Document:

EXHIBIT 10.59

                           CONVERTIBLE PROMISSORY NOTE

$50,000.00                                                       JUNE 9, 2000

      1. AMOUNT; MATURITY. FOR VALUE RECEIVED, the undersigned, GENETIC VECTORS,
INC., a Florida  corporation (the "MAKER"),  promises to pay to MICHAEL AND LOIS
HALBERT (the "HOLDER"),  the principal sum of FIFTY THOUSAND  DOLLARS  ($50,000)
which principal sum shall mature on the day that is one hundred and eighty (180)
days from the date hereof (the "MATURITY  DATE") and shall bear simple  interest
at the rate set forth herein.

      2.  INTEREST.  Interest  shall  accrue  as of the date of this Note at the
simple  interest rate of twelve percent (12%) per annum.  All accrued but unpaid
interest shall be due and payable on the Maturity Date.

      3. MODE OF PAYMENT.  All payments of principal and interest due under this
Note shall be made in legal tender of the United States of America and delivered
to the Holder at or, at the option of the  Holder,  in such other  manner and at
such other place as the Holder shall have designated to the Maker in writing.

        4.    PREPAYMENT.

            (a)  This  Note  may be  voluntarily  prepaid,  without  penalty  or
premium,  in whole or in part, at any time and from time to time. Any prepayment
must include all accrued  interest on the principal  being prepaid,  through the
date of prepayment.

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            (b)  Subject  to Section 5 hereof,  this Note  shall be  mandatorily
prepaid  in the event  that the  Maker  closes an  offering  of its  securities,
whether through one or more private placements or secondary public offerings, in
which the Maker raises gross proceeds from such  transaction or  transactions of
at least  $5,000,000.  The Maker shall have fifteen (15) business days to make a
mandatory prepayment to the Holder of this Note pursuant to this Section 4(b).

      5. The Holder hereof shall have the following conversion rights:

            (a) Any  Holder of this Note  shall have the right at any time prior
to the payment in full of the principal balance of this Note to convert all (but
not  less  than  all)   amounts   due  under  this  Note  into  fully  paid  and
non-assessable  shares of the Maker's  common stock,  $0.001 par value per share
(the  "COMMON  STOCK").  The number of shares of Common  Stock (the  "CONVERSION
SHARES")  into which this Note may be converted  shall be determined by dividing
(a) the sum of all amounts due under this Note (including,  without  limitation,
all  principal  and  accrued  but  unpaid  interest)  up to  and  including  the
Conversion Date (as defined below) by (b) Three Dollars (US $3.00) per share (as
adjusted in accordance with Section 5(d) hereof) (the  "CONVERSION  PRICE").  No
fractional shares of Common Stock or scrip representing  fractional shares shall
be issued upon  conversion  of this Note.  Instead of any  fractional  shares of
Common Stock which would  otherwise be issuable upon conversion of the Note, the
Maker shall pay to the Holder a cash adjustment in respect of such fraction.

            (b) To exercise its  conversion  privilege,  the Holder of this Note
shall  surrender  the  original  Note  representing  the debt  obligation  being
converted to the Maker at its principal office, and shall give written notice to
the Maker at the office that the Holder  elects to convert  such Note.  The Note
surrendered  shall  be  accompanied  by  proper  notice  of  waiver  of the debt
obligation in the form required by the Maker.  The date when such written notice

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is received by the Maker,  together with the original Note representing the debt
obligation  being  converted  and all other  instruments  required by the Maker,
shall be the "CONVERSION  DATE." As promptly as practicable after the Conversion
Date,  the Maker  shall  issue and  deliver  to and in the name of the  Holder a
certificate or certificates for the Conversion Shares.  Such conversion shall be
deemed to have been effective on the Conversion  Date and Holder shall be deemed
to have become the Holder of record of the Conversion Shares at such time.

            (c) From and after the date hereof, until thirty (30) days after the
effective date of a registration statement filed by the Maker in connection with
the registration of its securities with the Securities and Exchange  Commission,
including,  without limitation,  a Form SB-2 Registration Statement,  the Holder
shall have the right by  providing  written  notice to the Maker to exercise its
conversion  privilege.  In the event the Holder  does not make its  election  in
accordance  with the  provisions in this Section 5(c),  the Holder shall receive
the warrants as set forth in Section 5(f) hereof.  In the event the Holder makes
its election in accordance  with the provisions in this Section 5(c), the Holder
shall receive the warrants as set forth in Section 5(e) hereof.

