Fig. 4. (A) Drawing showing the four 2500 µm² regions of the saccular macula where hair bundles were quantified (see Materials and methods for details). (B) Numbers of hair bundles in each saccular region by day; day 0 is immediately following 48 h of noise exposure; B, baseline animals that were killed prior to the experiment; C, control animals that were held in the experimental set-up for 48 h without the sound stimulus. Values are means ± s.e.m.; N=6 per data point for controls and days 0-8; N=2 for baseline. Asterisks indicate significant differences from baselines and controls (P<0.05).