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Human T-cell leukemia virus types I ( HTLV-I ) and II ( HTLV-II ) have two nonstructural trans-acting regulatory genes , tax and rex , located in the 3' region of the viral genome .
 DNA: rex; DNA: 3' region; DNA: viral genome; DNA: tax; DNA: nonstructural trans-acting regulatory genes
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: rex; DNA: 3' region; DNA: viral genome; DNA: tax; DNA: nonstructural trans-acting regulatory genes