1390
Since expression of the viruses is in large part regulated by the sequence elements in their long terminal repeats ( LTRs ), this study was directed to an analysis of the regulatory elements in the HIV-2 LTR .
 DNA: LTRs; DNA: regulatory elements; DNA: HIV-2 LTR; DNA: long terminal repeats; DNA: sequence elements
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 DNA: LTRs; DNA: regulatory elements; DNA: HIV-2 LTR; DNA: long terminal repeats; DNA: sequence elements