Phenylketonuria, abbreviated to PKU, is a disease caused by a common inherited disorder in the way our body processes proteins. The problem lies in an enzyme which converts phenylalanine, an amino acid into another amino acid, tyrosine. The consequence of this is that phenylalanine builds up in the body to high levels. This is a state called hyperphenylalaninaemia, it can be caused by
diseases other than PKU.
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