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. 2019 Sep 2;9:12655. doi: 10.1038/s41598-019-49064-6

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© The Author(s) 2019

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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Representative oxygen maps of the area of interest (tumor is in the central part) with corresponding histogram presentation of pO₂ level: A - before, B – 24 h and C – 72 h after illumination. Color bars show the pO₂ scale from 0 (dark blue) to 100 mm Hg (red). Histograms show the distribution of the pO₂ values from the individual pixels, with a distinct shift towards higher oxygenation at 24 h after V-PDT.