Biogen Idec to acquire full rights and control of Tysabri from Elan for upfront cash and contingent payments Biogen Idec, 6 Feb 2013 Accessed on 11 Feb 2013 from http://www.biogenidec.com/PRESS_RELEASE_DETAILS.aspx?ID=5981&ReqId=1781970. CommentRecommendBookmarkWatch