tokens: Interestingly , PIF was constitutively activated in human T-cell leukemia virus type 1 -transformed MT-2 cells .
folded_tokens: interestingly , pif was constitutively activated in human t-cell leukemia virus type 1 -transformed mt-2 cells .
labels: O O B-protein_family_or_group O O O O B-virus I-virus I-virus I-virus I-virus I-virus O O O O