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TUNEL staining. Renal apoptosis in the four experimental groups at 6 h post-reperfusion (magnification, ×400). (A) Control group, (B) Ischemic-reperfusion group, (C) Ischemic postconditioning (IPo) group and (D) quercetin + IPo. Arrows indicate TUNEL-positive renal tubular epithelial cells. IPo, ischemic postconditioning; TUNEL, terminal deoxynucleotidyl transferase dUTP nick end labeling.
