8707
We show that the molecular mechanism (s) underlying Ig gene extinction can be explained, at least in part, by a lack of transcription factors that are essential for Ig gene transcription .
 ( DNA: Ig gene, None) , ( DNA: Ig gene, 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: Ig gene, None) , ( DNA: Ig gene, None) , ( protein: transcription factors, None) 