When it comes to the expression levels of myosin-9 in breast cancer cells, MDA-MB-231 cells showed a higher expression of myosin-9 than 231/si cells (Figure 4D), and the mRNA expression of MYH9 in 231/si cells was significantly lower than that in MDA-MB-231 cells (Figure 4E). The gene discussed is MYH9; the disease is breast carcinoma.