Figure 10.

Mutation frequency (Lac⁺ reversion) of E. coli CC102 strain and its Δung::kan derivatives harboring plasmid pTrc99c or its derivatives containing EcoUng or BdiUng. Mutation frequency values are represented as mean ± SD from 10 independent colonies (replicates), calculated as the ratio of a number of colonies that appeared on minimal lactose plates compared to minimal glucose plates (per 1 ml culture). In Δung::kan strain, provision of BdiUng did not significantly change the C to T mutation frequency (comparing 3 and 5, P value = 0.21).