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Characterization of the CM and the bFGF-CM complex. (a) Gross overview of the bFGF-CM complex. (b) Scanning electron microscopy indicated that bFGF-CM had a multiporous structure (bar = 100 μm). (c) Proliferation assays showed that CM did not have a cytotoxic effect on MSCs. (d) Rehydration analysis of the CM. (e) The kinetic profile of bFGF release. (f) The bioactivity analysis of the bFGF released from the bFGF-CM complex (*P < 0.05, **P < 0.01).
