Litorin, an amphibian bombesin peptide derivative, is found to suppress the nutriment, to stimulate the contraction of smooth muscle, to stimulate gastrin, gastric acid, and pancreatic secretion.
Bombesin is a 14-amino acid peptide originally isolated from the skin of the European fire-bellied toad (Bombina bombina). It has two known homologs in mammals called neuromedin B and gastrin-releasing peptide.