Figure 5. Changes of apoptosis percentages in the lung. (A) Apoptosis in the lung at 21 days of the experiment. (B) Apoptosis in the lung at 42 days. (C) Percentage of apoptosis in the lung. Data are presented with the mean± standard deviation (n=8). *p < 0.05, compared with the control group; **p < 0.01, compared with the control group.