because it is the only system in which antibodies are consistently and predictably present in the serum of normal individuals whose red cells lack the antigens. Several epidemiological studies have reported that the
Abstract
Introduction: The ABO blood group system is unique in immunology and haematology because it is the only system in which antibodies are consistently and predictably present in the serum of normal individuals whose red cells lack the antigens. Several epidemiological studies have reported that the