Sugar-specific PTS activity of S. mutans UA159 and EIIABMan−/EIIFru− strains (JAM11, JAM12, and JAM13) grown in glucose (A) and mannose (B). The glucose-, fructose-, and mannose-specific PTS activities are indicated as GLC, FRU, and MAN, respectively. The values are the means ± SD from at least three individual experiments.