2549
A transcriptional regulatory element is associated with a nuclease-hypersensitive site in the pol gene of human immunodeficiency virus type 1 .
 transcriptional regulatory element, nuclease-hypersensitive site, pol gene
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:
 transcriptional regulatory element, nuclease-hypersensitive site, pol gene