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A trilaminar embryo is an early stage in the development of triploblastic organisms, which include humans and many other animals. It is an embryo which exists as three different germ layers - the ectoderm, the mesoderm and the endoderm. These layers are arranged on top of each other like a stack of paper, giving rise to the name trilaminar, or "three-layered".
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"Trilaminar embryo"