The hierarchy of transcriptional control in B-cell development has recently been analyzed by targeted gene inactivation in the mouse .
the hierarchy of transcriptional control in b-cell development has recently been analyzed by targeted gene inactivation in the mouse .
O O O B-other_name I-other_name O B-other_name I-other_name O O O O O B-other_name I-other_name I-other_name O O B-multi_cell O