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. 2017 Sep 12;7:11395. doi: 10.1038/s41598-017-11721-z

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© The Author(s) 2017

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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Organic pigments translocate from skin to lymph nodes. Organic pigments in lysed skin and lymph nodes were identified by means of LDI-ToF-MS. Adjacent skin and lymph tissue specimens (about 5–10 mm) are displayed in cryo-matrix after preparing thin sections for μ-FTIR and μ-XRF analyses. Skin specimens are oriented with its surface on the right side. Identified organic pigments are indicated below each sample. Chemical structures of the organic pigments identified in the samples are displayed on the right.