Jisho

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Noun
1. yolk sac
Wikipedia definition
2. Yolk sacThe yolk sac is a membranous sac attached to an embryo, providing early nourishment in the form of yolk in bony fishes, sharks, reptiles, birds, and primitive mammals. It functions as the developmental circulatory system of the human embryo, before internal circulation begins.
Read “Yolk sac” on English Wikipedia
Read “卵黄嚢” on Japanese Wikipedia
Read “Yolk sac” on DBpedia

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