Figure 2: Autometalography silver staining of lungs. Silver localization in lung tissue at the terminal bronchiole alveolar duct junction using autometallography with no background staining. Arrows show localization of silver to the terminal bronchiole alveolar duct junction 7 days post instillation. Silver is particularly associated with bifurcations, and the subepithelial extracellular matrix and adjacent vasculature. Panel A) Naïve; B) Citrate vehicle 1 day; C) Citrate vehicle 7 days; D) AgNP 1 day and E) AgNP 7 days post instillation. Back bar identifies100 μm scaling.