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The amnion of mammalian embryo is derived from
Explanation
Amnion = ectoderm (inside) + mesoderm (outside).
Detailed Solution
The extraembryonic or foetal membranes are amnion, chorion, allantois and yolk sac.
Amnion is formed from mesoderm on the outer side and ectoderm on the inner side.
Chorion is formed from trophoectoderm and mesoderm, whereas allantois and yolk sac membranes have mesoderm on the outer side and endoderm on the inner side.