tokens: A mutant LTR containing four base pair substitutions in the ets-1 binding site was constructed and was shown to have reduced binding in vitro .
folded_tokens: a mutant ltr containing four base pair substitutions in the ets-1 binding site was constructed and was shown to have reduced binding in vitro .
labels: O B-DNA_domain_or_region I-DNA_domain_or_region O O B-other_name I-other_name I-other_name O O B-protein_molecule O O O O O O O O O B-other_name I-other_name O O O