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The P sequence of the IL-4 gene , defined as a responsive element for PMA and calcium ionophore ( A23187 ), shares sequence similarity with the NF kappa B and the NF-activated T cell binding sites .
 P sequence, IL-4 gene, responsive element, 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:
 P sequence, IL-4 gene, responsive element, IL-4