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Myocardial histopathological findings. Four-micron-thick sections of myocardial tissue were H&E stained and photographed with a digital camera mounted on a light microscope (×400 magnification; scale bar, 100 μm) at 4 weeks after the coronary artery occlusion surgery. (a) Control group, (b) model group, (c) metoprolol group, and (d) WXKL group.
