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. 2018 Apr 19;16:42. doi: 10.1186/s12951-018-0367-9

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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. 7 — TEM of cells incubated with probes. a HeLa + PBS; b HeLa + Ag₂S@DP-FA; c HeLa + Ag₂S@DP; d A549 + PBS; e A549 + Ag₂S@DP-FA; f A549 + Ag₂S@DP. Inserts in b, c, e and f were the corresponding local magnification