In the transgenic mice , all the lymphoid tissues examined showed a dramatic reduction in the number of B lymphocytes ( B cells ) .
in the transgenic mice , all the lymphoid tissues examined showed a dramatic reduction in the number of b lymphocytes ( b cells ) .
O O B-multi_cell I-multi_cell O O O B-tissue I-tissue O O O O O O O O O B-cell_type I-cell_type O B-cell_type I-cell_type O O