On the hemagglutinins reacting with M and N red cells treated with proteolytic enzyme.
D000017:ABO Blood-Group System; D000818:Animals; D000917:Antibody Formation; D001789:Blood Group Antigens; D004912:Erythrocytes / Q000187:drug effects / Q000276:immunology*; D006384:Hemagglutination; D007106:Immune Sera; D007114:Immunization; D007518:Isoantibodies / Q000032:analysis*; D011817:Rabbits; D014357:Trypsin / Q000494:pharmacology*
D000017:ABO Blood-Group System; D001789:Blood Group Antigens; D007106:Immune Sera; D007518:Isoantibodies; D014357:Trypsin