            (d) In the event that the Maker  shall (1) pay a stock  dividend  in
and on shares of its Common  Stock,  (2)  subdivide  its  outstanding  shares of
Common Stock into a greater number of shares, (3) combine its outstanding shares
of  Common   Stock  into  a  smaller   number  of   shares,   or  (4)  issue  by
reclassification  of its shares of Common Stock any shares of its capital stock,
then the Conversion Price in effect  immediately prior thereto shall be adjusted
so that the Holder of this Note surrendered for conversion after the record date
fixing  shareholders  to be  affected by such event shall be entitled to receive
upon conversion the number of such shares of Common Stock which the Holder would
have been  entitled to receive  after the  happening of such event had this Note

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been  converted  immediately  prior to such record  date.  Such  adjustment,  if
applicable,  shall be made on the effective date of such event and shall also be
effective  retroactively  as to the  principal  amount  of this  Note  converted
between such record date and the effective date of the event.

            (e) In the  event  that  the  Holder  shall  elect to  exercise  its
conversion  privilege as set forth in Section 5 hereof, the Holder shall receive
(1) a warrant  from the Maker that  entitles  such Holder to  purchase  from the
Maker 16,665  shares of Common Stock of the Maker at a purchase  price per share
of Six Dollars (U.S. $6.00) (as adjusted in accordance with Section 5(d) hereof)
and (2) a warrant from the Maker that  entitles such Holder to purchase from the
Maker 16,665  shares of Common Stock of the Maker at a purchase  price per share
of Seven Dollars and 10/100 (U.S. $7.10) (as adjusted in accordance with Section
5(d) hereof).

            (f) In the event  that the  Holder  does not elect to  exercise  its
conversion  privilege as set forth in Section 5 hereof, the Holder shall receive
(1) a warrant  from the Maker that  entitles  such Holder to  purchase  from the
Maker 10,000  shares of Common Stock of the Maker at a purchase  price per share
of Six Dollars and 60/100 (U.S.  $6.60) (as adjusted in accordance  with Section
5(d)  hereof)  and (2) a warrant  from the Maker that  entitles  such  Holder to
purchase from the Maker 10,000 shares of Common Stock of the Maker at a purchase
price per share of Eight  Dollars (U.S.  $8.00) (as adjusted in accordance  with
Section 5(d) hereof).

      6.    REGISTRATION RIGHTS

            (a) In the  event  that  the  Holder  shall  elect to  exercise  its
conversion  rights  pursuant to Section 5 hereof and the Maker  shall  receive a
written request, not earlier than one hundred twenty (120) days from the receipt
by the Maker of a minimum  amount of gross  proceeds equal to $5,000,000 in such
offering,  from such Holder that the Maker file a registration  statement  under

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the  Securities  Act of 1933,  as amended (the  "SECURITIES  ACT")  covering the
registration of the shares the Conversion  Shares,  then the Maker shall effect,
as expeditiously as reasonably  possible,  the registration under the Securities
Act of such Conversion  Shares that such Holder  requests to be registered.  The
Maker shall not be required to effect a  registration  pursuant to this  Section
6(a) after the Maker has effected one (1) registration  pursuant to this Section
6(a), and such registration has been declared or ordered effective.

            (b) The Maker shall  notify the Holder of the  Conversion  Shares in
writing  at least  thirty  (30) days  prior to the  filing  of any  registration
statement  under  the  Securities  Act for  purposes  of a  public  offering  of
securities of the Maker (including,  but not limited to, registration statements
relating to  secondary  offerings of  securities  of the Company and will afford
such Holder an opportunity to include in such registration statement all or part
the Conversion  Shares held by such Holder. In the event that the Holder desires
to include in any such registration  statement all or any part of the Conversion
Shares  held by it, the Holder  shall so notify the Maker in wirting  within ten
(10) days after the  above-described  notice from the Maker.  Such notice  shall
state the  intended  method of  disposition  of such  Conversion  Shares by such
Holder. If the Holder decides not to include all of the Conversion Shares in any
registration  statement  thereafter  filed  by  the  Maker,  such  Holder  shall
nevertheless continue to have the right to include such Conversion Shares in any
subsequent  registration statement or registration statements as may be filed by
the Maker with respect to offerings  of its  securities,  all upon the terms and
conditions set forth herein.

