To test this, we employed RPE cells generated from iPSCs derived from a retinitis pigmentosa individual carrying biallelic nonsense mutations in the MerTK gene, leading to loss of MerTK protein expression, phagocytosis deficiency, and blindness (Fig. 10, a–d, and Fig. S5 j; Ramsden et al., 2017). The gene discussed is MERTK; the disease is retinitis pigmentosa.