tokens: Immortalization of CD4 ( + ) and CD8 ( + ) T lymphocytes by human T-cell leukemia virus type 1 Tax mutants expressed in a functional molecular clone .
folded_tokens: immortalization of cd4 ( + ) and cd8 ( + ) t lymphocytes by human t-cell leukemia virus type 1 tax mutants expressed in a functional molecular clone .
labels: B-other_name O O O O O O O O O O O O O B-virus I-virus I-virus I-virus I-virus I-virus B-protein_family_or_group I-protein_family_or_group O O O B-cell_line I-cell_line I-cell_line O