Gastrulation.
At gastrulation, a single layer of cells is converted into an outer ectodermal covering, an inner ectodermal tube, and in triploblastic phyla, a middle mesodermal layer. This morphogenesis is driven by motility and directed by cell interactions, some of which involve adhesion and others that involve information transfer.
McClay
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Department of Zoology, Duke University, Durham, North Carolina.
D000595:Amino Acid Sequence; D000818:Animals; D002448:Cell Adhesion; D002450:Cell Communication; D004475:Ectoderm; D005314:Embryonic and Fetal Development; D005775:Gastrula / Q000502:physiology*; D008969:Molecular Sequence Data; D009024:Morphogenesis