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. 2016 Jul 19;11:338. doi: 10.1186/s11671-016-1554-y

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© The Author(s). 2016

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 Au NPs before and after functionalized with CpG ODNs. a TEM images of the as-synthesized Au NPs; b size distribution; and c UV-vis spectra of Au NPs and CpG-Au NP nanoconjugates. d The fluorescence spectra of the supernatant before (red line) and after (black line) displacement by mercaptoethanol (MCE) of the fluorescein-tagged, thiolated CpG ODNs