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A. Schematic of single cysteine substitutions introduced into the Cys-less Rv1739c polypeptide. B. Increased 35S-sulfate uptake into cells induced to express Cys-less Rv1739c polypeptide containing the indicated single reintroduced cysteine residues. C. Effects of MTSET and MTSES on sulfate uptake induced in Cys-less Rv1739 and its P54C variant. Number of measurements is indicated within parentheses.
