nervous system
• heterozygotes exhibit abnormal axonal navigation of the inner ear efferent neurons
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• heterozygotes display aberrant inner ear efferent axonal projections, such as projections of fibers through the facial branchial motor nerve root, and caudal extension of efferent axons along the floor plate midline into r5 and occasionally into r6, not seen in wild-type littermates
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cellular
• heterozygotes exhibit abnormal axonal navigation of the inner ear efferent neurons
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