12004
By screening a T cell cDNA library , we identified a novel ets transcription factor that binds RBTN-2 .
 ( DNA: cDNA library, None) , ( protein: novel ets transcription factor, None) , ( protein: RBTN-2, 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: cDNA library, None) , ( protein: novel ets transcription factor, None) , ( protein: RBTN-2, None) 