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. 2020 Aug 14;412(25):6887–6907. doi: 10.1007/s00216-020-02819-x

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© The Author(s) 2020

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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Fig. 1 — Major HM HMO structures and related glycosyltransferases [9, 33–36] involved in their mammary gland biosynthesis starting from lactose as a precursor. Certain HMOs resemble ABH [37] or Se/Le system–related antigens [38, 39]. 3-Fucosyllactose (3′-FL), 2′-fucosyllactose (2′-FL), 3′-sialyllactose (3′-SL), 6′-sialyllactose (6′-SL), difucosyllactose (DFL), lacto-N-tetraose (LNT); lacto-N-neotetraose (LNnT); tentative blood group B tetrasaccharide (Hex)₃(Fuc)₁; tentative blood group A tetrasaccharide (Hex)₂(HexNAc)₁(Fuc)₁; lacto-N-fucopentaose I (LNFP I); lacto-N-fucopentaose II (LNFP II); lacto-N-fucopentaose III (LNFP III); lacto-N-fucopentaose V (LNFP V), lacto-N-fucopentose VI (LNFP VI = LNnFP V), lacto-N-neodifucohexaose I (LNnDFH I), lacto-N-neodifucohexaose II (LNnDFH II), lacto-N-difucohexaose I (LNDFH I), lacto-N-difucohexaose II (LNDFH II); monosaccharide symbols and structural representations of oligosaccharides were drawn with GlycoWorkbench [40] according to CFG proposals [41]