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Effect of microinfusion with naltrexone (0, 5, 25 µg/side) in NAcc shell on (A) food self-administration (n=18) and (B) breakpoint on a progressive ratio schedule of reinforcement (n=17) in male Wistar rats. Panel represents M±SEM. Symbols denote: * significant difference from vehicle condition p<0.05, ** p<0.01 (Student Newman–Keuls test).
