tokens: Although sequences located between -559 and -88 of the zeta 2 globin gene were dispensable for its expression on enhancerless plasmids , they were required for the HS-40 enhancer -mediated activity of the zeta 2 globin promoter .
folded_tokens: although sequences located between -559 and -88 of the zeta 2 globin gene were dispensable for its expression on enhancerless plasmids , they were required for the hs-40 enhancer -mediated activity of the zeta 2 globin promoter .
labels: O O O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O O O O B-DNA_family_or_group I-DNA_family_or_group O O O O O O B-DNA_domain_or_region O O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O