PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 12546077-2 2002 The biological importance of NO was first shown by the findings that nitroglycerin causes vasodilation by liberating NO in the smooth muscle, and activating guanylate cyclase to raise smooth muscle levels of cyclic GMP. Nitroglycerin 69-82 5'-nucleotidase, cytosolic II Homo sapiens 215-218