Representative images of peripapillary ganglion cells stained with BRN3A are shown in Figure 3A. The peripapillary ganglion cell density remained unchanged in controls as they grew (6 vs. 12-month-old control eyes, p > 0.05), but was significantly lower in the peripapillary retina of marmosets induced with myopia for 4 months (Figure 3B, p < 0.05). The gene discussed is POU4F1; the disease is myopia.