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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. 13 — Membrane integrity measurements using CellTox™ Green Assay. Membrane integrity was measured after 3 days exposure of undifferentiated cells to QD-COOH, QD-NH₂ and QD-PEG (45 µg cadmium ml⁻¹). Interference with the assay was tested by addition of QDs to positive control Triton X-100 (positive ctr + QDs) shortly prior fluorescence measurement or by adding Triton X-100 to cells exposed to QDs for 3 days (QD + Triton X-100)