Noise-induced superoxide production is reduced by Qter treatment. DHE-positive OHCs and SGNs are shown by arrowheads. Spontaneous fluorescence is absent in cochlear tissues (A). The fluorescence is faint in the Ctrl group (B), progressively increases in the Noise group (C, E), and decreases in the NoiseQter group (D, F) at days 1 and 11. Scale bar, 100 μm.