terminate on the date of his death or voluntary
resignation from the committee or from the Board of Directors.  The Board of
Directors may at any time for any reason remove any individual committee member
and the Board of Directors may fill any committee vacancy created by death,
resignation, removal or increase in the number of members of the committee.  The
Board of Directors may designate one or more directors as alternate members of
any committee, who may replace any absent or disqualified member at any meeting
of the committee, and, in addition, in the absence or disqualification of any
member of a committee, the member or members thereof present at any meeting and
not disqualified from voting, whether or not he or they constitute a quorum, may
unanimously appoint another member of the Board of Directors to act at the
meeting in the place of any such absent or disqualified member.

       (d)  Meetings.  Unless the Board of Directors shall otherwise provide,
regular meetings of the Executive Committee or any other committee appointed
pursuant to this Section 25 shall be held at such times and places as are
determined by the Board of Directors, or by any such committee, and when notice
thereof has been given to each member of such committee, no further notice of
such regular meetings need be given thereafter.  Special meetings of any such
committee may be held at any place which has been determined from time to time
by such committee, and may be called by any director who is a member of such
committee, upon written notice to the members of such committee of the time and
place of such special meeting given in the manner provided for the giving of
written notice to members of the Board of Directors of the time and place of
special meetings of the Board of Directors.  Notice of any special meeting of
any committee may be waived in writing at any time before or after the meeting
and will be waived by any director by attendance thereat, except when the
director attends such special meeting for the express purpose of objecting, at
the beginning of the meeting, to the transaction of any business because the
meeting is not lawfully called or convened.  A majority of the authorized number
of members of any such committee shall 




                                      11.
 
<PAGE>
 
constitute a quorum for the transaction of business, and the act of a majority
of those present at any meeting at which a quorum is present shall be the act of
such committee.

     Section 26.    Organization. At every meeting of the directors, the
Chairman of the Board of Directors, or, if a Chairman has not been appointed or
is absent, the President, or if the President is absent, the most senior Vice
President, or, in the absence of any such officer, a chairman of the meeting
chosen by a majority of the directors present, shall preside over the meeting.
The Secretary, or in his absence, an Assistant Secretary directed to do so by
the President, shall act as secretary of the meeting.


                                   Article V

                                   Officers

     Section 27.    Officers Designated. The officers of the corporation shall
include, if and when designated by the Board of Directors, the Chairman of the
Board of Directors, the Chief Executive Officer, the President, one or more Vice
Presidents, the Secretary, the Chief Financial Officer, the Treasurer, the
Controller, all of whom shall be elected at the annual organizational meeting of
the Board of Directors. The Board of Directors may also appoint one or more
Assistant Secretaries, Assistant Treasurers, Assistant Controllers and such
other officers and agents with such powers and duties as it shall deem
necessary. The Board of Directors may assign such additional titles to one or
more of the officers as it shall deem appropriate. Any one person may hold any
number of offices of the corporation at any one time unless specifically
prohibited therefrom by law. The salaries and other compensation of the officers
of the corporation shall be fixed by or in the manner designated by the Board of
Directors.

     Section 28.    Tenure and Duties of Officers.

       (a)  General.  All officers shall hold office at the pleasure of the
Board of Directors and until their successors shall have been duly elected and
qualified, unless sooner removed. Any officer elected or appointed by the Board
of Directors may be removed at any time by the Board of Directors. If the office
of any officer becomes vacant for any reason, the vacancy may be filled by the
Board of Directors.

       (b)  Duties of Chairman of the Board of Directors.  The Chairman of the
Board of Directors, when present, shall preside at all meetings of the
stockholders and the Board of Directors.  The Chairman of the Board of Directors
shall perform other duties commonly incident to his office and shall also
perform such other duties and have such other powers as the Board of Directors
shall designate from time to time.  If there is no President, then the Chairman
of the Board of Directors shall also serve as the Chief Executive Officer of the
corporation and shall have the powers and duties prescribed in paragraph (c) of
this Section 28.





                                      12.
<PAGE>
 
       (c)  Duties of President.  The President shall preside at all meetings of
the stockholders and at all meetings of the Board of Directors, unless the
Chairman of the Board of Directors has been appointed and is present.  Unless
some other officer has been elected Chief Executive Officer of the corporation,
the President shall be the chief executive officer of the corporation and shall,
subject to the control of the Board of Directors, have general supervision,
direction and control of the business and officers of the corporation.  The
President shall perform other duties commonly incident to his office and shall
also perform such other duties and have such other powers as the Board of
Directors shall designate from time to time.

       (d)  Duties of Vice Presidents.  The Vice Presidents may assume and
perform the duties of the President in the absence or disability of the
President or whenever the office of President is vacant. The Vice Presidents
shall perform other duties commonly incident to their office and shall also
perform such other duties and have such other powers as the Board of Directors
or the President shall designate from time to time.

