HLA Class II Histocompatibility Antigen, DR Beta 3 Chain

**Semantic type:** Amino Acid, Peptide, or Protein

**Definition:** HLA class II histocompatibility antigen, DR beta 3 chain (266 aa, ~30 kDa) is encoded by the human HLA-DRB3 gene. This protein is involved in the presentation of antigenic peptides derived from extracellular proteins for recognition by alpha-beta T cell receptor (TCR) expressing T-lymphocytes.

**Synonyms:** - HLA-DRB3 - MHC Class II Antigen DRB3