13D Filing: Casdin Capital and Genmark Diagnostics Inc. (GNMK)

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.

* This reporting person disclaims beneficial
ownership of these reported securities except to the extent of its pecuniary interest therein, and this report shall not be deemed
an admission that any such person is the beneficial owner of these securities for purposes of Section 16 of the U.S. Securities
Exchange Act of 1934, as amended, or for any other purpose.

Attention: Intentional misstatements or omissions of fact constitute
Federal criminal violations (see 18 U.S.C. 1001).