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In E. coli, Tus binds to 10 closely related sites encoded in the chromosome, although only 6 are likely to be involved in replication termination. Each site is 23 base pairs. The sites are called Ter sites, and are designated TerA, TerB, ..., TerG. These binding sites are asymmetric, such that when a Tus-Ter complex (Tus protein bound to a Ter ...