Kisspeptin-54(human) TFA, also known as Metastin(human) TFA, is the natural ligand for the kisspeptin receptor (KISS1, GPR54). It demonstrates high affinity for both rat and human GPR54 receptors with dissociation constants (K i) of 1.81 nM and 1.45 nM, respectively. This compound plays a crucial role in inhibiting tumor metastasis and promoting the secretion of gonadotropins, as evidenced by references [1] [2].