Nouns

(n)yolk sac, vitelline sac, umbilical vesicle, vesicula umbilicusmembranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
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(n)yolk sacmembranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo
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