Apo-TRACE In Vivo Apoptosis Detection Kit is designed for in vivo apoptotic cell staining and quantitative analysis of Apo-TRACE accumulation. Apo-TRACE uptake into apoptotic cells can be evaluated quantitatively by measuring the level of accumulation of the fluorescent dye within the cells of the organ or tissue. The detection of apoptosis by fluorescent methods depends on the labeling efficiency, which varies among cell/tissue types, cell number, or tissue weight, and the sensitivity of the detection instrument used.