Exhibit 4


          SECOND AMENDMENT TO INDENTURE, SECURITIES,
          WARRANT AGREEMENT AND WARRANT CERTIFICATES


     THIS  SECOND  AMENDMENT  TO INDENTURE,  SECURITIES,  WARRANT
AGREEMENT  AND WARRANT CERTIFICATES (this "Second Amendment")  is
made as of and shall be effective for all purposes as of the 28th
day  of March, 2006, by and between Igene Biotechnology, Inc.,  a
Maryland corporation (the "Company"), and American Stock Transfer
&  Trust  Company,  a  New York corporation, its  successors  and
assigns,  as  Trustee (the "Trustee") and as Warrant  Agent  (the
"Warrant Agent").

                            RECITALS

     WHEREAS,  pursuant to the terms of an Indenture dated as  of
March  31, 1998, as amended (the "Indenture") between the Company
and the Trustee, the Company issued and sold $5,000,000 of its 8%
notes due March 31, 2003 (the "Securities"); and

     WHEREAS,  concurrently with the issue of the Securities, the
Company issued, pursuant to a Warrant Agreement dated as of March
31,  1998  (the  "Warrant  Agreement"),  50,000,000  warrants  to
purchase shares of the Company's Common Stock for $.10 per share,
as   adjusted  in  accordance  with  the  terms  of  the  Warrant
Agreement; and

     WHEREAS,  on  March 18, 2003, the Company and the Consenting
Holders  (as defined below) amended the Indenture and  Securities
to  reflect  the extension of the maturity date on the Securities
to March 31, 2006; and

     WHEREAS,  the  Company and the Consenting Holders desire  to
further   amend  the  Indenture  and  Securities  as  hereinafter
provided  to  reflect the extension of the maturity date  on  the
Securities from March 31, 2006 until March 31, 2009; and

     WHEREAS,  in return for amending the Indenture and extending
the  maturity date on the Securities, the Consenting Holders  and
the  Company  desire to amend the terms of the Warrant  Agreement
and  each of the Warrant Certificates (within the meaning of  the
Warrant  Agreement) as hereinafter provided to reduce the Warrant
Price  (as defined in the Warrant Agreement) from $.075 to $.056;
and

     WHEREAS,  the  terms contained in this Second Amendment  are
consented  to  by  the  holders of at least two-thirds  principal
amount   of   all   Securities  (collectively,  the   "Consenting
Holders");

     NOW, THEREFORE, in consideration of the  foregoing recitals,
and other  good  and  valuable  consideration,   the receipt  and
sufficiency of which are hereby acknowledged, the parties to this
Second Agreement hereby agree as follows:

     1.   Incorporation of Recitals.
          _________________________

          The foregoing recitals are incorporated in this  Second
Amendment and made a  part hereof  by  this reference to the same
extent  as if  set  forth herein in full.  All section references
shall,  unless otherwise  expressly  indicated,  mean the corres-
ponding  section  of  the Indenture.

     2.   Definitions.
          ___________

          All capitalized terms used but not defined herein shall
have the meanings given such terms in the Indenture.

     3.   Amendment of the Indenture and Securities.
          _________________________________________

          The  Indenture  and  each  of the Securities are hereby
amended  to  replace  "March  31,  2006"  with  "March 31,  2009"
wherever  such  term  may  appear, thereby extending the maturity
date of the Securities until March 31, 2009.

     4.   Amendment of Warrant Agreement.
          ______________________________

          The  Warrant Agreement  and each Warrant Certificate is
hereby amended to replace "$.075" with "$.056" wherever such term
may appear.

     5.   Ratification   of   Indenture,    Securities,   Warrant
          Agreement and Warrant Certificates.
          _______________________________________________________

          Except as set  forth in this  Second Amendment, all the
terms  and  conditions  contained in  the  Indenture, Securities,
Warrant Agreement or  Warrant Certificates, each, as amended, are
hereby ratified and shall remain in full force and effect. In the
event that any of the terms,  conditions  and  provisions of this
Second Amendment shall conflict with any of the terms, conditions
and provisions of the Indenture, Securities, Warrant Agreement or
Warrant Certificates, each, as amended, then, and in  such event,
the  terms, conditions and provisions of  this  Second  Amendment
shall prevail and be controlling.   Hereafter,  all references to
the  Indenture,  Securities,  Warrant  Agreement  or any  Warrant
Certificate   shall  mean   the  Indenture,  Securities,  Warrant
Agreement or such Warrant  Certificate,  respectively, as amended
by this Second Amendment.

     6.   Effective Date of Second Amendment.
          __________________________________

          The  effective  date  of this Second Amendment shall be
March 28, 2006.

