tokens: The infection of a variety of cultured and primary lymphoid cells with a recombinant retrovirus containing a histone promoter-driven beta-galactosidase gene is shown to result in the expression of beta-galactosidase in 50% to 100% of the cells .
folded_tokens: the infection of a variety of cultured and primary lymphoid cells with a recombinant retrovirus containing a histone promoter-driven beta-galactosidase gene is shown to result in the expression of beta-galactosidase in 50% to 100% of the cells .
labels: O O O O O O O O B-cell_type I-cell_type I-cell_type O O B-other_artificial_source I-other_artificial_source O O B-protein_molecule I-protein_molecule I-protein_molecule O O O O O O O O O B-protein_molecule O O O O O O O O