Cross-species summary: Each blood group system consists of a set of blood types, each of which corresponds to a particular antigen (usually a glycoprotein) on the surface of red blood cells. The different types within a system are the result of the action of different alleles at a locus that usually encodes an enzyme that catalyses the creation of the feature of the glycoprotein unique to that type, e.g. the presence of a particular sugar at the end of a short chain of sugars.

Species in which this phene is found:
chicken (Gallus gallus)
turkey (Meleagris gallopavo)
pig (Sus scrofa)
aoudad (Ammotragus lervia)
cattle (Bos taurus)
goat (Capra hircus)
(Ovis sp.)
sheep (Ovis aries)