Document:

Exhibit 10.4

ATLANTIC Technology Ventures, Inc.
                                                     The Empire State Building
                                                     350 Fifth Avenue
                                                     Suite 5507
                                                     New York, NY 10118
                                                     Telephone: 212.267.2503
                                                     Fax: 212.267.2159
                                                     www.atlan.com
                                                     -------------

                                                                January 10, 2003

Dr. Waldemar Gottardi
Dr. Marcus Nagl
Dr. Andrew Neher
Institute for Hygiene and Social Medicine
University of Innsbruck
Fritz Pregl Strasse 3
A-6010, Innsbruck
AUSTRIA

     Re:     Assignment of October 18, 2001 License Agreement
             Concerning N-Chlorotaurine

Gentlemen:

     As we have discussed, Atlantic Technology Ventures, Inc. desires to assign
all of its rights and obligations under the October 18, 2001 License Agreement
to Pathogenics, LLC a new corporate entity to be owned by Frederic P. Zotos, A.
Joseph Rudick, and Michael L. Ferrari.

     Article 9 of the abovementioned October 18, 2001 License Agreement provides
as follows:

     "This  Agreement,  the  Patent  Rights  and  the  other  rights  and duties
     appertaining  hereto  may  not  be  assigned  by either party without first
     obtaining  the  written  consent  of the other which shall not otherwise be
     unreasonably  withheld."

     I ask that you indicate your consent to Atlantic's assignment of its rights
and obligations under the License Agreement by countersigning this letter, as
indicated below.

                                             With  best  regards,

                                             /s/ Frederic P. Zotos

                                             Frederic  P.  Zotos,  Esq.
                                             President  &  CEO
                                             Atlantic  Technology Ventures, Inc.

                                  Page 1 of 2
<PAGE>

AGREED  AND  ACCEPTED

By:   /s/ Dr. Waldemar Gottardi
     ------------------------
     Dr. Waldemar Gottardi

By:  /s/ Dr. Markus Nagl
     ------------------------
     Dr. Markus Nagl

By:  /s/ Dr. Andreas Neher
     ------------------------
     Dr. Andreas Neher

                                  Page 2 of 2
<PAGE>Exhibit 10.5
                          REGISTRATION RIGHTS AGREEMENT

     THIS REGISTRATION RIGHTS AGREEMENT (this "Agreement") is made and entered
into as of the 18th day of February, 2005 by and among PATHOGENICS, INC., a
Delaware corporation (the "Company"), and William K. Mackey ("Holder").

                              W I T N E S S E T H:
                              --------------------

     WHEREAS, the Holder is the owner of Nine Hundred Thousand (900,000) shares
of common stock of the Company, par value $.001 per share; and

     WHEREAS, the Company and the Holder desire to enter into this Agreement.

     NOW, THEREFORE, in consideration of the mutual covenants and agreements
contained herein, the parties hereto agree as follows:

     1.     Registration Rights.
            -------------------

     1.1     Definitions.  As used herein:
             -----------

               (a) The terms "register," "registered" and "registration" refer
          to a registration effected by preparing and filing with the Securities
          and Exchange Commission (the "SEC") a registration statement pursuant
          to the Securities Act of 1933, as amended (the "Act"), and the
          declaration or order of effectiveness of such registration statement.

               (b) For the purposes hereof the term "Registerable Securities"
          means shares of (i) common stock, preferred stock or debt securities
          of the Company (the "Securities"), (ii) securities issuable upon
          exercise of warrants or options to purchase common stock, (iii) stock
          or debt securities issued in lieu of the Securities in any
          reorganization which have not been sold to the public and (iv) stock
          issued in respect of the stock referred in (i), (ii) and (iii) as a
          result of a stock split, stock dividend, recapitalization or
          combination, which have not been sold to the public.

               (c) The term "Holder" means William K. Mackey.

          1.2     Incidental  Registration.
                  ------------------------

               (a) If the Company at any time proposes to register any of its
          securities under the Act, whether of its own accord or at the demand
          of any holder of such securities pursuant to an agreement with respect
          to the registration thereof (provided such agreement does not prohibit
          third parties from including additional securities in such
          registration), and if the form of registration statement proposed to
          be used may be used for the registration of Registerable Securities,
          the Company will give notice to Holder not less than 10 days nor more
          than 30 days prior to the filing of such registration statement of its
          intention to proceed with the proposed registration (the "Incidental
          Registration"), and, upon written request of the Holder made within
          ten (10) days after the receipt of any such notice (which request will
          specify the Registerable Securities intended to be disposed of by the
          Holder and state the intended method of disposition thereof), the
          Company will use its best efforts to cause all Registerable Securities
          of Holder as to which registration has been requested to be registered
          under the Act, provided that if such registration is in connection
          with an underwritten public offering, Holder's Registerable Securities
          to be included in such registration shall be offered upon the same
          terms and conditions as apply to any other securities included in such
          registration. Notwithstanding anything contained in this Section 1.2
          to the contrary, the Company shall have no obligation to cause
          Registerable Securities to be registered with respect to any
          Registerable Securities which shall be eligible for resale under Rule
          144(k) of the Securities Act.

