Stimulation of U1 cells by LPS alone induced minimal levels of HIV expression , which was significantly enhanced by granulocyte-macrophage colony-stimulating factor ( GM-CSF ) .
stimulation of u1 cells by lps alone induced minimal levels of hiv expression , which was significantly enhanced by granulocyte-macrophage colony-stimulating factor ( gm-csf ) .
O O B-cell_line I-cell_line O B-lipid O O O O O B-virus O O O O O O O B-protein_molecule I-protein_molecule I-protein_molecule O B-protein_molecule O O