Fig. 4From: Identification of stress-responsive transcription factors with protein-bound Escherichia coli genomic DNA librariesDirectly functional screening of arsenite-responsive clones. Ninety clones from library were randomly selected, cultured with 5 μM arsenite treatment for 2 h, and subject to luciferase analysis (a). Nine clones with luciferase activities > 600 RLU were then selected for arsenite induction assay (b)Back to article page