FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public
Utility Holding Company Act of 1935 or Section 30(f) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

PFIZER INC 		2. Issuer Name and Ticker or Trading Symbol

ICAGEN INC [ ICGN ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      __ X __ 10% Owner
_____ Officer (give title below)      _____ Other (specify below)
(Last)          (First)          (Middle)

235 E 42ND ST 		3. Date of Earliest Transaction (MM/DD/YYYY)

9/2/2011
(Street)

NEW YORK, NY 10017
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

9/7/2011 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock   9/2/2011     P    4611921   (1) (2) A $6   4611921   I   by Eclipse Acquisition Corp.  
Common Stock                  1067015   (3) D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Explanation of Responses:
( 1)  This filing is being amended to adjust the number of shares of Common Stock (hereinafter defined) acquired as reported in Table I, Box 4 and the number of shares of Common Stock beneficially owned as reported in Table I, Box 5 which were previously reported as 4,617,045. The adjusted amount for each of Box 4 and Box 5 of Table I is 4,611,921.
( 2)  This adjustment results from the failure of certain shareholders to deliver 5,124 shares of Common Stock tendered pursuant to notices of guaranteed delivery, as executed in conjunction with a tender offer by Eclipse Acquisition Corp. ("Purchaser"), a wholly-owned subsidiary of Pfizer Inc. ("Parent"), for all of the issued and outstanding common stock, $0.001 par value per share (the "Common Stock") of Icagen, Inc.
( 3)  Includes 1,067,015 shares previously directly owned by Parent.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
PFIZER INC
235 E 42ND ST
NEW YORK, NY 10017
X


Signatures
/s/ Lawrence A. Fox, Assistant Secretary 9/16/2011
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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