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Fig. 1 Schematic representation shows fetal circulation. Bright-red
blood vessels carry oxygenated blood, and blue vessels carry deoxygenated
blood. 1 = umbilical vein, 2 = ductus venosus, 3 = foramen ovale, 4 = ductus
arteriosus, 5 = umbilical arteries, 6 = main portal vein, 7 = left portal
vein, 8 = left hepatic vein, 9 = inferior vena cava, 10 = abdominal aorta, 11
= umbilicus, 12 = urinary bladder, 13 = placenta, 14 = liver.