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Mutation rates and growth rates in the presence of stress factors. Mutation rates estimated by the Luria–Delbrück fluctuation test (A) and growth rates obtained in these same assays (B) are shown for the WT (n = 15) and the 20GATC virus (n = 3–6) in the presence of thermal stress (red), 5-FU (green), or under control conditions (black; from Fig. 2). Each dot represents an individual estimate and horizontal bars indicate the mean. See Table 2 for details.
