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One of the first medical tests a newborn receives determines if the child has phenylketonuria (PKU) .PKU is the result of a mutation in a single gene that causes mental retardation and a host of other phenotypes (light hair and skin color,eczema,and a "mousy" smell) .By detecting PKU early,doctors are able to reduce the effect of this condition with a modified diet.PKU is an example of
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