In addition , these promoters respond only indirectly to the viral immediate-early transactivator , ZEBRA .
in addition , these promoters respond only indirectly to the viral immediate-early transactivator , zebra .
O O O O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O B-DNA_domain_or_region O