In vitro competition in human urine complemented with LB. A. Re-competition of uvrY mutants in LB. Three AKP168 individual mutant clones were isolated at day seven from the urine competitions (U1, U2 & U3) and competed against wild type DS17 in LB. Samples were taken at the indicated time points to determine the percentage of AKP168 mutant. B. The same experiment as in Figure 2B but the urine was complemented with LB (see Materials & Methods).