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Presence of ferric iron in sections from the planum temporale of the temporal lobe. A few pyramidal neurons are stained for iron (A) but the majority of iron staining occurs in a loose network of fibers that occur in all cortical layers (B). These fibers may be myelinated, but they do not correspond to the prominent bundles of myelinated fibers which form the output axons from pyramidal cells in this area and which have been stained with Gallyas's method in (C).
