ATOH1 and infection: At 1.6×108 PFU/ml Ad5-EGFP-atoh1, we detected myosin7A-positive cells as early as 60 h following atoh1 infection, 31±2 EHCLCs per 200 μm were detected at 3 DVI in the LER, which increased to 54±4 on 5 DVI, 70±5 on 7 DVI, 67±6 on 9 DVI and 67±2 on 11 DVI (Fig. 4C and D).