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This is the first description of an HIV-2 enhancer element which displays such monocyte specificity, and no comparable enhancer element has been clearly defined for HIV-1 .
 DNA: enhancer element; DNA: HIV-2 enhancer element
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: enhancer element, HIV-2 enhancer element 
Answer:
 DNA: enhancer element; DNA: HIV-2 enhancer element