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Indole inhibits the EvgS-dependent induction of ydeP-lacZ activity at pH 5.5. β-Galactosidase activity of E. coli MG1655 ΔevgS ydeP-lacZ pBADEvgS was measured following incubation at pH 5.5 or pH 7 with or without ethanol (final concentration 1%) or 1 mM indole dissolved in ethanol.
