Exendin-1 (helospectin-1), secreted by the Gila monster venom gland has a VIP/secretin-like biological activity.H-His-Ser-Asp-Ala-Thr-Phe-Thr-Ala-Glu-Tyr-Ser-Lys-Leu-Leu-Ala-Lys-Leu-Ala-Leu-Gln-Lys-Tyr-Leu-Glu-Ser-Ile-Leu-Gly-Ser-Ser-Thr-Ser-Pro-Arg-Pro-Pro-Ser-Ser-OH or H-HSDATFTAEYSKLLAKLALQKYLESILGSSTSPRPPSS-OH