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. 2016 Apr 1;33:42. doi: 10.1007/s12032-016-0755-7

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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.

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Fig. 4 — Effect of hypoxia on expression of stem cell markers in MDA-MB-231 cells. a Normoxic control group; b hypoxic group; and c group comparison of percentage of cells expressing CD24⁻CD44⁺ESA⁺: it is significantly higher in the hypoxic group 3.60 ± 0.30 % compared with the normoxic group 1.33 ± 0.21 % (P < 0.01)