12296
We have used a human T-lymphotropic virus type 1 ( HTLV-1 ) model of cAMP response element ( CRE ) transcription to investigate the influence of lymphocyte activation on transcription from homologous regions in the viral promoter .
 CRE, cAMP response element, viral 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:
 CRE, cAMP response element, viral promoter