11556
IL-2 superinduction by Tat occurred at the transcriptional level , was mediated by the CD28 -responsive element in the IL-2 promoter , and was exclusively dependent on the 29 amino acids encoded by the second exon of Tat .
 ( protein: Tat, None) , ( DNA: IL-2 promoter, None) , ( protein: CD28, None) , ( DNA: second exon of Tat, None) , ( protein: IL-2, None) , ( protein: IL-2, None) , ( protein: 29 amino acids, None) , ( DNA: CD28 -responsive element, None) , ( protein: Tat, 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:
 ( protein: Tat, None) , ( DNA: IL-2 promoter, None) , ( protein: CD28, None) , ( DNA: second exon of Tat, None) , ( protein: IL-2, None) , ( protein: IL-2, None) , ( protein: 29 amino acids, None) , ( DNA: CD28 -responsive element, None) , ( protein: Tat, None) 