Fig. 5.
The presence of RecJ reduces the frequency of UV-induced mutagenesis. (A) Cultures were UV irradiated at the indicated doses and examined for the number of rifampin (Rif)-resistant colonies that appeared after an overnight incubation. The number of Rif-resistant colonies per 107 surviving cells is plotted. Graphs represent an average of at least three independent experiments ± SEM. (B) Cultures were examined for the number of spontaneous Rif-resistant colonies appearing after an overnight incubation. The number of Rif-resistant colonies that appeared per 107 cells is plotted. Graphs represent an average of 30 independent cultures ± SEM.