Fig. 4From: Endothelial progenitor cells improve the therapeutic effect of mesenchymal stem cell sheets on irradiated bone defect repair in a rat modelSubcutaneous osteogenesis of cell sheets. Representative H&E (×200) and immunohistochemical staining images (×200) of BMP-2, OCN, VEGF and CD31. New bone formation (NB), osteoid (OS), blood vessels (asterisk) are indicated in the images. Black arrows indicate positive staining cells, red arrows indicate positive staining bone matrixBack to article page