CDE diet induces both an oval cell response and a response of sinusoidal liver cells. Immunohistochemical stainings of cytokeratin, E-cadherin and M-Pk were compared from normal mice (left panel) and CDE treated mice (right panel). Black arrows indicate ductular accumulation of oval cells. These cells were displayed with a pan specific anti-cytokeratin antibody (A, A'). This antibody additionally detects cells of biliary ducts. An immunohistochemical staining with anti-E-cadherin antibody reliably displays oval cells, but reacts also with biliary cells and additionally with periportal hepatocytes. The anti-M-Pk antibody (Rockland, Table 1) marks oval cells but also biliary cells and cells of hepatic sinusoids. Sinusoidal cells accumulate under CDE conditions (C') PV = portal vein. Bar = 50 μm.