Table 1.

Oxytocin and related peptides

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OxytocinCysTyrIleGlnAsnCysProLeuGly(NH2)Placentals, some marsupials, ratfish (Hydrolagus colliei)
MesotocinIleMarsupials, nonmammalian tetrapods, lungfishes
IsotocinSerIleOsteichthyes
GlumitocinSerGlnSkates (Chondrichthyes)
ValitocinValSharks (Chondrichthyes)
AspargtocinAsnSharks (Chondrichthyes)
AsvatocinAsnValSharks (Chondrichthyes)
PhasvatocinPheAsnValSharks (Chondrichthyes)
CephalotocinPheArgIle Octopus vulgaris (Molluscs)
AnnetocinPheValArgThr Eisenia foetida (Annelids)
VasotocinArgNonmammalian vertebrates, cyclostomes
VasopressinPheArgMammals
LysipressinPheLysPig, some marsupials
PhenypressinPhePheArgMacropodids (Marsupials)
LocupressinLeuThrArg Locusta migratoria (Insects)
Arg-conopressinIleArgArg Conus geographicus (Molluscs)
Lys-conopressinPheArgLys Lymnaea stagnalis (Molluscs)
  • Asterisks indicate amino acid residues that are identical to the corresponding residues in the oxytocin sequence. [Modified from Acher et al. (1).]