FN1 and pulmonary fibrosis: Inhaled DMF treatment resulted in resolution of age-dependent established lung fibrosis, as demonstrated by histopathology (Figure 4A; top panels), reduced collagen deposition (Figure 4A; bottom panels), significantly decreased expression levels of fibronectin (Figure 4B,C) and collagen-1α (Figure 4D,E), and decreased lung hydroxyproline levels (Figure 4F) as compared to vehicle-treated and oral DMF treated mice (Figure 4A–F).