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Bacterial motility assays for A. hydrophila strains. Swimming (A and B) and swarming (C and D) motility of A. hydrophila SSU, SSUΔexoA, SSUΔexoA::exoA, NF1 and NF1-exoA were measured in 60-mm Petri plates. Three independent experiments were performed for each strain, and arithmetic means ± SD were plotted.
