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RS1 is a genetic element frequently found adjacent to CTX prophages; it contains some but not all of the genes encoded within CTXφ. Black triangles represent end repeat (ER) sequences. The core region is not drawn to scale. Within the RF of CTXφ, intergenic region-1 (ig-1; composed of ig-1′ and ′ig-1) is a continuous sequence between ctxAB and rstR.
