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Stationary-phase-induced reversions to his (A), met (B), and leu (C) of the YB955 (●), PERM571 (ΔmutM) (◇), PERM704 (ΔmutY) (□), and PERM573 (ΔmutM ΔmutY) (△) B. subtilis strains were determined as described in Materials and Methods. Data represent counts from six plates averaged from three separate tests normalized to initial cell titers ± SD.