      7.  EVENT OF  DEFAULT.  Upon the  occurrence  of any event of  default  as
described  below,  the  Holder  shall have the  remedies  set forth in Section 8
hereof, which remedies shall be exclusive:

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<PAGE>

            (a) any  default,  whether in whole or in part,  shall  occur in the
payment to the Holder of principal,  interest or other item  comprising the Note
as and when due which shall continue for a period of fifteen  business (15) days
after the receipt of written  notice  thereof by the Maker;

            (b) the Maker shall (1) make a general assignment for the benefit of
its  creditors,  (2) apply for or  consent  to the  appointment  of a  receiver,
trustee,  assignee,  custodian sequestrator,  liquidator or similar official for
itself or any of its assets and  properties,  (3) commence a voluntary  case for
relief as a debtor under the United  States  Bankruptcy  Code,  (4) file with or
otherwise  submit to any  governmental  authority any petition,  answer or other
document seeking (A) reorganization, (B) an arrangement with creditors or (C) to
take  advantage  of any  other  present  or  future  applicable  law  respecting
bankruptcy,  reorganization,   insolvency,  readjustment  of  debts,  relief  of
debtors,  dissolution or liquidation, (5) file or otherwise submit any answer or
other  document  admitting or failing to contest the material  allegations  of a
petition  or other  document  filed or  otherwise  submitted  against  it in any
proceeding  under any such  applicable  law, or (6) be  adjudicated  bankrupt or
insolvent by a court of competent  jurisdiction;  or

            (c) any case,  proceeding or other action shall be commenced against
the Maker for the purpose of effecting, or an order, judgment or decree shall be
entered by any court of competent  jurisdiction  approving (in whole or in part)
anything specified in Section 7(b) hereof, or any receiver,  trustee,  assignee,
custodian,  sequestrator,  liquidator or other  official shall be appointed with
respect to the Maker, or shall be appointed to take or shall  otherwise  acquire
possession or control of all or a substantial  part of the assets and properties
of the Maker, and any of the foregoing shall continue unstayed and in effect for
any period of ninety (90) days.

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      8.  EXCLUSIVE  REMEDIES UPON EVENT OF DEFAULT.  Upon the  occurrence of an
event of default as described  in Section 7 hereof,  any Holder of this Note may
exercise one of the following  exclusive remedies by providing the Maker written
notice of the Holder's choice of remedies hereunder within fifteen (15) business
days  after the  occurrence  of an event of default  as  described  in Section 7
hereof and upon the expiration of any notice or cure period described herein:

            (a) The Holder of this Note shall have the right to convert all (but
not less than all) amounts due under this Note into Common  Stock in  accordance
with the conversion  procedures as set forth in Section 5(b) hereof.  The number
of shares of Common Stock into which this Note may be converted pursuant to this
Section  8(a) shall be  determined  by  dividing  (i) the sum of all amounts due
under this Note (including,  without  limitation,  all principal and accrued but
unpaid  interest) up to and including the Conversion  Date by (ii) Three Dollars
(US $3.00) per share (as adjusted in accordance  with Section 5(d)  hereof).  No
fractional shares of Common Stock or scrip representing  fractional shares shall
be issued upon  conversion  of this Note.  Instead of any  fractional  shares of
Common Stock which would  otherwise be issuable upon conversion of the Note, the
Maker shall pay to the Holder a cash adjustment in respect of such fraction; or

            (b) The Holder of this Note shall have the right to the repayment in
cash of all  amounts  due under this Note,  in which case such  Holder  shall be
entitled  to  receive a warrant  from the Maker  that  entitles  such  Holder to
purchase  from the Maker Ten  Thousand  (10,000)  shares of Common  Stock of the
Maker at a purchase  price per share of Five  Dollars (US $5.00) (as adjusted in
accordance with Section 5(d) hereof) for each month that such principal  balance
remains unpaid up to a maximum of six (6) months. Any warrants issuable pursuant

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to this Section  8(b) shall be issued to the Holder on the last  business day of
each month each such warrant is due.

