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Description
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The kit can detect fragmented DNA in the nucleus during apoptosis. In this modified TUNEL assay kit, biotinylated nucleotide is labeled at the DNA 3´-OH ends using the natural or recombinant terminal deoxynucleotidyl transferase (TdT or rTdT). Then, horseradish peroxidase-labeled streptavidin (streptavidin-HRP) is bound to these biotinylated nucleotides, which are detected using the peroxidase substrate, hydrogen peroxide, and 3,3-diaminobenzidine (DAB), a stable chromogen. Using this procedure, apoptotic nuclei are stained dark brown.
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