EXOGEN INC
8-K, 1998-10-19
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549


                                    FORM 8-K


                                 CURRENT REPORT



                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934



                Date of Report (Date of earliest event reported)
                               September 30, 1998



                                  Exogen, Inc.
- --------------------------------------------------------------------------------
             (Exact name of Registrant as specified in its Charter)

                                    Delaware
- --------------------------------------------------------------------------------
                 (State or other jurisdiction of incorporation)

            000-26154                               22-3208468
- -------------------------------------------------------------------------------
   (Commission File Number)             (IRS Employer Identification Number)


10 Constitution Avenue, P.O. Box 6860, Piscataway, NJ               08855
- --------------------------------------------------------------------------------
(Address of principal executive offices)                         (Zip Code)

                                 (732) 981-0990
              Registrant's telephone number, including area code:
- --------------------------------------------------------------------------------


                                       N/A
- --------------------------------------------------------------------------------
         (Former name or former address, if changed since last report)
<PAGE>
Item 5.  Other Events

                  On September 30, 1998 and October 9, 1998, the Company settled
                  all outstanding  litigation in connection with Exogen, Inc. v.
                  Pilla  Consulting,   Inc.  and  Arthur  A.  Pilla,  Index  No.
                  601689/97 filed in the Supreme Court of the State of New York,
                  County  of New York  and  Jonathan  J.  Kaufman  v.  Interpore
                  Orthopedics,  Inc. and Exogen,  Inc, No. 95 Civ. 2339 filed in
                  the United States District Court for the Southern  District of
                  New York. The Company also entered into a settlement agreement
                  with  Alessandro  Chiabrera  ("Chiabrera").  Messrs.  Kaufman,
                  Pilla  and   Chiabrera,   former   consultants   to  Interpore
                  Orthopedics, Inc. ("Interpore"), the company from which Exogen
                  purchased  certain  SAFHS  ultrasound  assets  at the  time of
                  Exogen's  formation,  claimed  the right to certain  royalties
                  from  the sale of SAFHS  devices.  As part of the  settlement,
                  Exogen is  obligated  to pay the parties an aggregate of Seven
                  Hundred  Thousand  Dollars  ($700,000),   One  Hundred  Ninety
                  Thousand Nine Hundred  Eight  Dollars  ($190,908) of which was
                  payable   initially.   The  remainder  is  payable  in  annual
                  installments through July 2002. In addition,  Exogen issued to
                  Pilla  and  Chiabrera   five  year  warrants  to  purchase  an
                  aggregate of One Hundred Twenty Five Thousand (125,000) shares
                  of Exogen's  common  stock,  par value  $0.0001 per share (the
                  "Common  Stock"),  at an  exercise  price of Three and  12/100
                  Dollars   ($3.12)   per  share  and   granted   them   certain
                  registration rights. In addition to Exogen, Interpore was also
                  a party to the  settlements  and is  obligated  to pay certain
                  amounts to the parties.

Item 7.  Financial Statements and Exhibits

                  (c)  Exhibits

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


    10.1          Promissory Note, dated October 6, 1998,  issued by the Company
                  to Jonathan J.  Kaufman.  

    10.2          Promissory Note, dated October 6, 1998,  issued by the Company
                  to Alessandro Chiabrera.

    10.3          Warrant  to  Purchase  Common  Stock,  dated  October 9, 1998,
                  issued by the Company to Alessandro Chiabrera.

    10.4          Registration  Rights Agreement,  dated October 9, 1998, by and
                  between the Company and Alessandro Chiabrera.

    10.5          Promissory  Note,  dated  September  30,  1998,  issued by the
                  Company to Pilla Consulting, Inc.

    10.6          Warrant to Purchase  Common Stock,  dated  September 30, 1998,
                  issued by the Company to Arthur A. Pilla.

    10.7          Registration  Rights  Agreement,  dated September 30, 1998, by
                  and between the Company and Arthur A. Pilla.




<PAGE>


                                   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, hereto duly authorized.


                                     EXOGEN, INC.
                                     (Registrant)


Date:      October 19, 1998          By: /s/  PATRICK A. McBRAYER
                                         ------------------------- 
                                         Patrick A. McBrayer
                                         President and Chief Executive Officer


                                                                    EXHIBIT 10.1

                                    EXHIBIT B
                                 PROMISSORY NOTE

         In consideration  of, and in connection with, the Settlement  Agreement
and Mutual  Release  entered into as of October 9, 1998, by and among  plaintiff
Jonathan  J.  Kaufman  ("Kaufman")  and  defendants,   Interpore   International
("Interpore")  and Exogen,  Inc.  ("Exogen") (the "Settlement  Agreement"),  the
undersigned,  Exogen,  whose current business address is 10 Constitution Avenue,
P.O. Box 6860,  Piscataway,  NJ 08855,  promises to pay to the order of Kaufman,
the  principal  amount  of three  hundred  eighty  one  thousand  eight  hundred
seventeen dollars and eighty cents  ($381,817.80) in installments,  as set forth
in Schedule 1 attached  hereto,  and made a part hereof.  All payments  shall be
made to Jonathan J. Kaufman care of Hecht & Steckman, P.C., 60 East 42nd Street,
Suite  5101,  New  York,  New  York  10165-5101,  or at such  other  address  as
designated by Kaufman in writing to Exogen. 

UNCONDITIONAL RIGHT TO PAYMENT

         The obligation of Exogen to pay each and every  installment  under this
Promissory  Note is  unconditional  and  irrevocable and the right of Kaufman to
receive each and every payment hereunder is uncontestable.

         Exogen  shall not have any right of offset with respect to any payments
due hereunder and Exogen hereby waives any defenses or counterclaims which would
result in a right of offset.

EVENTS OF DEFAULT

         The  occurrence  of any of the  following  events shall be considered a
default in the obligations under this Promissory Note ("Events of Default"):

         (a)      Failure to timely pay any  installment set forth on Schedule 1
                  annexed  hereto.  Subject  to  paragraph  5 of the  Settlement
                  Agreement, a payment shall only be timely if received by Hecht
                  &  Steckman,  P.C.  on or  before  the due date  set  forth in
                  Schedule  1,  subject  to the ten  (10)-day  period  set forth
                  below; or

         (b)      Failure by Exogen to observe or perform any of the
                  covenants or agreements in the Settlement Agreement; or

         (c)      A decree  or order by a court  adjudging  Exogen  bankrupt  or
                  insolvent, or approving, as properly filed, a petition seeking
                  reorganization   of   Exogen's   affairs   under  the  federal
                  bankruptcy code or any other similar federal, state or foreign
                  law, which is not dismissed within 60 days of filing; or

         (d)      A decree or order of a court for the appointment of a receiver
                  or trustee or assignee in bankruptcy or insolvency for Exogen,
                  or for the winding-up or liquidation of the affairs of Exogen;
                  or

         (e)      Exogen  institutes  proceedings  to be adjudicated a voluntary
                  bankrupt  or  consents  to  the  institution  of a  bankruptcy
                  proceedings  or files a petition or answer or consent  seeking
                  reorganization  or  rearrangement  with  creditors  under  any
                  federal  or a state or  foreign  bankruptcy  act or any  other
                  similar federal or state law; or
<PAGE>
         (f)      Exogen  makes an  assignment  for the benefit of  creditors or
                  admits in writing an inability to pay debts  generally as they
                  become due; or

         (g)      The agreement by Exogen to any merger,  buy-out,  acquisition,
                  asset sale transaction or other corporate event resulting in a
                  change of control which is not conditioned  upon the acquiring
                  entity  assuming  Exogen's  obligations  under this Promissory
                  Note.

         Upon the occurrence of any of the above events of default, and upon ten
(10)  days  written  notice  to Exogen in  accordance  with  paragraph  5 of the
Settlement  Agreement,  all payments set forth on Schedule 1, which have not yet
been made, shall become immediately due and payable without presentment,  demand
or notice of any kind,  all of which are hereby  expressly  waived,  anything in
this Promissory Note to the contrary notwithstanding. Upon the expiration of the
ten (10) day notice period,  Kaufman shall have the right to institute an action
against Exogen for all payments set forth on Schedule 1, which have not yet been
made,  with  interest  thereon  at the  rate of 9% per  annum  from  the date of
commencement  of the action.  Exogen shall be liable for any and all  attorneys'
fees incurred by Kaufman in such an action.

PREPAYMENTS

         Exogen  shall  have the right to  pre-pay  the  unpaid  balance of this
Promissory Note without penalty upon 10 days written notice to Kaufman.

MERGER OR CONSOLIDATION

         The  obligations  of Exogen  hereunder  shall extend to, and be binding
upon,  each of its  successors,  assigns,  any corporation of which it owns more
than 50% of the voting stock, and the transferee of all, or  substantially  all,
of Exogen's assets.

Dated: October 6, 1998



                                              EXOGEN, INC.




                                              By:    /s/  PATRICK A. McBRAYER
                                                     ------------------------
                                              Name:  Patrick A. McBrayer
                                              Title:  President and Chief
                                                      Executive Officer
<PAGE>
                                   SCHEDULE 1

                            PAYMENTS BY EXOGEN, INC.
                                       TO
                               JONATHAN J. KAUFMAN


             Date                                              Amount

         July 1, 1999                                        $127,272.60

         July 1, 2000                                        $127,272.60

         July 1, 2001                                        $127,272.60



                                                                    EXHIBIT 10.2

                                    EXHIBIT C
                                 PROMISSORY NOTE

         In consideration  of, and in connection with, the Settlement  Agreement
and Mutual Release  entered into as of October 9, 1998, by and among  Alessandro
Chiabrera  ("Chiabrera") and Interpore  International  ("Interpore") and Exogen,
Inc. ("Exogen") (the "Settlement  Agreement"),  the undersigned,  Exogen,  whose
current business address is 10 Constitution  Avenue, P.O. Box 6860,  Piscataway,
NJ 08855,  promises to pay to the order of Chiabrera,  the  principal  amount of
Fifty  Thousand  Nine  Hundred  Nine  Dollars  and Eight Cents  ($50,909.08)  in
installments,  as set  forth in  Schedule  1  attached  hereto,  and made a part
hereof.  All payments  shall be made to Alessandro  Chiabrera in care of Hecht &
Steckman, P.C., 60 East 42nd Street, Suite 5101, New York, New York 10165- 5101,
or at such  other  address  as  designated  by  Chiabrera  in writing to Exogen.

UNCONDITIONAL RIGHT TO PAYMENT

         The obligation of Exogen to pay each and every  installment  under this
Promissory Note is  unconditional  and irrevocable and the right of Chiabrera to
receive each and every payment hereunder is uncontestable.

         Exogen  shall not have any right of offset with respect to any payments
due hereunder and Exogen hereby waives any defenses or counterclaims which would
result in a right of offset.

EVENTS OF DEFAULT

         The  occurrence  of any of the  following  events shall be considered a
default in the obligations under this Promissory Note ("Events of Default"):

         (a)      Failure to timely pay any  installment set forth on Schedule 1
                  annexed  hereto.  Subject  to  paragraph  5 of the  Settlement
                  Agreement, a payment shall only be timely if received by Hecht
                  &  Steckman,  P.C.  on or  before  the due date  set  forth in
                  Schedule  1,  subject  to the ten  (10)-day  period  set forth
                  below; or

         (b)      Failure by Exogen to observe or perform any of the
                  covenants or agreements in the Settlement Agreement; or

         (c)      A decree  or order by a court  adjudging  Exogen  bankrupt  or
                  insolvent, or approving, as properly filed, a petition seeking
                  reorganization   of   Exogen's   affairs   under  the  federal
                  bankruptcy code or any other similar federal, state or foreign
                  law, which is not dismissed within 60 days of filing; or

         (d)      A decree or order of a court for the appointment of a receiver
                  or trustee or assignee in bankruptcy or insolvency for Exogen,
                  or for the winding-up or liquidation of the affairs of Exogen;
                  or

         (e)      Exogen  institutes  proceedings  to be adjudicated a voluntary
                  bankrupt  or  consents  to  the  institution  of a  bankruptcy
                  proceedings  or files a petition or answer or consent  seeking
                  reorganization  or  rearrangement  with  creditors  under  any
                  federal  or a state or  foreign  bankruptcy  act or any  other
                  similar federal or state law; or

         (f)      Exogen  makes an  assignment  for the benefit of  creditors or
                  admits in writing an inability to pay debts  generally as they
                  become due; or
<PAGE>
         (g)      The agreement by Exogen to any merger,  buy-out,  acquisition,
                  asset sale transaction or other corporate event resulting in a
                  change of control which is not conditioned  upon the acquiring
                  entity  assuming  Exogen's  obligations  under this Promissory
                  Note.

         Upon the occurrence of any of the above events of default, and upon ten
(10)  days  written  notice  to Exogen in  accordance  with  paragraph  5 of the
Settlement  Agreement,  all payments set forth on Schedule 1, which have not yet
been made, shall become immediately due and payable without presentment,  demand
or notice of any kind,  all of which are hereby  expressly  waived,  anything in
this Promissory Note to the contrary notwithstanding. Upon the expiration of the
ten (10) day  notice  period,  Chiabrera  shall have the right to  institute  an
action  against  Exogen for all payments set forth on Schedule 1, which have not
yet been made,  with interest  thereon at the rate of 9% per annum from the date
of commencement of the action. Exogen shall be liable for any and all attorneys'
fees incurred by Chiabrera in such an action.

PREPAYMENTS

         Exogen  shall  have the right to  pre-pay  the  unpaid  balance of this
Promissory Note without penalty upon 10 days written notice to Chiabrera.

MERGER OR CONSOLIDATION

         The  obligations  of Exogen  hereunder  shall extend to, and be binding
upon,  each of its  successors,  assigns,  any corporation of which it owns more
than 50% of the voting stock, and the transferee of all, or  substantially  all,
of Exogen's assets.


Dated: October 6, 1998



                                                EXOGEN, INC.




                                                By:    /s/PATRICK A. McBRAYER 
                                                       ----------------------
                                                       PATRICK A. McBRAYER 
                                                Title: President and Chief
                                                       Executive Officer 

<PAGE>


                                   Schedule 1


===============================================================================
On or before              July 1, 1999                             $12,727.27
- -------------------------------------------------------------------------------
On or before              July 1, 2000                             $12,727.27
- -------------------------------------------------------------------------------
On or before              July 1, 2001                             $12,727.27
- -------------------------------------------------------------------------------
On or before              July 1, 2002                             $12,727.27
===============================================================================



                                                                    EXHIBIT 10.3


                                    EXHIBIT A


      THIS WARRANT HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933
     AND MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED OR HYPOTHECATED IN THE
        ABSENCE OF A REGISTRATION STATEMENT IN EFFECT WITH RESPECT TO THE
     SECURITIES UNDER SUCH ACT OR AN OPINION OF COUNSEL SATISFACTORY TO THE
                COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED.

No. CSPW-E03


              Void after 5:00 p.m. New York Time, on July 20, 2003
                        (subject to certain exceptions)
     Warrant to Purchase Forty-Five Thousand (45,000) Shares of Common Stock


                        WARRANT TO PURCHASE COMMON STOCK
                                       OF
                                  EXOGEN, INC.


                  This certifies that, for value received,  Alessandro Chiabrera
(the "Holder"),  is entitled,  subject to the terms set forth below, to purchase
from Exogen, Inc., a Delaware  corporation (the "Company"),  Forty-five Thousand
(45,000) fully paid,  validly issued and  nonassessable  shares of the Company's
common stock,  $.0001 par value per share (the "Common  Stock"),  upon surrender
hereof,  at the  principal  office of the Company  referred  to below,  with the
Notice of  Exercise  annexed  hereto duly  executed,  and  simultaneous  payment
therefor  in lawful  money of the  United  States or  otherwise  as  hereinafter
provided,  at $3.12 the  Average  Closing  Sale Price of Exogen's  Common  Stock
between June 16, 1998 and July 16, 1998, as quoted on the Nasdaq National Market
(the "Exercise Price"). The number,  character and Exercise Price of such shares
of Common Stock are subject to adjustment as provided below.  The term "Warrant"
as used  herein  shall  include  this  Warrant  and any  warrants  delivered  in
substitution or exchange therefor as provided herein.

                  1. Term of Warrant.  Subject to the terms and  conditions  set
forth  herein,  this Warrant shall be  exercisable,  in whole or in part, at any
time or from time to time on or after the date the Settlement  Agreement entered
into in conjunction herewith is executed and ending at 5:00 p.m., New York Time,
on July 20, 2003 and shall be void thereafter.

                  2. Exercise of Warrant.

                  (a)  The  purchase  rights  represented  by this  Warrant  are
exercisable by the Holder in whole or in part, at any time or from time to time,
during the term hereof as described in Section 1 above, by the surrender of this
Warrant and the Notice of Exercise annexed hereto duly completed and executed on
behalf of the  Holder,  at the office of the  Company  (or such other  office or
agency of the Company as it may  designate by notice in writing to the Holder at
the address of the Holder  appearing on the books of the Company),  upon payment
in cash or by check acceptable to the Company.
<PAGE>
                  In lieu of paying the purchase price in cash or by check,  the
Holder may elect to receive  shares of Common  Stock  equal to the value of this
Warrant  (or the portion  thereof  being  exercised),  in which even the Company
shall  issue to the Holder the number of shares of the  Company's  Common  Stock
computed using the following formula:

                                   X = Y (A-B)
                                   ___________
                                    
                                        A

                  Where:

                  X  =     the  number of shares of Common  Stock  subject  to
                           this Warrant to be issued to the Holder;

                  Y  =     the  number of shares of Common  Stock  subject  to
                           this Warrant otherwise purchasable under this Warrant
                           (at the date of such calculation);

                  A  =     the  Market  Price of one  share  of the  Company's
                           Common Stock (at the date of such calculation); and

                  B  =     Exercise   Price  (as  adjusted  to  the  date  of 
                           such calculation).


                           For purposes of the  foregoing  calculation,  "Market
Price" shall mean the last reported  sales price regular way, or in case no such
sales take place on such day,  the  average  of the  closing  bid and ask prices
regular  way,  of the  Company's  Common  Stock  in each  case on the  principal
national  securities  exchange  on which the  security  is listed or admitted to
trading,  or, if not listed or  admitted to trading on any  national  securities
exchange, on the Nasdaq National Market or, if the Company's Common Stock is not
listed or admitted to trading on any  national  securities  exchange  and is not
quoted on the Nasdaq  National  Market,  the  average of the closing bid and ask
prices as furnished by any New York Stock  Exchange  member firm  selected  from
time to time by the Board of Directors of the Company for such purpose.

