For quantitative bioluminescent assay for ADP:ATP ratio (apoptosis) in cells and screen for modulators. Key Features: Safe. Non-radioactive assay. Homogeneous and convenient. "Mix-incubate-measure" type assay. No wash and reagent transfer steps are involved. Robust and amenable to HTS: Z factors of 0.5 and above are routinely observed in 96-well and 384-well plates. Can be readily automated on HTS liquid handling systems for processing thousands of samples per day. Method: Luminescence. Samples: Cells etc. Species: All. Procedure: Assay takes 20 min. Kit size: 100 tests.