       (e)  Duties of Secretary.  The Secretary shall attend all meetings of the
stockholders and of the Board of Directors and shall record all acts and
proceedings thereof in the minute book of the corporation.  The Secretary shall
give notice in conformity with these Bylaws of all meetings of the stockholders
and of all meetings of the Board of Directors and any committee thereof
requiring notice.  The Secretary shall perform all other duties given him in
these Bylaws and other duties commonly incident to his office and shall also
perform such other duties and have such other powers as the Board of Directors
shall designate from time to time.  The President may direct any Assistant
Secretary to assume and perform the duties of the Secretary in the absence or
disability of the Secretary, and each Assistant Secretary shall perform other
duties commonly incident to his office and shall also perform such other duties
and have such other powers as the Board of Directors or the President shall
designate from time to time.

       (f)  Duties of Chief Financial Officer.  The Chief Financial Officer
shall keep or cause to be kept the books of account of the corporation in a
thorough and proper manner and shall render statements of the financial affairs
of the corporation in such form and as often as required by the Board of
Directors or the President. The Chief Financial Officer, subject to the order of
the Board of Directors, shall have the custody of all funds and securities of
the corporation. The Chief Financial Officer shall perform other duties commonly
incident to his office and shall also perform such other duties and have such
other powers as the Board of Directors or the President shall designate from
time to time. The President may direct the Treasurer or any Assistant Treasurer,
or the Controller or any Assistant Controller to assume and perform the duties
of the Chief Financial Officer in the absence or disability of the Chief
Financial Officer, and each Treasurer and Assistant Treasurer and each
Controller and Assistant Controller shall perform other duties commonly incident
to his office and shall also perform such other duties and have such other
powers as the Board of Directors or the President shall designate from time to
time.



                                      
                                      13.
<PAGE>
 
     Section 29.    Delegation of Authority. The Board of Directors may from
time to time delegate the powers or duties of any officer to any other officer
or agent, notwithstanding any provision hereof.

     Section 30.    Resignations. Any officer may resign at any time by giving
written notice to the Board of Directors or to the President or to the
Secretary. Any such resignation shall be effective when received by the person
or persons to whom such notice is given, unless a later time is specified
therein, in which event the resignation shall become effective at such later
time. Unless otherwise specified in such notice, the acceptance of any such
resignation shall not be necessary to make it effective. Any resignation shall
be without prejudice to the rights, if any, of the corporation under any
contract with the resigning officer.

     Section 31.    Removal. Any officer may be removed from office at any time,
either with or without cause, by the affirmative vote of a majority of the
directors in office at the time, or by the unanimous written consent of the
directors in office at the time, or by any committee or superior officers upon
whom such power of removal may have been conferred by the Board of Directors.

                                  Article VI

                 Execution Of Corporate Instruments And Voting
                    Of Securities Owned By The Corporation

     Section 32.    Execution of Corporate Instruments. The Board of Directors
may, in its discretion, determine the method and designate the signatory officer
or officers, or other person or persons, to execute on behalf of the corporation
any corporate instrument or document, or to sign on behalf of the corporation
the corporate name without limitation, or to enter into contracts on behalf of
the corporation, except where otherwise provided by law or these Bylaws, and
such execution or signature shall be binding upon the corporation.

     Unless otherwise specifically determined by the Board of Directors or
otherwise required by law, promissory notes, deeds of trust, mortgages and other
evidences of indebtedness of the corporation, and other corporate instruments or
documents requiring the corporate seal, and certificates of shares of stock
owned by the corporation, shall be executed, signed or endorsed by the Chairman
of the Board of Directors, or the President or any Vice President, and by the
Secretary or Treasurer or any Assistant Secretary or Assistant Treasurer.  All
other instruments and documents requiring the corporate signature, but not
requiring the corporate seal, may be executed as aforesaid or in such other
manner as may be directed by the Board of Directors.

     All checks and drafts drawn on banks or other depositaries on funds to the
credit of the corporation or in special accounts of the corporation shall be
signed by such person or persons as the Board of Directors shall authorize so to
do.





                                      14.
<PAGE>
 
     Unless authorized or ratified by the Board of Directors or within the
agency power of an officer, no officer, agent or employee shall have any power
or authority to bind the corporation by any contract or engagement or to pledge
its credit or to render it liable for any purpose or for any amount.

     Section 33.    Voting of Securities Owned by the Corporation. All stock and
other securities of other corporations owned or held by the corporation for
itself, or for other parties in any capacity, shall be voted, and all proxies
with respect thereto shall be executed, by the person authorized so to do by
resolution of the Board of Directors, or, in the absence of such authorization,
by the Chairman of the Board of Directors, the Chief Executive Officer, the
President, or any Vice President.


