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Growth of the B. subtilis wild-type strain and ΔluxS mutant in the presence of various sulfur sources. Growth curves for strain 168 (solid symbols) or BSIP1758 ΔluxS::cat (open symbols) in the presence of 100 μM l-cystine (triangles), 200 μM dl-homocysteine (squares), or 200 μM l-methionine (circles).
