In contrast , Spi-B is expressed exclusively in lymphoid cells and can be detected in early fetal thymus and spleen .
in contrast , spi-b is expressed exclusively in lymphoid cells and can be detected in early fetal thymus and spleen .
O O O B-protein_molecule O O O O B-cell_type I-cell_type O O O O O O B-body_part I-body_part O B-body_part O