Table 2. Comparison of the primary structures of 26RFa (human, rat, and frog sequences) with those of other RFamide-related peptides (human sequences).

Peptide	Amino acid sequence
Human 26RFa	TSGPLGNLAEELNGYSRKKGGFSFRF-NH2
Rat 26RFa	ASGPLGTLAEELSSYSRRKGGFSFRF-NH2
Frog 26RFa	VGTALGSLAEELNGYNRKKGGFSFRF-NH2
Human RFRP-1	MPHSFANLPLRF-NH2
Human RFRP-2	SAGATANLPLRS-NH2
Human RFRP-3	VPNLPQRF-NH2
Human NPFF	SQAFLFQPQRF-NH2
Human NPAF	AGEGLNSQFWSLAAPQRF-NH2
Human PrRP	TPDINPAWYAGRGIRPVGRF-NH2

Bold letters denote residue identity.