4696
Therefore, a STAT1 transcription factor is activated by IFN-gamma synthesized and released upon stimulation of T lymphocyte populations .
 ( protein: IFN-gamma, None) , ( protein: transcription factor, None) , ( cell type: T lymphocyte populations, None) , ( protein: STAT1, 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: IFN-gamma, None) , ( protein: transcription factor, None) , ( cell type: T lymphocyte populations, None) , ( protein: STAT1, None) 