Portal pressures (mmHg) of sham-operated, PPVL (a), CBDL (b) and CCl4 (c) mice. Data are expressed as mean ± SEM. aP < 0.05 vs. sham-operated or control, bP < 0.05 vs. 1 week CBDL, cP < 0.05 vs. 4 week CCl4. PPVL, partial portal vein ligation; CBDL, common bile duct ligation; CCl4, carbon tetrachloride.