A 3-month-old boy is brought to the physician because of facial abnormalities and weakness since birth. Physical examination shows coarse facial features and hypotonia. Urinary excretion of mucopolysaccharides is within the reference range. The concentrations of lysosomal enzymes are increased in serum and decreased in cultured skin fibroblasts. Which of the following molecular markers is most likely decreased in this patient's lysosomal enzymes?
A. N-Acetylglucosamine
B. Fucose
C. Galactosamine
D. Mannose 6-phosphate
E. Sialic acid
A 3-month-old boy is brought to the physician because of facial abnormalities and weakness since birth. Physical examina
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