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In the present report, we studied the role of the stromal-derived cytokine interleukin-7 ( IL-7 ) in the IL-2-gene regulation in activated T lymphocytes .
 stromal-derived cytokine, interleukin-7, IL-7, stromal-derived cytokine interleukin-7, IL-2-gene, activated T lymphocytes
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:
 stromal-derived cytokine, interleukin-7, IL-7, stromal-derived cytokine interleukin-7, IL-2-gene, activated T lymphocytes