Fig. (6).pmp23::kan mutation in lytA and lytC mutant R6 strains. The strains were exposed to 0.06 µg/ml of Penicillin G in TH broth. The lysis of each strain was followed by monitoring the optical density at 620 nm. To compare the effect of Penicillin G on the different strains, the relative Penicillin G sensibility is presented as the percent of the initial OD₆₂₀ measured just before penicillin addition. This experiment is representative of four assays.A. lytA backgroundB. lytC background