Ag NWs and other silver species in lung tissues at Day 7. Images are of autometallography -stained slides in the terminal bronchioles [(TB) left], perivascular (blood vessel) region [(BV) middle], and pleura (right). Tissues were obtained 7 days post instillation of sham control (A-C), S-Ag NWs (D-F), or L-Ag NWs (G-I) at 1.0 ml/kg. Ag NWs are indicated by blue arrows. Panels are Brightfield microscopy images. Scale bar is 25 μm.