title: Differential diagnosis of variant forms of hyperphenylalaninaemia by urinary pterins.
mesh_terms: D000293:Adolescent; D001708:Biopterins / Q000031:analogs & derivatives / Q000652:urine; D002648:Child; D002675:Child, Preschool; D002851:Chromatography, High Pressure Liquid; D003937:Diagnosis, Differential; D004093:Dihydropteridine Reductase / Q000235:genetics; D006801:Humans; D007223:Infant; D019798:Neopterin; D010649:Phenylalanine / Q000097:blood*; D010661:Phenylketonurias; D011622:Pterins / Q000652:urine*
chemical_list: D011622:Pterins; D001708:Biopterins; D010649:Phenylalanine; D019798:Neopterin; D004093:Dihydropteridine Reductase