Table 1 Neurohypophysial hormones in vertebrates

Vasopressin

Cys-Tyr-Phe-Gln-Asn-Cys-Pro-Arg-Gly (NH₂)

Mammals

[Lys⁸]vasopressin

Cys-Tyr-Phe-Gln-Asn-Cys-Pro-Lys-Gly (NH₂)

Pigs and some marsupials

[Phe²]vasopressin

Cys-Phe-Phe-Gln-Asn-Cys-Pro-Arg-Gly (NH₂)

Some marsupials

Vasotocin

Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Arg-Gly (NH₂)

Non-mammals

Oxytocin homologs

Oxytocin

Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Leu-Gly (NH₂)

Placental mammals, some marsupials, platypus, ratfish (H. colliei), elephant shark

Mesotocin

Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Ile-Gly (NH₂)

Some marsupials, non-mammalian

tetrapods, some lungfishes, coelacanth

[Phe²]mesotocin

Cys-Phe-Ile-Gln-Asn-Cys-Pro-Ile-Gly (NH₂)

Australian lungfish

Isotocin

Cys-Tyr-Ile-Ser-Asn-Cys-Pro-Ile-Gly (NH₂)

Ray-finned fishes, marbled electric ray (T. marmorata)

Glumitocin

Cys-Tyr-Ile-Ser-Asn-Cys-Pro-Gln-Gly (NH₂)

Skates

Valitocin

Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Val-Gly (NH₂)

Sharks (Sq. acanthias)

Aspargtocin

Cys-Tyr-Ile-Asn-Asn-Cys-Pro-Leu-Gly (NH₂)

Sharks (Sq. acanthias)

Asvatocin

Cys-Tyr-Ile-Asn-Asn-Cys-Pro-Val-Gly (NH₂)

Sharks (Sc. canicula; T. scyllium)

Phasitocin

Cys-Tyr-Phe-Asn-Asn-Cys-Pro-Ile-Gly (NH₂)

Sharks (T. scyllium)

Phasvatocin

Cys-Tyr-Phe-Asn-Asn-Cys-Pro-Val-Gly (NH₂)

Sharks (Sc. canicula)