Journal
MEDICAL HYPOTHESES
Volume 57, Issue 3, Pages 389-392Publisher
CHURCHILL LIVINGSTONE
DOI: 10.1054/mehy.2001.1377
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Mental retardation is progressive in Down syndrome: individuals are born with normal intelligence which starts to decline linearly within the first year. This phenomenon can be observed with phenylalanine in patients with phenylketonuria, therefore it is compatible with metabolic intoxication. The toxic compound could be hydrogen sulfide. The amount of the compound is probably increased in Down syndrome by increasing active cystathionine beta synthase. This heuristic hypothesis requires further investigation. (C) 2001 Harcourt Publishers Ltd.
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