title: Subtypes of i demonstrated by the use of atypical Ii cell types and inhibition studies.
abstract: Haemagglutination, absorption and elution studies with several anti-i sera and atypical Ii red cell types and Oh cells were carried out and three subtypes of specificity were demonstrated. The fourth i subtype was demonstrated by an inhibition method using human serum and amniotic fluid as a source of i substance.
mesh_terms: D000372:Agglutination Tests; D000653:Amniotic Fluid; D001789:Blood Group Antigens; D002965:Classification; D000939:Epitopes; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D007048:I Blood-Group System; D010641:Phenotype
chemical_list: D001789:Blood Group Antigens; D000939:Epitopes; D007048:I Blood-Group System