                                  Article VII

                                Shares Of Stock

     Section 34.    Form and Execution of Certificates. Certificates for the
shares of stock of the corporation shall be in such form as is consistent with
the Certificate of Incorporation and applicable law. Every holder of stock in
the corporation shall be entitled to have a certificate signed by or in the name
of the corporation by the Chairman of the Board of Directors, or the President
or any Vice President and by the Treasurer or Assistant Treasurer or the
Secretary or Assistant Secretary, certifying the number of shares owned by him
in the corporation. Any or all of the signatures on the certificate may be
facsimiles. In case any officer, transfer agent, or registrar who has signed or
whose facsimile signature has been placed upon a certificate shall have ceased
to be such officer, transfer agent, or registrar before such certificate is
issued, it may be issued with the same effect as if he were such officer,
transfer agent, or registrar at the date of issue. Each certificate shall state
upon the face or back thereof, in full or in summary, all of the powers,
designations, preferences, and rights, and the limitations or restrictions of
the shares authorized to be issued or shall, except as otherwise required by
law, set forth on the face or back a statement that the corporation will furnish
without charge to each stockholder who so requests the powers, designations,
preferences and relative, participating, optional, or other special rights of
each class of stock or series thereof and the qualifications, limitations or
restrictions of such preferences and/or rights. Within a reasonable time after
the issuance or transfer of uncertificated stock, the corporation shall send to
the registered owner thereof a written notice containing the information
required to be set forth or stated on certificates pursuant to this section or
otherwise required by law or with respect to this section a statement that the
corporation will furnish without charge to each stockholder who so requests the
powers, designations, preferences and relative participating, optional or other
special rights of each class of stock or series thereof and the qualifications,
limitations or restrictions of such preferences and/or rights. Except as
otherwise expressly provided by law, the rights and obligations of the holders
of certificates representing stock of the same class and series shall be
identical.





                                      15.
<PAGE>
 
     Section 35.    Lost Certificates. A new certificate or certificates shall
be issued in place of any certificate or certificates theretofore issued by the
corporation alleged to have been lost, stolen, or destroyed, upon the making of
an affidavit of that fact by the person claiming the certificate of stock to be
lost, stolen, or destroyed. The corporation may require, as a condition
precedent to the issuance of a new certificate or certificates, the owner of
such lost, stolen, or destroyed certificate or certificates, or his legal
representative, to advertise the same in such manner as it shall require or to
give the corporation a surety bond in such form and amount as it may direct as
indemnity against any claim that may be made against the corporation with
respect to the certificate alleged to have been lost, stolen, or destroyed.

     Section 36.    Transfers.

       (a)  Transfers of record of shares of stock of the corporation shall be
made only upon its books by the holders thereof, in person or by attorney duly
authorized, and upon the surrender of a properly endorsed certificate or
certificates for a like number of shares.

       (b)  The corporation shall have power to enter into and perform any
agreement with any number of stockholders of any one or more classes of stock of
the corporation to restrict the transfer of shares of stock of the corporation
of any one or more classes owned by such stockholders in any manner not
prohibited by the General Corporation Law of Delaware.

     Section 37.    Fixing Record Dates.

       (a)  In order that the corporation may determine the stockholders
entitled to notice of or to vote at any meeting of stockholders or any
adjournment thereof, the Board of Directors may fix, in advance, a record date,
which record date shall not precede the date upon which the resolution fixing
the record date is adopted by the Board of Directors, and which record date
shall not be more than sixty (60) nor less than ten (10) days before the date of
such meeting. If no record date is fixed by the Board of Directors, the record
date for determining stockholders entitled to notice of or to vote at a meeting
of stockholders shall be at the close of business on the day next preceding the
day on which notice is given, or if notice is waived, at the close of business
on the day next preceding the day on which the meeting is held. A determination
of stockholders of record entitled to notice of or to vote at a meeting of
stockholders shall apply to any adjournment of the meeting; provided, however,
that the Board of Directors may fix a new record date for the adjourned meeting.

       (b)  In order that the corporation may determine the stockholders
entitled to receive payment of any dividend or other distribution or allotment
of any rights or the stockholders entitled to exercise any rights in respect of
any change, conversion or exchange of stock, or for the purpose of any other
lawful action, the Board of Directors may fix, in advance, a record date, which
record date shall not precede the date upon which the resolution fixing the
record date is adopted, and which record date shall be not more than sixty (60)
days prior to such action. If no record date is fixed, the record date for
determining stockholders for any such 




                                      16.
<PAGE>
 
purpose shall be at the close of business on the day on which the Board of
Directors adopts the resolution relating thereto.

