5760
We investigated whether the inability to maintain EBV-positive NPC cell lines in culture was related to Qp activity .
 ( cell line: EBV-positive NPC cell lines, None) , ( DNA: Qp, 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: EBV-positive NPC cell lines, None) , ( DNA: Qp, None) 