PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 15824199-1 2005 BACKGROUND: GTP-cyclohydrolase 1 (GTP-CH1) catalyzes the first step for the de novo production of tetrahydrobiopterin (BH4), a cofactor for nitric oxide synthase (NOS). sapropterin 98-117 nitric oxide synthase 1, neuronal Mus musculus 140-161 15824199-1 2005 BACKGROUND: GTP-cyclohydrolase 1 (GTP-CH1) catalyzes the first step for the de novo production of tetrahydrobiopterin (BH4), a cofactor for nitric oxide synthase (NOS). sapropterin 119-122 nitric oxide synthase 1, neuronal Mus musculus 140-161