This gene is the major histocompatibility complex, class II, DR beta 3. It plays a central role in the immune system by presenting peptides derived from extracellular proteins.
According to OMIM 612735, HLA-DRB3 is also known as HLA-DR52.
[PMID 22654557] The DRB3 gene has 3 major alleles: DRB3*0101 (DR52a), DRB3*0202 (DR52b), and DRB3*0301 (DR52c) (5, 6), with allele frequencies 0.073, 0.136, and 0.120, respectively.
The SNP variants within this gene are listed on the DRB3 page of UniProt. (Scroll down their page.)