Fig. 3.

E. coli Top10 cells expressing ilux imaged for different exposure times. Bioluminescence images of E. coli Top10 cells expressing ilux were taken with the indicated exposure times. A fluorescence (fluo) image excited with a 405-nm laser is shown in gray. For the 600-s image, the color bar represents the number of detected photons per pixel. For the other images, the color map was scaled to the minimum and maximum pixel values. (Scale bar: 2 µm.)