The<unk>  (also known as Cartwright) is present on the membrane of red blood cells and helps determine a person's blood type. The<unk> s are found on the protein acetylcholinesterase, an enzyme which helps break down acetylcholine. The<unk>  system features two alleles,<unk> (a) and<unk> (b). Antibodies against the<unk>  system can lead to transfusion reactions such as hemolytic anemia.
Yt antigen system
MNS antigen system
Kell antigen system
Ii antigen system
Lewis antigen system
Kidd antigen system
Lutheran antigen system
Colton antigen system