Moreover , simian virus 40 enhancer activity was blocked by the MnlI-AluI fragment in HeLa cells but not in B cells .
moreover , simian virus 40 enhancer activity was blocked by the mnli-alui fragment in hela cells but not in b cells .
O O B-virus I-virus I-virus B-other_name I-other_name O O O O B-DNA_domain_or_region I-DNA_domain_or_region O B-cell_line I-cell_line O O O B-cell_type I-cell_type O