3769
In contrast, neither E(gre) nor EA/S motifs contributed pronouncedly to Akv MLV transcription in NIH 3T3 cells lacking DNA-binding ALF1 or HEB and E2A proteins .
 ( protein: E2A proteins, None) , ( protein: ALF1, None) , ( protein: HEB, None) , ( DNA: E(gre), None) , ( DNA: EA/S, None) , ( DNA: EA/S motifs, None) , ( cell line: NIH 3T3 cells, 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:
 ( protein: E2A proteins, None) , ( protein: ALF1, None) , ( protein: HEB, None) , ( DNA: E(gre), None) , ( DNA: EA/S, None) , ( DNA: EA/S motifs, None) , ( cell line: NIH 3T3 cells, None) 