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Figure 5 Staining of tissue sections with the TUNEL. (A) None of the nuclei of normally structured myocytes from control tissue section was stained with TUNEL. (B) A high percentage of the nuclei of myocytes with myolysis showed a weak dUTP staining. (C and D) Examples of strong dUTP staining of nuclei showing morphological alterations. Bar = 20 µm.