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The enzymes are indicated by arrow boxes. Abbreviations: GalNAc, N-acetylgalactosamine; Neu5Ac, N-acetylneuraminic acid; Gal, galactose; Glc, glucose; Hep, heptose; P/PEtn, phosphate or pyrophosphoethanolamine; Kdo, 2-keto-3-deoxy-d-manno-octulosonic acid.
