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Mean (+S.E.M.) percent of baseline ethanol consumption following naltrexone (0.025 – 0.4 mg/kg) administration in runway – exposed and yoked – control animals during 30 min limited – access self – administration sessions. Naltrexone dose – dependently attenuated ethanol consumption for both groups of animals (p < 0.001), but no between – groups differences in naltrexone-induced reductions were observed.
