Figure 2.

The histological changes of livers from control and DEN-treated rats. (A) the normal liver tissue from rat of control group; (B-L) tissures from rats by DEN-treated: (B) non-special injury of liver at the 6^th week; (C) liver fibrosis at the 8^th week; (D) liver cirrhosis at the 10^th week; (E) liver cirrhosis rat at the 12^th week; (F) dysplasia nodules at the 14^th week; (G) liver carcinoma at the 16^th week; (H) liver carcinoma at the 20^th week; (I) tumor embolism in blood vessel at the 20^th week; (J) the metastasis mass in the abdormainal cavity at the 20^th week; (K) lung metastasis at the 20^th week; (L) lung tissure of normal rat.