PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 8781445-15 1996 We found that nitrosylcobalamin had diminished ability to serve as a cofactor for the enzyme methionine synthase, and that aquocobalamin could quench NO-mediated inhibition of cell proliferation. nitrosylcobalamin 14-31 5-methyltetrahydrofolate-homocysteine methyltransferase Homo sapiens 93-112