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Distribution of Rag and Chi elements near dif and in λTSK. The horizontal lines represent 400 kb of the TER region centered on dif. The positions of replication terminators TerC and TerB are indicated. Vertical lines indicate the positions and orientations of Rag (5′-RGNAGGGS-3′) and Chi elements (5′-GCTGGTGG-3′), based on the published sequence of E. coli (7). Chi stimulates RecBCD recombinase activity when the complex arrives at GCTGGTGG from the 3′ end (33).
