nervous system
• corticospinal neuron (CSN) numbers are reduced ~36%
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• lipofuscin autofluorescence is prominent in the neocortex, entorhinal cortex, basal nucleus of Meynert and hippocampus, indicative of degenerative processes
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cellular
• in mutants, corticospinal neurons are resistant to lesion-induced cell death whereas ~40% of wild-type CSN die after CSN deafferentation at 4 months of age
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