This chimeric peptide is a high affinity galanin receptor antagonist (IC50=0.1 nM in rat hypothalamus membranes and Kd=0.01 nm in rat spinal cord membranes). This peptide is also recognized by neuropeptide Y receptors (IC50=0.25 μM in rat cerebral cortex membranes) and is a Y2 agonist in rat vas deferens.