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. 2022 May 11;12:7702. doi: 10.1038/s41598-022-11796-3

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© The Author(s) 2022

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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(a) DNA damage for irradiated porcine skin using 254 nm and 233 nm light sources with 40 mJ/cm². Untreated skin served as control. The mean values of the epidermal DNA damage in % are calculated from at least three experiments and the error bars show the standard error of the mean. (b)–(e) Histologic images HE and CPD stained porcine skin after irradiation using the far-UVC LED irradiation system without (c) and with filter (d), in comparison, untreated skin (e) and skin after irradiation with near-UVC radiation at 254 nm (f). Arrows mark CPD positive cells. The scale bar is 100 μm.