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- an embryonic membrane of higher vertebrates Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
- A saclike outgrowth from the ventral surface of the posterior part of the embryonic gut and membrane in reptiles, birds, and mammals that functions as an embryonic urinary bladder or as a respiratory extension of the hindgut, carrying blood vessels to and from the placenta. Source: Curtis, Helena. 1968. Biology. New York, NY. Worth Publishers
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