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<PAGE>

               (b) If an Incidental Registration is a primary registration on
          behalf of the Company and is in connection with an underwritten public
          offering, and if the managing underwriters advise the Company in
          writing that in their opinion the amount of securities requested to be
          included in such registration (whether by the Company, the Holder, or
          other holders of the Company's securities pursuant to any other rights
          granted by the Company to demand inclusion of any such securities in
          such registration) exceeds the amount of such securities which can be
          successfully sold in such offering, the Company will include in such
          registration the amount of securities requested to be included which
          in the opinion of such underwriters can be sold, in the following
          order (A) first, all of the securities the Company proposes to sell,
          and (B) second, any other securities requested to be included in such
          registration, pro rata among the holders thereof on the basis of the
          amount of such securities then owned by such holders.

               (c) If an Incidental Registration is a secondary registration on
          behalf of holders of securities of the Company and is in connection
          with an underwritten public offering, and if the managing underwriters
          advise the Company in writing that in their opinion the amount of
          securities requested to be included in such registration (whether by
          such holders, by the Holder, or by holders of the Company's securities
          pursuant to any other rights granted by the Company to demand
          inclusion of securities in such registration) exceeds the amount of
          such securities which can be sold in such offering, the Company will
          include in, such registration the amount of securities requested to be
          included which in the opinion of such underwriters can be sold, in the
          following order (A) first, all of the securities requested to be
          included by holders demanding or requesting such registration, and (B)
          second, any other securities requested to be included in such
          registration, pro rata among the holders thereof on the basis of the
          amount of such securities then owned by such holders.

          1.3     Registration Procedures.  The Company will advise the Holder
                  -----------------------
in writing as to the effective date of the registration and as to the completion
thereof.  At its expense the Company will:

               (a) keep the registration effective for a period of days or until
          the Holder has completed the distribution described in the
          registration statement relating thereto, whichever first occurs; and

               (b) furnish such number of prospectuses and any other documents
          incident thereto as the Holder from time to time may reasonably
          request.

          1.4     Indemnification.  To the extent permitted by law, the Company
                  ---------------
will indemnify the Holder against all claims, losses, expenses, damages and
liabilities (or actions in respect thereto) arising out of or based on any
untrue statement (or alleged untrue statement) of a material fact contained in
any prospectus, offering circular or other document (including any related
registration statement, notification or the like) incident to any such
registration, or based on any omission (or alleged omission) to state therein a
material fact required to be stated therein or necessary to make the statements
therein not misleading in light of the circumstances in which they were made, or
any violation by the Company of any rule or regulation promulgated under the Act
or any state securities law applicable to the Company in connection with any
such registration, and will reimburse the Holder for any reasonable legal and
any other expenses incurred in connection with investigating, defending or
settling any such claim, loss, damage, liability or action, provided that the
indemnity contained in this Section shall not apply to amounts paid in
settlement of any such claim, loss, damage, liability or action if such
settlement is effected without the consent of the Company (which consent will
not be reasonably withheld) and provided further that the Company will not be
liable in any such case to the extent that any such claim, loss, damage or
liability arises out of or is based on any untrue statement or omission based
upon written information furnished to the Company by the Holder relating to
Holder.

                                        2
<PAGE>

          1.5     Information by Holder.  The Holder shall promptly furnish to
                  ---------------------
the Company in writing such information regarding the Holder as the Company may
request in writing and as shall be required in connection with any registration
referred to herein.

          1.6     Rule 144 Reporting.  With a view to making available to Holder
                  ------------------
the benefits of certain rules and regulations of the SEC which may permit the
sale of the Registerable Securities to the public without registration, the
Company agrees at all times during the period commencing on the date hereof and
ending upon the termination of the registration rights of Holder pursuant to
Section 1.8, to:

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

               (b) use its best efforts to file with the SEC in a timely manner
          all reports and other documents required of the Company under the
          Securities Exchange Act of 1934, as amended; and

               (c) so long as Holder owns any Registerable Securities, to
          furnish to each Holder forthwith upon Holder's request a written
          statement by the Company as to its compliance with the reporting
          requirements of said Rule 144, a copy of the most recent annual or
          quarterly report of the Company, and such other reports and documents
          so filed by the Company as each Holder may reasonably request in
          availing itself of any rule or regulation of the SEC allowing Holder
          to sell any such securities without registration.

