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. 2021 Jun 3;4:674. doi: 10.1038/s42003-021-02199-7

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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 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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Fig. 5 — a Western blot of normal human plasma and purified human serum glycoproteins reveal galactose-3-sulfate modification present on sialylated N-glycans. b Western blot of fetuin and asialofetuin identify the galactose-3-sulfate modification is present on N-glycans. c MALDI-TOF analysis in positive and negative ion mode of PNGaseF released N-glycans. The predominant peak containing the galactose-3-sulfate modification on a triantennary N-glycan enriched in the SAX-eluted fraction (negative mode).