Noise-induced lipid peroxidation in HCs and SGNs is reduced by Qter treatment. 4HNE-positive OHCs and SGNs are shown by arrowheads. Staining is absent in negative control specimen (A), indicating neither spontaneous fluorescence nor nonspecificity of the secondary antibody. The fluorescence is faint in the Ctrl group (B), increases in the Noise group (C, E), and decreases in the NoiseQter group (D, F) at days 1 and 11. Scale bar, 100 μm.