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Swarming motility assay. (A) Wild-type swarming phenotype of 3610 strain compared with swarming-deficient 3610 pnpA strain and complementation in strain overexpressing swrA. (B) Quantitative swarming assay of three strains: 3610, open squares; 3610 pnpA, open circles; 3610 pnpA swrA++, closed circles.
