tokens: Human immunodeficiency virus type 1 ( HIV-1 ) replicates more efficiently in vitro in differentiated macrophages than in freshly isolated monocytes .
folded_tokens: human immunodeficiency virus type 1 ( hiv-1 ) replicates more efficiently in vitro in differentiated macrophages than in freshly isolated monocytes .
labels: B-virus I-virus I-virus I-virus I-virus O B-virus O O O O O O O B-cell_type I-cell_type O O B-cell_type I-cell_type B-cell_type O