title: Letter: A variant of phenylketonuria.
mesh_terms: D002648:Child; D002675:Child, Preschool; D006801:Humans; D009247:NADH, NADPH Oxidoreductases / Q000378:metabolism; D010651:Phenylalanine Hydroxylase / Q000378:metabolism; D010661:Phenylketonurias / Q000145:classification* / Q000188:drug therapy / Q000201:enzymology; D011622:Pterins / Q000378:metabolism / Q000627:therapeutic use; D014443:Tyrosine / Q000378:metabolism
chemical_list: D011622:Pterins; D014443:Tyrosine; D010651:Phenylalanine Hydroxylase; D009247:NADH, NADPH Oxidoreductases