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Accumulation of Hoechst 33342 by all 10 strains relative to that by S. Typhimurium SL1344 (control strains) after 10 min (A) and accumulation of ciprofloxacin after 10 min (B). Unfilled bars indicate accumulation without efflux pump inhibitor, and filled bars indicate accumulation in the presence of CCCP. Asterisks indicate values statistically significantly different from the corresponding results for SL1344 (P < 0.05 by t test).
