The simultaneous presence of anti-I and anti-i in sera.
D000371:Agglutination; D000818:Animals; D000906:Antibodies; D004912:Erythrocytes / Q000276:immunology; D000882:Haplorhini; D015186:Hominidae; D006801:Humans; D007106:Immune Sera; D007519:Isoantigens / Q000032:analysis*; D011323:Primates / Q000276:immunology; D013045:Species Specificity
D000906:Antibodies; D007106:Immune Sera; D007519:Isoantigens