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blood: is classified into 4 blood types or groups according to the presence of type A and type B antigens on the surface of red blood cells. These antigens are also called agglutinogens and pertain to the blood cells' ability to agglutinate, or clump together. Type O blood (containing neither type) is found in 47% of the Caucasian population; type A, 41%; type B, 9%; type AB, 3%. Another form of blood grouping is according to Rh-positive and Rh-negative types, based on the distribution of 6 different Rh antigens.
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