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. 2007 Aug 10;189(20):7290–7301. doi: 10.1128/JB.00731-07

FIG. 3.

FIG. 3.

Schematic representation of the CDT region and flanking genes. The regions from the nontoxigenic isolate CD37 (A), the binary toxin-negative isolate strain 630 (B), and the binary toxin-positive isolate QCD-32g58 (C) are shown. The positions of the 5′ flanking genes CD2601 and CD2602, the 3′ flanking gene trpS, the response regulator gene cdtR, and the CDT binary toxin-encoding genes cdtAB, or their pseudogenes, are shown. For each variant of the CDT region the positions of the 5′ and 3′ conserved boundaries are shown, and the size of the entire CdtLoc is indicated. The unique 68-bp sequence that is present in CD37 and other nontoxigenic isolates in place of the CdtLoc is shown in bold, and the nucleotide boundaries of the CDT region that are conserved in all three variants are underlined.