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The effect of morphine (6mg/kg) and naloxone (1mg/kg) on analgesic effect of cZnO and nZnO: each bar show the mean ± SEM. + + +P < 0,001show significant difference in compared to saline/morphine 6mg/kg control group, ###P < 0.001 show significant difference in compared to cZnO10/morphine 6mg/kg.
