title: [Autoantibodies in the ABO-Ii-system (author's transl)].
abstract: Nine cases of autoantibodies in the ABO-system, found by routine investigations, showed the following specificities by agglutination, absorption, and elution techniques: 5 anti-AI, 2 anti-(not-I)-A, I anti-BI and 1 anti-HI. Neutralization experiments by blood group substances revealed heterogeneity among the 5 anti-AI-cases. This is interpreted by different antibody specificities directed against I-antigen components. The relations between the ABO- and Ii-systems are discussed. The occurrence of these antibodies is attributed to oligosaccharides, which are common to both antigen systems. The etiology remains unknown.
mesh_terms: D000017:ABO Blood-Group System; D000042:Absorption; D000918:Antibody Specificity; D001323:Autoantibodies / Q000032:analysis*; D001789:Blood Group Antigens; D006386:Hemagglutination Tests; D006801:Humans; D007048:I Blood-Group System; D009500:Neutralization Tests
chemical_list: D000017:ABO Blood-Group System; D001323:Autoantibodies; D001789:Blood Group Antigens; D007048:I Blood-Group System
vernacular_title: Autoantikörper im ABO-Ii-System