10451
By transfecting tumor cells with both IL-12 and B7.1 cDNAs , it may be possible to use these modified targets as vaccines .
 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:
 None