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Comparison of surfactant-induced halos around bacterial colonies grown on hard agar plates visualized in the atomized oil assay (A to D) and swarming motility for the same strains on 0.4% soft agar plates (E to H). The strains are a WT strain of P. syringae (A and E), a ΔsyfA mutant (B and F), a ΔsyfA Psyr_3129 double mutant (C and G), and a ΔsyfA Psyr_3129 double mutant harboring pRHLA2, a plasmid constitutively expressing Psyr_3129 (D and H). Bars, 1 cm (A to D).
