1372
The element is not activated upon infection of established EBV -negative B-cell lines , indicating that EBV fails to drive these cells to a fully lymphoblastoid phenotype .
 lymphoblastoid phenotype, EBV -negative B-cell lines
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:
 lymphoblastoid phenotype, EBV -negative B-cell lines