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Structures of oligosaccharides: dp8 (A), dp4 (B) and dp2 (C). Residues are labelled 1, 2, 3, 4, 5, 6, 7 and 8 for glucosamine, iduronate, glucosamine, iduronate, glucosamine, iduronate, glucosamine and uronate, as discussed in the text. Note that ring 8 uronate has an un-natural double bond resulting from heparinase digestion.
