instaCELL cytotoxicity assay kits have been designed to improve the reliability and reproducibility of routine toxicity testing. The assay kit includes aliquots of cryopreserved assay ready cells which have been qualified for the testing. The cells can be used like a reagent instantly after thawing and don’t need to be cultivated or even counted before. The kit further includes assay plates, proper controls, and a viability dye (Resazurin).