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Transmission electron microscopy images taken from ALS a) primary motor, (b) anterior prefrontal, and (c) primary visual cortices. Images were taken at a magnification of x7700 for all tissues. The myelin sheaths surrounding axons in the PMC are delaminated and unraveled as compared to anterior prefrontal and primary visual cortices axons. Scale bar has been calibrated to 1 μm in length.
