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. 2023 Jun 30;23:250. doi: 10.1186/s12883-023-03260-0

Fig. 2.

Fig. 2

Sural nerve pathology of patient 1. Toluidine-stained semithin sections showed severe decreased density of myelinated fibers (A). Regenerating clusters (arrow), pseudo-onion bulbs (arrowhead) can be seen (B). Ultrastructure examination also showed regenerating clusters (C, arrow) and numerous unmyelinated collateral sprouts forming a pseudo-onion bulb (D)