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The morphology and surface microstructure of 3D-printed scaffolds. The lower and higher magnification of digital photographs of PCL (A, B), PCL-PDA (C, D), and PCL-PDA-Li scaffolds (E, F). The corresponding SEM images of PCL (G, H), PCL-PDA (I, J), and PCL-PDA-Li (K, L) scaffolds.
