Venom component with vasorelaxant activity. In vitro stimulates the production of cGMP in rat aortic smooth muscle cells and histamine release from rat peritoneal mast cells. Induces relaxation of isolated rat uterus. Induces local edema following subplantar injection into rat hind paw. Forms voltage-dependent cation channels which are weakly selective for potassium relative to sodium, and whose conductance decreases with increasing dehydration energy of the monovalent cation. The activity of the fast cation channels is calcium dependent and is characterized by short bursts of current separated by long periods of inactivation. Venom peptide 1 induces slow and continuous calcium influx in IMR-32 human neuroblastoma cells. Venom peptide 4 weakly induces calcium influx in IMR-32 human neuroblastoma cells while venom peptide 2 was not observed to induce calcium influx. Expressed by the venom gland. Stereoinversion of L-Leu-84 (in ovCNP-39a) to D-Leu-84 (in ovCNP-39b). In the C-terminal section; belongs to the natriuretic peptide family.