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. 2022 Jun 16;20:284. doi: 10.1186/s12951-022-01479-6

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 3 — Iron oxide for MRI. a Schematic representation of ND-MMSNs synthesized and targeted to postoperative GBM. b In vivo T2WI of postoperative GBM model before and after intravenous injection of D-MMSNs and ND-MMSNs. (adapted from [75] under Creative Commons CC BY license). c Schematic diagram of the synthesis of Fe₃O₄-Mal and Fe₃O₄-ANG nanoprobe. d MRI of the orthotopic GBM model within 24 h after injection of Fe₃O₄-Mal or Fe₃O₄-ANG NPs. e Tumor signal trends for the orthotopic GBM model after injection of Fe₃O₄-Mal or Fe₃O₄-ANG NPs.

Adapted from [98] under Creative Commons CC BY license