The term<unk>  is defined by the International Society of Blood Transfusion (ISBT) as<unk>  in the human species where cell-surface antigens—in particular, those on blood cells—are "controlled at a single gene locus or by two or more very closely linked homologous genes with little or no observable recombination between them", and include the common ABO and Rh (Rhesus) antigen<unk> , as well as many others; 43 human<unk>  are identified as of June 2021.
Human blood group systems
Rh blood group system
Blood type
Sid blood group system
Junior blood group system
Lan blood group system
Human iron metabolism
Skin flora