956
However, analysis of sucrose gradient fractions in the gel retardation assay provided evidence that the LMP promoter -binding proteins form a complex of higher M(r) in EBNA-2 -positive cell extracts .
 LMP promoter, EBNA-2 -positive cell, LMP promoter -binding proteins, 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:
 LMP promoter, EBNA-2 -positive cell, LMP promoter -binding proteins, EBNA-2