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Phenylketonuria Definition: Phenylketonuria (PKU) is a genetic disorder that is characterized by an inability of the body to utilize the essential amino acid, phenylalanine.henylketonuria Definition: Phenylketonuria (PKU) is a genetic disorder that is characterized by an inability of the body to utilize the essential amino acid, phenylalanine.
Phenylketonuria Phenylketonuria (PKU) is characterized by a person's inability to metabolize the amino acid phenylalanine.If the body can not process part of the protien phenylalanine (phe) then it can cause severe brain damage, skin disorders, behavioral problems, heart defects or even mental retardation.