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What is Phenylketonuria (PKU)?

An inherited disorder caused by a lack of an enzyme necessary to convert the amino acid, phenylalanine, into another amino acid, tyrosine, so that excesses can be eliminated from the body. A buildup of excess phenylalanine in the blood can lead to neurological disturbances and mental retardation.

The blood of a two week-old infant is collected
for a Phenylketonuria, or PKU, screening.

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