LGnRH-III, lamprey, an isoform of GnRH isolated from the sea lamprey, is a weak GnRH agonist with antitumor activities[1][2]. GnRH[2]
[1]. Pappa EV, et al. Structure-activity studies of lGnRH-III through rational amino acid substitution and NMR conformational studies. Biopolymers. 2012;98(6):525-34. [2]. Manea M, et al. lGnRH-III -- a promising candidate for anticancer drug development. Protein Pept Lett. 2013 Apr;20(4):439-49.