550
The regulation of interleukin (IL)-2 gene expression has been investigated mainly in T lymphocytes , the predominant producers of IL-2 .
 ( cell type: T lymphocytes, None) , ( DNA: interleukin (IL)-2 gene, 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:
 ( cell type: T lymphocytes, None) , ( DNA: interleukin (IL)-2 gene, None) , ( protein: IL-2, None) 