WARRANT AGREEMENT


         WARRANT AGREEMENT (the "Warrant Agreement") is dated as of December 18,
1995 between EDITEK,  INC., a Delaware corporation (the "Company") and Samuel C.
Powell  and his  authorized,  registered  successors  or assigns  (the  "Warrant
Holder").

         Subject to adjustment as hereinafter provided,  the Company proposes to
issue  to  Warrant  Holder  certain  warrants  as  hereinafter   described  (the
"Warrants")  to  purchase up to an  aggregate  of 32,679  shares  (the  "Warrant
Shares") of the Company's  Common  Stock,  par value $.15 per share (the "Common
Stock"),  exercisable at $2.96 per Warrant Share,  and each Warrant entitles the
holder thereof to purchase one share of Common Stock.

         NOW,  THEREFORE,  in  consideration  of the  premises  and  the  mutual
agreements herein set forth and for other good and valuable  consideration,  the
parties hereto agree as follows:

         1. Issuance of Warrants;  Form of Warrant. The Company will issue, sell
and deliver  the  Warrant  Certificate  evidencing  the  Warrants to the Warrant
Holder  or at its  direction,  to its bona  fide  officers  and  directors  upon
execution  of  this  Warrant  Agreement.  The  text of the  Warrant  Certificate
(hereinafter referred to as "Warrant" or "Warrant  Certificate") and the form of
election to purchase shares to be attached thereto shall be substantially as set
forth in Exhibit A attached hereto.  The Warrants shall be executed on behalf of
the Company by the manual or  facsimile  signature  of the present or any future
President or Vice President of the Company, under its corporate seal, affixed or
in  facsimile,  attested by the manual or facsimile  signature of the present or
any future Secretary or Assistant Secretary of the Company.

         2.  Registered  Form.  The Warrants  shall be  registered  in a Warrant
register  as they are  issued.  The  Company  shall  be  entitled  to treat  the
registered  holder (the "Warrant Holder") of any Warrant on the Warrant register
as the  owner  in fact  thereof  for all  purposes  and  shall  not be  bound to
recognize  any  equitable  or other claim to or interest in such  Warrant on the
part of any other person. The Warrants shall be registered initially in the name
of Samuel C. Powell.

         3. Transfer of Warrants.  The Warrants and the Warrant  Shares will not
be  transferable,  in  part or in  whole,  except  (i) in  compliance  with  the
Securities  Act of 1933, as amended (the "Act"),  and the rules and  regulations
promulgated  thereunder,  and any applicable state securities laws and (ii) only
on the books of the Company upon  delivery  thereof duly endorsed by the Warrant
Holder or by its duly authorized  attorney or representative,  or accompanied by
proper evidence of succession, assignment or authority to transfer. In all cases
of transfer by an attorney, the original power of attorney, duly approved, or an
official copy thereof,  duly certified,  shall be deposited with the Company. In
case  of  transfer  by  executors,  administrators,  guardians  or  other  legal
representatives, duly






authenticated evidence of their authority shall be produced, and may be required
to be deposited with the Company in its  discretion.  Upon any  registration  of
transfer,  the  Company  shall  deliver a new Warrant or Warrants to the persons
entitled  thereto.  The  Warrants  may be  exchanged  at the  option of the then
Warrant  Holder  thereof,  for another  Warrant,  or other Warrants of different
denominations,  of like tenor and  representing  in the  aggregate  the right to
purchase a like number of Warrant  Shares upon  surrender  to the Company or its
duly authorized agent.  Notwithstanding the foregoing, the Company shall have no
obligation  to cause  Warrants  to be  transferred  on its books to any  person,
unless  the  Warrant  Holder or Warrant  Holders  thereof  shall  furnish to the
Company evidence of compliance with the Act in accordance with the provisions of
Section 10 of this Agreement.

