Bipotential T/natural killer ( NK ) progenitor cells are present in the human thymus .
bipotential t/natural killer ( nk ) progenitor cells are present in the human thymus .
B-cell_type I-cell_type I-cell_type I-cell_type I-cell_type I-cell_type I-cell_type I-cell_type O O O O B-body_part I-body_part O