The MTT Cell Viability Assay utilizes the well-established and widely used MTT reagent to determine mammalian cell viability. The redox potential in active mammalian cells reduces MTT to a strongly pigmented formazan product. After solubilization, the absorbance of the formazan can be measured with a microplate absorbance reader. The MTT Cell Viability Assay is a complete, optimized kit that provides all the reagents necessary for the detection of mammalian cell viability.