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Interleukin 4 activates a signal transducer and activator of transcription (Stat) protein which interacts with an interferon-gamma activation site-like sequence upstream of the I epsilon exon in a human B cell line .
 ( protein: transcription (Stat) protein, None) , ( cell line: human B cell line, None) , ( DNA: interferon-gamma activation site-like sequence, None) , ( protein: Interleukin 4, None) , ( DNA: I epsilon exon, 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: transcription (Stat) protein, None) , ( cell line: human B cell line, None) , ( DNA: interferon-gamma activation site-like sequence, None) , ( protein: Interleukin 4, None) , ( DNA: I epsilon exon, None) 