. 2021 Dec 27;9:100107. doi: 10.1016/j.cpnec.2021.100107

Table 1.

Amino acid sequences in the vasotocin-oxytocin family of peptides.^a

Amino acid position	1	2	3	4	5	6	7	8	9	Expressed in (among others)^a
Vasotocin	Cys-	Tyr-	Ile-	Gln-	Asn-	Cys-	Pro-	Arg-	Gly (NH2)	Non-mammalian vertebrates and fetuses
Vasopressin	Cys-	Tyr-	Phe-	Gln-	Asn-	Cys-	Pro-	Arg-	Gly (NH2)	Mammals
Oxytocin	Cys-	Tyr-	Ile-	Gln-	Asn-	Cys-	Pro-	Leu-	Gly (NH2)	Mammals
Mesotocin	Cys-	Tyr-	Ile-	Gln-	Asn-	Cys-	Pro-	Ile-	Gly (NH2)	Non-eutherian tetrapods & birds
Isotocin	Cys-	Tyr-	Ile-	Ser-	Asn-	Cys-	Pro-	Ile-	Gly (NH2)	Ray-finned fishes

[15].