1452
Biochemical studies demonstrate that OBF-1 has no intrinsic DNA-binding activity and recognizes the POU domains of Oct-1 and Oct-2 , but not those of Oct-4 and Oct-6 .
 ( protein: Oct-1, None) , ( protein: OBF-1, None) , ( protein: POU domains, None) , ( protein: Oct-6, None) , ( protein: Oct-4, None) , ( protein: Oct-2, 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-1, None) , ( protein: OBF-1, None) , ( protein: POU domains, None) , ( protein: Oct-6, None) , ( protein: Oct-4, None) , ( protein: Oct-2, None) 