958
We deduce from these results that EBNA-2 -positive cells might indeed contain specific complexes bound to the LMP promoter which are, however, too labile to be detected in a standard gel retardation assay .
 EBNA-2 -positive cells, specific complexes, LMP promoter, EBNA-2
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:
 EBNA-2 -positive cells, specific complexes, LMP promoter, EBNA-2