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Comparison AUC (area under the curve) between different groups in the chronic phase of the formalin test. Values are means±SEM (n=12). **P<0.01 and ***P<0.001 compared to saline + saline group; ++P<0.01 compared between OXT + saline and L-arginine + saline group; #P<0.05 compared between OXT + saline and L-NAME + saline group. Statistical analyses were made using the one-way ANOVA followed by the Tukey's test Post hoc
