AB blood group
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The AB blood group is displayed in individuals whose red blood cells display both the A and B antigen. This is a rare blood group type, AB negative being the rarest[1].
The ABO gene encodes for the formation of glycosyltransferases that add N-acetylgalactosamine and galactose to the H antigen already present on the red blood cells, to form both A and B antigens[2].
The individual with the AB blood type does not contain any antibodies against A and B antigens. This is so the immune system does not attack the red blood cells[3].