Fig. 2

Distribution of GaP NWs in the mouse lung. Enhanced darkfield microscopy images of lung tissue 1 day (a, b), 28 days (c, d) and 3 months (e, f) after intratracheal instillation. Single NWs (white) and bundles of NWs in the alveolar region were phagocytized by macrophages (arrows) or located in or at alveolar walls (arrowheads). b) vehicle control. d) and f) correspond to the marked regions in c) and e) at higher magnification. Hematoxylin and eosin stain; scale bars 20 μm