      9.  DELAY IN  EXERCISE  OF  RIGHTS.  No delay on the part of the Holder in
exercising  any of its  options,  powers or  rights  nor any  partial  or single
exercise of its options, power or rights shall constitute a waiver thereof or of
any other option, power or right, and no waiver on the part of the Holder of any
of its options,  powers or rights shall constitute a waiver of any other option,
power or right.

      10.  WAIVER  OF  PRESENTMENT.  The Maker  hereby  waives  presentment  for
payment,  dishonor,  protest,  notice of protest and any demand  whatsoever with
respect to this Note.

      11. GOVERNING LAW.

            (a) This  Note and the  rights  of the  parties  hereunder  shall be
governed by and construed in  accordance  with the laws of the State of Florida,
without regard to its conflicts of law principles.  All parties hereto (1) agree
that any legal  suit,  action or  proceeding  arising out of or relating to this
note shall be instituted only in a Federal or state court in Miami-Dade  County,
Florida,  (2) waive any  objection  which they may now or hereafter  have to the
laying of the venue of any such suit, action or proceeding,  including,  without
limitation,  any  objection  based  on  the  assertion  that  such  venue  is an
inconvenient  forum  and (3)  irrevocably  submit  to the  jurisdiction  of such
Federal or state court in Miami-Dade County, Florida in any such suit, action or
proceeding.  All  parties  hereto  agree that the  mailing of any process in any
suit,  action or proceeding.  in accordance  with the notice  provisions of this
Note shall constitute personal service thereof.

            (b) THE MAKER HEREBY  WAIVES ANY RIGHT TO TRIAL BY JURY IN ANY LEGAL
PROCEEDING RELATED IN ANY WAY TO THIS NOTE.

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      12. NOTICES. All notices or other communications  required or permitted to
be given  pursuant to this Note shall be in writing and shall be  considered  as
duly given on (a) the date of delivery,  if delivered in person or by nationally
recognized  overnight  delivery  service or (b) ten (10) days  after  mailing if
mailed by certified  mail,  return  receipt  requested to the party  entitled to
receive  the same,  if to the  Holder,  at his or its  address  on the books and
records of the Maker, and if to the Maker, to Genetic  Vectors,  Inc., 5201 N.W.
77th Avenue,  Suite 100, Miami, Florida 33166,  Attention:  Mead M. McCabe, Jr.,
with a copy to Kirkpatrick & Lockhart LLP, Miami Center - 20th Floor,  201 South
Biscayne Boulevard, Miami, Florida 33131, Attention: Clayton E. Parker, Esq. Any
party may change its address by giving notice to the other party stating its new
address.  Commencing  on the tenth  (10th) day after the giving of such  notice,
such newly  designated  address shall be such party's address for the purpose of
all notices or other  communications  required or permitted to be given pursuant
to this Note.

      13.  AMENDMENT.  This Note shall not be amended  without the prior written
consent of the Holder and the Maker.

                                       GENETIC VECTORS, INC.

                                       By:
                                           -------------------------------------
                                      Its:
                                           -------------------------------------

                                       9EXHIBIT 10.60
                                  -------------

         THIS WARRANT AND THE  UNDERLYING  SHARES OF COMMON STOCK  ISSUABLE UPON
ITS EXERCISE  HAVE NOT BEEN  REGISTERED  UNDER THE  SECURITIES  ACT OF 1933,  AS
AMENDED  (THE  "ACT"),  OR ANY STATE  SECURITIES  LAWS,  AND NO SALE OR TRANSFER
THEREOF  MAY BE  EFFECTED  WITHOUT AN  EFFECTIVE  REGISTRATION  STATEMENT  OR AN
OPINION  OF COUNSEL  FOR THE  HOLDER,  SATISFACTORY  TO THE  COMPANY,  THAT SUCH
REGISTRATION IS NOT REQUIRED UNDER THE ACT AND ANY APPLICABLE  STATE  SECURITIES
LAWS.

No.

                          COMMON STOCK PURCHASE WARRANT
                          -----------------------------

         THIS  WARRANT is issued in  connection  with that  certain  Convertible
Promissory  Note in the  principal  amount of  $50,000.00,  dated as of the date
hereof (the "Note").

