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Tangential section of perfusion-fixed sciatic nerve embedded in epoxy resin of a chicken exposed to a neurotoxic dose (2.5 mg/kg) of phenyl saligenin phosphate (intramuscular) 15 days before it was killed. Several stages of myelinated fiber degeneration are seen, including a swollen pale stained axon (black arrow) and a fiber undergoing degradation (Wallerian-type) within a phagocyte (white arrow). Toluidine blue and safranin stain.
