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In contrast, soluble factors secreted by stromal cells induce Tcell survival in a resting G0/G1 state .
 ( protein: soluble factors, None) , ( cell type: stromal cells, 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: soluble factors, None) , ( cell type: stromal cells, None) 