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Definisi 'yolk sac'
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English to English noun
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membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional |  | source: wordnet30
| 2 |
membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo | | source: wordnet30
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