The experiment is simple. Begin by seeding cells in plates, culturing the cells and then treating them with the desired drug. After 2 to 3 days, add 20ul CellTiter-Blue™ Reagent per 100ul of culture medium to each well, shake briefly, incubate under standard cell culture conditions for 1 to 4 hours. Read the results in a fluorescence reader with an excitation of 530 to 570nm and an emission of 580 to 620nm. Results also can be read in an absorbance reader at 570nm and 600nm. The reaction can be stopped and stabilized with SDS. The plate then can then be stored at ambient temperature for up to 24 hours before reading. Because different cells have different metabolic ratios, you may find it optimal to measure fluorescence at different times