         4. Term of Warrants;  Exercise of Warrants.  Each Warrant  entitles the
Warrant Holder thereof to purchase one share of Common Stock at a purchase price
of $2.96 per share (the  "Exercise  Price") at any time after  December 18, 1995
(the  "Effective  Date") until 5:00 p.m.,  New York City time, on March 17, 1999
(the  "Expiration  Date").  The Exercise  Price and the number of Warrant Shares
issuable  upon  exercise  of the  Warrants  are subject to  adjustment  upon the
occurrence of certain  events,  pursuant to the  provisions of Section 8 of this
Agreement.  Subject to the  provisions of this  Agreement,  each Warrant  Holder
shall have the right,  which may be exercised as set forth in such Warrants,  to
purchase  from the Company (and the Company shall issue and sell to such Warrant
Holder)  the  number of fully  paid and  nonassessable  shares  of Common  Stock
specified in such Warrant, upon surrender to the Company, or its duly authorized
agent of such Warrants,  with the form of election to purchase  attached thereto
duly  completed  and signed,  with  signatures  guaranteed by a member firm of a
national securities  exchange,  a commercial bank (not a savings bank or savings
and loan  association) or trust company located in the United States or a member
of the NASD, and upon payment to the Company of the Exercise  Price, as adjusted
(if  applicable) in accordance  with  provisions of Section 8 of this Agreement,
times the number of Warrant  Shares in respect of which such  Warrants  are then
exercised.  Payment  of such  Exercise  Price  may be  made in cash or by  check
payable  to the  order  of the  Company.  No  adjustment  shall  be made for any
dividends on any shares of stock issuable upon exercise of a Warrant.  Upon each
surrender  of  Warrants  and payment of the  Exercise  Price as  aforesaid,  the
Company shall issue and cause to be delivered with all reasonable dispatch to or
upon the written  order of the Warrant  Holder of such  Warrants and (subject to
receipt of evidence of compliance with the Act in accordance with the provisions
of Section 10 of this  Agreement)  in such name or names as such Warrant  Holder
may  designate,  a certificate  or  certificates  for the number of full Warrant
Shares so purchased upon the exercise of such  Warrants,  together with cash, as
provided in Section 9 of this  Agreement,  in respect of any fractional  Warrant
Shares otherwise issuable upon such surrender.  Such certificate or certificates
shall be deemed to have been  issued  and any person so  designated  to be named
therein shall be deemed to have become a holder of record of such Warrant Shares
as of the date of the surrender of Warrants and payment of the Exercise Price as
aforesaid; provided, however, that if, at the date of surrender of such Warrants
and payment of such Exercise  Price,  the transfer books for the Common Stock or
other class of stock  purchasable  upon the exercise of such  Warrants  shall be
issuable, shall be closed, the certificates for the shares

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shall be issuable as of the date on which such books are reopened and until such
time the  Company  shall be under no duty to deliver  any  certificate  for such
Warrant Shares;  provided,  further,  that the transfer books,  unless otherwise
required by law, shall not be closed at any one time for a period longer than 20
days. The rights of purchase  represented by the Warrants shall be  exercisable,
at the election of the Warrant Holders  thereof,  either in full or from time to
time in part and, in the event that any Warrant is  exercised in respect of less
than all of the Warrant Shares purchasable on such exercise at any time prior to
the Expiration  Date, a new Warrant or Warrants will be issued for the remaining
number of Warrant Shares specified in the Warrant so surrendered.

         5. Payment of Taxes. The Company will pay all documentary  stamp taxes,
if any,  attributable  to the  issuance of Warrant  Shares upon the  exercise of
Warrants;  provided,  however, that the Company shall not be required to pay any
tax or taxes  which may be payable in respect of any  transfer  involved  in the
issue or delivery of any certificates for Warrant Shares,  and the Company shall
not be required  to issue or deliver any  certificate  for such  Warrant  Shares
until the person  requesting the same has paid to the Company the amount of such
tax or has  established  to the  Company's  satisfaction  that such tax has been
paid.

