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Ultrastructure of an inclusion (arrow) within a neocortical neuron seen at low (A) and intermediate (B) power. These aggregates of filaments were irregularly shaped to oblong or needle-shaped and formed parallel arrays (inset) with a periodicity of 11.6nm (arrowheads); the 4.36nm diameter of the filaments places them in the size range of actin microfilaments. Original magnification: A, ×26,760; B, ×76,210; inset, ×171,975.
