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. 2016 Jul 27;14:61. doi: 10.1186/s12951-016-0196-7

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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. 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. 1 — TEM of MWCNTs combined or not with plasmid DNA. TEM of MWCNT pure and combined with plasmid DNA. a MWCNT; b DNA-MWCNT; c c-MWCNT; d DNA- c-MWCNT. Scale bars in a indicate 200 nm; in b, c 1 μm and in d 500 nm