Effects of physalaemin,a vase-active peptide from amphibian skin,on the excitability of an identifiable molluscan giant neurone ofAchatina fulica Férussac

Summary We examined effects of several vasoactive peptides (substance P, physalaemin, neurotensin, bradykinin, angiotensin etc.) on the excitability of molluscan giant neurones identified in the subesophageal ganglia ofAchatina fulica Férussac. Of these peptides, only physalaemin showed a remarkable excitatory effect on a giant tonically autoactive neurone.