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Previously, we analyzed the proximal IL-4 promoter in directing Th2-specific activity .
 IL-4, proximal IL-4 promoter, IL-4 promoter
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-4, proximal IL-4 promoter, IL-4 promoter