1603
Competition assays revealed that the DR units bound to factors other than the 12-bp insert .
 ( DNA: DR units, None) , ( DNA: 12-bp insert, 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: DR units, None) , ( DNA: 12-bp insert, None) 