It has been shown that this E1B 19K protein is not necessary for viral DNA replication in human cell lines , such as HeLa and KB .
it has been shown that this e1b 19k protein is not necessary for viral dna replication in human cell lines , such as hela and kb .
O O O O O O B-protein_molecule I-protein_molecule I-protein_molecule O O O O O B-other_name I-other_name O B-cell_line I-cell_line I-cell_line O O O B-cell_line O B-cell_line O