1449
OBF-1 , a novel B cell-specific coactivator that stimulates immunoglobulin promoter activity through association with octamer-binding proteins .
 ( protein: novel B cell-specific coactivator, None) , ( protein: OBF-1, None) , ( DNA: immunoglobulin promoter, None) , ( protein: octamer-binding proteins, 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: novel B cell-specific coactivator, None) , ( protein: OBF-1, None) , ( DNA: immunoglobulin promoter, None) , ( protein: octamer-binding proteins, None) 