Identification of the ENU-induced hearing loss pedigree MPC169, subsequently named clarinet. ABR phenotyping of pedigree Muta-Ped-C3PDE-169 at 3-months of age identified 8 mice with elevated hearing thresholds (red triangles) compared to their normal hearing colony mates (n=61, black triangles). Indeed, all eight affected mice were found to not respond to the highest intensity stimulus (90 dB SPL) at the three frequencies tested, or the click stimulus, and so their thresholds are shown as 95 dB SPL. 