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Box-and-whisker plots showing the total amount of IL-9 in gingival crevicular fluid of moderate (A) and deep pocket sites (B) in subjects with grade B and grade C stage III periodontitis before (pre) and after non-surgical periodontal therapy (post). Horizontal line represents the median with the box representing the 25th and 75th percentiles, and the whiskers denote the 5th and 95th percentiles. ** p < 0.01.
