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. 2018 Aug 17;13:240. doi: 10.1186/s11671-018-2661-8

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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.

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Fig. 2 — Characterization of FeNP/CpG particles. a Size distribution spectrum of Fe₃O₄ particles. b Transmission electron microscopic image (TEM) of Fe₃O₄. c Scanning electron microscopy image of Fe₃O₄ particles. d Size distribution of APTES-coated Fe₃O₄ (FeNP) particles. e The TEM image of FeNP particles. f The CpG binding ability of FeNPs determined by gel retardation assay. All data represent three independent experiments