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AI of S. mutans UA159 wild type and the pgdA-knockout strain during growth. AIs of the wild-type strain are presented as gray bars; those of the pgdA-knockout strain are presented as white bars. OD600 values of the cultures at time points are given in squares for the wild type and triangles for the pgdA knockout. Both AI and OD600 values shown are means of three independent samples with standard deviations.
