Enables hormone activity. Involved in several processes, including negative regulation of smooth muscle cell proliferation; positive regulation of endothelial cell proliferation; and positive regulation of penile erection. Located in neuronal cell body. Used to study several diseases, including Parkinsonism; brain ischemia; periodontitis; pulmonary hypertension; and uveitis. Biomarker of visual epilepsy. Human ortholog(s) of this gene implicated in pulmonary sarcoidosis. Orthologous to human VIP (vasoactive intestinal peptide). [provided by Alliance of Genome Resources, Apr 2022]