Helokinestatin antagonizes the vasodilatory actions of bradykinin at the B2 bradykinin receptor (BDKRB2), with helokinestatin-1 being the most potent antagonist. Natriuretic peptide exhibits vasoactive properties and induces hypotension, possibly by binding to natriuretic peptide receptor NPR1. Expressed by the venom gland. In the C-terminal section; belongs to the natriuretic peptide family.