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methylmalonic aciduria

[ mĕth′əl-mə-lōnĭk, -lŏnik ]
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n.
A metabolic disorder resulting from an enzyme deficiency and characterized by the presence of excessive amounts of methylmalonic acid in the urine; it can be congenital or acquired because of a vitamin B12 deficiency.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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