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. 2019 May 13;9:7264. doi: 10.1038/s41598-019-43756-9

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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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Extracted ion chromatograms (XICs) of transitions monitored for alkylated endogenous and heavy hepcidin at different spiked-in hepcidin concentrations. The black arrows indicated the location of SRM peak apex based on the retention time of heavy internal standards. Transition legend at bottom left hand of figure defines the blue and purple XIC traces for y18 and y17, respectively.