CAMBRIDGE, Mass.--(BUSINESS WIRE)--Biogen Idec (NASDAQ: BIIB) today announced that 25 company-sponsored platform and poster presentations will take place during the 61st Annual Meeting of the American Academy of Neurology (AAN) in Seattle, WA, April 25 through May 2, 2009. These presentations, which are not late-breaking abstracts, will cover five compounds that are marketed or currently in development by Biogen Idec and its partners for the treatment of multiple sclerosis (MS). This includes two approved therapies for MS; TYSABRI® (natalizumab) and AVONEX® (Interferon beta-1a); and additional compounds in development including BG-12 (dimethyl fumarate), PEGylated interferon beta-1a, and daclizumab.