6705
Binding of NF-AT , NF-kappaB , and AP-1 was induced by T-cell receptor ( TcR ) stimulation , although there was no significant upregulation of binding by IL-2 stimulation .
 ( protein: AP-1, None) , ( protein: NF-kappaB, None) , ( protein: NF-AT, None) , ( protein: TcR, None) , ( protein: IL-2, None) , ( protein: T-cell receptor, 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: AP-1, None) , ( protein: NF-kappaB, None) , ( protein: NF-AT, None) , ( protein: TcR, None) , ( protein: IL-2, None) , ( protein: T-cell receptor, None) 