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Expression of TNF-α, IFN-γ and IL-10 genes in gingival crevicular fluid (GCF) of patients with human gingivitis after 30 days. Bars represent the mean values of samples recovered lines representing the standard error of the mean. The same letter indicates statistical difference P < .05 in T1 comparison with other times (T1 = initial, T2 = 15 days and T3 = 30 days) by the Mann–Whitney tests.
