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. 2019 Jan 16;14:24. doi: 10.1186/s11671-019-2853-x

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© The Author(s). 2019

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.

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Fig. 1 — NBs observed under a light microscope (magnification × 1000) (a) and the fluorescence microscope image of DOX-loaded NBs (b) and TEM image of DOX-loaded NBs (c)