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. 2021 Sep 3;13(17):2989. doi: 10.3390/polym13172989

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© 2021 by the authors.

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/).

PMC Copyright notice

In vivo MR images of a mouse (A) before and (B) after injection of BPs@Au@Fe₃O₄ nanocomposite. Figure adapted with permission from [62], Copyright 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.