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POWER OF ATTORNEY
Know all by these presents, that the undersigned hereby constitutes and appoints each of Sanj K. Patel
and Marc A Rubenstein, signing singly, as the undersigned's true and lawful attorney-in-fact to:
(1) execute for and on behalf of the undersigned, in the undersigned's capacity as an officer and/or
director of Synageva BioPharma Corp. (the "Company"), Forms 3, 4 and 5 in accordance with Section 16(a)
of the Securities Exchange Act of 1934, as amended (the "Act"), and the rules thereunder;
(2) do and perform any and all acts for and on behalf of the undersigned which may be necessary or
desirable to complete and execute any such Form 3, 4 or 5 and timely file such form with the United States
Securities and Exchange Commission and any stock exchange or similar authority; and
(3) take any other action of any type whatsoever in connection with the foregoing which, in the
opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by,
the undersigned, it being understood that the documents executed by such attorney-in-fact on behalf of
the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and
conditions as such attorney-in-fact may approve in such attorney-in-fact's discretion.
The undersigned hereby grants to each attorney-in-fact full power and authority to do and perform any and
every act and thing whatsoever requisite, necessary or proper to be done in the exercise of any of the
rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could
do if personally present, with full power of substitution or revocation, hereby ratifying and confirming
all the acts such attorney-in-fact shall lawfully do or cause to be done by virtue of this power of
attorney and the rights and powers herein granted. The undersigned acknowledges that each of the
foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, is not
assuming any of the undersigned's responsibilities to comply with Section 16 of the Act.
This Power of Attorney shall remain in full force and effect until the undersigned is no longer required
to file Forms 3, 4 and 5 with respect to the undersigned's holdings of and transactions in securities
issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to each
of the foregoing attorneys-in-fact.
IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 20th day of December, 2011.
By:
/s/ Stephen Davis
Print Name:
Stephen Davis