8025
Although mutation occurs specifically in B cells during the germinal center reaction, it remains a matter of debate whether the mutation machinery also targets non- Ig genes .
 ( DNA: Ig genes, None) , ( cell type: B cells, None) , ( DNA: non- Ig genes, 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 genes, None) , ( cell type: B cells, None) , ( DNA: non- Ig genes, None) 