RT Journal Article SR Electronic T1 Natalizumab (Tysabri) JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology DO 10.3174/ajnr.A2226 A1 D.T. Selewski A1 G.V. Shah A1 B.M. Segal A1 P.A. Rajdev A1 S.K. Mukherji YR 2010 UL http://www.ajnr.org/content/early/2010/08/05/ajnr.A2226.abstract AB