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. 2018 Apr 2;9(1):3. doi: 10.1186/s12645-018-0037-5

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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.

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Fig. 3 — Fluorescent images of HepG2 cells stained by AO/PI. a control cells; b treat with 0.1% DMSO for 48 h; and c treated with 150 μg/ml ZnO NPs for 48 h (green: normal cancer cells, yellow: early apoptotic, and red: late apoptotic)