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Reversible inactivation of DRN by lidocaine with effect and non-effect doses of morphine on acquisition of conditioned place preference, (One way ANOVA, Tukey’s: *P = 0.032) comparative with the morphine group and (One way ANOVA, Tukey’s: #P = 0.043) comparative with the mor+lidocaine group. Abbreviation: mor = morphine; sal = saline.
