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We previously identified the P sequence as a critical regulatory element of the human IL-4 promoter .
 P sequence, human IL-4 promoter, regulatory element
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:
 P sequence, human IL-4 promoter, regulatory element