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A demyelinated axon. A cross section of a sural nerve biopsy specimen obtained from a patient with AIDP. A demyelinated axon indicated by an asterisk is surrounded by a space filled with vesicular dissolution of the myelin. The cytoplasm of a macrophage indicated by an arrow is also within the basement membrane tube. Uranyl acetate and lead citrate staining. Scale bar = 1 μm.
