tokens: The human immunodeficiency virus type 1 long terminal repeat , HIV-1-LTR , contains binding sites for several cellular transcription factors which contribute to HIV-1 gene expression .
folded_tokens: the human immunodeficiency virus type 1 long terminal repeat , hiv-1-ltr , contains binding sites for several cellular transcription factors which contribute to hiv-1 gene expression .
labels: O B-virus I-virus I-virus I-virus I-virus O O O O B-DNA_domain_or_region O O O O O O O O O O O O B-DNA_molecule I-DNA_molecule O O