biovision K123-100 Cell and tissue lysates ? Detection method- Absorbance (400 or 405 nm) ? Species reactivity- Mammalian ? Kit size- Convenient sizes (25, 100, 200, 400 assays) ? Applications- Detect early/middle stages of apoptosis; differentiate apoptosis from necrosis. Caspase-5 Activity Colorimetric Assay Kit: Simple & Convenient Colorimetric Assay to Measure Caspase-5 Activity within 1-2 hrs. Kit Size: 25, 100, 200 and 400 assays. The Caspase-5 Colorimetric Assay Kit provides a simple and convenient means for assaying the activity of caspase-5 and related caspases that recognize the sequence WEHD. The assay is based on spectrophotometric detection of the chromophore p-nitroaniline (pNA) after cleavage from the labeled substrate WEHD-pNA. The pNA light emission can be quantified using a spectrophotometer or a microtiter plate reader at 400- or 405 nm.