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Apoptosis, or programmed cell death, has been a key topic for many years, particularly in cancer research. In addition to the option of visualising apoptosis-associated proteins, such as caspases, by immunostaining, the TUNEL assay (short for Terminal Deoxynucleotidyl Transferase DUTP Nick End Labelling Assay) in particular offers the possibility of specifically identifying apoptotic cells.