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. 2020 Dec 21;11:601497. doi: 10.3389/fimmu.2020.601497

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Copyright © 2020 Li, Peng, Wu, Quan, Li, Lu and Cui

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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Enhanced retention of nanoparticles. Compared to small-molecule drugs, nanoparticles appear to be gradually enriched in tumors and maintained for a longer period of time.