tokens: Furthermore , we demonstrate that binding of several B cell-specific transcription factors , essential for IgH 3' enhancer activity , is lacking , which may explain 3' enhancer inactivity , although the binding of repressors cannot be excluded .
folded_tokens: furthermore , we demonstrate that binding of several b cell-specific transcription factors , essential for igh 3' enhancer activity , is lacking , which may explain 3' enhancer inactivity , although the binding of repressors cannot be excluded .
labels: O O O O O O O O B-protein_family_or_group I-protein_family_or_group B-protein_family_or_group I-protein_family_or_group 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 O B-other_name I-other_name I-other_name O O O O O O O O O O