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General observation. Chondrocytes seeded on the gel film were measured by hematoxylin and eosin staining. A greater number of cell clusters formed by the aggregation of chondrocytes was observed in the nHC group than the other groups. HC, hydroxyapatite/collagen; nHC, nano-HC; calcein-AM/PI, acetoxymethyl/propidium iodide; TGF-β, transforming growth factor-β.
