tokens: Deletion and base substitution mutations along with DNA binding studies demonstrated that the enhancer contained a minimum of three functional protein binding sequences , two of which appeared to be important for gene induction .
folded_tokens: deletion and base substitution mutations along with dna binding studies demonstrated that the enhancer contained a minimum of three functional protein binding sequences , two of which appeared to be important for gene induction .
labels: 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 B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O O O O O O O O O O