Description
Exendin 3 (9-39) is a gastrointestinal motility modulating peptide fragment of exendin-3. This peptide acts as an antagonist at glucagon-like peptide 1 (GLP-1) receptors, increasing spontaneous contractions in colon circular muscle. This peptide inhibits the effects of exendin-4 and other GLP-1 agonists. Exendin-3 was originally found in Heloderma lizards.