tokens: The replaced enhancer is propagated to the 5' LTR upon integration into the target cell genome .
folded_tokens: the replaced enhancer is propagated to the 5' ltr upon integration into the target cell genome .
labels: O B-DNA_domain_or_region I-DNA_domain_or_region O O O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O B-DNA_family_or_group I-DNA_family_or_group I-DNA_family_or_group O