11675
These observations implicated c-Rel as an IL-2 promoter factor , for which experimental support was obtained from transient transfection experiments .
 ( protein: c-Rel, None) , ( protein: IL-2 promoter factor, 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: c-Rel, None) , ( protein: IL-2 promoter factor, None) , ( protein: IL-2, None) 