PMID-sentid	Pub_year	Sent_text		comp_official_name	comp_offsetprotein_name	organism	prot_offset
7969153-3	1994	To further understand the roles of E2F in the cell cycle progression, we have overexpressed exogenous E2F-1 by using a tetracycline-controlled expression system.	Tetracycline	119-131	E2F transcription factor 1 L homeolog	Xenopus laevis	102-107