The activity of DNA relaxing enzymes ( e . g . topoisomerases I and II ) in nuclear extracts was measured using a PBR 322-relaxation-assay .
the activity of dna relaxing enzymes ( e . g . topoisomerases i and ii ) in nuclear extracts was measured using a pbr 322-relaxation-assay .
O O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O O O O O O O O O O O B-cell_component I-cell_component O O O O B-other_name I-other_name O