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A. Cell density-dependent induction of 35S-sulfate transport in E. coli strain BW25113, but not in the cysA deletion strain JD21556. B. Arabinose treatment does not increase 35S-sulfate uptake into JD21556 bacteria expressing Rv1739c in plasmid pBAD33. Number of measurements is indicated within parentheses. *, p < 0.05.
