title: The trials and tribulations of Tysabri.
mesh_terms: D000911:Antibodies, Monoclonal / Q000009:adverse effects* / Q000627:therapeutic use*; D061067:Antibodies, Monoclonal, Humanized; D002986:Clinical Trials as Topic; D006801:Humans; D007968:Leukoencephalopathy, Progressive Multifocal / Q000139:chemically induced*; D009103:Multiple Sclerosis / Q000188:drug therapy*; D000069442:Natalizumab; D012307:Risk Factors
chemical_list: D000911:Antibodies, Monoclonal; D061067:Antibodies, Monoclonal, Humanized; D000069442:Natalizumab