CXXC5 and pulmonary fibrosis: The BLM+Ad-GFP group suffered from more severe alveolar structural damage (Figure 1(a)) and had more collagen fibers (Figure 1(b)) and higher pulmonary fibrosis score (Figure 1(c)) and hydroxyproline (Figure 1(d)) content than the BLM+Ad-CXXC5 group, and the difference was statistically significant (P < 0.05).