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