     Section 38.    Registered Stockholders. The corporation shall be entitled
to recognize the exclusive right of a person registered on its books as the
owner of shares to receive dividends, and to vote as such owner, and shall not
be bound to recognize any equitable or other claim to or interest in such share
or shares on the part of any other person whether or not it shall have express
or other notice thereof, except as otherwise provided by the laws of Delaware.


                                 Article VIII

                      Other Securities Of The Corporation

     Section 39.    Execution of Other Securities. All bonds, debentures and
other corporate securities of the corporation, other than stock certificates
(covered in Section 34), may be signed by the Chairman of the Board of
Directors, the President or any Vice President, or such other person as may be
authorized by the Board of Directors, and the corporate seal impressed thereon
or a facsimile of such seal imprinted thereon and attested by the signature of
the Secretary or an Assistant Secretary, or the Chief Financial Officer or
Treasurer or an Assistant Treasurer; provided, however, that where any such
bond, debenture or other corporate security shall be authenticated by the manual
signature, or where permissible facsimile signature, of a trustee under an
indenture pursuant to which such bond, debenture or other corporate security
shall be issued, the signatures of the persons signing and attesting the
corporate seal on such bond, debenture or other corporate security may be the
imprinted facsimile of the signatures of such persons. Interest coupons
appertaining to any such bond, debenture or other corporate security,
authenticated by a trustee as aforesaid, shall be signed by the Treasurer or an
Assistant Treasurer of the corporation or such other person as may be authorized
by the Board of Directors, or bear imprinted thereon the facsimile signature of
such person. In case any officer who shall have signed or attested any bond,
debenture or other corporate security, or whose facsimile signature shall appear
thereon or on any such interest coupon, shall have ceased to be such officer
before the bond, debenture or other corporate security so signed or attested
shall have been delivered, such bond, debenture or other corporate security
nevertheless may be adopted by the corporation and issued and delivered as
though the person who signed the same or whose facsimile signature shall have
been used thereon had not ceased to be such officer of the corporation.







                                      17.
<PAGE>
 
                                  Article IX

                                   Dividends

     Section 40.    Declaration of Dividends. Dividends upon the capital stock
of the corporation, subject to the provisions of the Certificate of
Incorporation, if any, may be declared by the Board of Directors pursuant to law
at any regular or special meeting. Dividends may be paid in cash, in property,
or in shares of the capital stock, subject to the provisions of the Certificate
of Incorporation.

     Section 41.    Dividend Reserve. Before payment of any dividend, there may
be set aside out of any funds of the corporation available for dividends such
sum or sums as the Board of Directors from time to time, in their absolute
discretion, think proper as a reserve or reserves to meet contingencies, or for
equalizing dividends, or for repairing or maintaining any property of the
corporation, or for such other purpose as the Board of Directors shall think
conducive to the interests of the corporation, and the Board of Directors may
modify or abolish any such reserve in the manner in which it was created.


                                   Article X

                                  Fiscal Year

     Section 42.    Fiscal Year. The fiscal year of the corporation shall be
fixed by resolution of the Board of Directors.


                                  Article XI

                                Indemnification

     Section 43.  Indemnification of Directors, Executive Officers, Other
Officers, Employees and Other Agents.

       (a)  Directors and Officers.  The corporation shall indemnify its
directors and officers to the fullest extent not prohibited by the Delaware
General Corporation Law; provided, however, that the corporation may modify the
extent of such indemnification by individual contracts with its directors and
officers; and, provided, further, that the corporation shall not be required to
indemnify any director or officer in connection with any proceeding (or part
thereof) initiated by such person unless (i) such indemnification is expressly
required to be made by law, (ii) the proceeding was authorized by the Board of
Directors of the corporation, (iii) such 




                                      18.
<PAGE>
 
indemnification is provided by the corporation, in its sole discretion, pursuant
to the powers vested in the corporation under the Delaware General Corporation
Law or (iv) such indemnification is required to be made under subsection (d).

       (b)  Expenses.  The corporation shall advance to any person who was or is
a party or is threatened to be made a party to any threatened, pending or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative, by reason of the fact that he is or was a director or officer, of
the corporation, or is or was serving at the request of the corporation as a
director or executive officer of another corporation, partnership, joint
venture, trust or other enterprise, prior to the final disposition of the
proceeding, promptly following request therefor, all expenses incurred by any
director or officer in connection with such proceeding upon receipt of an
undertaking by or on behalf of such person to repay said amounts if it should be
determined ultimately that such person is not entitled to be indemnified under
this Bylaw or otherwise.

