4931
These phosphotyrosines serve as docking sites for latent, cytoplasmic transcription factors known as signal transducers and activators of transcription (Stat) proteins .
 ( protein: signal transducers and activators of transcription (Stat) proteins, None) , ( protein: cytoplasmic transcription factors, None) , ( protein: transcription factors, None) , ( protein: docking sites, 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: signal transducers and activators of transcription (Stat) proteins, None) , ( protein: cytoplasmic transcription factors, None) , ( protein: transcription factors, None) , ( protein: docking sites, None) 