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Significantly, the CBF sites are in each case contained within the minimum essential core regions required for inducible activation of transcription .
 CBF sites, CBF, essential core regions
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:
 CBF sites, CBF, essential core regions