Urotensin II: a somatostatin-like peptide in the caudal neurosecretory system of fishes. - Pearson,D.; Shively,J.E.; Clark,B.R.; Geschwind,I.I.; Barkley,M.; Nishioka,R.S.; Bern,H.A. (Proc Natl Acad Sci USA, 1980)