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. 2021 Sep 3;7:71. doi: 10.1038/s41378-021-00298-3

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 6 — a Microneedles fabricated from Ormocer® by 2PP with an 800 μm height and base diameters ranging from 150 to 300 μm⁷⁴. Reproduced with permission from ref. ⁷⁴. Copyright © 2007 John Wiley & Sons. b A microneedle made from Ormocer® with a 750 μm height and a 200 μm base diameter¹². Reproduced with permission from ref. ¹². Copyright © Elsevier. c Scanning electron micrograph (SEM) of a microneedle array (i) fabricated by 2PP from OrmoComp ® and 1 wt% Ciba® IRGACURE® 2959, including top and side views. SEM of epoxy replica (ii) microneedle array made from EPO-TEK® 353ND replicated from (i) through micromolding, including top and side views¹⁵. Reprinted from ref. ¹⁵ with permission.