Table 1. Primary structures of GnRH-family peptides (a) and two synthetic analogues (b).

(a) GnRH-family peptides
Species	Primary structure
Octopus	pGlu-Asn-Tyr-His-Phe-Ser-Asn-Gly-Trp-His-Pro-Gly-NH2
Mammalian	pGlu-His-Trp-Ser-Tyr-Gly-Leu-Arg-Pro-Gly-NH2
Guinea-pig	pGlu-Tyr-Trp-Ser-Tyr-Gly-Val-Arg-Pro-Gly-NH2
Chicken I	pGlu-His-Trp-Ser-Tyr-Gly-Leu-Gln-Pro-Gly-NH2
Chicken II	pGlu-His-Trp-Ser-His-Gly-Trp-Tyr-Pro-Gly-NH2
Frog	pGlu-His-Trp-Ser-Tyr-Gly-Leu-Trp-Pro-Gly-NH2
Salmon	pGlu-His-Trp-Ser-Tyr-Gly-Trp-Leu-Pro-Gly-NH2
Whitefish	pGlu-His-Trp-Ser-Tyr-Gly-Met-Asn-Pro-Gly-NH2
Sea bream	pGlu-His-Trp-Ser-Tyr-Gly-Leu-Ser-Pro-Gly-NH2
Medaka	pGlu-His-Trp-Ser-Phe-Gly-Leu-Ser-Pro-Gly-NH2
Catfish	pGlu-His-Trp-Ser-His-Gly-Leu-Asn-Pro-Gly-NH2
Herring	pGlu-His-Trp-Ser-His-Gly-Leu-Ser-Pro-Gly-NH2
Dogfish	pGlu-His-Trp-Ser-His-Gly-Trp-Leu-Pro-Gly-NH2
Lamprey I	pGlu-His-Tyr-Ser-Leu-Glu-Trp-Lys-Pro-Gly-NH2
Lamprey III	pGlu-His-Trp-Ser-His-Asp-Trp-Lys-Pro-Gly-NH2
Tunicate I	pGlu-His-Trp-Ser-Asp-Tyr-Phe-Lys-Pro-Gly-NH2
Tunicate II	pGlu-His-Trp-Ser-Leu-Cys-His-Ala-Pro-Gly-NH2
(b) Synthetic analogues
Analogue	Primary structure
Des-NY-oct-GnRH	pGlu-His-Phe-Ser-Asn-Gly-Trp-His-Pro-Gly-NH2
NY-cGnRH-II	pGlu-Asn-Tyr-His-Trp-Ser-Tyr-Gly-Trp-Tyr-Pro-Gly-NH2