9054
T cell proliferation was induced by three peptides , P1 , P4 , and P7 , in 71-100% of the donors tested before and after vaccination using DC as APC .
 ( cell type: DC, None) , ( cell type: APC, 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 type: DC, None) , ( cell type: APC, None) 