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Composite elements are regulatory modules of promoters or enhancers that consist of binding sites of two different but synergizing transcription factors .
 promoters, regulatory modules, Composite elements, enhancers, transcription factors
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:
 promoters, regulatory modules, Composite elements, enhancers, transcription factors