11710
The two related protein- tyrosine kinases Syk and Zap are rapidly phosphorylated on tyrosine residues and enzymatically activated upon crosslinking of the T cell antigen receptor .
 ( protein: T cell antigen receptor, None) , ( protein: Zap, None) , ( protein: Syk, None) , ( protein: protein- tyrosine kinases, 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: T cell antigen receptor, None) , ( protein: Zap, None) , ( protein: Syk, None) , ( protein: protein- tyrosine kinases, None) 