In vivo effect of DPTTS on lung fibrosis in HOCl mice ( n = 8 mice per group). (a) Collagen content in the lungs was measured by the Sircol method. (b) Representative lung sections from mice injected with (1) PBS, (2) DPTTS, (3) HOCl, and (4) HOCl + DPTTS. (H & E staining; magnification × 50; Olympus DP70 Controller). Values are expressed as mean ± SEM of data gained from all mice in the experimental or control groups. *P < 0.05; **P < 0.01.