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REVs do not encode a transactivator targeted to the viral LTR , and cells infected with Marek's disease virus , a herpesvirus with an overlapping host range, do not express factors that preferentially enhance expression from REV or avian sarcoma/leukemia virus LTRs .
 DNA: viral LTR; DNA: avian sarcoma/leukemia virus LTRs
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: viral LTR; DNA: avian sarcoma/leukemia virus LTRs