nervous system
• mice have defects in the dorsal telencephalic commissures
• all mutants have a complete absence of midline crossing at the most anterior and posterior region
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• about 20% of mice have a small number of callosal fibers in the region above the hippocampal commissure
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• axons are absent in the contralateral cortex or white matter
• the cortical fibers are trapped within Probst bundles
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