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Growth yields of the parent strains, eriC or crcB deletion mutants, and complemented strains in S. mutans (A), S. anginosus (B), and S. sanguinis (C) at various NaF concentrations. The y-axis represents the OD550 after incubation for 16 h. Data represent the mean standard deviations of three independent experiments. *, significant differences against the OD550 value of the wild-type strain within the same NaF concentration.
