Mutagenesis indicates that the 21 bp repeats can be subdivided into three motifs , A , B and C , each of which influences the level of tax activation .
mutagenesis indicates that the 21 bp repeats can be subdivided into three motifs , a , b and c , each of which influences the level of tax activation .
B-other_name O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O O O O O B-DNA_N/A O B-DNA_substructure O B-DNA_substructure O O O O O O O O B-protein_molecule O O