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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