Flamma® 552 TUNEL assay kit was developed for quantitative analysis of apoptotic cells in the mixed cell populations. The kit employs dUTP conjugated Flamma® 552 dye for labeling of fixed cells or tissues. Flamma® Fluor dyes display excellent fluorescence activity and photostability after conjugated to biomolecules, allowing detection of low-abundance biological structures with great sensitivity. This assay kit is reliable and effective method to detect and quantify a wide levels of apoptotic cells by fluorescence microscopy and flow cytometry. BioActs offers Flamma® 552 TUNEL assay kit for the detection apoptotic cells in frozen and formalin-fixed tissue sections, determination of the sensitivity of malignant cells to drug-induced apoptosis, discrimination of apoptotic and necrotic cells in the cell death environment, etc.