14896
TPA-GR synergism was determined to have occurred at the GR -responsive element ( GRE ) level by functional analysis of deletion mutants or synthetic GRE oligonucleotides driving chloramphenicol acetyl-transferase expression .
 ( DNA: GRE, None) , ( DNA: GRE, None) , ( DNA: deletion mutants, None) , ( DNA: GR -responsive element, None) , ( DNA: synthetic GRE oligonucleotides, None) , ( protein: GR, None) , ( protein: chloramphenicol acetyl-transferase, 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: GRE, None) , ( DNA: GRE, None) , ( DNA: deletion mutants, None) , ( DNA: GR -responsive element, None) , ( DNA: synthetic GRE oligonucleotides, None) , ( protein: GR, None) , ( protein: chloramphenicol acetyl-transferase, None) 