nervous system
• accumulation of smooth endoplasmic reticulum in nodal-paranodal regions
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• septate junction septa in sciatic nerves become more diffuse, most lacking electron dense granules at 1 month of age
• septa in sciatic nerves are diffuse and fuzzy at 3 months
• axolemma becomes detached from the myelin loops where septa are missing in the spinal cord
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