Group 1 O (I): There are no antigens on the red blood cells and there are antibodies to both antigens α and β, in the plasma.
Group 2 А (II): There are antigens A on the red blood cells, and in the plasma, there are antibodies β to antigens B.
Group 3 B (III): There are antigens B on the red blood cells, and in the plasma, there are antibodies α to antigens A.
Group 4 AB (IV): There are antigens A and B on the red blood cells, but there are no antibodies in the plasma.

There’s also the Rh blood group system that is about the presence or absence of the Rh(D) antigen. It has an influence on the possible body immune system response that appears during a blood transfusion, organ transplantation, or during pregnancy. If this antigen is in the blood, a person is Rh-positive, and if there’s not antigen, a person is Rh-negative.

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