Fig. 3From: Autoinducer-2 regulates Pseudomonas aeruginosa PAO1 biofilm formation and virulence production in a dose-dependent mannerConfocal laser scanning micrographs of 2-day P. aeruginosa PAO1 biofilms treated under different concentrations of AI-2 (×400). Bacterial viability was determined using L13152 LIVE/DEAD BacLight bacterial viability kit. a No exposure to AI-2; b Exposure to 1nM AI-2; c Exposure to 10nM AI-2. Cells staining red are considered dead while cells staining green are viable cells. The scale bar represents 20 μmBack to article page