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Interleukin-4 ( IL-4 ) plays a major role in this process by promoting the differentiation of IL-4 -secreting Th2 cells.
 Interleukin-4, IL-4, IL-4
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:
 Interleukin-4, IL-4, IL-4