tokens: The human T-cell leukemia virus type I ( HTLV-I ) promoter contains three copies of imperfect repeats of a 21-base pair sequence designated here as TRE ( Tax -response element ) that is responsive to the virally encoded transactivator protein Tax .
folded_tokens: the human t-cell leukemia virus type i ( htlv-i ) promoter contains three copies of imperfect repeats of a 21-base pair sequence designated here as tre ( tax -response element ) that is responsive to the virally encoded transactivator protein tax .
labels: O B-virus I-virus I-virus I-virus I-virus I-virus O B-virus O O O O O O O O O O B-polynucleotide I-polynucleotide I-polynucleotide O O O B-DNA_domain_or_region O B-protein_molecule O O O O O O O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group B-protein_molecule O