POWER OF ATTORNEY
KNOW ALL BY THESE PRESENTS, that each person whose signature appears below hereby
constitutes and appoints Robert Liptak with full power to act singly, his true and lawful
attorney-in-fact, with full power of substitution, to: (i) sign any and all instruments,
certificates and documents that may be necessary, desirable or appropriate to be executed on
behalf of himself as an individual or in his capacity as a general partner of any
partnership or limited liability company, pursuant to Section 13 or 16 of the Securities
Exchange Act of 1934, as amended, and any and all regulations promulgated thereunder, (ii)
file the same (including any amendments thereto), with all exhibits thereto, and any other
documents in connection therewith, with the Securities and Exchange Commission, and any
stock exchange or similar authority and (iii) 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,
granting unto said attorney-in-fact full power and authority to do and perform each and
every act and thing necessary, desirable or appropriate.
Each of the undersigned hereby grant to the 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 that such attorney-in-fact
or such attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be done
by virtue of this power of attorney and the rights and powers herein granted.
This power of attorney shall remain in full force and effect until revoked by the
undersigned in a signed writing delivered to the attorney-in-fact.
IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 11th day of April,
2008.
/s/ Nicholas Galakatos
Nicholas Galakatos
/s/ Dennis Henner
Dennis Henner
/s/ Jeffrey Leiden
Jeffrey Leiden
/s/ Nick Simon
Nick Simon
/s/ Michael Steinmetz
Michael Steinmetz
/s/ Kurt Wheeler
Kurt Wheeler
