Human blood group systems
Classification systems consisting of a set of blood antigens, chosen for blood typing / From Wikipedia, the free encyclopedia
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For the an overview of the main blood types and their clinical significance, see Blood type.
The term human blood group systems is defined by the International Society of Blood Transfusion (ISBT) as systems 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",[1] and include the common ABO and Rh (Rhesus) antigen systems, as well as many others; 44 human systems are identified as of December 2022[update].[2]