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. 2021 Feb 2;22(3):1499. doi: 10.3390/ijms22031499

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(A) Regenerated silk fibroin (RSF) was chemically modified with glycidyl methacrylate (GMA) to form (Sil-MA) as a pre-hydrogel. (a) RSF covalently immobilized with GMA, generating a vinyl double bond as a UV-crosslinking site. (b) Schematic diagram of the methacrylation process of SF; LAP represents Lithium phenyl(2,4,6-trimethylbenzoyl) phosphinate which is a photoinitiator. (B) Representative 3D printed models (brain and ear) via a digital light processing (DLP) printer using Sil-MA as a bioink, showing complex structure reflecting their CAD images. Reprinted with permission from [154].