c("cell line: C666", "sample type: undifferentiated Epstein-Barr virus (EBV)-positive NPC cell line")
c("cell line: X666", "sample type: undifferentiated Epstein-Barr virus (EBV)-positive NPC xenograft")
c("cell line: NP460", "sample type: immortalized nasopharyngeal epithelial cell line")
c("cell line: HK1", "sample type: well-differentiated NPC cell line")