Of that collection of plasma cells. Isolate those plasma cells that we actually want to study because those plasma cells produce the antibody of interest. Now, once we isolate those specific plasma cells, we can then divide those plasma cells many times via mitosis. And those plasma cells, as they grow, they produce those antibodies that we want to study. So in this way, theoretically, we should be able to actually build as many specific antibodies as we'd like. Now, the problem with the method is, as soon as we take out that plasma cell from that organism, that plasma cell essentially dies.