5668
This enhancement was eliminated if a conserved 20-bp sequence was removed from the intron or if a dominant-negative ets-binding factor was co-transfected with the reporter gene .
 ( DNA: intron, None) , ( protein: dominant-negative ets-binding factor, None) , ( DNA: reporter gene, None) , ( DNA: conserved 20-bp sequence, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( DNA: intron, None) , ( protein: dominant-negative ets-binding factor, None) , ( DNA: reporter gene, None) , ( DNA: conserved 20-bp sequence, None) 