ABO blood group system
By Fatima FarooqTHE CLASSIFICATION of human blood is based on the inherited properties of red blood cells (erythrocytes) as determined by the presence or absence of the antigens A and B, which are carried on the surface of the red cells. Persons may thus have type A, type B, type O, or type AB blood. The A, B, and O blood groups were first identified by Austrian immunologist Karl Landsteiner in 1901.ABO is the most important blood group system in human blood transfusion. It is a series of
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