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Representative images of macroscopic (A), histological and immunohistochemical observation (B) of chondral defects at 12 weeks postoperatively repaired by microfracture + PRP (Group 1), transplantation of autologous ADSCs + PRP (Group 2), and without any treatment (Group 3). Arrows show the defect. Scale bar = 600 µm (magnification 20×).
