4431
Differential utilization of Janus kinase -signal transducer activator of transcription signaling pathways in the stimulation of human natural killer cells by IL-2 , IL-12 , and IFN-alpha .
 ( protein: IL-2, None) , ( protein: IFN-alpha, None) , ( cell type: human natural killer cells, None) , ( protein: IL-12, None) , ( protein: Janus kinase, 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-2, None) , ( protein: IFN-alpha, None) , ( cell type: human natural killer cells, None) , ( protein: IL-12, None) , ( protein: Janus kinase, None) 