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Structure of alginate molecules and scheme of the alginate lyase reaction. (A) Disaccharide in polyG. (B) Disaccharide in polyM. (C) Disaccharide in polyMG. Left, disaccharide in each polymer; right, products of the alginate lyase reactions. Thick and thin arrows indicate the sites cleaved by alginate lyases and progression of the enzyme reactions, respectively.
