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From head to tail: How cells can behave autonomously during early development
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phys.org

From head to tail: How cells can behave autonomously during early development

We all start our lives as symmetric balls of cells. In humans, during the first few weeks after fertilization, embryonic cells undergo several rounds of division, increasing their mass. Then comes gastrulation, the process that changes everything and establishes our body plan. During gastrulation, the collection of uniform cells that make up the early embryo break symmetry and reorganize into a multi-layered structure with distinct cell types.
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