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Robert B. Noll, PhD; Roshni Kulkarni, MD; Michael L. Netzloff, MD

Arch Neurol. 1986;43(2):157-159.

Abstract
• Three brothers with mannosidosis were assessed both biochemically by levels of enzyme activities and developmentally by serial testing of language and cognitive development. The findings indicated that while the leukocyte enzyme activity of -mannosidase was exceptionally low, only mild intellectual deficits were present that did not progress during a two-year follow-up. These results do not substantiate the expected relationship between the severities of enzyme deficiency and developmental delays. Language and cognitive deficits appeared uniform with no areas of strengths or weaknesses. Deficits in development did not progress during a two-year follow-up.

Author Affiliations
From the Department of Pediatrics and Human Development, Michigan State University, East Lansing.

Footnotes
Accepted for publication June 27, 1985.

Reprint requests to Department of Pediatrics and Human Development, B-240 Life Sciences Bldg, Michigan State University, East Lansing, MI 48824 (Dr Noll).

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