6052
Reporter gene experiments finally showed that transcription from promoters of STAT5 target genes can be specifically induced by challenging cells with IL-4 , and that both STAT5a and STAT5b can contribute to IL-4 -triggered transcriptional control .
 ( protein: IL-4, None) , ( protein: STAT5b, None) , ( protein: STAT5, None) , ( protein: IL-4, None) , ( protein: STAT5a, 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) , ( protein: STAT5b, None) , ( protein: STAT5, None) , ( protein: IL-4, None) , ( protein: STAT5a, None) 