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SOX9, COL2, and COL1 protein levels were detected by western blot. (a) hACs alone; (b) hUC-MSCs alone; (c) hUC-MSCs cultured with growth factors; (d) direct coculture (50 : 50) at 14 days; (e) direct coculture (50 : 50) at 21 days; (f) direct coculture (50 : 50) at 28 days.
