Transcription factor requirements for U2 snRNA -encoding gene activation in B lymphoid cells .
transcription factor requirements for u2 snrna -encoding gene activation in b lymphoid cells .
B-protein_family_or_group I-protein_family_or_group O O B-RNA_family_or_group I-RNA_family_or_group O O O O B-cell_type I-cell_type I-cell_type O