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By comparing the expression of genes controlling apoptosis , including those encoding several members of the BCL-2 family of proteins, the known relative resistance of EBV -immortalized B-cell lines to apoptosis induced by low serum was found to correlate with expression of both BCL-2 and A20 .
 EBV -immortalized B-cell lines, A20, BCL-2 family, BCL-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:
 EBV -immortalized B-cell lines, A20, BCL-2 family, BCL-2