Cell viability and cytotoxicity assays are used for drug
screening and cytotoxicity tests of chemicals. Fig. 1 indicates
various reagents used for cell viability detection. They are
based on various cell functions such as enzyme activity,
cell membrane permeability, cell adherence, ATP production,
co-enzyme production, and nucleotide uptake activity.
Many have established methods such as Colony Formation
method, Crystal Violet method, Tritium-Labeled Thymidine
Uptake method, MTT, and WST methods, which are used
for counting the number of live cells.