Fig. 6From: Restoration of a large osteochondral defect of the knee using a composite of umbilical cord blood-derived mesenchymal stem cells and hyaluronic acid hydrogel: a case report with a 5-year follow-upHistological findings. a Positive safranin – O staining was observed throughout the matrix. Immunostaining showed b weak staining for type I collagen but c diffuse strong positivity for type II collagenBack to article page