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. 2021 Aug 3;11(5):539–553. doi: 10.1557/s43579-021-00069-1

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© The Author(s), under exclusive licence to The Materials Research Society 2021

This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

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(a) 3D printed human heart replica using collagen-material. Left: fresh print, Right: cross-sectional view.^[90] (b) 3D printing an artificial meniscus.^[91] Reprinted (adapted) with permission from ACS Appl. Polym. Mater. 2019, 1, 8, 2023–2032. Copyright (2019) American Chemical Society (c) Flexible 3D printed urethra tubes.^[92] Reprinted (adapted) with permission from ACS Appl. Bio Mater. 2020, 3, 4, 2007–2016. Copyright (2020) American Chemical Society.