         6. Mutilated or Missing Warrants.  In case any of the Warrants shall be
mutilated, lost, stolen or destroyed, the Company may, in its discretion,  issue
and  deliver in  exchange  and  substitution  for and upon  cancellation  of the
mutilated  Warrant,  or in lieu of and substitution for the Warrant lost, stolen
or  destroyed,  a new  Warrant  for the number of  Warrants  represented  by the
Warrant  so  mutilated,  lost,  stolen or  destroyed  but only upon  receipt  of
sufficient evidence of such loss, theft or destruction of such Warrant,  and the
ownership thereof,  and an agreement to indemnify the Company, if required,  all
satisfactory to the Company.  An applicant for such substitute Warrants shall so
comply  with such other  reasonable  regulations  and pay such other  reasonable
charges incidental thereto as the Company may prescribe.

         7.  Reservation of Warrant Shares,  etc. The Company shall at all times
after the  Effective  Date keep  reserved,  out of the  authorized  and unissued
Common Stock,  a number of shares of Common Stock  sufficient to provide for the
exercise  of the rights of purchase  represented  by the  outstanding  Warrants.
American  Stock  Transfer & Trust  Company,  transfer agent for the Common Stock
(the "Transfer Agent"),  and every subsequent transfer agent, if any, for shares
of the Company's  capital stock  issuable upon the exercise of any of the rights
of purchase aforesaid,  will be irrevocably authorized and directed at all times
until the  Expiration  Date to reserve  such number of  authorized  and unissued
shares as shall be required for such purpose. The Company will itself provide or
otherwise  make  available  any cash which may be  distributable  as provided in
Section 9 of this  Agreement.  All Warrants  surrendered  in the exercise of the
rights thereby  evidenced  shall be canceled,  and such canceled  Warrants shall
constitute sufficient evidence of the number of shares of Common Stock that have
been issued upon the exercise of such Warrants. No shares of Common

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Stock  shall be  subject to  reservation  in  respect  of  unexercised  Warrants
subsequent to the Expiration Date.

         8.  Adjustments  of Exercise  Price and Number of Warrant  Shares.  The
Exercise Price and the number and kind of securities  purchasable  upon exercise
of each  Warrant  shall be  subject  to  adjustment  from  time to time upon the
happening of certain events, as follows:

                  (a) In case the  Company  shall (i)  declare a dividend on its
Common  Stock in  shares  of Common  Stock or make a  distribution  in shares of
Common  Stock,  (ii)  subdivide  its  outstanding  shares of Common Stock into a
greater number of shares,  (iii) combine its outstanding  shares of Common Stock
into  a  smaller   number  of   shares  of  Common   Stock  or  (iv)   issue  by
reclassification  of its shares of Common Stock other  securities of the Company
(including  any such  reclassification  in connection  with a  consolidation  or
merger  in which the  Company  is the  continuing  corporation),  the  number of
Warrants Shares  purchasable upon exercise of each Warrant  immediately prior to
the record or  effective  date  therefor  shall be  adjusted so that the Warrant
Holder of each  Warrant  shall be  entitled  to  receive  the kind and number of
Warrant  Shares or other  securities  of the Company  which such Warrant  Holder
would have owned or have been  entitled to receive after the happening of any of
the events described above, had such Warrant been exercised immediately prior to
the  happening  of such  event or any  record  date  with  respect  thereto.  An
adjustment   made  pursuant  to  this  paragraph  (a)  shall  become   effective
immediately  after the effective  date of such event  retroactive to immediately
after the record date, if any, for such event.

                  (b) Whenever the number of Warrant Shares purchasable upon the
exercise of each Warrant is adjusted,  as herein  provided,  the Exercise  Price
shall adjusted by  multiplying  such exercise  Price  immediately  prior to such
adjustment  by a fraction,  the numerator of which shall be the number of shares
purchasable  upon  the  exercise  of  each  Warrant  immediately  prior  to such
adjustment,  and the  denominator of which shall be the number of Warrant Shares
so purchasable immediately thereafter.

