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Drop of external pH in S. mutans cell suspensions after induction with 1% glucose. Cells were resuspended in 0.05 M phosphate-citrate buffer, pH 7.0 (A) or pH 5.0 (B). Samples are as follows: S. mutans UA159 (WT), IBSL32, and complemented IBSL32. Controls represent average pH values for all 3 strains without induction. The data are averages with standard deviations of results from three independent experiments.
