Objective To observe the changes of the expression of matrix metalloproteinase 2 (MMP 2) and the activity of MMP 2 in the early stage of liver fibrosis.

• 目的 研究猪胆汁性肝纤维化时基质金属蛋白酶 2 (MMP 2 )表达及活性改变 ,分析其在肝纤维化初始阶段的作用。