FIG 2.

The AcrAB-TolC efflux pump is responsible for SDS resistance in exponential phase. Actively growing (A), carbon-limited (B), or nitrogen-limited (C) cells of the indicated acrA or acrB deletion strains were treated with 2% SDS, and viability was assayed at the indicated time points. Filled data points indicate untreated samples, while open data points indicate SDS-treated samples. *, P < 0.05, for comparisons with initial time point for acrA strain; ‡, P < 0.05, for comparisons with initial time point for acrB strain.