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Sodium nitrate preconditioning reduces allodynia in diabetic rats. Changes of Von Frey mechanical threshold at 0th, 7th, 30th, and 60th days. Data represent mean ± SEM of 8 rats per group. One-way ANOVA followed by Tukey test was used for multiple comparisons. ***p < 0.001 versus control group; ###p < 0.001 versus D group. Comparisons between the different times in each group were performed by Repeated measures one-way ANOVA and Bonferroni post-test. !p < 0.05 and !!p < 0.01
