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RecA dependence of the sensitivity of Gc uvrD and mfd mutants to UV irradiation. uvrD (A) and mfd (B) mutants were constructed in the FA1090 1-81-S2 recA6 genetic background, and their survival after exposure to the indicated UV fluences was assessed in the presence (+) or absence (−) of RecA expression as described in Fig. 3. Error bars represent the standard deviation of the mean of six independent experiments.
