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Fig. 8A. —Schematic drawings of normal development of intrahepatic portal and hepatic venous systems. Drawing shows embryo at 5 weeks' gestation. Vitelline venous plexus is surrounded by liver cords to form hepatic sinusoids. Bilateral umbilical veins (UV) form sinusoids. CV = cardinal vein, HS = hepatic sinusoid, D = duodenum, VV = vitelline vein.