14912
Cross competition experiments with an octamer sequence from the Ig heavy chain promoter, the BAT box , and a TA-rich sequence present in the CD21 promoter revealed that all three sequences bound the same nuclear proteins suggesting that the BAT box binding proteins were Oct-1 and Oct-2 .
 ( protein: Oct-2, None) , ( DNA: TA-rich sequence, None) , ( protein: BAT box binding proteins, None) , ( protein: nuclear proteins, None) , ( protein: Oct-1, None) , ( DNA: BAT box, None) , ( DNA: CD21 promoter, 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: Oct-2, None) , ( DNA: TA-rich sequence, None) , ( protein: BAT box binding proteins, None) , ( protein: nuclear proteins, None) , ( protein: Oct-1, None) , ( DNA: BAT box, None) , ( DNA: CD21 promoter, None) 