The NFATd element , which binds the transcription factor NFAT-1 and is very active in T cells , is only weakly active in one B clone and not at all in another .
the nfatd element , which binds the transcription factor nfat-1 and is very active in t cells , is only weakly active in one b clone and not at all in another .
O B-DNA_domain_or_region I-DNA_domain_or_region O O O O B-protein_family_or_group I-protein_family_or_group B-protein_molecule O O O O O B-cell_type I-cell_type O O O O O O O B-cell_line I-cell_line O O O O O O O