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Impact of TNF‐α and aspirin on matrix accumulation during chondrogenesis of BMMSCs. (A) Representative microscopic images showing Alcian Blue staining of cartilage pellets cultured under different treatment conditions for 7, 14, and 21 days. (B) Representative microscopic images showing safranin O‐fast green staining of cartilage pellets cultured under different treatment conditions for 7, 14, and 21 days. Scale bars: 250 μm
