We reported here that the E1B 19K mutant viruses were unable to replicate efficiently in a monocyte cell line , U937 .
we reported here that the e1b 19k mutant viruses were unable to replicate efficiently in a monocyte cell line , u937 .
O O O O O B-protein_molecule I-protein_molecule O O O O O O O O O B-cell_line I-cell_line I-cell_line O B-cell_line O