Role of the X2 box in activated transcription from the DRA promoter in B cells .
role of the x2 box in activated transcription from the dra promoter in b cells .
O O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O B-cell_type I-cell_type O