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Characterization of ΔpcsB and ΔstkP gene deletion mutant strains. (A) Antibiotic sensitivity was determined by the disc diffusion method in three independent experiments. The average increase in growth inhibition zone was expressed as a percentage relative to the WT; error bars represent standard deviations. (B) Transmission electron microscopic analyses of gene deletion strains ΔstkP and ΔpcsB KO and TIGR4 WT are shown. Bars, 1 μm.
