5581
The Jak family of tyrosine kinases are known to mediate some of the effects of cytokines or hematopoietic growth factors by recruitment and tyrosine phosphorylation of a variety of Stat ( signal transducers and activators of transcription ) proteins.
 ( protein: tyrosine kinases, None) , ( protein: hematopoietic growth factors, None) , ( protein: Stat, None) , ( protein: cytokines, None) , ( protein: signal transducers and activators of transcription, 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: tyrosine kinases, None) , ( protein: hematopoietic growth factors, None) , ( protein: Stat, None) , ( protein: cytokines, None) , ( protein: signal transducers and activators of transcription, None) 