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Single-cell GFP fluorescence of E. soli LF7(pPiacH-gfp[AAV]) (A), E. soli LF7 ΔiacR::cat(pPiacH-gfp[AAV]) (B), and E. soli LF7 ΔiacR::cat(piacR-PiacH-gfp[AAV]) (C) as a function of time. Cells were growing on M9 plus 12.5 mM succinate.