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. 2019 Dec 16;9:19148. doi: 10.1038/s41598-019-55453-8

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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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Histograms of the G-quadruplex density in breast cancer. (A) Comparison of low and highly methylated sites in matched normal tissue (left) and primary breast tumor (right) retrieved from TCGA. (B) Comparison of hypermethylated (DMS⁺) and hypomethylated (DMS⁻) sites in TCGA and GEO breast cancer samples (left and right panel, respectively). The curves correspond to normal distributions projected over the histograms.