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(a) The number of gfp transcripts normalized against transcripts from the constitutively expressed rrsA gene (which codes for 16S rRNA) in cells exposed to various concentrations of arsenite. (Temperature: 30 °C; cell density: OD600 = 0.2; medium: M9 supplemented medium; induction time: 4 h. All experiments were conducted in triplicate.) (b) Fluorescence micrographs of the E. coli cells constructed in this study after induction with 0.1 mM arsenite.
