5443
A cell type-specific enhancer in the human B7.1 gene regulated by NF-kappaB .
 ( DNA: cell type-specific enhancer, None) , ( protein: NF-kappaB, None) , ( DNA: human B7.1 gene, 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:
 ( DNA: cell type-specific enhancer, None) , ( protein: NF-kappaB, None) , ( DNA: human B7.1 gene, None) 