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CRP binds to a site upstream of tibDB. DNase I footprints of CRP bound to coding and noncoding strands of tibDBp are shown. The CRP binding site, tibDBo, is highlighted by shaded rectangles. Arrowheads indicate CRP-dependent DNase I hypersensitive sites. Numbering is relative to the tibD start codon. GA, Maxam-Gilbert sequence ladders.
