13D Filing: RA Capital Management and Biocryst Pharmaceuticals Inc (BCRX)

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SIGNATURES

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

Dated: April 2, 2018

RA CAPITAL MANAGEMENT, LLC
By:

/s/ Rajeev
Shah

Rajeev Shah
Authorized Signatory
PETER KOLCHINSKY

/s/ Peter
Kolchinsky

RA CAPITAL HEALTHCARE FUND, L.P.
By: RA Capital Management, LLC
Its: General Partner
By:

/s/ Rajeev
Shah

Rajeev Shah
Authorized Signatory
8

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