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. 2016 Sep 26;14:70. doi: 10.1186/s12951-016-0222-9

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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. 9 — Intracellular localization of QD-COOH in undifferentiated Caco-2 cells. Confocal images of undifferentiated Caco-2 cells incubated for 3 days with QD-COOH (45 µg cadmium ml⁻¹). Early endosomes (EEA1) are depicted in grey. a Orthogonal views (xy, xz and yz) showing the intersection planes at the position of the yellow cross-hair. b Maximum intensity projection of the same z-stack. QDs (magenta), cell membrane (cyan), and nucleus (yellow)