Previously , transcription of the c-fos gene has been reported to be transactivated by the viral transcription factor , Tax1 .
previously , transcription of the c-fos gene has been reported to be transactivated by the viral transcription factor , tax1 .
O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O O O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O B-protein_family_or_group O