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Synaptic ribbon counts in six cochlear regions of control and noise-exposed ears show synaptic loss throughout the basal half of the cochlea. Mean numbers (±SEMs) of synaptic ribbons per IHC were computed from confocal z-stacks such as those in Figure 2 from control ears (n = 11) and exposed ears at 6 cochlear locations and 4 postexposure times: 1 d (n = 6), 3 d (n = 5), and 8 weeks (n = 6).
