5508
Signal transducers and activators of transcription ( STATs ) are rapidly phosphorylated on tyrosine residues in response to cytokine and growth factor stimulation of cell surface receptors .
 ( protein: Signal transducers and activators of transcription, None) , ( protein: cell surface receptors, None) , ( protein: STATs, None) , ( protein: growth factor, None) , ( protein: cytokine, 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, None) , ( protein: cell surface receptors, None) , ( protein: STATs, None) , ( protein: growth factor, None) , ( protein: cytokine, None) 