12840
Cross-linking of FcR with immune complexes leads, first to activation of protein- tyrosine kinases .
 ( protein: immune complexes, None) , ( protein: protein- tyrosine kinases, None) , ( protein: FcR, 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: immune complexes, None) , ( protein: protein- tyrosine kinases, None) , ( protein: FcR, None) 