Mucopolysaccharidoses are a group of metabolic disorders caused by the absence or malfunctioning of lysosomal enzymes needed to break down molecules called glycosaminoglycans - long chains of sugar carbohydrates in each of our cells that help build bone,cartilage, tendons, corneas, skin and connective tissue. MPS I S, Scheie syndrome, is the mildest form of MPS I.
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