We investigated the function of the evolutionary conserved X2 box in the promoter of the HLA-DRA gene from the human major histocompatibility complex ( MHC ) in resting and activated B cells .
we investigated the function of the evolutionary conserved x2 box in the promoter of the hla-dra gene from the human major histocompatibility complex ( mhc ) in resting and activated b cells .
O O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O O B-DNA_domain_or_region O O B-DNA_domain_or_region I-DNA_domain_or_region O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O B-protein_family_or_group O O O O O B-cell_type I-cell_type O