13369
Expression of the IL-2 gene requires activation of T cells through stimulation of the TCR and costimulation through accessory receptors .
 ( protein: IL-2, None) , ( DNA: IL-2 gene, None) , ( cell type: T cells, None) , ( protein: accessory receptors, None) , ( protein: TCR, 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: IL-2 gene, None) , ( cell type: T cells, None) , ( protein: accessory receptors, None) , ( protein: TCR, None) 