tokens: Bipotential T/natural killer ( NK ) progenitor cells are present in the human thymus .
folded_tokens: bipotential t/natural killer ( nk ) progenitor cells are present in the human thymus .
labels: 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