          1.7     "Market Standoff" Agreement.  Holder agrees that, if requested
                  ---------------------------
by the Company and an underwriter of Securities (or other securities) of the
Company, not to sell or otherwise transfer or dispose of any Securities (or
other securities) of the Company held by Holder during a period of up to 120
days as agreed to between the Company and the underwriters following the
effective date of a registration statement of the Company filed under the Act
covering the offer and sale of common stock or other securities of the Company.
The Company may impose stock transfer restrictions with respect to the
Registerable Securities until the end of said 120-day period, provided that:

                                        3
<PAGE>

               (a) such agreement shall only apply to the first registration
          statement of the Company including Securities (or other securities) to
          be sold on its behalf to the public in an underwritten offering; and

               (b) all officers and directors of the Company enter into similar
          agreements.

          Such agreement shall be confirmed in writing in the form satisfactory
to the Company and such underwriter.  The Company may impose stop-transfer
instructions with respect to the Securities (or other securities) subject to the
foregoing restriction until the end of said lock-up period.

          1.8     Termination of Registration Rights.  The registration rights
                  ----------------------------------
granted pursuant to this Section 1 shall terminate as to each Holder at such
time as all Registerable Securities of the Holder can, in the opinion of counsel
to the Company (which opinion shall be concurred in by counsel to the Holders),
be sold within a given three-month period pursuant to Rule 144 or other
applicable exemption.

          1.9     Delay of Registration.  No Holder shall have any right to take
                  ---------------------
any action to restrain, enjoin or otherwise delay any registration as the result
of any controversy that may arise with respect to the interpretation or
implementation of this Section 1.

          1.10     Legend Requirement.  Each stock certificate representing the
                   ------------------
Registerable Securities shall bear a legend in, or substantially in, the
following form and any other legend required by any applicable state securities
or Blue Sky laws:

          "The  shares  represented by this certificate have not been registered
          under  the  Securities  Act  of 1933, as amended, and may not be sold,
          pledged  or  otherwise  transferred  without an effective registration
          under  said  Act  or unless the Company shall have received an opinion
          satisfactory  to  the  Company  of counsel satisfactory to the Company
          than  an exemption from registration under such Act is then available.

          1.11     Prospectus Requirements.  Holder hereby covenants with the
                   -----------------------
Company that he will promptly advise the Company of any changes in the
information concerning Holder contained in a registration statement filed
hereunder and that Holder will not make any sale of Registerable Securities
pursuant to any registration statement without complying with the prospectus
delivery requirements of the 1933 Act.  Holder acknowledges that occasionally
there may be times when the Company must temporarily suspend the use of the
prospectus forming a part of any such registration statement until such time as
an amendment to such registration statement has been filed by the Company and
declared effective by the SEC, the relevant prospectus supplemented by the
Company or until such time as the Company has filed an appropriate report with
the SEC pursuant to the 1934 Act.  During any period in which sales are
suspended and upon notice of such suspension from the Company, Holder agrees not
to sell any such Registerable Securities pursuant to any such prospectus.
Holder covenants that he will not sell Registerable Securities pursuant to any
such prospectus during the period commencing at the time at which the Company
gives Holder notice of the suspension of the use of said prospectus and ending
at the time the Company gives notice that Holder may thereafter effect sales
pursuant to said prospectus.

                                        4
<PAGE>

     2.     Miscellaneous.
            -------------

          2.1     Assignment.  This Agreement shall inure to the benefit of any
                  ----------
subsequent transferee or assignee of the Securities covered by this Agreement.

          2.2     Entire Agreement.  This Agreement constitutes the entire
                  ----------------
agreement between the parties hereto with respect to the subject matter hereof
and supersedes all prior agreements, representations, warranties, statements,
promises and understandings, whether oral or written, with respect to the
subject matter hereof.

          2.3     Governing Law.  All questions concerning the construction,
                  -------------
validity and interpretation of this Agreement will be governed by the laws of
the State of Delaware.

     IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the date first above written.

PATHOGENICS, INC.

By: /s/ Frederic P. Zotos
   --------------------------------
   Frederic P. Zotos, President

HOLDER:

By:  /s/ William K. Mackey
   --------------------------------
   William K. Mackey

                                        5
<PAGE>

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