title: PML risk and natalizumab: more questions than answers.
authors.forename: Richard M
authors.initials: RM
authors.lastname: Ransohoff
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000009:adverse effects*; D061067:Antibodies, Monoclonal, Humanized; D006801:Humans; D007968:Leukoencephalopathy, Progressive Multifocal / Q000139:chemically induced* / Q000175:diagnosis / Q000276:immunology; D009103:Multiple Sclerosis / Q000188:drug therapy / Q000276:immunology; D000069442:Natalizumab; D012307:Risk Factors
chemical_list: D000911:Antibodies, Monoclonal; D061067:Antibodies, Monoclonal, Humanized; D000069442:Natalizumab