<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>poa-varian2013.txt
<DESCRIPTION>EDGAR SUPPORTING DOCUMENT
<TEXT>
POWER OF ATTORNEY
        Know all by these presents, that the undersigned hereby constitutes
 and appoints each of Fred Kurland, Russell Wood and Diane Wilcock, signing
singly, his true and lawful attorneys-in-fact to:
(1)	execute for and on behalf of the undersigned Forms 4 or 5 in
accordance with Section 16 of the Securities Exchange Act of 1934, as
amended and the rules and regulations promulgated thereunder (the "Exchange
Act");
(2)	do and perform any and all acts for and on behalf of the undersigned
 which may be necessary or desirable to complete the execution and delivery
of any such Form 4 or 5 and timely filing of any such form with the United
States Securities and Exchange Commission and any other 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 of, 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 his discretion.
        The undersigned hereby grants to each attorney-in-fact full power
and authority to do and perform all and every act and thing whatsoever
requisite, necessary and proper to be done in the exercise of any of the
rights and powers herein granted, as fully to all intents and purposes as
 such undersigned person 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 his 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.  The undersigned acknowledges that the foregoing
 attorneys-in-fact, in serving in such capacity at the request of the
undersigned, are not assuming any of the undersigned's responsibilities to
comply with Section 16 of the Exchange Act.
        This Power of Attorney shall expire on August 31, 2016.
	IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
 to be executed and it shall be effective as of __May 23_, 2013.
/s/ John Varian
John Varian

</TEXT>
</DOCUMENT>
