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FIG 3. Light microscopy of the sural nerve specimen (Toluidin blue stain, semi-thin section) in a patient with CMT I and atypical clinical symptoms (case 3).
Almost all fibers show "onion bulbs" (black arrowhead), with an absence of myelinated fibers, indicating active demyelination. Clusters of regenerating fibers are indicated by thin black arrow and collagen hypertrophy by large black arrow.
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