5688
In support of this model, we report that the human IL-4 promoter exists in multiple allelic forms that exhibit distinct transcriptional activities in IL-4 -positive T cells .
 ( protein: IL-4, None) , ( DNA: human IL-4 promoter, None) , ( cell type: IL-4 -positive T cells, None) , ( protein: IL-4, 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: IL-4, None) , ( DNA: human IL-4 promoter, None) , ( cell type: IL-4 -positive T cells, None) , ( protein: IL-4, None) 