hearing/vestibular/ear
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• there are slightly increased numbers of inner hair cells in the middle region of E18.5 embryos
• in the apex region, cochleae had many extra hair cells (nearly two rows of inner hair cells)
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• adult mice exhibit short and disorganized stereocilia bundles
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• some of the outer hair cell bundles are missing in the middle and apical regions
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• nine of 22 mice show shortened or/and malformed cochlea at E18.5
• one ear retained only about one-half turn and another ear retained about three-quarter turn
• majority of the affected ears lost around one-half turn of the cochlea
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• there is a slight but significant reduction in the number of hair cells found in the sacculle of mice (1508 vs. 1705 in wild-type)
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• 2 mice of 22 mice at E18.5 have truncated posterior semicircular canals
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• 2 of 22 mice at E18.5 have truncated ampulla, one posteriorly and one anteriorly
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• 2 mice of 22 mice at E18.5 have truncated anterior semicircular canals
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• 5 of 22 mice at E18.5 have malformed cochlea
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• 4 mice of 22 mice at E18.5 have a truncated endolymphatic duct
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nervous system
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• there are slightly increased numbers of inner hair cells in the middle region of E18.5 embryos
• in the apex region, cochleae had many extra hair cells (nearly two rows of inner hair cells)
|
|
• adult mice exhibit short and disorganized stereocilia bundles
|
|
• some of the outer hair cell bundles are missing in the middle and apical regions
|
|
• there is a slight but significant reduction in the number of hair cells found in the sacculle of mice (1508 vs. 1705 in wild-type)
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