tokens: Second , recombinant LEF-1 is shown to activate HIV-1 transcription on chromatin-assembled DNA in vitro .
folded_tokens: second , recombinant lef-1 is shown to activate hiv-1 transcription on chromatin-assembled dna in vitro .
labels: O O B-protein_family_or_group B-protein_molecule O O O O B-virus O O B-DNA_family_or_group I-DNA_family_or_group O O O