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Cross-section of a nerve biopsy specimen from patient 4 exhibiting severe axonal neuropathy. There is loss of myelinated nerve fibres. Some large myelinated fibres show degenerating myelin ovoids. Secondary demyelination is seen in rare nerve fibres. Clusters of Schwann cells without nerve fibres are increased. Resin section, stained with paraphenylene diamine, magnification 115×.
