A neuropeptide and MRGPRX1 agonist; induces calcium mobilization in HEK293S cells expressing human MRGPRX1 or SNSR3 (EC50s = 14 and 28 nM, respectively); inhibits voltage-induced calcium currents in isolated rat neurons expressing human MRGPRX1 (EC50 = 0.6 µM); intrathecal administration decreases the tail-flick latency in pertussis toxin-stimulated rats and increases the tail-flick latency in U-73122-stimulated rats, indicating changes in pain sensitivity, at 30 nmol/animal; increases scratching behavior in wild-type mice and enhances bile-duct ligation-induced scratching behavior in a mouse model of cholestasis