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                                                                                            ž The yolk sac produces alpha-fetoprotein and plays an important role in angiogenesis and hematopoiesis during early embryologic development.
ž It is connected to the embryo by the vitelline duct, also referred to as the omphalomesenteric duct, which contains one artery and one vein.
¡ The vitelline duct contains one artery and one vein, and transports vital nutrients to the developing embryo.
ž It may be visualized during a first-trimester sonographic examination.
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