Notwithstanding the foregoing, unless otherwise determined pursuant to paragraph
(e) of this Bylaw, no advance shall be made by the corporation to an officer of
the corporation (except by reason of the fact that such officer is or was a
director of the corporation in which event this paragraph shall not apply) in
any action, suit or proceeding, whether civil, criminal, administrative or
investigative, if a determination is reasonably and promptly made (i) by the
Board of Directors by a majority vote of a quorum consisting of directors who
were not parties to the proceeding, or (ii) if such quorum is not obtainable,
or, even if obtainable, a quorum of disinterested directors so directs, by
independent legal counsel in a written opinion, that the facts known to the
decision-making party at the time such determination is made demonstrate clearly
and convincingly that such person acted in bad faith or in a manner that such
person did not believe to be in or not opposed to the best interests of the
corporation.

       (c)  Enforcement.  Without the necessity of entering into an express
contract, all rights to indemnification and advances to directors and officers
under this Bylaw shall be deemed to be contractual rights and be effective to
the same extent and as if provided for in a contract between the corporation and
the director or officer.  Any right to indemnification or advances granted by
this Bylaw to a director or officer shall be enforceable by or on behalf of the
person holding such right in any court of competent jurisdiction if (i) the
claim for indemnification or advances is denied, in whole or in part, or (ii) no
disposition of such claim is made within ninety (90) days of request therefor.
The claimant in such enforcement action, if successful in whole or in part,
shall be entitled to be paid also the expense of prosecuting his claim.  In
connection with any claim for indemnification, the corporation shall be entitled
to raise as a defense to any such action that the claimant has not met the
standards of conduct that make it permissible under the Delaware General
Corporation Law for the corporation to indemnify the claimant for the amount
claimed.  In connection with any claim by an officer of the corporation (except
in any action, suit or proceeding, whether civil, criminal, administrative or
investigative, by reason of the fact that such executive officer is or was a
director of the corporation) for advances, the corporation shall be entitled to
raise a defense as to any such action clear and 





                                      19.
<PAGE>
 
convincing evidence that such person acted in bad faith or in a manner that such
person did not believe to be in or not opposed to the best interests of the
corporation, or with respect to any criminal action or proceeding that such
person acted without reasonable cause to believe that his conduct was lawful.
Neither the failure of the corporation (including its Board of Directors,
independent legal counsel or its stockholders) to have made a determination
prior to the commencement of such action that indemnification of the claimant is
proper in the circumstances because he has met the applicable standard of
conduct set forth in the Delaware General Corporation Law, nor an actual
determination by the corporation (including its Board of Directors, independent
legal counsel or its stockholders) that the claimant has not met such applicable
standard of conduct, shall be a defense to the action or create a presumption
that claimant has not met the applicable standard of conduct. In any suit
brought by a director or officer to enforce a right to indemnification or to an
advancement of expenses hereunder, the burden of proving that the director or
officer is not entitled to be indemnified, or to such advancement of expenses,
under this Article XI or otherwise shall be on the corporation.

       (d)  Non-Exclusivity of Rights.  The rights conferred on any person by
this Bylaw shall not be exclusive of any other right which such person may have
or hereafter acquire under any statute, provision of the Certificate of
Incorporation, Bylaws, agreement, vote of stockholders or disinterested
directors or otherwise, both as to action in his official capacity and as to
action in another capacity while holding office. The corporation is specifically
authorized to enter into individual contracts with any or all of its directors,
officers, employees or agents respecting indemnification and advances, to the
fullest extent not prohibited by the Delaware General Corporation Law.

       (e)  Survival of Rights.  The rights conferred on any person by this
Bylaw shall continue as to a person who has ceased to be a director, officer,
employee or other agent and shall inure to the benefit of the heirs, executors
and administrators of such a person.

       (f)  Insurance.  To the fullest extent permitted by the Delaware General
Corporation Law, the corporation, upon approval by the Board of Directors, may
purchase insurance on behalf of any person required or permitted to be
indemnified pursuant to this Bylaw.

       (g)  Amendments.  Any repeal or modification of this Bylaw shall only be
prospective and shall not affect the rights under this Bylaw in effect at the
time of the alleged occurrence of any action or omission to act that is the
cause of any proceeding against any agent of the corporation.

       (h)  Saving Clause.  If this Bylaw or any portion hereof shall be
invalidated on any ground by any court of competent jurisdiction, then the
corporation shall nevertheless indemnify each director and executive officer to
the full extent not prohibited by any applicable portion of this Bylaw that
shall not have been invalidated, or by any other applicable law.





                                      20.
<PAGE>
 
       (i)  Certain Definitions.  For the purposes of this Bylaw, the
following definitions shall apply:

         (i)The term "proceeding" shall be broadly construed and shall
     include, without limitation, the investigation, preparation, prosecution,
     defense, settlement, arbitration and appeal of, and the giving of testimony
     in, any threatened, pending or completed action, suit or proceeding,
     whether civil, criminal, administrative or investigative.

        (ii)The term "expenses" shall be broadly construed and shall include,
     without limitation, court costs, attorneys' fees, witness fees, fines,
     amounts paid in settlement or judgment and any other costs and expenses of
     any nature or kind incurred in connection with any proceeding.

