title: Letter: Tetrahydrobiopterin treatment of variant form of phenylketonuria.
mesh_terms: D000284:Administration, Oral; D001708:Biopterins / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000627:therapeutic use; D005260:Female; D006801:Humans; D007223:Infant; D007275:Injections, Intravenous; D010649:Phenylalanine / Q000097:blood; D010661:Phenylketonurias / Q000097:blood / Q000188:drug therapy*; D011621:Pteridines / Q000031:analogs & derivatives*
chemical_list: D011621:Pteridines; D001708:Biopterins; D010649:Phenylalanine