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These data suggest that IL-4 promoter activity is normally down-regulated by an NRE via repression of the enhancer positive regulatory element .
 DNA: enhancer positive regulatory element; DNA: NRE; DNA: IL-4 promoter
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 DNA: enhancer positive regulatory element; DNA: NRE; DNA: IL-4 promoter