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The working principle of liquid crystal display (LCD) and continuous liquid interface production (CLIP). (a) Microneedles produced by LCD. Reproduced with permission from [138], Elsevier, 2021 and (b) CLIP technology. Reproduced with permission from [139], PLOS, 2016. The image was created with Adobe Illustrator CC (Version 23.0.1.; Adobe Inc., San Jose, CA, USA, 2019).
