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This arrangement is called the "replication fork trap."

* See locations and sequences of the replication termini of E. coli.(A) Map showing the ori and the 10 Ter sites. (B) The consensus sequence of Ter.

The Ter sites specifically interact with the replication terminator protein called Tus in E. coli. The Tus-Ter complex impedes the DNA unwinding activity of DnaB in an orientation-dependent manner.

* The crystal structure

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