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Pathological and morphological effects of naloxone postconditioning on MIRI rats (HE staining, ×400). (A) Sham group, (B) IR group, (C) Nal M group. Sham group, shamoperated control group; IR, 30 min ischemia prior to 2 h reperfusion; Nal M, medium-dose naloxone group (1.0 mg/kg).
