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Neuropeptide nociceptin/orphanin FQ is the endogenous ligand for the opioid-receptor-like receptor 1 (ORL1), mediating essential functions in the central and peripheral nervous systems. The present study was performed to investigate the role of nociceptin and ORL1 receptor in nociception and morphine-induced antinociception in the arcuate nucleus of hypothalamus in rats. Hindpaw withdrawal latencies...