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Relationship between clinical biochemical testing and genotypic severity in MSD. A, For each individual with at least two documented sulfatase activity results, genotype severity score, residual enzyme activity, and glycosaminoglycan (GAG) results are shown. B, There is no significant correlation between residual ARSA activity in blood and age at onset of motor regression (ie, last age at best GMFC‐MLD score before regression)
