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Collaboration Revenue	3 Months Ended
	Mar. 31, 2015
Collaboration Revenue
Collaboration Revenue	10. Collaboration Revenue In January 2014, the Company announced the initiation of a Phase 1 clinical program in its spinal muscular atrophy collaboration with F. Hoffman-La Roche Ltd and Hoffman-La Roche Inc. (Roche) and the Spinal Muscular Atrophy Foundation which triggered a $7.5 million milestone payment from Roche. The Company considered this milestone event substantive because the applicable criteria of its revenue recognition policy would be satisfied and recorded it as collaboration revenue for the three months ended March 31, 2014.

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Represents the entire disclosure pertaining to collaboration revenue.

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