10816
BOB.1/OBF.1 is a transcriptional coactivator that is constitutively expressed in B cells and interacts with the Oct1 and Oct2 transcription factors .
 ( cell type: B cells, None) , ( protein: transcription factors, None) , ( protein: BOB.1/OBF.1, None) , ( protein: transcriptional coactivator, 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:
 ( cell type: B cells, None) , ( protein: transcription factors, None) , ( protein: BOB.1/OBF.1, None) , ( protein: transcriptional coactivator, None) 