However , transcription from crippled HIV-1 LTRs lacking C/EBP sites can still be induced following activation of U937 cells .
however , transcription from crippled hiv-1 ltrs lacking c/ebp sites can still be induced following activation of u937 cells .
O O B-other_name O B-DNA_domain_or_region B-virus B-DNA_domain_or_region O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O O O B-cell_line I-cell_line O