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 .
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 .
B-virus O O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O B-virus I-virus I-virus O O B-virus O O O O O O O O O O O O O O O B-virus O B-virus I-virus I-virus O O