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Chemical structure of heparin is shown as an example by two disaccharide units: the left disaccharide unit composed of 2-O-sulfated iduronic acid and 2-N- and 6-O-sulfated glucosamine, and the right disaccharide unit composed of glucuronic acid (with or without 2-O-sulfation) and glucosamine (with or without 2-N-acetylation or sulfation or 6-O-sulfation). Created with Biorender.com.
