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Schematic representation of the 283-bp intergenic region between levR and levA of L. casei. This sequence contains the transcription start sites (+1, underlined capital letters), the start codons (letters in boldface type), and presumed −10 and −35 promoter regions (arrows) for both the levR gene and the levRABCDX operon as well as a potential cre site (boxed area) which overlaps the transcription start site of the lev operon and the −10 promoter sequence of levR.
