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Using deletion mutants and specific CD4 promoter mutants , we identified an ATF/CRE binding site located at nucleotides -67 to -60 upstream of the CD4 gene transcription start site that is important for HHV-6 transactivation .
 CD4 gene, CD4 promoter mutants, ATF/CRE binding site, CD4 promoter, CD4 gene transcription start site, nucleotides -67 to -60 upstream
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:
 CD4 gene, CD4 promoter mutants, ATF/CRE binding site, CD4 promoter, CD4 gene transcription start site, nucleotides -67 to -60 upstream