tokens: Cross competition experiments with an octamer sequence from the Ig heavy chain promoter , the BAT box , and a TA-rich sequence present in the CD21 promoter revealed that all three sequences bound the same nuclear proteins suggesting that the BAT box binding proteins were Oct-1 and Oct-2 .
folded_tokens: cross competition experiments with an octamer sequence from the ig heavy chain promoter , the bat box , and a ta-rich sequence present in the cd21 promoter revealed that all three sequences bound the same nuclear proteins suggesting that the bat box binding proteins were oct-1 and oct-2 .
labels: O O O O O O O O O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O O O B-DNA_substructure I-DNA_substructure O O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O O O O B-protein_family_or_group I-protein_family_or_group O O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O B-protein_family_or_group O B-protein_molecule O