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Pathological changes in knee joint chondrocytes in each group. A, a: healthy control group; B, b: placebo group; C, c: acupotomy group; D, d: drug group; a, b, c, d: enlarged views of the red boxes in A, B, C, and D, respectively. The scale is 100 μm in A, B, C, and D and 20 μm in a, b, c, and d.
