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OpenStudy (anonymous):
What layer is made up of the chorion amnion and yolk sac? And then what layer is made of ectoderm mesoderm endoderm?
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OpenStudy (blues):
I believe the chorion amnion is mesodermal...
OpenStudy (anonymous):
chorion is formed by extraembryonic mesoderm and the two layers of trophoblast. the amnion is in contact with the Mesoderm.
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