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Auditory brainstem responses. A, Representative ABR waveforms for 55 dB SPL click from individual Dbh+/−, Dbh−/−, and Dbh+/+ mice. Arrows indicate the first ABR peak. B, Group average thresholds in response to clicks, 8 kHz tones. and 16 kHz tones. Error bars represent mean ± 1 SE.
