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Main types of plasmid segregation systems. The figure shows the genetic organization of the main types of arrangement of plasmid segregation systems, as represented by prototype plasmids P1 (type I), R1 (type II), pBToxis (type III) and R388 (type IV?). Boxes represent genes that encode motor proteins (blue) and DNA-binding adaptor proteins (red). Cis-acting sites are shown as yellow boxes. Dashed curved arrows indicate binding of adaptor proteins to their target sites.
