14724
These results demonstrate that multiple X1 box-specific DNA-binding activities exist in all lymphoid cells , but the presence of an actively binding RFX species correlates with class II transcription .
 ( cell type: lymphoid cells, None) , ( protein: RFX, 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: lymphoid cells, None) , ( protein: RFX, None) 