In North America and in Europe, one of the most common disorders of amino acid metabolism is Phenylketonuria(PKU), which is caused by a mutation in the gene that encodes for Phenylalanine hydroxylase. Affected individuals are unable to convert Phenylalanine to Tyrosine, and the blood of those with this disease contains very high levels of Phenylalanine and low levels of Tyrosine.
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