H antigen can refer to one of the various types of antigens having diverse biological functions:
- Also known as substance H, H antigen is a precursor to each of the ABO blood group antigens, apparently present in all people except those with the Bombay Blood phenotype [1] (see hh blood group). The gene responsible for making H antigen is FUT1, located on the 19th chromosome in humans.
- Histocompatibility antigen, a major factor in graft rejection.
- major H antigens (major histocompatibility antigen [2] ) "encode molecules that present foreign peptides to T cells" [3] [ page needed ]
- minor H antigens are polymorphic alloantigens presented on foreign major histocompatibility complex molecules. [3] : 525–526 Includes, e.g. the H-Y antigen. Even when major histocompatibility complex genotype is perfectly matched, can cause slow rejection of a graft. [3] : 525–526
- a bacterial flagellar antigen [4]
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