POWER OF ATTORNEY

(For Executing Form ID, Forms 3, 4 and 5 and Schedules 13D and 13G)

Know all by these presents, that the undersigned hereby constitutes and appoints Robin Praeger, signing individually, the undersigned’s true and lawful attorneys-in-fact and agents to:

(i)

prepare, execute in the undersigned ‘s name and on the undersigned’s behalf, and submit to the Securities and Exchange Commission a Form ID, including amendments thereto, and any other documents necessary or appropriate to obtain codes and passwords enabling the undersigned to make electronic filings with the Securities and Exchange Commission of reports required by Section 13(d) and Section 16(a) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or any rules or regulations promulgated thereunder;

(ii)

prepare, execute and file, for and on behalf of the undersigned with respect to holdings of and transactions in securities issued by a company to the undersigned or Versant Venture Capital IV, L.P., Versant Side Fund IV, L.P., Versant Ventures IV, LLC, Versant Venture Capital V, L.P., Versant Affiliates Fund V, L.P., Versant Ophthalmic Affiliates Fund I, L.P., Versant Venture Capital V (Canada) LP, Versant Ventures V, LLC and Versant Ventures V (Canada), L.P., any and all documents and filings that are required or advisable to be made with the United States Securities and Exchange Commission, any stock exchange or similar authority, under the Exchange Act, including without limitation (a) any Joint Filing Agreement under Rule 13d-l(k) of the Exchange Act (or any successor provision thereunder), Schedule 13D and Schedule 13G (or any successor schedules or forms adopted under the Exchange Act) and any amendments thereto in accordance with Section 13 of the Exchange Act and the rules thereunder, and (b) Forms 3, 4 and 5 and any amendments thereto in accordance with Section 16(a) of the Exchange Act and the rules thereunder; and

(iii)

take any other action of any nature whatsoever in connection with the foregoing which, in the opinion of such attorney-in-fact, may be of benefit, 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 such 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. The undersigned acknowledges that the foregoing attorneys-in-fact in serving in such capacity at the request of the undersigned, are not assuming, nor is Versant Ventures assuming, any of the undersigned’s responsibilities to comply with the Exchange Act, including without limitation Sections 13 and 16 of the Exchange Act.

This Power of Attorney shall remain in full force and effect until the earliest to occur of (a) the undersigned is no longer required to file any form or document with respect to the undersigned’s holdings of and transactions in securities issued by a company, (b) revocation by the undersigned in a signed writing delivered to the foregoing attorney-in-fact or (c) as to any attorney-in-fact individually, until such attorney-in-fact shall no longer be employed by Versant Ventures.

I hereby declare that any act or thing lawfully done hereunder by the foregoing attorneys-in-fact shall be binding on the undersigned as if done by myself.

In Witness Whereof, the undersigned has caused this Power of Attorney to be executed as of this 12^th day of September, 2014

	/s/ Thomas Woiwode
	Thomas Woiwode

Versant Venture Capital V, L.P. 3