4040
The extent to which peptides containing chemically and post-translationally modified amino acid side chains are recognized by primed CTL has not been clearly defined.
 ( cell line: primed CTL, None) , ( protein: amino acid side chains, 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:
 ( cell line: primed CTL, None) , ( protein: amino acid side chains, None) 