PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 12444763-0 2002 Providing a chemical basis toward understanding the histidine base-on motif of methylcobalamin-dependent methionine synthase: an improved purification of methylcobinamide, plus thermodynamic studies of methylcobinamide binding exogenous imidazole and pyridine bases. pyridine 251-259 5-methyltetrahydrofolate-homocysteine methyltransferase Homo sapiens 105-124