5448
This 183-bp region was both cell type specific and responsive to two distinct stimuli, lipopolysaccharide and dibutyryl cAMP , known to regulate B7.1 expression .
 ( DNA: 183-bp region, None) , ( protein: B7.1, 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: 183-bp region, None) , ( protein: B7.1, None) 