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Qrr1 shows different capabilities in regulating multiple targets. Fluorescence from plasmid-encoded V. harveyi AphA-GFP [pYS069; (A)], LuxR-GFP [pYS141; (B)], LuxO-GFP [pYS142; (C)] translational fusions were measured in E. coli MC4100 carrying an empty vector (pRHA109), a vector expressing a rhamnose-inducible qrr1 gene (pYS122) or qrr4 gene (pSTR0227). GFP from three independent cultures was measured for each strain and the means and SEMs are shown.
