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(a) Sham group myocardial microvascular endothelial cell (×200). (b) Ischemia-reperfusion group myocardial microvascular endothelial cell (×200). (c) Positive product control group myocardial microvascular endothelial cell (×200). (d) Positive product control group myocardial microvascular endothelial cell (×200)
