**UNITED STATES
  SECURITIES AND EXCHANGE COMMISSION
  WASHINGTON, D.C. 20549** **SCHEDULE 13G** **UNDER THE SECURITIES EXCHANGE ACT OF 1934
    (Amendment No. )*****CELLADON CORPORATION**
  (Name of Issuer)
  Common Stock, $0.0001 par value per share 
  (Title of Class of Securities)
  15117E 10 7
  (CUSIP Number)
  February 4, 2014
  (Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
  is filed:
  |_| Rule 13d-1(b)
  |X| Rule 13d-1(c)
  |_| Rule 13d-1(d)
  *The remainder of this  cover page shall be filled out for a reporting  person's initial filing on this form with respect to the subject class of  securities, and for any subsequent amendment containing information which would  alter disclosures provided in a prior cover page.
  The information required  on the remainder of this cover page shall not be  deemed to be "filed" for the purpose of Section 18 of the Securities  Exchange  Act of 1934 ("Act") or otherwise subject to the liabilities of that  section of  the Act but shall be subject to all other provisions of the Act (however, see  the Notes).

CUSIP No.
  15117E 10 7
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  1) Names of Reporting  Persons. PFIZER INC.
  I.R.S. Identification Nos. of Above Persons (entities only) 13-5315170
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  2) Check the Appropriate  Box if a Member of a Group (See Instructions)
  (a) |_|
  (b) |_|
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  3) SEC Use Only
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  4) Citizenship or Place  of Organization
  Delaware
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NUMBER OF
        SHARES 
        BENEFICIALLY 
        OWNED BY EACH    REPORTING
        PERSON WITH:
      5. Sole Voting Power      1,794,803 shares of Common Stock; 42,659 shares of Common Stock issuable upon exercise of warrants6. Shared Voting Power    -0-7. Sole Dispositive    Power 1,794,803 shares of Common Stock; 42,659 shares of Common Stock issuable upon exercise of warrants8. Shared Dispositive    Power -0-


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  9) Aggregate Amount  Beneficially Owned by Each Reporting Person 1,794,803 shares of Common Stock; 42,659 shares of Common Stock issuable upon exercise of warrants
  10) Check if the  Aggregate Amount in Row (9) Excludes Certain Shares
  (See Instructions) |_|
  11) Percent of Class  Represented by Amount in Item 9  10.4%
  12) Type of Reporting  Person (See Instructions)   CO
   
  ITEM 1.
  (A) NAME OF ISSUER: Celladon Corporation
  (B) ADDRESS OF ISSUER'S  PRINCIPAL EXECUTIVE OFFICE:
    12760 High Bluff Drive, Suite 240, San Diego, CA 92130
  ITEM 2.
  (A) NAME OF PERSONS  FILING: PFIZER INC.
  (B) ADDRESS OF PRINCIPAL  BUSINESS OFFICE OR IF NONE, RESIDENCE:
  235 E. 42nd Street, New York, NY 10017
  (C) CITIZENSHIP:  DELAWARE, U.S.A.
  (D) TITLE OF CLASS OF  SECURITIES: COMMON STOCK
  (E) CUSIP NUMBER:  15117E 10 7
  ITEM 3. 
  Not applicable. 
  ITEM 4. OWNERSHIP.
  (a) Amount beneficially  owned: 1,794,803 shares of Common Stock; 42,659 shares of Common Stock issuable upon exercise of warrants
  (b) Percent of class: 10.4%
  (c) Number of shares as  to which the person has: 
  (i) Sole power to vote  or to direct the vote:  1,794,803 shares of Common Stock; 42,659 shares of Common Stock issuable upon exercise of warrants
  (ii) Shared power to  vote or to direct the vote: 0
  (iii) Sole power to  dispose or to direct the disposition of:  1,794,803 shares of Common Stock; 42,659 shares of Common Stock issuable upon exercise of warrants
  (iv) Shared power to  dispose or to direct the disposition of:    0

ITEM 5. OWNERSHIP OF  FIVE PERCENT OR LESS OF A CLASS
  Not applicable.
  ITEM 6. OWNERSHIP OF  MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON
  Not applicable.
  ITEM 7.   IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE  SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY
  Not applicable.
  ITEM 8. IDENTIFICATION  AND CLASSIFICATION OF MEMBERS OF THE GROUP
  Not applicable.
  ITEM 9. NOTICE OF  DISSOLUTION OF GROUP
  Not applicable.
  ITEM 10. CERTIFICATION.
  By signing below I  certify that, to the best of my knowledge and belief, the  securities referred to above were not acquired and are not held for the purpose  of or with the effect of changing or influencing the control of the issuer of  the securities and were not acquired and are not held in connection with or as  a  participant in any transaction having that purpose or effect.

**Signature**

After reasonable inquiry and to the best of my knowledge and belief, I certify  that the information set forth in this statement is true, complete and correct.
  Dated: February 14, 2014
  PFIZER INC. 
  By:/s/ Susan Grant
  Name: Susan Grant
  Title: Assistant Secretary