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Swarming ability of the S. enterica recAo6869 (recAo) mutant harboring the cheW-overexpressing plasmid pUA1110. Colony swarming patterns developed on a semisolid (Difco) agar surface in the presence of increasing concentrations of IPTG (0, 10, 20, and 30 μM) in cultures incubated for 24 h at 37°C. As a control, the swarming phenotype of the recAo6869 mutant harboring the pUA1108 overexpression vector without the cheW gene in the presence of IPTG is also presented.
