https://doi.org/10.1351/goldbook.13231
Discontinuous genetic variation in the major histocompatibility complex (MHC) that results in the occurrence of several different forms of MHC molecules among people.
Note: Specific HLA polymorphisms are associated with a number of diseases, e.g., HLA-B27 is associated with ankylosing spondylitis, psoriatic arthritis, rheumatoid arthritis (RA), etc., and some chemical sensitivities.