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Auto-agglutination assay. Agglutinates of GFP-expressing Pseudomonas syringae pv. tomato DC3000 treated with 0.5% dimethyl sulfoxide (A), 4-hydroxybenzoic acid (B), and vanillic acid (C) were observed by fluorescence microscopy after 48 h incubation
in hrp-inducing medium. Scale bars = 10 μm.
