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Morquio syndrome is a lysosomal storage disease caused by defects in one of two enzymes involved in the degradation of keratan sulphate.
The clinical picture is of normal intelligence but severe dysostosis.
Mucopolysaccharidosis type IVA (MPS IVA; Morquio A syndrome, OMIM 253000) is an autosomal recessive lysosomal storage disorder (LSD) that was first described by Luis Morquio and James Brailsford in 1929