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Expression of lexA and recA genes in the ΔsigG mutant strain. Expression of lexA and recA in the mutant strain was determined by real-time RT-PCR methods. The cDNA was amplified with primers RT-lexA and RT-recA (see Table S1 in the supplemental material), and the CT value was normalized using the sigA value. Open bars, OD of 1; shaded bars, OD of 2.
