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We have now identified a novel cis-acting element within the HIV-2 enhancer , immediately upstream of the kappa B site , designated peri-kappa B .
 ( DNA: kappa B site, None) , ( DNA: cis-acting element, None) , ( DNA: peri-kappa B, None) , ( DNA: HIV-2 enhancer, 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: kappa B site, None) , ( DNA: cis-acting element, None) , ( DNA: peri-kappa B, None) , ( DNA: HIV-2 enhancer, None) 