HLAHP, or Major histocompatibility complex, class I, H (pseudogene), is a human gene encoded by HLA-H. It may also be known as: Putative HLA class I histocompatibility antigen, alpha chain H; HLA-12.4; HLA-AR; MHC class I antigen H. The encoded protein has an amino acid length of 362 and a mass of 40.9 kDa. HLAHP is a member of the MHC class I family.