         GENETIC VECTORS,  INC., a Florida  corporation (the "COMPANY"),  hereby
certifies that, for value received,  MICHAEL AND LOIS HALBERT (the "HOLDER"), or
its registered  permitted assigns,  is entitled,  subject to the terms set forth
below, to purchase from the Company at any time or from time to time before 5:00
P.M.,  Eastern  Time,  on May 8,  2005,  the  number of shares of fully paid and
non-assessable  shares of common stock,  par value $0.001 per share (the "COMMON
STOCK"),  of the  Company as set forth in the Note and at a  purchase  price per
share as set forth in such Note (the "PURCHASE PRICE"). The number and character
of such shares of Common Stock are subject to adjustment as provided herein.

         As used  herein  the  following  terms,  unless the  context  otherwise
requires, have the following respective meanings:

         (a)      The term  "COMPANY"  shall include  Genetic  Vectors,  Inc., a
Florida  corporation,  and any ------- corporation which shall succeed or assume
the obligations of the Company hereunder.

         (b)      The term "COMMON STOCK"  includes the Company's  Common Stock,
par value  $0.001  per share,  as  authorized  on the date  hereof and any other
securities  into which or for which any of such Common Stock may be converted or
exchanged pursuant to a plan of recapitalization,  reorganization,  merger, sale
of assets or otherwise.

         1.       EXERCISE OF WARRANT.
                  -------------------

                  1.1. FULL  EXERCISE.  This Warrant may be exercised in full by
the Holder by  surrender  of this  Warrant,  with the form of Notice of Exercise
attached  hereto as Exhibit "A" (the  "EXERCISE  NOTICE")  duly  executed by the
Holder, to the Company at its principal office,  accompanied by payment, in cash
or by certified or official bank check or wire transfer  payable to the order of
the  Company,  in the amount  obtained  by  multiplying  the number of shares of
Common Stock for which this Warrant is then exercisable by the Purchase Price.

<PAGE>

                  1.2. PARTIAL  EXERCISE.  This Warrant may be exercised in part
by surrender of this Warrant in the manner and at the place  provided in Section
1.1 except that the amount payable by the Holder on such partial  exercise shall
be the amount  obtained by multiplying  (a) the number of shares of Common Stock
designated by the Holder in the Exercise  Notice by (b) the Purchase  Price.  On
any such  partial  exercise,  the  Company  will issue and deliver to the Holder
hereof a new Warrant or Warrants of like tenor, in the name of the Holder hereof
or such  other  person  as such  Holder  (upon  payment  by such  Holder  of any
applicable transfer taxes) may request,  reflecting in the aggregate on the face
or faces thereof for the number of shares of Common Stock for which such Warrant
or Warrants may still be exercised.

         2.       DELIVERY OF STOCK CERTIFICATES,  ETC. ON EXERCISE.  As soon as
practical after the exercise of this Warrant in full or in part, the Company, at
its expense  (including the payment by it of any applicable  issue taxes),  will
cause to be issued in the name of and  delivered to the Holder  hereof,  or such
other  person as such  Holder  (upon  payment  by the  Holder of any  applicable
transfer taxes and, if requested by the Company,  demonstration by the Holder of
compliance  with  applicable  securities  laws) may  direct,  a  certificate  or
certificates  for the number of fully paid and  non-assessable  shares of Common
Stock to which such Holder shall be entitled on such exercise,  plus, in lieu of
any  fractional  share to which such Holder would  otherwise  be entitled,  cash
equal to such fraction  multiplied by the then-current  market value of one full
share, together with any other stock or other securities and property (including
cash,  where  applicable)  to which such Holder is entitled  upon such  exercise
pursuant to Section 1 or otherwise.

         3.       ADJUSTMENT FOR REORGANIZATION, CONSOLIDATION, MERGER, ETC.

                  3.1.  REORGANIZATION.  If  the  Company  shall  (a)  effect  a
reorganization, (b) consolidate with or merge into any other person or party, or
(c) transfer all or  substantially  all of its properties or assets to any other
person  under  any plan or  arrangement  contemplating  the  dissolution  of the
Company,  then, in each such case,  the Holder of this Warrant,  on the exercise
hereof as  provided  in  Section 1 at any time  after the  consummation  of such
reorganization,   consolidation   or  merger  or  the  effective  date  of  such
dissolution  as the case may be,  shall  receive,  in lieu of the  Common  Stock
issuable on such exercise prior to such consummation or such effective date, the
stock and other  securities and property  (including  cash) to which such Holder
would have been  entitled  upon such  consummation  or in  connection  with such
dissolution,  as the case may be, if such Holder had so  exercised  this Warrant
immediately  prior  thereto,  all subject to further  adjustment  thereafter  as
provided herein.

