3052
Sequence analysis revealed that PB1 is composed of adjacent binding sites for Ets and AP-1 transcription factors .
 ( DNA: PB1, None) , ( DNA: adjacent binding sites, None) , ( protein: Ets, None) , ( protein: AP-1, None) , ( protein: transcription factors, 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: PB1, None) , ( DNA: adjacent binding sites, None) , ( protein: Ets, None) , ( protein: AP-1, None) , ( protein: transcription factors, None) 