- Measurements from normal umbilical cord blood of four lysosomal enzymatic activities: alpha-L-iduronidase (Hurler), galactocerebrosidase (globoid cell leukodystrophy), arylsulfatase A (metachromatic leukodystrophy), arylsulfatase B (Maroteaux-Lamy). deGasperi, R., Raghavan, S.S., Sosa, M.G., Kolodny, E.H., Carrier, C., Rubenstein, P., Peters, C., Wagner, J., Kurtzberg, J., Krivit, W. Bone Marrow Transplant. (2000)