11522
Nucleolin is one component of the B cell-specific transcription factor and switch region binding protein , LR1 .
 ( protein: B cell-specific transcription factor, None) , ( protein: LR1, None) , ( protein: switch region binding protein, None) , ( protein: Nucleolin, 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:
 ( protein: B cell-specific transcription factor, None) , ( protein: LR1, None) , ( protein: switch region binding protein, None) , ( protein: Nucleolin, None) 