1450
Recent biochemical and genetic studies indicate that in addition to the octamer-binding proteins Oct-1 and Oct-2 , other B cell components are required for lymphoid-restricted, octamer site-mediated immunoglobulin gene promoter activity .
 ( protein: B cell components, None) , ( protein: octamer-binding proteins, None) , ( DNA: immunoglobulin gene promoter, None) , ( protein: Oct-1, 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: B cell components, None) , ( protein: octamer-binding proteins, None) , ( DNA: immunoglobulin gene promoter, None) , ( protein: Oct-1, None) , ( protein: Oct-2, None) 