                  3.2.   CONTINUATION   OF  TERMS.   Upon  any   reorganization,
consolidation,  merger or transfer (and any dissolution  following any transfer)
referred to in this  Section 3, this  Warrant  shall  continue in full force and
effect and the terms hereof shall be applicable to the shares of stock and other
securities  and property  receivable  on the exercise of this Warrant  after the
consummation of such  reorganization,  consolidation  or merger or the effective
date of dissolution  following any such transfer,  as the case may be, and shall
be binding upon the issuer of any such stock or other securities,  including, in
the case of any such transfer,  the person acquiring all or substantially all of
the  properties or assets of the Company,  whether or not such person shall have
expressly assumed the terms of this Warrant as provided herein.

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<PAGE>

         4. NO DILUTION OR IMPAIRMENT. The Company will not, by amendment of its
Articles of  Incorporation  or through any  reorganization,  transfer of assets,
consolidation,  merger,  dissolution,  issue or sale of  securities or any other
voluntary action, avoid or seek to avoid the observance or performance of any of
the  terms of the  Warrant,  but will at all times in good  faith  assist in the
carrying  out of all such terms and in the  taking of all such  action as may be
necessary or  appropriate  in order to protect the rights of the Holder  against
dilution or other impairment.

         5.       NOTICES OF RECORD DATE, ETC.  In the event of:

                  (a) any taking by the  Company  of a record of the  holders of
any class or securities for the purpose of determining  the holders  thereof who
are  entitled to receive any  dividend  or other  distribution,  or any right to
subscribe for, purchase or otherwise acquire any shares of stock of any class or
any other securities or property, or to receive any other right, or

                  (b)  any   capital   reorganization   of  the   Company,   any
reclassification  or recapitalization of the capital stock of the Company or any
transfer  of  all  or  substantially  all  the  assets  of  the  Company  to  or
consolidation or merger of the Company with or into any other person, or

                  (c)      any voluntary or involuntary dissolution, liquidation
or winding-up of the Company, or

                  (d) any  proposed  (i)  issue or grant by the  Company  of any
shares  of stock of any  class or any  other  securities,  or (ii) any  right or
option to subscribe  for,  purchase or otherwise  acquire any shares of stock of
any class or (iii) any other securities (other than the issue of Common Stock on
exercise of this  Warrant),  which would  require  the  affirmative  vote of the
shareholders  of the  Company  according  to its  Articles of  Incorporation  or
applicable state law, then and in each such event the Company will mail or cause
to be mailed to the  Holder a notice  specifying  (i) the date on which any such
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;
(ii)   the   date  on   which   any   such   reorganization,   reclassification,
recapitalization,  transfer, consolidation,  merger, 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 shall be entitled to exchange their shares
of  Common  Stock  for  securities  or  other   property   deliverable  on  such
reorganization,  reclassification,  recapitalization,  transfer,  consolidation,
merger,  dissolution,  liquidation  or  winding-up;  and  (iii) the  amount  and
character  of any stock or other  securities,  or rights or options with respect
thereto,  proposed to be issued or granted,  the date of such proposed  issue or
grant and the persons or class of persons to whom such  proposed  issue or grant
is to be offered or made.  Such notice shall be mailed at least twenty (20) days
prior to the date  specified  in such  notice on which any such  action is to be
taken.

         6.  RESERVATION OF STOCK  ISSUABLE ON EXERCISE OF WARRANT.  The Company
will at all times reserve and keep  available,  solely for issuance and delivery
on the  exercise of this  Warrant,  all shares of Common Stock from time to time
issuable on the exercise of this Warrant.

                                       3
<PAGE>

         7.  EXCHANGE  OF  WARRANT.  On  surrender  of  this  Warrant,  properly
endorsed,  to the Company,  the Company at its expense will issue and deliver to
or on the order of the Holder  thereof a new  Warrant or Warrants of like tenor,
in the name of such Holder or such other person as such Holder (upon  payment by
such Holder of any  applicable  transfer taxes and, if requested by the Company,
demonstration by such Holder of compliance with applicable  securities laws) may
direct,  calling in the aggregate on the face or faces thereof for the number of
shares  of  Common  Stock  called  for on the face or faces  of the  Warrant  or
Warrants so surrendered.

