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Cytokine levels of (a) IFN‐γ, (b) IL‐4, (c) IL‐17, and (d) IL‐10 in gingival crevicular fluid. ** p < .01 and * p < .05 indicate significant differences between the periodontally healthy (PH) group (n = 22) and the chronic periodontitis (CP) group (n = 35). NS p > .05 indicates that there is no significant difference between the two groups
