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Graphic diagram of the modification of the repeating units in the CS/DS chain. Numbers on steps correspond to the reactions catalyzed by enzymes encoded by the following genes (1): CHST11, CHST12, (2): D4ST1, (3): UST, (4): CHST3, CHST7, and (5): CHST15. The figure includes all permutations that are possible to achieve the final product, CS/DS.