                  (c) For the  purpose of this  Section  8, the term  "shares of
Common  Stock" shall mean (i) the class of stock  designated as the Common Stock
of the  Company at the date of this  Agreement  or (ii) any other class of stock
resulting from successive changes or  reclassification of such shares consisting
solely of changes in par  value,  or from par value to no par value,  or from no
par  value to par  value.  In the  event  that at any  time,  as a result  of an
adjustment  made  pursuant to paragraph  (a) above,  the Warrant  Holders  shall
become  entitled to purchase  any shares of capital  stock of the Company  other
than  shares of Common  Stock,  thereafter  the number of such  other  shares so
purchasable  upon exercise of each Warrant and the Exercise Price of such shares
shall be  subject  to  adjustment  from time to time in a manner and on terms as
nearly  equivalent as practicable to the provisions  with respect to the Warrant
Shares contained in paragraphs (a) through (b), inclusive, above, and paragraphs
(d) through (f), inclusive, of this Section 8, and the provisions of Sections 4,
5, 7 and 12, with  respect to the Warrant  Shares,  shall apply on like terms to
any such other shares.

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                  (d) The Company may at its option, at any time during the term
of the  Warrants,  reduce the then current  Exercise  Price to any amount deemed
appropriate by the Board of Directors of the Company; provided, however, that in
no event shall the Exercise  Price be adjusted  below the par value per share of
the Common Stock.

                  (e) In case of any consolidation or merger of the Company with
or into  another  corporation  r in case of any sale or  conveyance  to  another
corporation of the property of the Company as an entirety or substantially as an
entirety,  the  Company  or such  successor  or  purchasing  corporation  (or an
affiliate of such  successor  or  purchasing  corporation),  as the case may be,
agrees  that such  Warrant  Holder  shall  have the right for  thirty  (30) days
thereafter  upon payment of the Exercise  Price in effect  immediately  prior to
such action to  purchase  upon  exercise of each  Warrant the kind and amount of
shares and other  securities and property  (including  cash) which he would have
owned  or  have  been   entitled  to  receive   after  the   happening  of  such
consolidation,  merger,  sale or  conveyance  had such  Warrant  been  exercised
immediately  prior to such action.  The  provisions of this  paragraph (e) shall
similarly apply to successive consolidations, mergers, sales or conveyances.

                  (f)  Notwithstanding  any adjustments in the Exercise Price or
the  number or kind of shares  purchasable  upon the  exercise  of the  Warrants
pursuant to this Agreement, certificates for Warrants issued prior or subsequent
to such  adjustments many continue to express the same price and number and kind
of shares as are stated in the  Warrants  initially  issuable  pursuant  to this
Agreement.

         9.  Fractional  Interests.  The Company  shall not be required to issue
fractions of shares of Common  Stock on the  exercise of Warrants.  If more than
one Warrant shall be presented for exercise in full at the same time by the same
Warrant  Holder,  the number of Warrant  Shares which shall be issuable upon the
exercise  thereof  shall be  computed  on the basis of the  aggregate  number of
Warrant  Shares  purchasable  on exercise of the Warrants so  presented.  If any
fraction of a share of Common Stock  would,  except for the  provisions  of this
Section 9, be issuable on the  exercise  of any Warrant (or  specified  portions
thereof),  the Company shall  purchase such fraction for an amount in cash equal
to the same  fraction of the current  market  price per share of Common Stock on
the date of exercise  which  price  shall be the last sale price,  or in case no
sale takes place on such day, the average of the closing bid and asked prices on
the  principal  national  securities  exchange on which the Common  Stock of the
Company is traded, or if not traded on any national  exchange,  then the average
of the closing bid and asked  prices as quoted on the  National  Association  of
Securities  Dealers Automated  Quotation System ("NASDAQ") or as reported by the
National Quotation Bureau, Inc. or similar reporting organization.

