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Analysis of reduced intracellular thiol levels during logarithmic (log) and stationary (stat) stages of growth. The fold changes in thiol content of sensitive strains (S1 and S2) and clinical Amp B resistant isolates (R1 and R2) during logarithmic vs. stationary stage of growth. Results are expressed as means±SEM of three independent experiments. **, p<0.01; ***, p<0.001; by Student's t-test using GraphPad Prism 5.0.
