Definitions for umbilical vesicle
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Princeton's WordNet
yolk sac, vitelline sac, umbilical vesicle, vesicula umbilicus(noun)
membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
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"umbilical vesicle." Definitions.net. STANDS4 LLC, 2013. Web. 19 Jun 2013. <http://www.definitions.net/definition/umbilical vesicle>.

