3911
We demonstrate that although the individual components of this element do not respond to IL-2 , together they form a composite element capable of conferring IL-2 responsiveness to a heterologous promoter .
 ( protein: IL-2, None) , ( DNA: heterologous promoter, None) , ( protein: IL-2, 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: IL-2, None) , ( DNA: heterologous promoter, None) , ( protein: IL-2, None) 