7531
Type I interferons and stromal cells stimulate apparently identical signaling pathways, leading to STAT-1 activation .
 ( cell type: stromal cells, None) , ( protein: STAT-1, None) , ( protein: Type I interferons, 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:
 ( cell type: stromal cells, None) , ( protein: STAT-1, None) , ( protein: Type I interferons, None) 