We noticed that only a small portion of GFP+ cells turned out to be MYO7A+ HCLCs in both the sensory epithelial region and the limbus region after the infection of Ad-Atoh1 (16.00 ± 2.18% for the sensory epithelium, 12.57 ± 3.29% for the spiral limbus region) (Supplementary Figures 3d,e). Here, ATOH1 is linked to infection.