                  (b)  This  Warrant  shall be  deemed  to have  been  exercised
immediately  prior to the close of  business  on the date of its  surrender  for
exercise as  provided  above,  and the person  entitled to receive the shares of
Common Stock  issuable upon such  exercise  shall be treated for all purposes as
the holder of record of such shares as of the close of business on such date. As
promptly as  practicable on or after such date, and in any event within ten (10)
days  thereafter,  the  Company at its  expense,  shall issue and deliver to the
person or persons  entitled to receive the same, a certificate  or  certificates
for the number of shares  issuable  upon such  exercise.  In the event that this
Warrant is  exercised  in part,  the  Company at its  expense  will  execute and
deliver a new  Warrant  of like tenor  exercisable  for the number of shares for
which this Warrant may then be exercised.

                  3.  Reservation of Shares.  The Company  covenants that during
the term  this  Warrant  is  exercisable,  the  Company  will  reserve  from its
authorized  and unissued  Common Stock a sufficient  number of shares to provide
for the issuance of Common Stock upon the exercise of this Warrant.  The Company
further  covenants  that all shares that may be issued upon the  exercise of the
rights represented by this Warrant and payment of the Exercise Price, all as set
<PAGE>
forth herein,  will be free from all taxes, liens, and charges in respect of the
issue  thereof   (other  than  taxes  in  respect  of  any  transfer   occurring
contemporaneously  or otherwise  specified herein).  The Company agrees that its
issuance of this Warrant shall  constitute  full authority to its officers,  who
are charged with the duty of executing stock certificates,  to execute and issue
the necessary  certificates for shares of Common Stock upon the exercise of this
Warrant.

                  4. No  Fractional  Shares or Scrip.  No  fractional  shares or
scrip  representing  fractional shares shall be issued upon the exercise of this
Warrant.  In lieu of any fractional share to which the Holder would otherwise be
entitled,  the Company  shall make a cash payment  equal to the  Exercise  Price
multiplied by such fraction.

                  5.  Rights of  Stockholders.  The Holder  shall not, by virtue
hereof, be entitled to any rights of a stockholder in the Company, either at law
or equity,  and the rights of the Holder are limited to those  expressed  in the
Warrant and are not  enforceable  against  the Company  except to the extent set
forth herein.

                  6.  Adjustments.  The Exercise  Price and the number of shares
purchasable hereunder are subject to adjustment from time to time as follows:

                  (a)  Reclassification,  etc.  If the Company at any time while
this Warrant,  or any portion thereof,  remains outstanding and unexpired shall,
by reclassification of securities or otherwise,  change any of the securities as
to which  purchase  rights under this Warrant exist into the same or a different
number  of  securities  of any  other  class  or  classes,  this  Warrant  shall
thereafter  represent the right to acquire such number and kind of securities as
would  have been  issuable  as the  result of such  change  with  respect to the
securities  which  were  subject  to the  purchase  rights  under  this  Warrant
immediately  prior to such  reclassification  or other  change and the  Exercise
Price  therefor  shall  be  appropriately   adjusted,  all  subject  to  further
adjustment as provided in this Section 6.

                  (b)  Split,  Subdivision  or  Combination  of  Shares.  If the
Company  at any  time  while  this  Warrant,  or any  portion  thereof,  remains
outstanding and unexpired shall split, subdivide or combine the securities as to
which  purchase  rights under this  Warrant  exist,  into a different  number of
securities  of the same  class,  the  number  of  securities  issuable  upon the
exercise   hereof  and  the  Exercise  Price  for  such   securities   shall  be
appropriately adjusted.

                  (c) Adjustments for Dividends in Stock or Other  Securities or
Property. If while this Warrant, or any portion hereof,  remains outstanding and
unexpired the holders of the securities as to which  purchase  rights under this
Warrant exist at the time shall have  received,  or, on or after the record date
fixed for the determination of eligible stockholders, shall have become entitled
to  receive,  without  payment  therefor,  other  or  additional  stock or other
securities or property (other than cash) of the Company by way of dividend, then
and in each case, this Warrant shall represent the right to acquire, in addition
to the  number  of shares  of the  security  receivable  upon  exercise  of this
Warrant,  and without  payment of any  additional  consideration  therefor,  the
amount of such other or additional  stock or other securities or property (other
than  cash) of the  Company  which  such  holder  would hold on the date of such
<PAGE>
exercise  had it been the  holder  of  record of the  security  receivable  upon
exercise  of this  Warrant  on the date  hereof and had  thereafter,  during the
period from the date hereof to and including the date of such exercise, retained
such shares  and/or all other  additional  stock  available  by it as  aforesaid
during such  period,  giving  effect to all  adjustments  called for during such
period by the provisions of this Section 6.

                  (d) Change of Control.  If at any time while this Warrant,  or
any portion  thereof,  remains  outstanding and  unexercised  there occurs (i) a
reorganization  of the  Company  (other  than a  combination,  reclassification,
exchange or subdivision of shares otherwise provided for herein); (ii) a merger,
consolidation or other corporate combination of the Company with or into another
corporation  in which the  Company  is not the  surviving  entity,  or a reverse
triangular merger in which the Company is the surviving entity but the shares of
the Company's  capital  stock  outstanding  immediately  prior to the merger are
converted, by virtue of the merger, into other property,  whether in the form of
securities,  cash,  or  otherwise;  or (iii) a sale or transfer of the Company's
properties and assets as, or substantially  as, an entirety to any other person,
this Warrant  shall  thereafter  represent  the right to acquire such number and
kind of  securities  as would  have  been  issuable  as the  result  of any such
transaction  with respect to the shares of Common Stock  subject to this Warrant
immediately  prior to such  transaction and the Exercise Price therefor shall be
appropriately  adjusted,  all subject to further  adjustment as provided in this
Section 6.

                  (e) Certificate as to Adjustments. Upon the occurrence of each
adjustment  or  readjustment  pursuant  to this  Section  6, the  Company at its
expense shall promptly  compute such  adjustment or  readjustment  in accordance
with the terms  hereof and furnish to Holder a  certificate  setting  forth such
adjustment  or  readjustment  and  showing  in detail  the facts upon which such
adjustment  or  readjustment  is based.  The  Company  shall,  upon the  written
request,  at any time,  of the Holder,  furnish or cause to be  furnished to the
Holder a like certificate setting forth: (i) such adjustments and readjustments;
(ii) the  Exercise  Price at the time in effect;  and (iii) the number of shares
and the amount,  if any, of other  property  which at the time would be received
upon the exercise of the Warrant.

                  (f) No  Impairment.  The Company  will not,  by any  voluntary
action, avoid or seek to avoid the observance or performance of any of the terms
to be observed or performed  hereunder by the Company,  but will at all times in
good faith assist in the carrying  out of all the  provisions  of this Section 6
and in the taking of all such action as may be necessary or appropriate in order
to protect the rights of the Holder against impairment.

                  7.  Exchange,  Transfer  or Loss of Warrant.  This  Warrant is
exchangeable,  without expense,  at the option of the Holder,  upon presentation
and surrender  hereof to the Company or at the office of its appointed  transfer
agent,  if any, for other  warrants of  different  denominations  entitling  the
Holder  thereof to purchase in the aggregate the same number of shares of Common
Stock purchasable hereunder.  This Warrant may be divided or combined with other
warrants which carry the same rights upon  presentation  hereof at the principal
office of the Company or at the office of its appointed  transfer agent, if any,
together with a written notice  specifying the names and  denominations in which
new  Warrants  are to be issued and signed by the  Holder.  Upon  receipt by the
Company  of  evidence  satisfactory  to it of the loss,  theft,  destruction  or
mutilation of this Warrant,  and (in the case of loss,  theft or destruction) of
reasonably satisfactory indemnification,  and upon surrender and cancellation of
this Warrant,  if mutilated,  the Company will execute and deliver a new Warrant
of like  tenor and date.  Any such new  Warrant  executed  and  delivered  shall
constitute  an  additional  contractual  obligation  on the part of the Company,
whether or not this Warrant so lost, stolen, destroyed, or mutilated shall be at
any time enforceable by anyone.
<PAGE>
                  8. Compliance with Securities Laws.

                  (a) This Warrant may not be  transferred  or assigned in whole
or in part without  compliance with all applicable  federal and state securities
laws by the transferor and the transferee  (including the delivery of investment
representation  letters  and  legal  opinions  reasonably  satisfactory  to  the
Company,  if such are  requested by the Company).  Subject to the  provisions of
this Warrant with respect to  compliance  with the  Securities  Act of 1933,  as
amended (the  "Securities  Act"),  title to this Warrant may be  transferred  by
endorsement  and  delivery  in  the  same  manner  as  a  negotiable  instrument
transferable by endorsement and delivery.

                  (b)  The  Holder  of  this  Warrant,   by  acceptance  hereof,
acknowledges that this Warrant, and the shares of Common Stock to be issued upon
exercise hereof,  are being acquired solely for the Holder's own account and not
as a nominee for any other party,  and for investment,  and that the Holder will
not offer,  sell,  or otherwise  dispose of this Warrant or any shares of Common
Stock to be issued upon exercise hereof except under circumstances that will not
result in a violation of the Securities Act or any state  securities  laws. Upon
exercise of this Warrant, the Holder shall, if requested by the Company, confirm
in writing,  in a form  satisfactory  to the Company,  that the shares of Common
Stock so purchased  are being  acquired  solely for the Holder's own account and
not as a nominee for any other party, for investment, and not with a view toward
distribution or resale.

                  (c) This  Warrant and all shares of Common  Stock  issued upon
exercise hereof shall be stamped or imprinted with a legend in substantially the
following form (in addition to any legend required by state securities laws):

                  THE  SECURITIES  REPRESENTED  HEREBY  HAVE BEEN  ACQUIRED  FOR
                  INVESTMENT AND HAVE NOT BEEN  REGISTERED  UNDER THE SECURITIES
                  ACT OF 1933, AS AMENDED. SUCH SECURITIES AND ANY SECURITIES OR
                  SHARES  ISSUED  HEREUNDER  OR  THEREUNDER  MAY  NOT BE SOLD OR
                  TRANSFERRED  IN  THE  ABSENCE  OF  SUCH   REGISTRATION  OR  AN
                  EXEMPTION  THEREFROM  UNDER SAID ACT.  COPIES OF THE AGREEMENT
                  COVERING  THE  PURCHASE OF THESE  SECURITIES  AND  RESTRICTING
                  THEIR  TRANSFER  OR SALE MAY BE OBTAINED AT NO COST BY WRITTEN
                  REQUEST MADE BY THE HOLDER OF RECORD  HEREOF TO THE  SECRETARY
                  OF THE  COMPANY  AT THE  PRINCIPAL  EXECUTIVE  OFFICES  OF THE
                  COMPANY.

                  9. Notices. In case (i) the Company shall take a record of the
holders of its Common Stock (or other stock or securities at the time receivable
upon the exercise of this Warrant) for the purpose of entitling  them to receive
any dividend or other  distribution,  or any right to subscribe  for or purchase
any  shares of stock of any class or any other  securities,  or to  receive  any
other  right;  (ii)  of  any  capital   reorganization   of  the  Company,   any
reclassification  of the capital  stock of the  Company,  any  consolidation  or
merger of the Company with or into another corporation, or any conveyance of all
or  substantially  all of the assets of the Company to another  corporation;  or
(iii) of any voluntary  dissolution,  liquidation  or winding-up of the Company,
then,  and in each such case, the Company will mail or cause to be mailed to the
Holder a notice  specifying,  as the case may be, (A) the date on which a record
is to be taken for the  purpose of such  dividend,  distribution  or right,  and
stating the amount and character of such dividend, distribution or right, or (B)
the date on which such reorganization, reclassification,  consolidation, merger,
<PAGE>
conveyance,  dissolution,  liquidation  or winding-up is to take place,  and the
time,  if any is to be fixed,  as of which the holders of record of Common Stock
(or such stock or  securities at the time  receivable  upon the exercise of this
Warrant)  shall be entitled to exchange  their  shares of Common  Stock (or such
other stock or securities)  for securities or other  property  deliverable  upon
such  reorganization,   reclassification,   consolidation,  merger,  conveyance,
dissolution,  liquidation  or  winding-up.  Such notice shall be mailed at least
fifteen (15) days prior to the date therein specified. All such notices, advices
and  communications  shall be deemed to have  been  received  (i) in the case of
personal delivery, on the date of such delivery and (ii) in the case of mailing,
on the third business day following the date of such mailing.

                  11.  Amendments.  Any term of this Warrant may be amended with
the written consent of the Company and the Holder.

                  IN WITNESS WHEREOF, EXOGEN, INC. has caused this Warrant to be
executed by its officers thereunto duly authorized.

Dated:  October 9, 1998

                                           EXOGEN, INC.


                                    By:    /s/  PATRICK A. McBRAYER
                                           ------------------------
                                    Name:  Patrick A. McBrayer
                                    Title: President and Chief Executive Officer


HOLDER:  Alessandro Chiabrera
<PAGE>
                               NOTICE OF EXERCISE

To:  EXOGEN, INC.

                  (1) The  undersigned  hereby  elects to purchase [ ] shares of
Common Stock of Exogen, Inc., pursuant to the terms of the attached Warrant, and
tenders herewith payment of the purchase price for such shares in full.

                  (2)  In  exercising  this  Warrant,   the  undersigned  hereby
confirms  and  acknowledges  that the shares of Common  Stock to be issued  upon
exercise hereof are being acquired solely for the account of the undersigned and
not as a  nominee  for  any  other  party,  and for  investment,  and  that  the
undersigned  will not offer,  sell,  or otherwise  dispose of any such shares of
Common Stock except under  circumstances  that will not result in a violation of
the Securities Act of 1933, as amended, or any state securities laws.

                  (3) Please issue a certificate  or  certificates  representing
said shares of Common Stock in the name of the undersigned or in such other name
as is specified below:


                                     __________________________________
                                     [Name]


                                     __________________________________
                                     [Name]


                  (4) Please issue a new Warrant for the unexercised  portion of
the attached  Warrant in the name of the undersigned or in such other name as is
specified below:


                                     __________________________________
                                     [Name]




                                     __________________________________
[Date]                                               [Signature]



                                                                    EXHIBIT 10.4
                                   EXHIBIT B



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



                          REGISTRATION RIGHTS AGREEMENT

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


                                 October 9, 1998



<PAGE>
                                TABLE OF CONTENTS

                                                                                

         1.       Registration Rights...........................................
                  1.1      Definitions..........................................
                  1.2      Shelf Registration...................................
                  1.3      Company Registration.................................
                  1.4      Obligations of the Company...........................
                  1.5      Furnish Information..................................
                  1.6      Expenses of Registration.............................
                  1.7      Expenses of Company Registration.....................
                  1.8      Underwriting Requirements............................
                  1.9      Delay of Registration................................
                  1.10     Indemnification......................................
                  1.11     Reports Under Securities Exchange Act of 1934........
                  1.12     Assignment of Registration Rights....................
                  1.13     Limitations on Subsequent Registration Rights........
                  1.14     "Market Stand-Off" Agreement.........................
                  1.15     No Required Sale.....................................

         2.       Miscellaneous.................................................
                  2.1      Successors and Assigns...............................
                  2.2      Governing Law........................................
                  2.3      Counterparts.........................................
                  2.4      Titles and Subtitles.................................
                  2.5      Notices..............................................
                  2.6      Expenses.............................................
                  2.7      Amendments and Waivers...............................
                  2.8      Severability.........................................
                  2.9      Nominees for Beneficial Owners.......................
                  2.10     Specific Performance.................................
                  2.11     No Inconsistent Agreements...........................
                  2.12     Entire Agreement.....................................
<PAGE>
                          REGISTRATION RIGHTS AGREEMENT


                  THIS  REGISTRATION  RIGHTS AGREEMENT is made as of the 9th day
of  October  1998 by and  between  Exogen,  Inc.,  a Delaware  corporation  (the
"Company"), and Alessandro Chiabrera (the "Warrant Holder").

                                    RECITALS

                  WHEREAS, the Company and the Warrant Holder are parties to the
Settlement Agreement of even date herewith (the "Settlement Agreement");

                  WHEREAS,  in order to induce  the  Company  to enter  into the
Settlement Agreement and to induce the Warrant Holder to agree to enter into the
Settlement Agreement,  the Warrant Holder and the Company hereby agree that this
Agreement  shall govern the rights of the Warrant Holder to cause the Company to
register the shares of Common Stock issuable to the Warrant Holder upon exercise
of the Warrant (as defined below) and certain other matters as set forth herein;

                  NOW, THEREFORE, THE PARTIES HEREBY AGREE AS FOLLOWS:

                  1.  Registration  Rights.  The Company covenants and agrees as
follows:

                           1.1 Definitions. For purposes of this Section 1:

                                    (a) The term "Act" means the  Securities Act
of 1933, as amended.

                                    (b) The terms  "Form  S-3"  means  such form
under the Act as in effect on the date hereof or any registration form under the
Act subsequently  adopted by the SEC which permits inclusion or incorporation of
substantial  information  by reference to other  documents  filed by the Company
with the SEC.

                                    (c) The term "register,"  "registered,"  and
"registration"  refer to a  registration  effected  by  preparing  and  filing a
registration statement or similar document in compliance with the Securities Act
of  1933,  as  amended  (the  "Act"),   and  the   declaration  or  ordering  of
effectiveness of such registration statement or document;

                                    (d) The term "Registrable  Securities" means
the Shares of Common Stock of the Company issued (or issuable) upon the exercise
of the Warrant, and (2) any shares of Common Stock issued as a dividend or other
distribution  with  respect to, or in exchange  for or in  replacement  of, such
Common Stock,  excluding in all cases, however, any Registrable Securities which
are sold, assigned,  pledged,  hypothecated or otherwise disposed of by a Holder
in a  transaction  in which such  Holder's  rights under this  Agreement are not
assigned or assignable;

                                    (e) The  number of  shares  of  "Registrable
Securities  then  outstanding"  shall be  determined  by the number of shares of
Common  Stock  outstanding  which are,  and the number of shares of Common Stock
issuable pursuant to then exercisable Warrant which are, Registrable Securities;

                                    (f) The  term  "Holder"  means  the  Warrant
Holder; and
<PAGE>
                                    (g) The term "Warrant"  means the Warrant to
purchase  45,000  shares of  Common  Stock  issued  pursuant  to the  Settlement
Agreement.

