1393
This enhancer in HIV-1 is the T-cell activation response element ; in HIV-2 , however, it is the second enhancer that is mainly responsible for activation in response to T-cell activators .
 DNA: second enhancer; DNA: T-cell activation response element; DNA: enhancer
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: second enhancer; DNA: T-cell activation response element; DNA: enhancer