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Comparison of the native recA SOS box (wild type) with a perfectly palindromic SOS box (A + 8) with and without the A −6 mutation. The β-galactosidase activity determined with (grey bars) or without (black bars) exposure to the DNA-damaging agent mitomycin C (0.2 μg/ml) is shown. The graph shows the mean values obtained from duplicate assays of at least three independent inductions, with the error bars indicating standard deviations.
