Together the Act-1 and CBF sites form a functional unit ( AC unit ) with dual activity .
together the act-1 and cbf sites form a functional unit ( ac unit ) with dual activity .
O O B-DNA_domain_or_region O B-DNA_domain_or_region I-DNA_domain_or_region O O B-DNA_domain_or_region I-DNA_domain_or_region O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O