8432
Transcription of the germ-line IgH genes is controlled by intervening (I) regions upstream of their switch regions.
 ( DNA: germ-line IgH genes, None) , ( DNA: IgH genes, None) , ( DNA: intervening (I) regions, 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: germ-line IgH genes, None) , ( DNA: IgH genes, None) , ( DNA: intervening (I) regions, None) 