Invagination is the process by which a portion of the cell membrane folds inward to form a pocket or pouch, which can lead to the formation of structures such as the gut during embryonic development. This mechanism is crucial in shaping the embryo and establishing the three primary germ layers: ectoderm, mesoderm, and endoderm. Invagination is a key event during gastrulation, allowing for the internalization of cells that will give rise to various tissues and organs.
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