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Cochlear thresholds are normal in BK−/−, at both 6 and 15 wk of age, and for both distortion product otoacoustic emissions (DPOAEs; A) and auditory brain-stem responses (ABRs; B). Means (±SE) are shown; numbers of ears in each DPOAE group were: at 6 wk, 33 BK+/+ and 24 BK−/−; at 15 wk, 8 BK+/+ and 8 BK−/−. Key in B applies to both panels. SPL, sound-pressure level.
