We quantified the number of SCs (SOX2+) seven days after ad-Myc/ad-Cre infection in Rosa-NICD cochleae in the mid-apical region, which included outer pillar cells, Deiters’ cells, Hensen cells and Claudius’ cells (Fig. 1a), and found a significant increase in the total number of BrdU+ cells and SCs in ad-Myc/ad-Cre-infected cochleae compared to the ad-V5-infected controls (Fig. 2j, k). Here, SOX2 is linked to infection.