Hyperphenylalaninemia is due to defect in the enzyme:
Correct Answer: Phenylalanine hydroxylase:
Description: a. Phenylalanine hydroxylase(Ref: Nelson's 20/e p 636-636)Deficiency of the enzyme phenylalanine hydroxylase or of its cofactor tetrahydrobiopterin (BH4) causes accumulation of phenylalanine in body fluids and in the brain.
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