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Transmission electron micrographs of MSN internalization in alveolar macrophages recovered from lungs at 1 day (a,b) and 7 days (c,d) post-inhalation. The arrows point to the position of the MSN complexes within phagolysosomes of the cell (scale bar: 2 µm: a,c) (scale bar: 0.5 µm, b,d). Mice: n=8 / time-point.
