tokens: We studied the functional interaction between human embryonic zeta 2 globin promoter and the alpha globin regulatory element ( HS-40 ) located 40 kb upstream of the zeta 2 globin gene .
folded_tokens: we studied the functional interaction between human embryonic zeta 2 globin promoter and the alpha globin regulatory element ( hs-40 ) located 40 kb upstream of the zeta 2 globin gene .
labels: 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 I-DNA_domain_or_region I-DNA_domain_or_region O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O B-DNA_domain_or_region O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O