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FTIR spectra of PCL/gelatin composite electrospun scaffolds with and without crater-like structures. FTIR peaks of (A) PCL/gelatin (100/0, 75/25, 50/50, and 25/75) scaffolds without crater-like structures and (B) with crater-like structures at 2 hours after degradation. (C) The scaffolds without crater-like structures and (D) with crater-like structures at 7 days after degradation.
