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Chorion
The cellular, outermost extraembryonic membrane, composed of trophoblast lined with mesoderm. It develops villi about two weeks after fertilization. Villi are the threadlike projections growing in tufts on the external surface of the chorion. At three weeks, it is vascularized by allantoic vessels.
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- Part of Speech: noun
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- Industry/Domain: Anatomy
- Category: Developmental anatomy
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