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Levels of intracellular glutathione in bacterial strains (indicated) were determined in medium (61.6 mM NaCl, Panel A) and low (21.6 mM NaCl, Panel B) sodium conditions. Strains lacking gshB and gltT have significantly reduced glutathione levels in both environments; complementation of the gltT mutant in strain gltT+ restores glutathione levels towards wild-type levels. Error bars show S.D. of assays performed in triplicate.
