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FRET response of WT and mutant Salmonella LT2 strains to cystine and cysteine. Strains used were: WT (TSS500), Δ(cheR cheB) (TSS507), ΔcheV (TSS515). 100 μM cystine or cysteine steps were used in all panels except for Δ(cheR cheB) (right), where the cysteine step size was 100 mM. Up / down arrows indicate the time of addition / removal of chemoeffectors, respectively.
