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We now report the identification of a cDNA clone ( 15B-7 ), from a Jurkat expression library , that binds specifically to the DRE 1 regulatory sequence .
 15B-7, DRE 1 regulatory sequence, DRE 1, Jurkat expression library, cDNA clone
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:
 15B-7, DRE 1 regulatory sequence, DRE 1, Jurkat expression library, cDNA clone