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Comparison of species compositions between in vitro commensal (control commensal [CC]) and periodontal (control periodontal [CP]) biofilms from 3 independent experiments performed over a period of 3 weeks. Principal-component analysis of commensal biofilms (filled squares) and periodontal biofilms (open squares) grown without exogenously added AHLs was performed. PC1, explaining 27.7% of the variance, separated the commensal and periodontal biofilms (PERMANOVA, F = 6.08, P = 1e−04).
