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. 2021 Oct 27;12:748102. doi: 10.3389/fphar.2021.748102

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Copyright © 2021 Liu, Chen, Shi, Zhao and Ma.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Schematic diagram of the nanogel structure. Such a structure can enhance cellular uptake and nuclear delivery of drugs, thereby contributing to the effective circumvention of multidrug resistance in cancer (Chen et al., 2019).