                           1.2      Shelf Registration.

                                    (a)  The  Company  shall,   subject  to  the
limitations  specified  in this  Agreement,  use its best  efforts (i) to file a
shelf  registration  statement  on Form S-3 or any other form  available  to the
Company  after two hundred  forty  (240) days from the date hereof (the  "Filing
Date") covering the  registration  under the Act of all  Registrable  Securities
then  outstanding  to be  offered or sold on a delayed  or  continuous  basis as
provided  by this  Agreement,  pursuant  to  Rule  415 of the  Act  (the  "Shelf
Registration  Statement");  and (ii) to maintain the  effectiveness of the Shelf
Registration  Statement  for a period  of five  (5)  years  from  the date  that
registration  statement  is declared  effective by the  Securities  and Exchange
Commission (or such shorter period in accordance with Section 1.4(a)).

                                    (b)  Notwithstanding  the foregoing,  if the
Company shall furnish to the Holder a certificate  signed by the Chief Executive
Officer or President of the Company  stating that, in the good faith judgment of
the Board of  Directors of the Company,  it would be  seriously  detrimental  (a
"Detrimental  Condition") to the Company and its stockholders for a registration
statement to be filed or to become or remain effective,  as the case may be, and
provided that the  Detrimental  Condition has not resulted from actions taken by
the Company,  (i) the Company  shall have the right to defer taking  action with
respect to the filing of the Shelf  Registration  Statement  for a period of not
more  than  ninety  (90)  days  after  the  Filing  Date,  (ii)  in case a Shelf
Registration Statement has been filed but has not become effective,  the Company
may cause such  registration  statement to be withdrawn or may postpone amending
or supplementing such registration statement until such Detrimental Condition no
longer exists,  but in no event for more than ninety (90) days, or (iii) in case
a Shelf  Registration  Statement  has been filed and has become  effective,  the
Company  may  cause  such  registration   statement  to  be  withdrawn  and  its
effectiveness   terminated  or  may  postpone  amending  or  supplementing  such
registration statement until such Detrimental Condition no longer exists, but in
no event  for more  than  ninety  (90)  days.  The  Company  may not  declare  a
Detrimental Condition, or take any of the actions specified in clauses (i), (ii)
or (iii) of the preceding  sentence (and can take only one such action specified
in clauses (i), (ii) or (iii) per Detrimental Condition),  more than once in any
twelve-month  period. The Company shall give written notice of its determination
to  postpone  or  withdraw  a  registration  statement  and of the fact that the
Detrimental  Condition for such  postponement or withdrawal no longer exists, in
each case,  promptly  after the  occurrence  thereof.  The  following  events or
circumstances  may  result  in the  filing  of a  registration  statement  being
seriously  detrimental to the Company and its  shareholders:  a pending material
acquisition,  merger  or sale or  purchase  of  assets,  pending  or  threatened
material  litigation,  pending or threatened material regulatory or governmental
action, pending material change in the business, prospects, condition (financial
or other) or properties of the Company.  The foregoing list is for  illustrative
purposes only and is not meant to be exclusive.
<PAGE>
                                    (c) If the Company  shall give any notice of
postponement or withdrawal of any registration statement, the Company shall not,
during the period of postponement or withdrawal pursuant to clauses (i), (ii) or
(iii) of the prior paragraph,  register any Common Stock, other than pursuant to
a registration statement on Form S-4 or S-8 (or an equivalent  registration form
then in effect). The Holder of Registrable  Securities agrees that, upon receipt
of any notice from the Company that the Company has  determined  to withdraw any
registration  statement  pursuant to the immediately  preceding  paragraph,  the
Holder will  discontinue its disposition of Registrable  Securities  pursuant to
such registration  statement and, if so directed by the Company, will deliver to
the Company (at the Company's  expense) all copies,  other than  permanent  file
copies,  then in Holder's possession of the prospectus covering such Registrable
Securities  that was in effect at the time of  receipt  of such  notice.  If the
Company shall have withdrawn or prematurely  terminated a registration statement
filed under this  Section 1.2  (whether  pursuant to the  immediately  preceding
paragraph,  or as a  result  of any stop  order,  injunction  or other  order or
requirement of the SEC or any other  governmental  agency or court), the Company
shall not be  considered  to have  effected an  effective  registration  for the
purposes of this Agreement until the Company shall have filed a new registration
statement   covering  the  Registrable   Securities  covered  by  the  withdrawn
registration  statement and such registration statement shall have been declared
effective  and shall not have been  withdrawn.  If the  Company  shall  give any
notice of withdrawal or  postponement of a registration  statement,  the Company
shall, at such time as the Detrimental  Condition that caused such withdrawal or
postponement no longer exists (but in no event later than ninety (90) days after
the date of the postponement or withdrawal),  use its best efforts to effect the
registration  under the Securities Act of the Registrable  Securities covered by
the  withdrawn  or postponed  registration  statement  in  accordance  with this
Section 1.2 (unless the Holder shall have withdrawn such request,  in which case
the Company shall not be  considered to have effected an effective  registration
for the purposes of this Agreement).

                                    (d)   The   registration   statement   filed
pursuant to this  Section 1.2 may include  other  securities  of the Company (i)
which are held by persons who, by virtue of  agreements  with the  Company,  are
entitled to include their  securities in any such  registration,  (ii) which are
held by officers and directors of the Company,  or (iii) which are being offered
for the  account of the Company  (collectively,  the  securities  referred to in
clauses (i), (ii) and (iii) in this paragraph are hereinafter referred to as the
"Other Securities").

                           1.3  Company   Registration.   If  (but  without  any
obligation  to do so) the  Company  proposes  to  register  (including  for this
purpose a registration  effected by the Company for stockholders  other than the
Holder) any of its stock or other  securities  under the Act in connection  with
the  public  offering  of  such  securities   solely  for  cash  (other  than  a
registration  relating  solely to the sale of  securities to  participants  in a
Company  stock  option,  stock  purchase  or  similar  plan  or a SEC  Rule  145
transaction, a registration on any form which does not include substantially the
same information as would be required to be included in a registration statement
covering the sale of the  Registrable  Securities or a registration in which the
only Common Stock being  registered is Common Stock issuable upon  conversion of
debt  securities  that are also being  registered),  the Company shall,  at such
time,  promptly give the Holder  written notice of such  registration.  Upon the
written  request of the Holder  given within  twenty (20) days after  mailing of
<PAGE>
such notice by the Company in  accordance  with Section 2.5, the Company  shall,
subject to the provisions of Section 1.8,  cause to be registered  under the Act
all  of  the  Registrable  Securities  that  the  Holder  has  requested  to  be
registered.  No registration effected pursuant to this Section 1.3 shall relieve
the Company of its obligations to effect the required  registration  pursuant to
Section  1.2.  The  Holder  shall have the right to  withdraw  his  request  for
inclusion of its Registrable  Securities in any registration  statement pursuant
to this  Section 1.3 by giving  written  notice to the Company of its request to
withdraw.

                           1.4  Obligations of the Company.  When required under
this Section 1 to effect the  registration  of the Registrable  Securities,  the
Company shall, as expeditiously as reasonably possible:

                                    (a) Prepare and file with the Securities and
Exchange   Commission  (the  "SEC")  a  Shelf  Registration   Statement  or,  if
applicable,  any other form of registration  statement, as the case may be, with
respect to the  Registrable  Securities  and use its best  efforts to cause such
registration  statement to become effective within one hundred twenty (120) days
after such registration  statement was filed and to keep such Shelf Registration
Statement  effective for a period up to the fifth anniversary of the date hereof
or until the earlier of (i) completion of the  distribution  contemplated in the
Shelf Registration  Statement has been completed,  and (ii) when all Registrable
Securities may be sold without  restriction under Rule 144 promulgated under the
Act provided, however, that before filing a registration statement or prospectus
or any  amendments  or  supplements  thereto,  or  comparable  statements  under
securities  or blue sky laws of any  jurisdiction,  the Company  will furnish to
counsel for the Holder (the  "Holder's  Counsel")  participating  in the planned
offering (selected by the Holder),  and the underwriters,  if any, copies of all
such  documents  proposed to be filed  (including all exhibits  thereto),  which
documents  will be subject to the reasonable  review and  reasonable  comment of
such counsel.

                                    (b)  Prepare  and  file  with  the SEC  such
amendments  and  supplements to such  registration  statement and the prospectus
used in  connection  with such  registration  statement  as may be  necessary to
comply with the  provisions  of the Act with respect to the  disposition  of all
securities covered by such registration statement.

                                    (c) Furnish to the Holder whose  Registrable
Securities  are  covered by the Shelf  Registration  Statement  such  numbers of
copies of a prospectus,  including a preliminary prospectus,  in conformity with
the  requirements  of the Act, and such other  documents as they may  reasonably
request in order to facilitate the disposition of Registrable  Securities  owned
by them.

                                    (d) Use its best  efforts  to  register  and
qualify the securities  covered by such registration  statement under such other
securities  or Blue  Sky  laws of such  jurisdictions  as  shall  be  reasonably
requested by the Holder whose  Registrable  Securities  are covered by the Shelf
Registration  Statement;  provided  that the  Company  shall not be  required in
connection  therewith or as a condition  thereto to qualify to do business or to
file a general consent to service of process in any such states or jurisdictions
unless the Company is already subject to service in such jurisdiction.
<PAGE>
                                    (e) In the event the Registrable  Securities
are to be sold through an underwritten  public offering under Section 1.3, enter
into and perform its obligations under an underwriting  agreement,  in usual and
customary  form,  with the managing  underwriter  of such  offering.  The Holder
proposing to distribute  Registrable Securities through such underwritten public
offering  shall also  enter into and  perform  their  obligations  under such an
agreement.  No offering  pursuant to a registration  statement under Section 1.2
shall be an underwritten offering.

                                    (f) In the event the Registrable  Securities
are to be sold through an  underwritten  public  offering under Section 1.3, use
its best efforts to furnish,  on the date that such  Registrable  Securities are
delivered  to the  underwriters  for  sale  in  connection  with a  registration
pursuant  to this  Section 1, (i) an  opinion,  dated such date,  of the counsel
representing  the Company for the  purposes  of such  registration,  in form and
substance as is customarily  given to  underwriters  in an  underwritten  public
offering,  addressed to the  underwriters,  and (ii) a letter,  dated such date,
from the independent  certified public  accountants of the Company  addressed to
the  underwriters,   stating  that  such  accountants  are  independent   public
accountants within the meaning of the Act and the applicable published rules and
regulations thereunder, and otherwise in form and in substance as is customarily
given by independent  certified public accountants to underwriters in connection
with an underwritten public offering.

                                    (g) Promptly  notify (i) the Holder  selling
Registrable  Securities covered by such registration statement and each managing
underwriter,  if any: (A) when the registration statement, the prospectus or any
prospectus  supplement  related  thereto  or  post-effective  amendment  to  the
registration  statement  has been filed and,  with  respect to the  registration
statement or any post-effective  amendment,  when the same has become effective,
(B) of the issuance by the SEC of any stop order suspending the effectiveness of
the  registration  statement  or the  initiation  of any  proceedings  for  that
purpose,  (C) of the receipt by the Company of any notification  with respect to
the suspension of the qualification of any Registrable Securities for sale under
the  securities or blue sky laws of any  jurisdiction  or the  initiation of any
proceeding  for  such  purpose,  and  (D)  when  a  prospectus  relating  to the
registration  statement  is  required  to be  delivered  under  the  Act  of the
happening  of any  event as a result of which the  prospectus  included  in such
registration  statement,  as then in effect,  includes an untrue  statement of a
material fact or omits to state a material fact required to be stated therein or
necessary  to make the  statements  therein not  misleading  in the light of the
circumstances  then  existing;  and (ii)  Holder's  Counsel  and  each  managing
underwriter  of any request by the SEC for  amendments  or  supplements  to such
registration   statement  or  prospectus   related  thereto  or  for  additional
information. If the notification relates to an event described in clause (i)(D),
the Company  shall,  in  accordance  with  paragraph  (b) of this  Section  1.4,
promptly  prepare  and  furnish to the  Holder  selling  Registrable  Securities
covered by such registration statement and each managing underwriter, if any, in
a registration  under Section 1.3 a reasonable  number of copies of a prospectus
supplemented  or amended so that, as thereafter  delivered to the  purchasers of
such  Registrable  Securities,  such  prospectus  shall  not  include  an untrue
statement  of a material  fact or omit to state a material  fact  required to be
stated therein or necessary to make the  statements  therein in the light of the
circumstances under which they were made not misleading.
<PAGE>                  
                                    (h)  Cooperate  with the  selling  Holder of
Registrable  Securities and the managing underwriter,  if any, in a registration
under  Section  1.3  to  facilitate  the  timely  preparation  and  delivery  of
certificates  not bearing any restrictive  legends  representing the Registrable
Securities  to be sold,  and cause such  Registrable  Securities to be issued in
such  denominations  and  registered  in  such  names  in  accordance  with  the
underwriting  agreement  prior  to any  sale of  Registrable  Securities  to the
underwriters  or,  if not an  underwritten  offering,  in  accordance  with  the
instructions  of the selling  Holder of  Registrable  Securities  at least three
business  days prior to any sale of  Registrable  Securities  and  instruct  any
transfer  agent and  registrar  of  Registrable  Securities  to release any stop
transfer orders in respect thereto.

                                    (i)  Comply  with all  applicable  rules and
regulations of the SEC, and make generally available to its security holders, as
soon as  reasonably  practicable  after the effective  date of the  registration
statement (and in any event within 16 months thereafter),  an earnings statement
(which need not be audited)  covering the period of at least twelve  consecutive
months  beginning  with the first day of the Company's  first  calendar  quarter
after the effective date of the registration statement, which earnings statement
shall satisfy the provisions of Section 11(a) of the Securities Act and Rule 158
thereunder.

                                    (j)   (i)   Cause   all   such   Registrable
Securities covered by such registration  statement to be listed on the principal
securities  exchange on which similar  securities issued by the Company are then
listed (if any), if the listing of such Registrable Securities is then permitted
under the rules of such exchange,  or (ii) if no similar  securities are then so
listed,  to  either  cause  all such  Registrable  Securities  to be listed on a
national  securities  exchange or to secure  designation of all such Registrable
Securities as a National  Association  of  Securities  Dealers,  Inc.  Automated
Quotation System ("NASDAQ") "national market system security" within the meaning
of  Rule  11Aa2-1  of  the  Exchange  Act  or,   failing  that,   secure  NASDAQ
authorization  for such shares  and,  without  limiting  the  generality  of the
foregoing, take all actions that may be required by the Company as the issuer of
such  Registrable  Securities in order to facilitate the managing  underwriter's
arranging  for the  registration  of at least  two  market  makers  as such with
respect to such shares with the National Association of Securities Dealers, Inc.
(the "NASD").

                                    (k)  Provide  and cause to be  maintained  a
transfer agent and registrar for all such Registrable Securities covered by such
registration  statement not later than the effective  date of such  registration
statement.

                                    (l) Deliver promptly to Holder's Counsel and
each underwriter,  if any, copies of all correspondence  between the SEC and the
Company,  its counsel or auditors and all memoranda relating to discussions with
the SEC or its staff with  respect  to the  registration  statement,  other than
those  portions  of any such  memoranda  which  contain  information  subject to
attorney-client privilege with respect to the Company, and, upon receipt of such
confidentiality   agreements  as  the  Company  may  reasonably  request,   make
reasonably available for inspection by Holder's Counsel, by any underwriter,  if
any,   participating  in  any  disposition  to  be  effected  pursuant  to  such
registration  statement  if  such  registration  is  under  Section  1.3 and any
<PAGE>
attorney,  accountant  or other  agent  retained  by any such  underwriter,  all
pertinent  financial  and  other  records,  pertinent  corporate  documents  and
properties of the Company,  and cause all of the Company's  officers,  directors
and employees to supply all information reasonably requested by Holder's Counsel
or such  underwriter,  attorney,  accountant  or agent in  connection  with such
registration statement.

                                    (m) Use  reasonable  best  efforts to obtain
the withdrawal of any order  suspending the  effectiveness  of the  registration
statement.


                                    (n) Upon  written  request,  furnish  to the
Holder  participating  in the  offering and the  managing  underwriter,  without
charge,  at least  one  conformed  copy of the  registration  statement  and any
post-effective amendments thereto, including financial statements and schedules,
all  documents  incorporated  therein by reference  and all exhibits  (including
those incorporated by reference).

                                    (o)  Take  all   such   other   commercially
reasonable  actions  as are  necessary  or  advisable  in order to  expedite  or
facilitate the disposition of such Registrable Securities.

                           1.5  Furnish  Information.  It shall  be a  condition
precedent to the  obligations of the Company to take any action pursuant to this
Section  1 with  respect  to the  Registrable  Securities  of the  Holder  whose
Registrable  Securities are covered by the Shelf Registration Statement that the
Holder shall  furnish to the Company such  information  regarding  himself,  the
Registrable  Securities  held by him, and the intended  method of disposition of
such securities as shall be required to effect the registration of such Holder's
Registrable Securities.

                           1.6 Expenses of Registration.

                                    (a)  Subject to Section  1.6(c),  "Expenses"
shall mean any and all fees and expenses  incident to the Company's  performance
of or compliance with this Section 1, including,  without  limitation:  (i) SEC,
stock  exchange or NASD  registration  and filing fees and all listing  fees and
fees with  respect to the  inclusion  of  securities  in  NASDAQ,  (ii) fees and
expenses  of  compliance  with  state  securities  or  "blue  sky"  laws  and in
connection  with the  preparation  of a "blue  sky"  survey,  including  without
limitation, reasonable fees and expenses of blue sky counsel, (iii) printing and
copying expenses, (iv) messenger and delivery expenses, (v) expenses incurred in
connection  with any road show, (vi) fees and  disbursements  of counsel for the
Company, (vii) with respect to each registration,  the fees and disbursements of
one counsel for the selling  Holder  (selected by the  Holder),  (viii) fees and
disbursements of the Company's  independent  public  accountants  (including the
expenses of any audit  and/or  "cold  comfort"  letter) and fees and expenses of
other persons, including special experts, retained by the Company, (ix) any fees
and expenses  payable to a Qualified  Independent  Underwriter  (as such term is
defined in Conduct Rule 2720 of the National  Association of Securities Dealers,
Inc.'s By-Laws) and (x) any other fees and  disbursements  of  underwriters,  if
any,  customarily  paid by  issuers  or  sellers  of  securities  (collectively,
"Expenses").

                                    (b) The Company  shall pay all Expenses with
respect  to any  registration  pursuant  to  Section  1.2,  whether  or not such
registration  statement  becomes  effective or remains  effective for the period
contemplated by Section 1.2(a).
<PAGE>
                                    (c) Notwithstanding  the foregoing,  (i) the
provisions of this Section 1.6 shall be deemed  amended to the extent  necessary
to cause these  expense  provisions to comply with "blue sky" laws of each state
in which the offering is made and (ii) in connection with any registration under
Section  1,  the  selling  Holder  shall  pay  all  underwriting  discounts  and
commissions  and any transfer  taxes,  if any,  attributable to the sale of such
Registrable  Securities,  and  (iii)  the  Company  shall,  in the  case  of all
registrations under this Section 1, be responsible for all its internal expenses
(including,  without  limitation,  all salaries and expenses of its officers and
employees performing legal or accounting duties).

