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A cell culture system was then employed that permitted the differentiation of Th effectors from resting memory T cells by short term priming.
 ( protein: Th effectors, None) , ( cell line: cell culture system, None) , ( cell type: resting memory T 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: Th effectors, None) , ( cell line: cell culture system, None) , ( cell type: resting memory T cells, None) 