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DSF from Stenotrophomonas maltophilia influences biofilm architecture of Pseudomonas aeruginosa PAO1, which does not produce the signal. Images are of 4-day-old biofilms in flow cells. (A) P. aeruginosa PAO1; (B) S. maltophilia K279a; (C) mixed culture of P. aeruginosa PAO1 and S. maltophilia K279a; (D) mixed culture of P. aeruginosa PAO1 and S. maltophilia K279arpfF (DSF negative). Bars, 20 μm. (Courtesy of Max Dow, National University of Ireland, Cork; reproduced with permission).
