title: Biopterin, neopterin and tyrosine responses to combined oral phenylalanine and tetrahydrobiopterin loading tests in two normal children and in a girl with partial biopterin deficiency.
mesh_terms: D000284:Administration, Oral; D001708:Biopterins / Q000031:analogs & derivatives / Q000172:deficiency* / Q000494:pharmacology* / Q000652:urine*; D002648:Child; D005260:Female; D006801:Humans; D019798:Neopterin; D010649:Phenylalanine / Q000494:pharmacology*; D011621:Pteridines / Q000172:deficiency* / Q000494:pharmacology* / Q000652:urine*; D014443:Tyrosine / Q000097:blood*
chemical_list: D011621:Pteridines; D001708:Biopterins; D014443:Tyrosine; D010649:Phenylalanine; D019798:Neopterin; C003402:sapropterin