tokens: Tat is an essential regulatory protein for the replication of human immunodeficiency virus ( HIV ) .
folded_tokens: tat is an essential regulatory protein for the replication of human immunodeficiency virus ( hiv ) .
labels: B-protein_molecule O O O B-protein_family_or_group I-protein_family_or_group O O O O B-virus I-virus I-virus O B-virus O O