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Swarming phenotypes of Pseudomonas syringae strains differing in expression of rhlA. Swarming of a WT strain of P. syringae B728a (A), a ΔrhlA mutant (B), and a WT strain harboring plasmid pRHLA2 in which rhlA is expressed constitutively at a high level (C) after 16 h of incubation on 0.4% swarm agar plates. Images are representative of at least five repetitions. Bars, 1 cm.
