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Organization of the carAB regulatory region and sequences of relevant promoter regions. (A) Locations of carAB promoters P1 and P2 and the binding sites for IHF (hatched box), CarP (open boxes), and ArgR (filled boxes). (B) Sequences of the carAB P1 and pyrBI promoter regions. The −10 regions (underlined) and the start sites (boldface) are indicated.