         10.  Restriction on  Dispositions.  The Warrants and the Warrant Shares
have not been  registered  under the Act.  The  Warrant  Holder  represents  and
warrants to the Company  that it  understands  that neither the Warrants nor the
Warrant  Shares  may  be  transferred   except  pursuant  to  (i)  an  effective
Registration Statement under the Act, or (ii) any available
                                                         5





rule or exemption from registration under the Act permitting such disposition of
securities and an opinion of counsel, reasonably satisfactory to counsel for the
Company, that an exemption from such registration is available.

         11.  Certificates  to Bear Legends.  The Warrants shall be subject to a
stop-transfer order and the certificate or certificates  therefor shall bear the
following legend:

         NEITHER THE WARRANTS REPRESENTED BY THIS CERTIFICATE NOR THE SECURITIES
         ISSUABLE UPON EXERCISE HEREOF MAY BE OFFERED OR SOLD EXCEPT PURSUANT TO
         (i) AN EFFECTIVE  REGISTRATION  STATEMENT  UNDER THE  SECURITIES ACT OF
         1933 OR (ii) ANY AVAILABLE  RULE OR EXEMPTION FROM  REGISTRATION  UNDER
         SUCH ACT RELATING TO THE  DISPOSITION  OF SECURITIES  AND AN OPINION OF
         COUNSEL,  REASONABLY  SATISFACTORY TO COUNSEL FOR THIS COMPANY, THAT AN
         EXEMPTION FROM REGISTRATION UNDER SUCH ACT IS AVAILABLE.

         The Warrant  Shares or other  securities  issued  upon  exercise of the
Warrants  shall be  subject  to a  stop-transfer  order and the  certificate  or
certificates  evidencing  any such  Warrant  Shares or  securities  shall bear a
legend in substantially the following legend:

         THE SHARES  REPRESENTED BY THIS  CERTIFICATE MAY NOT BE OFFERED OR SOLD
         EXCEPT  PURSUANT TO (i) AN EFFECTIVE  REGISTRATION  STATEMENT UNDER THE
         SECURITIES  ACT OF 1933 OR (ii) ANY  AVAILABLE  RULE OR EXEMPTION  FROM
         REGISTRATION  UNDER SUCH ACT RELATING TO THE  DISPOSITION OF SECURITIES
         AND AN OPINION OF COUNSEL,  REASONABLY SATISFACTORY TO COUNSEL FOR THIS
         COMPANY,  THAT  AN  EXEMPTION  FROM  REGISTRATION  UNDER  SUCH  ACT  IS
         AVAILABLE.

         12.  Representations  and Warranties of Warrant  Holder.  In connection
with the issuance of the Warrants,  the Warrant Holder represents to the Company
by acceptance of the Warrants as follows:

                  (a) The  Warrant  Holder  is aware of the  Company's  business
affairs and financial condition,  and has acquired information about the Company
sufficient  to reach an  informed  and  knowledgeable  decision  to acquire  the
Warrants.  The Warrant  Holder is acquiring the Warrants for its own account for
investment  purposes  only and not with view to, or for the resale in connection
with, any "distribution" thereof in violation of the Act.

                  (b) The  Warrant  Holder  understands  that the  Warrants  and
Warrant  Shares  have not  been  registered  under  the Act in  reliance  upon a
specific exemption therefrom,  which exemption depends upon, among other things,
the bona fide  nature of the Warrant  Holder's  investment  intent as  expressed
herein.

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                  (c) The Warrant Holder further  understands  that the Warrants
and  any  Warrant  Shares  to be  issued  upon  exercise  hereof  must  be  held
indefinitely unless subsequently  registered under the Act and either registered
or qualified under any applicable state  securities  laws, or unless  exemptions
from such registration and qualification are otherwise available.

