For the first one, we seeded the breast cancer cells MCF-7 or ovarian cancer cells A2780 in monolayer as the ‘Targets’ and used red-fluorescent melamine resin particles coated with FN (i.e., FN-beads) as the ‘Effectors’ (Cell–Bead setup; Figure 1B). The gene discussed is FN1; the disease is breast cancer.