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What is phenylketonuria? Write two sympt...

What is phenylketonuria? Write two symptoms.

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It is an inborn error of metabolism inherited due to autosomal recessive traits. The affected individual lacks an enzyme that converts the amino acid phenylalanine into tyrosine.
Symptoms : (1) Accumulation of phenyl pyruvic acid and phenylalanine in the brain resulting in mental retardation.
(2) Excretion of phenylalanine through urine.
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