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. 2020 Nov 6;10:19257. doi: 10.1038/s41598-020-76243-7

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© The Author(s) 2020

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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PBM effects on Type I collagen fibers deposition. Masson trichrome stain in the control and PBM-treated wounds at experimental times 12 h (a), 3 days (b), and 7-days interval (c). The squared region is depicted in higher magnification (× 200) in the following image. The green arrow ((c), first image) points to an ulcerative region in the control wound. Bar graphs demonstrate the comparison of collagen fibers quantification between the PBM-treated and control wounds. Data are shown as the mean ± SD, n = 5 for each group. N.S. non-significant. Scale bar = 100 µm.