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The working principle of two-photon polymerization (TPP) technology. (a–c) Microneedles produced by TPP. Reproduced with permission from [17,142,143], IOP Publishing, Ltd., 2020, John Wiley & Sons, Inc, 2017, Springer Nature, 2020. The image was created with Adobe Illustrator CC (Version 23.0.1.; Adobe Inc., San Jose, CA, USA, 2019).