                  (d) The Warrant  Holder agrees that it will not dispose of any
of  the  Warrants  or  Warrant  Shares  except  pursuant  to  (i)  an  effective
registration  statement under the Act (and, in such case, in compliance with all
prospectus  delivery or other requirements to sell pursuant to such registration
statement),  (ii)  Rule 144  under the Act (or any  similar  rule  under the Act
relating to the  disposition  of securities) or (iii) an opinion of counsel that
an exemption from registration is available.

         13.  Registration  Rights.  The Company hereby  covenants and agrees to
grant  certain  registration  rights to the Warrant  Holder with  respect to the
Warrant Shares, as follows:

                  (a) If the Company proposes to register any of its securities,
either for its own account or the  account of others,  solely for cash under the
Securities Act of 1933, as amended (the  "Securities  Act"),  either for its own
account or the account of others  (other than any  registration  effected by the
Company to implement an employee benefit plan or for a transaction to which Rule
145 or any similar rule under the  Securities Act is  applicable),  it will give
written notice to the Warrant Holder of its intention to do so. Upon the written
request of the Warrant Holder received by the Company within ten (10) days after
the date of any such notice  (which  request shall specify the amount of Warrant
Shares  intended to be disposed of by the Warrant Holder and the intended method
of  disposition  thereof),  the Company  will use its best efforts to effect the
registration,   in  a  registration  statement  (the  "Registration  Statement")
covering the securities to be offered by the Company,  of the  securities  which
the Company has been so  requested  to register by the Warrant  Holder and other
security holders;  provided, that if, at any time after giving written notice of
its intention to register any  securities and prior to the effective date of the
Registration  Statement,  the  Company  shall  determine  for any  reason not to
register or to delay  registration of such  securities,  the Company may, at its
election,  give  written  notice  of such  determination  to each  holder  whose
securities are to be included in the Registration Statement and, thereupon,  (i)
in the  case of a  determination  not to  register,  shall  be  relieved  of its
obligation to register any securities in connection with such registration,  and
(ii) in the case of a determination to delay registering,  shall be permitted to
delay registering any securities for the same period as the delay in registering
such other  securities;  provided  further,  that in the case of an underwritten
registration, the Company shall not be required to register securities in excess
of the amount,  if any, which the principal  underwriter shall reasonably and in
good faith agree in writing to include in such registration.  Any Warrant Shares
and any securities of any other security holder who holds  securities  requested
to be included in such registration which are not included for this reason shall
be included  (subject,  first,  to the inclusion of all  securities  the Company
proposes to register and sell, if any) on a pro rata

                                                         7





basis in proportion  to the  respective  holdings of securities  requested to be
included in such registration.  The Warrant Holder shall be entitled to exercise
the  registration   rights  described  herein  only  once;   provided  that  the
Registration  Statement  becomes and remains  effective for at least ninety (90)
days.  The  Company  shall  pay  its  own  expenses  in  connection   with  such
registration;  the Warrant Holder shall pay all fees and expenses of the Warrant
Holder's  own  counsel  and the  Warrant  Holder's  proportionate  share  of all
registration  and  qualification  fees  and  expenses  (including  underwriters'
discounts and  commissions) and other expenses that result from the inclusion of
the Warrant  Shares in such  registration.  The Warrant Holder shall provide the
Company in a signed writing such information  about the Warrant Holder as in the
opinion  of  securities  counsel to the  Company  shall be either  necessary  or
reasonably  appropriate  to enable the Company to comply with the Securities Act
and applicable state securities laws.

         (b) The  Company  shall use its best  efforts to  register,  qualify or
obtain  exemption from  registration  or  qualification  for, the Warrant Shares
covered by the  Registration  Statement under such other  securities or blue sky
laws of such jurisdictions as the Company  determines to register  securities to
be sold by the Company.

