hearing/vestibular/ear
• while mounts of inner ears show otoconial deficiencies that are likely due to displacement of the otolithic membrane
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• at wean age homozygotes have severe hearing impairment as assessed by auditory-evoked brainstem response and are deaf by 70 days of age
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behavior/neurological
• homozygotes swim tilted to one side in circles usually just below the surface of the water
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