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Survival of lactic acid-adapted ΔcadB mutant JH2917 and wild-type Salmonella serovar Typhimurium strain SL1344 during acid shock at an external pH of 3.0 poised with HCl. Cells were adapted at pHo 5.8 for 2 h. □, unadapted wild-type cells; ▪, adapted wild-type cells; ▵, unadapted JH2917 cells; ▴, adapted JH2917 cells. The values are means for two biological replicates. The coefficient of variation was <20%.
