So the question is, how can we mass produce the monoclonal antibodies specific for some antigen? If the antigen producing cells, our plasma cells quickly die as soon as we take them out of that organism. So the trick is to basically somehow take the plasma cell that we isolated for that specific antibody and turn it into a cancer cell. Because remember, cancer cells are immortal cells. They essentially divide outside that organism. They can divide on any medium that contains nutrients, and they divide indefinitely.