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. 2021 Sep 17;11:18535. doi: 10.1038/s41598-021-98089-3

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© The Author(s) 2021, corrected publication 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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Microbiota composition in tumour and matched normal tissues and skins swabs. (a) Principal component analysis, based on Aitchison distances, of all bacterial species that are present in at least 5% of samples. Paired samples are connected by grey lines. (b) Differentially abundant taxa with an adjusted p-value of less than 0.05. Effect size is defined as the between-group differences divided by the within-group differences.