                           1.7  Expenses  of Company  Registration.  The Company
shall bear and pay all Expenses  incurred in connection  with any  registration,
filing  or  qualification   of  Registrable   Securities  with  respect  to  the
registrations  pursuant  to  Section  1.3 for the  Holder  (which  right  may be
assigned as provided in Section 1.12).

                           1.8 Underwriting Requirements. In connection with any
offering involving an underwriting of shares of the Company's capital stock, the
Company  shall not be required  under Section 1.3 to include any of the Holder's
securities in such underwriting unless they accept the terms of the underwriting
as agreed upon  between the Company and the  underwriters  selected by it (or by
other  persons  entitled  to  select  the  underwriters),  and then only in such
quantity  as the  underwriters  determine  in  their  sole  discretion  will not
jeopardize  the success of the offering by the  Company.  If the total amount of
securities,  including Registrable  Securities,  requested by stockholders to be
included in such offering  exceeds the amount of  securities  sold other than by
the  Company  that the  underwriters  determine  in  their  sole  discretion  is
compatible with the success of the offering,  then the Company shall be required
to  include  in the  offering  only that  number of such  securities,  including
Registrable Securities, that the underwriters determine in their sole discretion
will not jeopardize  the success of the offering (the  securities so included to
be apportioned  pro rata among the selling  stockholders  according to the total
amount of  securities  entitled to be  included  therein  owned by each  selling
stockholder or in such other  proportions as shall mutually be agreed to by such
selling  stockholders,  but in any event subject to the apportionment  rights of
certain  selling  stockholders  under  Section  1.8 of the  Registration  Rights
Agreement,   dated   October   20,   1997,   between  the  Company  and  certain
stockholders).   For  purposes  of  the   preceding   parenthetical   concerning
apportionment,  for any  selling  stockholder  that is a Holder  of  Registrable
Securities and that is a partnership or corporate partners, retired partners and
stockholders  of such  Holder,  or the  estates  and family  members of any such
partners  and  retired  partners  and any trusts  for the  benefit of any of the
foregoing persons shall be deemed to be a single "selling  stockholder," and any
pro-rata  reduction  with respect to such "selling  stockholder"  shall be based
upon the aggregate  amount of shares carrying  registration  rights owned by all
entities and individuals  included in such "selling  stockholder," as defined in
this sentence.

                           1.9 Delay of Registration.  The Holder shall not have
any right to obtain or seek an injunction  restraining or otherwise delaying any
such registration as the result of any controversy that might arise with respect
to the interpretation or implementation of this Section 1.

                           1.10  Indemnification.  In the event any  Registrable
Securities are included in a registration statement under this Section 1:
<PAGE>
                                    (a) To the  extent  permitted  by  law,  the
Company will indemnify and hold harmless the Holder whose Registrable Securities
are covered by the Registration Statement, its directors, officers, fiduciaries,
employees and  stockholders  or general or limited  partners (and the directors,
officers,  employees and stockholders  thereof),  any underwriter (as defined in
the Act) for such Holder and each person,  if any,  who controls  such Holder or
underwriter  within the  meaning of the Act or the  Securities  Exchange  Act of
1934, as amended (the "1934 Act"), each officer, director, employee, stockholder
or  partner  of such  underwriter,  against  any  losses,  claims,  damages,  or
liabilities  (joint or several) or actions or proceedings  (whether commenced or
threatened) and expenses  (including  reasonable fees of counsel and any amounts
paid in any settlement effected with the Company's  consent),  to which they may
become subject under the Act, the 1934 Act or any state  securities law, insofar
as such losses,  claims,  damages,  or liabilities (or actions or proceedings in
respect  thereof)  ("Claims") or expenses  arise out of or are based upon any of
the following statements,  omissions or violations (collectively a "Violation"):
(i) any  untrue  statement  or  alleged  untrue  statement  of a  material  fact
contained in such registration statement,  including any preliminary prospectus,
summary  prospectus or final prospectus  contained  therein or any amendments or
supplements thereto,  together with documents incorporated by reference therein,
(ii) the omission or alleged  omission to state therein a material fact required
to  be  stated  therein,  or  necessary  to  make  the  statements  therein  not
misleading,  or (iii) any  violation or alleged  violation by the Company of the
Act,  the  1934  Act,  any  state  securities  law or  any  rule  or  regulation
promulgated  under the Act,  the 1934 Act or any state  securities  law; and the
Company will pay to such Holder, and each such underwriter or controlling person
any legal or other  expenses  reasonably  incurred  by them in  connection  with
investigating or defending any such loss, claim, damage,  liability,  expense or
action  or  proceeding;  provided,  however,  that (A) the  indemnity  agreement
contained in this Section 1.10 shall not apply to amounts paid in  settlement of
any such Claim if such settlement is effected without the consent of the Company
(which consent shall not be unreasonably withheld), (B) the Company shall not be
liable in any case for any such Claim to the extent  that it arises out of or is
based upon a Violation  which  occurs in reliance  upon and in  conformity  with
written  information  furnished  expressly  for  use  in  connection  with  such
registration by the Holder, or any such underwriter or controlling  person. Such
indemnity and  reimbursement  of expenses  shall remain in full force and effect
regardless of any  investigation  made by as on behalf of such indemnified party
and shall survive the transfer of such securities by such Holder.

                                    (b) To the  extent  permitted  by  law,  the
Holder  whose  Registrable  Securities  are  covered  by the Shelf  Registration
Statement  will,  severally  and not jointly,  indemnify  and hold  harmless the
Company,  each  of its  directors,  each of its  officers  who  has  signed  the
registration statement, each person, if any, who controls the Company within the
meaning of the Act,  any  underwriter,  and any  controlling  person of any such
underwriter,  against any losses,  claims,  damages,  or  liabilities  (joint or
several) to which any of the  foregoing  persons may become  subject,  under the
Act, or the 1934 Act,  insofar as such Claim  arises out of or is based upon any
Violation,  in each  case to the  extent  (and  only to the  extent)  that  such
Violation  occurs in reliance  upon and in conformity  with written  information
furnished by such Holder expressly for use in connection with such registration;
and such Holder will pay, as incurred,  any legal or other  expenses  reasonably
incurred by any person intended to be indemnified pursuant to this Section 1.10,
in connection with investigating or defending any such Claim; provided, however,
<PAGE>
that the indemnity  agreement  contained in this Section 1.10 shall not apply to
amounts  paid in  settlement  of any such Claim if such  settlement  is effected
without the consent of such  Holder,  which  consent  shall not be  unreasonably
withheld; provided that, in no event shall any indemnity under this Section 1.10
exceed  the net  proceeds  from  the  offering  received  by such  Holder.  Such
indemnity and  reimbursement  of expenses  shall remain in full force and effect
regardless of any  investigation  made by as on behalf of such indemnified party
and shall survive the transfer of such securities by such Holder.

                                    (c) Promptly after receipt by an indemnified
party  under  this  Section  1.10 of notice of the  commencement  of any  action
(including any governmental  action), such indemnified party will, if a claim in
respect thereof is to be made against any indemnifying  party under this Section
1.10,  deliver to the  indemnifying  party a written notice of the  commencement
thereof and the indemnifying  party shall have the right to participate in, and,
to the  extent  the  indemnifying  party so  desires,  jointly  with  any  other
indemnifying party similarly noticed, to assume the defense thereof with counsel
mutually  satisfactory to the parties;  provided,  however,  that an indemnified
party  (together  with all other  indemnified  parties which may be  represented
without  conflict by one  counsel)  shall have the right to retain one  separate
counsel, with the fees and expenses to be paid by the indemnifying party, (i) if
representation  of  such  indemnified  party  by  the  counsel  retained  by the
indemnifying  party would be inappropriate due to actual or potential  differing
interests between such indemnified party and any other party represented by such
counsel  in  such  proceeding;  (ii) if the  indemnifying  party  fails  to take
reasonable steps necessary to defend  diligently the action or proceeding within
30 days after  receiving  notice from such  indemnified  party; or (iii) if such
indemnified  party who is a defendant in any action or proceeding  which is also
brought  against the  indemnifying  party  reasonably  shall have concluded that
there may be one or more legal  defenses  available  to such  indemnified  party
which are not  available  to the  indemnifying  party.  The  failure  to deliver
written  notice  to the  indemnifying  party  within  a  reasonable  time of the
commencement  of any such action,  if  prejudicial to its ability to defend such
action,   shall  relieve  such  indemnifying  party  of  any  liability  to  the
indemnified  party  under this  Section  1.10,  but the  omission  so to deliver
written  notice to the  indemnifying  party will not relieve it of any liability
that it may have to any  indemnified  party  otherwise  than under this  Section
1.10.

                                    (d) If the  indemnification  provided for in
this Section 1.10 is held by a court of competent jurisdiction to be unavailable
to an  indemnified  party  with  respect  to any Claim or  expense  referred  to
therein,  then the indemnifying  party, in lieu of indemnifying such indemnified
party  hereunder,  shall  contribute  to the  amount  paid  or  payable  by such
indemnified  party as a result of such Claim or expense in such proportion as is
appropriate to reflect the relative fault of the  indemnifying  party on the one
hand and of the indemnified party on the other in connection with the statements
or  omissions  that  resulted  in such  Claim or  expense  as well as any  other
relevant equitable considerations.  The relative fault of the indemnifying party
and of the  indemnified  party shall be  determined by reference to, among other
things, whether the untrue or alleged untrue statement of a material fact or the
omission  to state a  material  fact  relates  to  information  supplied  by the
indemnifying party or by the indemnified party and the parties' relative intent,
knowledge,  access to  information,  and  opportunity to correct or prevent such
statement  or  omission.  If,  however,  the  allocation  provided  in the first
sentence  of this  paragraph  is not  permitted  by  applicable  law,  then each
indemnifying  party  shall  contribute  to the  amount  paid or  payable by such
indemnified  party in such proportion as is appropriate to reflect not only such
<PAGE>
relative faults but also the relative benefits of the indemnifying party and the
indemnified party as well as any other relevant  equitable  considerations.  The
parties  hereto agree that it would not be just and  equitable if  contributions
pursuant to this Section 1.10(d) were to be determined by pro rata allocation or
by any other method of  allocation  which does not take account of the equitable
considerations  referred to in the preceding  sentences of this Section 1.10(d).
The amount  paid or  payable in respect of any Claim  shall be deemed to include
any legal or other expenses  reasonably  incurred by such  indemnified  party in
connection  with  investigating  or defending  such Claim.  No person  guilty of
fraudulent  misrepresentation  (within  the  meaning  of  Section  11(f)  of the
Securities  Act) shall be entitled to  contribution  from any person who was not
guilty of such fraudulent  misrepresentation.  Notwithstanding  anything in this
Section 1.10(d) to the contrary,  no indemnifying party (other than the Company)
shall be required  pursuant to this Section  1.10(d) to contribute any amount in
excess of the net proceeds received by such indemnifying  party from the sale of
Registrable  Securities  in the offering to which the Claims of the  indemnified
parties  relate,  less the amount of any  indemnification  payment  made by such
indemnifying party pursuant to Sections 1.10(b).

                                    (e)  Notwithstanding  the foregoing,  to the
extent that the provisions on indemnification and contribution  contained in the
underwriting  agreement entered into in connection with the underwritten  public
offering are in conflict with the foregoing  provisions,  the  provisions in the
underwriting agreement shall control.

                                    (f)  The  obligations  of  the  Company  and
Holder under this Section 1.10 shall  survive the  completion of any offering of
Registrable  Securities in a  registration  statement  under this Section 1, and
otherwise.

                           1.11 Reports Under  Securities  Exchange Act of 1934.
With a view  to  making  available  to the  Holder  the  benefits  of  Rule  144
promulgated  under the Act and any other rule or  regulation of the SEC that may
at any time  permit  Holder to sell  securities  of the  Company  to the  public
without  registration  or pursuant to a  registration  on Form S-3,  the Company
agrees to:

                                    (a)  make  and   keep   public   information
available,  as those  terms are  understood  and defined in SEC Rule 144, at all
times;

                                    (b) take  such  action  as is  necessary  to
maintain  the  Holder's  ability  to  utilize  Form  S-3 for the  sale of  their
Registrable Securities;

                                    (c) file with the SEC in a timely manner all
reports and other  documents  required of the Company under the Act and the 1934
Act; and

                                    (d) furnish to the Holder, so long as Holder
owns any Registrable Securities,  forthwith upon request (i) a written statement
by the Company that it has complied with the reporting  requirements of SEC Rule
144, the Act and the 1934 Act (at any time after it so  qualifies),  (ii) a copy
of the most  recent  annual or  quarterly  report of the  Company and such other
reports and  documents  filed by the Company  with the SEC, and (iii) such other
information as may be reasonably requested in availing the Holder of any rule or
regulation of the SEC which permits the selling of any such  securities  without
registration or pursuant to such form.
<PAGE>
                           1.12 Assignment of Registration Rights.

                                    (a) The  rights  to  cause  the  Company  to
register Registrable  Securities pursuant to this Section 1 may be assigned (but
only with all related obligations) by the Holder to a transferee or assignees of
such  securities  provided:  (i) the Company is, within a reasonable  time after
such  transfer,  furnished  with written  notice of the name and address of such
transferee  or  assignee  and  the   securities   with  respect  to  which  such
registration rights are being assigned;  (ii) such transferee or assignee agrees
in  writing  to be bound by and  subject  to the  terms and  conditions  of this
Agreement,  including, without limitation, the provisions of Section 1.14 below;
and (iii) such  assignment  shall be effective  only if such  transfer is exempt
from  registration  under the Act. For the purposes of determining the number of
shares of Registrable  Securities held by a transferee or assignee,  the holding
of  transferees  and  assignees  of a  partnership  who are  partners or retired
partners  of  such  partnership   (including   spouses  and  ancestors,   lineal
descendants  and  siblings of such  partners or spouses who acquire  Registrable
Securities by gift, will or intestate  succession) shall be aggregated  together
with the partnership;  provided that all assignees and transferees who would not
qualify  individually for assignment of registration  rights shall have a single
attorney-in-fact for the purpose of exercising any rights,  receiving notices or
taking any action under this Section 1.

                                    (b)  Subject to clause (a) above,  the right
to have the Company register the Registrable Securities pursuant to this Section
1 may not  otherwise be assigned;  provided,  however,  that (i) any heir or the
estate of the Holder which acquires the  Registrable  Securities from the Holder
by will or intestate  succession  shall be entitled to have the Company register
the Registrable  Securities pursuant to this Section 1 (provided that such heirs
or  such  estate  shall  have a  single  attorney-in-fact  for  the  purpose  of
exercising  any rights,  receiving  any notices or taking any action  under this
Section 1), and (ii) Holder may sell, assign or transfer Registrable  Securities
to his or her spouse or  children or to a trust  established  for the benefit of
his or her spouse,  children or himself or herself, and such transferee shall be
entitled to have the Company  register the  Registrable  Securities  pursuant to
this Section 1, if, and only if, such  transferee  agrees in writing to be bound
by the terms of this  Agreement.  In each such  event and for  purposes  of this
Agreement,  the term "Holder" as used herein shall include all such heirs,  such
estate or such transferees.

                           1.13 Limitations on Subsequent  Registration  Rights.
From and after the date of this  Agreement,  the Company shall not,  without the
prior written consent of the Holder, enter into any agreement with any holder or
prospective holder of any securities of the Company that would allow such holder
or prospective holder to include such securities in any registration filed under
Section 1.2 hereof,  unless  under the terms of such  agreement,  such holder or
prospective  holder may include such securities in any such registration only to
the extent that the  inclusion of his  securities  will not reduce the amount of
the Registrable Securities of the Holder that is included.

                           1.14 "Market Stand-Off" Agreement.  The Holder hereby
agrees  that,  during the period of  duration  specified  by the  Company and an
underwriter  of Common Stock or other  securities of the Company,  following the
effective date of a  registration  statement of the Company filed under the Act,
he shall not,  to the extent  requested  by the  Company  and such  underwriter,
directly or indirectly sell, offer to sell, contract to sell (including, without
limitation,  any short sale), grant any option to purchase or otherwise transfer
<PAGE>
or  dispose  of (other  than to  donees  who agree to be  similarly  bound)  any
securities  of the Company  held by it at any time  during  such  period  except
Common Stock included in such registration,  and the Holder agrees to enter into
an agreement to such effect with such underwriter;  provided,  however, that (a)
all officers and  directors of the Company enter into similar  agreements,  and,
(b) such  market  stand-off  time  period  shall not  exceed  120  days.  If the
underwriters agree to any waivers of such restrictions, then the Holder shall be
entitled to sell, transfer or dispose of the same number or amount of securities
of the  Company as the person or entity  receiving  such  waiver,  upon the same
terms and conditions set forth in such waiver.

                           In order  to  enforce  the  foregoing  covenant,  the
Company may impose  stop-transfer  instructions  with respect to the Registrable
Securities  of the Holder (and the shares or  securities  of every other  person
subject to the foregoing restriction) until the end of such period.

                           1.15 No  Required  Sale.  Nothing  in this  Agreement
shall be deemed to create  an  independent  obligation  on the part of Holder to
sell  any  Registrable   Securities  pursuant  to  any  effective   registration
statement.

                  2.       Miscellaneous.

                           2.1  Successors  and  Assigns.  Except  as  otherwise
provided  herein,  and provided that the transfer or assignment is in accordance
with the terms hereof, the terms and conditions of this Agreement shall inure to
the benefit of and be binding upon the respective  successors and assigns of the
parties  (including  any  permitted  transferees  of any  shares of  Registrable
Securities).  Nothing in this  Agreement,  express or  implied,  is  intended to
confer  upon  any  party  other  than the  parties  hereto  or their  respective
successors and assigns any rights, remedies,  obligations,  or liabilities under
or by reason of this Agreement, except as expressly provided in this Agreement.

                           2.2 Governing Law. This  Agreement  shall be governed
by and  construed  under  the laws of the  State of New York  without  regard to
principles of conflicts or choice of laws.

                           2.3  Counterparts.  This Agreement may be executed in
two or more counterparts,  each of which shall be deemed an original, but all of
which together shall constitute one and the same instrument.

                           2.4 Titles and  Subtitles.  The titles and  subtitles
used  in  this  Agreement  are  used  for  convenience  only  and  are not to be
considered in construing or interpreting this Agreement.

