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In this paper we have investigated the role of Egr-1 in B cell growth regulation by examining the gene expression in a panel of B cell lines , including both EBV genome negative and EBV carrying cell lines .
 B cell lines, EBV genome, EBV carrying cell lines, Egr-1
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:
 B cell lines, EBV genome, EBV carrying cell lines, Egr-1