Observation of liver fibrosis in transgenic mice. (A) Serum ALT levels. (B) Hydroxyproline content in liver. (C) Col 1A2 mRNA levels measured by real-time quantitative PCR. All samples were collected 48 h after gene transfer and induction with ZnSO4. Values are represented as mean ± SD. *, p < 0.05; **, p < 0.001; compared with other groups; unpaired t-tests.