13D Filing: Baker Bros. Advisors and Mirati Therapeutics Inc. (MRTX)

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SIGNATURES

After reasonable inquiry and to the best
of my knowledge and belief, each of the undersigned hereby certifies that the information set forth in this statement is true,
complete and correct.

November 20, 2017

BAKER BROS. ADVISORS LP
By: Baker Bros. Advisors (GP) LLC, its general partner
By: /s/ Scott L. Lessing
Name: Scott L. Lessing
Title: President
BAKER BROS. ADVISORS (GP) LLC
By: /s/ Scott L. Lessing
Name: Scott L. Lessing
Title: President
/s/ Julian C. Baker
Julian C. Baker
/s/ Felix J. Baker
Felix J. Baker

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