Cardiomyocyte apoptosis was evaluated by Terminal deoxynucleotidyl transferase nick-end labeling (TUNEL) positive nuclei colocalized with DAPI staining with the use of in situ cell death detection kit. Percent of the number of TUNEL-positive apoptotic cells divided by the total number of DAPI stained cells (nucleated cells) was determined as the apoptosis index as described in previous studies [14, 45, 46].
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