Fig. 5From: Autologous bone grafts with MSCs or FGF-2 accelerate bone union in large bone defectsHistological analysis in each group at 12 weeks. In histological images, there was abundant callus formation in groups A and B, but any bridging at the fracture gap by the callus was not observed, and the fracture gap was still visible. In contrast, bone union was apparent in group C. Original magnification ×40Back to article page