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. 2018 Sep 15;16:70. doi: 10.1186/s12951-018-0394-6

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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. 4 — Transport of PSNPs with a different surface chemistry by Caco-2 cells. Transport of 4 types of PSNPs in Caco-2 cells exposed to a nominal concentration of 250 µg PSNPs/ml for 24 h. *Significant difference from all and ^#significant difference from 50 nm (-CM) and 200 nm (-CP) PSNPs (P < 0.05)