PMID-sentid	Pub_year	Sent_text		comp_official_name	comp_offsetprotein_name	organism	prot_offset
2172990-3	1990	However, following phosphocellulose chromatography and reconstitution, the fractionated nuclear extract directs accurate transcription in vitro, using as a template the promoter/enhancer region from the mouse cytochrome P1-450 gene (Cyp1a1) linked to a "G-free cassette" (which generates a transcript with no guanosine residues).	Guanosine	309-318	cytochrome P450, family 1, subfamily a, polypeptide 1	Mus musculus	233-239