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Micrographs of lung tissue from a rat exposed to SWCNTs at 3, 7, 30, 90, 180, 365 and 754 days post-instillation. After the rats were sacrificed, the lung tissues were fixed in 4% buffered paraformaldehyde, followed by embedding in paraffin, and the sections were stained with hematoxylin and eosin.
