Biogen Idec submits application to FDA for approval of PLEGRIDY™ (peginterferon beta-1a) in multiple sclerosis Biogen Idec, 21 May 2013 Accessed on 31 May 2013 from http://www.biogenidec.com/PRESS_RELEASE_DETAILS.aspx?ID=5981&ReqId=1822494. CommentRecommendBookmarkWatch