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In vitro studies of silk fibroin (SF) and stem cell exosome (Exo)-embedded scaffolds. (A) Scanning electron microscope images of bare SF and Exo-SF scaffold surfaces. (B) Morphology of human bone marrow-derived mesenchymal stem cells cultured on SF and Exo-SF scaffolds for 2 weeks. Reprinted with permission from Kyung Kim, D.; Lee, S.; Kim, M.; Jeong, Y.; Lee, S. (2021). Copyright 2021 Chemical Engineering Journal, Elsevier [98].
