title: Letter: Complex and polyfunctional antibodies.
mesh_terms: D000918:Antibody Specificity; D001666:Binding Sites, Antibody; D003429:Cross Reactions; D000939:Epitopes; D007106:Immune Sera; D007125:Immunogenetics; D008961:Models, Structural
chemical_list: D000939:Epitopes; D007106:Immune Sera