Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Phenylketonuria ?
    ### Response:
    Phenylketonuria (PKU) is a genetic disorder in which the body can't process part of a protein called phenylalanine (Phe). Phe is in almost all foods. If the Phe level gets too high, it can damage the brain and cause severe intellectual disability. All babies born in U.
    