Epifluorescence microphotographs of the coculture at different growth phases after staining with BacLight. Dead cells stained red, and living cells stained green. (A) At 3.25 h after inoculation, exponential growth phase. (B) At 7.5 h after inoculation, transition into the stationary phase. (C) At 10 h after inoculation, stationary phase. (D) At 23 h after inoculation, stationary phase.