tokens: The regulatory regions of several genes specifically expressed in B cells contain functional binding sites for Oct2 .
folded_tokens: the regulatory regions of several genes specifically expressed in b cells contain functional binding sites for oct2 .
labels: O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O O B-cell_type I-cell_type O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O B-protein_molecule O