tokens: The human immunodeficiency virus ( HIV ) Rev protein is essential for viral structural protein expression ( Gag , Pol , and Env ) and , hence , for viral replication .
folded_tokens: the human immunodeficiency virus ( hiv ) rev protein is essential for viral structural protein expression ( gag , pol , and env ) and , hence , for viral replication .
labels: O B-virus I-virus I-virus O B-virus O B-protein_molecule I-protein_molecule O O O B-other_name I-other_name I-other_name I-other_name O B-protein_molecule O B-protein_molecule O O B-protein_molecule O O O O O O B-other_name I-other_name O