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Invasion of P. gingivalis following exposure to commensal bacteria. Percentage of P. gingivalis CFUs (absolute values +/− SD above each bar) that invaded OKF6/Tert cells after exposure to S. gordonii (Sg) or S. intermedius (Si). All bacteria were added to OKF6/Tert cells at MOI = 100. Graph represents the average and SD of four independent experiments. * = p < 0.05 compared to control. ** = p < 0.05 compared to control and Sg.
