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Representative images of Safranin‐O staining. (A) Normal cartilage (horizontal sections of the central portion of menisci) displayed strong orange‐red staining, indicating a completely preserved cartilage. In contrast (B, C, D), AKU menisci (horizontal sections of the central portion of menisci) displayed moderate orange‐red staining, indicating advanced cartilage destruction. Scale bar = 100 μm.
