A factor ( s ) , which is processed by and acts upon a variety of cell types , was detected by addition to non-irradiated cells of either X-ray -treated cells or a conditioned medium taken from irradiated cultures .
a factor ( s ) , which is processed by and acts upon a variety of cell types , was detected by addition to non-irradiated cells of either x-ray -treated cells or a conditioned medium taken from irradiated cultures .
O O O O O O O O O O O O O O O O O O O O O O O O B-cell_type I-cell_type O O B-other_name O O O O O O O O B-cell_line I-cell_line O