Fig. 4

The results of vascular endothelial growth factor (VEGF) expression and hematoxylin–eosin (H–E) staining at host cartilage and host trabecular bone. VEGF-positive cells and microvascular were often confirmed in the subchondral region connected to the cartilage region (A: upper lane) and in the host trabecular bone region (B: lower lane). Scale bars indicate 200 μm