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(A) Proposed biosynthesis pathways of main core structures adapted from [21] (B) biosynthetic pathways of fucosylated epitopes mediated by FucT2 and FucT3; and (C) overview of H-antigen and Lewis epitopes present in milk of Secretor (Se+), non-Secretor (se−), Lewis positive (Le+) and negative (le−) individuals; (D) proposed biosynthesis of sialylated structures.
