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Instilled O-MWCNTs produced significant inflammation in the lungs at day 1. Histopathological findings of pleural (A) and (B) bronchiolar inflammation in rats exposed to 250 μL DM or a single 200 μg dose of O-MWCNTs (C and D, respectively). Panels are bright-field microscopy images of representative responses. Tissues were stained with H & E. Scale bar is 50 μm in panels A and C and 100 μm in panels B and D.
