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In seven EBV-B cell clones or lines differing in their capacity to secrete IL-2 , the activity of the IL-2 promoter correlated well with the status of IL-2 secretion .
 IL-2, IL-2, IL-2, EBV-B cell clones, IL-2 promoter
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:
 IL-2, IL-2, IL-2, EBV-B cell clones, IL-2 promoter