Causes constriction on isolated rat ileum preparations and relaxation on rat duodenum muscle preparations at amounts higher than bradykinin. Is a partial agonist bradykinin receptor B2 (BDKRB2). Is moderately lethal to honeybees. May be related to the predation of insects by the spider webs. LD(50) is 98 pmoles/mg when injected into honeybees. Dose that causes muscle constriction (ED(50)) is 7 uM. Dose that causes muscle relaxation (ED(50)) is 10 uM. Has been extracted from the spider web. Does not target bradykinin receptor B1 (BDKRB1). Belongs to the bradykinin-related peptide family.