title: Complement abnormalities in polymyositis.
mesh_terms: D003172:Complement C1; D003176:Complement C3; D003181:Complement C4; D003169:Complement Inactivator Proteins; D003165:Complement System Proteins; D006801:Humans; D008180:Lupus Erythematosus, Systemic / Q000276:immunology; D009220:Myositis / Q000276:immunology*
chemical_list: D003172:Complement C1; D003176:Complement C3; D003181:Complement C4; D003169:Complement Inactivator Proteins; D003165:Complement System Proteins