 Most of the disease risk conferred by A*0101 are represented by either A1 serotype risks, or A1-B8 serotype risk (In Europe A1-B8 is almost always composed of A*0101 and B*0801).The other alleles, A*0102 and A*0103, may confer specific risks.For example, A*0102 was found linked to a type of stroke seen frequently in children with sickle cell anemia.