tokens: Using deletion constructs , we have defined an active promoter region of 1056 bp .
folded_tokens: using deletion constructs , we have defined an active promoter region of 1056 bp .
labels: O B-DNA_family_or_group I-DNA_family_or_group O O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O O