     7.   Counterparts.
          ____________

          This Second Amendment may be executed in any  number of
counterparts, each of which shall be deemed an  original, and all
of  which,  when  taken together, shall  be deemed to be a single
instrument.

     8.   Applicable Law.
          ______________

          This Second Amendment shall  be governed by the laws of
the  State  of  New York, without  regard to its conflicts of law
rules.

     9.   Disclaimer.
          __________

          In  accordance  with  Section  7.04  of  the Indenture,
American Stock Transfer and Trust Company makes no representation
or  warranty  as  to  the  validity  or  adequacy  of this Second
Amendment  and  shall  not be responsible for any of the recitals
set forth herein.




     IN  WITNESS  WHEREOF,  and  intending  to be legally  bound,
the  Company,  Trustee and Warrant Agent have caused this  Second
Amendment  to   be  executed  on  their   behalf  by  their  duly
authorized representatives as of the date set forth above.


ATTEST:                       THE COMPANY:

                              IGENE BIOTECHNOLOGY, INC.


/s/ CHRISTINE L. FITCH        By:   /s/ STEPHEN F. HIU
_________________________           _________________________
    CHRISTINE L. FITCH        Name:     STEPHEN F. HIU
                              Title:    President



ATTEST:                       THE TRUSTEE AND WARRANT AGENT:

                              AMERICAN STOCK TRANSFER &
                              TRUST COMPANY


/s/ SUSAN SILBER              By:   /s/ HERBERT J. LEMMER
_______________________       _______________________________
    SUSAN SILBER              Name:     HERBERT J. LEMMER
                              Title:    Vice President


                 CONSENT OF CONSENTING HOLDERS

       Each  of  the  undersigned,  collectively  constituting
holders  of  at  least two-thirds in principal amount  of  all
Securities,  do hereby irrevocably consent, on behalf  of  all
holders  of Securities pursuant to and in accordance with  the
terms  of  the Indenture, to the amendment of the  Securities,
the   Indenture,  the  Warrant  Agreement  and   the   Warrant
Certificates, as set forth in this Second Amendment.  Each  of
the  persons  signing below in their capacity  as  trustee  on
behalf  of  any trust represent that they currently  serve  as
trustee  under  the  trust(s) listed immediately  above  their
names,  and  have the trust power and authority to sign  below
and  to bind the trust(s) listed immediately above their names
to  this Consent of Consenting Holders in accordance with  its
terms.


CONSENTING HOLDERS:

WITNESS:

/s/ PATRICIA SPERA             /s/ THOMAS L. KEMPNER
_______________________        _______________________________
    PATRICIA SPERA                 THOMAS L. KEMPNER, record
                                   and beneficial holder of
                                   $32,395 principal amount of
                                   Securities

WITNESS:

/s/ MARY CLANCY                /s/ SIDNEY R. KNAFEL
_______________________        _______________________________
    MARY CLANCY                    SIDNEY R. KNAFEL, record
                                   holder of $1,214,544
                                   principal amount of
                                   Securities


WITNESS:                       Trust U/W of Carl M. Loeb FBO
                               Thomas L. Kempner, beneficial
                               and record holder of $944,933
                               principal amount of Securities


/s/ PATRICIA SPERA             /s/ THOMAS L. KEMPNER
_______________________        _______________________________
    PATRICIA SPERA                 THOMAS L. KEMPNER
                                   Trustee

/s/ PATRICIA SPERA             /s/ WILLIAM PERLMUTH
_______________________        _______________________________
    PATRICIA SPERA                 WILLIAM PERLMUTH
                                   Trustee




WITNESS:                       Alan H. Kempner III, beneficial
                               and record holder of $942,773
                               principal amount of Securities


/s/ PATRICIA SPERA             /s/ ALAN H. KEMPNER III
_______________________        _______________________________
    PATRICIA SPERA                 ALAN H. KEMPNER III


WITNESS:                       Trust U/A dated 9/13/1978
                               FBO Andrew G. Knafel, holder of
                               $340,341.50 principal amount of
                               Securities


/s/ ANNE HUNTER                /s/ ANDREW G. KNAFEL
_______________________        _______________________________
    ANNE HUNTER                    ANDREW G. KNAFEL
                                   Trustee


WITNESS:                       Trust U/A dated 9/13/1978
                               FBO Douglas R. Knafel, holder
                               of $340,341.50 principal
                               amount of Securities

/s/ ANNE HUNTER                /s/ ANDREW G. KNAFEL
_______________________        ______________________________
    ANNE HUNTER                    ANDREW G. KNAFEL
                                   Trustee