Kisspeptin was originally identified as a human metastasis suppressor gene that has the ability to suppress melanoma and breast cancer metastasis. Kisspeptin-GPR54 signaling has an important role in initiating secretion of gonadotropin-releasing hormone (GnRH) at puberty from the anterior pituitary. This peptide sequence is found in residues 45 to 54 of Metastin (also referred to as Kisspeptin-10). This peptide increases plasma concentrations of GH (Growth Hormone) and LH (Luteinizing Hormone) in prepubertal dairy heifers. This peptide is the minimal sequence needed to activate GPR54 signaling, which may function in negatively regulating CXCR4’s role in programming tumor metastasis. Specifically, Kisspeptin-10 inhibits signaling and chemotaxis induced by SDF-1.