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| ABO Blood-Group System ABH Blood Group | ABO Factors | Blood Group H Type 1 Antigen | H Blood Group | H Blood Group System | ABH Blood Groups | ABO Blood Group System | ABO Blood-Group Systems | ABO Factor | Blood Group, ABH | Blood Group, H | Blood Groups, ABH | Factor, ABO The major human blood type system which depends on the presence or absence of two antigens A and B. Type O occurs when neither A nor B is present and AB when both are present. A and B are genetic factors that determine the presence of enzymes for the synthesis of certain glycoproteins mainly in the red cell membrane. |