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Swarming ability of S. enterica recX and recAo6869 (recAo) recX mutant derivatives. Colony swarming patterns developed on a semisolid (Difco) agar surface following incubation of the cultures for 24 h at 37°C are shown. As a control, the negative swarming phenotype of the S. enterica recA-defective mutant (recAdef) is also presented.
