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Structural variation of the ABC transporter operons in ten fully sequenced genomes from C. difficile ribotype 027 isolates. The color code is the same as in Figure 2. Five of the sequenced isolates share the structure of this genomic region with the reference strain R20291 (sequence accession number FN545816). In four isolates, genes CDR20291_0805 and CDR20291_0806 are deleted, and structural variation in this region suggested multiple, independent molecular deletion events.
