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Considering the strong positive regulatory effect of this element and its presence in several T-cell-expressed cytokine genes , it may be crucial to the coordinated expression of these cytokines in T helper cells .
 ( DNA: T-cell-expressed cytokine genes, None) , ( protein: cytokines, None) , ( DNA: element, None) , ( cell type: T helper 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:
 ( DNA: T-cell-expressed cytokine genes, None) , ( protein: cytokines, None) , ( DNA: element, None) , ( cell type: T helper cells, None) 