A turning or folding inwards; an inward fold.
- The head region of the embryo is demarcated anterior to the node by the head fold, an infolding of the blastoderm composed of both ectoderm and endoderm.
- For example, most metazoans go through a developmental stage called a gastrula - a ball of cells with an infolding that later forms the gut.
- In the octopus eye it is formed by an infolding of the surface cells on the head, which become thickened to form eye components.
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