4550
Therefore, as T cells progress from primary TCR activation through IL-2 -dependent proliferation, followed by secondary TCR stimulation , their responsiveness to IFN-gamma varies, and this may affect their ability to participate in an ongoing immune response .
 ( protein: IL-2, None) , ( protein: TCR, None) , ( cell type: T cells, None) , ( protein: IFN-gamma, 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) , ( protein: TCR, None) , ( cell type: T cells, None) , ( protein: IFN-gamma, None) , ( protein: TCR, None) 