                           2.5 Notices.  Unless otherwise  provided,  any notice
required or permitted  under this Agreement  shall be given in writing and shall
be deemed  effectively  given upon personal delivery to the party to be notified
or upon deposit with the United  States Post Office,  by registered or certified
mail,  postage  prepaid and addressed to the party to be notified at the address
indicated for such party in the Settlement  Agreement,  or at such other address
as such party may  designate  by ten (10) days'  advance  written  notice to the
other parties.
<PAGE>
                           2.6  Expenses.  If any  action at law or in equity is
necessary to enforce or interpret the terms of this  Agreement,  the  prevailing
party shall be entitled  to  reasonable  attorneys'  fees,  costs and  necessary
disbursements  in  addition  to any  other  relief  to which  such  party may be
entitled.

                           2.7  Amendments   and  Waivers.   Any  term  of  this
Agreement may be amended and the observance of any term of this Agreement may be
waived (either generally or in a particular instance and either retroactively or
prospectively), only with the written consent of the Company and the Holder. Any
amendment  or waiver  effected  in  accordance  with this  Section  2.7 shall be
binding upon the Holder of any  Registrable  Securities then  outstanding,  each
future Holder of all such Registrable Securities, and the Company.

                           2.8  Severability.  If one or more provisions of this
Agreement are held to be  unenforceable  under  applicable  law, such  provision
shall be excluded from this Agreement and the balance of the Agreement  shall be
interpreted  as if such  provision  were so excluded and shall be enforceable in
accordance with its terms.

                           2.9 Nominees for  Beneficial  Owners.  If Registrable
Securities  are  held  by a  nominee  for  the  beneficial  owner  thereof,  the
beneficial  owner  thereof may, at its option,  be treated as the Holder of such
Registrable Securities for purposes of any request or other action by the Holder
or the Holder of  Registrable  Securities  pursuant  to this  Agreement  (or any
determination  of any number or  percentage of shares  constituting  Registrable
Securities  held  by  the  Holder  or  the  Holder  of  Registrable   Securities
contemplated by this  Agreement),  provided that the Company shall have received
assurances reasonably satisfactory to it of such beneficial ownership.

                           2.10  Specific   Performance.   The  parties   hereto
acknowledge  that there would be no adequate remedy at law if any party fails to
perform any of its obligations hereunder, and accordingly agree that each party,
in addition to any other remedy to which it may be entitled at law or in equity,
shall be entitled to  injunctive  relief,  including  specific  performance,  to
enforce  such  obligations  without the posting of any bond,  and, if any action
should be brought in equity to enforce any of the provisions of this  Agreement,
none of the parties  hereto  shall  raise the defense  that there is an adequate
remedy at law.

                           2.11 No Inconsistent  Agreements.  The rights granted
to the Holder of  Registrable  Securities  hereunder  do not in any way conflict
with and are not inconsistent  with any other agreements to which the Company is
a party or by which it is  bound.  Without  the  prior  written  consent  of the
Holder,  neither the Company nor any Holder  will,  on or after the date of this
Agreement,  enter into any  agreement  with respect to its  securities  which is
inconsistent  with the rights granted in this  Agreement or otherwise  conflicts
with  the  provisions  hereof,   other  than  any  lock-up  agreement  with  the
underwriters  in connection  with any registered  offering  effected  hereunder,
pursuant to which the Company  shall  agree not to  register  for sale,  and the
Company  shall agree not to sell or  otherwise  dispose of,  Common Stock or any
securities convertible into or exercisable or exchangeable for Common Stock, for
a specified period following the registered offering. The Company further agrees
that if any other  registration  rights agreement entered into after the date of
this Agreement  with respect to any of its  securities  contains terms which are
more  favorable  to, or less  restrictive  on, the other party  thereto than the
terms and  conditions in this  Agreement are (insofar as they are  applicable to
the Holder),  then the terms and conditions of this Agreement shall  immediately
be deemed to have been  amended  without  further  action by the  Company or the
Holder of  Registrable  Securities  so that the Holder  shall be entitled to the
benefit of any such more favorable or less restrictive terms or conditions.

                           2.12 Entire Agreement.  This Agreement (including the
Exhibits  hereto,  if any)  constitutes  the full and entire  understanding  and
agreement between the parties with regard to the subjects hereof and thereof.
<PAGE>
                  IN  WITNESS   WHEREOF,   the  parties   have   executed   this
Registration Rights Agreement as of the date first above written.


EXOGEN, INC.



                                    By:    /s/  PATRICK A. McBRAYER
                                           ------------------------
                                    Name:  Patrick A. McBrayer
                                    Title: President and Chief Executive Officer

                                    Address:      10 Constitution Avenue
                                                  P.O. Box 6860
                                                  Piscataway, NJ 08855


                                    WARRANTHOLDER:




                                           /s/DR. ALESSANDRO CHIABRERA
                                           ---------------------------
                                           Dr. Alessandro Chiabrera

                                                                    EXHIBIT 10.5
                                    EXHIBIT C

                                 PROMISSORY NOTE


         In consideration  of, and in connection with, the Settlement  Agreement
and Mutual Release entered into as of September 30, 1998, by and among plaintiff
Exogen Inc., ("Exogen") and defendants,  Pilla Consulting,  Inc., ("Consulting")
and Arthur A. Pilla,  ("Pilla") Arthur A. Pilla as Third Party Plaintiff against
the Third Party Defendants, Interpore International, ("Interpore") and Interpore
Orthopaedics ("IOI"),  (the "Settlement  Agreement"),  the undersigned,  Exogen,
whose  current  business  address  is 10  Constitution  Avenue,  P.O.  Box 6860,
Piscataway, NJ 08855, promises to pay to the order of Consulting,  the principal
amount of Seventy Six Thousand  Three  Hundred Sixty Four Dollars and Twenty One
Cents ($76,364.21) in installments,  as set forth in Schedule 1 attached hereto,
and made a part hereof.  All payments shall be made to Pilla  Consulting,  Inc.,
care of 133 Heights Road, Ridgewood,  New Jersey 07450, or at such other address
as designated by Consulting in writing to Exogen.

 UNCONDITIONAL RIGHT TO PAYMENT

         The obligation of Exogen to pay each and every  installment  under this
Promissory Note is unconditional  and irrevocable and the right of Consulting to
receive each and every payment hereunder is uncontestable.

         Exogen  shall not have any right of offset with respect to any payments
due hereunder and Exogen hereby waives any defenses or counterclaims which would
result in a right of offset.

EVENTS OF DEFAULT

         The  occurrence  of any of the  following  events shall be considered a
default in the obligations under this Promissory Note ("Events of Default"):

         (a)      Failure to timely pay any  installment set forth on Schedule 1
                  annexed  hereto.  Subject  to  paragraph  5 of the  Settlement
                  Agreement, a payment shall be timely if received by Consulting
                  on or before the due date set forth in Schedule 1; or

         (b)      Failure by Exogen to observe or perform  any of the  covenants
                  or agreements in the Settlement Agreement; or

         (c)      A decree  or order by a court  adjudging  Exogen  bankrupt  or
                  insolvent, or approving, as properly filed, a petition seeking
                  reorganization   of   Exogen's   affairs   under  the  federal
                  bankruptcy code or any other similar federal, state or foreign
                  law, which is not dismissed within 60 days of filing; or

         (d)      A decree or order of a court for the appointment of a receiver
                  or trustee or assignee in bankruptcy or insolvency for Exogen,
                  or for the winding-up or liquidation of the affairs of Exogen;
                  or

         (e)      Exogen  institutes  proceedings  to be adjudicated a voluntary
                  bankrupt  or  consents  to  the  institution  of a  bankruptcy
                  proceedings  or files a petition or answer or consent  seeking
                  reorganization  or  rearrangement  with  creditors  under  any
                  federal  or a state or  foreign  bankruptcy  act or any  other
                  similar federal or state law or

         (f)      Exogen  makes an  assignment  for the benefit of  creditors or
                  admits in writing an inability to pay debts  generally as they
                  become due; or
<PAGE>
         (g)      The agreement by Exogen to any merger,  buy-out,  acquisition,
                  asset sale transaction or other corporate event resulting in a
                  change of control which is not conditioned  upon the acquiring
                  entity  assuming  Exogen's  obligations  under this Promissory
                  Note.

         Upon the occurrence of any of the above events of default, and upon ten
(10)  days  written  notice  to Exogen in  accordance  with  paragraph  5 of the
Settlement  Agreement,  all payments set forth on Schedule 1, which have not yet
been made, shall become immediately due and payable without presentment,  demand
or notice of any kind,  all of which are hereby  expressly  waived,  anything in
this Promissory Note to the contrary notwithstanding. Upon the expiration of the
ten (10) day notice  period,  Consulting  shall have the right to  institute  an
action  against  Exogen for all payments set forth on Schedule 1, which have not
yet been made,  with interest  thereon at the rate of 9% per annum from the date
of  commencement  of the action.  Exogen shall be liable for and pay any and all
attorneys' fees incurred by Consulting in such an action.

PREPAYMENTS

         Exogen  shall  have the right to  pre-pay  the  unpaid  balance of this
Promissory Note without penalty upon 10 days written notice to Consulting.

MERGER OR CONSOLIDATION

         The  obligations  of Exogen  hereunder  shall extend to, and be binding
upon,  each of its  successors,  assigns,  any corporation of which it owns more
than 50% of the voting stock, and the transferee of all, or  substantially  all,
of Exogen's assets.

Dated: September 30, 1998

                               EXOGEN, INC.



                               By:     /s/  RICHARD H. REISNER
                                       -----------------------
                               Name:   Richard H. Reisner
                               Title: Vice President and Chief Financial Officer



                                                                    EXHIBIT 10.6

  THIS WARRANT HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 AND MAY
   NOT BE SOLD, OFFERED FOR SALE, PLEDGED OR HYPOTHECATED IN THE ABSENCE OF A
      REGISTRATION STATEMENT IN EFFECT WITH RESPECT TO THE SECURITIES UNDER
     SUCH ACT OR AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH
                         REGISTRATION IS NOT REQUIRED.

No. CSPW-E02

              Void after 5:00 p.m. New York Time, on July 20, 2003
                        (subject to certain exceptions)
       Warrant to Purchase Eighty Thousand (80,000) Shares of Common Stock

                        WARRANT TO PURCHASE COMMON STOCK
                                       OF
                                  EXOGEN, INC.


                  This certifies that, for value received,  Arthur A. Pilla (the
"Holder"),  is entitled,  subject to the terms set forth below, to purchase from
Exogen, Inc., a Delaware  corporation (the "Company"),  Eighty Thousand (80,000)
fully paid,  validly  issued and  nonassessable  shares of the Company's  common
stock,  $.0001 par value per share (the "Common Stock"),  upon surrender hereof,
at the  principal  office of the Company  referred to below,  with the Notice of
Exercise  annexed hereto duly executed,  and  simultaneous  payment  therefor in
lawful  money of the United  States or  otherwise as  hereinafter  provided,  at
$3.12,  the Average Closing Sale Price of Exogen's Common Stock between June 16,
1998 and July 16, 1998, as quoted on the Nasdaq  National  Market (the "Exercise
Price"). The number, character and Exercise Price of such shares of Common Stock
are subject to adjustment as provided  below.  The term "Warrant" as used herein
shall  include  this  Warrant and any  warrants  delivered  in  substitution  or
exchange therefor as provided herein.  

                  1. Term of Warrant.  Subject to the terms and  conditions  set
forth  herein,  this Warrant shall be  exercisable,  in whole or in part, at any
time or from time to time on or after the date the Settlement  Agreement entered
into in conjunction herewith is executed and ending at 5:00 p.m., New York Time,
on July 20, 2003 and shall be void thereafter. 

                  2. Exercise of Warrant.

                           (a) The purchase  rights  represented by this Warrant
are  exercisable  by the Holder in whole or in part, at any time or from time to
time,  during the term hereof as described in Section 1 above,  by the surrender
of this Warrant and the Notice of Exercise  annexed  hereto duly  completed  and
executed  on behalf of the  Holder,  at the office of the Company (or such other
office or agency of the Company as it may  designate by notice in writing to the
Holder at the address of the Holder appearing on the books of the Company), upon
payment in cash or by check acceptable to the Company.

                  In lieu of paying the purchase price in cash or by check,  the
Holder may elect to receive  shares of Common  Stock  equal to the value of this
Warrant (or the portion  thereof  being  exercised),  in which event the Company
shall  issue to the Holder the number of shares of the  Company's  Common  Stock
computed using the following formula:

                                   X = Y (A-B)
                                   -----------
                                        A

                 Where:

                 X  -   the number of shares of Common Stock subject to this 
                        Warrant to be issued to the Holder;
<PAGE>
                 Y  -   the  number of shares of Common  Stock  subject  to
                        this Warrant otherwise purchasable under this Warrant
                        (at the date of such calculation);

                 A  -   the  Market  Price of one  share  of the  Company's
                        Common Stock (at the date of such calculation); and

                 B  -   Exercise   Price  (as  adjusted  to  the  date  of  such
                        calculation).

                  For  purposes of the  foregoing  calculation,  "Market  Price"
shall mean the last reported  sales prices regular way, or in case no such sales
take place on such day,  the average of the  closing bid and ask prices  regular
way,  of the  Company's  Common  Stock in each  case on the  principal  national
securities exchange on which the security is listed or admitted to trading,  or,
if not listed or admitted to trading on any national securities exchange, on the
Nasdaq  National  Market  or, if the  Company's  Common  Stock is not  listed or
admitted to trading on any national securities exchange and is not quoted on the
Nasdaq  National  Market,  the  average  of the  closing  bid and ask  prices as
furnished by any New York Stock Exchange  member firm selected from time to time
by the Board of  Directors  of the Company for such  purpose.  

                           (b)  This  Warrant  shall  be  deemed  to  have  been
exercised  immediately  prior  to the  close  of  business  on the  date  of its
surrender for exercise as provided above, and the person entitled to receive the
shares of Common  Stock  issuable  upon such  exercise  shall be treated for all
purposes  as the holder of record of such  shares as of the close of business on
such date. As promptly as  practicable  on or after such date,  and in any event
within ten (10) days  thereafter,  the Company at its  expense,  shall issue and
deliver to the person or persons  entitled to receive the same, a certificate or
certificates for the number of shares issuable upon such exercise.  In the event
that this Warrant is exercised in part,  the Company at its expense will execute
and deliver a new Warrant of like tenor exercisable for the number of shares for
which this Warrant may then be exercised.

                  3.  Reservation of Shares.  The Company  covenants that during
the term  this  Warrant  is  exercisable,  the  Company  will  reserve  from its
authorized  and unissued  Common Stock a sufficient  number of shares to provide
for the issuance of Common Stock upon the exercise of this Warrant.  The Company
further  convents  that all shares that may be issued  upon the  exercise of the
rights represented by this Warrant and payment of the Exercise Price, all as set
forth herein,  will be free from all taxes, liens, and charges in respect of the
issue  thereof   (other  than  taxes  in  respect  of  any  transfer   occurring
contemporaneously  or otherwise  specified herein).  The Company agrees that its
issuance of this Warrant shall  constitute  full authority to its officers,  who
are charged with duty of executing stock certificates,  to execute and issue the
necessary  certificates  for shares of Common  Stock upon the  exercise  of this
Warrant.

                  4. No  Fractional  Shares or Scrip.  No  fractional  shares or
scrip  representing  fractional shares shall be issued upon the exercise of this
Warrant.  In lieu of any fractional share to which the Holder would otherwise be
entitled,  the Company  shall make a cash payment  equal to the  Exercise  Price
multiplied by such fraction.
<PAGE>
                  5.  Rights of  Stockholders.  The Holder  shall not, by virtue
hereof, be entitled to any rights of a stockholder in the Company, either at law
or equity,  and the rights of the Holder are limited to those  expressed  in the
Warrant and are not  enforceable  against  the Company  except to the extent set
forth herein.


                  6.  Adjustments.  The Exercise  Price and the number of shares
purchasable hereunder are subject to adjustment from time to time as follows:

                           (a) Reclassification, etc. If the Company at any time
while this Warrant,  or any portion thereof,  remains  outstanding and unexpired
shall,  by  reclassification  of  securities  or  otherwise,  change  any of the
securities as to which purchase rights under this Warrant exist into the same or
a different  number of  securities  of any other class or classes,  this Warrant
shall  thereafter  represent  the  right  to  acquire  such  number  and kind of
securities as would have been issuable as the result of such change with respect
to the securities  which were subject to the purchase  rights under this Warrant
immediately  prior to such  reclassification  or other  change and the  Exercise
Price  therefor  shall  be  appropriately   adjusted,  all  subject  to  further
adjustment as provided in this Section 6.

                           (b) Split,  Subdivision or Combination of Shares.  If
the  Company at any time while this  Warrant,  or any portion  thereof,  remains
outstanding and unexpired shall split, subdivide or combine the securities as to
which  purchase  rights under this  Warrant  exist,  into a different  number of
securities  of the same  class,  the  number  of  securities  issuable  upon the
exercise   hereof  and  the  Exercise  Price  for  such   securities   shall  be
appropriately adjusted.

                           (c)  Adjustments  for  Dividends  in  Stock  or Other
Securities or Property.  If while this Warrant,  or any portion hereof,  remains
outstanding  and  unexpired the holder of the  securities  as to which  purchase
rights under this Warrant exist at the time shall have received, or, on or after
the record date fixed for the determination of eligible stockholders, shall have
become entitled to receive,  without payment therefor, other or additional stock
or other  securities  or  property  (other  than cash) of the  Company by way of
dividend,  then and in each case,  this  Warrant  shall  represent  the right to
acquire,  in addition to the number of shares of the  security  receivable  upon
exercise of this Warrant,  and without  payment of any additional  consideration
therefor,  the amount of such other or additional  stock or other  securities or
property  (other than cash) of the Company  which such holder  would hold on the
date  of  such  exercise  had it been  the  holder  of  record  of the  security
receivable  upon exercise of this Warrant on the date hereof and had thereafter,
during  the  period  from  the date  hereof  to and  including  the date of such
exercise, retained such shares and/or all other additional stock available by it
as aforesaid  during such period,  giving effect to all  adjustments  called for
during such period by the provisions of this Section 6.

