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By using deletion mutants of the c-fos promoter , we found that the minimal DNA sequence required for Tat activity was located between nucleotides -404/-220 and that the serum responsive element ( SRE , -317/-288 ), present within this region, was still responsive to Tat .
 ( DNA: SRE, None) , ( DNA: c-fos promoter, None) , ( DNA: serum responsive element, None) , ( DNA: -317/-288, None) , ( protein: Tat, None) , ( protein: Tat, None) , ( DNA: nucleotides -404/-220, None) , ( DNA: minimal DNA sequence, 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: SRE, None) , ( DNA: c-fos promoter, None) , ( DNA: serum responsive element, None) , ( DNA: -317/-288, None) , ( protein: Tat, None) , ( protein: Tat, None) , ( DNA: nucleotides -404/-220, None) , ( DNA: minimal DNA sequence, None) 