Vasodilator protein that inhibits vasoconstriction of isolated rat femoral artery induced by phenylephrine (PubMed:19531497). Since platelet aggregation and vasoconstriction are key hemostatic responses, particularly in small wounds, this protein likely participates in the antihemostatic responses during blood feeding (PubMed:19531497). Blocks L-type calcium channels (Cav1/CACNA1) in left ventricular myocytes isolated from rat hearts (By similarity). Expressed by the salivary gland.