Fish have multiple GnRH genes that encode structurally distinct peptides. We identified
salmon GnRH (sGnRH), seabream GnRH (sbGnRH), and chicken GnRH-II (cGnRH-II) by cDNA cloning in
cinnamon clownfish (Amphiprion melanopus) using reverse transcription-PCR (RT-PCR) and rapid amplification
of cDNA ends-PCR (RACE-PCR).