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Lewis Antigens Terminal oligosaccharide structures used to classify particular antigens based on the presence of an alpha 1-4 linked fucose (Lewis A, B) or an alpha 1-3 linked fucose (Lewis X, Y) to the GlcNAc monosaccharide. Additionally, sialylated forms of Lewis A and Lewis X structures are also shown, in addition to other common O-glycan structures in breast cancer such as Tn-antigen, sialyl-Tn antigen, Thomsen-Friedenreich antigen and sialyl-T antigen.