         8.   REPLACEMENT  OF  WARRANT.   On  receipt  of  evidence   reasonably
satisfactory  to the Company of the loss,  theft,  destruction  or mutilation of
this  Warrant  and, in the case of any such loss,  theft or  destruction  of the
Warrant,   on  delivery  of  an  indemnity   agreement  or  security  reasonably
satisfactory  in form and  amount  to the  Company  or,  in the case of any such
mutilation,  on surrender and  cancellation of such warrant,  the Company at its
expense will execute and deliver, in lieu thereof, a new Warrant of like tenor.

         9.       NEGOTIABILITY.  This  Warrant  is  issued  upon the  following
terms, to all of which each Holder or owner hereof by the taking hereof consents
and agrees:

                  (a) subject to compliance with all applicable securities laws,
title to this Warrant may be transferred  by  endorsement  (by the Holder hereof
executing the Form of Assignment attached hereto as EXHIBIT "B") and delivery in
the  same  manner  as in the case of a  negotiable  instrument  transferable  by
endorsement and delivery;

                  (b) any person in possession of this Warrant properly endorsed
is authorized to represent  himself as absolute owner hereof and is empowered to
transfer absolute title hereto by endorsement and delivery hereof to a BONA FIDE
purchaser  hereof for value;  each prior taker or owner waives and renounces all
of his  equities  or  rights  in this  Warrant  in favor of each  such BONA FIDE
purchaser, and each such BONA FIDE purchaser shall acquire absolute title hereto
and to all rights represented hereby; and

                  (c) until  this  Warrant  is  transferred  on the books of the
Company,  the Company may treat the  registered  Holder  hereof as the  absolute
owner hereof for all purposes, notwithstanding any notice to the contrary.

         10. NOTICES. All notices or other communications  required or permitted
to be given pursuant to this Warrant shall be in writing and shall be considered
as duly given on (a) the date of delivery, if delivered in person, by nationally
recognized  overnight  delivery  service or (b) ten (10) days  after  mailing if
mailed from within the  continental  United  States by  registered  or certified
mail,  return receipt requested to the party entitled to receive the same, if to
the Company, to Genetic Vectors,  Inc., 5201 N.W. 77th Avenue, Suite 100, Miami,
Florida 33166 Attention:  Mead M. McCabe, Jr., with a copy to Clayton E. Parker,
Esq., Kirkpatrick & Lockhart LLP, 201 S. Biscayne Boulevard,  20th Floor, Miami,
Florida 33131, and if to the Holder,  at the address of such Holder shown on the
books of the Company.  Any party may change his or its address by giving  notice
to the other party  stating his or its new address.  Commencing  on the 10th day
after the giving of such  notice,  such  newly  designed  address  shall be such
party's address for the purpose of all notices or other communications  required
or permitted to be given pursuant to this Warrant.

                                       4
<PAGE>

         11. GOVERNING LAW. This Warrant and the rights of the parties hereunder
shall be governed by and construed in  accordance  with the laws of the State of
Florida,  without regard to its conflicts of law principles.  All parties hereto
(i) agree that any legal suit,  action or proceeding  arising out of or relating
to this  Warrant  shall  be  instituted  only in a  federal  or  state  court in
Miami-Dade  County,  Florida;  (ii)  waive any  objection  which they may now or
hereafter  have  to the  laying  of  the  venue  of any  such  suit,  action  or
proceeding;  and (iii) irrevocably submit to the jurisdiction of such federal or
state  court  in  Miami-Dade  County,  Florida  in  any  such  suit,  action  or
proceeding,  but such consent  shall not  constitute a general  appearance or be
available  to any other person who is not a party to this  Warrant.  All parties
hereto  agree  that  the  mailing  of any  processing  of any  suit,  action  or
proceeding  in  accordance  with the notice  provisions  of this  Warrant  shall
constitute personal service thereof.

