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Impact of fumarate on motility of acrD::aph mutant cells compared to SL1344 cells. Areas covered by SL1344 and SL1344 acrD::aph mutant cells for swimming (a) and swarming (b) motility in LB alone and in the presence of increasing concentrations of fumarate are summarized. Data presented are from 13 replicates for LB alone and 4 replicates for fumarate, with mean values indicated. *, P < 0.05; **, P < 0.001.
