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Each binding site contributes to the overall activity of the enhancer , however no single element seems absolutely required for activity.
 DNA: enhancer; DNA: binding site
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; DNA: binding site