       (iii)The term the "corporation" shall include, in addition to the
     resulting corporation, any constituent corporation (including any
     constituent of a constituent) absorbed in a consolidation or merger which,
     if its separate existence had continued, would have had power and authority
     to indemnify its directors, officers, and employees or agents, so that any
     person who is or was a director, officer, employee or agent of such
     constituent corporation, or is or was serving at the request of such
     constituent corporation as a director, officer, employee or agent of
     another corporation, partnership, joint venture, trust or other enterprise,
     shall stand in the same position under the provisions of this Bylaw with
     respect to the resulting or surviving corporation as he would have with
     respect to such constituent corporation if its separate existence had
     continued.

        (iv)References to a "director," "executive officer," "officer,"
     "employee," or "agent" of the corporation shall include, without
     limitation, situations where such person is serving at the request of the
     corporation as, respectively, a director, executive officer, officer,
     employee, trustee or agent of another corporation, partnership, joint
     venture, trust or other enterprise.

         (v)References to "other enterprises" shall include employee benefit
     plans; references to "fines" shall include any excise taxes assessed on a
     person with respect to an employee benefit plan; and references to "serving
     at the request of the corporation" shall include any service as a director,
     officer, employee or agent of the corporation which imposes duties on, or
     involves services by, such director, officer, employee, or agent with
     respect to an employee benefit plan, its participants, or beneficiaries;
     and a person who acted in good faith and in a manner he reasonably believed
     to be in the interest of the participants and beneficiaries of an employee
     benefit plan shall be deemed to have acted in a manner "not opposed to the
     best interests of the corporation" as referred to in this Bylaw.




                                      21.
<PAGE>
 
                                  Article XII

                                    Notices

     Section 44.    Notices.

       (a)  Notice to Stockholders.  Whenever, under any provisions of these
Bylaws, notice is required to be given to any stockholder, it shall be given in
writing, timely and duly deposited in the United States mail, postage prepaid,
and addressed to his last known post office address as shown by the stock record
of the corporation or its transfer agent.

       (b)  Notice to directors.  Any notice required to be given to any
director may be given by the method stated in subsection (a), or by facsimile,
telex or telegram, except that such notice other than one which is delivered
personally shall be sent to such address as such director shall have filed in
writing with the Secretary, or, in the absence of such filing, to the last known
post office address of such director.

       (c)  Affidavit of Mailing.  An affidavit of mailing, executed by a duly
authorized and competent employee of the corporation or its transfer agent
appointed with respect to the class of stock affected, specifying the name and
address or the names and addresses of the stockholder or stockholders, or
director or directors, to whom any such notice or notices was or were given, and
the time and method of giving the same, shall in the absence of fraud, be prima
facie evidence of the facts therein contained.

       (d)  Time Notices Deemed Given.  All notices given by mail, as above
provided, shall be deemed to have been given as at the time of mailing, and all
notices given by facsimile, telex or telegram shall be deemed to have been given
as of the sending time recorded at time of transmission.

       (e)  Methods of Notice.  It shall not be necessary that the same method
of giving notice be employed in respect of all directors, but one permissible
method may be employed in respect of any one or more, and any other permissible
method or methods may be employed in respect of any other or others.

       (f)  Failure to Receive Notice.  The period or limitation of time within
which any stockholder may exercise any option or right, or enjoy any privilege
or benefit, or be required to act, or within which any director may exercise any
power or right, or enjoy any privilege, pursuant to any notice sent him in the
manner above provided, shall not be affected or extended in any manner by the
failure of such stockholder or such director to receive such notice.

       (g)  Notice to Person with Whom Communication Is Unlawful.  Whenever
notice is required to be given, under any provision of law or of the Certificate
of Incorporation or 




                                      22.
<PAGE>
 
Bylaws of the corporation, to any person with whom communication is unlawful,
the giving of such notice to such person shall not be required and there shall
be no duty to apply to any governmental authority or agency for a license or
permit to give such notice to such person. Any action or meeting which shall be
taken or held without notice to any such person with whom communication is
unlawful shall have the same force and effect as if such notice had been duly
given. In the event that the action taken by the corporation is such as to
require the filing of a certificate under any provision of the Delaware General
Corporation Law, the certificate shall state, if such is the fact and if notice
is required, that notice was given to all persons entitled to receive notice
except such persons with whom communication is unlawful.

