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Effect of LPLF (1, 5, and 10 mg/kg) or morphine, (10 mg/kg), given orally, on the hot-plate test in mice. The asterisks denote the significance levels in comparison with control groups, *P < 0.05, **P < 0.01, ***P < 0.001. In some cases, the error bars of the mean are hidden within the symbols.
