The vasotocin-like biological activity present in the bovine pineal is due to a compound different from vasotocin

Abstract
Summary The vasotocin-like biological activity detected in an extract (E5 fraction) of bovine pineal gland was found not to be due to the presence of vasotocin, vasopressin or oxytocin. The data obtained by means of bio- and radio-immunoassays suggest that the peptide responsible for this biological activity, however, possesses the same Pro-Arg-Gly(NH2) tripeptidic carboxy-terminal end as vasotocin.