Oh

thr B

hr C

hr A

thr B

hr C

FIGURE 1.25 The E. coli Chromosome

The circular E. coli chromosome has been divided into 100 map units. Starting with zero at thrABC, the units are numbered clockwise from 0 to 100. Various genes are indicated with numbers corresponding to their position on the map. The replication origin (oriC) and termini (ter) of replication are also indicated. Note that chromosome replication does not start at zero map units—the zero point was an arbitrary designation.

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