A person is suffering from the disease phenyl | vedclass

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(B) Phenylketonuria $(PKU)$ is an inborn error of metabolism inherited as an autosomal recessive trait. It is caused by a mutation in the gene that co

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Phenylalanine hydroxylase

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(B) Phenylketonuria $(PKU)$ is an inborn error of metabolism inherited as an autosomal recessive trait. It is caused by a mutation in the gene that codes for the liver enzyme $Phenylalanine$ hydroxylase. This enzyme is responsible for converting the amino acid $Phenylalanine$ into $Tyrosine$. Due to the deficiency of this enzyme, $Phenylalanine$ accumulates in the body and is converted into phenylpyruvic acid and other derivatives, which leads to mental retardation and other symptoms.

$A$ person is suffering from the disease phenylketonuria, which is an autosomal recessive disease. Which of these is lacking in the person?

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