                           (d)  Change of  Control.  If at any time  while  this
Warrant,  or any portion  thereof,  remains  outstanding and  unexercised  there
occurs  (i)  a  reorganization   of  the  Company  (other  than  a  combination,
reclassification,  exchange or  subdivision  of shares  otherwise  provided  for
herein);  (ii) a merger,  consolidation  or other  corporate  combination of the
Company  with or into  another  corporation  in  which  the  Company  is not the
surviving  entity,  or a reverse  triangular  merger in which the company is the
surviving  entity  but the shares of the  Company's  capital  stock  outstanding
immediately  prior to the merger are  converted,  by virtue of the merger,  into
<PAGE>
other property, whether in the form of securities,  cash, or otherwise; or (iii)
a sale or transfer of the Company's  properties and assets as, or  substantially
as, an entirety to any other person, this Warrant shall thereafter represent the
right to acquire such number and kind of  securities as would have been issuable
as the result of any such transaction with respect to the shares of Common Stock
subject to this Warrant  immediately  prior to such transaction and the Exercise
Price  therefor  shall  be  appropriately   adjusted,  all  subject  to  further
adjustment as provided in this Section 6.

                           (e)   Certificate   as  to   Adjustments.   Upon  the
occurrence of each  adjustment or  readjustment  pursuant to this Section 6, the
Company at its expense shall promptly compute such adjustment or readjustment in
accordance  with the terms  hereof and furnish to Holder a  certificate  setting
forth such adjustment or readjustment and showing in detail the facts upon which
such adjustment or readjustment  is based.  The Company shall,  upon the written
request,  at any time,  of the Holder,  furnish or cause to be  furnished to the
Holder a like certificate setting forth; (i) such adjustments and readjustments;
(ii) the  Exercise  Price at the time in effect;  and (iii) the number of shares
and the amount,  if any, of other  property  which at the time would be received
upon the exercise of the Warrant.

                           (f) No  Impairment.  The  Company  will  not,  by any
voluntary action, avoid or seek to avoid the observance or performance of any of
the terms to be observed or performed hereunder by the Company,  but will at all
times in good faith  assist in the carrying  out of all the  provisions  of this
Section  6 and in the  taking  of  all  such  action  as  may  be  necessary  or
appropriate in order to protect the rights of the Holder against impairment.

                  7.  Exchange,  Transfer  or Loss of Warrant.  This  Warrant is
exchangeable,  without expense,  at the option of the Holder,  upon presentation
and surrender  hereof to the Company or at the office of its appointed  transfer
agent,  if any, for other  warrants of  different  denominations  entitling  the
Holder  thereof to purchase in the aggregate the same number of shares of Common
Stock purchasable hereunder.  This Warrant may be divided or combined with other
warrants which carry the same rights upon  presentation  hereof at the principal
office of the Company or at the office of its appointed  transfer agent, if any,
together with a written notice  specifying the names and  denominations in which
new  Warrants  are to be issued and signed by the  Holder.  Upon  receipt by the
Company  of  evidence  satisfactory  to it of the loss,  theft,  destruction  or
mutilation of this Warrant,  and (in the case of loss,  theft or destruction) of
reasonably satisfactory indemnification,  and upon surrender and cancellation of
this Warrant,  if mutilated,  the Company will execute and deliver a new Warrant
of like  tenor and date.  Any such new  Warrant  executed  and  delivered  shall
constitute  an  additional  contractual  obligation  on the part of the Company,
whether or not this Warrant so lost, stolen, destroyed, or mutilated shall be at
any time enforceable by anyone.

                  8. Compliance with Securities Law.

                           (a) This Warrant may not be  transferred  or assigned
in whole or in part without  compliance  with all  applicable  federal and state
securities laws by the transferor and the transferee  (including the delivery of
investment  representation letters and legal opinions reasonably satisfactory to
the Company, if such are requested by the Company). Subject to the provisions of
this Warrant with respect to  compliance  with the  Securities  Act of 1933,  as
amended (the  "Securities  Act"),  title to this Warrant may be  transferred  by
endorsement  and  delivery  in  the  same  manner  as  a  negotiable  instrument
transferable by endorsement and delivery.
<PAGE>
                           (b) The Holder of this Warrant, by acceptance hereof,
acknowledges that this Warrant, and the shares of Common Stock to be issued upon
exercise hereof,  are being acquired solely for the Holder's own account and not
as a nominee for any other party,  and for investment,  and that the Holder will
not offer,  sell,  or otherwise  dispose of this Warrant or any shares of Common
Stock to be issued upon exercise hereof except under circumstances that will not
result in a violation of the Securities Act or any state  securities  laws. Upon
exercise of this Warrant, the Holder shall, if requested by the Company, confirm
in writing,  in a form  satisfactory  to the Company,  that the shares of Common
Stock so purchased  are being  acquired  solely for the Holder's own account and
not as a nominee for any other party, for investment, and not with a view toward
distribution  or resale. 

                           (c) This  Warrant  and all  shares  of  Common  Stock
issued  upon  exercise  hereof  shall be stamped or  imprinted  with a legend in
substantially  the following  form (in addition to any legend  required by state
securities laws):

                  THE  SECURITIES  REPRESENTED  HEREBY  HAVE BEEN  ACQUIRED  FOR
                  INVESTMENT AND HAVE NOT BEEN  REGISTERED  UNDER THE SECURITIES
                  ACT OF 1933, AS AMENDED. SUCH SECURITIES AND ANY SECURITIES OR
                  SHARES  ISSUED  HEREUNDER  OR  THEREUNDER  MAY  NOT BE SOLD OR
                  TRANSFERRED  IN  THE  ABSENCE  OF  SUCH   REGISTRATION  OR  AN
                  EXEMPTION  THEREFROM  UNDER SAID ACT.  COPIES OF THE AGREEMENT
                  COVERING  THE  PURCHASE OF THESE  SECURITIES  AND  RESTRICTING
                  THEIR  TRANSFER  OR SALE MAY BE OBTAINED AT NO COST BY WRITTEN
                  REQUEST MADE BY THE HOLDER OF RECORD  HEREOF TO THE  SECRETARY
                  OF THE  COMPANY  AT THE  PRINCIPAL  EXECUTIVE  OFFICES  OF THE
                  COMPANY.

                  9. Notices. In case (i) the Company shall take a record of the
holders of its Common Stock (or other stock or securities at the time receivable
upon the exercise of this Warrant) for the purpose of entitling  them to receive
any dividend or other  distribution,  or any right to subscribe  for or purchase
any  shares of stock of any class or any other  securities,  or to  receive  any
other  right;  (ii)  of  any  capital   reorganization   of  the  Company,   any
reclassification  of the capital  stock of the  Company,  any  consolidation  or
merger of the Company with or into another corporation, or any conveyance of all
or  substantially  all of the assets of the Company to another  corporation;  or
(iii) of any voluntary  dissolution,  liquidation  or winding-up of the Company,
then,  and in each such case, the Company will mail or cause to be mailed to the
Holder a notice  specifying,  as the case may be, (A) the date on which a record
is to be taken for the  purpose of such  dividend,  distribution  or right,  and
stating the amount and character of such dividend, distribution or right, or (B)
the date on which such reorganization, reclassification,  consolidation, merger,
conveyance,  dissolution,  liquidation  or winding-up is to take place,  and the
time,  if any is to be fixed,  as of which the holders of record of Common Stock
(or such stock or  securities at the time  receivable  upon the exercise of this
Warrant)  shall be entitled to exchange  their  shares of Common  Stock (or such
other stock or securities)  for securities or other  property  deliverable  upon
such  reorganization,   reclassification,   consolidation,  merger,  conveyance,
dissolution,  liquidation  or  winding-up.  Such notice shall be mailed at least
fifteen (15) days prior to the date therein specified. All such notices, advices
and  communications  shall be deemed to have  been  received  (i) in the case of
personal delivery, on the date of such delivery and (ii) in the case of mailing,
on the third business day following the date of such mailing.

                  10.  Amendments.  Any term of this Warrant may be amended with
the written consent of the Company and the Holder.
<PAGE>
                  IN WITNESS WHEREOF, EXOGEN, INC. has caused this Warrant to be
executed by its officers thereunto duly authorized.

Dated: September 30, 1998

                                                EXOGEN, INC.


                                                 By:    /s/Richard H. Reisner
                                                        ---------------------
                                                 Name:  Richard H. Reisner
                                                 Title: Vice-President and Chief
                                                        Financial Officer

HOLDER:  Arthur A. Pilla
<PAGE>
                               NOTICE OF EXERCISE


To:      EXOGEN, INC.

                  (1) The  undersigned  hereby  elects to purchase [ ] shares of
Common Stock of Exogen, Inc. pursuant to the terms of the attached Warrant,  and
tenders herewith payment of the purchase price for such shares in full.

                  (2)  In  exercising  this  Warrant,   the  undersigned  hereby
confirms  and  acknowledges  that the shares of Common  Stock to be issued  upon
exercise hereof are being acquired solely for the account of the undersigned and
not as a  nominee  for  any  other  party,  and for  investment,  and  that  the
undersigned  will not offer,  sell,  or otherwise  dispose of any such shares of
Common Stock except under  circumstances  that will not result in a violation of
the Securities Act of 1933, as amended, or any state securities laws.

                  (3) Please issue a certificate  or  certificates  representing
said shares of Common Stock in the name of the undersigned or in such other name
as is specified below:

                                     ________________________ 
                                     [Name]


                                     ________________________
                                     [Name]

                  (4) Please issue a new Warrant for the unexercised  portion of
the attached  Warrant in the name of the undersigned or in such other name as is
specified below:


                                     ________________________
                                     [Name]


                                     ________________________

_________________                    ________________________
[Date]                                    [Signature]


                                                                    EXHIBIT 10.7
- --------------------------------------------------------------------------------


                          REGISTRATION RIGHTS AGREEMENT


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

                               September 30, 1998


<PAGE>

                                TABLE OF CONTENTS


                                                                                

1.       Registration Rights....................................................
         1.1      Definitions...................................................
         1.2      Shelf Registration............................................
         1.3      Company Registration..........................................
         1.4      Obligations of the Company....................................
         1.5      Furnish Information...........................................
         1.6      Expenses of Registration......................................
         1.7      Expenses of Company Registration..............................
         1.8      Underwriting Requirements.....................................
         1.9      Delay of Registration.........................................
         1.10     Indemnification...............................................
         1.11     Reports Under Securities Exchange Act of 1934.................
         1.12     Assignment of Registration Rights.............................
         1.13     Limitations on Subsequent Registration Rights.................
         1.14     "Market Stand-Off" Agreement..................................
         1.15     No Required Sale..............................................

2.       Miscellaneous..........................................................
         2.1      Successors and Assigns........................................
         2.2      Governing Law.................................................
         2.3      Counterparts..................................................
         2.4      Titles and Subtitles..........................................
         2.5      Notices.......................................................
         2.6      Expenses......................................................
         2.7      Amendments and Waivers........................................
         2.8      Severability..................................................
         2.9      Nominees for Beneficial Owners................................
         2.10     Specific Performance..........................................
         2.11     No Inconsistent Agreements....................................
         2.12     Entire Agreement..............................................
<PAGE>
                          REGISTRATION RIGHTS AGREEMENT


                  THIS REGISTRATION  RIGHTS AGREEMENT is made as of the 30th day
of September,  1998 by and between  Exogen,  Inc., a Delaware  corporation  (the
"Company"), and Arthur A. Pilla (the "Warrant Holder").

                                    RECITALS

                  WHEREAS, the Company and the Warrant Holder are parties to the
Settlement Agreement of even date herewith (the "Settlement Agreement");

                  WHEREAS,  in order to induce  the  Company  to enter  into the
Settlement Agreement and to induce the Warrant Holder to agree to enter into the
Settlement Agreement,  the Warrant Holder and the Company hereby agree that this
Agreement  shall govern the rights of the Warrant Holder to cause the Company to
register the shares of Common Stock issuable to the Warrant Holder upon exercise
of the Warrant (as defined below) and certain other matters as set forth herein;

                  NOW, THEREFORE, THE PARTIES HEREBY AGREE AS FOLLOWS:

                  1.  Registration  Rights.  The Company covenants and agrees as
follows:

                  1.1 Definitions. For purposes of this Section 1:

                           (a) The term "Act" means the  Securities Act of 1933,
as amended.

                           (b) The terms  "Form  S-3"  means such form under the
Act as in  effect  on the date  hereof or any  registration  form  under the Act
subsequently  adopted by the SEC which  permits  inclusion or  incorporation  of
substantial  information  by reference to other  documents  filed by the Company
with the SEC.

                           (c)   The   term   "register,"    "registered,"   and
"registration"  refer to a  registration  effected  by  preparing  and  filing a
registration statement or similar document in compliance with the Securities Act
of  1933,  as  amended  (the  "Act"),   and  the   declaration  or  ordering  of
effectiveness of such registration statement or document;

                           (d) The term  "Registrable  Securities" means (1) the
Shares of Common Stock of the Company  issued (or issuable) upon the exercise of
the  Warrant,  and (2) any shares of Common  Stock issued as a dividend or other
distribution  with  respect to, or in exchange  for or in  replacement  of, such
Common Stock,  excluding in all cases, however, any Registrable Securities which
are sold, assigned, pledged, hypothecated or otherwise disposed of by the Holder
in a  transaction  in which such  Holder's  rights under this  Agreement are not
assigned or assignable;

                           (e) The number of shares of  "Registrable  Securities
then  outstanding"  shall be  determined by the number of shares of Common Stock
outstanding  which  are,  and the  number of shares  of  Common  Stock  issuable
pursuant to the then exercisable Warrant which are, Registrable Securities;

                           (f) The term "Holder" means the Warrant Holder; and

                           (g) The term "Warrant"  means the Warrant to purchase
80,000 shares of Common Stock issued pursuant to the Settlement Agreement.
<PAGE>
                  1.2 Shelf Registration.

                           (a) The  Company  shall,  subject to the  limitations
specified  in  this  Agreement,  use  its  best  efforts  (i) to  file  a  shelf
registration  statement  on Form S-3 or any other form  available to the Company
after two hundred  forty (240) days from the date  hereof  (the  "Filing  Date")
covering  the  registration  under the Act of all  Registrable  Securities  then
outstanding  to be offered or sold on a delayed or continuous  basis as provided
by this  Agreement,  pursuant  to Rule 415 of the Act (the  "Shelf  Registration
Statement");  and (ii) to maintain the  effectiveness of the Shelf  Registration
Statement  for a period  of five (5)  years  from  the  date  that  registration
statement is declared  effective by the Securities  and Exchange  Commission (or
such shorter period in accordance with Section 1.4(a)).

                           (b)  Notwithstanding  the  foregoing,  if the Company
shall furnish to the Holder a certificate  signed by the Chief Executive Officer
or  President of the Company  stating  that,  in the good faith  judgment of the
Board  of  Directors  of the  Company,  it  would be  seriously  detrimental  (a
"Detrimental  Condition") to the Company and its stockholders for a registration
statement to be filed or to become or remain effective,  as the case may be, and
provided that the  Detrimental  Condition has not resulted from actions taken by
the Company,  (i) the Company  shall have the right to defer taking  action with
respect to the filing of the Shelf  Registration  Statement  for a period of not
more  than  ninety  (90)  days  after  the  Filing  Date,  (ii)  in case a Shelf
Registration Statement has been filed but has not become effective,  the Company
may cause such  registration  statement to be withdrawn or may postpone amending
or supplementing such registration statement until such Detrimental Condition no
longer exists,  but in no event for more than ninety (90) days, or (iii) in case
a Shelf  Registration  Statement  has been filed and has become  effective,  the
Company  may  cause  such  registration   statement  to  be  withdrawn  and  its
effectiveness   terminated  or  may  postpone  amending  or  supplementing  such
registration statement until such Detrimental Condition no longer exists, but in
no event  for more  than  ninety  (90)  days.  The  Company  may not  declare  a
Detrimental Condition, or take any of the actions specified in clauses (i), (ii)
or (iii) of the preceding  sentence (and can take only one such action specified
in clauses (i), (ii) or (iii) per Detrimental Condition),  more than once in any
twelve-month  period. The Company shall give written notice of its determination
to  postpone  or  withdraw  a  registration  statement  and of the fact that the
Detrimental  Condition for such  postponement or withdrawal no longer exists, in
each case,  promptly  after the  occurrence  thereof.  The  following  events or
circumstances  may  result  in the  filing  of a  registration  statement  being
seriously  detrimental to the Company and its  stockholders:  a pending material
acquisition,  merger  or sale or  purchase  of  assets,  pending  or  threatened
material  litigation,  pending or threatened material regulatory or governmental
action, pending material change in the business, prospects, condition (financial
or other) or properties of the Company.  The foregoing list is for  illustrative
purposes only and is not meant to be exclusive.

                           (c)  If  the   Company   shall  give  any  notice  of
postponement or withdrawal of any registration statement, the Company shall not,
during the period of postponement or withdrawal pursuant to clauses (i), (ii) or
(iii) of the prior paragraph,  register any Common Stock, other than pursuant to
a registration statement on Form S-4 or S-8 (or an equivalent  registration form
then in effect). The Holder of Registrable  Securities agrees that, upon receipt
of any notice from the Company that the Company has  determined  to withdraw any
registration  statement  pursuant to the immediately  preceding  paragraph,  the
Holder will  discontinue its disposition of Registrable  Securities  pursuant to
<PAGE>
such registration  statement and, if so directed by the Company, will deliver to
the Company (at the Company's  expense) all copies,  other than  permanent  file
copies,  then  in the  Holder's  possession  of  the  prospectus  covering  such
Registrable Securities that was in effect at the time of receipt of such notice.
If the Company shall have  withdrawn or  prematurely  terminated a  registration
statement  filed under this  Section 1.2  (whether  pursuant to the  immediately
preceding paragraph, or as a result of any stop order, injunction or other order
or  requirement  of the SEC or any  other  governmental  agency or  court),  the
Company shall not be considered to have effected an effective  registration  for
the  purposes  of this  Agreement  until  the  Company  shall  have  filed a new
registration  statement  covering  the  Registrable  Securities  covered  by the
withdrawn registration statement and such registration statement shall have been
declared effective and shall not have been withdrawn.  If the Company shall give
any notice of  withdrawal  or  postponement  of a  registration  statement,  the
Company  shall,  at such time as the  Detrimental  Condition  that  caused  such
withdrawal or  postponement  no longer exists (but in no event later than ninety
(90)  days  after  the date of the  postponement  or  withdrawal),  use its best
efforts to effect the  registration  under the Securities Act of the Registrable
Securities  covered by the  withdrawn  or  postponed  registration  statement in
accordance  with this Section 1.2 (unless the Holder shall have  withdrawn  such
request,  in which case the Company  shall not be considered to have effected an
effective registration for the purposes of this Agreement).

