PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 16291253-1 2005 The role of tetrahydrobiopterin (BH4) as a cofactor in nitric oxide synthase (NOS) has been the object of intense research in the last few years. sapropterin 12-31 nitric oxide synthase 2 Homo sapiens 55-76 16291253-1 2005 The role of tetrahydrobiopterin (BH4) as a cofactor in nitric oxide synthase (NOS) has been the object of intense research in the last few years. sapropterin 33-36 nitric oxide synthase 2 Homo sapiens 55-76