A 1-year-old child with mental retardation has a deficiency of dihydrobiopterin reductase.This enzyme deficiency leads to an increased blood level of:

Name: A 1-year-old child with mental retardation has a deficiency of dihydrobiopterin reductase.This enzyme deficiency leads to an increased blood level of:
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Question

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The phenylalanine hydroxylase reaction requires tetrahydrobiopterin.Without tetrahydrobiopterin this reaction is blocked and phenylalanine accumulates, causing brain damage.

A 1-Year-Old Child with Mental Retardation Has a Deficiency of Dihydrobiopterin