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. 2019 Sep 28;17(10):555. doi: 10.3390/md17100555

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© 2019 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/).

PMC Copyright notice

The printability (A,B) and cell viability (C–E) in collagen hydrogel with the permission of reference [118], Copyright WILEY, 2019. Chemical structures of collagen (F) with the permission of reference [119], Copyright Creative Commons Attribution License (CC BY 3.0).