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A theoretical pathway of transcriptional regulation of the androgen receptor (AR) gene is via a cAMP response element ( CRE ) present in its promoter region (-508 to -501).
 CRE, promoter region, androgen receptor (AR) gene, cAMP response element
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:
 CRE, promoter region, androgen receptor (AR) gene, cAMP response element