Formalin-fixed and paraffin-embedded tissue sections of liver were deparaffinized in xylene, then gradually rehydrated in decreasing concentrations of ethanol and distilled water. Subsequently, proteinase K permeabilized sections were subjected to incubation with TdT enzyme and fluorochrome mixture (Promega, Madison, WI, USA) for 1 h at 37°C in the dark. After DAPI (Roche, Mannheim, Germany) staining, the slides were analyzed under a fluorescence microscope.
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