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Repeating disaccharide structural unit of CS/DS (chondroitin sulfate/dermatan sulfate) isolated from the skin of the fish Sciaena umbra. The structure comprises of repeating units of uronic acid and N-acetyl β-d-galactosamine linked by 4- and 3-linkages, respectively. CS (A) has β-d-glucuronic acid while DS (B) has α-l-iduronic acid residues.
