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skos:definition |
MSH: An extra-embryonic membranous sac derived from the YOLK SAC of REPTILES; BIRDS; and MAMMALS. It lies between two other extra-embryonic membranes, the AMNION and the CHORION. The allantois serves to store urinary wastes and mediate exchange of gas and nutrients for the developing embryo.,NCI: An extraembryonic membrane in the form of a sac. It collects waste from the embryo.
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