HLA Complex

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

**Definition:** A family of proteins that are essential for the presentation of peptide antigens on cell surfaces that modulate the host defensive activities of T-cells. This protein family includes major histocompatibility complex (MHC) class I and class II proteins.

**Synonyms:** - HLA - HLA Family - Histocompatibility Antigen - Human Leukocyte Antigen - Human Leukocyte Antigen Complex - Human Leukocyte Antigen Family - MHC - Major Histocompatibility Complex