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Swarming ability of the S. enterica wild-type (wt) and recAo6869 (recAo) mutant strains in the presence of an SOS inductor. Colony swarming patterns developed on a semisolid agar surface (Difco) in the presence of increasing concentrations of mitomycin C (0, 8, 80, 200, 800, and 1,600 ng ml−1) are shown.
