title: Complement-fixing ability and specificity of 19S IgM rheumatoid factors in patients with rheumatoid arthritis.
mesh_terms: D000918:Antibody Specificity; D001172:Arthritis, Rheumatoid / Q000276:immunology*; D003168:Complement Fixation Tests; D006801:Humans; D007075:Immunoglobulin M / Q000276:immunology; D012217:Rheumatoid Factor / Q000276:immunology*
chemical_list: D007075:Immunoglobulin M; D012217:Rheumatoid Factor