Sodefrin was first isolated from the abdominal glands of the cloaca of the male red belly new (Cynops pyrrhogaster). It shows a specific female attraction activity. It is the first amphibian pheromone identified and the first peptide pheromone identified in vertebrates.
F.Toyoda et al., Horm. Behav., 44, 346 (2003)S.Kikuyama et al., Science, 267, 1643 (1995)