What is placed between the gene name and the numerical identifier for the allele to differentiate between the gene nomenclature and HLA serologic reactivity
HLA-A is a group of human leukocyte antigens (HLA) that are encoded by the HLA-A locus, which is located at human chromosome 6p21. 3. HLA is a major histocompatibility complex (MHC) antigen-specific to humans.