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. 2018 Jan 29;16:7. doi: 10.1186/s12951-018-0335-4

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. 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.

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Fig. 9 — In vivo upconversion luminescence (UCL) images obtained before and at different time points after intravenous injection of the targeted (i.e., UPG-CD326) (a) and nontargeted (i.e., UPG) (b) micelles. c Comparison of the mean fluorescence intensities (MFI) between targeted and nontargeted groups at the different time points (*p < 0.05, **p < 0.01)