When single-point mutation was introduced to each GC box , EBS , and GT box in PFP9a20 , at least 3-fold less CAT activity was observed in CTLL-R8 cells .
when single-point mutation was introduced to each gc box , ebs , and gt box in pfp9a20 , at least 3-fold less cat activity was observed in ctll-r8 cells .
O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O B-DNA_domain_or_region O O B-DNA_domain_or_region I-DNA_domain_or_region O B-DNA_molecule O O O O O B-protein_molecule O O O O B-cell_line I-cell_line O