                           (d) The registration statement filed pursuant to this
Section 1.2 may include  other  securities  of the Company (i) which are held by
persons who, by virtue of agreements  with the Company,  are entitled to include
their securities in any such  registration,  (ii) which are held by officers and
directors  of the Company,  or (iii) which are being  offered for the account of
the Company  (collectively,  the securities referred to in clauses (i), (ii) and
(iii) in this paragraph are hereinafter referred to as the "Other Securities").

                  1.3 Company Registration. If (but without any obligation to do
so) the Company proposes to register  (including for this purpose a registration
effected by the Company for stockholders other than the Holder) any of its stock
or other securities under the Act in connection with the public offering of such
securities  solely for cash (other than a  registration  relating  solely to the
sale of securities to participants in a Company stock option,  stock purchase or
similar plan or a SEC Rule 145  transaction,  a  registration  on any form which
does not include  substantially  the same information as would be required to be
included  in a  registration  statement  covering  the  sale of the  Registrable
Securities or a registration in which the only Common Stock being  registered is
Common Stock  issuable upon  conversion of debt  securities  that are also being
registered),  the Company shall, at such time,  promptly give the Holder written
notice of such registration. Upon the written request of the Holder given within
twenty (20) days after mailing of such notice by the Company in accordance  with
Section 2.5, the Company shall,  subject to the provisions of Section 1.8, cause
to be registered under the Act all of the Registrable Securities that the Holder
has  requested  to be  registered.  No  registration  effected  pursuant to this
Section 1.3 shall relieve the Company of its  obligations to effect the required
registration  pursuant  to  Section  1.2.  The  Holder  shall  have the right to
withdraw  his  request  for  inclusion  of  its  Registrable  Securities  in any
registration  statement pursuant to this Section 1.3 by giving written notice to
the Company of its request to withdraw.

                  1.4  Obligations  of the  Company.  When  required  under this
Section 1 to effect the registration of the Registrable Securities,  the Company
shall, as expeditiously as reasonably possible:
<PAGE>
                           (a) Prepare and file with the Securities and Exchange
Commission  (the "SEC") a Shelf  Registration  Statement or, if applicable,  any
other form of  registration  statement,  as the case may be, with respect to the
Registrable  Securities  and use its best  efforts  to cause  such  registration
statement to become  effective  within one hundred  twenty (120) days after such
registration  statement was filed and to keep such Shelf Registration  Statement
effective for a period up to the fifth  anniversary  of the date hereof or until
the earlier of (i)  completion  of the  distribution  contemplated  in the Shelf
Registration  Statement  has  been  completed,  and (ii)  when  all  Registrable
Securities may be sold without  restriction under Rule 144 promulgated under the
Act provided, however, that before filing a registration statement or prospectus
under the Act provided,  however, that before filing a registration statement or
prospectus or any amendments or supplements  thereto,  or comparable  statements
under securities or blue sky laws of any jurisdiction,  the Company will furnish
to one counsel  for the Holder (the  "Holder's  Counsel")  participating  in the
planned offering (selected by the Holder), and the underwriters,  if any, copies
of all such documents  proposed to be filed  (including  all exhibits  thereto),
which documents will be subject to the reasonable review and reasonable  comment
of such counsel.

                           (b) Prepare and file with the SEC such amendments and
supplements to such registration statement and the prospectus used in connection
with  such  registration  statement  as may be  necessary  to  comply  with  the
provisions of the Act with respect to the disposition of all securities  covered
by such registration statement.

                           (c)   Furnish   to  the  Holder   whose   Registrable
Securities  are  covered by the Shelf  Registration  Statement  such  numbers of
copies of a prospectus,  including a preliminary prospectus,  in conformity with
the  requirements  of the Act, and such other  documents as they may  reasonable
request in order to facilitate the disposition of Registrable  Securities  owned
by them.

                           (d) Use its best  efforts to register and qualify the
securities covered by such registration statement under such other securities or
Blue Sky laws of such  jurisdictions  as shall be  reasonably  requested  by the
Holder  whose  Registrable  Securities  are  covered  by the Shelf  Registration
Statement;  provided  that the  Company  shall  not be  required  in  connection
therewith  or as a  condition  thereto to qualify  to do  business  or to file a
general consent to service of process in any such states or jurisdictions unless
the Company is already subject to service in such jurisdiction.

                           (e) In the event the Registrable Securities are to be
sold through an  underwritten  public offering under Section 1.3, enter into and
perform its obligations under an underwriting  agreement, in usual and customary
form, with the managing  underwriter of such offering.  The Holder  proposing to
distribute  Registrable  Securities  through such  underwritten  public offering
shall also enter into and perform his  obligations  under such an agreement.  No
offering  pursuant to a  registration  statement  under  Section 1.2 shall be an
underwritten offering.

                           (f) In the event the Registrable Securities are to be
sold through an  underwritten  public  offering  under Section 1.3, use its best
efforts to furnish,  on the date that such Registrable  Securities are delivered
to the underwriters for sale in connection with a registration  pursuant to this
Section 1, (i) an  opinion,  dated such date,  of the counsel  representing  the
Company  for the  purposes of such  registration,  in form and  substance  as is
<PAGE>
customarily given to underwriters in an underwritten public offering,  addressed
to the  underwriters,  and (ii) a letter,  dated such date, from the independent
certified  public  accountants  of the Company  addressed  to the  underwriters,
stating that such  accountants are  independent  public  accountants  within the
meaning  of  the  Act  and  the  applicable   published  rules  and  regulations
thereunder,  and otherwise in form and in substance as is  customarily  given by
independent  certified public  accountants to underwriters in connection with an
underwritten public offering.

                           (g)   Promptly   notify   (i)  the   Holder   selling
Registrable  Securities covered by such registration statement and each managing
underwriter,  if any: (A) when the registration statement, the prospectus or any
prospectus  supplement  related  thereto  or  post-effective  amendment  to  the
registration  statement  has been filed and,  with  respect to the  registration
statement or any post-effective  amendment,  when the same has become effective,
(B) of the issuance by the SEC of any stop order suspending the effectiveness of
the  registration  statement  or the  initiation  of any  proceedings  for  that
purpose,  (C) of the receipt by the Company of any notification  with respect to
the suspension of the qualification of any Registrable Securities for sale under
the  securities or blue sky laws of any  jurisdiction  or the  initiation of any
proceeding  for  such  purpose,  and  (D)  when  a  prospectus  relating  to the
registration  statement  is  required  to be  delivered  under  the  Act  of the
happening  of any  event as a result of which the  prospectus  included  in such
registration  statement,  as then in effect,  includes an untrue  statement of a
material fact or omits to state a material fact required to be stated therein or
necessary  to make the  statements  therein not  misleading  in the light of the
circumstances  then  existing;  and (ii)  Holder's  Counsel  and  each  managing
underwriter  of any request by the SEC for  amendments  or  supplements  to such
registration   statement  or  prospectus   related  thereto  or  for  additional
information. If the notification relates to an event described in clause (i)(D),
the Company  shall,  in  accordance  with  paragraph  (b) of this  Section  1.4,
promptly  prepare  and  furnish to the  Holder  selling  Registrable  Securities
covered by such registration statement and each managing underwriter, if any, in
a registration  under Section 1.3 a reasonable  number of copies of a prospectus
supplemented  or amended so that, as thereafter  delivered to the  purchasers of
such  Registrable  Securities,  such  prospectus  shall  not  include  an untrue
statement  of a material  fact or omit to state a material  fact  required to be
stated therein or necessary to make the  statements  therein in the light of the
circumstances under which they were made not misleading.

                           (h) Cooperate  with the selling Holder of Registrable
Securities and the managing underwriter, if any, in a registration under Section
1.3 to  facilitate  the timely  preparation  and  delivery of  certificates  not
bearing nay restrictive  legends  representing the Registrable  Securities to be
sold, and cause such Registrable  Securities to be issued in such  denominations
and registered in such names and in accordance with the  underwriting  agreement
prior to any sale of Registrable  Securities to the  underwriters  or, if not an
underwritten offering, in accordance with the instructions of the selling Holder
of  Registrable  Securities  at least three  business  days prior to any sale of
Registrable  Securities  and  instruct  any  transfer  agent  and  registrar  of
Registrable Securities to release any stop transfer orders in respect thereto.

                           (i) Comply with all applicable  rules and regulations
of the SEC, and make  generally  available to its security  holders,  as soon as
reasonably  practicable  after the effective date of the registration  statement
(and in any event within 16 months  thereafter),  an earnings  statement  (which
need not be audited) covering the period of at least twelve  consecutive  months
beginning with the first day of the Company's  first calendar  quarter after the
effective date of the  registration  statement,  which earnings  statement shall
satisfy  the  provisions  of Section  11(a) of the  Securities  Act and Rule 158
thereunder.
<PAGE>
                           (j) (i) Cause all such Registrable Securities covered
by such registration statement to be listed on the principal securities exchange
on which similar  securities  issued by the Company are then listed (if any), if
the listing of such Registrable  Securities is then permitted under the rules of
such exchange,  or (ii) if no similar  securities are then so listed,  to either
cause all such  Registrable  Securities  to be listed on a  national  securities
exchange  or to  secure  designation  of all such  Registrable  Securities  as a
National  Association of Securities  Dealers,  Inc.  Automated  Quotation System
("NASDAQ")  "national market system security" within the meaning of Rule 11Aa2-1
of the Exchange Act or,  failing  that,  secure  NASDAQ  authorization  for such
shares and, without  limiting the generality of the foregoing,  take all actions
that may be required by the Company as the issuer of such Registrable Securities
in order to facilitate the managing underwriter's arranging for the registration
of at least two  market  makers as such with  respect  to such  shares  with the
National  Association of Securities Dealers,  Inc. (the "NASD"). (k) Provide and
cause to be maintained a transfer  agent and registrar for all such  Registrable
Securities  covered by such registration  statement not later than the effective
date of such registration statement.

                           (k)  Provide  and cause to be  maintained  a transfer
agent  and  registrar  for  all  such  Registrable  Securities  covered  by such
registration  statement not later than the effective  date of such  registration
statement.

                           (l) Deliver  promptly  to  Holder's  Counsel and each
underwriter,  if  any,  copies  of all  correspondence  between  the SEC and the
Company,  its counsel or auditors and all memoranda relating to discussions with
the SEC or its staff with  respect  to the  registration  statement,  other than
those  portions  of any such  memoranda  which  contain  information  subject to
attorney-client privilege with respect to the Company, and, upon receipt of such
confidentiality   agreements  as  the  Company  may  reasonably  request,   make
reasonably available for inspection by Holder's Counsel, by any underwriter,  if
any,   participating  in  any  disposition  to  be  effected  pursuant  to  such
registration  statement  if  such  registration  is  under  Section  1.3 and any
attorney,  accountant  or other  agent  retained  by any such  underwriter,  all
pertinent  financial  and  other  records,  pertinent  corporate  documents  and
properties of the Company,  and cause all of the Company's  officers,  directors
and employees to supply all information reasonably requested by Holder's Counsel
or such  underwriter,  attorney,  accountant  or agent in  connection  with such
registration statement.

                           (m)  Use  reasonable   best  efforts  to  obtain  the
withdrawal  of any  order  suspending  the  effectiveness  of  the  registration
statement.

                           (n)  Upon  written  request,  furnish  to the  Holder
participating in the offering and the managing  underwriter,  without charge, at
least one conformed copy of the  registration  statement and any  post-effective
amendments thereto,  including financial statements and schedules, all documents
incorporated therein by reference and all exhibits (including those incorporated
by reference).

                           (o)  Take  all  such  other  commercially  reasonable
actions as are  necessary or advisable  in order to expedite or  facilitate  the
disposition of such Registrable Securities.

                  1.5 Furnish Information.  It shall be a condition precedent to
the  obligations  of the Company to take any action  pursuant to this  Section 1
with  respect to the  Registrable  Securities  of the Holder  whose  Registrable
Securities are covered by the Shelf Registration Statement that the Holder shall
furnish to the Company  such  information  regarding  himself,  the  Registrable
Securities  held  by  him,  and  the  intended  method  of  disposition  of such
securities  as shall be required  to effect the  registration  of such  Holder's
Registrable Securities.
<PAGE>
                  1.6 Expenses of  Registration. 

                           (a) Subject to Section 1.6(c),  "Expenses" shall mean
any and all  fees and  expenses  incident  to the  Company's  performance  of or
compliance with this Section 1, including,  without  limitation:  (i) SEC, stock
exchange or NASD registration and filing fees and all listing fees and fees with
respect to the  inclusion  of  securities  in NASDAQ,  (ii) fees and expenses of
compliance  with state  securities or "blue sky" laws and in connection with the
preparation of a "blue sky" survey,  including  without  limitation,  reasonable
fees and expenses of blue sky counsel, (iii) printing and copying expenses, (iv)
messenger and delivery  expenses,  (v) expenses  incurred in connection with any
road show, (vi) fees and  disbursements  of counsel for the Company,  (vii) with
respect to each registration,  the fees and disbursements of one counsel for the
selling Holder  (selected by the Holder),  (viii) fees and  disbursements of the
Company's  independent public  accountants  (including the expenses of any audit
and/or "cold comfort" letter) and fees and expenses of other persons,  including
special experts,  retained by the Company, (ix) any fees and expenses payable to
a Qualified  Independent  Underwriter  (as such term is defined in Conduct  Rule
2720 of the National Association of Securities Dealers,  Inc.'s By-Laws) and (x)
any other fees and  disbursements of underwriters,  if any,  customarily paid by
issuers or sellers of securities (collectively, "Expenses").

                           (b) The Company  shall pay all Expenses  with respect
to any registration  pursuant to Section 1.2,  whether or not such  registration
statement becomes effective or remains effective for the period  contemplated by
Section 1.2(a).

                           (c) Notwithstanding the foregoing, (i) the provisions
of this  Section 1.6 shall be deemed  amended to the extent  necessary  to cause
these  expense  provisions to comply with "blue sky" laws of each state in which
the offering is made and (ii) in connection with any registration  under Section
1, the selling Holder shall pay all  underwriting  discounts and commissions and
any  transfer  taxes,  if any,  attributable  to the  sale  of such  Registrable
Securities,  and (iii) the Company shall, in the case of all registrations under
this Section 1, be responsible for all its internal expenses (including, without
limitation,  all salaries and expenses of its officers and employees  performing
legal or accounting duties).

                  1.7 Expenses of Company  Registration.  The Company shall bear
and pay all Expenses  incurred in connection  with any  registration,  filing or
qualification  of  Registrable  Securities  with  respect  to the  registrations
pursuant to Section 1.3 for the Holder  (which right may be assigned as provided
in Section 1.12).

                  1.8 Underwriting Requirements. In connection with any offering
involving an underwriting of shares of the Company's  capital stock, the Company
shall  not be  required  under  Section  1.3  to  include  any  of the  Holder's
securities in such underwriting unless they accept the terms of the underwriting
as agreed upon  between the Company and the  underwriters  selected by it (or by
other  persons  entitled  to  select  the  underwriters),  and then only in such
quantity  as the  underwriters  determine  in  their  sole  discretion  will not
jeopardize  the success of the offering by the  Company.  If the total amount of
securities,  including Registrable  Securities,  requested by stockholders to be
included in such offering  exceeds the amount of  securities  sold other than by
the  Company  that the  underwriters  determine  in  their  sole  discretion  is
compatible with the success of the offering,  then the Company shall be required
to  include  in the  offering  only that  number of such  securities,  including
<PAGE>
Registrable Securities, that the underwriters determine in their sole discretion
will not jeopardize  the success of the offering (the  securities so included to
be apportioned  pro rata among the selling  stockholders  according to the total
amount of  securities  entitled to be  included  therein  owned by each  selling
stockholder or in such other  proportions as shall mutually be agreed to by such
selling  stockholders,  but in any event subject to the apportionment  rights of
certain  selling  stockholders  under  Section  1.8 of the  Registration  Rights
Agreement,   dated   October   20,   1997,   between  the  Company  and  certain
stockholders).   For  purposes  of  the   preceding   parenthetical   concerning
apportionment,  for any  selling  stockholder  that is a Holder  of  Registrable
Securities and that is a partnership or corporate partners, retired partners and
stockholders  of such  Holder,  or the  estates  and family  members of any such
partners  and  retired  partners  and any trusts  for the  benefit of any of the
foregoing persons shall be deemed to be a single "selling  stockholder," and any
pro-rata  reduction  with respect to such "selling  stockholder"  shall be based
upon the aggregate  amount of shares carrying  registration  rights owned by all
entities and individuals  included in such "selling  stockholder," as defined in
this sentence.

                  1.9 Delay of Registration. The Holder shall not have any right
to obtain or seek an  injunction  restraining  or  otherwise  delaying  any such
registration as the result of any  controversy  that might arise with respect to
the interpretation or implementation of this Section 1.

                  1.10 Indemnification.  In the event any Registrable Securities
are included in a registration statement under this Section 1:

                           (a) To the extent  permitted by law, the Company will
indemnify and hold harmless that Holder whose Registrable Securities are covered
by the Registration Statement, its directors, officers,  fiduciaries,  employees
and  stockholders or general or limited  partners (and the directors,  officers,
employees and stockholders thereof), any underwriter (as defined in the Act) for
such Holder and each person,  if any, who  controls  such Holder or  underwriter
within the meaning of the Act or the Securities Exchange Act of 1934, as amended
(the "1934 Act"), each officer,  director,  employee,  stockholder or partner of
such underwriter,  against any losses, claims, damages, or liabilities (joint or
several)  or  actions or  proceedings  (whether  commenced  or  threatened)  and
expenses  (including  reasonable  fees of counsel  and any  amounts  paid in any
settlement  effected  with the  Company's  consent),  to which  they may  become
subject under the Act, the 1934 Act or any state securities law, insofar as such
losses,  claims,  damages,  or liabilities (or actions or proceedings in respect
thereof)  ("Claims")  or  expenses  arise  out of or are  based  upon any of the
following statements,  omissions or violations (collectively a "Violation"): (i)
any untrue statement or alleged untrue statement of a material fact contained in
such  registration  statement,  including any  preliminary  prospectus,  summary
prospectus  or  final  prospectus   contained   therein  or  any  amendments  or
supplements thereto,  together with documents incorporated by reference therein,
(ii) the omission or alleged  omission to state therein a material fact required
to  be  stated  therein,  or  necessary  to  make  the  statements  therein  not
misleading,  or (iii) any  violation or alleged  violation by the Company of the
Act,  the  1934  Act,  any  state  securities  law or  any  rule  or  regulation
promulgated  under the Act,  the 1934 Act or any state  securities  law; and the
Company will pay to such Holder, and each such underwriter or controlling person
any legal or other  expenses  reasonably  incurred  by them in  connection  with
investigating or defending any such loss, claim, damage,  liability,  expense or
action  or  proceeding;  provided,  however,  that (A) the  indemnity  agreement
<PAGE>
contained in this Section 1.10 shall not apply to amounts paid in  settlement of
any such Claim if such settlement is effected without the consent of the Company
(which consent shall not be unreasonably withheld), (B) the Company shall not be
liable in any case for any such Claim to the extent  that it arises out of or is
based upon a Violation  which  occurs in reliance  upon and in  conformity  with
written  information  furnished  expressly  for  use  in  connection  with  such
registration by the Holder, or any such underwriter or controlling  person. Such
indemnity and  reimbursement  of expenses  shall remain in full force and effect
regardless of any  investigation  made by as on behalf of such indemnified party
and shall survive the transfer of such securities by such Holder.

