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a classification system for the antigens of human blood; used in blood transfusion therapy; four groups are A and B and AB and O
a classification system for the antigens of human blood; used in blood transfusion therapy; four groups are A and B and AB and O
a classification system for the antigens of human blood; used in blood transfusion therapy; four groups are A and B and AB and O
a classification system for the antigens of human blood; used in blood transfusion therapy; four groups are A and B and AB and O
a classification system for the antigens of human blood; used in blood transfusion therapy; four groups are A and B and AB and O