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Glycosaminoglycans comprise linear polysaccharide containing repeated disaccharide units. When one of the disaccharide units of chondroitin sulfate, glucuronic acid, gets epimerized by dermatan epimerase 1 to iduronic acid, dermatan sulfate is formed. Dermatan sulfate is essential in tumorigenesis, due to increased flexibility in the chain and enables interaction with certain proteins such as cyto
