chorioallantois
Pronunciation: kō′rē-ō-ă-lan′tō-is
Definition: Extraembryonic membrane formed by the fusion of the allantois with the serosa or false chorion. In mammalian embryos, it forms the fetal portion of the placenta; in avian embryos, it is fused with the shell.
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Examples: glitazone, GI cocktail, etc.
