Figure 7.

Position of associated mutations on F’lac plasmid. The histogram includes all unselected plasmid mutations found in all revertants analyzed. Individual strains and pools are described below the histogram. Lac⁺ mutations are not included. The position and orientation of all chi sites are indicated above the histogram, where arrow points indicate the 3′ end of the chi site that would initiate replication at a new fork. The two circled chi sites are the closest properly oriented sites flanking the OriT site in the circular plasmid.