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1. Recent evidence from studies in mice lacking the opioid receptor-like (ORL-1) receptor and from experiments using antibodies raised against orphanin FQ/nociceptin (OFQ/N) suggest that this peptide may be involved in morphine tolerance. In the present study we sought to investigate if administration of exogenous OFQ/N would modulate the development of(More)
RATIONALE Orphanin FQ/nociceptin (OFQ/N), the endogenous ligand of the opioid receptor-like (ORL-1) receptor, shows similarities to dynorphin A (1-17) in structure and functions. Dynorphin and other kappa opioid receptor agonists have been shown to block cocaine sensitization. OBJECTIVE The present study was designed to examine the ability of OFQ/N to(More)
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