This FLICA® (Fluorescent Labeled Inhibitors of CAspases) kit is designed to detect active caspase enzymes. This in vitro assay employs the fluorescent inhibitor probe FAM-VAD-FMK to label active caspase enzymes in living cells. Samples can be analyzed using fluorescence microscopy, a fluorescence plate reader, or by flow cytometry. Our Green Fluorescent Poly (active) Caspase FAM FLICA® Inhibitor Reagent (FAM-VAD-FMK) can be used as a general reagent to detect apoptosis as it is recognized by many types of activated caspases. The probe measures the intracellular process of apoptosis instead of a side-effect, such as the turnover of phosphatidyl serine, and eliminates the incidence of false positives that often plagues methods like Annexin V and TUNEL staining.