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Transcription factors USF1 and USF2 up-regulate gene expression (i.e., HIV-1 long terminal repeats ) via interaction with an E box on their target promoters, which is also a binding site for c-Myc .
 E box, Transcription factors, USF1, c-Myc, USF2, HIV-1 long terminal repeats, binding site
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:
 E box, Transcription factors, USF1, c-Myc, USF2, HIV-1 long terminal repeats, binding site