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QS induction in the flow cell biofilm reactor. Transmitted light and epifluorescent maximum projections of the confocal scanning laser microscopy stacks are shown for a biofilm grown in the flow cell at 1 ml/min. (A) Transmitted light image and (B) corresponding epifluorescent image showing low lasB expression in the biofilm under flowing conditions. (C) Transmitted light image and (D) corresponding epifluorescent image showing full lasB expression after a 6-h stagnation period.
