Fig. 3

The newly regenerated cells formed a niche-like structure on day 4 during the repair process of I/R injury. a Kidney tissues stained with H&E for histological examination by magnification × 200; b Ki67-positive cells in medulla and papilla by immunohistochemistry (magnification × 400); c Ki67-positive cells in medulla and papilla by immunofluorescence (magnification × 400). I/R ischemia/reperfusion, H&E hematoxylin and eosin