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Opioid and cannabinoid receptor expressions in different opioid treatment groups. Abbreviations: OGFR = opioid growth factor receptor, OPRM = mu opioid receptor, OPRD = delta opioid receptor, OPRK = kappa opioid receptor, OPRL = lambda opioid receptor, CB1 = cannabinoid receptor 1, CB2 = cannabinoid receptor 2.
