12846
However, MAPK activation was easily detected by in vitro kinase assays , after FcR cross-linking with immune complexes .
 ( protein: FcR, None) , ( protein: MAPK, None) , ( protein: immune complexes, 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: FcR, None) , ( protein: MAPK, None) , ( protein: immune complexes, None) 