12849
BCL-6 mutations in normal germinal center B cells : evidence of somatic hypermutation acting outside Ig loci .
 ( cell type: normal germinal center B cells, None) , ( protein: BCL-6, None) , ( DNA: Ig loci, 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:
 ( cell type: normal germinal center B cells, None) , ( protein: BCL-6, None) , ( DNA: Ig loci, None) 