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In contrast, cAMP almost completely inhibited the PMA -dependent activation of the endogenous IL-2 gene , as well as the transfected IL-2 promoter .
 IL-2 gene, endogenous IL-2 gene, IL-2, IL-2 promoter, 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 gene, endogenous IL-2 gene, IL-2, IL-2 promoter, IL-2