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Indole represses toxT expression. (A to H) V. cholerae JB58 strains carrying the indicated transcriptional reporters were cultured under AKI conditions for 5 h in the presence or absence of 0.5 mM indole, and the gene expression was quantified. The presented results are means ± the SD for at least three independent experiments. Statistical significance was determined using a t test comparing each mean to the no-indole control (*, P < 0.05). MU, Miller units.
