There are many methods to assess the DNA fragmentation caused by apoptosis and also many commercial kits are available. Some new methods do quantification assays for DNA Fragmentation by flow cytometry and fluorescent assays.
Apoptotic DNA fragmentation is often analyzed using agarose gel electrophoresis to demonstrate a "ladder" pattern at ~180-BP intervals. Necrosis, on the other hand, is usually characterized by random DNA fragmentation which forms a "smear" on agarose gels.
Read more about this topic: Apoptotic DNA Fragmentation
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