title: DR2 positivity and response to methotrexate in rheumatoid arthritis.
mesh_terms: D001172:Arthritis, Rheumatoid / Q000188:drug therapy*; D015802:HLA-DR2 Antigen; D000949:Histocompatibility Antigens Class II / Q000032:analysis*; D006801:Humans; D008727:Methotrexate / Q000627:therapeutic use*
chemical_list: D015802:HLA-DR2 Antigen; D000949:Histocompatibility Antigens Class II; D008727:Methotrexate