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Examples of the ABR waveforms in young and older mice (a) and the ABR thresholds (dBSPL) of CBA/CaJ mice at different ages in response to pure tones (frequency range 4–34 kHz) and auditory clicks (b). Data presented as mean ± SEM; *p < 0.05; **p < 0.01; Student’s t test, comparing against young mice (3–6 months)
