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Production of IL-2 requires the formation of transcription factors involved in the IL-2 -gene regulation .
 IL-2 -gene, IL-2, IL-2, transcription factors
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, IL-2, IL-2, transcription factors