         (c)  Notwithstanding  the  foregoing,  the  Company  (i)  shall  not be
obligated to register  Warrant  Shares held by the Warrant Holder if the Company
shall furnish the Warrant  Holder with a written  opinion of counsel  reasonably
satisfactory  to the  Warrant  Holder,  that the  Warrant  Shares  sought  to be
registered may be publicly offered,  sold and distributed  without  registration
under the  Securities  Act  pursuant to Rule 144 without  restriction  as to the
amount  of  securities  that can be sold;  and (ii) if the  registration  herein
described is an underwritten offering,  shall have no obligation to register the
Warrant  Holder's  Warrant  Shares,  unless the  Warrant  Holder  enters into an
underwriting  agreement in customary form with the  underwriter or  underwriters
selected for the offering by the Company,  and enters into such other agreements
(including,  but not limited to, holdback or lock-up  agreements and a customary
and  reasonable  agreement to  indemnify  the Company and any  underwriter)  and
provides  such  documents  as are  customary  and  reasonable  for  underwritten
offerings.

         14. Notices to Warrant Holders.  Nothing contained in this Agreement or
in any of the Warrants shall be construed as conferring upon the Warrant Holders
thereof  the right to vote or to receive  dividends  or to consent or to receive
notice as  stockholders  in  respect  of the  meetings  of  stockholders  or the
election  of  directors  of the  Company  or any  other  matter,  or any  rights
whatsoever as stockholders of the Company; provided,  however, that in the event
a meeting of the  stockholders  shall be called to consider and take action on a
proposal for the voluntary dissolution of the Company,  other than in connection
with a consolidation,  merger,  sale or transfer of all of substantially  all of
its assets,  business and good will as an  entirety,  then and in that event the
Company shall cause a notice  thereof to be sent by  first-class  mail,  postage
prepaid,  at least 10 days prior to the date fixed as a record  date or the date
of closing the transfer  books in relation to such meeting,  to each  registered
Warrant  Holder of Warrants at such Warrant  Holder's  address  appearing on the
Warrant register; but

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failure  to mail or to  receive  such  notice or any  defect  therein  or in the
mailing  thereof shall not affect the validity of any action taken in connection
with such voluntary dissolution.  If such notice shall have been so given and if
such  voluntary   dissolution  shall  be  authorized  at  such  meeting  or  any
adjournment  thereof,  then  from and  after  the date on which  such  voluntary
dissolution  shall have been duly authorized by the  shareholders,  the Warrants
and all other rights with respect thereto shall cease and terminate.

         15. Notices.  Any notice pursuant to this Agreement to be given or made
to the Company by the Warrant Holder of any Warrants shall be sufficiently given
or made if sent by first-class mail, postage prepaid, addressed as follows:

                                             EDITEK, Inc.
                                             1238 Anthony Road
                                             Burlington, North Carolina 27215
                                             Attention:  Vice President-Finance

         Notices or demands  authorized by this Agreement to be given or made by
the Company to the Warrant Holder and/or  Warrant  Shares shall be  sufficiently
given or made  (except  as  otherwise  provided  in this  Agreement)  if sent by
first-class  mail,  postage  prepaid,  addressed to such  Warrant  Holder at the
address of such Warrant Holder as shown on the Warrant register.

         16.  Governing  Law. This  Agreement and the Warrant  issued  hereunder
shall be governed by and construed in accordance  with the  substantive  laws of
the State of Delaware.

         17.  Counterparts.  This  Agreement  may be  executed  in any number of
counterparts,  each of which so executed shall be deemed to be an original;  but
such counterparts together shall constitute but one and the same instrument.


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

                                   COMPANY:

                                   EDITEK, Inc.



                                   By:_________________________________
                                            Peter J. Health, Vice President
                                            Finance & CFO


                                   WARRANT HOLDER:


                                   -----------------------------------
                                        Samuel C. Powell









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