1914
In contrast, there was little effect of TPA on EGR-1 transcription in a TPA -resistant U-937 cell variant , designated TUR .
 ( cell line: TUR, None) , ( cell line: TPA -resistant U-937 cell variant, None) , ( DNA: EGR-1, 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:
 ( cell line: TUR, None) , ( cell line: TPA -resistant U-937 cell variant, None) , ( DNA: EGR-1, None) 