The function of AVP (arginine vasopressin, ENSG00000101200) is as follows. Precursor of Arg-vasopressin, an antidiuretic hormone, and neurophysin 2, its carrier protein. . [Arg-vasopressin]: Has a direct antidiuretic action on the kidney, it also causes vasoconstriction of the peripheral vessels. Acts by binding to vasopressin receptors (V1bR/AVPR1B, V1aR/AVPR1A, and V2R/AVPR2). {ECO:0000269|PubMed:18174156, ECO:0000269|PubMed:33664408, ECO:0000269|PubMed:33742150}. [Neurophysin 2]: Carrier protein that binds to and transports Arg-vasopressin from the hypothalamus to the posterior pituitary gland, protecting it from degradation and facilitating its release. .