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. 2021 Oct 11;11:20168. doi: 10.1038/s41598-021-99643-9

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© The Author(s) 2021

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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Collagen distribution across venous disease stages. (a) H&E staining of C2 to C6 venous disease tissues classified under CEAP. (b) MT staining of C2–C6 tissues showing no significant difference in collagen distribution from stage C2–C5, but extended collagen loss at C6. An example of the above knee tissue is also shown. (c) Quantification of absolute collagen area across the different venous stages.