Gastrulation Process

Gastrulation is a phase early in the embryonic development of most animals , during which the single-layered blastula is reorganized into a multilayered structure known as the gastrula . Before gastrulation, the embryo is a continuous epithelial sheet of cells; by the end of gastrulation, the embryo has begun differentiation to establish distinct cell lineages, set up the basic axes of the body (e.g. dorsal-ventral , anterior-posterior ), and internalized one or more cell types including the prospective gut.


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