4707
All T-cell lines tested were positive for TCF-1 and GATA-3 , which are the transcription factors for promoters for several T-cell-restricted markers , including CD2 , CD3 , TcR , and lck .
 ( protein: lck, None) , ( protein: GATA-3, None) , ( protein: TCF-1, None) , ( protein: transcription factors, None) , ( protein: CD3, None) , ( cell line: T-cell lines, None) , ( protein: CD2, None) , ( protein: T-cell-restricted markers, 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: lck, None) , ( protein: GATA-3, None) , ( protein: TCF-1, None) , ( protein: transcription factors, None) , ( protein: CD3, None) , ( cell line: T-cell lines, None) , ( protein: CD2, None) , ( protein: T-cell-restricted markers, None) , ( protein: TcR, None) 