ABR threshold at frequencies ranging from 3 kHz to 48 kHz for individual mice and mean data. Wide band noise (WBN) thresholds were determined as well. a) Thresholds for each mouse in both groups Y and MA show that although the majority of the MA values are higher than Y, some of the thresholds still overlap between the two groups. b) Averaged threshold values clearly show that the Y group has thresholds that are approximately 10 dB lower than the MA group, especially at 12, 16, 20 and 24 kHz. Statistical tests: ANOVA followed by Bonferroni; *p<0.05, **p<0.01, ***p<0.001, ****p<0.0001.