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. 2013 Feb 5;13:9. doi: 10.1186/1475-2867-13-9

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Copyright ©2013 Litwiniec et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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a-d Cell viability in the population of A549 cells after treatment with etoposide - statistical data from flow cytometric analyses (the annexin V/PI assay). Cells presenting features of a early apoptosis (annexin V+/PI-), b late apoptosis (annexin V-/PI-), c necrosis (annexin V-/PI+) and d viable cells (annexin V-/PI-). Statistically significant differences as compared to the control cells are marked by asterisks (Mann–Whitney U statistics, P<0.05). Columns - median percentage of cells, bars - interquartile range. Results are representative of five independent experiments.