title: Letter: Variant forms of phenylketonuria.
mesh_terms: D001708:Biopterins / Q000008:administration & dosage / Q000031:analogs & derivatives / Q000627:therapeutic use; D002395:Catecholamines / Q000652:urine; D006719:Homovanillic Acid / Q000134:cerebrospinal fluid; D006801:Humans; D006897:Hydroxyindoleacetic Acid / Q000134:cerebrospinal fluid; D007223:Infant; D007231:Infant, Newborn; D007275:Injections, Intravenous; D010649:Phenylalanine / Q000097:blood; D010661:Phenylketonurias / Q000175:diagnosis* / Q000188:drug therapy / Q000378:metabolism
chemical_list: D002395:Catecholamines; D001708:Biopterins; D010649:Phenylalanine; D006897:Hydroxyindoleacetic Acid; D006719:Homovanillic Acid