PMID-sentid	Pub_year	Sent_text		comp_official_name	comp_offsetprotein_name	organism	prot_offset
1821803-1	1991	Pneumocystis carinii dihydrofolate reductase (DHFR) expressed in Escherichia coli was purified to homogeneity in a single step using methotrexate-Sepharose affinity chromatography.	Sepharose	146-155	Dihydrofolate reductase	Escherichia coli	21-44	
8920005-2	1996	The DHFR domain was purified to homogeneity by methotrexate-Sepharose chromatography followed by an anion-exchange chromatography step in a mono Q column, and displayed a single 27-kDa band on SDS-PAGE.	Sepharose	60-69	Dihydrofolate reductase	Escherichia coli	4-8	
1821803-1	1991	Pneumocystis carinii dihydrofolate reductase (DHFR) expressed in Escherichia coli was purified to homogeneity in a single step using methotrexate-Sepharose affinity chromatography.	Sepharose	146-155	Dihydrofolate reductase	Escherichia coli	46-50