Age and phenylalanine.
D000367:Age Factors; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D010649:Phenylalanine / Q000097:blood*; D010661:Phenylketonurias / Q000097:blood
D010649:Phenylalanine