FIG. 2.

Indole production correlates to increased vpsL::lacZ transcription. (A) Measured endogenous indole (open boxes) and β-galactosidase (filled circles) production by strain S9171 (ΔlacZ vpsL::lacZ) over a 24-h period. (B) Comparison of the β-galactosidase production in response to endogenous indole production in strain S9171 and exogenous addition of indole to strain S9149 (ΔlacZ ΔtnaA vpsL::lacZ). Error bars represent 1 standard deviation from the mean of three biological replicates for each strain.