I only know about Phenylketonuria (PKU) because it is an elementary example of an autosomal recessive disease. Newborns are routinely tested, because those with PKU may develop mental retardation on a normal diet. That’s about all I knew, but this from Wikipedia: If PKU is diagnosed early enough, an affected newborn can grow up with … Continue reading The misery that is Phenylketonuria, no more?