Apelin

**Definition:** A 77 amino acid secreted endogenous ligand for the angiotensin II receptor-like 1 protein (APELIN RECEPTOR) that is proteolytically cleaved into four smaller peptides: Apelin-36, Apelin-31, Apelin-28, and Apelin-13. It inhibits entry of HIV into cells that express both APJ and CD4 ANTIGEN and is highly expressed in breast milk, where it may modulate the neonatal immune response.

**Tree numbers:** - D12.644.276.150 - D23.529.134