       (h)  Notice to Person with Undeliverable Address.  Whenever notice is
required to be given, under any provision of law or the Certificate of
Incorporation or Bylaws of the corporation, to any stockholder to whom (i)
notice of two consecutive annual meetings, and all notices of meetings or of the
taking of action by written consent without a meeting to such person during the
period between such two consecutive annual meetings, or (ii) all, and at least
two, payments (if sent by first class mail) of dividends or interest on
securities during a twelve-month period, have been mailed addressed to such
person at his address as shown on the records of the corporation and have been
returned undeliverable, the giving of such notice to such person shall not be
required.  Any action or meeting which shall be taken or held without notice to
such person shall have the same force and effect as if such notice had been duly
given.  If any such person shall deliver to the corporation a written notice
setting forth his then current address, the requirement that notice be given to
such person shall be reinstated.  In the event that the action taken by the
corporation is such as to require the filing of a certificate under any
provision of the Delaware General Corporation Law, the certificate need not
state that notice was not given to persons to whom notice was not required to be
given pursuant to this paragraph.


                                 Article XIII

                                  Amendments

     Section 45.    Amendments. Subject to paragraph (h) of Section 43 of the
Bylaws, the Bylaws may be altered or amended or new Bylaws adopted by the
affirmative vote of at least sixty-six and two-thirds percent (66-2/3%) of the
voting power of all of the then-outstanding shares of the Voting Stock. The
Board of Directors shall also have the power to adopt, amend, or repeal Bylaws.






                                      23.
<PAGE>
 
                                  Articl XIV

                               Loans To Officers
 
     Section 46.    Loans to Officers. The corporation may lend money to, or
guarantee any obligation of, or otherwise assist any officer or other employee
of the corporation or of its subsidiaries, including any officer or employee who
is a Director of the corporation or its subsidiaries, whenever, in the judgment
of the Board of Directors, such loan, guarantee or assistance may reasonably be
expected to benefit the corporation. The loan, guarantee or other assistance may
be with or without interest and may be unsecured, or secured in such manner as
the Board of Directors shall approve, including, without limitation, a pledge of
shares of stock of the corporation. Nothing in these Bylaws shall be deemed to
deny, limit or restrict the powers of guaranty or warranty of the corporation at
common law or under any statute.











                                      24.

 
<PAGE>
 
<TABLE>
<CAPTION>
 
                                  TABLE OF CONTENTS
                                  -----------------

                                                                   Page
                                                                   ----
<S>                 <C>                                            <C> 

Article I           Offices.......................................   1.
     Section 1.     Registered Office.............................   1.
     Section 2.     Other Offices.................................   1.
                
Article II          Corporate Seal................................   1.
     Section 3.     Corporate Seal................................   1.
                
Article III         Stockholders' Meetings........................   1.
     Section 4.     Place of Meetings.............................   1.
     Section 5.     Annual Meeting................................   2.
     Section 6.     Special Meetings..............................   3.
     Section 7.     Notice of Meetings............................   4.
     Section 8.     Quorum........................................   4.
     Section 9.     Adjournment and Notice of Adjourned Meetings..   5.
     Section 10.    Voting Rights.................................   5.
     Section 11.    Joint Owners of Stock.........................   5.
     Section 12.    List of Stockholders..........................   5.
     Section 13.    Action Without Meeting........................   6.
     Section 14.    Organization..................................   6.
                
Article IV          Directors.....................................   6.
     Section 15.    Number and Term of Office.....................   6.
     Section 16.    Powers........................................   7.
     Section 17.    Classes of Directors..........................   7.
     Section 18.    Vacancies.....................................   7.
     Section 19.    Resignation...................................   7.
     Section 20.    Removal.......................................   8.
     Section 21.    Meetings......................................   8.
          (a)       Annual Meetings...............................   8.
          (b)       Regular Meetings..............................   8.
          (c)       Special Meetings..............................   8.
          (d)       Telephone Meetings............................   8.
          (e)       Notice of Meetings............................   8.
          (f)       Waiver of Notice..............................   9.
     Section 22.    Quorum and Voting.............................   9.
     Section 23.    Action Without Meeting........................   9.
     Section 24.    Fees and Compensation.........................   9.
     Section 25.    Committees....................................  10.
          (a)       Executive Committee...........................  10.



                                      i.
</TABLE> 

<PAGE>
 
<TABLE> 
<CAPTION> 

                               TABLE OF CONTENTS
                               -----------------
                                  (continued)

<S>                 <C>                                             <C> 
 
          (b)       Other Committees..............................  10.
          (c)       Term..........................................  10.
          (d)       Meetings......................................  11.
     Section 26.    Organization..................................  11.
                
Article V           Officers......................................  11.
     Section 27.    Officers Designated...........................  11.
     Section 28.    Tenure and Duties of Officers.................  12.
          (a)       General.......................................  12.
          (b)       Duties of Chairman of the Board of Directors..  12.
          (c)       Duties of President...........................  12.
          (d)       Duties of Vice Presidents.....................  12.
          (e)       Duties of Secretary...........................  12.
          (f)       Duties of Chief Financial Officer.............  12.
     Section 29.    Delegation of Authority.......................  13.
     Section 30.    Resignations..................................  13.
     Section 31.    Removal.......................................  13.
                
