2556
Factors binding to site C ( nt 4681 to 4701 ) had a DNA-binding specificity similar to that of factors binding to site B , except for PU.1/Spi-1 .
 ( DNA: site C, None) , ( protein: PU.1/Spi-1, None) , ( DNA: nt 4681 to 4701, None) , ( DNA: site B, 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: site C, None) , ( protein: PU.1/Spi-1, None) , ( DNA: nt 4681 to 4701, None) , ( DNA: site B, None) 