title: Letter: New forms of phenylketonuria.
mesh_terms: D002648:Child; D002675:Child, Preschool; D004093:Dihydropteridine Reductase / Q000378:metabolism; D006801:Humans; D007223:Infant; D010661:Phenylketonurias / Q000201:enzymology* / Q000209:etiology
chemical_list: D004093:Dihydropteridine Reductase