5760
We investigated whether the inability to maintain EBV-positive NPC cell lines in culture was related to Qp activity .
 EBV-positive NPC cell lines, Qp
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 EBV-positive NPC cell lines, Qp