tokens: Studies with 5' deletion CD20 promoter-CAT constructs have previously revealed two regions of the promoter between bases -186 and -280 and between bases -280 and -454 which contained positive regulatory elements .
folded_tokens: studies with 5' deletion cd20 promoter-cat constructs have previously revealed two regions of the promoter between bases -186 and -280 and between bases -280 and -454 which contained positive regulatory elements .
labels: O O B-DNA_molecule I-DNA_molecule I-DNA_molecule I-DNA_molecule I-DNA_molecule O O O O O O O B-DNA_domain_or_region O O O O O O O O O O O O O B-DNA_family_or_group I-DNA_family_or_group I-DNA_family_or_group O