8635
The 3'-CAGGTG E-box could bind USF proteins , the ubiquitous repressor ZEB , or the basic helix-loop-helix proteins E2A and HEB , and we showed that a competition between ZEB and E2A /HEB proteins is involved in the silencer activity .
 ( protein: HEB, None) , ( DNA: 3#$%#-CAGGTG E-box, None) , ( protein: ZEB, None) , ( protein: basic helix-loop-helix proteins, None) , ( protein: ubiquitous repressor, None) , ( protein: E2A /HEB proteins, None) , ( protein: E2A, None) , ( protein: ZEB, None) , ( protein: USF proteins, None) , ( protein: E2A, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: HEB, None) , ( DNA: 3#$%#-CAGGTG E-box, None) , ( protein: ZEB, None) , ( protein: basic helix-loop-helix proteins, None) , ( protein: ubiquitous repressor, None) , ( protein: E2A /HEB proteins, None) , ( protein: E2A, None) , ( protein: ZEB, None) , ( protein: USF proteins, None) , ( protein: E2A, None) 