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noundouble-walled stage of the embryo resulting from invagination of the blastula; the outer layer of cells is the ectoderm and the inner layer differentiates into the mesoderm and endodermtype of:
Definition that contains gastrula
- germ layer (embryology) any of the 3 layers of cells differentiated in embryos following gastrulation
- archenteron central cavity of the gastrula; becomes the intestinal or digestive cavity
- gastrulation the process in which a gastrula develops from a blastula by the inward migration of cells