The N element bound a transcription factor , NTF , that is ubiquitous in cell-type distribution , and NTF was distinct from any of the previously described proteins that bind to similar sequences .
the n element bound a transcription factor , ntf , that is ubiquitous in cell-type distribution , and ntf was distinct from any of the previously described proteins that bind to similar sequences .
O B-DNA_domain_or_region I-DNA_domain_or_region O O B-protein_family_or_group I-protein_family_or_group O B-protein_molecule O O O O O B-protein_N/A I-protein_N/A O O B-protein_molecule O O O O O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O O O O O O