Cytochochleograms show hair cell loss in mutants.

<p>Cytocochleograms indicate percentage of outer (OHC) and inner (IHC) hair-cell loss as a function of percent distance from the cochlear apex, where 0% distance describes the most apical region of the cochlea and 100% distance describes the most basal region of the cochlea, excluding the cochlear hook. Hair-cell loss is shown for three-week-old <i>trhl</i> homozygotes (n = 5) (<b>A</b>) and heterozygotes (n = 5) (<b>B</b>) and for seven-week-old <i>trhl</i> homozygotes (n = 5) (<b>C</b>) and heterozygotes (n = 5) (<b>D</b>). Data points represent the mean percentage, with error bars indicating standard deviation. There is clear evidence of hair-cell loss to a much greater degree in the homozygous mutants as compared to the heterozygous controls.