tokens: A protein of about 150 kD that bound to this negative regulatory sequence was identified by UV cross-linking .
folded_tokens: a protein of about 150 kd that bound to this negative regulatory sequence was identified by uv cross-linking .
labels: O O O O B-protein_molecule I-protein_molecule O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O B-other_name I-other_name O