Enables identical protein binding activity; peptide hormone binding activity; and vasopressin receptor activity. Involved in several processes, including cellular cation homeostasis; hyperosmotic salinity response; and positive regulation of glutamate secretion. Located in several cellular components, including axon terminus; dendrite; and perikaryon. Is integral component of membrane. Used to study anxiety disorder and mental depression. Biomarker of alcohol dependence. [provided by Alliance of Genome Resources, Apr 2022]