13396
Despite the absence of these ER peptides, the TAP1-/- cells were able to efficiently cross-prime E1A- and E1B- specific CTLs following immunization of syngeneic mice .
 ( cell type: TAP1-/- cells, 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: TAP1-/- cells, None) 