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We found that the R-responsive element is composed of four protoenhancers that span the whole B domain .
 DNA: B domain; DNA: protoenhancers; DNA: R-responsive element
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: B domain; DNA: protoenhancers; DNA: R-responsive element