title: A common antigenic determinant on human C4b and C3b.
mesh_terms: D001323:Autoantibodies / Q000276:immunology; D003179:Complement C3b / Q000276:immunology*; D003181:Complement C4 / Q000276:immunology*; D000939:Epitopes; D006386:Hemagglutination Tests; D006801:Humans; D007074:Immunoglobulin G / Q000276:immunology
chemical_list: D001323:Autoantibodies; D003181:Complement C4; D000939:Epitopes; D007074:Immunoglobulin G; D003179:Complement C3b