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Presence of gold nanoparticles in Kupffer cells of the liver. Marker indicates 200 nm (top panel). Positive identification of the element gold in the observed nanostructures by EDX analysis. Area 1: a larger cluster of Au particles (10 nm; bottom left panel). Area 2: an area containing 2 Au particles (bottom right panel). In the surrounding areas, Os and Pb staining is present.
