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Gastrulation is a crucial stage in embryonic development during which the blastula (a hollow ball of cells) reorganizes to form the three primary germ layers: the ectoderm, mesoderm, and endoderm. These germ layers will ultimately differentiate into all the tissues and organs of the developing embryo.
In vertebrates, gastrulation involves the invagination of a sheet of cells to form a structure called the primitive streak. Cells then migrate through the primitive streak to form the three germ layers.
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