title: Macro- and microdifferences in blood group antigens and antibodies. II. Subgroups of A, an example of graded microdifferences.
mesh_terms: D000017:ABO Blood-Group System / Q000032:analysis*; D000818:Animals; D001666:Binding Sites, Antibody; D002462:Cell Membrane; D000939:Epitopes; D004912:Erythrocytes / Q000276:immunology; D006386:Hemagglutination Tests; D006801:Humans; D007128:Immunoglobulin Fragments; D007518:Isoantibodies / Q000032:analysis*; D037102:Lectins; D002679:Pan troglodytes
chemical_list: D000017:ABO Blood-Group System; D000939:Epitopes; D007128:Immunoglobulin Fragments; D007518:Isoantibodies; D037102:Lectins