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The relative abundances of five lower functional gene categories in the healthy sites and sites with periodontal pockets. (a) Alanine/aspartic acid/glutamic acid metabolism, (b) lysine biosynthesis, (c) phenylalanine/tyrosine/tryptophan biosynthesis, (d) nucleotide excision repair, and (e) mismatch repair. The five functional gene categories were significantly different between healthy and periodontitis sites (p < 0.05). Data are shown as the mean ± standard error of the mean.
