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. 2022 Apr 13;12:6181. doi: 10.1038/s41598-022-10220-0

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Nerve biopsy of patient carrying the p.K357E variant. (A) Sural nerve, semithin section, toluidine blue (400× magnification): several onion bulbs (arrows). (B) Electron micrograph; transverse section. One myelinated axon is surrounded by concentric proliferation of Schwann cells. Bar = 1 µm.