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Dissolution of silk scaffolds in PBS solution within 48 hours (A): (a) F-S, the scaffolds derived from fresh solution, (b) FC-S, the scaffolds derived from fast concentrated solution, (c) SC-S, the scaffolds derived from slow concentrated solution; and the SEM images of silk scaffolds after cultured in PBS for 4 hours: (B) F-S, (C) FC-S, and (D) SC-S.
