tokens: In this paper we demonstrate that the distal region of the human immunodeficiency virus-1 ( HIV-1 ) enhancer , which contains DNA-binding sites for LEF-1 and Ets-1 , also provides a functional context for activation by LEF-1 .
folded_tokens: in this paper we demonstrate that the distal region of the human immunodeficiency virus-1 ( hiv-1 ) enhancer , which contains dna-binding sites for lef-1 and ets-1 , also provides a functional context for activation by lef-1 .
labels: O O O O O O O O O O O B-virus I-virus I-virus O B-virus O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O B-protein_molecule O O O O O O O O O O O B-protein_molecule O