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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/).
The results of hydrogel microneedles applied to specific biomedical applications. (a) Systemic treatment: HG–MNs can be used for systemic disorders allowing remote control. (b) Local treatment: in another sense, the system can be used in situ, onsite.