A nonapeptide hormone of the neurohypophysis of subvertebrates, with activities similar to that of vasopressin and oxytocin; chemically identical with human vasopressin except for an isoleucyl residue at position 3; thus [3-isoleucine]vasopressin or [Ile3]vasopressin. [vaso, pressin + oxytocin]
- arginine v. v. with arginyl residue at position 8 (identical with arginine oxytocin). SEE ALSO: arginine vasopressin.

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va·so·to·cin .vā-zə-'tōs-ən n a polypeptide pituitary hormone of most lower vertebrates that is held to have an antidiuretic function

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vaso·to·cin (va″zo-) (vas″o-toґsin) a nonapeptide hormone having some properties similar to those of vasopressin and oxytocin, produced in the supraoptico-neurohypophysial unit of birds, reptiles, amphibians, and fishes. It is found in the pituitary gland and hypothalamus of the human fetus but amounts in humans after birth are minute to indetectable.

Medical dictionary. 2011.

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