RecBCD protein, necessary for Escherichia coli dam mutant viability, is directly required for DNA repair. Recombination genes recF+, recN+, recO+, and recQ+ are not essential for dam mutant viability; they are required for recBC sbcBC dam mutant survival. mutH, mutL, or mutS mutations do not suppress subinduction of SOS genes in dam mutants.
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Peterson et al. (1993) studied this question.
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