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In the present study we analyzed the control of IL-2 promoter activity in Epstein-Barr virus ( EBV )-transformed B cell clones which are capable of secreting IL-2 at a low level after stimulation with phorbol 12-myristate 13-acetate and the Ca2+ ionophore ionomycin .
 IL-2, IL-2 promoter, Epstein-Barr virus ( EBV )-transformed B cell clones, IL-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:
 IL-2, IL-2 promoter, Epstein-Barr virus ( EBV )-transformed B cell clones, IL-2