This peptide potentiates the effect of bradykinin on the isolated guinea-pig ileum, does not potentiate the effects of bradykinin upon blood pressure and inhibits the angiotensin-converting enzyme (ACE) from rat plasma. Expressed by the venom gland. Exists in two forms, due to cis-trans isomerization at Trp-3-Pro-4. Belongs to the bradykinin-potentiating peptide family.