Article VI          Execution Of Corporate Instruments And Voting
                    Of Securities Owned By The Corporation........  13.
     Section 32.    Execution of Corporate Instruments............  13.
     Section 33.    Voting of Securities Owned by the Corporation.  14.
                
Article VII         Shares Of Stock...............................  14.
     Section 34.    Form and Execution of Certificates............  14.
     Section 35.    Lost Certificates.............................  15.
     Section 36.    Transfers.....................................  15.
     Section 37.    Fixing Record Dates...........................  15.
     Section 38.    Registered Stockholders.......................  16.
                
Article VIII        Other Securities Of The Corporation...........  16.
     Section 39.    Execution of Other Securities.................  16.
                
Article IX          Dividends.....................................  17.
     Section 40.    Declaration of Dividends......................  17.
     Section 41.    Dividend Reserve..............................  17.

</TABLE> 

                                      ii.

<PAGE>
 
<TABLE> 
<CAPTION> 

                               TABLE OF CONTENTS
                               -----------------
                                  (continued)

<S>                 <C>                                             <C> 
 
Article X           Fiscal Year...................................  17.
     Section 42.    Fiscal Year...................................  17.
                
Article XI          Indemnification...............................  17.
     Section 43.    Indemnification of Directors, Executive
                    Officers, Other Officers, Employees and Other
                    Agents........................................  17.
          (a)       Directors and Officers........................  17.
          (b)       Expenses......................................  18.
          (c)       Enforcement...................................  18.
          (d)       Non-Exclusivity of Rights.....................  19.
          (e)       Survival of Rights............................  19.
          (f)       Insurance.....................................  19.
          (g)       Amendments....................................  19.
          (h)       Saving Clause.................................  19.
          (i)       Certain Definitions...........................  19.
                
Article XII         Notices.......................................  20.
     Section 44.    Notices.......................................  20.
          (a)       Notice to Stockholders........................  20.
          (b)       Notice to directors...........................  21.
          (c)       Affidavit of Mailing..........................  21.
          (d)       Time Notices Deemed Given.....................  21.
          (e)       Methods of Notice.............................  21.
          (f)       Failure to Receive Notice.....................  21.
          (g)       Notice to Person with Whom Communication Is
                    Unlawful......................................  21.
          (h)       Notice to Person with Undeliverable Address...  21.
                
Article XIII        Amendments....................................  22.
     Section 45.    Amendments....................................  22.
                
Article XIV         Loans To Officers.............................  22.
     Section 46.    Loans to Officers                               22.

</TABLE>





                                     iii.

<PAGE>
 
                           IGEN INTERNATIONAL, INC.
                                 EXHIBIT 11.1

               STATEMENT RE: COMPUTATION OF NET INCOME PER SHARE
               (UNAUDITED, IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                           THREE MONTHS ENDED           NINE MONTHS ENDED
                                                               DECEMBER 31,                 DECEMBER 31,
                                                             1996       1995            1996       1995
                                                           -------    -------         -------     -------
<S>                                                        <C>        <C>             <C>         <C>
Average common shares outstanding:                          14,969     14,771          14,955       14,742
                                                           -------    -------         -------      -------

Net loss                                                   $(2,237)   $(1,838)        $(5,471)     $(5,627)
                                                           =======    =======         =======      =======

Net loss per share                                         $  (.15)   $  (.12)        $  (.37)     $  (.38)
                                                           =======    =======         =======      =======
</TABLE>

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          MAR-31-1997
<PERIOD-START>                             APR-01-1996
<PERIOD-END>                               DEC-31-1996
<CASH>                                             990
<SECURITIES>                                     7,088
<RECEIVABLES>                                    2,071
<ALLOWANCES>                                         0
<INVENTORY>                                      1,917
<CURRENT-ASSETS>                                12,871
<PP&E>                                           6,727
<DEPRECIATION>                                   3,486
<TOTAL-ASSETS>                                  16,560
<CURRENT-LIABILITIES>                            4,202
<BONDS>                                              0
                                0
                                          0
<COMMON>                                            15
<OTHER-SE>                                      12,222
<TOTAL-LIABILITY-AND-EQUITY>                    16,560
<SALES>                                          5,031
<TOTAL-REVENUES>                                13,851
<CGS>                                            1,969
<TOTAL-COSTS>                                   19,993
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               (671)<F1>
<INCOME-PRETAX>                                (5,471)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (5,471)
<EPS-PRIMARY>                                    (.37)
<EPS-DILUTED>                                    (.37)
<FN>
<F1>Interest income, net.
</FN>
        

</TABLE>


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