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单词 amniotic fold
释义 amniotic fold
noun
: one of the folds consisting of ectoderm and the outer layer of mesoderm that arises from the extraembryonic blastoderm first at the head, then at the tail, and finally on each side and that gives rise to the amnion and much of the chorion
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更新时间:2024/9/23 2:36:33