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The major focus of this research is to define the cis -acting elements which are required for the formation of these domains of unique chromatin structure .
 chromatin structure, cis -acting elements
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:
 chromatin structure, cis -acting elements