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Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings

Week 3 – The Three-Layered Embryo

Three Germ Layers*

Endoderm – formed from migrating cells that replace the hypoblast

Mesoderm – formed between epiblast and endoderm

Ectoderm – formed from epiblast cells that stay on dorsal surface

*All layers derive from epiblast cells!

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