                  (b)  To  the  extent   permitted  by  law,  the  Holder  whose
Registrable  Securities are covered by the Shelf  Registration  Statement  will,
severally and not jointly,  indemnify and hold harmless the Company, each of its
directors,  each of its officers who has signed the registration statement, each
person,  if any,  who  controls  the Company  within the meaning of the Act, any
underwriter,  and any controlling  person of any such  underwriter,  against any
losses,  claims,  damages, or liabilities (joint or several) to which any of the
foregoing persons may become subject, under the Act, or the 1934 Act, insofar as
such Claim  arises out of or is based  upon any  Violation,  in each case to the
extent (and only to the extent) that such Violation  occurs in reliance upon and
in conformity with written  information  furnished by such Holder  expressly for
use in connection with such registration; and such Holder will pay, as incurred,
any legal or other  expenses  reasonably  incurred by any person  intended to be
indemnified,  pursuant to this Section 1.10, in connection with investigating or
defending  any such  Claim;  provided,  however,  that the  indemnity  agreement
contained in this Section 1.10 shall not apply to amounts paid in  settlement of
any such  Claim if such  settlement  is  effected  without  the  consent of such
Holder, which consent shall not be unreasonably  withheld;  provided that, in no
event shall any  indemnity  under this Section 1.10 exceed the net proceeds from
the offering  received by such  Holder.  Such  indemnity  and  reimbursement  of
expenses shall remain in full force and effect  regardless of any  investigation
made by as on behalf of such indemnified party and shall survive the transfer of
such securities by such Holder.

                  (c) Promptly after receipt by an indemnified  party under this
Section  1.10  of  notice  of the  commencement  of any  action  (including  any
governmental action), such indemnified party will, if a claim in respect thereof
is to be made against any indemnifying party under this Section 1.10, deliver to
the  indemnifying  party a written  notice of the  commencement  thereof and the
indemnifying  party shall have the right to  participate  in, and, to the extent
the indemnifying  party so desires,  jointly with any other  indemnifying  party
similarly  noticed,   to  assume  the  defense  thereof  with  counsel  mutually
satisfactory  to the  parties;  provided,  however,  that an  indemnified  party
(together with all other  indemnified  parties which may be represented  without
conflict by one counsel)  shall have the right to retain one  separate  counsel,
with  the  fees  and  expenses  to be paid  by the  indemnifying  party,  (i) if
representation  of  such  indemnified  party  by  the  counsel  retained  by the
indemnifying  party would be inappropriate due to actual or potential  differing
interests between such indemnified party and any other party represented by such
counsel  in  such  proceeding;  (ii) if the  indemnifying  party  fails  to take
reasonable steps necessary to defend  diligently the action or proceeding within
30 days after  receiving  notice from such  indemnified  party; or (iii) if such
indemnified  party who is a defendant in any action or proceeding  which is also
brought  against the  indemnifying  party  reasonably  shall have concluded that
<PAGE>
there may be one or more legal  defenses  available  to such  indemnified  party
which are not  available  to the  indemnifying  party.  The  failure  to deliver
written  notice  to the  indemnifying  party  within  a  reasonable  time of the
commencement  of such  action,  if  prejudicial  to its  ability to defend  such
action,   shall  relieve  such  indemnifying  party  of  nay  liability  to  the
indemnified  party  under this  Section  1.10,  but the  omission  so to deliver
written  notice to the  indemnifying  party will not relieve it of any liability
that it may have to any  indemnified  party  otherwise  than under this  Section
1.10.

                  (d) If the  indemnification  provided for in this Section 1.10
is held by a court of competent jurisdiction to be unavailable to an indemnified
party  with  respect  to any Claim or  expense  referred  to  therein,  then the
indemnifying  party, in lieu of payable by such indemnified party as a result of
such  Claim or expense  in such  proportion  as is  appropriate  to reflect  the
relative fault of the indemnifying  party on the one hand and of the indemnified
party on the other in connection  with the statements or omissions that resulted
in such Claim or expense as well as any other relevant equitable considerations.
The relative fault of the indemnifying  party and of the indemnified party shall
be determined by reference to, among other things, whether the untrue or alleged
untrue  statement of a material  fact or the  omission to state a material  fact
relates to information  supplied by the indemnifying party or by the indemnified
party and the parties' relative intent,  knowledge,  access to information,  and
opportunity to correct or prevent such statement or omission.  If, however,  the
allocation  provided in the first sentence of this paragraph is not permitted by
applicable law, then each indemnifying party shall contribute to the amount paid
or payable by such  indemnified  party in such  proportion as is  appropriate to
reflect  not only such  relative  faults but also the  relative  benefits of the
indemnifying  party  and the  indemnified  party as well as any  other  relevant
equitable considerations. The parties hereto agree that it would not be just and
equitable  if  contributions  pursuant  to  this  Section  1.10(d)  were  to  be
determined by pro rata  allocation  or by any other method of  allocation  which
does  not  take  account  of the  equitable  considerations  referred  to in the
preceding  sentences  of this  Section  1.10(d).  The amount  paid or payable in
respect  of any Claim  shall be deemed to  include  any legal or other  expenses
reasonably  incurred by such indemnified party in connection with  investigating
or  defending  such  Claim.  No person  guilty of  fraudulent  misrepresentation
(within the meaning of Section 11(f) of the Securities Act) shall be entitled to
contribution   from  any  person   who  was  not   guilty  of  such   fraudulent
misrepresentation.  Notwithstanding  anything  in this  Section  1.10(d)  to the
contrary,  no  indemnifying  party  (other than the  Company)  shall be required
pursuant to this Section  1.10(d) to contribute  any amount in excess of the net
proceeds  received  by such  indemnifying  party  from the  sale of  Registrable
Securities  in the  offering  to which  the  Claims of the  indemnified  parties
relate, less the amount of any indemnification payment made by such indemnifying
party pursuant to Sections 1.10(b).
 
                  (e)  Notwithstanding  the  foregoing,  to the extent  that the
provisions on  indemnification  and  contribution  contained in the underwriting
agreement  entered into in connection with the underwritten  public offering are
in conflict with the foregoing  provisions,  the provisions in the  underwriting
agreement shall control.

                  (f) The  obligations  of the  Company  and  Holder  under this
Section  1.10 shall  survive  the  completion  of any  offering  of  Registrable
Securities in a registration statement under this Section 1, and otherwise.
<PAGE>
                  1.11 Reports  Under  Securities  Exchange Act of 1934.  With a
view to making  available  to the Holder the  benefits  of Rule 144  promulgated
under the Act and any other rule or  regulation  of the SEC that may at any time
permit  a  Holder  to sell  securities  of the  Company  to the  public  without
registration or pursuant to a registration on Form S-3, the Company agrees to:

                           (a) make and keep public  information  available,  as
those terms are understood and defined in SEC Rule 144, at all times;

                           (b) take such action as is  necessary to maintain the
Holder's  ability  to  utilize  Form  S-3 for  the  sale  of  their  Registrable
Securities;

                           (c) file with the SEC in a timely  manner all reports
and other documents required of the Company under the Act and the 1934 Act; and

                           (d) furnish to the Holder, so long as the Holder owns
any Registrable  Securities,  forthwith upon request (i) a written  statement by
the Company that it has complied with the reporting requirements of the SEC Rule
144, the Act and the 1934 Act (at any time after it so  qualifies),  (ii) a copy
of the most  recent  annual or  quarterly  report of the  Company and such other
reports and  documents  filed by the Company  with the SEC, and (iii) such other
information as may be reasonably requested in availing the Holder of any rule or
regulation of the SEC which permits the selling of any such  securities  without
registration or pursuant to such form.

                  1.12 Assignment of Registration Rights.

                           (a) The  rights  to cause  the  Company  to  register
Registrable Securities pursuant to this Section 1 may be assigned (but only with
all related  obligations)  by the Holder to a  transferee  or  assignees of such
securities  provided:  (i) the Company is,  within a reasonable  time after such
transfer,  furnished  with  written  notice  of the  name  and  address  of such
transferee  or  assignee  and  the   securities   with  respect  to  which  such
registration rights are being assigned;  (ii) such transferee or assignee agrees
in  writing  to be bound by and  subject  to the  terms and  conditions  of this
Agreement,  including, without limitation, the provisions of Section 1.14 below;
and (iii) such  assignment  shall be effective  only if such  transfer is exempt
from  registration  under the Act. For the purposes of determining the number of
shares of Registrable  Securities held by a transferee or assignee,  the holding
of  transferees  and  assignees  of a  partnership  who are  partners or retired
partners  of  such  partnership   (including   spouses  and  ancestors,   lineal
descendants  and  siblings of such  partners or spouses who acquire  Registrable
Securities by gift, will or intestate  succession) shall be aggregated  together
with the partnership;  provided that all assignees and transferees who would not
qualify  individually for assignment of registration  rights shall have a single
attorney-in-fact for the purpose of exercising any rights,  receiving notices or
taking any action under this Section 1.
<PAGE>
                           (b)  Subject to clause  (a) above,  the right to have
the Company register the Registrable  Securities  pursuant to this Section 1 may
not otherwise be assigned;  provided however, that (i) any heir or the estate of
the Holder which acquires the Registrable Securities from such Holder by will or
intestate  succession  shall  be  entitled  to have  the  Company  register  the
Registrable  Securities  pursuant to this Section 1 (provided that such heirs or
such estate shall have a single  attorney-in-fact  for the purpose of exercising
any rights,  receiving  any notices or taking any action  under this Section 1),
and  (ii) any  individual  Holder  may  sell,  assign  or  transfer  Registrable
Securities  to his or her spouse or children or to a trust  established  for the
benefit  of his or  her  spouse,  children  or  himself  or  herself,  and  such
transferee  shall be  entitled  to have the  Company  register  the  Registrable
Securities  pursuant to this Section 1, if, and only if, such transferee  agrees
in  writing to be bound by the terms of this  Agreement.  In each such event and
for purposes of this  Agreement,  the term "Holder" as used herein shall include
all such heirs, such estate or such transferees.

                  1.13 Limitations on Subsequent  Registration  Rights. From and
after the date of this  Agreement,  the  Company  shall not,  without  the prior
written  consent  of the  Holder,  enter into any  agreement  with any holder or
prospective holder of any securities of the Company that would allow such holder
or prospective holder to include such securities in any registration filed under
Section 1.2 hereof,  unless  under the terms of such  agreement,  such holder or
prospective  holder may include such securities in any such registration only to
the extent that the  inclusion of his  securities  will not reduce the amount of
the  Registrable  Securities  of the  Holder  that  is  included. 

                  1.14 "Market  Stand-Off"  Agreement.  The Holder hereby agrees
that, during the period of duration  specified by the Company and an underwriter
of Common Stock or other securities of the Company, following the effective date
of a registration statement of the Company filed under the Act, it shall not, to
the extent requested by the Company and such underwriter, directly or indirectly
sell, offer to sell, contract to sell (including,  without limitation, any short
sale),  grant any option to purchase or otherwise  transfer or dispose of (other
than to donees who agree to be similarly  bound) any  securities  of the Company
held by it at any time during such period except  Common Stock  included in such
registration,  and the Holder  agrees to enter into an  agreement to such effect
with such underwriter; provided, however, that (a) all officers and directors of
the Company enter into similar  agreements,  and, (b) such market stand-off time
period shall not exceed 120 days.  If the  underwriters  agree to any waivers of
such  restrictions,  then the Holder  shall be  entitled  to sell,  transfer  or
dispose of the same number or amount of  securities of the Company as the person
or entity receiving such waiver, upon the same terms and conditions set forth in
such waiver.

                  In order to enforce the  foregoing  covenant,  the Company may
impose stop-transfer  instruction with respect to the Registrable  Securities of
the Holder (and the shares or  securities  of every other person  subject to the
foregoing restriction) until the end of such period. 

                  1.15 No  Required  Sale.  Nothing in this  Agreement  shall be
deemed to create an independent obligation on the part of the Holder to sell any
Registrable Securities pursuant to any effective registration statement.

                  2. Miscellaneous.

                  2.1  Successors  and  Assigns.  Except as  otherwise  provided
herein,  and provided that the transfer or assignment is in accordance  with the
terms  hereof,  the terms and  conditions of this  Agreement  shall inure to the
benefit of and be binding  upon the  respective  successors  and  assigns of the
<PAGE>
parties  (including  any  permitted  transferees  of any  shares of  Registrable
Securities).  Nothing in this  Agreement,  express or  implied,  is  intended to
confer  upon  any  party  other  than the  parties  hereto  or their  respective
successors and assigns any rights, remedies, obligation, or liabilities under or
by reason of this Agreement, except as expressly provided in this Agreement.

                  2.2  Governing  Law. This  Agreement  shall be governed by and
construed  under the laws of the State of New York without  regard to principles
of conflicts or choice of laws.

                  2.3  Counterparts.  This  Agreement  may be executed in two or
more counterparts,  each of which shall be deemed an original,  but all of which
together shall constitute one and the same instrument.

                  2.4 Titles and  Subtitles.  The titles and  subtitles  used in
this  Agreement  are used for  convenience  only and are not to be considered in
construing or interpreting this Agreement.

                  2.5 Notices. Unless otherwise provided, any notice required or
permitted  under this  Agreement  shall be given in writing  and shall be deemed
effectively  given upon  personal  delivery  to the party to be notified or upon
deposit with the United States Post Office,  by  registered  or certified  mail,
postage  prepaid  and  addressed  to the  party to be  notified  at the  address
indicated for such party in the Settlement  Agreement,  or at such other address
as such party may  designate  by ten (10) days'  advance  written  notice to the
other parties.

                  2.6  Expenses.  If any action at law or in equity is necessary
to enforce or interpret the terms of this Agreement,  the prevailing party shall
be entitled to reasonable attorney's fees, costs, and necessary disbursements in
addition to any other relief to which such party may be entitled.

                  2.7 Amendments and Waivers.  Any term of this Agreement may be
amended and the  observance of any term of this  Agreement may be waived (either
generally   or  in  a   particular   instance   and  either   retroactively   or
prospectively), only with the written consent of the Company and the Holder. Any
amendment  or waiver  effected  in  accordance  with this  Section  2.7 shall be
binding upon the Holder of any  Registrable  Securities then  outstanding,  each
future Holder of all such Registrable Securities, and the Company.

                  2.8 Severability.  If one or more provisions of this Agreement
are held to be  unenforceable  under  applicable  law, such  provision  shall be
excluded  from  this  Agreement  and  the  balance  of the  Agreement  shall  be
interpreted  as if such  provision  were so excluded and shall be enforceable in
accordance with its terms.

                  2.9 Nominees for Beneficial Owners. If Registrable  Securities
are held by a nominee for the  beneficial  owner thereof,  the beneficial  owner
thereof  may,  at its  option,  be  treated  as the  Holder of such  Registrable
Securities  for  purposes  of any  request or other  action by the Holder or the
Holder  of   Registrable   Securities   pursuant  to  this   Agreement  (or  any
determination  of any number or  percentage of shares  constituting  Registrable
Securities  held  by  the  Holder  or  the  Holder  of  Registrable   Securities
contemplated by this  Agreement),  provided that the Company shall have received
assurances reasonably satisfactory to it of such beneficial ownership.
<PAGE>
                  2.10 Specific Performance. The parties hereto acknowledge that
there  would be no  adequate  remedy at law if any party fails to perform any of
its obligations hereunder, and accordingly agree that each party, in addition to
any  other  remedy to which it may be  entitled  at law or in  equity,  shall be
entitled to injunctive relief,  including specific performance,  to enforce such
obligation without the posting of any bond, and, if any action should be brought
in  equity to  enforce  any of the  provisions  of this  Agreement,  none of the
parties hereto shall raise the defense that there is an adequate remedy at law.

                  2.11 No  Inconsistent  Agreements.  The rights  granted to the
Holder of Registrable  Securities  hereunder do not in any way conflict with and
are not  inconsistent  with any other agreements to which the Company is a party
or by which it is  bound.  Without  the prior  written  consent  of the  Holder,
neither the Company nor any Holder will, on or after the date of this  Agreement
enter into any agreement  with respect to its securities  which is  inconsistent
with the rights  granted  in this  Agreement  or  otherwise  conflicts  with the
provisions  hereof,  other than any lock-up  agreement with the  underwriters in
connection with any registered  offering effected  hereunder,  pursuant to which
the Company  shall agree not to register for sale,  and the Company  shall agree
not to  sell  or to  otherwise  dispose  of,  Common  Stock  or  any  securities
convertible into or exercisable or exchangeable of Common Stock, for a specified
period following the registered offering. The Company further agrees that if any
other  registration  rights  agreement  entered  into  after  the  date  of this
Agreement  will respect to any of its  securities  contains terms which are more
favorable to, or less restrictive on, the other party thereto than the terms and
conditions in this Agreement are (insofar as they are applicable to the Holder),
then the terms and conditions of this Agreement  shall  immediately be deemed to
have been  amended  without  further  action  by the  Company  or the  Holder of
Registrable  Securities  so that the Holder  shall be entitled to the benefit of
any such more favorable or less restrictive terms or conditions.

                  2.12 Entire Agreement.  This Agreement (including the Exhibits
hereto,  if any)  constitutes  the full and entire  understanding  and agreement
between the parties with regard to the subjects hereof and thereof.
<PAGE>
                  IN  WITNESS   WHEREOF,   the  parties   have   executed   this
Registration Rights Agreement as of the date first above written.

                                           EXOGEN, INC.


                                           By:    /s/Patrick A. McBrayer
                                                  ---------------------
                                           Name:  Patrick A. McBrayer
                                           Title: President and Chief Executive
                                                  Officer

                                           Address:     10 Constitution Avenue
                                                        P.O. Box 6860
                                                        Piscataway, NJ  08855

                                           WARRANTHOLDER:


                                                  /s/Dr.Arthur A. Pilla
                                                  ------------------
                                                  Dr. Arthur A. Pilla



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