11529
The demonstration that nucleolin is a component of a B cell-specific complex that binds switch region sequences suggests that the G-rich switch regions may have evolved from rDNA .
 ( DNA: switch regions, None) , ( DNA: rDNA, None) , ( protein: B cell-specific complex, None) , ( protein: nucleolin, None) , ( DNA: G-rich switch 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: switch regions, None) , ( DNA: rDNA, None) , ( protein: B cell-specific complex, None) , ( protein: nucleolin, None) , ( DNA: G-rich switch regions, None) 