Figure 1 In newborn BPD mice, RAC value and SOD activity were lower and while MDA level was higher. (A) Changes in body weights of BPD newborn mice on the 7th day and the 14th day of BPD modeling, n=5. (B) HE staining showed the variance in lung tissue structure on the 7th day and the 14th day of BPD modeling, with the black arrows indicating alveolar fusion and the red ones indicating alveolar septum, ×400, n=5. (C) RAC was lower in BPD mice on the 7th day and the 14th day of BPD modeling, n=5. (D) Decreased SOD activity and increased MDA level were found in BPD mice, n=3. Two-way ANOVA and Tukey’s multiple comparisons test were applied to determine statistical significance. * p<0.05, ** p<0.01. BPD – bronchopulmonary dysplasia; RAC – radial alveolar counts; SOD – superoxide dismutase; MDA – malondialdehyde; HE – hematoxylin-eosin; ANOVA – analysis of variance.