12914
Downstream activation of a TATA-less promoter by Oct-2 , Bob1, and NF-kappaB directs expression of the homing receptor BLR1 to mature B cells .
 ( protein: NF-kappaB, None) , ( protein: Oct-2, None) , ( protein: homing receptor BLR1, None) , ( cell type: mature B cells, None) , ( DNA: TATA-less promoter, None) , ( protein: BLR1, 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: NF-kappaB, None) , ( protein: Oct-2, None) , ( protein: homing receptor BLR1, None) , ( cell type: mature B cells, None) , ( DNA: TATA-less promoter, None) , ( protein: BLR1, None) 