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Light micrographs of paraffin sections of nasal cavities from iron–soot exposed mice, showing the lamina propria region of olfactory mucosa. (A) The plane of section is roughly parallel to the fascicle. (B) The plane of section cuts across several nerve fascicles at an oblique angle, producing an elliptical cross section. Arrows indicate Prussian blue-positive olfactory nerve fibers, demonstrating the presence of ferric iron. Tissues are counterstained with neutral red.
