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The ATF/CRE site is also essential for CD4 promoter activation by forskolin, an activator of adenylate cyclase .
 ( DNA: CD4 promoter, None) , ( DNA: ATF/CRE site, 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: CD4 promoter, None) , ( DNA: ATF/CRE site, None) 