Definition for Yolk sac
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Revision as of 00:42, 26 January 2011 by Bio man (Talk | contribs) (Created page with "An extraembryonic membrane in the amniotic egg that encloses a stockpile of nutrients, in the form of yolk, for the developing embryo.")
An extraembryonic membrane in the amniotic egg that encloses a stockpile of nutrients, in the form of yolk, for the developing embryo.