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(A) 3D-bioprinted tracheal structure (biotrachea) obtained with an electrospun chitosan-based nanofiber membrane (CHIM). Figures (B–E) denote the CHIM, 3D-printed PCL frame, biotrachea, and the biotrachea with CHIM, respectively (reprinted from Kim et al., 2021 [337]. Copyright © 2022 Springer Nature under the terms of the Creative Commons Attribution 4.0 International License).
