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In page Phenylketonuria:
"Classical PKU, and its less severe forms "mild PKU" and "mild hyperphenylalaninemia" are caused by a mutated gene for the enzyme phenylalanine hydroxylase (PAH), which converts phenylalanine to tyrosine, which is a conditionally essential amino acid for PKU patients, because without the enzyme PAH, tyrosine cannot be produced in the body through oxidation of Phe.[citation needed]
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