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The xpl gene cluster. Putative promoter regions (−10 and −35 regions) were found upstream of the xplR ORF (bp 156809 to 157548) at positions 156741 to 156761 and of the cyp151C ORF (bp 158328 to 159527 bp) at positions 158272 to 158290. A GntR binding site (*) (TnGTnnnACnA) was found 5 bp upstream of the promoter region for cyp151C. Regions targeted by qPCR are shown by barbell lines about the gene boxes.
