12217
Only a few cells showed viral capsid antigen ( VCA ).
 ( protein: VCA, None) , ( protein: viral capsid antigen, 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: VCA, None) , ( protein: viral capsid antigen, None) 