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In summary, we have identified a tissue-specific regulatory region 5' of the ecto-5'-NT core promoter that requires the presence of a functional CRE site within the basal promoter for its suppressive activity .
 tissue-specific regulatory region, ecto-5'-NT core promoter, CRE site, basal promoter
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:
 tissue-specific regulatory region, ecto-5'-NT core promoter, CRE site, basal promoter