9419
Since the DSE and TRE sites cannot bind CREB/ATF homodimers , we propose a mechanism in which the HIV-1 DSE bind heterodimers composed of both AP-1 and CREB/ATF proteins .
 ( DNA: TRE, None) , ( DNA: DSE, None) , ( DNA: DSE, None) , ( protein: CREB/ATF, None) , ( protein: heterodimers, None) , ( protein: CREB/ATF homodimers, 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: TRE, None) , ( DNA: DSE, None) , ( DNA: DSE, None) , ( protein: CREB/ATF, None) , ( protein: heterodimers, None) , ( protein: CREB/ATF homodimers, None) 