These domains , which have been characterized as DNase I hypersensitive sites ( HSs ) , comprise the active elements of the LCR .
these domains , which have been characterized as dnase i hypersensitive sites ( hss ) , comprise the active elements of the lcr .
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 B-DNA_domain_or_region O O O O O O O O B-DNA_domain_or_region O