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. 2021 Apr 22;11(5):1083. doi: 10.3390/nano11051083

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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 (https://creativecommons.org/licenses/by/4.0/).

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(A) Pseudocolored SEM images of human osteoblasts that successfully adhered to the surface of scaffolds at an upward trend (Days 1, 3, and 7). Reused with permission from [58]. Copyright © 2021, Elsevier Ltd. (B) Surgical procedure of the preparation of the surgical size defect (5 mm) critical in the rat calvarium (a–c), placement of the chitosan–graphene oxide scaffold (d), and closure of the periosteum and skin (e,f). Reused with permission from [64]. Copyright © 2021, Springer Nature.