Arginine vasotocin is present in non-mammalian vertebrates and shares structural and functional properties with mammalian antidiuretic hormone and oxytocin.Through these similarities it has been suggested that arginine vasotocin could be the ancestral precursor to the posterior pituitary hormone in vertebrates.

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Arginine vasotocin shares structural and functional properties with mammalian antidiuretic hormone and oxytocin, and is present in non-mammalian vertebrates, suggesting it could be the ancestral precursor to the posterior pituitary hormone in vertebrates.

Arginine Vasotocin Is Present in Non-Mammalian Vertebrates and Shares Structural