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(a) Hematoxylin and eosin stain, 400x magnification, calibration bar is 0.1 mm. Significantly decreased amount of myelinated fibers without evidence of digestion chambers or inflammation. (b) Toluidine blue stain, 400x magnification, calibration bar is 0.1 mm. Severe (>95 %) loss of myelinated axons without onion bulbs or regenerating clusters
