Myocardial cell apoptosis was evaluated by TUNEL method with the In situ Cell Death Detection Kit (Roche, Indianapolis, USA) according to the manufacturer's instructions. After TUNEL staining, myocardial cells were stained with DAPI (Biosharp, China) solution for 20 min at room temperature. The samples were observed under fluorescence microscope (Confocal microscopy Carl Zeiss LSM700).
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