M40 is an hypothalamic neuropeptide which binds to the G-protein-coupled galanin receptors GALR1, 2, and 3.Human: H-Gly-Trp-Thr-Leu-Asn-Ser-Ala-Gly-Tyr-Leu-Leu-Gly-Pro-Pro-Pro-Ala-Leu-Ala-Leu-Ala-NH2 or H-GWTLNSAGYLLGPPPALALA-NH2