         12. ENTIRE AGREEMENT;  WAIVER OF BREACH.  This Warrant  constitutes the
entire  agreement  among the  parties  and  supersedes  any prior  agreement  or
understanding  among them with respect to the subject matter hereof,  and it may
not be modified or amended in any manner other than as provided  herein,  and no
waiver  of any  breach  or  condition  of this  Warrant  shall be deemed to have
occurred  unless  such waiver is in writing,  signed by the party  against  whom
enforcement  is  sought,  and no waiver  shall be  claimed to be a waiver of any
subsequent breach or condition of a like or different nature.

         13.  SEVERABILITY.  If any  provision  of this  Warrant  shall  be held
invalid or unenforceable,  such invalidity or unenforceability shall attach only
to such  provision  and shall not in any  manner  affect  or render  invalid  or
unenforceable  any other severable  provision of this Warrant,  and this Warrant
shall be carried out as if any such invalid or unenforceable  provision were not
contained herein.

         14.  AMENDMENT.  This  Warrant  and any  term  hereof  may be  changed,
waived,  discharged or terminated only by an instrument in writing signed by the
party against which enforcement of such change, waiver, discharge or termination
is sought. 15. Restrictions on  Transferability;  Restrictive Legend. The Holder
acknowledges  that the shares of Common  Stock  issuable  upon  exercise of this
Warrant  are  subject  to  restrictions   under  applicable  Federal  and  state
securities  laws. Each  certificate  representing  shares of Common Stock issued
shall, upon the exercise of this Warrant, bear the following legends in addition
to such other restrictive legends as may be required by law:

         "The shares  represented by this  certificate  have not been registered
under  the  Securities  Act of  1933,  as  amended  (the  "ACT"),  or any  state
securities  laws,  and no sale or transfer  thereof  may be effected  without an
effective  registration  statement  or an  opinion of  counsel  for the  Holder,
satisfactory  to the  Company and its  counsel,  that such  registration  is not
required under the Act and any applicable state securities laws."

         Dated:   June 9, 2000

                              GENETIC VECTORS, INC.

                                       5
<PAGE>

                              By:
                                       -----------------------------------------
                              Title:   Mead McCabe, Jr., Chief Executive Officer

AGREED TO AND ACCEPTED:

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

By:
   -----------------------------
      Name:
           ---------------------
      Title:
            --------------------

Date:
     ---------------------------

                                       6
<PAGE>

                                       A-1

                                   EXHIBIT "A"
                                   -----------

                                FORM OF EXERCISE
                                ----------------

                   (TO BE SIGNED ONLY ON EXERCISE OF WARRANT)

TO:

         The undersigned,  the Holder of the within Warrant,  hereby irrevocably
elects to exercise this Warrant for, and to purchase  thereunder _____ shares of
Common Stock of  ____________________,  herewith  makes  payment of  $__________
therefor,  and requests that the  certificates  for such shares be issued in the
name of, and delivered to, whose address is:

         ____________________________________________________________

         ____________________________________________________________

         ____________________________________________________________

         Dated:   ___________________.

                                             -----------------------------------
                                             Signature
                                             (Signature must conform to name of
                                             holder as specified on the face of
                                             the Warrant)

                                             -----------------------------------
                                             Print Name

                                             -----------------------------------
                                             Street Address

                                             -----------------------------------
                                             City, State and Zip Code

                                             -----------------------------------
                                             Person's Social Security Number or
                                             Tax Identification Number

A-1

<PAGE>

                                   EXHIBIT "B"
                                   -----------

                               FORM OF ASSIGNMENT
                               ------------------

                   (To be signed only on transfer of Warrant)

         For  value  received,   the  undersigned  hereby  sells,  assigns,  and
transfers unto  ___________________  the right represented by the within Warrant
to purchase  shares of Common Stock of  ___________________  to which the within
Warrant relates,  and appoints  ___________________  as its attorney to transfer
such right on the books of _________________  with full power of substitution in
the premises.

         Dated:   _________________.

                                             -----------------------------------
                                             Signature
                                             (Signature must conform to name of
                                             holder as specified on the face of
                                             the Warrant)

                                             -----------------------------------
                                             Print Name

                                             -----------------------------------
                                             Street Address

                                             ----------------------------------_
                                             City, State and Zip Code

                                             -----------------------------------
                                             Person's Social Security Number or
                                             Tax Identification Number

Signed in the presence of:

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

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