DNA transformation and DNA repair of Mc8013 mutants. (A) DNA transformation efficiency of Mc8013, recX, recJ, recQ, rep, and recA mutants. (B) UV survival rates of Mc8013, recX, recJ, recQ, rep, and recA mutants. (C) Nalidixic acid survival rates of Mc8013, recX, recJ, recQ, rep, and recA mutants. Error bars represent the standard deviations from three independent experiments. *, P < 0.05 by the Student t test relative to parental Mc8013.