BioIntersect’s SuperSensitiveTM Cell Proliferation Assay uses WST-8, which is more stable and less toxic to the cells compared to other tetrazolium salts like MTT, WST-1 or XTT. Mitochondrial dehydrogenases in the cells, reduces WST-8 and produces water-soluble formazan that directly dissolves in culture media. Number of viable cells are directly proportional to the mitochondrial dehydrogenases activity, and the amount of formazan dye formed, which is measured by absorbance at 450 nm. BioIntersect’s SuperSensitiveTM Cell Proliferation Assay is a colorimetric assay for assessing cell viability, cytotoxity and proliferation. Our kit provides a sensitive, easy-to-do, one-step, non-radioactive and high-throughput method for cell proliferation, cell viability, chemotaxis, cytotoxicity, and apoptosis.