growth/size/body
• visibly smaller than litter mates in 22% of homozygotes showing a more severe phenotype
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hearing/vestibular/ear
• increased ABR thresholds indicate a profound hearing impairment at 18 days in 22% of homozygotes showing a more severe phenotype
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behavior/neurological
• hesitant, wobbly gait in 22% of homozygotes showing a more severe phenotype
• frequent hyperextension of rear limbs in 22% of homozygotes showing a more severe phenotype
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