4455
Recently it has become clear that these cytokines activate a number of important intracellular signaling molecules , including the Janus kinases JAK1 and JAK3 and members of the transcription factor family of signal transducers and activators of transcription ( STATs ).
 ( protein: Janus kinases, None) , ( protein: intracellular signaling molecules, None) , ( protein: STATs, None) , ( protein: JAK3, None) , ( protein: activators of transcription, None) , ( protein: JAK1, None) , ( protein: signal transducers, None) , ( protein: cytokines, None) , ( protein: transcription factor family, 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: Janus kinases, None) , ( protein: intracellular signaling molecules, None) , ( protein: STATs, None) , ( protein: JAK3, None) , ( protein: activators of transcription, None) , ( protein: JAK1, None) , ( protein: signal transducers, None) , ( protein: cytokines, None) , ( protein: transcription factor family, None) 