FIG. 5.

Model for integration of CTn86 into the B. fragilis chromosome. (A) Circular intermediate of CTn86 prior to integration. attCTn86 in the right-left junction is enlarged to show the IR sequence at the ends of CTn86 separated by TA. (B) Sequences of the regions of per and ORF-C where CTn86 integrates (B. fragilis aattB). The 7-bp target sites in per and ORF-C are indicated by boxes. There is not any sequence similarity between the ends of CTn86 and the target sites. (C) Sequences of the ends of CTn86 and flanking regions. Integration of CTn86 into the target site resulted in duplication of the target sites (shown in boxes).