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Immunohistochemistry images of collagen II expression of articular cartilage (AC) in tibial plateau from 1‐, 3‐, 5‐, 7‐, 9‐, 11‐, 13‐, 15‐, 16‐ and 17‐month‐old rats. (A–J) Typical immunohistochemistry images of collagen II expression of AC in tibial plateau from 1‐, 3‐, 5‐, 7‐, 9‐, 11‐, 13‐, 15‐, 16‐ and 17‐month‐old rats, respectively. Bars represent a length of 100 μm.
