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These results identify a transcriptional regulatory element associated with a nuclease- hypersensitive site in the pol gene of HIV-1 and suggest that its activity may be controlled by a complex interplay of cis- regulatory elements .
 pol gene, regulatory elements, nuclease- hypersensitive site, transcriptional regulatory element, hypersensitive 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:
 pol gene, regulatory elements, nuclease- hypersensitive site, transcriptional regulatory element, hypersensitive site