Subsequently , a 1 . 8 kilobase ( kb ) fragment of the CIITA promoter was isolated and sequenced .
subsequently , a 1 . 8 kilobase ( kb ) fragment of the ciita promoter was isolated and sequenced .
O O O B-DNA_molecule I-DNA_molecule I-DNA_molecule I-DNA_molecule I-DNA_molecule I-DNA_molecule I-DNA_molecule I-DNA_molecule O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O