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. 2017 Nov 28;7:16478. doi: 10.1038/s41598-017-16758-8

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Stability of pPBS and pPBS with medium. Concentrations of NO₂ ⁻ and H₂O₂ (right y-axis) and cell cytotoxicity of the three cell lines (left y-axis) as a function of time after treatment, to evaluate the stability of pPBS and of pPBS with medium, for a gap of 15 mm and a gas flow rate of 1 slm (i.e., condition 3 of Table 1). The concentrations and percentages are plotted as the mean of at least three repetitions, and the error bars indicate the standard deviations of the mean.