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Induction of soxS and tolC by paraquat and ofloxacin. Ofloxacin (1 μg/ml) was added to the growing cultures of MG1655 PsoxS-GFP (A) and MG1655 PtolC-GFP (B) after a 30-min incubation with 0.8 mM PQ. The level of GFP fluorescence indicates the level of promoter activity.
