FIGURE 7.

Superimposed ABR waveforms for Slc4a11^+/+ (left) and Slc4a11^−/− (right) mice (2 ABR replicates/animal). Each cluster of three (Slc4a11^+/+) or two (Slc4a11^−/−) superimposed displays is ordered in decreasing stimulus level intensity (75, 65, and 55 db). The vertical arrow in the upper left marks the 1 ms end of stimulus artifact and actual arrival of sound at the ear. Age groupings are as follows. A, young (Slc4a11^+/+, 115–181 days; Slc4a11^−/−, 151–175 days); B, middle (Slc4a11^+/+, 204–211 days; Slc4a11^−/−, 200–211 days); C, old (Slc4a11^+/+, 398–464 days; Slc4a11^−/−, 386–455 days).