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The myocardial apoptosis (arrows point to TUNEL‐positive nuclei) became aggravated in the irradiated groups at months 3, 6, and 12 compared with the control groups. Scale bar = 50 μm, data are mean with 95% confidence, **P<0.01. Con indicates control; and TUNEL, terminal deoxynucleotidal transferase–mediated biotin–deoxyuridine triphosphate nick‐end labeling.
