SMOX and infection: A quantitative analysis of these data is presented in Figure 4, which shows the relative fraction of intraphagocytic dnpA::Tn mutant vs. PAO1, with a GFP fluorescence level lower than 103.5 after 24 h of incubation with antibiotics at a concentration corresponding to 50x MIC [this threshold value of fluorescence was selected to correspond to a 32-fold multiplication rate of bacteria (see Supplementary Figure 3), corresponding approximately to the 1.5 log cfu difference observed in the Emax of fluoroquinolones against these two strains in the intracellular infection model].